WO2018179063A1 - 回転子、電動機、圧縮機、送風機、および空気調和装置 - Google Patents
回転子、電動機、圧縮機、送風機、および空気調和装置 Download PDFInfo
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- WO2018179063A1 WO2018179063A1 PCT/JP2017/012426 JP2017012426W WO2018179063A1 WO 2018179063 A1 WO2018179063 A1 WO 2018179063A1 JP 2017012426 W JP2017012426 W JP 2017012426W WO 2018179063 A1 WO2018179063 A1 WO 2018179063A1
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- Prior art keywords
- slit
- rotor
- magnet insertion
- radial direction
- insertion hole
- Prior art date
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
- H02K15/028—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots for fastening to casing or support, respectively to shaft or hub
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/26—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating armatures and stationary magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Definitions
- the present invention relates to a rotor, an electric motor, a compressor, a blower, and an air conditioner.
- the rotor of the electric motor has a rotor core composed of a laminate of electromagnetic steel sheets and a shaft that is a rotating shaft.
- the shaft is generally fixed to the inner periphery of the rotor core by shrink fitting (see, for example, Patent Document 1).
- JP 2008-22601 A (see paragraphs 0024 to 0032)
- the present invention has been made to solve the above-described problems, and an object thereof is to suppress demagnetization of a permanent magnet attached to a rotor.
- the rotor of the present invention has an annular inner periphery centered on the axis, and an outer periphery located outside the inner periphery in the radial direction centered on the axis, and a rotor core made of a magnetic steel sheet.
- the rotor core has a first magnet insertion hole and a second magnet insertion hole that are adjacent in the circumferential direction around the axis along the outer periphery, and are adjacent in the circumferential direction along the inner periphery. It has a first slit and a second slit.
- a first permanent magnet is disposed in the first magnet insertion hole
- a second permanent magnet is disposed in the second magnet insertion hole.
- the first slit has a first facing portion that faces the second slit
- the second slit has a second facing portion that faces the first slit.
- the first facing portion has a first inner end portion at an inner end portion in the radial direction, a first outer end portion at an outer end portion in the radial direction, and the second facing portion is A second inner end portion is provided at the inner end portion in the radial direction, and a second outer end portion is provided at the outer end portion in the radial direction.
- the rotor core includes a first straight line connecting the first inner end portion and the second inner peripheral portion between the first facing portion and the second facing portion, and a first outer end portion.
- the inter-slit portion is disposed radially inward with respect to the inter-electrode portion between the first magnet insertion hole and the second magnet insertion hole.
- the minimum radial distance from the inner circumference of the rotor core to the first slit and the second slit is D1
- the minimum radial width of the first slit and the second slit is W1
- the distance between the slits is If the length in the radial direction is W2, at least one of D1 ⁇ W1 and D1 ⁇ W2 is established.
- the width of the slit provided on the radially outer side of the region is larger than the region between the inner periphery of the rotor core and the slit. Heat is difficult to be transmitted to. As a result, demagnetization of the permanent magnet due to heat can be suppressed. Further, when D1 ⁇ W2 is established, the heat path passing through the slit portion becomes long, so that it is difficult for heat to be transmitted to the magnet insertion hole. As a result, demagnetization of the permanent magnet due to heat can be suppressed.
- FIG. 1 is a transverse sectional view showing an electric motor according to a first embodiment.
- FIG. 3 is a transverse sectional view showing the rotor according to the first embodiment.
- FIG. 3 is an enlarged view showing a part of the rotor core according to the first embodiment. It is the figure (A) which expands and shows a part of rotor core of Embodiment 1, and the schematic diagram (B) which shows the part between slits.
- FIG. 3 is a longitudinal sectional view showing the rotor according to the first embodiment.
- FIG. 3 is a plan view showing an end plate of the rotor according to the first embodiment.
- 4 is a graph showing a relationship between a dimensional ratio W1 / D1 and a permanent magnet temperature in the rotor of the first embodiment.
- FIG. 4 is a graph showing a relationship between a dimensional ratio W2 / D1 and a permanent magnet temperature in the rotor according to the first embodiment.
- 6 is a graph showing a relationship between a circumferential width S1 of a slit and a permanent magnet temperature in the rotor of the first embodiment.
- 6 is a graph showing the relationship between the distance G1 from the air hole to the slit and the permanent magnet temperature in the rotor of the first embodiment.
- FIG. 6 is a transverse sectional view showing a rotor according to a second embodiment.
- FIG. 6 is a transverse sectional view showing a rotor according to a third embodiment.
- FIG. 10 is a longitudinal sectional view showing a rotor according to a fourth embodiment.
- FIG. 6 is a transverse sectional view showing a rotor according to a fourth embodiment.
- FIG. 10 is a plan view showing an end plate of a rotor according to a fifth embodiment.
- FIG. 10 is a plan view showing an end plate of a rotor according to a modification of the fifth embodiment.
- It is a longitudinal cross-sectional view which shows the rotary compressor which can apply the electric motor of each embodiment.
- It is a figure which shows the refrigerating-cycle apparatus provided with the compressor of FIG.
- It is a figure which shows the air conditioning apparatus provided with the air blower which can apply the electric motor of each embodiment.
- It is the front view (A) and sectional drawing (B) which show the outdoor unit of the air conditioning apparatus of FIG.
- FIG. 1 is a cross-sectional view showing electric motor 100 of the first embodiment.
- the electric motor 100 is a brushless DC motor, and its rotation is controlled by frequency control of a control device having an inverter.
- the electric motor 100 is an inner rotor type electric motor including a cylindrical rotor 1 and an annular stator 5 provided so as to surround the rotor 1. An air gap of 0.5 mm, for example, is provided between the stator 5 and the rotor 1.
- This electric motor 100 is a permanent magnet embedded type electric motor in which a permanent magnet 2 is embedded in a rotor 1.
- the rotation axis of the rotor 1 is referred to as an axis C1, and the direction of the axis C1 is referred to as an “axial direction”.
- a direction along the circumference centered on the axis C1 (indicated by an arrow R1 in FIG. 1) is referred to as “circumferential direction”, and a radial direction centered on the axis C1 is referred to as “radial direction”.
- the transverse sectional view is a sectional view in a plane orthogonal to the axis C1
- the longitudinal sectional view is a sectional view in a plane parallel to the axis C1 (a plane including the axis C1).
- the stator 5 is provided outside the rotor 1 in the radial direction so as to surround the rotor 1.
- the stator 5 has a stator core 50 and a coil 55 wound around the stator core 50.
- the stator core 50 is formed by laminating a plurality of electromagnetic steel plates in the axial direction and fixing them by caulking or the like.
- the thickness of the electrical steel sheet is in the range of 0.1 to 1.0 mm, for example, 0.35 mm.
- the stator core 50 includes a yoke 51 extending in the circumferential direction around the axis C1 and a plurality of teeth 52 extending radially inward from the yoke 51 (toward the axis C1).
- the teeth 52 are arrange
- the distal end surface on the radially inner side of the teeth 52 faces the outer peripheral surface of the rotor 1 through the air gap described above. Between adjacent teeth 52, a slot which is a space for accommodating the coil 55 is formed.
- the number of teeth 52 (that is, the number of slots) is nine here, the number of teeth 52 is arbitrary.
- An insulator (insulating part) 53 is attached to the stator core 50.
- the insulator 53 is interposed between the stator core 50 and the coil 55 and insulates the stator core 50 and the coil 55 from each other.
- the insulator 53 is formed by molding a resin integrally with the stator core 50 or assembling a resin molded body molded as a separate part to the stator core 50.
- the coil 55 is made of a material such as copper or aluminum, and is wound around the tooth 52 via the insulator 53.
- the coil 55 may be wound around each tooth 52 (concentrated winding) or may be wound across a plurality of teeth 52 (distributed winding).
- FIG. 2 is a cross-sectional view showing the rotor 1.
- the rotor 1 has a cylindrical rotor core 10 centered on the axis C1.
- the rotor core 10 is formed by laminating a plurality of electromagnetic steel plates in the axial direction and fixing them by caulking or the like.
- the thickness of the electrical steel sheet is in the range of 0.1 to 1.0 mm, for example, 0.35 mm.
- the rotor core 10 has an inner periphery 13 and an outer periphery 19. Both the inner periphery 13 and the outer periphery 19 are annular (circular shape) centering on the axis C1.
- the inner periphery 13 defines a shaft hole (shaft insertion hole) in which the shaft 3 is fixed by shrink fitting.
- the shaft 3 is made of metal, for example.
- a plurality (first number) of magnet insertion holes 11 are formed along the outer periphery 19 of the rotor core 10.
- six magnet insertion holes 11 are arranged at equal intervals in the circumferential direction, but the number of magnet insertion holes 11 is arbitrary.
- the plate-like permanent magnet 2 is inserted into the magnet insertion hole 11.
- the number of magnet insertion holes 11 is six
- the number of permanent magnets 2 is also six. That is, the number of poles of the rotor 1 is six.
- the number of poles is not limited to six and is arbitrary.
- the permanent magnet 2 has a width in the circumferential direction of the rotor core 10 and a thickness in the radial direction.
- the permanent magnet 2 is composed of, for example, a neodymium rare earth magnet including iron (Fe), neodymium (Nd), and boron (B). Moreover, dysprosium (Dy) is added as needed.
- the permanent magnet 2 is magnetized in the thickness direction (the radial direction of the rotor 1).
- the permanent magnet 2 arranged in the magnet insertion hole 11 constitutes a magnetic pole.
- the circumferential center of the magnet insertion hole 11 (that is, the circumferential center of the permanent magnet 2) is the pole center P1.
- an inter-electrode portion P2 is formed between adjacent magnet insertion holes 11.
- one permanent magnet 2 is arranged in one magnet insertion hole 11, but a plurality of permanent magnets 2 may be arranged in the circumferential direction in one magnet insertion hole 11.
- the plurality of permanent magnets 2 in the same magnet insertion hole 11 are magnetized such that the same poles are directed radially outward.
- the magnet insertion hole 11 is extended linearly here, it may be extended in V shape, for example.
- a flux barrier (leakage magnetic flux suppression hole) 12 is formed so as to be connected to both ends in the circumferential direction of the magnet insertion hole 11.
- the flux barrier 12 suppresses leakage magnetic flux between adjacent permanent magnets 2.
- the core portion between the flux barrier 12 and the outer periphery of the rotor core 10 is a thin portion in order to suppress a short circuit of magnetic flux between adjacent permanent magnets 2.
- the thickness of the thin portion is preferably the same as the thickness of the electromagnetic steel sheet constituting the rotor core 10.
- a plurality of slits 15 are formed along the inner periphery 13 of the rotor core 10.
- the number of slits 15 is the same as the number of poles.
- the number of slits 15 is not limited to the same number as the number of poles, but is desirably a number obtained by dividing the number of poles by N (natural number) as described later.
- one slit 15 is formed radially inward with respect to one magnet insertion hole 11.
- the slit 15 extends in the circumferential direction around the axis C1.
- the circumferential center of the slit 15 and the circumferential center of the magnet insertion hole 11 are at the same position in the circumferential direction.
- the slit 15 may extend, for example, in a straight line as long as it has a length in the circumferential direction.
- FIG. 3 is an enlarged view showing a part of the rotor core 10 of the first embodiment.
- the slit 15 has an inner peripheral edge 15 a that faces the inner periphery 13 of the rotor core 10, and an outer peripheral edge 15 b that is positioned radially outward from the inner peripheral edge 15 a. Both the inner peripheral edge 15a and the outer peripheral edge 15b extend in the circumferential direction around the axis C1.
- the minimum radial distance from the inner periphery 13 of the rotor core 10 to the inner periphery 15a of the slit 15 is defined as a distance D1.
- the radial distance from the inner periphery 13 of the rotor core 10 to the inner peripheral edge 15 a of the slit 15 is constant in one slit 15, and the same is true for a plurality of slits 15. is there.
- the radial distance from the inner periphery 13 of the rotor core 10 to the inner periphery 15 a of the slit 15 may not be constant within one slit 15, and may be different among the plurality of slits 15.
- the minimum width in the radial direction of the slit 15 (that is, the minimum radial distance between the inner peripheral edge 15a and the outer peripheral edge 15b) is defined as a width W1.
- the width in the radial direction of the slit 15 is constant except for an air gap 15 d described later, and the slits 15 are also the same as each other.
- the width of the slit 15 in the radial direction may not be constant within one slit 15, and may be different among the plurality of slits 15.
- the radial distance (minimum distance) D1 from the inner periphery 13 of the rotor core 10 to the slit 15 and the radial width (minimum width) W1 of the slit 15 satisfy D1 ⁇ W1. Satisfy the relationship. This is because, as will be described later, by increasing the width of the slit 15, when the shaft 3 is shrink-fitted into the inner periphery 13 of the rotor core 10, heat is hardly transmitted to the outer periphery 19 side of the rotor core 10. It is.
- Opposite portions 15 c are formed at both ends of the slit 15 in the circumferential direction.
- the facing portion 15c is a portion where adjacent slits 15 face each other in the circumferential direction. That is, the facing portion 15c (first facing portion) of the slit 15 (first slit) located in the center in FIG. 3 and the facing portion 15c (first slit) located on the right side in FIG. 2nd opposing part) mutually opposes in the circumferential direction.
- FIG. 4A is an enlarged view showing a portion corresponding to the inter-pole portion P ⁇ b> 2 of the rotor core 10.
- FIG. 4B is an enlarged view showing a portion between adjacent slits 15. As shown in FIG. 4A, the radially inner end of the facing portion 15 c is referred to as an inner end 21. Similarly, the radially outer end of the facing portion 15 c is referred to as an outer end 22.
- the facing portion 15c of the slit 15 has a portion extending linearly from the inner periphery 13 toward the outer periphery 19, and an arcuate curved portion A1 is provided on the radially inner side thereof. And has an arcuate curved portion A2 on the radially outer side.
- the inner end portion 21 is a contact point between the curved portion A1 and the inner peripheral edge 15a.
- the outer end 22 is a contact point between the curved portion A2 and the outer peripheral edge 15b.
- a straight line connecting the inner end portions 21 of the facing portions 15 c of the adjacent slits 15 is referred to as a first straight line 23.
- a straight line connecting the outer end portions 22 of the facing portions 15 c of the adjacent slits 15 is referred to as a second straight line 24.
- the inner end portion 21 (first inner end portion) of the facing portion 15c (first facing portion) of the slit 15 (first slit) located on the left side is located on the right side.
- a straight line connecting the inner end 21 (second inner end) of the facing portion 15c (second facing portion) of the slit 15 (second slit) is referred to as a first straight line 23.
- a straight line connecting the outer end 22 (second outer end) of the facing portion 15c (second facing portion) of the slit 15 (second slit) is referred to as a second straight line 24.
- a region defined by the first straight line 23 and the second straight line 24 between the facing portions 15 c of the adjacent slits 15 is referred to as an inter-slit portion 16.
- the slit-to-slit portion 16 is a region where both ends in the circumferential direction are defined by the facing portions 15 c of the two slits 15 and both ends in the radial direction are defined by the first straight line 23 and the second straight line 24.
- both ends in the radial direction of the inter-slit portion 16 are defined by the first straight line 23 and the second straight line 24, but instead of the first straight line 23, the circumference connecting the inner end portions 21 to each other.
- a direction curve may be used, and a circumferential curve connecting the outer end portions 22 may be used instead of the second straight line 24.
- the inter-slit portion 16 is located on the radially inner side of the inter-pole portion P2 of the rotor 1. More specifically, the circumferential position of the inter-slit portion 16 coincides with the circumferential position of the inter-pole portion P ⁇ b> 2 of the rotor 1.
- the inter-slit portion 16 is a portion that becomes a path through which heat is transferred from the inner periphery 13 toward the outer periphery 19 when the shaft 3 is shrink-fitted into the shaft hole of the rotor core 10.
- the length in the radial direction of the inter-slit portion 16 (that is, the radial distance between the first straight line 23 and the second straight line 24) is defined as a length W2.
- the radial width W1 of the slit 15 and the radial length W2 of the inter-slit portion 16 are the same, but may be different from each other.
- the radial length W2 of the inter-slit portion 16 is larger than the radial distance D1 from the inner periphery 13 of the rotor core 10 to the slit 15 (D1 ⁇ W2).
- the minimum width in the circumferential direction of the inter-slit portion 16 is defined as a width S1.
- the width S1 is equal to or greater than the plate thickness of the electromagnetic steel plate constituting the rotor core 10, and is smaller than twice the plate thickness.
- the plate thickness means the thickness of one electromagnetic steel plate.
- the air hole 14 which is a space
- the air hole 14 is a space formed so as to penetrate the rotor core 10 in the axial direction.
- the air holes 14 function as holes for allowing fluid to pass through or holes for inserting rivets.
- the fluid is air when the electric motor 100 is used for a blower, and is a refrigerant when used for a compressor.
- the air hole 14 has a circular cross section here, but is not limited to a circular shape, and may be, for example, a rectangle.
- the air hole 14 is disposed on the radially outer side of the slit-to-slit portion 16. More specifically, the inter-slit portion 16, the air hole 14, and the inter-pole portion P2 are aligned in a row in the radial direction.
- the minimum distance from the slit 15 to the air hole 14 is defined as a distance G1.
- the distance G1 is equal to or greater than the plate thickness of the electromagnetic steel plate constituting the rotor core 10 and is smaller than twice the plate thickness.
- the slit 15 has a gap 15 d extending in the radial direction toward the magnet insertion hole 11.
- the gap portion 15 d extends from the circumferential center portion of the outer peripheral edge 15 b toward the circumferential center portion of the magnet insertion hole 11.
- the minimum distance between the gap 15d and the magnet insertion hole 11 is defined as a distance D2.
- the distance D2 is the distance between the edge 15e facing the magnet insertion hole 11 of the gap 15d and the magnet insertion hole 11.
- the distance D2 is equal to or greater than the thickness of the electromagnetic steel sheet forming the rotor core 10, and is smaller than twice the thickness.
- FIG. 5 is a longitudinal sectional view showing the rotor 1.
- the rotor 1 includes a rotor core 10 that is a laminated body in which a plurality (fourth number) of electromagnetic steel plates 101 are laminated in the axial direction, a shaft 3 that penetrates the shaft hole of the rotor core 10, and the rotor core 10. And a pair of end plates 4 provided so as to be sandwiched from both ends in the axial direction.
- the shaft 3 is fitted to the inner periphery 13 of all the electromagnetic steel sheets 101 constituting the rotor core 10.
- the end plate 4 prevents the permanent magnet 2 in the magnet insertion hole 11 from falling off.
- a rivet 31 is provided so as to penetrate the rotor core 10 and the end plate 4, and the end plate 4 is fixed to the rotor core 10 by the rivet 31.
- the rivet 31 is inserted into the air hole 14 (FIG. 3) of the rotor core 10.
- holes for inserting the rivets 31 may be formed in the rotor core 10.
- FIG. 6 is a plan view showing the end plate 4.
- the end plate 4 includes an annular inner periphery 43 and an outer periphery 49 centered on the axis C ⁇ b> 1, a plurality of slits 45 formed along the inner periphery 43, and an air hole formed radially outside the slit 45. 44.
- the shapes and dimensions of the inner periphery 43 and the outer periphery 49 of the end plate 4 correspond to the shapes and dimensions of the inner periphery 13 and the outer periphery 19 of the rotor core 10, respectively, but may not be exactly the same.
- the inner periphery 43 of the end plate 4 is formed larger than the inner periphery 13 of the rotor core 10.
- the shapes and dimensions of the slits 45 and the air holes 44 of the end plate 4 correspond to the shapes and dimensions of the slits 15 and the air holes 14 of the rotor core 10, respectively, but may not be exactly the same.
- the end plate 4 does not have a gap in a portion corresponding to the magnet insertion hole 11 of the rotor core 10. This is to prevent the permanent magnet 2 from falling off from the magnet insertion hole 11.
- the permanent magnet 2 is inserted into the magnet insertion hole 11 of the rotor core 10.
- the permanent magnet 2 is fixed in the magnet insertion hole 11 by clearance fitting.
- end plates 4 are attached to both ends of the rotor core 10 in the axial direction, and the rotor core 10 and the end plates 4 are fixed by rivets 31.
- the shaft 3 is fixed to the shaft hole defined by the inner periphery 13 of the rotor core 10 by shrink fitting.
- the rotor core 10 is heated by induction heating (IH) from the inner peripheral side 13 to thermally expand the rotor core 10 and expand the inner diameter of the shaft hole.
- IH induction heating
- the rotor core 10 After inserting the shaft 3 into the shaft hole, the rotor core 10 is cooled in a normal temperature or low temperature environment. As a result, the inner diameter of the shaft hole of the rotor core 10 is reduced, and the shaft 3 is fitted into the shaft hole. Thereby, the rotor core 10 and the shaft 3 are fixed integrally.
- the heat applied from the inner periphery 13 side of the rotor core 10 is also transmitted to the permanent magnet 2 in the magnet insertion hole 11.
- the characteristics of the permanent magnet 2 deteriorate.
- the magnetized permanent magnet 2 demagnetization occurs and the magnetic force decreases.
- the performance and quality of the permanent magnet 2 are deteriorated.
- positioned in the magnet insertion hole 11 is demonstrated.
- the shrink fitting of the shaft 3 is generally performed in a state where the rotor 1 is not incorporated inside the stator 5. In this state, compared to the state in which the rotor 1 is incorporated inside the stator 5 (FIG. 1), the gap portion of the magnetic circuit is larger, so the permeance of the permanent magnet 2 is reduced and demagnetization is likely to occur. .
- the temperature of the permanent magnet 2 in the shrink-fitting process is preferably suppressed to 100 to 140 ° C. or less, particularly preferably 100 ° C. or less.
- the gap is made as large as possible in the region from the inner periphery 13 of the rotor core 10 to the magnet insertion hole 11.
- the heat path from the inner periphery 13 of the rotor core 10 to the magnet insertion hole 11 is made as long as possible in the radial direction.
- the heat path from the inner periphery 13 of the rotor core 10 to the magnet insertion hole 11 is made as narrow as possible in the circumferential direction.
- a plurality of slits 15 are provided along the inner periphery 13 of the rotor core 10, and the diameter of the slit 15 is larger than the radial distance (minimum distance) D 1 from the inner periphery 13 to the slit 15. This is realized by increasing the direction width (minimum width) W1 (D1 ⁇ W1).
- the state in which the inner diameter of the shaft hole is enlarged is maintained until the insertion of the shaft 3 is completed after the rotor core 10 is heated from the inner periphery 13 side.
- An area that can store enough heat is needed.
- the radial distance D1 from the inner periphery 13 of the rotor core 10 to the slit 15 is determined so as to ensure a region for storing this heat.
- the radial width (minimum width) W1 of the slit 15 is set to the diameter from the inner periphery 13 to the slit 15. It is larger than the direction distance D1.
- the above configuration (2) is realized by disposing the inter-slit portion 16 serving as a heat path on the radially inner side of the inter-electrode portion P2. If the slit-to-slit portion 16 is arranged on the radially inner side of the inter-pole portion P2, the heat path from the inner periphery 13 of the rotor core 10 to the magnet insertion hole 11 is detoured and lengthened. Can be difficult to communicate.
- the radial length W2 of the inter-slit portion 16 is made larger than the radial distance D1 from the inner periphery 13 to the slit 15 (D1 ⁇ W2). While ensuring the area
- FIG. 7 shows the relationship between the ratio of the radial width W1 of the slit 15 to the distance D1 from the inner periphery 13 of the rotor core 10 to the slit 15 (referred to as the dimensional ratio W1 / D1) and the temperature of the permanent magnet 2. It is a graph to show. The horizontal axis indicates the dimensional ratio W1 / D1, and the vertical axis indicates the temperature of the permanent magnet 2.
- the dimension ratio W1 / D1 is larger than 1, that is, when the radial width W1 of the slit 15 is larger than the distance D1 from the inner periphery 13 of the rotor core 10 to the slit 15 (D1 ⁇ W1). It can be seen that the effect of suppressing the temperature of the permanent magnet 2 is high. Furthermore, when the dimensional ratio W1 / D1 is larger than 0.95, it can be seen that the temperature of the permanent magnet 2 can be suppressed to 100 ° C. or less.
- FIG. 8 shows the ratio of the radial length W2 of the inter-slit portion 16 to the distance D1 from the inner periphery 13 of the rotor core 10 to the slit 15 (referred to as a dimensional ratio W2 / D1), the temperature of the permanent magnet 2 It is a graph which shows the relationship.
- the horizontal axis indicates the dimensional ratio W2 / D1
- the vertical axis indicates the temperature of the permanent magnet 2.
- the temperature of the permanent magnet 2 decreases as the dimensional ratio W2 / D1 increases.
- the temperature of the permanent magnet 2 decreases as the radial length W2 of the inter-slit portion 16 increases with respect to the distance D1 from the inner periphery 13 of the rotor core 10 to the slit 15.
- the dimensional ratio W2 / D1 is greater than 1, that is, when the radial length W2 of the inter-slit portion 16 is greater than the distance D1 from the inner periphery 13 of the rotor core 10 to the slit 15 (D1 ⁇ It can be seen that the effect of suppressing the temperature of the permanent magnet 2 is high in (W2). Furthermore, when the dimensional ratio W2 / D1 is larger than 0.95, it can be seen that the temperature of the permanent magnet 2 can be suppressed to 100 ° C. or less.
- the radial width W1 of the slit 15 is made larger than the distance D1 from the inner periphery 13 of the rotor core 10 to the slit 15 (D1 ⁇ W1), and the slit
- the temperature of the permanent magnet 2 can be effectively suppressed by making the radial length W2 of the intermediate portion 16 larger than the distance D1 from the inner periphery 13 of the rotor core 10 to the slit 15 (D1 ⁇ W2). I understand.
- the above configuration (3) is realized by making the circumferential width (minimum width) S1 of the inter-slit portion 16 as small as possible.
- the width (minimum width) S1 in the circumferential direction of the inter-slit portion 16 is equal to or greater than the thickness of the electrical steel sheet constituting the rotor core 10 so as to be as small as possible within the range that can be punched.
- the width is set to be smaller than twice.
- FIG. 9 is a graph showing the relationship between the circumferential width S 1 of the slit-to-slit portion 16 and the temperature of the permanent magnet 2.
- the horizontal axis indicates the circumferential width S1 of the inter-slit portion 16, and the vertical axis indicates the temperature of the permanent magnet 2.
- the temperature of the permanent magnet 2 can be suppressed to 100 ° C. or lower when the circumferential width S1 of the inter-slit portion 16 is smaller than 0.55 mm.
- the rotor core 10 is compared with the case where the air hole 14 is formed on the radially inner side or the inter-slit portion 16 with respect to the slit 15. Both the radial distance D1 from the inner periphery 13 to the slit 15 and the circumferential width S1 of the inter-slit portion 16 can be reduced.
- the air hole 14 is formed on the radially outer side of the inter-slit portion 16 (in other words, the radially inner side of the inter-pole portion P2), the heat directed toward the outer periphery 19 side of the rotor core 10 is Therefore, the heat path from the inner periphery 13 to the outer periphery 19 of the rotor core 10 can be further narrowed.
- the distance G1 between the air hole 14 and the slit 15 is as small as possible.
- the distance G1 between the air hole 14 and the slit 15 is equal to or larger than the thickness of the electromagnetic steel sheet constituting the rotor core 10 and more than twice the thickness so that the distance G1 is as small as possible within the range where punching is possible. It is set to a small distance.
- FIG. 10 is a graph showing the relationship between the distance G1 between the air hole 14 and the slit 15 and the temperature of the permanent magnet 2.
- the distance G1 between the air hole 14 and the slit 15 is shown, and the vertical axis shows the temperature of the permanent magnet 2.
- the temperature of the permanent magnet 2 can be suppressed to 100 ° C. or less.
- the rate of change is gentler than in FIG. This is because when the distance G1 between the air hole 14 and the slit 15 is reduced, the heat path is only narrowed at one place, whereas the width in the circumferential direction of the slit-to-slit portion 16 as shown in FIG. This is because when S1 is reduced, a narrow heat path (that is, the slit-to-slit portion 16) continues in the radial direction by the distance W2, so that the effect of suppressing heat transfer to the magnet insertion hole 11 is great.
- the permanent magnet 2 does not contain dysprosium, or the content thereof is 2% by weight or less, and the rotor 1 is not incorporated in the stator 5 (that is, the permeance of the permanent magnet 2 is Even in the lowered state), the demagnetization of the permanent magnet 2 can be suppressed.
- the rivet 31 (FIG. 5) is inserted into the air hole 14, the rivet 31 is made of metal, so that heat may be transmitted through the rivet 31. Therefore, in the configuration in which the plurality of air holes 14 face one magnet insertion hole 11, heat is easily transmitted to the magnet insertion hole 11.
- the number of air holes 14 is the same as the number of magnet insertion holes 11, one air hole 14 faces one magnet insertion hole 11. Therefore, even if the rivets 31 are inserted through all the air holes 14, it is difficult for heat to be transmitted to the magnet insertion holes 11 as compared with the configuration in which the plurality of air holes 14 face one magnet insertion hole 11.
- the number of slits 15 is larger than the number of poles (that is, the number of magnet insertion holes 11), the number of inter-slit portions 16 increases, and the heat path increases.
- the number of slits 15 is the same as the number of poles, the number of inter-slit portions 16 serving as a heat path can be reduced, and heat can be hardly transmitted to the magnet insertion hole 11. .
- the radius of curvature of the curved portion A1 including the inner end portion 21 and the curved portion A2 including the outer end portion 22 is as small as possible. It is desirable that the thickness is equal to or less than the thickness of the electromagnetic steel sheet to be configured.
- the radii of curvature of the curved portions A1 and A2 of the facing portion 15c of the slit 15 are preferably equal to or less than the thickness of the electromagnetic steel sheet, and at least, a size that does not cause chipping of the die for punching. Specifically, it is desirable that it is 0.1 mm or more.
- a temperature distribution along the inner periphery 13 of the rotor core 10 is also generated. That is, the heat at the circumferential end portion of the slit 15 moves from the inter-slit portion 16 to the outer peripheral side, whereas the heat at the central portion in the circumferential direction of the slit 15 moves little, so the central portion in the circumferential direction of the slit 15 Temperature tends to be high.
- the radial width of the slit 15 is locally increased at the central portion in the circumferential direction. ing.
- one slit 15 has a gap portion 15d (first gap portion), and a slit 15 (second slit) adjacent in the circumferential direction has a gap portion 15d. (Second void).
- the distance (minimum distance) D2 between the gap 15d and the magnet insertion hole 11 is desirably as small as possible.
- the distance D2 between the gap portion 15d and the magnet insertion hole 11 is equal to or greater than the thickness of the electromagnetic steel sheet constituting the rotor core 10 and is equal to 2 of the thickness so that the distance D2 is as small as possible within the range where punching is possible.
- the distance is set smaller than twice.
- the distance from the axis C 1 to the inner periphery 13 of the rotor core 10 is the distance L 1, and the minimum distance from the inner periphery 13 of the rotor core 10 to the magnet insertion hole 11.
- L1 is L2 or more (that is, L1 ⁇ L2).
- the rotor core 10 has the magnet insertion holes 11 (the first magnet insertion hole and the second magnet insertion hole adjacent to each other in the circumferential direction along the outer periphery 19. ) And a plurality of slits 15 (first slit and second slit) adjacent in the circumferential direction along the inner periphery 13.
- Each slit 15 has a facing portion 15 c (a first facing portion and a second facing portion) facing the adjacent slit 15.
- Each facing portion 15c has an inner end 21 (first inner end and second inner end) and an outer end 22 (first outer end and second outer end).
- the rotor core 10 includes inner end portions 21 (first inner end portion and second inner end portion) between opposed portions 15c (first opposed portion and second opposed portion) facing each other. It has an inter-slit portion 16 defined by a straight line 23 that connects and a straight line 24 that connects the outer end portions 22 (the first outer end portion and the second outer end portion).
- the inter-slit portion 16 is disposed on the inner side in the radial direction with respect to the inter-electrode portion P ⁇ b> 2 between the adjacent magnet insertion holes 11.
- each slit 15 When the minimum radial distance from the inner periphery 13 of the rotor core 10 to each slit 15 is D1, the minimum radial width of each slit 15 is W1, and the radial length of the inter-slit portion 16 is W2. , At least one of D1 ⁇ W1 and D1 ⁇ W2 is established.
- the circumferential width (minimum width) S1 of the inter-slit portion 16 is equal to or greater than the thickness of the electromagnetic steel plate constituting the rotor core 10, and is smaller than twice the plate thickness, The heat path from the circumference 13 toward the outer circumference 19 can be narrowed. Thereby, it becomes difficult to transmit heat to the magnet insertion hole 11, and the effect of suppressing the heating of the permanent magnet 2 can be enhanced.
- a gap 15d (first gap and second gap) extending from the circumferential center of the slit 15 (first slit and second slit) toward the magnet insertion hole 11 is formed. Therefore, even when the central portion in the circumferential direction of the slit 15 is heated to the highest temperature in the inner periphery 13 of the rotor core 10, heat is hardly transmitted to the magnet insertion hole 11, and the permanent magnet 2 is heated. The suppression effect can be enhanced.
- the distance between the magnet insertion hole 11 and the gap portion 15d is equal to or greater than the thickness of the electromagnetic steel plate constituting the rotor core 10, heat is further less likely to be transmitted to the magnet insertion hole 11.
- the air holes 14 are arranged on the outer side in the radial direction than the slits 15, so that the air holes 14 are formed on the inner side in the radial direction with respect to the slits 15 or in the inter-slit portion 16. Both the radial distance D1 from the inner periphery 13 of the rotor core 10 to the slit 15 and the circumferential width S1 of the inter-slit portion 16 can be reduced.
- the distance (minimum distance) G1 from the air hole 14 to the slit 15 is equal to or greater than the thickness of the electromagnetic steel sheet constituting the rotor core 10, and is smaller than twice the thickness, the heat path is further narrowed. Can do.
- the number of magnet insertion holes 11 (that is, the number of inter-electrode portions P2) is the same as the number of air holes 14, one air hole 14 faces one magnet insertion hole 11. Therefore, even if the rivets 31 are inserted into all the air holes 14, it is difficult for heat to be transmitted to the magnet insertion holes 11 as compared with the configuration in which the plurality of air holes 14 face one magnet insertion hole 11.
- the number of slits 15 is the same as the number of magnet insertion holes 11, the number of slit inter-part portions 16 that serve as a heat path compared to a configuration in which the number of slits 15 is larger than the number of magnet insertion holes 11. Can be reduced. Thereby, it becomes difficult for heat to be transmitted to the magnet insertion hole 11, and the weight balance of the rotor 1 can be improved.
- the distance L1 from the axis C1 to the inner periphery 13 of the rotor core 10 is not more than the distance (minimum distance) L2 from the inner periphery 13 to the magnet insertion hole 11, the length of the inner periphery 13
- the distance L2 from the inner periphery 13 to the magnet insertion hole 11 is short, and heat is easily transmitted to the magnet insertion hole 11. Therefore, by applying the configuration of the rotor 1 of the first embodiment, it is possible to obtain a more remarkable effect of suppressing demagnetization of the permanent magnet 2 due to heat.
- the opposing part 15c (a 1st opposing part and a 2nd opposing part) which prescribes
- the part where the width S1 of the circumferential direction of the part 16 between slits becomes the minimum increases, and the path
- FIG. 11 is a cross-sectional view showing the rotor 1A of the second embodiment.
- the number of slits 15 is the same as the number of magnet insertion holes 11 (that is, the number of poles).
- the number of slits 15 is smaller than the number of magnet insertion holes 11.
- the number of slits 15 is the number obtained by dividing the number of magnet insertion holes 11 by the natural number N.
- the number of magnet insertion holes 11 that is, the number of poles
- one slit 15 is formed so as to correspond to two magnet insertion holes 11 adjacent in the circumferential direction.
- the number of inter-slit portions 16 formed between adjacent slits 15 is three. In other words, among the six inter-electrode portions P2, the slit-to-slit portions 16 are formed at positions corresponding to the three inter-electrode portions P2, and the slits 15 are formed at the positions corresponding to the remaining three inter-electrode portions P2. Is formed.
- the number of heat paths from the inner periphery 13 to the outer periphery 19 of the rotor core 10 is reduced. As a result, heat is not easily transmitted to the magnet insertion hole 11, and heating of the permanent magnet 2 can be effectively suppressed. Further, since the number of the slits 15 is the number obtained by dividing the number of the magnet insertion holes 11 by the natural number N, the weight balance of the rotor 1 is good and the vibration of the electric motor 100 can be suppressed.
- the air holes 14 are disposed on the radially outer side of the slit-to-slit portion 16 (that is, on the radially inner side of the inter-pole portion P2). Since the portion sandwiched between the slit 15 and the air hole 14 becomes a heat path, the heat path can be narrowed. Further, it is also arranged on the radially inner side of the inter-electrode portion P2 and on the radially outer side of the slit 15.
- the slit 15 with a gap portion 15 d extending toward the magnet insertion hole 11.
- two gaps 15 d are formed from one slit 15 toward the center in the circumferential direction of each of the two magnet insertion holes 11.
- the distance between the magnet insertion hole 11 and the gap 15d is equal to or greater than the thickness of the electromagnetic steel plate constituting the rotor core 10, and is smaller than twice the plate thickness.
- the electric motor of the second embodiment is configured in the same manner as the electric motor of the first embodiment except for the number and shape of the slits 15 of the rotor 1A.
- the number of the magnet insertion holes 11 and the number of the slits 15 are not limited to these.
- the number of the slits 15 should just be the number which remove
- the number of slits 15 is smaller than the number of magnet insertion holes 11 (first number), and the number of magnet insertion holes 11 is a natural number. Since the number is divided by N, the path of heat transmitted from the inner periphery 13 to the outer periphery 19 of the rotor core 10 is reduced. Therefore, it becomes difficult for heat to be transmitted to the magnet insertion hole 11, and the effect of suppressing the heating of the permanent magnet 2 can be enhanced.
- FIG. 12 is a cross-sectional view showing the rotor 1B of the third embodiment.
- the number of rivets 31 to be inserted into the air holes 14 of the rotor 1B is less than or equal to half the number of magnet insertion holes 11 (ie, the number of poles).
- the rotor core 10 of the rotor 1 ⁇ / b> B has six magnet insertion holes 11 along the outer periphery 19 and six slits 15 along the inner periphery 13.
- An air hole 14 is formed on the radially outer side of the inter-slit portion 16 between adjacent slits 15 (position corresponding to the inter-electrode portion P2).
- the number of the air holes 14 is the same as the number (first number) of the magnet insertion holes 11 and is six here.
- rivets 31 are inserted into three air holes 14, which are half the number of the magnet insertion holes 11.
- the air holes 14 in which the rivets 31 are inserted and the air holes 14 in which the rivets 31 are not inserted are alternately arranged in the circumferential direction. That is, the rivet 31 is not inserted into one of the two air holes 14 located on both sides in the circumferential direction of the magnet insertion holes 11 (inter-electrode portion P2).
- the rivet 31 Since the rivet 31 is made of metal, it becomes a heat path. Therefore, when the rivets 31 are inserted into all the air holes 14, the heat path from the inner periphery 13 toward the outer periphery 19 increases, and the heat may be easily transmitted to the magnet insertion hole 11.
- the number of rivets 31 is set to be half or less of the number of magnet insertion holes 11. Furthermore, by not inserting a rivet 31 into at least one of the two air holes 14 located on both sides in the circumferential direction (interpolar part P2) of each magnet insertion hole 11, both sides in the circumferential direction are inserted into the magnet insertion hole 11. The heat is suppressed from being transmitted.
- the electric motor of the third embodiment is configured in the same manner as the electric motor of the first embodiment except for the number of air holes 14 into which the rivets 31 are inserted in the rotor 1B.
- the rivet 31 was inserted in the three air holes 14 among the six air holes 14 of the rotor core 10, here, it is not limited to these.
- the number of the air holes 14 into which the rivets 31 are inserted (third number) may be equal to or less than half the number of the magnet insertion holes 11 (first number).
- the number is less than half of the number (first number) of magnet insertion holes 11. Since the rivet 31 is inserted into the air hole 14, the heat is suppressed from being transmitted to the magnet insertion hole 11 via the rivet 31. Therefore, the effect of suppressing the heating of the permanent magnet 2 can be enhanced.
- a configuration in which the number of slits 15 is smaller than the number (number of poles) of the magnet insertion holes 11 may be applied.
- FIG. 13 is a longitudinal sectional view showing a rotor 1C of the electric motor according to the fourth embodiment.
- the rotor 1 of the first embodiment described above is composed of a laminate of one type of electromagnetic steel sheet 101 (FIG. 5).
- the rotor 1C of the fourth embodiment is configured by a laminate of two types of electromagnetic steel plates 101 and 102.
- the electromagnetic steel plates 101 and 102 are laminated in the axial direction and fixed by caulking or the like.
- the electromagnetic steel plates 102 are disposed at both axial ends of the rotor 1C, and the electromagnetic steel plates 101 are disposed at the center.
- the configuration of the electromagnetic steel plate 101 is the same as that of the electromagnetic steel plate of the rotor 1 of the first embodiment.
- the electromagnetic steel plate 102 has an inner diameter larger than the outer diameter of the shaft 3. In other words, the inner periphery 18 of the electromagnetic steel plate 102 is spaced radially outward with respect to the outer periphery of the shaft 3.
- FIG. 14 is a plan view showing the electromagnetic steel plate 102.
- the inner circumference 18 of the electromagnetic steel sheet 102 is obtained by enlarging the inner circumference 13 (FIG. 3) of the electromagnetic steel sheet 101 of the rotor 1 of Embodiment 1 radially outward.
- the inner periphery 18 of the electromagnetic steel sheet 102 is formed on the radially outer side than the inner periphery 15 a (FIG. 3) that is the most radially inner portion of the slit 15. Therefore, in the electromagnetic steel sheet 102, the outer peripheral edge 15b and the gap 15d of the slit 15 and a part of the facing part 15c exist, but the inner peripheral edge 15a (FIG. 3) does not exist.
- the inner periphery 18 of the electromagnetic steel sheet 102 is spaced radially outward with respect to the outer periphery of the shaft 3, it is not necessary to heat the shaft 3 when shrink-fitting.
- the inner periphery 13 of the electromagnetic steel plate 101 of the rotor core 10 is mainly heated (induction heating).
- the inner periphery 18 of the electromagnetic steel plate 102 is at a position retracted radially outward from the inner periphery 13 of the electromagnetic steel plate 101. Hard to be heated. Therefore, the amount of heat transferred from the inner periphery 18 of the electromagnetic steel plate 102 to the magnet insertion hole 11 is reduced, and the effect of suppressing the heating of the permanent magnet 2 can be enhanced.
- the shaft 3 is shrink-fitted to the inner periphery 13 of the electromagnetic steel plate 101. Sufficient frictional force can be secured. That is, the rotor core 10 can be firmly fixed to the shaft 3.
- the ratio of the electromagnetic steel plate 102 can be increased in such a rotor core 10.
- the electromagnetic steel sheet 102 is disposed at least at one end in the stacking direction of the rotor 1C, the inner diameter of the shaft hole on the inlet side increases when the shaft 3 is inserted into the shaft hole of the rotor 1C. 3 is easy to insert.
- the electromagnetic steel plates 102 are arranged at both ends in the stacking direction of the rotor 1C, the inner diameter of the shaft hole on the inlet side is large when the shaft 3 is inserted into either end of the rotor 1C in the axial direction. Therefore, the shaft 3 can be easily inserted, and the workability is improved.
- the electric motor of the fourth embodiment is configured in the same manner as the electric motor of the first embodiment except that the rotor 1C has the electromagnetic steel plate 102.
- the inner periphery 18 of the electromagnetic steel sheet 102 is formed at a position corresponding to the slit 15 (FIG. 3), but is formed at a position spaced radially outward from the outer periphery of the shaft 3. It only has to be done.
- the rotor core 10 has the electromagnetic steel plate 102 having an inner diameter larger than the outer diameter of the shaft 3, heat is hardly transmitted from the electromagnetic steel plate 102 to the permanent magnet 2. Become. Therefore, the effect of suppressing the heating of the permanent magnet 2 can be enhanced.
- the shaft 3 is shrink-fitted to the inner periphery 13 of the electromagnetic steel plate 101, a sufficient frictional force between the shaft 3 and the rotor core 10 is ensured and the rotor core 10 is firmly fixed to the shaft 3. It is possible.
- the shaft 3 can be easily inserted into the shaft hole of the rotor 1C, and the electromagnetic steel plate 102 is positioned in the stacking direction of the rotor 1C. If it arrange
- a configuration in which the number of slits 15 is smaller than the number (number of poles) of the magnet insertion holes 11 may be applied.
- a configuration in which the rivets 31 are inserted into the air holes 14 having less than half the number of poles may be applied.
- FIG. 15 is a plan view showing an end plate 4A of the rotor according to the fifth embodiment.
- the end plate 4 (FIG. 6) described in the first embodiment has an inner periphery 43 at a position corresponding to the inner periphery 13 (FIG. 3) of the rotor core 10, and the rotor is provided along the inner periphery 43.
- the slit 45 corresponding to the slit 15 of the iron core 10 was provided.
- the inner periphery 43A of the end plate 4A shown in FIG. 15 is formed along the slit 15 (FIG. 3) of the rotor core 10. More specifically, the inner periphery 43 ⁇ / b> A of the end plate 4 ⁇ / b> A is formed radially outward from the inner periphery 15 a (FIG. 3) that is the innermost peripheral portion of the slit 15 of the rotor core 10.
- the inner periphery 43 ⁇ / b> A of the end plate 4 ⁇ / b> A is formed at a position corresponding to the outer periphery 15 b of the slit 15.
- the end plate 4A further includes a plurality of air holes 44 and a plurality of gaps 45d along the inner periphery 43A.
- the air holes 44 of the end plate 4 ⁇ / b> A are formed at positions corresponding to the air holes 14 (FIG. 3) of the rotor core 10.
- the gap 45d of the end plate 4A is formed at a position corresponding to the gap 15d (FIG. 3) of the rotor core 10.
- the end plate 4 ⁇ / b> A is disposed at both axial ends of the rotor core 10, similarly to the end plate 4 of the first embodiment, and has a function of preventing the permanent magnet 2 in the magnet insertion hole 11 from falling off. Therefore, even if the inner periphery 43A of the end plate 4A is spaced radially outward from the outer periphery of the shaft 3, the function of the end plate 4A is not affected.
- the inner periphery 43A of the end plate 4A is spaced radially outward from the outer periphery of the shaft 3, the inner periphery 43A of the end plate 4A is not easily heated when the shaft 3 is shrink-fitted. Therefore, it is suppressed that heat is transmitted to the permanent magnet 2 via the end plate 4A.
- the end plate 4A has the air holes 44 at positions corresponding to the air holes 14 (FIG. 3) of the rotor core 10, the passage of the fluid (air, refrigerant, etc.) in the air holes 14 of the rotor core 10 or the rivets 31 Can be inserted. Further, since the gap 45d is provided at a position corresponding to the gap 15d (FIG. 3) of the rotor core 10, heat is hardly transmitted to the permanent magnet 2 via the end plate 4A.
- the electric motor of the fifth embodiment is configured in the same manner as the electric motor of the first embodiment except for the configuration of the rotor end plate 4A.
- the end plates 4A are arranged at both ends in the axial direction of the rotor core 10. However, the end plates 4A are arranged only at one end in the axial direction of the rotor core 10, and the end plate of the first embodiment is arranged at the other end.
- a plate 4 (FIG. 6) may be arranged.
- FIG. 16 is a plan view showing a rotor end plate 4B according to a modification of the fifth embodiment.
- the inner periphery 43B of the end plate 4B shown in FIG. 16 is formed further radially outward than the inner periphery 43A of the end plate 4A shown in FIG. 15, and is connected to the gap 45d. Since the inner periphery 43B of the end plate 4B is formed radially outward in this way, the inner periphery 43B of the end plate 4B is further less likely to be heated when the shaft 3 is shrink-fitted, and is permanent via the end plate 4B. It is possible to effectively suppress heat from being transmitted to the magnet 2.
- the functions of the end plates 4A and 4B are achieved. It is possible to suppress the heat from being transmitted to the permanent magnet 2 via the end plates 4A and 4B without damaging. Thereby, the effect which suppresses the heating of the permanent magnet 2 can be heightened.
- the end plates 4A and 4B are inserted when the shaft 3 is shrink-fitted. It becomes difficult to be heated and the effect of suppressing the heating of the permanent magnet 2 can be enhanced.
- the inner peripheries 43A and 43B of the end plates 4A and 4B extend in an annular shape in FIGS. 15 and 16, but are not limited to this, and the inner peripheries 43A and 43B have a diameter larger than that of the inner perimeter 13 of the rotor core 10. As long as it is located on the outer side in the direction, it may extend into a polygonal shape, for example.
- a configuration in which the number of slits 15 is smaller than the number (number of poles) of the magnet insertion holes 11 may be applied.
- a configuration in which the rivets 31 are inserted into the air holes 14 having less than half the number of poles may be applied.
- a configuration in which the rotor core 10 includes the electromagnetic steel plate 102 in which the inner periphery 18 is separated from the shaft 3 may be applied.
- FIG. 17 is a longitudinal sectional view showing the configuration of the rotary compressor 300.
- the rotary compressor 300 is used in, for example, an air conditioner, and includes a sealed container 307, a compression element 301 disposed in the sealed container 307, and an electric motor 100 that drives the compression element 301.
- the compression element 301 includes a cylinder 302 having a cylinder chamber 303, a shaft 3 rotated by the electric motor 100, a rolling piston 304 fixed to the shaft 3, and a vane (not shown) that divides the inside of the cylinder chamber 303 into a suction side and a compression side. And an upper frame 305 and a lower frame 306 that close the axial end surface of the cylinder chamber 303 when the shaft 3 is inserted. An upper discharge muffler 308 and a lower discharge muffler 309 are mounted on the upper frame 305 and the lower frame 306, respectively.
- the sealed container 307 is a cylindrical container. Refrigerating machine oil (not shown) that lubricates the sliding portions of the compression element 301 is stored at the bottom of the sealed container 307.
- the shaft 3 is rotatably held by an upper frame 305 and a lower frame 306 as bearing portions.
- the cylinder 302 includes a cylinder chamber 303 therein, and the rolling piston 304 rotates eccentrically in the cylinder chamber 303.
- the shaft 3 has an eccentric shaft portion, and a rolling piston 304 is fitted to the eccentric shaft portion.
- the stator 5 of the electric motor 100 is incorporated inside the frame of the sealed container 307 by a method such as shrink fitting, press fitting, or welding. Electric power is supplied to the coil 55 of the stator 5 from a glass terminal 311 fixed to the hermetic container 307.
- the shaft 3 is fixed to a shaft hole formed at the center of the rotor core 10 (FIG. 2) of the rotor 1.
- An accumulator 310 that stores refrigerant gas is attached to the outside of the sealed container 307.
- a suction pipe 313 is fixed to the sealed container 307, and refrigerant gas is supplied from the accumulator 310 to the cylinder 302 via the suction pipe 313.
- a discharge pipe 312 for discharging the refrigerant to the outside is provided on the top of the sealed container 307.
- the refrigerant gas supplied from the accumulator 310 is supplied into the cylinder chamber 303 of the cylinder 302 through the suction pipe 313.
- the shaft 3 rotates together with the rotor 1.
- the rolling piston 304 fitted to the shaft 3 rotates eccentrically in the cylinder chamber 303, and the refrigerant is compressed in the cylinder chamber 303.
- the refrigerant compressed in the cylinder chamber 303 passes through the discharge mufflers 308 and 309, and further rises in the sealed container 307 through the air holes 14 and the like (FIG. 2) of the rotor core 10.
- the refrigerant rising in the hermetic container 307 is discharged from the discharge pipe 312 and supplied to the high-pressure side of the refrigeration cycle.
- the electric motor 100 suppresses the demagnetization due to the heat of the permanent magnet 2, thereby suppressing the decrease in the magnetic flux of the permanent magnet 2, thereby improving the motor efficiency and increasing the output. Can do. Therefore, by applying this electric motor 100 to the rotary compressor 300, the operation efficiency of the rotary compressor 300 can be improved and the output can be increased.
- the electric motor 100 according to the first to fifth embodiments can be used not only for the rotary compressor 300 but also for other types of compressors.
- FIG. 18 is a diagram illustrating a configuration of the refrigeration cycle apparatus 400.
- the refrigeration cycle apparatus 400 includes a compressor (rotary compressor) 300, a four-way valve 401, a condenser 402, a decompression device (expander) 403, an evaporator 404, a refrigerant pipe 405, and a control unit 406. I have.
- the compressor 300, the condenser 402, the decompression device 403, and the evaporator 404 are connected by a refrigerant pipe 405 to constitute a refrigeration cycle.
- the operation of the refrigeration cycle apparatus 400 is as follows.
- the compressor 300 compresses the sucked refrigerant and sends it out as a high-temperature and high-pressure gas refrigerant.
- the four-way valve 401 switches the flow direction of the refrigerant.
- the refrigerant sent from the compressor 300 flows to the condenser 402.
- the condenser 402 performs heat exchange between the refrigerant sent out from the compressor 300 and air (for example, outdoor air), condenses and liquefies the refrigerant, and sends it out.
- the decompression device 403 expands the liquid refrigerant sent out from the condenser 402 and sends it out as a low-temperature and low-pressure liquid refrigerant.
- the evaporator 404 exchanges heat between the low-temperature and low-pressure liquid refrigerant sent out from the decompression device 403 and air (for example, indoor air), causes the refrigerant to take heat of the air and evaporates (vaporizes) the gas refrigerant. Send out as.
- the air from which heat has been removed by the evaporator 404 is supplied to a target space (for example, a room) by a blower (not shown).
- the operations of the four-way valve 401 and the compressor 300 are controlled by the control unit 406.
- the compressor 300 of the refrigeration cycle apparatus 400 can be applied to the electric motor 100 of the first to fifth embodiments described above, thereby improving the operation efficiency. Therefore, the energy efficiency of the refrigeration cycle apparatus 400 can be improved.
- FIG. 19 is a diagram showing a configuration of an air conditioner 500 to which the electric motor 100 of Embodiments 1 to 5 can be applied.
- the air conditioner 500 includes an outdoor unit 501, an indoor unit 502, and a refrigerant pipe 503 that connects them.
- the outdoor unit 501 includes an outdoor fan 505 as a fan.
- FIG. 20A is a front view showing the configuration of the outdoor unit 501.
- FIG. 20B is a cross-sectional view taken along line 20B-20B shown in FIG.
- the outdoor unit 501 includes a housing 506 and a frame 507 fixed in the housing 506.
- An electric motor 100 as a drive source for the outdoor fan 505 is fixed to the frame 507.
- An impeller 504 is attached to the shaft 3 of the electric motor 100 via a hub 508.
- the outdoor fan 505 is configured by the electric motor 100, the hub 508, and the impeller 504.
- FIG. 20A also shows a compressor 509 that compresses the refrigerant.
- the rotary compressor 300 shown in FIG. 17 may be used.
- the impeller 504 attached to the shaft 3 rotates and blows air outside the room.
- the heat released when the refrigerant compressed by the compressor 509 is condensed by a condenser (not shown) is released to the outside by the ventilation of the outdoor fan 505.
- the electric motor 100 of each embodiment described above can suppress a decrease in magnetic flux of the permanent magnet 2 by suppressing demagnetization of the permanent magnet 2, thereby improving motor efficiency and increasing output. Therefore, by using this electric motor 100 as a power source for the outdoor blower 505, the operating efficiency of the air conditioner 500 can be improved and the output can be increased.
- each embodiment was used for the outdoor air blower 505 of the outdoor unit 501, here, the electric motor of each embodiment may be used for the air blower of the indoor unit 502.
- the magnetized permanent magnet 2 is disposed in the magnet insertion hole 11 .
- An effect can be obtained.
- the temperature at which the magnetized permanent magnet 2 is demagnetized is lower than the temperature at which the performance and quality of the non-magnetized permanent magnet 2 are degraded, the magnetized permanent magnet 2 is inserted into the magnet insertion hole. 11, the effects of the respective embodiments can be exhibited more remarkably.
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Abstract
Description
<電動機100の構成>
まず、本発明の実施の形態1について説明する。図1は、実施の形態1の電動機100を示す横断面図である。電動機100は、ブラシレスDCモータであり、インバータを有する制御装置の周波数制御によって回転を制御されるものである。
固定子5は、回転子1の径方向外側に、回転子1を囲むように設けられている。固定子5は、固定子鉄心50と、固定子鉄心50に巻き付けられたコイル55とを有する。固定子鉄心50は、複数の電磁鋼板を軸方向に積層し、カシメ等により固定したものである。電磁鋼板の厚さは0.1~1.0mmの範囲内であり、一例としては0.35mmである。
図2は、回転子1を示す横断面図である。回転子1は、軸線C1を中心とする円筒状の回転子鉄心10を有する。回転子鉄心10は、複数の電磁鋼板を軸方向に積層し、カシメ等により固定したものである。電磁鋼板の厚さは0.1~1.0mmの範囲内であり、一例としては0.35mmである。
次に、この実施の形態1の作用について説明する。回転子1の製造時には、プレス機で電磁鋼板を打ち抜いた後、打ち抜いた複数の電磁鋼板を軸方向に積層し、カシメ等により一体化して、回転子鉄心10を得る。
(1)回転子鉄心10の内周13から磁石挿入孔11までの領域内で、空隙をできるだけ大きくする。
(2)回転子鉄心10の内周13から磁石挿入孔11までの熱の経路を、径方向に、できるだけ長くする。
(3)回転子鉄心10の内周13から磁石挿入孔11までの熱の経路を、周方向に、できるだけ狭くする。
W1/D1>0.95、
W2/D1>0.95、
S1<0.55mm、および
G1<1.1mm
という条件を満たす場合には、永久磁石2の温度が100℃以下に抑えられることが分かる。
以上説明したように、この発明の実施の形態1では、回転子鉄心10は、外周19に沿って、周方向に隣り合う磁石挿入孔11(第1の磁石挿入孔と第2の磁石挿入孔)を有し、内周13に沿って、周方向に隣り合う複数のスリット15(第1のスリットおよび第2のスリット)を有する。各スリット15は、隣接するスリット15に対向する対向部15c(第1の対向部および第2の対向部)を有する。各対向部15cは、内側端部21(第1の内側端部および第2の内側端部)および外側端部22(第1の外側端部および第2の外側端部)を有する。回転子鉄心10は、互いに対向する対向部15c(第1の対向部と第2の対向部)の間に、内側端部21同士(第1の内側端部および第2の内側端部)を結ぶ直線23と、外側端部22同士(第1の外側端部および第2の外側端部)を結ぶ直線24とで規定されたスリット間部16を有する。スリット間部16は、隣り合う磁石挿入孔11の間の極間部P2に対して径方向の内側に配置されている。回転子鉄心10の内周13から各スリット15までの径方向の最小距離をD1とし、各スリット15の径方向の最小幅をW1とし、スリット間部16の径方向の長さをW2とすると、D1<W1およびD1<W2の少なくとも一方が成立する。
次に、本発明の実施の形態2について説明する。図11は、実施の形態2の回転子1Aを示す横断面図である。上述した実施の形態1の回転子1では、スリット15の数が磁石挿入孔11の数(すなわち極数)と同じであった。これに対し、この実施の形態2の回転子1Aでは、スリット15の数が磁石挿入孔11の数よりも少ない。
次に、本発明の実施の形態3について説明する。図12は、実施の形態3の回転子1Bを示す横断面図である。この実施の形態3では、回転子1Bの風穴14に挿入するリベット31の数を、磁石挿入孔11の数(すなわち極数)の半分以下としている。
次に、本発明の実施の形態4について説明する。図13は、実施の形態4の電動機の回転子1Cを示す縦断面図である。上述した実施の形態1の回転子1は、1種類の電磁鋼板101(図5)の積層体で構成されていた。これに対し、実施の形態4の回転子1Cは、2種類の電磁鋼板101,102の積層体で構成されている。
次に、本発明の実施の形態5について説明する。図15は、実施の形態5の回転子の端板4Aを示す平面図である。実施の形態1で説明した端板4(図6)は、回転子鉄心10の内周13(図3)に対応する位置に内周43を有し、その内周43に沿って、回転子鉄心10のスリット15に対応するスリット45を有していた。
次に、上述した実施の形態1~5の電動機100が適用可能なロータリ圧縮機300について説明する。図17は、ロータリ圧縮機300の構成を示す縦断面図である。ロータリ圧縮機300は、例えば空気調和装置に用いられるものであり、密閉容器307と、密閉容器307内に配設された圧縮要素301と、圧縮要素301を駆動する電動機100とを備えている。
次に、上述したロータリ圧縮機300を備えた冷凍サイクル装置400(空気調和装置)について説明する。図18は、冷凍サイクル装置400の構成を示す図である。冷凍サイクル装置400は、圧縮機(ロータリ圧縮機)300と、四方弁401と、凝縮器402と、減圧装置(膨張器)403と、蒸発器404と、冷媒配管405と、制御部406とを備えている。圧縮機300、凝縮器402、減圧装置403および蒸発器404は、冷媒配管405によって連結され、冷凍サイクルを構成している。
次に、上述した各実施の形態の電動機を適用した空気調和装置について説明する。図19は、実施の形態1~5の電動機100が適用可能な空気調和装置500の構成を示す図である。空気調和装置500は、室外機501と、室内機502と、これらを接続する冷媒配管503とを備える。室外機501は、送風機としての室外送風機505を備えている。
Claims (23)
- 軸線を中心とする環状の内周と、前記軸線を中心とする径方向において前記内周の外側に位置する外周とを有し、電磁鋼板で構成された回転子鉄心を備え、
前記回転子鉄心は、前記外周に沿って、前記軸線を中心とする周方向に隣り合う第1の磁石挿入孔と第2の磁石挿入孔とを有し、前記内周に沿って、前記周方向に隣り合う第1のスリットと第2のスリットとを有し、
前記第1の磁石挿入孔には第1の永久磁石が配置され、前記第2の磁石挿入孔には第2の永久磁石が配置され、
前記第1のスリットは、前記第2のスリットに対向する第1の対向部を有し、
前記第2のスリットは、前記第1のスリットに対向する第2の対向部を有し、
前記第1の対向部は、前記径方向における内側の端部に第1の内側端部を有し、前記径方向における外側の端部に第1の外側端部を有し、
前記第2の対向部は、前記径方向における内側の端部に第2の内側端部を有し、前記径方向における外側の端部に第2の外側端部を有し、
前記回転子鉄心は、前記第1の対向部と前記第2の対向部との間に、前記第1の内側端部と前記第2の内側端部とを結ぶ第1の直線と、前記第1の外側端部と前記第2の外側端部とを結ぶ第2の直線とで規定されるスリット間部を有し、
前記スリット間部は、前記第1の磁石挿入孔と前記第2の磁石挿入孔との間の極間部に対して前記径方向の内側に配置され、
前記回転子鉄心の前記内周から前記第1のスリットおよび前記第2のスリットまでの前記径方向の最小距離をD1とし、
前記第1のスリットおよび前記第2のスリットの前記径方向の最小幅をW1とし、
前記スリット間部の前記径方向の長さをW2とすると、
D1<W1およびD1<W2の少なくとも一方が成立する
回転子。 - D1<W1およびD1<W2の両方が成立する
請求項1に記載の回転子。 - 前記スリット間部の前記周方向の最小幅が、前記電磁鋼板の板厚以上で、且つ、前記板厚の2倍よりも小さい
請求項1または2に記載の回転子。 - 前記回転子鉄心は、前記第1のスリットから前記第1の磁石挿入孔に向けて延在する第1の空隙部、および、前記第2のスリットから前記第2の磁石挿入孔に向けて延在する第2の空隙部を有する
請求項1から3までの何れか1項に記載の回転子。 - 前記第1の空隙部から前記第1の磁石挿入孔までの距離、および、前記第2の空隙部から前記第2の磁石挿入孔までの距離が、いずれも、前記電磁鋼板の板厚以上で、且つ、前記板厚の2倍よりも小さい
請求項4に記載の回転子。 - 前記回転子鉄心は、前記第1の磁石挿入孔および前記第2の磁石挿入孔を含む第1の数の磁石挿入孔を有し、
前記回転子鉄心は、前記スリット間部を含む第2の数のスリット間部を有し、
前記第2の数は、前記第1の数を自然数で除した値である
請求項1から5までの何れか1項に記載の回転子。 - 前記回転子鉄心は、前記第1のスリットおよび前記第2のスリットよりも前記径方向の外側に配置された風穴をさらに有する
請求項1から6までの何れか1項に記載の回転子。 - 前記風穴は、前記極間部に対して前記径方向の内側に配置されている
請求項7に記載の回転子。 - 前記風穴から前記第1のスリットおよび前記第2のスリットまでの最小距離は、前記電磁鋼板の板厚以上で、且つ、前記板厚の2倍よりも小さい
請求項7または8に記載の回転子。 - 前記回転子鉄心は、前記第1の磁石挿入孔および前記第2の磁石挿入孔を含む第1の数の磁石挿入孔を有し、
前記回転子鉄心は、前記第1のスリットおよび前記第2のスリットよりも前記径方向の外側に、前記風穴を含む前記第1の数の風穴を有する
請求項7から9までの何れか1項に記載の回転子。 - 前記第1の数の風穴のうち、前記第1の数の半分以下の第3の数の風穴に、リベットが挿入されている
請求項10に記載の回転子。 - 前記リベットが挿入された前記風穴と、前記リベットが挿入されていない前記風穴とが、前記周方向に交互に配列されている
請求項11に記載の回転子。 - 前記軸線から前記回転子鉄心の前記内周までの距離が、前記回転子鉄心の前記内周から前記第1の磁石挿入孔および前記第2の磁石挿入孔までの最小距離以下である
請求項1から12までの何れか1項に記載の回転子。 - 前記第1の対向部は、前記径方向の両端に湾曲部を有し、前記第2の対向部は、前記径方向の両端に湾曲部を有し、
前記第1の対向部の前記湾曲部および前記第2の対向部の前記湾曲部は、いずれも、前記電磁鋼板の板厚以下の曲率半径を有する
請求項1から13までの何れか1項に記載の回転子。 - 前記第1の対向部は、前記湾曲部の間に直線状に延在する部分を有し、前記第2の対向部は、前記湾曲部の間に直線状に延在する部分を有する
請求項14に記載の回転子。 - 前記回転子鉄心の前記内周に固定されたシャフトをさらに備え、
前記回転子鉄心は、前記電磁鋼板を含む第4の数の電磁鋼板が、前記軸線の方向に積層されて構成され、
前記第4の数の電磁鋼板は、前記軸線の方向の端部に配置された少なくとも1つの電磁鋼板を有し、
前記少なくとも1つの電磁鋼板は、前記シャフトの外周から前記径方向の外側に離間した内周を有する
請求項1から15までの何れか1項に記載の回転子。 - 前記少なくとも1つの電磁鋼板の前記内周が、前記第1のスリットおよび前記第2のスリットの前記径方向の最も内側の部分よりも前記径方向の外側に位置する
請求項16に記載の回転子。 - 前記軸線の方向において前記回転子鉄心の少なくとも一端に、端板を有し、
前記端板は、前記回転子鉄心の前記第1のスリットおよび前記第2のスリットの前記径方向の最も内側の部分よりも前記径方向の外側に位置する内周を有する
請求項1から17までの何れか1項に記載の回転子。 - 前記端板は、当該端板の前記内周から前記径方向の外側に向けて延在する空隙を有する、
請求項18に記載の回転子。 - 請求項1から19までの何れか1項に記載の回転子と、
前記回転子の前記径方向の外側に設けられ、前記回転子を囲む固定子と
を備える
電動機。 - 電動機と、前記電動機によって駆動される圧縮要素とを備えた圧縮機であって、
前記電動機は、
請求項1から19までの何れか1項に記載の回転子と、
前記回転子の前記径方向の外側に設けられ、前記回転子を囲む固定子と
を備える
圧縮機。 - 羽根車と、羽根車を回転させる電動機とを備えた送風機であって、
前記電動機は、
請求項1から19までの何れか1項に記載の回転子と、
前記回転子の前記径方向の外側に設けられ、前記回転子を囲む固定子と
を備える
送風機。 - 室外機と、室内機と、前記室外機と前記室内機とを連結する冷媒配管とを備え、
前記室外機および前記室内機の少なくとも一方は、送風機を有し、
前記送風機は、羽根と、前記羽根を回転させる電動機とを有し、
前記電動機は、
請求項1から19までの何れか1項に記載の回転子と、
前記回転子の前記径方向の外側に設けられ、前記回転子を囲む固定子と
を備える
空気調和装置。
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Also Published As
Publication number | Publication date |
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JPWO2018179063A1 (ja) | 2019-11-07 |
AU2017407862B2 (en) | 2020-09-10 |
AU2017407862A1 (en) | 2019-09-05 |
KR20190112764A (ko) | 2019-10-07 |
EP3605796B1 (en) | 2021-08-18 |
KR102224190B1 (ko) | 2021-03-08 |
CN110431726A (zh) | 2019-11-08 |
EP3605796A1 (en) | 2020-02-05 |
CN110431726B (zh) | 2021-10-12 |
EP3605796A4 (en) | 2020-03-18 |
US11264848B2 (en) | 2022-03-01 |
US20200014259A1 (en) | 2020-01-09 |
JP6689449B2 (ja) | 2020-04-28 |
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