CN203504381U - Bus bar unit - Google Patents

Bus bar unit Download PDF

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Publication number
CN203504381U
CN203504381U CN201320582235.7U CN201320582235U CN203504381U CN 203504381 U CN203504381 U CN 203504381U CN 201320582235 U CN201320582235 U CN 201320582235U CN 203504381 U CN203504381 U CN 203504381U
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CN
China
Prior art keywords
electronic component
bus bar
main body
bar holder
leg
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
CN201320582235.7U
Other languages
Chinese (zh)
Inventor
服部隆宏
水谷健志
清水保志
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Corp
Original Assignee
Nidec Corp
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
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Publication of CN203504381U publication Critical patent/CN203504381U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model provides a bus bar unit which comprises an electronic component, a bus bar and a bus bar holder. The electronic component has an electronic component body part and a foot part which is extended from the electronic component body part. The bus bar is electrically connected with the electronic component. The bus bar holder supports the bus bar and is made of an insulating material. The bus bar holder is composed of a bus bar holder body part and a connector part which is disposed axially towards an outer side from the bus bar holder body part. The bus bar holder body part has electronic component connecting parts which fix the bus bar and the foot part through welding, and is characterized in that the bus bar holder body part has an electronic component retaining part which is disposed between the electronic component body part and the electronic component connecting parts and retains the foot part through fusion welding.

Description

Bus bar unit
Technical Field
The utility model relates to an electronic component's retaining structure.
Background
Conventionally, in a motor including a rotor and a stator, a hall element for detecting a rotational position of the rotor, a capacitor for adjusting a rotational speed of the rotor, and an electronic element such as a resistor are mounted on the stator.
Patent document 1 discloses a structure in which: an electronic component including a main body and a leg is provided in a recess of the housing, and the leg is extended from the main body at an angle of 90 degrees or more and is welded to the conductive member.
Patent document 1: japanese laid-open patent publication No. 2003-151691
However, merely soldering the legs of the electronic component has a problem that the electronic component is detached from the motor due to vibration (vibration of the engine and the transmission) during the operation of the automobile. Therefore, a method of preventing the electronic component from falling off by injecting an adhesive into the recess for accommodating the electronic component is also considered.
However, when the electronic components are fixed by the adhesive, the adhesive is thermally contracted by heat generated from an engine, a transmission, a motor, and the like during the operation of the automobile. There is a problem that the foot portion is broken or deformed by applying tension to the foot portion due to thermal contraction of the adhesive.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a motor capable of reducing the occurrence of the detachment of an electronic component, the breakage of a leg portion, and the deformation.
In order to solve the above problem, a busbar unit according to a first exemplary embodiment of the present invention includes: an electronic component having an electronic component main body portion and a leg portion extending from the electronic component main body portion; a bus bar electrically connected to the electronic component; and a bus bar holder which supports the bus bar and is formed of an insulating material, wherein the bus bar holder is configured from a bus bar holder body portion and a connector portion provided radially outward from the bus bar holder body portion, the bus bar holder body portion has an electronic component connecting portion which fixes the bus bar and the leg portion by welding, and the bus bar holder body portion has an electronic component holding portion which holds the leg portion by welding between the electronic component body portion and the electronic component connecting portion.
A second invention exemplified by the present application is characterized in that the electronic component holding portion is located closer to the electronic component body portion than to the electronic component connecting portion.
A third invention exemplified by the present application is characterized in that the electronic component holding portion is located closer to the electronic component connecting portion than to the electronic component body portion.
A fourth invention according to an exemplary embodiment of the present invention is characterized in that the bus bar holder body has a housing portion for housing the electronic component body, a groove portion for housing the leg portion, and a side wall portion for surrounding the leg portion from a direction perpendicular to a direction in which the leg portion extends, and the top of the electronic component holding portion is located at a position closer to the bottom surface side of the housing portion than the top of the side wall portion.
A fifth novel aspect of the present invention is characterized in that the electronic component holding part is formed over the entire area or a part of the area in the direction in which the leg extends.
In a sixth aspect of the present invention, the leg portion has a bent portion bent in a direction different from a direction extending from the electronic component body portion.
Drawings
Fig. 1 is a sectional view of a brushless motor according to an embodiment of the present invention.
Fig. 2 is a plan view of the bus bar unit.
Fig. 3 is a bottom view of the bus bar unit.
Fig. 4 is a perspective view of an electronic component.
Fig. 5 is a partially enlarged perspective view of the bus bar unit before accommodating the electronic component.
Fig. 6 is a partially enlarged perspective view of the bus bar holder body portion after the electronic component is accommodated.
Fig. 7 is a partially enlarged sectional view taken along a chain line X of fig. 6 after accommodating the electronic component.
Fig. 8 is a partially enlarged sectional view taken along a chain line Y of fig. 6 after accommodating electronic components.
Fig. 9 is a partially enlarged perspective view of the bus bar holder body portion after holding the electronic component by welding.
Fig. 10 is a partially enlarged sectional view along the chain line X of fig. 9 after the electronic component is held by the fusion bonding.
Fig. 11 is a partially enlarged sectional view along the chain line Y of fig. 9 after the electronic component is held by the soldering.
Fig. 12 is a partially enlarged cross-sectional view of the bus bar holder body part before the tool is brought into contact with the bus bar holder body part.
Fig. 13 is a partially enlarged sectional view of the bus bar holder body part when the tool is brought into contact with the bus bar holder body part.
Fig. 14 is a partially enlarged cross-sectional view of the bus bar holder body part after the electronic component is welded to the bus bar holder body part by the tool.
Description of the symbols
Bus bar holder body part 22
Accommodating part 221
Groove 222
Side 2221
Bottom surface 2222
Side wall part 223
The top 2231 of the side gusset portions 223
Electronic component holding part 224
Top 2241 of electronic component holder 224
Coil connecting bus bars 31, 32, 33
Sensor connection bars 41, 42, 43, 44, 45, 46, 51, 52, 53
Electronic component connecting parts 413, 423, 433, 443, 444, 445, 453, 454, 455, 463, 464, 513, 523, 533
Hall IC61, 62, 63
Resistors 711, 712, 721, 722, 731, 732
Capacitors 713, 723, 733
Electronic component body 74
Foot 75
Bend 76
Tool 80
Tip 801
Support portion 802
Detailed Description
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a side cross-sectional view of a brushless motor 1 according to the present embodiment. The brushless motor 1 shown in fig. 1 includes a housing 11, a stator core 12, a coil 13, a shaft 14, a rotor 15, a sensor magnet 16, and a bus bar unit 20. The brushless motor 1 is used for driving a gear selector or a clutch of a transmission mounted on a vehicle, for example. The brushless motor 1 is driven by a current supplied from a power supply device (not shown) such as a battery via a control device (not shown) such as an Electronic Control Unit (ECU).
The brushless motor 1 can be mounted in various directions depending on the equipment to be mounted. That is, there is no absolute up-down direction in the brushless motor 1. Therefore, in the present specification, the upper side of the brushless motor 1 in the direction of the central axis J1 in fig. 1 is simply referred to as "upper side" and the lower side is simply referred to as "lower side". The direction parallel to the center axis J1 is simply referred to as the "axial direction", the direction perpendicular to the center axis J1 is simply referred to as the "radial direction", and the direction along an arc centered on the center axis J1 is simply referred to as the "circumferential direction".
The housing 11 has a cylindrical shape centered on the central axis J1 of the brushless motor 1, and the stator core 12 is fixed to the inner circumferential surface of the housing 11. The stator core 12 includes a core back 12a configured in a ring shape about a central axis J1, and a plurality of teeth 12b radially arranged from the core back 12a toward the central axis J1. The coil 13 is formed by winding a conductive wire around each tooth portion 12 b.
A ball bearing 17A and a ball bearing 17B are held on the upper portion of the housing 11 and the lower portion of the bus bar unit 20, respectively. The shaft 14 having the center axis of the central axis J1 is rotatably held by the ball bearing 17A held by the housing 11 and the ball bearing 17B held by the bus bar unit 20.
The rotor 15 includes a rotor magnet 151 and a rotor core 152, and rotates integrally with the shaft 14. The rotor magnet 151 is fixed to the outer peripheral surface of a rotor core 152 fixed to the shaft 14. The sensor magnet 16 is disposed below the rotor 15 and is held by a sensor yoke 18 fixed to the shaft 14.
The bus bar unit 20 is disposed to cover the lower side of the stator core 12. The bus bar unit 20 is a wiring device for supplying current to the coil 13. Also, the bus bar unit 20 holds the hall IC61, the hall IC62, and the hall IC63 (refer to fig. 2). The inner peripheral sides of the hall IC61, the hall IC62, and the hall IC63 face the radial outer side of the sensor magnet 16.
In the brushless motor 1 having the above-described configuration, a current corresponding to the rotational position of the rotor magnet 151 is supplied from the power supply device to the coil 13 via the control device. As the coil 13 is energized, a magnetic field is generated, and the rotor magnet 151 rotates. In this way, the brushless motor 1 obtains a rotational driving force.
The bus bar unit 20 will be explained next. Fig. 2 is a plan view of the bus bar unit 20. Fig. 3 is a bottom view of the bus bar unit 20. Fig. 4 is a perspective view of a plurality of electronic components mounted on the bus bar unit 20. Fig. 5 is a partially enlarged perspective view of the bus bar unit 20 before accommodating a plurality of electronic components.
As shown in fig. 2 and 3, the bus bar unit 20 includes a bus bar holder 21, a plurality of bus bars, a plurality of electronic components, and hall ICs 61, 62, 63.
The bus bar holder 21 is formed of an insulating material such as a thermoplastic resin, and includes a bus bar holder body 22 having a substantially circular shape in a plan view and a connector portion 212 provided radially outward from the bus bar holder body 22. The bus bar holder main body 22 supports a plurality of bus bars, a plurality of electronic components, hall ICs 61, hall ICs 62, and hall ICs 63.
The plurality of bus bars are constituted by coil connecting bus bars 31, 32, 33 and sensor connecting bus bars 41, 42, 43, 44, 45, 46, 51, 52, 53.
The coil connecting bus bars 31, 32, 33 are conductive members for supplying a three-phase current to the coil 13. The sensor connection bus bars 41, 42, 43, 46, 51, 52, and 53 are conductive members for outputting hall signals output from the hall ICs 61, 62, and 63 to the control device. The sensor connection bus bar 44 is a conductive member for supplying power to the hall ICs 61, 62, 63. The sensor connection bus bar 45 is a conductive member for grounding of the hall ICs 61, 62, 63.
The sensor connection bus bars 41, 42, 43, 44, 45, 46, 51, 52, 53 have electronic component connection portions 413, 423, 433, 443, 444, 445, 453, 454, 455, 463, 464, 513, 523, 533 fixed to a plurality of electronic components by soldering. The sensor connection bus bar 41 includes an electronic component connection portion 413 connected to the resistor 712 and the capacitor 713. The sensor connection bus bar 42 has an electronic component connection portion 423 connected to the resistor 722 and the capacitor 723. The sensor connection bus bar 43 has an electronic component connection portion 433 connected to the electronic component connection portion 463 of the sensor connection bus bar 46.
The sensor connection bus bar 44 has electronic component connection portions 443, 444, and 445 connected to the resistors 711, 721, and 731. The sensor connection bus bar 45 has electronic component connection portions 453, 454, 455 connected to the capacitors 713, 723, 733. The sensor connection bus bar 46 has an electronic component connection portion 463 connected to the sensor connection bus bar 43 and an electronic component connection portion 464 connected to the resistor 732 and the capacitor 733.
The plurality of electronic elements are constituted by resistors 711, 712, 721, 722, 731, 732 and capacitors 713, 723, 733. The plurality of electronic components are disposed on the bottom surface side of the bus bar holder main body portion 22. This can suppress the change in the characteristics of the resistors 711, 712, 721, 722, 731, 732 and the capacitors 713, 723, 733 due to the heat generated from the coil 13.
The sensor connection bus bars 41, 42, 43, 44, 45, 46, 51, 52, 53, the resistors 711, 712, 721, 722, 731, 732, and the capacitors 713, 723, 733 constitute a hall IC circuit. The hall IC circuit supplies power to the hall ICs 61, 62, and 63, and outputs a hall signal output from the hall ICs to the control device.
The hall ICs 61, 62, and 63 are disposed on the upper surface side of the bus bar holder body portion 22, and output hall signals according to the position of the sensor magnet 16.
In this way, by forming the hall IC circuit in the bus bar holder 21, a space for arranging the circuit board is not required, and therefore, the bus bar unit 20 can be downsized.
As shown in fig. 4, the plurality of electronic components are constituted by an electronic component main body portion 74 and leg portions 75 extending from the electronic component main body portion 74. The electronic component main body 74 has a substantially cylindrical shape having two faces 741 and a peripheral surface 742, and the leg portions 75 extend from the respective centers of the two faces 741. Hereinafter, the resistor 721 will be described as a representative of a plurality of electronic elements for convenience.
As shown in fig. 5, the bus bar holder main body 22 includes an accommodating portion 221 for accommodating the electronic component main body 74, a groove portion 222 for accommodating the leg portion 75, and a side wall portion 223 surrounding the leg portion 75 from a direction perpendicular to a direction in which the leg portion 75 extends. The groove 222 has a side surface 2221 and a bottom surface 2222. By providing the housing portion 221 and the groove portion 222, the bus bar unit 20 can be downsized in the axial direction while ensuring a housing space for the resistor 721. Hereinafter, the electronic component connecting portion 444 will be described as a representative of a plurality of electronic component connecting portions for convenience.
The bus bar holder main body portion 22 has an electronic component holding portion 224 (refer to fig. 9 to 11) that holds the leg portion 75 by welding. The electronic component holding portion 224 is held between the electronic component main body portion 74 and the electronic component connecting portion 444 by welding. The electronic component (the resistor 721) is held by the electronic component holding portion 224 by welding and fixed to the electronic component connecting portion 444 by welding without using an adhesive. Therefore, the material cost of the adhesive can be reduced. However, an adhesive may be used in order to further improve the fixing strength. Hereinafter, the electronic component holding portion 224 between the resistor 721 and the electronic component connecting portion 444 will be described as a representative of the plurality of electronic component holding portions for convenience.
Next, a detailed part of the bus bar unit 20 will be described. Fig. 6 to 8 are partially enlarged views of the bus bar holder body portion 22 before welding. Fig. 9 to 11 are partially enlarged views of the bus bar holder body portion 22 after welding. Fig. 12 to 14 are partially enlarged sectional views showing a step of forming the electronic component holding portion 224.
Fig. 6 is a partially enlarged perspective view of the bus bar holder body portion 22 after the electronic component (the resistor 721) is accommodated. Fig. 7 is a partially enlarged cross-sectional view along the chain line X of fig. 6 after accommodating an electronic component (resistor 721). Fig. 8 is a partially enlarged sectional view along the chain line Y of fig. 6 after accommodating an electronic component (resistor 721).
As shown in fig. 7, the depth d1 of the receiving portion 221 is deeper than the depth d2 of the groove portion 222. That is, the relational expression of d1> d2 holds. In fig. 7, the one-dot chain line indicates the shape of the groove portion 222, and the auxiliary line indicates an extended line of each member constituting the bus bar unit 20. As shown in fig. 8, the width w1 of the groove 222 is larger than the diameter d3 of the leg 75. That is, a gap w2 is formed between the side surface 2221 of the groove 222 and the leg portion 75, and the relational expression w1> d3 holds. In addition, the auxiliary lines in fig. 8 indicate extended lines of the leg portions 75 and the side surfaces 2221 of the groove portions 222.
Fig. 9 is a partially enlarged perspective view of the bus bar holder body portion 22 after the electronic component (the resistor 721) is held by welding. Fig. 10 is a partially enlarged cross-sectional view along the chain line X of fig. 9 after the electronic component (the resistor 721) is held by welding. In fig. 10, the one-dot chain line indicates the shape of the groove portion 222, and the auxiliary line indicates an extended line of each member constituting the bus bar unit 20. Fig. 11 is a partially enlarged cross-sectional view along the chain line Y of fig. 9 after the electronic component (the resistor 721) is held by welding.
As shown in fig. 10, the distance from the electronic component holding portion 224 to the electronic component main body portion 74 is shorter than the distance from the electronic component holding portion 224 to the electronic component connecting portion 444. That is, the relational expression of w3> w4 holds. In this way, by positioning the electronic component holding portion 224 closer to the electronic component main body portion 74 than to the electronic component connecting portion 444, the load applied to the leg portion 75 by the vibration of the brushless motor 1 can be reduced, and the influence on the electronic component main body portion 74 can be reduced.
However, when the length of w4 is sufficiently short, the electronic component holding portion 224 may be located closer to the electronic component connecting portion 444 than to the electronic component main body portion 74. That is, the relation w3 ≦ w4 may be established. The case where the length of w4 is sufficiently short is, for example, the case where the relational expression w 4. gtoreq.d 3 holds.
And d1 denotes the depth of the accommodating portion 221. d4 represents the height from the bottom surface of the accommodating portion 221 to the end portion of the side wall portion 223 on the side opposite to the bottom surface of the accommodating portion 221. d5 represents the height from the bottom surface of the housing 221 to the end of the leg 75 on the side opposite to the bottom surface of the housing 221. As shown in FIG. 10, d1, d4 and d5 satisfy the relation d1 ≧ d4 ≧ d 5. That is, as shown in fig. 11, the top 2241 of the electronic component holder 224 after the welding is positioned closer to the bottom surface of the housing 221 than the top 2231 of the side gusset 223.
By satisfying the above relational expression, the periphery of the leg portion 75 is covered with the molten resin, and therefore the strength of the leg portion 75 can be maintained by the fusion.
The leg portion 75 may have a bent portion 76 bent in a direction different from the direction in which the electronic component main body portion 74 extends. That is, when the electronic component connecting portion 444 is provided in a direction different from the direction in which the leg portion 75 extends, the distal end of the leg portion 75 can be easily positioned at the electronic component connecting portion 444 by processing the bent portion 76 bent in the different direction before the electronic component (the resistor 721) is accommodated. At this time, the groove portion 222 is formed along the different direction. This makes it possible to effectively utilize the space on the bus bar holder main body 22 as the space for disposing the plurality of electronic components, and to achieve a reduction in size of the brushless motor 1.
Next, a process of forming the electronic component holding portion 224 will be described with reference to fig. 12 to 14. First, in the first step, as shown in fig. 12, the tool 80 is brought close to the groove portion 222 with the leg portion 75 being accommodated in the groove portion 222. The tool 80 has a tip 801 through which a current flows and a support portion 802 that supports the tip 801.
Next, as shown in fig. 13 and 14, a second step of holding the leg portion 75 in the groove portion 222 by welding will be described. In a state where the tool 80 is pressed against the side wall portions 223, a current is caused to flow to the tips 801, thereby generating heat necessary for melting the resin around the side wall portions 223. The side wall portions 223 are melted by the generated heat. The melted resin flows into the gap w2 and covers the periphery of the leg portion 75, forming the electronic component holding portion 224 that holds the leg portion 75 by welding.
In a third step after the electronic component holding portion 224 is formed, the leg portion 75 and the plurality of sensor connecting bus bars 44 are fixed to the electronic component connecting portion 444 by soldering. This completes mounting of the electronic component (resistor 721) on the bus bar unit 20. In this way, after the electronic component holding part 224 is formed, the leg part 75 is fixed to the electronic component connecting part 444 by soldering, so that the leg part 75 is easily positioned with respect to the electronic component connecting part 444, and the fixing strength by soldering in the electronic component connecting part 444 is improved.
As shown in fig. 13 and 14, a gap w5 is formed between the bottom surface 2222 of the groove 222 and the leg 75, but the depth d1 of the receiving portion 221 or the depth d2 of the groove 222 may be appropriately adjusted so that the gap w5 is not required.
The electronic component holding portion 224 may be formed in a part of the groove portion 222, or the electronic component holding portion 224 may be formed in the entire region in the direction in which the leg portion 75 accommodated in the groove portion 222 extends. In the latter case, a large amount of resin necessary for welding can be secured, and the holding strength by welding can be improved.
As shown in fig. 12 to 14, since the tip 801 is curved in a cross-sectional view, the surface of the electronic component holding portion 224 facing the tool 80 is also formed in a curved shape. That is, the surface of the electronic component holding portion 224 has a dome or semi-cylindrical shape in a stereoscopic view. However, the present invention is not limited to this, and the tip 801 may be rectangular in cross-sectional view. That is, the surface of the electronic component holding part 224 may have a prism shape or a cone shape in a stereoscopic view.

Claims (6)

1. A bus bar unit is provided with:
an electronic component having an electronic component main body portion and a leg portion extending from the electronic component main body portion;
a bus bar electrically connected to the electronic component; and
a bus bar holder which supports the bus bar and is formed of an insulating material,
wherein,
the bus bar holder is composed of a bus bar holder body and a connector portion provided radially outward from the bus bar holder body,
the bus bar holder body portion has an electronic component connecting portion that fixes the bus bar and the leg portion by welding,
it is characterized in that the preparation method is characterized in that,
the bus bar holder main body portion includes an electronic component holding portion for holding the leg portion by welding between the electronic component main body portion and the electronic component connecting portion.
2. The bus bar unit according to claim 1,
the electronic component holding part is located closer to the electronic component main body part than to the electronic component connecting part.
3. The bus bar unit according to claim 1,
the electronic component holding part is located closer to the electronic component connecting part than to the electronic component main body part.
4. The bus bar unit according to any one of claims 1 to 3,
the bus bar holder main body includes an accommodating portion accommodating the electronic component main body, a groove portion accommodating the leg portion, and a side wall portion surrounding the leg portion in a direction perpendicular to a direction in which the leg portion extends, and a top portion of the electronic component holding portion is located closer to a bottom surface side of the accommodating portion than a top portion of the side wall portion.
5. The bus bar unit according to any one of claims 1 to 3,
the electronic component holding part is formed over the entire region or a part of the region in the direction in which the leg extends.
6. The bus bar unit according to any one of claims 1 to 3,
the leg portion has a bent portion bent in a direction different from a direction extending from the electronic component main body portion.
CN201320582235.7U 2012-11-01 2013-09-18 Bus bar unit Expired - Lifetime CN203504381U (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012242194A JP2014093835A (en) 2012-11-01 2012-11-01 Bus bar unit
JP2012-242194 2012-11-01

Publications (1)

Publication Number Publication Date
CN203504381U true CN203504381U (en) 2014-03-26

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CN (1) CN203504381U (en)

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Granted publication date: 20140326