WO2019022123A1 - Motor - Google Patents

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Publication number
WO2019022123A1
WO2019022123A1 PCT/JP2018/027854 JP2018027854W WO2019022123A1 WO 2019022123 A1 WO2019022123 A1 WO 2019022123A1 JP 2018027854 W JP2018027854 W JP 2018027854W WO 2019022123 A1 WO2019022123 A1 WO 2019022123A1
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WO
WIPO (PCT)
Prior art keywords
stator
inverter
cooling flow
cooling
housing
Prior art date
Application number
PCT/JP2018/027854
Other languages
French (fr)
Japanese (ja)
Inventor
佳久 奥畑
国博 梶田
美香 小長谷
陽介 伊東
Original Assignee
日本電産トーソク株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電産トーソク株式会社 filed Critical 日本電産トーソク株式会社
Priority to CN201890001000.5U priority Critical patent/CN212323923U/en
Publication of WO2019022123A1 publication Critical patent/WO2019022123A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits

Definitions

  • the present invention relates to a motor.
  • a motor is known in which a rotor and a stator and an inverter device are housed in a housing and integrated.
  • Japanese Patent Application Laid-Open No. 2015-104257 describes a configuration in which a rotor, a stator, and an inverter device are disposed on a central axis in a housing.
  • stator and the inverter device can be efficiently cooled.
  • a method of cooling the stator and the inverter device it is conceivable to provide a cooling flow passage through which the refrigerant flows in the housing.
  • simply providing the cooling flow path in the housing may not provide sufficient cooling efficiency of the stator and the inverter device.
  • An object of the present invention is to provide a motor having a structure capable of improving the cooling efficiency of a stator and an inverter unit by a cooling flow channel in view of the above-mentioned circumstances.
  • a rotor having a motor shaft disposed along a central axis extending in one direction, a stator opposed to the rotor via a gap in the radial direction, and the stator electrically An inverter unit to be connected, and a housing having a stator accommodating unit for accommodating the stator and an inverter accommodating unit for accommodating the inverter unit, the inverter accommodating unit being located radially outward of the stator accommodating unit
  • the housing has a cylindrical peripheral wall portion surrounding the rotor and the stator on the radially outer side of the rotor and the stator, and is a single member, and the peripheral wall portion is a cooling channel, and A partition wall portion for partitioning the stator housing portion and the inverter housing portion; and the cooling flow path includes an inlet through which a refrigerant flows and the cooling flow path It has an outlet through which the medium flows out, and extends in the circumferential direction, at least a part of the cooling channel being provided
  • a motor having a structure capable of improving the cooling efficiency of the stator and the inverter unit by the cooling flow passage is provided.
  • FIG. 1 is a perspective view showing the motor of the first embodiment.
  • FIG. 2 is a view showing the motor of the first embodiment, and is a cross-sectional view taken along the line II-II in FIG.
  • FIG. 3 is a view showing the motor of the first embodiment, and is a cross-sectional view taken along the line III-III in FIG.
  • FIG. 4 is a top view of the motor of the first embodiment.
  • FIG. 5 is a perspective view showing the cooling unit of the first embodiment.
  • FIG. 6 is a cross-sectional view showing a part of the motor of the first embodiment.
  • FIG. 7 is a cross-sectional view showing a part of a motor according to a modification of the first embodiment.
  • FIG. 8 is a perspective view showing a cooling unit of the second embodiment.
  • the Z-axis direction shown in each drawing is the vertical direction Z with the positive side as the upper side and the negative side as the lower side.
  • the Y-axis direction is a direction parallel to the central axis J extending in one direction shown in each drawing and a direction orthogonal to the vertical direction Z.
  • a direction parallel to the central axis J that is, the Y-axis direction is referred to as “axial direction Y”.
  • the positive side in the axial direction Y is referred to as “axial one side”
  • the negative side in the axial direction Y is referred to as “axial other side”.
  • the X-axis direction shown in each drawing is a direction orthogonal to both the axial direction Y and the vertical direction Z.
  • the X-axis direction is referred to as "width direction X”. Further, the positive side in the width direction X is referred to as “one side in the width direction”, and the negative side in the width direction X is referred to as the other side in the width direction.
  • the vertical direction Z corresponds to a predetermined direction.
  • a radial direction centered on the central axis J is simply referred to as “radial direction”, and a circumferential direction centered on the central axis J is simply referred to as “circumferential direction ⁇ ”.
  • the side advancing in the counterclockwise direction as viewed from the other side in the axial direction to the one side in the axial direction that is, the side opposite to the advancing side of the arrow showing the circumferential direction ⁇ in the figure
  • the side that travels clockwise, that is, the side on which the arrow indicating the circumferential direction ⁇ in the drawing proceeds, is referred to as the “other side in the circumferential direction”.
  • the motor 1 includes a housing 10, a lid 11, a cover member 12, a sensor cover 13, and a motor shaft 21 disposed along a central axis J. It has a rotor 20, a stator 30, an inverter unit 50, a connector portion 18, and a rotation detection portion 70.
  • the housing 10 accommodates the rotor 20, the stator 30, the rotation detection unit 70, and the inverter unit 50.
  • the housing 10 is a single member.
  • the housing 10 is made, for example, by sand casting.
  • the housing 10 has a peripheral wall portion 10b, a bottom wall portion 10a, a bearing holding portion 10c, and a rectangular tube portion 10e.
  • the peripheral wall portion 10 b has a cylindrical shape that surrounds the rotor 20 and the stator 30 on the radially outer side of the rotor 20 and the stator 30.
  • the peripheral wall portion 10 b is substantially cylindrical with the central axis J as a center.
  • the peripheral wall portion 10 b is open to one side in the axial direction.
  • the peripheral wall portion 10 b has a cooling portion 60 that cools the stator 30 and the inverter unit 50.
  • the bottom wall portion 10a is provided at the other end of the circumferential wall portion 10b in the axial direction.
  • the bottom wall portion 10a closes the other side of the circumferential wall portion 10b in the axial direction.
  • the bottom wall portion 10a has a sensor housing portion 10g penetrating the bottom wall portion 10a in the axial direction Y.
  • the sensor storage portion 10 g has, for example, a circular shape centered on the central axis J when viewed along the axial direction Y.
  • the bottom housing portion 10 a and the peripheral wall portion 10 b constitute a stator housing portion 14. That is, the housing 10 has a bottomed cylindrical stator housing portion 14 having a peripheral wall portion 10 b and a bottom wall portion 10 a.
  • the bearing holding portion 10c has a cylindrical shape that protrudes in the axial direction from the peripheral edge portion of the sensor accommodating portion 10g on the surface on the one side in the axial direction of the bottom wall portion 10a.
  • the bearing holder 10 c holds a bearing that supports the motor shaft 21 on the other side in the axial direction with respect to the rotor core 22 described later.
  • the rectangular tube portion 10 e has a rectangular tube shape extending upward from the peripheral wall portion 10 b.
  • the rectangular tube portion 10e opens upward.
  • the rectangular tube portion 10 e has, for example, a square tube shape.
  • the wall part on the other side in the axial direction is connected to the upper end part of the bottom wall part 10 a.
  • the square tube portion 10 e has a through hole 10 f penetrating in the axial direction Y a wall portion on one side in the axial direction among wall portions constituting the square tube portion 10 e.
  • the lower end portion of the through hole 10 f is connected to the opening on one side in the axial direction of the peripheral wall portion 10 b.
  • An inverter accommodating portion 15 is configured by the rectangular tube portion 10 e and the peripheral wall portion 10 b. That is, the housing 10 has an inverter accommodating portion 15.
  • the inverter accommodating portion 15 is located radially outside the stator accommodating portion 14. In the present embodiment, the inverter accommodating portion 15 is located above the stator accommodating portion 14 in the vertical direction Z orthogonal to the axial direction Y.
  • the stator housing portion 14 and the inverter housing portion 15 are partitioned in the vertical direction Z by the partition wall portion 10 d.
  • the partition wall portion 10d is an upper portion of the peripheral wall portion 10b. That is, the peripheral wall portion 10 b has a partition wall portion 10 d that divides the stator accommodation portion 14 and the inverter accommodation portion 15.
  • the dimension in the vertical direction Z of the partition wall portion 10 d becomes larger as it goes away from the central axis J in the width direction X orthogonal to both the axial direction Y and the vertical direction Z. That is, the dimension in the vertical direction Z of the partition wall portion 10d is smallest at the central portion where the position in the width direction X is the same as the central axis J, and increases as moving away from the central portion on both sides in the width direction X.
  • the lid 11 shown in FIG. 2 has a plate shape whose plate surface is orthogonal to the vertical direction Z.
  • the lid portion 11 is fixed to the upper end portion of the rectangular tube portion 10 e.
  • the lid 11 closes the upper opening of the rectangular tube 10 e.
  • illustration of the cover part 11 is abbreviate
  • the cover member 12 has a plate shape whose plate surface is orthogonal to the axial direction Y.
  • the cover member 12 is fixed to a surface on one side in the axial direction of the peripheral wall portion 10b and the rectangular tube portion 10e.
  • the cover member 12 closes the opening on one axial side of the peripheral wall portion 10b and the through hole 10f.
  • the cover member 12 has an output shaft hole 12 a that penetrates the cover member 12 in the axial direction Y.
  • the output shaft hole 12a has, for example, a circular shape passing through the central axis J.
  • the cover member 12 has a bearing holding portion 12b projecting to the other axial side from the peripheral edge portion of the output shaft hole 12a in the surface on the other axial side of the cover member 12.
  • the bearing holding portion 12 b holds a bearing that supports the motor shaft 21 on one side in the axial direction with respect to a rotor core 22 described later.
  • the sensor cover 13 is fixed to the other surface of the bottom wall portion 10 a in the axial direction.
  • the sensor cover 13 covers and closes the opening on the other side in the axial direction of the sensor housing portion 10g.
  • the sensor cover 13 covers the rotation detection unit 70 from the other side in the axial direction.
  • the rotor 20 has a motor shaft 21, a rotor core 22, a magnet 23, a first end plate 24 and a second end plate 25.
  • the motor shaft 21 is rotatably supported by bearings at axially opposite portions. The end of the motor shaft 21 on the one side in the axial direction protrudes from the opening on the one side in the axial direction of the peripheral wall portion 10 b toward the one side in the axial direction. An end of the motor shaft 21 on one side in the axial direction passes through the output shaft hole 12 a and protrudes to one side in the axial direction with respect to the cover member 12. The other axial end of the motor shaft 21 is inserted into the sensor housing 10g.
  • the rotor core 22 is fixed to the outer peripheral surface of the motor shaft 21.
  • the magnet 23 is inserted into a hole passing through the rotor core 22 provided in the rotor core 22 in the axial direction Y.
  • the first end plate 24 and the second end plate 25 are in the form of a radially expanding annular plate.
  • the first end plate 24 and the second end plate 25 sandwich the rotor core 22 in the axial direction Y while in contact with the rotor core 22.
  • the first end plate 24 and the second end plate 25 press the magnet 23 inserted into the hole of the rotor core 22 from both sides in the axial direction.
  • the stator 30 faces the rotor 20 in the radial direction via a gap.
  • the stator 30 has a stator core 31 and a plurality of coils 32 mounted on the stator core 31.
  • the stator core 31 has an annular shape centered on the central axis J.
  • the outer peripheral surface of the stator core 31 is fixed to the inner peripheral surface of the peripheral wall 10b.
  • the stator core 31 faces the radially outer side of the rotor core 22 via a gap.
  • the inverter unit 50 controls the power supplied to the stator 30.
  • the inverter unit 50 includes an inverter unit 51 and a capacitor unit 52. That is, the motor 1 includes an inverter unit 51 and a capacitor unit 52.
  • the inverter unit 51 is accommodated in the inverter accommodation unit 15.
  • the inverter unit 51 includes a first circuit board 51 a and a second circuit board 51 b as circuit boards.
  • the first circuit board 51 a and the second circuit board 51 b have a plate shape whose plate surface is orthogonal to the vertical direction Z.
  • the second circuit board 51b is spaced apart above the first circuit board 51a.
  • the first circuit board 51a and the second circuit board 51b are electrically connected.
  • the coil wire 32 a is connected to the first circuit board 51 a via the connector terminal 53.
  • the inverter unit 51 is electrically connected to the stator 30.
  • the capacitor portion 52 is in the shape of a rectangular solid long in the width direction X.
  • Capacitor portion 52 is accommodated in inverter accommodating portion 15.
  • the capacitor unit 52 is disposed on the other side of the inverter unit 51 in the axial direction. That is, in the inverter accommodating portion 15, the inverter portion 51 and the capacitor portion 52 are arranged side by side in the axial direction Y.
  • the capacitor unit 52 is electrically connected to the inverter unit 51.
  • the capacitor portion 52 is fixed to the upper surface of the partition wall portion 10 d. Condenser part 52 contacts partition wall part 10d.
  • the connector portion 18 is provided on the other surface of the rectangular tube portion 10 e in the width direction.
  • An external power supply (not shown) is connected to the connector portion 18. Power is supplied to the inverter unit 50 from an external power supply connected to the connector unit 18.
  • the rotation detection unit 70 detects the rotation of the rotor 20.
  • the rotation detection unit 70 is, for example, a VR (Variable Reluctance) resolver.
  • the rotation detection unit 70 is accommodated in the sensor accommodation unit 10 g. That is, the rotation detection unit 70 is disposed on the bottom wall portion 10a.
  • the rotation detection unit 70 includes a detection target unit 71 and a sensor unit 72.
  • the to-be-detected part 71 is annular shaped extended in the circumferential direction ⁇ .
  • the to-be-detected part 71 is fitted and fixed to the motor shaft 21.
  • the to-be-detected part 71 is made of magnetic material.
  • the sensor unit 72 has an annular shape surrounding the outside in the radial direction of the detection target 71.
  • the sensor unit 72 is fitted to the sensor storage unit 10g.
  • the sensor unit 72 is supported by the sensor cover 13 from the other side in the axial direction. That is, the sensor cover 13 supports the rotation detection unit 70 from the other side in the axial direction.
  • the sensor unit 72 has a plurality of coils along the circumferential direction ⁇ .
  • the motor 1 further includes a sensor wire that electrically connects the rotation detection unit 70 and the inverter unit 51.
  • One end of the sensor wiring is connected to the detected portion 71.
  • the sensor wiring is routed from the detected portion 71 to the inside of the inverter accommodating portion 15 through a through hole which penetrates the inside of the bottom wall portion 10a and the partition wall portion 10d in the radial direction.
  • the other end of the sensor wiring is connected to, for example, the first circuit board 51a.
  • the rotation detection unit 70 detects the rotation of the motor shaft 21 and detects the rotation of the rotor 20.
  • the rotation information of the rotor 20 detected by the rotation detection unit 70 is sent to the inverter unit 51 via the sensor wiring.
  • the cooling unit 60 has a cooling channel 61. That is, the peripheral wall portion 10 b has the cooling flow passage 61.
  • the cooling unit 60 is configured of only one cooling channel 61.
  • the internal space of the cooling unit 60 is shown as a three-dimensional shape.
  • a refrigerant flows in the cooling channel 61.
  • the refrigerant is not particularly limited as long as it is a fluid that can cool the stator 30 and the inverter unit 51.
  • the refrigerant may be water, a liquid other than water, or a gas.
  • the cooling channel 61 extends in the circumferential direction ⁇ .
  • the cooling channel 61 has a channel body 61a, an inlet 61b, and an outlet 61c.
  • the flow path main body portion 61 a has a circular arc shape which is wide in the axial direction Y and extends in the circumferential direction ⁇ . As shown in FIG. 3, the flow path main body portion 61a is provided on the peripheral wall portion 10b along the circumferential direction ⁇ substantially from the other side in the width direction of the peripheral wall portion 10b.
  • the central angle ⁇ of the flow passage main portion 61a is larger than 180 °.
  • the cooling flow passage 61 is in the shape of a circular arc having a central angle ⁇ larger than 180 °.
  • the cooling channel 61 has a C-shape opening on the other side in the width direction.
  • the inflow port 61 b is located at the center of the axial direction Y at the end on one circumferential side of the cooling channel 61.
  • the inflow port 61b protrudes to the other side in the width direction from an end on one side in the circumferential direction of the flow path main portion 61a.
  • the refrigerant flows into the inflow port 61b.
  • the cross-sectional shape orthogonal to the width direction X of the inflow port 61b is, for example, a circular shape.
  • the inflow pipe 16 is connected to the inflow port 61 b.
  • the inflow pipe 16 is inserted into a hole provided in the housing 10.
  • the inflow pipe 16 protrudes from the housing 10 to the other side in the width direction.
  • the outlet 61 c is located at the center in the axial direction Y at the other circumferential end of the cooling channel 61.
  • the outflow port 61c protrudes from the end on the other side in the circumferential direction of the flow path main portion 61a to the other side in the width direction.
  • the refrigerant flows out from the outlet 61c.
  • the cross-sectional shape orthogonal to the width direction X of the outflow port 61c is, for example, a circular shape.
  • the shape of the outlet 61c is similar to the shape of the inlet 61b. As shown in FIG. 5, the inlet 61 b and the outlet 61 c are disposed at the same position in the axial direction Y.
  • the inlet 61 b and the outlet 61 c are spaced apart in the vertical direction Z.
  • the outlet pipe 17 is connected to the outlet 61 c.
  • the outflow pipe 17 is inserted into a hole provided in the housing 10.
  • the outflow pipe 17 projects from the housing 10 to the other side in the width direction.
  • the inflow pipe 16 and the outflow pipe 17 are disposed at the same position in the axial direction Y.
  • the inflow pipe 16 and the outflow pipe 17 are spaced in the vertical direction Z from each other.
  • the refrigerant flowing through the cooling flow passage 61 flows only in one direction in the circumferential direction ⁇ . That is, in the present embodiment, the refrigerant flowing in the cooling flow passage 61 flows only from one circumferential side to the other circumferential side, and does not flow from the other circumferential side to the circumferential one side. Therefore, it is easy to circulate the refrigerant in the cooling flow passage 61 as compared to the case where a plurality of cooling flow passages in which the flow directions of the refrigerant flow are different from each other.
  • the refrigerant flows only in one direction in the circumferential direction ⁇ means that the vector component along the circumferential direction ⁇ among vector components in the moving direction of the refrigerant has one direction in the circumferential direction ⁇ . Including only cases. That is, if the position of the refrigerant moves in one direction in the circumferential direction ⁇ , the flow direction of the refrigerant as a whole may be inclined with respect to the circumferential direction ⁇ .
  • the stator accommodating portion 14 and the inverter accommodating portion 15 partitioned by the partition wall portion 10 d can be cooled by the refrigerant flowing through the cooling flow passage 61, and the stator 30 and the inverter accommodating portion 15 accommodated in the stator accommodating portion 14. Can be cooled.
  • the refrigerant having flowed into the cooling flow passage 61 is the upper end of the peripheral wall 10b, that is, the partition wall 10d, the one end of the peripheral wall 10b in the width direction, and the lower end of the peripheral wall 10b Flow through in order. Therefore, the refrigerant whose temperature is relatively low immediately after flowing into the cooling channel 61 from the inflow port 61 b can flow to the partition wall portion 10 d, and the inverter portion 51 can be cooled. This makes it easier to cool the inverter unit 51.
  • the heat generation of the inverter unit 51 is particularly likely to be large, and thus the motor 1 can be cooled more preferably by cooling the inverter unit 51 easily.
  • a portion provided in the partition wall portion 10 d in the cooling flow passage 61 is a single layer flow passage between the stator accommodation portion 14 and the inverter portion 51 in the radial direction. Therefore, the configuration of the cooling flow channel 61 can be simplified as compared with the case where the flow channels of a plurality of layers are provided side by side in the radial direction. As a result, both the stator 30 and the inverter unit 51 can be cooled by the single layer cooling flow passage 61, which is efficient. Further, the dimension in the radial direction of the partition wall portion 10d can be easily reduced, and the motor 1 can be easily miniaturized.
  • the cooling flow passage 61 extends in the circumferential direction ⁇ , for example, the cooling flow passage 61 can easily surround the stator 30 and the stator 30 can be cooled more easily than when the cooling flow passage extends in the axial direction Y.
  • the motor 1 having a structure capable of improving the cooling efficiency of the stator 30 and the inverter unit 51 by the cooling flow passage 61 can be obtained.
  • a channel is a channel in a single layer in a part
  • the portion of the cooling passage 61 provided between the stator accommodation portion 14 and the inverter portion 51 in the radial direction is only one continuous portion.
  • only one cooling channel 61 is provided and extends in the circumferential direction ⁇ . Therefore, for example, the cooling channel 61 can be easily manufactured as compared with the case where the cooling channel is formed in a wave shape. Further, for example, in the case where the cooling flow path is formed in a wave shape, the refrigerant does not flow between the flow path portions aligned in the waveform, so it may be difficult to sufficiently increase the area of the cooling flow path.
  • the cooling flow passage 61 is a single flow passage extending in the circumferential direction ⁇ , the area of the cooling flow passage 61 can be easily increased, and the cooling flow passage 61 can be cooled. It is easy to enlarge the range.
  • the cooling channel 61 is in the shape of a circular arc having a central angle ⁇ larger than 180 °. Therefore, it is easy to surround the stator 30 by the cooling flow passage 61, and the stator 30 can be cooled more.
  • the condenser portion 52 accommodated in the inverter accommodating portion 15 can also be cooled by the cooling flow passage 61.
  • three parts can be simultaneously cooled by one cooling channel 61, and cooling can be performed more efficiently while reducing the number of cooling channels 61.
  • the upper portion of the flow path main portion 61a is provided in the partition wall portion 10d.
  • a portion provided on partition wall portion 10 d of cooling flow channel 61 has a portion overlapping with inverter portion 51 and a portion overlapping with capacitor portion 52 when viewed along vertical direction Z. . Therefore, the stator 30, the inverter unit 51, and the capacitor unit 52 can be more easily cooled by the refrigerant flowing in the cooling flow passage 61.
  • the capacitor portion 52 contacts the partition wall portion 10d. Therefore, the heat of the condenser portion 52 is easily released to the refrigerant in the cooling flow passage 61 along the partition wall portion 10 d. Therefore, the condenser portion 52 can be more easily cooled by the cooling flow passage 61.
  • the portion 10i located between the cooling flow passage 61 and the inverter portion 51 in the radial direction The dimension in the radial direction is smaller than that of the portion 10 h positioned between the flow path 61 and the capacitor portion 52 in the radial direction. That is, the radial dimension L1 of the portion 10i is smaller than the radial dimension L3 of the portion 10h.
  • the portion 10 j of the partition wall portion 10 d located between the cooling flow passage 61 and the inverter accommodation portion 15 in the radial direction is located between the cooling flow passage 61 and the stator accommodation portion 14 in the partition wall portion 10 d.
  • the radial dimension is smaller than the located portion 10k. That is, the radial dimension L1 of the portion 10i and the radial dimension L3 of the portion 10h are smaller than the radial dimension L2 of the portion 10k.
  • the dimension L2 can be relatively easily increased, the dimension in the radial direction of the portion of the circumferential wall portion 10b in contact with the stator core 31 can be easily increased. Thereby, the intensity
  • the dimension L1, the dimension L2, and the dimension L3 satisfy the relationship of L1 ⁇ L3 ⁇ L2.
  • the above-described magnitude relationship between the dimension L1, the dimension L2, and the dimension L3 may be established at least between the minimum values of the respective dimensions.
  • the dimension L1 and the dimension L2 differ depending on the position in the circumferential direction ⁇ , when the minimum value of the dimension L1 and the minimum value of the dimension L2 are compared with the dimension L3, L1 ⁇ L3 ⁇ L2 described above It suffices to satisfy the relationship.
  • the magnitude relationship among the dimensions L1, L2, and L3 satisfies the relationship of L1 ⁇ L3 ⁇ L2 at the central portion in the width direction X of the partition wall 10d.
  • the dimension L4 in the axial direction Y of the cooling flow passage 61 is substantially uniform regardless of the position in the circumferential direction ⁇ .
  • the dimension L4 in the axial direction Y of the cooling flow passage 61 is larger than the dimension L5 in the axial direction Y of the first circuit board 51a and the dimension L6 in the axial direction Y of the second circuit board 51b. Therefore, the dimension L4 in the axial direction Y of the cooling flow passage 61 can be made relatively large, and the range that can be cooled by one cooling flow passage 61 can be broadened. Further, the flow rate of the refrigerant flowing into the cooling flow passage 61 can be increased. Therefore, the cooling efficiency by the cooling channel 61 can be further improved.
  • the dimension L5 in the axial direction Y of the first circuit board 51a is smaller than the dimension L6 in the axial direction Y of the second circuit board 51b. That is, the dimension L4, the dimension L5, and the dimension L6 satisfy the relationship of L5 ⁇ L6 ⁇ L4.
  • the dimension L 4 in the axial direction Y of the cooling flow passage 61 is larger than the dimension in the axial direction Y of the condenser portion 52. As shown in FIG. 4, in the present embodiment, the dimension L4 in the axial direction Y of the cooling flow passage 61 is smaller than the dimension in the width direction X of the second circuit board 51 b and the dimension in the width direction X of the capacitor portion 52. Although not shown, the dimension L4 in the axial direction Y of the cooling flow passage 61 is smaller than the dimension in the width direction X of the first circuit board 51a.
  • the inflow port 61b is located at the center of the axial direction Y at the end on one circumferential side of the cooling flow path 61
  • the outflow port 61c is the cooling flow path It is located at the center of the axial direction Y at the other end of the circumferential direction 61. Therefore, even when the dimension L4 in the axial direction Y of the cooling passage 61 is relatively large, stagnation of the refrigerant in the cooling passage 61 can be easily suppressed, and the refrigerant is directed from the inflow port 61b to the outflow port 61c. It is easy to flow Therefore, the pressure loss of the refrigerant flowing through the cooling channel 61 can be reduced.
  • the maximum dimension in the width direction X of the cooling flow passage 61 is larger than the dimension in the width direction X of the second circuit board 51 b and the dimension in the width direction X of the capacitor portion 52. Moreover, although illustration is abbreviate
  • the maximum dimension in the width direction X of the cooling flow channel 61 is the width between the portion located on the one side in the width direction in the cooling flow channel 61 and the portion located on the other side in the width direction on the cooling flow channel 61. It is the distance in the direction X. In the present embodiment, the maximum dimension of the cooling flow passage 61 in the width direction X corresponds to the outer diameter of the arc-shaped cooling flow passage 61.
  • the cooling unit 60 is formed by a portion of the sand mold having the shape of the cooling unit 60 when the housing 10 is manufactured by sand casting.
  • the housing 10 has a plurality of discharge holes 19 for discharging a sand mold for forming the cooling unit 60.
  • the sand mold for forming the cooling unit 60 is discharged from the discharge hole 19.
  • the discharge hole 19 is connected to the cooling unit 60.
  • the plug 80 is pressed into the discharge hole 19.
  • the discharge hole 19 is closed by the plug 80, and the refrigerant in the cooling unit 60 can be prevented from leaking to the outside of the housing 10.
  • the cooling flow passage 161 and the capacitor portion are provided in the portion 110 j of the partition wall portion 110 d located between the cooling flow passage 161 and the inverter accommodation portion 15 in the radial direction.
  • the radial dimension of the portion 110 h positioned between the radial direction 52 and the radial direction is smaller than that of the portion 110 i positioned between the cooling flow path 161 and the inverter portion 51 in the radial direction. That is, the radial dimension L9 of the portion 110h is smaller than the radial dimension L7 of the portion 110i.
  • the cooling flow passage 161 can be easily brought close to the condenser 52, and the condenser 52 can be cooled more easily.
  • the upper surface of the partition wall portion 110d in contact with the capacitor portion 52 is located lower than the upper surface of the partition wall portion 110d on which the inverter portion 51 is installed.
  • the portion 110 k of the partition wall portion 110 d located between the cooling flow passage 161 and the stator accommodation portion 14 in the radial direction is located between the cooling flow passage 161 and the inverter accommodation portion 15 in the partition wall portion 110 d.
  • the radial dimension is smaller than that of the located portion 110 j. That is, the radial dimension L8 of the portion 110k is smaller than the radial dimension L7 of the portion 110i and the radial dimension L9 of the portion 110h.
  • the cooling flow passage 161 can be made closer to the stator accommodation portion 14 than the inverter accommodation portion 15, and the stator accommodation portion 14 can be more easily cooled.
  • the dimensions L7, L8, and L9 satisfy the relationship of L8 ⁇ L9 ⁇ L7.
  • the dimension of the end in the circumferential direction on one side of the cooling flow passage 261 decreases in the axial direction Y as going from the other side in the circumferential direction to the one side in the circumferential direction.
  • the first reduction unit 261 d is an end on one circumferential side of the flow path main portion 261 a.
  • the end on the other side in the circumferential direction of the cooling flow passage 261 is a second reduction portion 261e in which the dimension in the axial direction Y decreases as going from the one side in the circumferential direction to the other side in the circumferential direction.
  • the second reduction portion 261 e is an end on the other side in the circumferential direction of the flow path main portion 261 a.
  • the inflow port 261 b is located at one end of the first reduction portion 261 d in the circumferential direction. Accordingly, the refrigerant flowing from the inflow port 261b flows into the cooling flow path 261 from a portion where the dimension of the first reduction portion 261d in the axial direction Y is relatively small, and proceeds to the other side in the circumferential direction. Therefore, it is possible to suppress that the refrigerant flowing from the inflow port 261 b stagnates in the cooling channel 261. Further, the dimension of the first reduction portion 261 d in the axial direction Y increases toward the other side in the circumferential direction, so that the flow rate of the refrigerant flowing in the cooling flow passage 261 can be secured.
  • the outlet 261 c is located at the other end of the second reduction portion 261 e in the circumferential direction.
  • the refrigerant flowing out of the outlet 261 c flows out from the portion of the second reduction portion 261 e in which the dimension in the axial direction Y is relatively small. Therefore, the refrigerant flowing through the cooling channel 261 can be collected toward the outlet 261 c, and stagnation of the refrigerant in the peripheral portion of the outlet 261 c can be suppressed.
  • the inlet 261 b and the outlet 261 c are disposed at the same position in the vertical direction Z.
  • the inlet 261 b and the outlet 261 c are spaced apart in the axial direction Y.
  • the first reduction portion 261 d and the second reduction portion 261 e overlap with each other as viewed along the axial direction Y. That is, the end on one circumferential side of the cooling flow passage 261 and the end on the other circumferential side of the cooling flow passage 261 overlap each other when viewed along the axial direction Y. Therefore, the cooling passage 261 can surround the entire outer periphery of the stator 30 in the radial direction, and the stator 30 can be further cooled.
  • the first reduction unit 261 d is disposed on one side in the axial direction of the second reduction unit 261 e.
  • the first reduction portion 261 d and the second reduction portion 261 e are portions on the other side in the width direction of the cooling channel 261. That is, a portion of the cooling flow channel 261 which overlaps with each other in the axial direction Y is a portion on the other side of the cooling flow channel 261 in the width direction. Therefore, in the present embodiment, the portion provided in the partition wall portion 10d of the cooling flow passage 261 is a portion different from the portion overlapping the cooling passage 261 when viewed along the axial direction Y. Therefore, it is possible to provide the partition wall portion 10d with a portion of the cooling flow passage 261 that has a relatively large dimension in the axial direction Y. Thus, the stator 30 and the inverter unit 51 can be more easily cooled by the cooling flow passage 261.
  • the cooling channel may have an arc shape with a central angle ⁇ of 180 ° or less.
  • the dimension of the cooling flow path in the axial direction Y may be smaller than the dimension of the circuit board in the inverter portion in the axial direction Y.
  • the dimension in the axial direction Y of the cooling channel may be larger than the dimension in the width direction X of the circuit board and the dimension in the width direction X of the capacitor portion.
  • Two or more cooling channels may be provided.
  • two or more inlets and outlets provided for each cooling channel are also provided.
  • the radial dimensions of the plurality of cooling channels and the dimensions in the axial direction Y may be different from each other or may be the same.
  • the shapes of the plurality of cooling channels may be different from each other or may be the same.
  • the portion provided in the partition wall portion in the cooling flow path may not overlap with the inverter portion or may not overlap with the capacitor portion as viewed along the vertical direction Z.
  • the inlet may be provided at a position other than the center in the axial direction Y at an end on one circumferential side of the cooling channel.
  • the outlet may be provided at a position other than the center in the axial direction Y at the other circumferential end of the cooling channel.
  • the application of the motor of the embodiment described above is not particularly limited.
  • the motor of the embodiment described above is mounted on, for example, a vehicle.
  • each structure mentioned above can be combined suitably in the range which does not contradiction mutually.

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  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

An embodiment of a motor according to the present invention comprises: a rotor including a motor shaft; a stator opposing the rotor with a space therebetween in the radial direction; an inverter part electrically connected to the stator; and a housing including a stator housing part that houses the stator and an inverter housing part that houses the inverter part. The inverter housing part is located outside the stator housing part in the radial direction. The housing is a single member, and includes a cylindrical circumferential wall part that surrounds the rotor and the stator outside the rotor and the stator in the radial direction. The circumferential wall part includes: a cooling flow path; and a partitioning wall part that separates the stator housing part and the inverter housing part. The cooling flow path extends in the circumferential direction, and includes an inlet into which a refrigerant flows and an outlet from which the refrigerant flows out. At least a portion of the cooling flow path is provided in the partitioning wall part. The portion of the cooling flow path provided in the partitioning wall part is a single-layer flow path between the stator housing part and the inverter part in the radial direction.

Description

モータmotor
　本発明は、モータに関する。 The present invention relates to a motor.
　ロータおよびステータとインバータ装置とがハウジングに収容され、一体化されたモータが知られる。例えば、特開２０１５－１０４２５７号公報には、ロータおよびステータとインバータ装置とがハウジング内で中心軸線上に配置された構成が記載される。 A motor is known in which a rotor and a stator and an inverter device are housed in a housing and integrated. For example, Japanese Patent Application Laid-Open No. 2015-104257 describes a configuration in which a rotor, a stator, and an inverter device are disposed on a central axis in a housing.
特開２０１５－１０４２５７号公報JP, 2015-104257, A
　上記のようなモータにおいては、ステータおよびインバータ装置を効率的に冷却できることが求められる。ステータおよびインバータ装置を冷却する方法としては、冷媒が流れる冷却流路をハウジングに設けることが考えられる。しかし、単に冷却流路をハウジングに設けただけでは、ステータおよびインバータ装置の冷却効率を十分に得られない場合があった。 In the motor as described above, it is required that the stator and the inverter device can be efficiently cooled. As a method of cooling the stator and the inverter device, it is conceivable to provide a cooling flow passage through which the refrigerant flows in the housing. However, simply providing the cooling flow path in the housing may not provide sufficient cooling efficiency of the stator and the inverter device.
　本発明は、上記事情に鑑みて、冷却流路によるステータおよびインバータ部の冷却効率を向上できる構造を有するモータを提供することを目的の一つとする。 An object of the present invention is to provide a motor having a structure capable of improving the cooling efficiency of a stator and an inverter unit by a cooling flow channel in view of the above-mentioned circumstances.
　本発明のモータの一つの態様は、一方向に延びる中心軸に沿って配置されるモータシャフトを有するロータと、前記ロータと径方向に隙間を介して対向するステータと、前記ステータと電気的に接続されるインバータ部と、前記ステータを収容するステータ収容部および前記インバータ部を収容するインバータ収容部を有するハウジングと、を備え、前記インバータ収容部は、前記ステータ収容部の径方向外側に位置し、前記ハウジングは、前記ロータおよび前記ステータの径方向外側において前記ロータおよび前記ステータを囲む筒状の周壁部を有し、かつ単一の部材であり、前記周壁部は、冷却流路と、前記ステータ収容部と前記インバータ収容部とを仕切る仕切り壁部と、を有し、前記冷却流路は、冷媒が流入する流入口および前記冷媒が流出する流出口を有し、かつ、周方向に延び、前記冷却流路の少なくとも一部は、前記仕切り壁部に設けられ、前記冷却流路のうち前記仕切り壁部に設けられる部分は、前記ステータ収容部と前記インバータ部との径方向の間において単一層の流路である。 According to one aspect of the motor of the present invention, there is provided a rotor having a motor shaft disposed along a central axis extending in one direction, a stator opposed to the rotor via a gap in the radial direction, and the stator electrically An inverter unit to be connected, and a housing having a stator accommodating unit for accommodating the stator and an inverter accommodating unit for accommodating the inverter unit, the inverter accommodating unit being located radially outward of the stator accommodating unit The housing has a cylindrical peripheral wall portion surrounding the rotor and the stator on the radially outer side of the rotor and the stator, and is a single member, and the peripheral wall portion is a cooling channel, and A partition wall portion for partitioning the stator housing portion and the inverter housing portion; and the cooling flow path includes an inlet through which a refrigerant flows and the cooling flow path It has an outlet through which the medium flows out, and extends in the circumferential direction, at least a part of the cooling channel being provided in the partition wall, and a portion of the cooling channel being provided in the partition The flow passage is a single layer between the radial direction of the stator accommodation portion and the inverter portion.
　本発明の一つの態様によれば、冷却流路によるステータおよびインバータ部の冷却効率を向上できる構造を有するモータが提供される。 According to one aspect of the present invention, a motor having a structure capable of improving the cooling efficiency of the stator and the inverter unit by the cooling flow passage is provided.
図１は、第１実施形態のモータを示す斜視図である。FIG. 1 is a perspective view showing the motor of the first embodiment. 図２は、第１実施形態のモータを示す図であって、図１におけるII－II断面図である。FIG. 2 is a view showing the motor of the first embodiment, and is a cross-sectional view taken along the line II-II in FIG. 図３は、第１実施形態のモータを示す図であって、図２におけるIII－III断面図である。FIG. 3 is a view showing the motor of the first embodiment, and is a cross-sectional view taken along the line III-III in FIG. 図４は、第１実施形態のモータを上側から視た図である。FIG. 4 is a top view of the motor of the first embodiment. 図５は、第１実施形態の冷却部を示す斜視図である。FIG. 5 is a perspective view showing the cooling unit of the first embodiment. 図６は、第１実施形態のモータの一部を示す断面図である。FIG. 6 is a cross-sectional view showing a part of the motor of the first embodiment. 図７は、第１実施形態における変形例のモータの一部を示す断面図である。FIG. 7 is a cross-sectional view showing a part of a motor according to a modification of the first embodiment. 図８は、第２実施形態の冷却部を示す斜視図である。FIG. 8 is a perspective view showing a cooling unit of the second embodiment.
　各図に示すＺ軸方向は、正の側を上側とし、負の側を下側とする鉛直方向Ｚである。Ｙ軸方向は、各図に示す一方向に延びる中心軸Ｊと平行な方向であり、鉛直方向Ｚと直交する方向である。以下の説明においては、中心軸Ｊと平行な方向、すなわちＹ軸方向を「軸方向Ｙ」と呼ぶ。また、軸方向Ｙの正の側を、「軸方向一方側」と呼び、軸方向Ｙの負の側を、「軸方向他方側」と呼ぶ。各図に示すＸ軸方向は、軸方向Ｙおよび鉛直方向Ｚの両方と直交する方向である。以下の説明においては、Ｘ軸方向を「幅方向Ｘ」と呼ぶ。また、幅方向Ｘの正の側を「幅方向一方側」と呼び、幅方向Ｘの負の側を「幅方向他方側」と呼ぶ。本実施形態において、鉛直方向Ｚは、所定方向に相当する。 The Z-axis direction shown in each drawing is the vertical direction Z with the positive side as the upper side and the negative side as the lower side. The Y-axis direction is a direction parallel to the central axis J extending in one direction shown in each drawing and a direction orthogonal to the vertical direction Z. In the following description, a direction parallel to the central axis J, that is, the Y-axis direction is referred to as “axial direction Y”. Further, the positive side in the axial direction Y is referred to as “axial one side”, and the negative side in the axial direction Y is referred to as “axial other side”. The X-axis direction shown in each drawing is a direction orthogonal to both the axial direction Y and the vertical direction Z. In the following description, the X-axis direction is referred to as "width direction X". Further, the positive side in the width direction X is referred to as "one side in the width direction", and the negative side in the width direction X is referred to as the other side in the width direction. In the present embodiment, the vertical direction Z corresponds to a predetermined direction.
　また、中心軸Ｊを中心とする径方向を単に「径方向」と呼び、中心軸Ｊを中心とする周方向を単に「周方向θ」と呼ぶ。また、周方向θにおいて、軸方向他方側から軸方向一方側に向かって視て、反時計回りに進む側、すなわち図において周方向θを示す矢印の進む側と逆側を「周方向一方側」と呼び、時計回りに進む側、すなわち図において周方向θを示す矢印の進む側を「周方向他方側」と呼ぶ。 Further, a radial direction centered on the central axis J is simply referred to as “radial direction”, and a circumferential direction centered on the central axis J is simply referred to as “circumferential direction θ”. Further, in the circumferential direction θ, the side advancing in the counterclockwise direction as viewed from the other side in the axial direction to the one side in the axial direction, that is, the side opposite to the advancing side of the arrow showing the circumferential direction θ in the figure The side that travels clockwise, that is, the side on which the arrow indicating the circumferential direction θ in the drawing proceeds, is referred to as the “other side in the circumferential direction”.
　なお、鉛直方向、上側および下側とは、単に各部の相対位置関係を説明するための名称であり、実際の配置関係等は、これらの名称で示される配置関係等以外の配置関係等であってもよい。 Note that the vertical direction and the upper and lower sides are simply names for describing the relative positional relationship of each part, and the actual positional relationship etc. is a positional relationship other than the positional relationship etc indicated by these names. May be
＜第１実施形態＞
　図１および図２に示すように、本実施形態のモータ１は、ハウジング１０と、蓋部１１と、カバー部材１２と、センサカバー１３と、中心軸Ｊに沿って配置されるモータシャフト２１を有するロータ２０と、ステータ３０と、インバータユニット５０と、コネクタ部１８と、回転検出部７０と、を備える。 First Embodiment
As shown in FIGS. 1 and 2, the motor 1 according to this embodiment includes a housing 10, a lid 11, a cover member 12, a sensor cover 13, and a motor shaft 21 disposed along a central axis J. It has a rotor 20, a stator 30, an inverter unit 50, a connector portion 18, and a rotation detection portion 70.
　図２に示すように、ハウジング１０は、ロータ２０とステータ３０と回転検出部７０とインバータユニット５０とを収容する。ハウジング１０は、単一の部材である。ハウジング１０は、例えば、砂型鋳造で作製される。ハウジング１０は、周壁部１０ｂと、底壁部１０ａと、ベアリング保持部１０ｃと、角筒部１０ｅと、を有する。 As shown in FIG. 2, the housing 10 accommodates the rotor 20, the stator 30, the rotation detection unit 70, and the inverter unit 50. The housing 10 is a single member. The housing 10 is made, for example, by sand casting. The housing 10 has a peripheral wall portion 10b, a bottom wall portion 10a, a bearing holding portion 10c, and a rectangular tube portion 10e.
　周壁部１０ｂは、ロータ２０およびステータ３０の径方向外側においてロータ２０およびステータ３０を囲む筒状である。本実施形態において周壁部１０ｂは、中心軸Ｊを中心とする略円筒状である。周壁部１０ｂは、軸方向一方側に開口する。周壁部１０ｂは、ステータ３０およびインバータユニット５０を冷却する冷却部６０を有する。 The peripheral wall portion 10 b has a cylindrical shape that surrounds the rotor 20 and the stator 30 on the radially outer side of the rotor 20 and the stator 30. In the present embodiment, the peripheral wall portion 10 b is substantially cylindrical with the central axis J as a center. The peripheral wall portion 10 b is open to one side in the axial direction. The peripheral wall portion 10 b has a cooling portion 60 that cools the stator 30 and the inverter unit 50.
　底壁部１０ａは、周壁部１０ｂの軸方向他方側の端部に設けられる。底壁部１０ａは、周壁部１０ｂの軸方向他方側を塞ぐ。底壁部１０ａは、底壁部１０ａを軸方向Ｙに貫通するセンサ収容部１０ｇを有する。センサ収容部１０ｇは、軸方向Ｙに沿って視て、例えば、中心軸Ｊを中心とする円形状である。底壁部１０ａと周壁部１０ｂとによって、ステータ収容部１４が構成される。すなわち、ハウジング１０は、周壁部１０ｂと底壁部１０ａとを有する有底筒状のステータ収容部１４を有する。 The bottom wall portion 10a is provided at the other end of the circumferential wall portion 10b in the axial direction. The bottom wall portion 10a closes the other side of the circumferential wall portion 10b in the axial direction. The bottom wall portion 10a has a sensor housing portion 10g penetrating the bottom wall portion 10a in the axial direction Y. The sensor storage portion 10 g has, for example, a circular shape centered on the central axis J when viewed along the axial direction Y. The bottom housing portion 10 a and the peripheral wall portion 10 b constitute a stator housing portion 14. That is, the housing 10 has a bottomed cylindrical stator housing portion 14 having a peripheral wall portion 10 b and a bottom wall portion 10 a.
　ベアリング保持部１０ｃは、底壁部１０ａの軸方向一方側の面におけるセンサ収容部１０ｇの周縁部から軸方向一方側に突出する円筒状である。ベアリング保持部１０ｃは、後述するロータコア２２よりも軸方向他方側においてモータシャフト２１を支持するベアリングを保持する。 The bearing holding portion 10c has a cylindrical shape that protrudes in the axial direction from the peripheral edge portion of the sensor accommodating portion 10g on the surface on the one side in the axial direction of the bottom wall portion 10a. The bearing holder 10 c holds a bearing that supports the motor shaft 21 on the other side in the axial direction with respect to the rotor core 22 described later.
　図１から図４に示すように、角筒部１０ｅは、周壁部１０ｂから上側に延びる角筒状である。角筒部１０ｅは、上側に開口する。本実施形態において角筒部１０ｅは、例えば、正方形筒状である。図２に示すように、角筒部１０ｅを構成する壁部のうち軸方向他方側の壁部は、底壁部１０ａの上端部に繋がる。角筒部１０ｅは、角筒部１０ｅを構成する壁部のうち軸方向一方側の壁部を軸方向Ｙに貫通する貫通孔１０ｆを有する。貫通孔１０ｆの下端部は、周壁部１０ｂの軸方向一方側の開口と繋がる。角筒部１０ｅと周壁部１０ｂとによって、インバータ収容部１５が構成される。すなわち、ハウジング１０は、インバータ収容部１５を有する。 As shown in FIGS. 1 to 4, the rectangular tube portion 10 e has a rectangular tube shape extending upward from the peripheral wall portion 10 b. The rectangular tube portion 10e opens upward. In the present embodiment, the rectangular tube portion 10 e has, for example, a square tube shape. As shown in FIG. 2, of the wall parts constituting the rectangular tube part 10 e, the wall part on the other side in the axial direction is connected to the upper end part of the bottom wall part 10 a. The square tube portion 10 e has a through hole 10 f penetrating in the axial direction Y a wall portion on one side in the axial direction among wall portions constituting the square tube portion 10 e. The lower end portion of the through hole 10 f is connected to the opening on one side in the axial direction of the peripheral wall portion 10 b. An inverter accommodating portion 15 is configured by the rectangular tube portion 10 e and the peripheral wall portion 10 b. That is, the housing 10 has an inverter accommodating portion 15.
　インバータ収容部１５は、ステータ収容部１４の径方向外側に位置する。本実施形態においてインバータ収容部１５は、軸方向Ｙと直交する鉛直方向Ｚにおいて、ステータ収容部１４の上側に位置する。ステータ収容部１４とインバータ収容部１５とは、仕切り壁部１０ｄによって鉛直方向Ｚに仕切られる。仕切り壁部１０ｄは、周壁部１０ｂの上側の部分である。すなわち、周壁部１０ｂは、ステータ収容部１４とインバータ収容部１５とを仕切る仕切り壁部１０ｄを有する。 The inverter accommodating portion 15 is located radially outside the stator accommodating portion 14. In the present embodiment, the inverter accommodating portion 15 is located above the stator accommodating portion 14 in the vertical direction Z orthogonal to the axial direction Y. The stator housing portion 14 and the inverter housing portion 15 are partitioned in the vertical direction Z by the partition wall portion 10 d. The partition wall portion 10d is an upper portion of the peripheral wall portion 10b. That is, the peripheral wall portion 10 b has a partition wall portion 10 d that divides the stator accommodation portion 14 and the inverter accommodation portion 15.
　図３に示すように、仕切り壁部１０ｄの鉛直方向Ｚの寸法は、軸方向Ｙおよび鉛直方向Ｚの両方と直交する幅方向Ｘにおいて中心軸Ｊから離れる程、大きくなる。すなわち、仕切り壁部１０ｄの鉛直方向Ｚの寸法は、幅方向Ｘの位置が中心軸Ｊと同じ中央部分において最も小さく、中央部分から幅方向Ｘの両側に離れるに従って大きくなる。 As shown in FIG. 3, the dimension in the vertical direction Z of the partition wall portion 10 d becomes larger as it goes away from the central axis J in the width direction X orthogonal to both the axial direction Y and the vertical direction Z. That is, the dimension in the vertical direction Z of the partition wall portion 10d is smallest at the central portion where the position in the width direction X is the same as the central axis J, and increases as moving away from the central portion on both sides in the width direction X.
　図２に示す蓋部１１は、板面が鉛直方向Ｚと直交する板状である。蓋部１１は、角筒部１０ｅの上端部に固定される。蓋部１１は、角筒部１０ｅの上側の開口を閉塞する。なお、図４においては、蓋部１１の図示を省略する。図１および図２に示すように、カバー部材１２は、板面が軸方向Ｙと直交する板状である。カバー部材１２は、周壁部１０ｂおよび角筒部１０ｅの軸方向一方側の面に固定される。カバー部材１２は、周壁部１０ｂの軸方向一方側の開口および貫通孔１０ｆを閉塞する。 The lid 11 shown in FIG. 2 has a plate shape whose plate surface is orthogonal to the vertical direction Z. The lid portion 11 is fixed to the upper end portion of the rectangular tube portion 10 e. The lid 11 closes the upper opening of the rectangular tube 10 e. In addition, illustration of the cover part 11 is abbreviate | omitted in FIG. As shown in FIGS. 1 and 2, the cover member 12 has a plate shape whose plate surface is orthogonal to the axial direction Y. The cover member 12 is fixed to a surface on one side in the axial direction of the peripheral wall portion 10b and the rectangular tube portion 10e. The cover member 12 closes the opening on one axial side of the peripheral wall portion 10b and the through hole 10f.
　図２に示すように、カバー部材１２は、カバー部材１２を軸方向Ｙに貫通する出力軸孔１２ａを有する。出力軸孔１２ａは、例えば、中心軸Ｊを通る円形状である。カバー部材１２は、カバー部材１２の軸方向他方側の面における出力軸孔１２ａの周縁部から軸方向他方側に突出するベアリング保持部１２ｂを有する。ベアリング保持部１２ｂは、後述するロータコア２２よりも軸方向一方側においてモータシャフト２１を支持するベアリングを保持する。 As shown in FIG. 2, the cover member 12 has an output shaft hole 12 a that penetrates the cover member 12 in the axial direction Y. The output shaft hole 12a has, for example, a circular shape passing through the central axis J. The cover member 12 has a bearing holding portion 12b projecting to the other axial side from the peripheral edge portion of the output shaft hole 12a in the surface on the other axial side of the cover member 12. The bearing holding portion 12 b holds a bearing that supports the motor shaft 21 on one side in the axial direction with respect to a rotor core 22 described later.
　センサカバー１３は、底壁部１０ａの軸方向他方側の面に固定される。センサカバー１３は、センサ収容部１０ｇの軸方向他方側の開口を覆い、閉塞する。センサカバー１３は、回転検出部７０を軸方向他方側から覆う。 The sensor cover 13 is fixed to the other surface of the bottom wall portion 10 a in the axial direction. The sensor cover 13 covers and closes the opening on the other side in the axial direction of the sensor housing portion 10g. The sensor cover 13 covers the rotation detection unit 70 from the other side in the axial direction.
　ロータ２０は、モータシャフト２１と、ロータコア２２と、マグネット２３と、第１エンドプレート２４と、第２エンドプレート２５と、を有する。モータシャフト２１は、軸方向両側の部分をそれぞれベアリングによって回転自在に支持される。モータシャフト２１の軸方向一方側の端部は、周壁部１０ｂの軸方向一方側の開口から軸方向一方側へ向けて突出する。モータシャフト２１の軸方向一方側の端部は、出力軸孔１２ａを通り、カバー部材１２よりも軸方向一方側に突出する。モータシャフト２１の軸方向他方側の端部は、センサ収容部１０ｇに挿入される。 The rotor 20 has a motor shaft 21, a rotor core 22, a magnet 23, a first end plate 24 and a second end plate 25. The motor shaft 21 is rotatably supported by bearings at axially opposite portions. The end of the motor shaft 21 on the one side in the axial direction protrudes from the opening on the one side in the axial direction of the peripheral wall portion 10 b toward the one side in the axial direction. An end of the motor shaft 21 on one side in the axial direction passes through the output shaft hole 12 a and protrudes to one side in the axial direction with respect to the cover member 12. The other axial end of the motor shaft 21 is inserted into the sensor housing 10g.
　ロータコア２２は、モータシャフト２１の外周面に固定される。マグネット２３は、ロータコア２２に設けられたロータコア２２を軸方向Ｙに貫通する孔部に挿入される。第１エンドプレート２４および第２エンドプレート２５は、径方向に拡がる円環板状である。第１エンドプレート２４と第２エンドプレート２５とは、ロータコア２２と接触した状態で、ロータコア２２を軸方向Ｙに挟む。第１エンドプレート２４と第２エンドプレート２５とは、ロータコア２２の孔部に挿入されたマグネット２３を軸方向両側から押さえる。 The rotor core 22 is fixed to the outer peripheral surface of the motor shaft 21. The magnet 23 is inserted into a hole passing through the rotor core 22 provided in the rotor core 22 in the axial direction Y. The first end plate 24 and the second end plate 25 are in the form of a radially expanding annular plate. The first end plate 24 and the second end plate 25 sandwich the rotor core 22 in the axial direction Y while in contact with the rotor core 22. The first end plate 24 and the second end plate 25 press the magnet 23 inserted into the hole of the rotor core 22 from both sides in the axial direction.
　ステータ３０は、ロータ２０と径方向に隙間を介して対向する。ステータ３０は、ステータコア３１と、ステータコア３１に装着される複数のコイル３２と、を有する。ステータコア３１は、中心軸Ｊを中心とした円環状である。ステータコア３１の外周面は、周壁部１０ｂの内周面に固定される。ステータコア３１は、ロータコア２２の径方向外側に隙間を介して対向する。 The stator 30 faces the rotor 20 in the radial direction via a gap. The stator 30 has a stator core 31 and a plurality of coils 32 mounted on the stator core 31. The stator core 31 has an annular shape centered on the central axis J. The outer peripheral surface of the stator core 31 is fixed to the inner peripheral surface of the peripheral wall 10b. The stator core 31 faces the radially outer side of the rotor core 22 via a gap.
　インバータユニット５０は、ステータ３０に供給される電力を制御する。インバータユニット５０は、インバータ部５１と、コンデンサ部５２と、を有する。すなわち、モータ１は、インバータ部５１と、コンデンサ部５２と、を備える。インバータ部５１は、インバータ収容部１５に収容される。インバータ部５１は、回路基板として、第１回路基板５１ａと、第２回路基板５１ｂと、を有する。第１回路基板５１ａおよび第２回路基板５１ｂは、板面が鉛直方向Ｚと直交する板状である。第２回路基板５１ｂは、第１回路基板５１ａの上側に離れて配置される。第１回路基板５１ａと第２回路基板５１ｂとは電気的に接続される。第１回路基板５１ａには、コネクタ端子５３を介してコイル線３２ａが接続される。これにより、インバータ部５１は、ステータ３０と電気的に接続される。 The inverter unit 50 controls the power supplied to the stator 30. The inverter unit 50 includes an inverter unit 51 and a capacitor unit 52. That is, the motor 1 includes an inverter unit 51 and a capacitor unit 52. The inverter unit 51 is accommodated in the inverter accommodation unit 15. The inverter unit 51 includes a first circuit board 51 a and a second circuit board 51 b as circuit boards. The first circuit board 51 a and the second circuit board 51 b have a plate shape whose plate surface is orthogonal to the vertical direction Z. The second circuit board 51b is spaced apart above the first circuit board 51a. The first circuit board 51a and the second circuit board 51b are electrically connected. The coil wire 32 a is connected to the first circuit board 51 a via the connector terminal 53. Thus, the inverter unit 51 is electrically connected to the stator 30.
　図２および図４に示すように、コンデンサ部５２は、幅方向Ｘに長い直方体状である。コンデンサ部５２は、インバータ収容部１５に収容される。コンデンサ部５２は、インバータ部５１の軸方向他方側に配置される。すなわち、インバータ収容部１５において、インバータ部５１とコンデンサ部５２とは、軸方向Ｙに並んで配置される。コンデンサ部５２は、インバータ部５１と電気的に接続される。図２に示すように、コンデンサ部５２は、仕切り壁部１０ｄの上面に固定される。コンデンサ部５２は、仕切り壁部１０ｄに接触する。 As shown in FIG. 2 and FIG. 4, the capacitor portion 52 is in the shape of a rectangular solid long in the width direction X. Capacitor portion 52 is accommodated in inverter accommodating portion 15. The capacitor unit 52 is disposed on the other side of the inverter unit 51 in the axial direction. That is, in the inverter accommodating portion 15, the inverter portion 51 and the capacitor portion 52 are arranged side by side in the axial direction Y. The capacitor unit 52 is electrically connected to the inverter unit 51. As shown in FIG. 2, the capacitor portion 52 is fixed to the upper surface of the partition wall portion 10 d. Condenser part 52 contacts partition wall part 10d.
　図１に示すように、コネクタ部１８は、角筒部１０ｅの幅方向他方側の面に設けられる。コネクタ部１８には、図示しない外部電源が接続される。コネクタ部１８に接続された外部電源からインバータユニット５０に電源が供給される。 As shown in FIG. 1, the connector portion 18 is provided on the other surface of the rectangular tube portion 10 e in the width direction. An external power supply (not shown) is connected to the connector portion 18. Power is supplied to the inverter unit 50 from an external power supply connected to the connector unit 18.
　回転検出部７０は、ロータ２０の回転を検出する。本実施形態において回転検出部７０は、例えば、ＶＲ（Ｖａｒｉａｂｌｅ　Ｒｅｌｕｃｔａｎｃｅ）型レゾルバである。図２に示すように、回転検出部７０は、センサ収容部１０ｇに収容される。すなわち、回転検出部７０は、底壁部１０ａに配置される。回転検出部７０は、被検出部７１と、センサ部７２と、を有する。 The rotation detection unit 70 detects the rotation of the rotor 20. In the present embodiment, the rotation detection unit 70 is, for example, a VR (Variable Reluctance) resolver. As shown in FIG. 2, the rotation detection unit 70 is accommodated in the sensor accommodation unit 10 g. That is, the rotation detection unit 70 is disposed on the bottom wall portion 10a. The rotation detection unit 70 includes a detection target unit 71 and a sensor unit 72.
　被検出部７１は、周方向θに延びる環状である。被検出部７１は、モータシャフト２１に嵌め合わされて固定される。被検出部７１は、磁性体製である。センサ部７２は、被検出部７１の径方向外側を囲む環状である。センサ部７２は、センサ収容部１０ｇに嵌め合わされる。センサ部７２は、センサカバー１３によって軸方向他方側から支持される。すなわち、センサカバー１３は、回転検出部７０を軸方向他方側から支持する。センサ部７２は、周方向θに沿って複数のコイルを有する。 The to-be-detected part 71 is annular shaped extended in the circumferential direction θ. The to-be-detected part 71 is fitted and fixed to the motor shaft 21. The to-be-detected part 71 is made of magnetic material. The sensor unit 72 has an annular shape surrounding the outside in the radial direction of the detection target 71. The sensor unit 72 is fitted to the sensor storage unit 10g. The sensor unit 72 is supported by the sensor cover 13 from the other side in the axial direction. That is, the sensor cover 13 supports the rotation detection unit 70 from the other side in the axial direction. The sensor unit 72 has a plurality of coils along the circumferential direction θ.
　図示は省略するが、モータ１は、回転検出部７０とインバータ部５１とを電気的に接続するセンサ配線をさらに備える。センサ配線の一端は、被検出部７１に接続される。センサ配線は、被検出部７１から、底壁部１０ａの内部および仕切り壁部１０ｄを径方向に貫通する貫通孔を通って、インバータ収容部１５内まで引き回される。センサ配線の他端は、例えば、第１回路基板５１ａに接続される。 Although not shown, the motor 1 further includes a sensor wire that electrically connects the rotation detection unit 70 and the inverter unit 51. One end of the sensor wiring is connected to the detected portion 71. The sensor wiring is routed from the detected portion 71 to the inside of the inverter accommodating portion 15 through a through hole which penetrates the inside of the bottom wall portion 10a and the partition wall portion 10d in the radial direction. The other end of the sensor wiring is connected to, for example, the first circuit board 51a.
　モータシャフト２１とともに被検出部７１が回転することによって、センサ部７２のコイルには、被検出部７１の周方向位置に応じた誘起電圧が生じる。センサ部７２は、誘起電圧を検出することで、被検出部７１の回転を検出する。これにより、回転検出部７０は、モータシャフト２１の回転を検出して、ロータ２０の回転を検出する。回転検出部７０が検出したロータ２０の回転情報は、センサ配線を介してインバータ部５１に送られる。 When the detected portion 71 rotates with the motor shaft 21, an induced voltage is generated in the coil of the sensor portion 72 according to the circumferential position of the detected portion 71. The sensor unit 72 detects the induced voltage to detect the rotation of the detection target unit 71. Thus, the rotation detection unit 70 detects the rotation of the motor shaft 21 and detects the rotation of the rotor 20. The rotation information of the rotor 20 detected by the rotation detection unit 70 is sent to the inverter unit 51 via the sensor wiring.
　図５に示すように、冷却部６０は、冷却流路６１を有する。すなわち、周壁部１０ｂは、冷却流路６１を有する。本実施形態では、冷却部６０は、１つの冷却流路６１のみで構成される。なお、図５においては、冷却部６０の内部空間を立体形状として示す。 As shown in FIG. 5, the cooling unit 60 has a cooling channel 61. That is, the peripheral wall portion 10 b has the cooling flow passage 61. In the present embodiment, the cooling unit 60 is configured of only one cooling channel 61. In FIG. 5, the internal space of the cooling unit 60 is shown as a three-dimensional shape.
　冷却流路６１には、冷媒が流れる。冷媒は、ステータ３０およびインバータ部５１を冷却できる流体ならば、特に限定されない。冷媒は、水であってもよいし、水以外の液体であってもよいし、気体であってもよい。 A refrigerant flows in the cooling channel 61. The refrigerant is not particularly limited as long as it is a fluid that can cool the stator 30 and the inverter unit 51. The refrigerant may be water, a liquid other than water, or a gas.
　冷却流路６１は、周方向θに延びる。冷却流路６１は、流路本体部６１ａと、流入口６１ｂと、流出口６１ｃと、を有する。流路本体部６１ａは、軸方向Ｙに幅広で周方向θに延びる円弧状である。図３に示すように、流路本体部６１ａは、周壁部１０ｂにおける幅方向他方側の部分から、周壁部１０ｂを周方向θに沿ってほぼ一周して設けられる。流路本体部６１ａの中心角φは、１８０°よりも大きい。これにより、冷却流路６１は、中心角φが１８０°よりも大きい円弧状である。冷却流路６１は、幅方向他方側に開口するＣ字形状である。 The cooling channel 61 extends in the circumferential direction θ. The cooling channel 61 has a channel body 61a, an inlet 61b, and an outlet 61c. The flow path main body portion 61 a has a circular arc shape which is wide in the axial direction Y and extends in the circumferential direction θ. As shown in FIG. 3, the flow path main body portion 61a is provided on the peripheral wall portion 10b along the circumferential direction θ substantially from the other side in the width direction of the peripheral wall portion 10b. The central angle φ of the flow passage main portion 61a is larger than 180 °. Thus, the cooling flow passage 61 is in the shape of a circular arc having a central angle φ larger than 180 °. The cooling channel 61 has a C-shape opening on the other side in the width direction.
　図５に示すように、流入口６１ｂは、冷却流路６１の周方向一方側の端部における軸方向Ｙの中央に位置する。流入口６１ｂは、流路本体部６１ａの周方向一方側の端部から幅方向他方側に突出する。流入口６１ｂには、冷媒が流入する。流入口６１ｂの幅方向Ｘと直交する断面形状は、例えば、円形状である。図３に示すように、流入口６１ｂには、流入パイプ１６が連結される。流入パイプ１６は、ハウジング１０に設けられた孔部に挿し込まれる。流入パイプ１６は、ハウジング１０から幅方向他方側に突出する。 As shown in FIG. 5, the inflow port 61 b is located at the center of the axial direction Y at the end on one circumferential side of the cooling channel 61. The inflow port 61b protrudes to the other side in the width direction from an end on one side in the circumferential direction of the flow path main portion 61a. The refrigerant flows into the inflow port 61b. The cross-sectional shape orthogonal to the width direction X of the inflow port 61b is, for example, a circular shape. As shown in FIG. 3, the inflow pipe 16 is connected to the inflow port 61 b. The inflow pipe 16 is inserted into a hole provided in the housing 10. The inflow pipe 16 protrudes from the housing 10 to the other side in the width direction.
　流出口６１ｃは、冷却流路６１の周方向他方側の端部における軸方向Ｙの中央に位置する。流出口６１ｃは、流路本体部６１ａの周方向他方側の端部から幅方向他方側に突出する。流出口６１ｃからは、冷媒が流出される。流出口６１ｃの幅方向Ｘと直交する断面形状は、例えば、円形状である。流出口６１ｃの形状は、流入口６１ｂの形状と同様である。図５に示すように、流入口６１ｂと流出口６１ｃとは、軸方向Ｙにおいて同じ位置に配置される。流入口６１ｂと流出口６１ｃとは、鉛直方向Ｚに間隔を空けて配置される。 The outlet 61 c is located at the center in the axial direction Y at the other circumferential end of the cooling channel 61. The outflow port 61c protrudes from the end on the other side in the circumferential direction of the flow path main portion 61a to the other side in the width direction. The refrigerant flows out from the outlet 61c. The cross-sectional shape orthogonal to the width direction X of the outflow port 61c is, for example, a circular shape. The shape of the outlet 61c is similar to the shape of the inlet 61b. As shown in FIG. 5, the inlet 61 b and the outlet 61 c are disposed at the same position in the axial direction Y. The inlet 61 b and the outlet 61 c are spaced apart in the vertical direction Z.
　図３に示すように、流出口６１ｃには、流出パイプ１７が連結される。流出パイプ１７は、ハウジング１０に設けられた孔部に挿し込まれる。流出パイプ１７は、ハウジング１０から幅方向他方側に突出する。図１に示すように、流入パイプ１６と流出パイプ１７とは、軸方向Ｙにおいて同じ位置に配置される。流入パイプ１６と流出パイプ１７とは、鉛直方向Ｚに間隔を空けて配置される。 As shown in FIG. 3, the outlet pipe 17 is connected to the outlet 61 c. The outflow pipe 17 is inserted into a hole provided in the housing 10. The outflow pipe 17 projects from the housing 10 to the other side in the width direction. As shown in FIG. 1, the inflow pipe 16 and the outflow pipe 17 are disposed at the same position in the axial direction Y. The inflow pipe 16 and the outflow pipe 17 are spaced in the vertical direction Z from each other.
　流入パイプ１６から流入口６１ｂを介して冷却流路６１に流入した冷媒は、周方向一方側から周方向他方側に向かって流れ、流出口６１ｃから流出パイプ１７を介して、ハウジング１０の外部に流出する。本実施形態において冷却流路６１を流れる冷媒は、周方向θのうち一方の向きのみに流れる。すなわち、本実施形態においては、冷却流路６１を流れる冷媒は、周方向一方側から周方向他方側に向かってのみ流れ、周方向他方側から周方向一方側に向かっては流れない。そのため、冷媒の流れる向きが互いに異なる複数の冷却流路が設けられる場合に比べて、冷却流路６１に冷媒を循環させることが容易である。 The refrigerant flowing from the inflow pipe 16 into the cooling flow passage 61 through the inflow port 61b flows from one side in the circumferential direction to the other side in the circumferential direction, and is discharged from the outflow port 61c to the outside of the housing 10 through the outflow pipe 17. leak. In the present embodiment, the refrigerant flowing through the cooling flow passage 61 flows only in one direction in the circumferential direction θ. That is, in the present embodiment, the refrigerant flowing in the cooling flow passage 61 flows only from one circumferential side to the other circumferential side, and does not flow from the other circumferential side to the circumferential one side. Therefore, it is easy to circulate the refrigerant in the cooling flow passage 61 as compared to the case where a plurality of cooling flow passages in which the flow directions of the refrigerant flow are different from each other.
　本明細書において「冷媒が、周方向θのうち一方の向きのみに流れる」とは、冷媒の移動する向きのベクトル成分のうち周方向θに沿ったベクトル成分が、周方向θの一方の向きのみの場合を含む。すなわち、冷媒の位置が周方向θにおいて一方の向きに移動するならば、冷媒全体としての流れる向きが周方向θに対して傾いていてもよい。 In the present specification, “the refrigerant flows only in one direction in the circumferential direction θ” means that the vector component along the circumferential direction θ among vector components in the moving direction of the refrigerant has one direction in the circumferential direction θ. Including only cases. That is, if the position of the refrigerant moves in one direction in the circumferential direction θ, the flow direction of the refrigerant as a whole may be inclined with respect to the circumferential direction θ.
　図６に示すように、冷却流路６１の少なくとも一部は、仕切り壁部１０ｄに設けられる。したがって、冷却流路６１を流れる冷媒によって、仕切り壁部１０ｄで仕切られるステータ収容部１４とインバータ収容部１５とを冷却することができ、ステータ収容部１４に収容されるステータ３０およびインバータ収容部１５に収容されるインバータ部５１を冷却することができる。 As shown in FIG. 6, at least a part of the cooling channel 61 is provided in the partition wall portion 10 d. Therefore, the stator accommodating portion 14 and the inverter accommodating portion 15 partitioned by the partition wall portion 10 d can be cooled by the refrigerant flowing through the cooling flow passage 61, and the stator 30 and the inverter accommodating portion 15 accommodated in the stator accommodating portion 14. Can be cooled.
　本実施形態では、冷却流路６１に流入した冷媒は、周壁部１０ｂの上端部、すなわち仕切り壁部１０ｄと、周壁部１０ｂの幅方向一方側の端部と、周壁部１０ｂの下端部と、を順に通って流れる。そのため、流入口６１ｂから冷却流路６１に流入した直後の比較的温度が低い冷媒を仕切り壁部１０ｄに流すことができ、インバータ部５１を冷却できる。これにより、インバータ部５１をより冷却しやすい。インバータ部５１は、特に発熱が大きくなりやすいため、インバータ部５１を冷却しやすいことで、より好適にモータ１の冷却を行える。 In the present embodiment, the refrigerant having flowed into the cooling flow passage 61 is the upper end of the peripheral wall 10b, that is, the partition wall 10d, the one end of the peripheral wall 10b in the width direction, and the lower end of the peripheral wall 10b Flow through in order. Therefore, the refrigerant whose temperature is relatively low immediately after flowing into the cooling channel 61 from the inflow port 61 b can flow to the partition wall portion 10 d, and the inverter portion 51 can be cooled. This makes it easier to cool the inverter unit 51. The heat generation of the inverter unit 51 is particularly likely to be large, and thus the motor 1 can be cooled more preferably by cooling the inverter unit 51 easily.
　本実施形態において冷却流路６１のうち仕切り壁部１０ｄに設けられる部分は、ステータ収容部１４とインバータ部５１との径方向の間において単一層の流路である。そのため、複数層の流路が径方向に並んで設けられる場合に比べて、冷却流路６１の構成を簡単化できる。これにより、単一層の冷却流路６１によってステータ３０とインバータ部５１との両方を冷却することができ、効率的である。また、仕切り壁部１０ｄの径方向の寸法を小さくしやすく、モータ１を小型化しやすい。また、冷却流路６１が周方向θに延びるため、例えば冷却流路が軸方向Ｙに延びる場合に比べて、冷却流路６１によってステータ３０の周囲を囲みやすく、ステータ３０を冷却しやすい。 In the present embodiment, a portion provided in the partition wall portion 10 d in the cooling flow passage 61 is a single layer flow passage between the stator accommodation portion 14 and the inverter portion 51 in the radial direction. Therefore, the configuration of the cooling flow channel 61 can be simplified as compared with the case where the flow channels of a plurality of layers are provided side by side in the radial direction. As a result, both the stator 30 and the inverter unit 51 can be cooled by the single layer cooling flow passage 61, which is efficient. Further, the dimension in the radial direction of the partition wall portion 10d can be easily reduced, and the motor 1 can be easily miniaturized. In addition, since the cooling flow passage 61 extends in the circumferential direction θ, for example, the cooling flow passage 61 can easily surround the stator 30 and the stator 30 can be cooled more easily than when the cooling flow passage extends in the axial direction Y.
　以上により、本実施形態によれば、冷却流路６１によるステータ３０およびインバータ部５１の冷却効率を向上できる構造を有するモータ１が得られる。 As described above, according to the present embodiment, the motor 1 having a structure capable of improving the cooling efficiency of the stator 30 and the inverter unit 51 by the cooling flow passage 61 can be obtained.
　本明細書において「ある流路が、ある部分において単一層の流路である」とは、ある部分内において、ある連続した流路が１つのみ設けられることを含む。例えば、全体として連続した同じ流路であっても、ある部分内において非連続となる２つの部分が設けられる場合には、ある部分において複数層の流路が設けられた状態である。本実施形態では、ステータ収容部１４とインバータ部５１との径方向の間に設けられる冷却流路６１の部分は、連続した１つの部分のみである。 In the present specification, "a channel is a channel in a single layer in a part" includes that only one continuous channel is provided in a part. For example, even if the same flow path is continuous as a whole, in the case where two portions that are discontinuous in a certain portion are provided, a plurality of layers of flow paths are provided in a certain portion. In the present embodiment, the portion of the cooling passage 61 provided between the stator accommodation portion 14 and the inverter portion 51 in the radial direction is only one continuous portion.
　また、本実施形態によれば、冷却流路６１は、１つのみ設けられ、周方向θに延びる。そのため、例えば冷却流路を波形状にする場合に比べて、冷却流路６１を作製しやすい。また、例えば冷却流路を波形状にする場合、波形に並ぶ流路部分同士の間には、冷媒が流れないため、冷却流路の面積を十分に大きくしにくい場合があった。これに対して、本実施形態によれば、冷却流路６１は、周方向θに延びる単一の流路であるため、冷却流路６１の面積を大きくしやすく、冷却流路６１によって冷却できる範囲を大きくしやすい。 Further, according to the present embodiment, only one cooling channel 61 is provided and extends in the circumferential direction θ. Therefore, for example, the cooling channel 61 can be easily manufactured as compared with the case where the cooling channel is formed in a wave shape. Further, for example, in the case where the cooling flow path is formed in a wave shape, the refrigerant does not flow between the flow path portions aligned in the waveform, so it may be difficult to sufficiently increase the area of the cooling flow path. On the other hand, according to the present embodiment, since the cooling flow passage 61 is a single flow passage extending in the circumferential direction θ, the area of the cooling flow passage 61 can be easily increased, and the cooling flow passage 61 can be cooled. It is easy to enlarge the range.
　また、本実施形態によれば、冷却流路６１は、中心角φが１８０°よりも大きい円弧状である。そのため、冷却流路６１によってステータ３０の周りを囲みやすく、ステータ３０をより冷却することができる。 Further, according to the present embodiment, the cooling channel 61 is in the shape of a circular arc having a central angle φ larger than 180 °. Therefore, it is easy to surround the stator 30 by the cooling flow passage 61, and the stator 30 can be cooled more.
　また、本実施形態によれば、冷却流路６１によって、インバータ収容部１５に収容されるコンデンサ部５２も冷却することができる。これにより、１つの冷却流路６１によって３つの部分を同時に冷却することができ、冷却流路６１の数を少なくしつつ、より効率的に冷却を行うことができる。 Further, according to the present embodiment, the condenser portion 52 accommodated in the inverter accommodating portion 15 can also be cooled by the cooling flow passage 61. Thus, three parts can be simultaneously cooled by one cooling channel 61, and cooling can be performed more efficiently while reducing the number of cooling channels 61.
　本実施形態では、流路本体部６１ａの上側部分が、仕切り壁部１０ｄに設けられる。図６に示すように、鉛直方向Ｚに沿って視て、冷却流路６１のうち仕切り壁部１０ｄに設けられる部分は、インバータ部５１と重なる部分と、コンデンサ部５２と重なる部分と、を有する。そのため、冷却流路６１に流れる冷媒によって、ステータ３０とインバータ部５１とコンデンサ部５２とをより冷却しやすい。 In the present embodiment, the upper portion of the flow path main portion 61a is provided in the partition wall portion 10d. As shown in FIG. 6, a portion provided on partition wall portion 10 d of cooling flow channel 61 has a portion overlapping with inverter portion 51 and a portion overlapping with capacitor portion 52 when viewed along vertical direction Z. . Therefore, the stator 30, the inverter unit 51, and the capacitor unit 52 can be more easily cooled by the refrigerant flowing in the cooling flow passage 61.
　また、上述したように、本実施形態においてコンデンサ部５２は、仕切り壁部１０ｄに接触する。そのため、コンデンサ部５２の熱が、仕切り壁部１０ｄを伝って冷却流路６１内の冷媒に放出されやすい。したがって、冷却流路６１によってコンデンサ部５２をより冷却しやすい。 Further, as described above, in the present embodiment, the capacitor portion 52 contacts the partition wall portion 10d. Therefore, the heat of the condenser portion 52 is easily released to the refrigerant in the cooling flow passage 61 along the partition wall portion 10 d. Therefore, the condenser portion 52 can be more easily cooled by the cooling flow passage 61.
　仕切り壁部１０ｄのうち冷却流路６１とインバータ収容部１５との径方向の間に位置する部分１０ｊにおいて、冷却流路６１とインバータ部５１との径方向の間に位置する部分１０ｉは、冷却流路６１とコンデンサ部５２との径方向の間に位置する部分１０ｈよりも、径方向の寸法が小さい。すなわち、部分１０ｉの径方向の寸法Ｌ１は、部分１０ｈの径方向の寸法Ｌ３よりも小さい。これにより、冷却流路６１をインバータ部５１に近づけることができ、インバータ部５１をより冷却しやすい。 In the portion 10j of the partition wall portion 10d located between the cooling flow passage 61 and the inverter accommodation portion 15 in the radial direction, the portion 10i located between the cooling flow passage 61 and the inverter portion 51 in the radial direction The dimension in the radial direction is smaller than that of the portion 10 h positioned between the flow path 61 and the capacitor portion 52 in the radial direction. That is, the radial dimension L1 of the portion 10i is smaller than the radial dimension L3 of the portion 10h. As a result, the cooling flow passage 61 can be brought close to the inverter unit 51, and the inverter unit 51 can be cooled more easily.
　仕切り壁部１０ｄのうち冷却流路６１とインバータ収容部１５との径方向の間に位置する部分１０ｊは、仕切り壁部１０ｄのうち冷却流路６１とステータ収容部１４との径方向の間に位置する部分１０ｋよりも、径方向の寸法が小さい。すなわち、部分１０ｉの径方向の寸法Ｌ１および部分１０ｈの径方向の寸法Ｌ３は、部分１０ｋの径方向の寸法Ｌ２よりも小さい。これにより、冷却流路６１をステータ収容部１４よりもインバータ収容部１５に近づけることができ、インバータ収容部１５をより冷却しやすい。また、寸法Ｌ２を比較的大きくしやすいため、周壁部１０ｂのうちステータコア３１と接する部分の径方向の寸法を大きくしやすい。これにより、周壁部１０ｂにおけるステータコア３１を保持する強度を比較的大きくできる。以上のように、寸法Ｌ１と寸法Ｌ２と寸法Ｌ３とは、Ｌ１＜Ｌ３＜Ｌ２の関係を満たす。 The portion 10 j of the partition wall portion 10 d located between the cooling flow passage 61 and the inverter accommodation portion 15 in the radial direction is located between the cooling flow passage 61 and the stator accommodation portion 14 in the partition wall portion 10 d. The radial dimension is smaller than the located portion 10k. That is, the radial dimension L1 of the portion 10i and the radial dimension L3 of the portion 10h are smaller than the radial dimension L2 of the portion 10k. As a result, the cooling flow passage 61 can be made closer to the inverter accommodating portion 15 than the stator accommodating portion 14, and the inverter accommodating portion 15 can be more easily cooled. Further, since the dimension L2 can be relatively easily increased, the dimension in the radial direction of the portion of the circumferential wall portion 10b in contact with the stator core 31 can be easily increased. Thereby, the intensity | strength holding the stator core 31 in the surrounding wall part 10b can be comparatively enlarged. As described above, the dimension L1, the dimension L2, and the dimension L3 satisfy the relationship of L1 <L3 <L2.
　なお、上述した寸法Ｌ１と寸法Ｌ２と寸法Ｌ３との大小関係は、少なくとも各寸法の最小値同士の間において成り立てばよい。例えば、本実施形態では、寸法Ｌ１および寸法Ｌ２は周方向θの位置によって異なるが、寸法Ｌ１の最小値と寸法Ｌ２の最小値とを寸法Ｌ３と比べた際に、上述したＬ１＜Ｌ３＜Ｌ２の関係を満たせばよい。本実施形態では、寸法Ｌ１と寸法Ｌ２と寸法Ｌ３との大小関係は、仕切り壁部１０ｄにおける幅方向Ｘの中央部分において、Ｌ１＜Ｌ３＜Ｌ２の関係を満たす。 Note that the above-described magnitude relationship between the dimension L1, the dimension L2, and the dimension L3 may be established at least between the minimum values of the respective dimensions. For example, in the present embodiment, although the dimension L1 and the dimension L2 differ depending on the position in the circumferential direction θ, when the minimum value of the dimension L1 and the minimum value of the dimension L2 are compared with the dimension L3, L1 <L3 <L2 described above It suffices to satisfy the relationship. In the present embodiment, the magnitude relationship among the dimensions L1, L2, and L3 satisfies the relationship of L1 <L3 <L2 at the central portion in the width direction X of the partition wall 10d.
　図５に示すように、冷却流路６１の軸方向Ｙの寸法Ｌ４は、周方向θの位置によらず略均一である。図６に示すように、冷却流路６１の軸方向Ｙの寸法Ｌ４は、第１回路基板５１ａの軸方向Ｙの寸法Ｌ５および第２回路基板５１ｂの軸方向Ｙの寸法Ｌ６よりも大きい。そのため、冷却流路６１の軸方向Ｙの寸法Ｌ４を比較的大きくでき、１つの冷却流路６１によって冷却できる範囲を広くできる。また、冷却流路６１内に流れる冷媒の流量を大きくできる。したがって、冷却流路６１による冷却効率をより向上できる。第１回路基板５１ａの軸方向Ｙの寸法Ｌ５は、第２回路基板５１ｂの軸方向Ｙの寸法Ｌ６よりも小さい。すなわち、寸法Ｌ４と寸法Ｌ５と寸法Ｌ６とは、Ｌ５＜Ｌ６＜Ｌ４の関係を満たす。 As shown in FIG. 5, the dimension L4 in the axial direction Y of the cooling flow passage 61 is substantially uniform regardless of the position in the circumferential direction θ. As shown in FIG. 6, the dimension L4 in the axial direction Y of the cooling flow passage 61 is larger than the dimension L5 in the axial direction Y of the first circuit board 51a and the dimension L6 in the axial direction Y of the second circuit board 51b. Therefore, the dimension L4 in the axial direction Y of the cooling flow passage 61 can be made relatively large, and the range that can be cooled by one cooling flow passage 61 can be broadened. Further, the flow rate of the refrigerant flowing into the cooling flow passage 61 can be increased. Therefore, the cooling efficiency by the cooling channel 61 can be further improved. The dimension L5 in the axial direction Y of the first circuit board 51a is smaller than the dimension L6 in the axial direction Y of the second circuit board 51b. That is, the dimension L4, the dimension L5, and the dimension L6 satisfy the relationship of L5 <L6 <L4.
　冷却流路６１の軸方向Ｙの寸法Ｌ４は、コンデンサ部５２の軸方向Ｙの寸法よりも大きい。図４に示すように、本実施形態において冷却流路６１の軸方向Ｙの寸法Ｌ４は、第２回路基板５１ｂの幅方向Ｘの寸法およびコンデンサ部５２の幅方向Ｘの寸法よりも小さい。図示は省略するが、冷却流路６１の軸方向Ｙの寸法Ｌ４は、第１回路基板５１ａの幅方向Ｘの寸法よりも小さい。 The dimension L 4 in the axial direction Y of the cooling flow passage 61 is larger than the dimension in the axial direction Y of the condenser portion 52. As shown in FIG. 4, in the present embodiment, the dimension L4 in the axial direction Y of the cooling flow passage 61 is smaller than the dimension in the width direction X of the second circuit board 51 b and the dimension in the width direction X of the capacitor portion 52. Although not shown, the dimension L4 in the axial direction Y of the cooling flow passage 61 is smaller than the dimension in the width direction X of the first circuit board 51a.
　ここで、本実施形態によれば、上述したように、流入口６１ｂは、冷却流路６１の周方向一方側の端部における軸方向Ｙの中央に位置し、流出口６１ｃは、冷却流路６１の周方向他方側の端部における軸方向Ｙの中央に位置する。そのため、冷却流路６１の軸方向Ｙの寸法Ｌ４を比較的大きくした場合であっても、冷却流路６１内において冷媒が淀むことを抑制しやすく、流入口６１ｂから流出口６１ｃに向けて冷媒を流しやすい。したがって、冷却流路６１を流れる冷媒の圧力損失を低減できる。 Here, according to the present embodiment, as described above, the inflow port 61b is located at the center of the axial direction Y at the end on one circumferential side of the cooling flow path 61, and the outflow port 61c is the cooling flow path It is located at the center of the axial direction Y at the other end of the circumferential direction 61. Therefore, even when the dimension L4 in the axial direction Y of the cooling passage 61 is relatively large, stagnation of the refrigerant in the cooling passage 61 can be easily suppressed, and the refrigerant is directed from the inflow port 61b to the outflow port 61c. It is easy to flow Therefore, the pressure loss of the refrigerant flowing through the cooling channel 61 can be reduced.
　冷却流路６１の幅方向Ｘの最大寸法は、第２回路基板５１ｂの幅方向Ｘの寸法およびコンデンサ部５２の幅方向Ｘの寸法よりも大きい。また、図示は省略するが、冷却流路６１の幅方向Ｘの最大寸法は、第１回路基板５１ａの幅方向Ｘの寸法よりも大きい。そのため、冷却流路６１によって、インバータ部５１およびコンデンサ部５２をより冷却しやすい。冷却流路６１の幅方向Ｘの最大寸法とは、冷却流路６１において最も幅方向一方側に位置する部分と、冷却流路６１において最も幅方向他方側に位置する部分と、の間の幅方向Ｘの距離である。本実施形態において冷却流路６１の幅方向Ｘの最大寸法は、円弧状の冷却流路６１の外径に相当する。 The maximum dimension in the width direction X of the cooling flow passage 61 is larger than the dimension in the width direction X of the second circuit board 51 b and the dimension in the width direction X of the capacitor portion 52. Moreover, although illustration is abbreviate | omitted, the largest dimension of the width direction X of the cooling flow path 61 is larger than the dimension of the width direction X of the 1st circuit board 51a. Therefore, it is easier to cool the inverter unit 51 and the capacitor unit 52 by the cooling flow passage 61. The maximum dimension in the width direction X of the cooling flow channel 61 is the width between the portion located on the one side in the width direction in the cooling flow channel 61 and the portion located on the other side in the width direction on the cooling flow channel 61. It is the distance in the direction X. In the present embodiment, the maximum dimension of the cooling flow passage 61 in the width direction X corresponds to the outer diameter of the arc-shaped cooling flow passage 61.
　本実施形態において冷却部６０は、ハウジング１０が砂型鋳造によって作製される際に、冷却部６０の形状を有する砂型の部分によって成形される。図１および図２に示すように、ハウジング１０は、冷却部６０を成形する砂型を排出するための複数の排出孔部１９を有する。砂型鋳造によってハウジング１０を製造した後、排出孔部１９から冷却部６０を成形する砂型を排出する。排出孔部１９は、冷却部６０と繋がる。排出孔部１９には栓体８０が圧入される。栓体８０によって排出孔部１９が閉塞され、冷却部６０内の冷媒がハウジング１０の外部に漏れることを抑制できる。 In the present embodiment, the cooling unit 60 is formed by a portion of the sand mold having the shape of the cooling unit 60 when the housing 10 is manufactured by sand casting. As shown in FIGS. 1 and 2, the housing 10 has a plurality of discharge holes 19 for discharging a sand mold for forming the cooling unit 60. After the housing 10 is manufactured by sand casting, the sand mold for forming the cooling unit 60 is discharged from the discharge hole 19. The discharge hole 19 is connected to the cooling unit 60. The plug 80 is pressed into the discharge hole 19. The discharge hole 19 is closed by the plug 80, and the refrigerant in the cooling unit 60 can be prevented from leaking to the outside of the housing 10.
（第１実施形態の変形例）
　図７に示すように、本変形例のハウジング１１０において、仕切り壁部１１０ｄのうち冷却流路１６１とインバータ収容部１５との径方向の間に位置する部分１１０ｊにおいて、冷却流路１６１とコンデンサ部５２との径方向の間に位置する部分１１０ｈは、冷却流路１６１とインバータ部５１との径方向の間に位置する部分１１０ｉよりも、径方向の寸法が小さい。すなわち、部分１１０ｈの径方向の寸法Ｌ９は、部分１１０ｉの径方向の寸法Ｌ７よりも小さい。これにより、冷却流路１６１をコンデンサ部５２に近づけやすく、コンデンサ部５２をより冷却しやすい。本変形例においてコンデンサ部５２が接触する仕切り壁部１１０ｄの上面は、インバータ部５１が設置される仕切り壁部１１０ｄの上面よりも下側に位置する。 (Modification of the first embodiment)
As shown in FIG. 7, in the housing 110 of the present modification, the cooling flow passage 161 and the capacitor portion are provided in the portion 110 j of the partition wall portion 110 d located between the cooling flow passage 161 and the inverter accommodation portion 15 in the radial direction. The radial dimension of the portion 110 h positioned between the radial direction 52 and the radial direction is smaller than that of the portion 110 i positioned between the cooling flow path 161 and the inverter portion 51 in the radial direction. That is, the radial dimension L9 of the portion 110h is smaller than the radial dimension L7 of the portion 110i. As a result, the cooling flow passage 161 can be easily brought close to the condenser 52, and the condenser 52 can be cooled more easily. In the present modification, the upper surface of the partition wall portion 110d in contact with the capacitor portion 52 is located lower than the upper surface of the partition wall portion 110d on which the inverter portion 51 is installed.
　仕切り壁部１１０ｄのうち冷却流路１６１とステータ収容部１４との径方向の間に位置する部分１１０ｋは、仕切り壁部１１０ｄのうち冷却流路１６１とインバータ収容部１５との径方向の間に位置する部分１１０ｊよりも、径方向の寸法が小さい。すなわち、部分１１０ｋの径方向の寸法Ｌ８は、部分１１０ｉの径方向の寸法Ｌ７および部分１１０ｈの径方向の寸法Ｌ９よりも小さい。これにより、冷却流路１６１をインバータ収容部１５よりもステータ収容部１４に近づけることができ、ステータ収容部１４をより冷却しやすい。このように、寸法Ｌ７と寸法Ｌ８と寸法Ｌ９とは、Ｌ８＜Ｌ９＜Ｌ７の関係を満たす。 The portion 110 k of the partition wall portion 110 d located between the cooling flow passage 161 and the stator accommodation portion 14 in the radial direction is located between the cooling flow passage 161 and the inverter accommodation portion 15 in the partition wall portion 110 d. The radial dimension is smaller than that of the located portion 110 j. That is, the radial dimension L8 of the portion 110k is smaller than the radial dimension L7 of the portion 110i and the radial dimension L9 of the portion 110h. As a result, the cooling flow passage 161 can be made closer to the stator accommodation portion 14 than the inverter accommodation portion 15, and the stator accommodation portion 14 can be more easily cooled. Thus, the dimensions L7, L8, and L9 satisfy the relationship of L8 <L9 <L7.
＜第２実施形態＞
　図８に示すように、本実施形態の冷却部２６０において、冷却流路２６１の周方向一方側の端部は、周方向他方側から周方向一方側に向かうに従って軸方向Ｙの寸法が小さくなる第１縮小部２６１ｄである。第１縮小部２６１ｄは、流路本体部２６１ａの周方向一方側の端部である。冷却流路２６１の周方向他方側の端部は、周方向一方側から周方向他方側に向かうに従って軸方向Ｙの寸法が小さくなる第２縮小部２６１ｅである。第２縮小部２６１ｅは、流路本体部２６１ａの周方向他方側の端部である。 Second Embodiment
As shown in FIG. 8, in the cooling unit 260 of the present embodiment, the dimension of the end in the circumferential direction on one side of the cooling flow passage 261 decreases in the axial direction Y as going from the other side in the circumferential direction to the one side in the circumferential direction. This is the first reduction unit 261 d. The first reduction portion 261 d is an end on one circumferential side of the flow path main portion 261 a. The end on the other side in the circumferential direction of the cooling flow passage 261 is a second reduction portion 261e in which the dimension in the axial direction Y decreases as going from the one side in the circumferential direction to the other side in the circumferential direction. The second reduction portion 261 e is an end on the other side in the circumferential direction of the flow path main portion 261 a.
　本実施形態において流入口２６１ｂは、第１縮小部２６１ｄの周方向一方側の端部に位置する。これにより、流入口２６１ｂから流入する冷媒は、第１縮小部２６１ｄにおける軸方向Ｙの寸法が比較的小さい部分から冷却流路２６１に流入し、周方向他方側に進む。そのため、流入口２６１ｂから流入した冷媒が冷却流路２６１内で淀むことを抑制できる。また、第１縮小部２６１ｄの軸方向Ｙの寸法は、周方向他方側に向かうに従って大きくなるため、冷却流路２６１に流れる冷媒の流量を確保できる。 In the present embodiment, the inflow port 261 b is located at one end of the first reduction portion 261 d in the circumferential direction. Accordingly, the refrigerant flowing from the inflow port 261b flows into the cooling flow path 261 from a portion where the dimension of the first reduction portion 261d in the axial direction Y is relatively small, and proceeds to the other side in the circumferential direction. Therefore, it is possible to suppress that the refrigerant flowing from the inflow port 261 b stagnates in the cooling channel 261. Further, the dimension of the first reduction portion 261 d in the axial direction Y increases toward the other side in the circumferential direction, so that the flow rate of the refrigerant flowing in the cooling flow passage 261 can be secured.
　流出口２６１ｃは、第２縮小部２６１ｅの周方向他方側の端部に位置する。これにより、流出口２６１ｃから流出する冷媒は、第２縮小部２６１ｅにおける軸方向Ｙの寸法が比較的小さい部分から流出する。そのため、冷却流路２６１を流れる冷媒を流出口２６１ｃに向けて集めることができ、流出口２６１ｃの周辺部において冷媒が淀むことを抑制できる。 The outlet 261 c is located at the other end of the second reduction portion 261 e in the circumferential direction. As a result, the refrigerant flowing out of the outlet 261 c flows out from the portion of the second reduction portion 261 e in which the dimension in the axial direction Y is relatively small. Therefore, the refrigerant flowing through the cooling channel 261 can be collected toward the outlet 261 c, and stagnation of the refrigerant in the peripheral portion of the outlet 261 c can be suppressed.
　以上のように、本実施形態によれば、冷却流路２６１の軸方向Ｙの寸法を大きくしつつ、冷却流路２６１に流入する冷媒および冷却流路２６１から流出する冷媒が淀むことを抑制できる。したがって、冷却流路２６１によって冷却できる範囲を広くしつつ、冷媒の圧力損失を低減することができる。本実施形態において流入口２６１ｂと流出口２６１ｃとは、鉛直方向Ｚにおいて同じ位置に配置される。流入口２６１ｂと流出口２６１ｃとは、軸方向Ｙに間隔を空けて配置される。 As described above, according to the present embodiment, it is possible to suppress the stagnation of the refrigerant flowing into the cooling flow passage 261 and the refrigerant flowing out of the cooling flow passage 261 while increasing the size in the axial direction Y of the cooling flow passage 261 . Therefore, the pressure loss of the refrigerant can be reduced while widening the range that can be cooled by the cooling flow passage 261. In the present embodiment, the inlet 261 b and the outlet 261 c are disposed at the same position in the vertical direction Z. The inlet 261 b and the outlet 261 c are spaced apart in the axial direction Y.
　第１縮小部２６１ｄと第２縮小部２６１ｅとは、軸方向Ｙに沿って視て、互いに重なる。すなわち、冷却流路２６１の周方向一方側の端部と冷却流路２６１の周方向他方側の端部とは、軸方向Ｙに沿って視て、互いに重なる。そのため、冷却流路２６１によって、ステータ３０の径方向外側の全周を囲むことができ、ステータ３０をより冷却できる。第１縮小部２６１ｄは、第２縮小部２６１ｅの軸方向一方側に配置される。 The first reduction portion 261 d and the second reduction portion 261 e overlap with each other as viewed along the axial direction Y. That is, the end on one circumferential side of the cooling flow passage 261 and the end on the other circumferential side of the cooling flow passage 261 overlap each other when viewed along the axial direction Y. Therefore, the cooling passage 261 can surround the entire outer periphery of the stator 30 in the radial direction, and the stator 30 can be further cooled. The first reduction unit 261 d is disposed on one side in the axial direction of the second reduction unit 261 e.
　第１縮小部２６１ｄおよび第２縮小部２６１ｅは、冷却流路２６１における幅方向他方側の部分である。すなわち、冷却流路２６１のうち軸方向Ｙに沿って視て互いに重なる部分は、冷却流路２６１の幅方向他方側の部分である。そのため、本実施形態において冷却流路２６１のうち仕切り壁部１０ｄに設けられる部分は、冷却流路２６１のうち軸方向Ｙに沿って視て互いに重なる部分とは異なる部分である。したがって、冷却流路２６１のうち軸方向Ｙの寸法が比較的大きい部分を、仕切り壁部１０ｄに設けることができる。これにより、冷却流路２６１によってステータ３０およびインバータ部５１をより冷却しやすい。 The first reduction portion 261 d and the second reduction portion 261 e are portions on the other side in the width direction of the cooling channel 261. That is, a portion of the cooling flow channel 261 which overlaps with each other in the axial direction Y is a portion on the other side of the cooling flow channel 261 in the width direction. Therefore, in the present embodiment, the portion provided in the partition wall portion 10d of the cooling flow passage 261 is a portion different from the portion overlapping the cooling passage 261 when viewed along the axial direction Y. Therefore, it is possible to provide the partition wall portion 10d with a portion of the cooling flow passage 261 that has a relatively large dimension in the axial direction Y. Thus, the stator 30 and the inverter unit 51 can be more easily cooled by the cooling flow passage 261.
　本発明は上述の実施形態に限られず、他の構成を採用することもできる。冷却流路は、中心角φが１８０°以下の円弧状であってもよい。冷却流路の軸方向Ｙの寸法は、インバータ部における回路基板の軸方向Ｙの寸法より小さくてもよい。冷却流路の軸方向Ｙの寸法は、回路基板の幅方向Ｘの寸法およびコンデンサ部の幅方向Ｘの寸法より大きくてもよい。 The present invention is not limited to the above-described embodiment, and other configurations can be adopted. The cooling channel may have an arc shape with a central angle φ of 180 ° or less. The dimension of the cooling flow path in the axial direction Y may be smaller than the dimension of the circuit board in the inverter portion in the axial direction Y. The dimension in the axial direction Y of the cooling channel may be larger than the dimension in the width direction X of the circuit board and the dimension in the width direction X of the capacitor portion.
　冷却流路は、２つ以上設けられてもよい。この場合、冷却流路ごとに設けられる流入口および流出口も２つ以上ずつ設けられる。この場合、複数の冷却流路の径方向の寸法および軸方向Ｙの寸法は、互いに異なってもよいし、同じであってもよい。また、この場合、複数の冷却流路の形状は、互いに異なってもよいし、同じであってもよい。冷却流路のうち仕切り壁部に設けられる部分は、鉛直方向Ｚに沿って視て、インバータ部と重ならなくてもよいし、コンデンサ部と重ならなくてもよい。 Two or more cooling channels may be provided. In this case, two or more inlets and outlets provided for each cooling channel are also provided. In this case, the radial dimensions of the plurality of cooling channels and the dimensions in the axial direction Y may be different from each other or may be the same. Moreover, in this case, the shapes of the plurality of cooling channels may be different from each other or may be the same. The portion provided in the partition wall portion in the cooling flow path may not overlap with the inverter portion or may not overlap with the capacitor portion as viewed along the vertical direction Z.
　流入口は、冷却流路の周方向一方側の端部における軸方向Ｙの中央以外の位置に設けられてもよい。流出口は、冷却流路の周方向他方側の端部における軸方向Ｙの中央以外の位置に設けられてもよい。 The inlet may be provided at a position other than the center in the axial direction Y at an end on one circumferential side of the cooling channel. The outlet may be provided at a position other than the center in the axial direction Y at the other circumferential end of the cooling channel.
　上述した実施形態のモータの用途は、特に限定されない。上述した実施形態のモータは、例えば、車両に搭載される。また、上述した各構成は、相互に矛盾しない範囲内において、適宜組み合わせることができる。 The application of the motor of the embodiment described above is not particularly limited. The motor of the embodiment described above is mounted on, for example, a vehicle. Moreover, each structure mentioned above can be combined suitably in the range which does not contradiction mutually.
　本出願は、２０１７年７月２８日に出願された日本特許出願である特願２０１７－１４７１１５号に基づく優先権を主張し、当該日本特許出願に記載されたすべての記載内容を援用する。 This application claims priority based on Japanese Patent Application No. 201-147115, which is a Japanese patent application filed on Jul. 28, 2017, and incorporates the entire contents described in the Japanese patent application.
　１…モータ、１０，１１０…ハウジング、１０ｂ…周壁部、１０ｄ，１１０ｄ…仕切り壁部、１４…ステータ収容部、１５…インバータ収容部、２０…ロータ、２１…モータシャフト、３０…ステータ、５１…インバータ部、５１ａ…第１回路基板（回路基板）、５１ｂ…第２回路基板（回路基板）、５２…コンデンサ部、６１，１６１，２６１…冷却流路、６１ｂ，２６１ｂ…流入口、６１ｃ，２６１ｃ…流出口、２６１ｄ…第１縮小部、２６１ｅ…第２縮小部、Ｊ…中心軸、Ｙ…軸方向、Ｚ…鉛直方向（所定方向）、θ…周方向、φ…中心角

  DESCRIPTION OF SYMBOLS 1 ... Motor, 10, 110 ... Housing, 10b ... Peripheral wall part, 10d, 110d ... Partition wall part 14 ... Stator accommodating part, 15 ... Inverter accommodating part, 20 ... Rotor, 21 ... Motor shaft, 30 ... Stator, 51 ... Inverter part, 51a: first circuit board (circuit board), 51b: second circuit board (circuit board), 52: capacitor part, 61, 161, 261: cooling flow path, 61b, 261b: inlet, 61c, 261c ... outlet, 261d ... first reduction section, 261e ... second reduction section, J ... central axis, Y ... axial direction, Z ... vertical direction (predetermined direction), θ ... circumferential direction, φ ... central angle

Claims (11)

  1. 　一方向に延びる中心軸に沿って配置されるモータシャフトを有するロータと、
    　前記ロータと径方向に隙間を介して対向するステータと、
    　前記ステータと電気的に接続されるインバータ部と、
    　前記ステータを収容するステータ収容部および前記インバータ部を収容するインバータ収容部を有するハウジングと、
    　を備え、
    　前記インバータ収容部は、前記ステータ収容部の径方向外側に位置し、
    　前記ハウジングは、前記ロータおよび前記ステータの径方向外側において前記ロータおよび前記ステータを囲む筒状の周壁部を有し、かつ単一の部材であり、
    　前記周壁部は、
    　　冷却流路と、
    　　前記ステータ収容部と前記インバータ収容部とを仕切る仕切り壁部と、
    　を有し、
    　前記冷却流路は、冷媒が流入する流入口および前記冷媒が流出する流出口を有し、かつ、周方向に延び、
    　前記冷却流路の少なくとも一部は、前記仕切り壁部に設けられ、
    　前記冷却流路のうち前記仕切り壁部に設けられる部分は、前記ステータ収容部と前記インバータ部との径方向の間において単一層の流路である、モータ。     A rotor having a motor shaft disposed along a central axis extending in one direction;
    A stator that faces the rotor in the radial direction via a gap;
    An inverter unit electrically connected to the stator;
    A housing having a stator housing portion for housing the stator and an inverter housing portion for housing the inverter portion;
    Equipped with
    The inverter accommodating portion is located radially outward of the stator accommodating portion.
    The housing has a cylindrical peripheral wall surrounding the rotor and the stator radially outside the rotor and the stator, and is a single member.
    The peripheral wall portion is
    A cooling channel,
    A partition wall which partitions the stator housing portion and the inverter housing portion;
    Have
    The cooling channel has an inlet through which a refrigerant flows in and an outlet through which the refrigerant flows out, and extends circumferentially,
    At least a part of the cooling channel is provided in the partition wall portion,
    In the motor, a portion provided in the partition wall portion in the cooling flow path is a flow path of a single layer in a radial direction between the stator accommodation portion and the inverter portion.
  2. 　前記インバータ部は、回路基板を有し、
    　前記冷却流路の軸方向の寸法は、前記回路基板の軸方向の寸法よりも大きい、請求項１に記載のモータ。     The inverter unit has a circuit board,
    The motor according to claim 1, wherein an axial dimension of the cooling passage is larger than an axial dimension of the circuit board.
  3. 　前記流入口は、前記冷却流路の周方向一方側の端部における軸方向の中央に位置し、
    　前記流出口は、前記冷却流路の周方向他方側の端部における軸方向の中央に位置する、請求項１または２に記載のモータ。     The inlet is located at an axial center at one circumferential end of the cooling channel,
    The motor according to claim 1, wherein the outlet is located at an axial center at an end on the other circumferential side of the cooling channel.
  4. 　前記冷却流路は、中心角が１８０°よりも大きい円弧状である、請求項１から３のいずれか一項に記載のモータ。 The motor according to any one of claims 1 to 3, wherein the cooling channel is an arc having a central angle larger than 180 °.
  5. 　前記冷却流路の周方向一方側の端部は、周方向他方側から周方向一方側に向かうに従って軸方向の寸法が小さくなる第１縮小部であり、
    　前記冷却流路の周方向他方側の端部は、周方向一方側から周方向他方側に向かうに従って軸方向の寸法が小さくなる第２縮小部であり、
    　前記流入口は、前記第１縮小部の周方向一方側の端部に位置し、
    　前記流出口は、前記第２縮小部の周方向他方側の端部に位置する、請求項１から４のいずれか一項に記載のモータ。     The end on one side in the circumferential direction of the cooling flow passage is a first reduction portion in which the dimension in the axial direction decreases as going from the other side in the circumferential direction to the one side in the circumferential direction,
    The other circumferential end of the cooling channel is a second reduction portion in which the axial dimension decreases as going from one circumferential side to the other circumferential side,
    The inlet is located at one end of the first reduction portion in the circumferential direction,
    The motor according to any one of claims 1 to 4, wherein the outlet is located at the other end of the second reduction portion in the circumferential direction.
  6. 　前記冷却流路の周方向一方側の端部と前記冷却流路の周方向他方側の端部とは、軸方向に沿って視て、互いに重なる、請求項５に記載のモータ。 The motor according to claim 5, wherein an end on one circumferential side of the cooling channel and an end on the other circumferential side of the cooling channel overlap each other when viewed along the axial direction.
  7. 　前記冷却流路のうち前記仕切り壁部に設けられる部分は、前記冷却流路のうち軸方向に沿って視て互いに重なる部分とは異なる部分である、請求項６に記載のモータ。 The motor according to claim 6, wherein a portion of the cooling flow path provided in the partition wall portion is a portion different from a portion overlapping in the axial direction of the cooling flow path.
  8. 　前記インバータ部と電気的に接続されるコンデンサ部をさらに備え、
    　前記インバータ収容部は、軸方向と直交する所定方向において前記ステータ収容部の一方側に位置し、
    　前記所定方向に沿って視て、前記冷却流路のうち前記仕切り壁部に設けられる部分は、前記インバータ部と重なる部分と、前記コンデンサ部と重なる部分と、を有する、請求項１から７のいずれか一項に記載のモータ。     It further comprises a capacitor unit electrically connected to the inverter unit,
    The inverter accommodating portion is located on one side of the stator accommodating portion in a predetermined direction orthogonal to the axial direction.
    The portion provided on the partition wall portion of the cooling flow passage, as viewed along the predetermined direction, has a portion overlapping the inverter portion and a portion overlapping the capacitor portion. The motor according to any one of the preceding claims.
  9. 　前記仕切り壁部のうち前記冷却流路と前記インバータ収容部との径方向の間に位置する部分において、前記冷却流路と前記インバータ部との径方向の間に位置する部分は、前記冷却流路と前記コンデンサ部との径方向の間に位置する部分よりも、径方向の寸法が小さい、請求項８に記載のモータ。 In a portion of the partition wall portion located in the radial direction between the cooling flow path and the inverter accommodating portion, a portion located between the cooling flow path and the inverter portion in the radial direction is the cooling flow The motor according to claim 8, wherein the dimension in the radial direction is smaller than a portion located between the passage and the radial direction of the capacitor portion.
  10. 　前記仕切り壁部のうち前記冷却流路と前記インバータ収容部との径方向の間に位置する部分は、前記仕切り壁部のうち前記冷却流路と前記ステータ収容部との径方向の間に位置する部分よりも、径方向の寸法が小さい、請求項１から９のいずれか一項に記載のモータ。 The portion of the partition wall portion located between the cooling flow passage and the inverter accommodation portion in the radial direction is located between the cooling flow passage and the stator accommodation portion in the partition wall portion. The motor according to any one of claims 1 to 9, wherein the dimension in the radial direction is smaller than that of the portion.
  11. 　前記冷却流路を流れる前記冷媒は、周方向のうち一方の向きのみに流れる、請求項１から１０のいずれか一項に記載のモータ。

          The motor according to any one of claims 1 to 10, wherein the refrigerant flowing in the cooling flow passage flows in only one direction in a circumferential direction.

PCT/JP2018/027854 2017-07-28 2018-07-25 Motor WO2019022123A1 (en)

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JP2021151060A (en) * 2020-03-18 2021-09-27 東芝産業機器システム株式会社 Cooling structure of rotary electric machine and rotary electric machine
WO2022190183A1 (en) * 2021-03-08 2022-09-15 日産自動車株式会社 Rotating electrical machine

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JPH08103053A (en) * 1994-09-30 1996-04-16 Suzuki Motor Corp Cooler of motor
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WO2013069319A1 (en) * 2011-11-11 2013-05-16 株式会社安川電機 Rotating electrical machine and vehicle
JP2014140276A (en) * 2013-01-21 2014-07-31 Mitsubishi Electric Corp Liquid-cooled rotary electric machine
JP2015077019A (en) * 2013-10-10 2015-04-20 株式会社神戸製鋼所 Rotary drive device and construction machine having the same
JP2016073058A (en) * 2014-09-29 2016-05-09 株式会社神戸製鋼所 Inverter integrated motor

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JPH08103053A (en) * 1994-09-30 1996-04-16 Suzuki Motor Corp Cooler of motor
JP2011182480A (en) * 2010-02-26 2011-09-15 Hitachi Automotive Systems Ltd Rotary electric machine system
WO2013069319A1 (en) * 2011-11-11 2013-05-16 株式会社安川電機 Rotating electrical machine and vehicle
JP2014140276A (en) * 2013-01-21 2014-07-31 Mitsubishi Electric Corp Liquid-cooled rotary electric machine
JP2015077019A (en) * 2013-10-10 2015-04-20 株式会社神戸製鋼所 Rotary drive device and construction machine having the same
JP2016073058A (en) * 2014-09-29 2016-05-09 株式会社神戸製鋼所 Inverter integrated motor

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Publication number Priority date Publication date Assignee Title
JP2021151060A (en) * 2020-03-18 2021-09-27 東芝産業機器システム株式会社 Cooling structure of rotary electric machine and rotary electric machine
JP7410763B2 (en) 2020-03-18 2024-01-10 東芝産業機器システム株式会社 Cooling structure for rotating electrical machines, rotating electrical machines
WO2022190183A1 (en) * 2021-03-08 2022-09-15 日産自動車株式会社 Rotating electrical machine

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