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Motor drive apparatus

A motor drive and motor technology, applied in the field of motor drive devices, can solve the problems of insufficient heat radiation performance of heat sinks and the like

Active Publication Date: 2013-10-23
DENSO CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in this motor drive device, the heat sink is enclosed in the housing, and thus the heat radiation performance of the heat sink is insufficient

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0017] Referring to the first embodiment shown Figure 1 to Figure 5 , the motor drive device 1 is used in an electric power steering system (EPS). The motor drive device 1 is used in EPS of a vehicle and includes a motor 20 , an end frame 31 and an electronic control unit 40 . By arranging the shaft 24 parallel to the axis of the rack 10, the motor drive 1 is attached relative to the rack 10 connecting the left and right wheels 9 of the vehicle. When the driver operates the steering wheel 5 , the torque generated in the steering shaft 6 by the steering operation is detected by the torque sensor 7 . The motor drive device 1 generates torque for assisting a steering operation based on a signal output from a torque sensor 7 and a vehicle speed signal transmitted from a CAN (Controller Area Network) or the like. This torque is transmitted from the output end 242 of the shaft 24 of the motor 20 to the rack 10 through the gear 8 to the rack 10 .

[0018] Electronic control unit ...

no. 2 approach

[0058] According to the second embodiment, the motor drive device such as Image 6 Constructed as shown.

[0059] Specifically, the end frame 32 has concavo-convex portions 321 formed on radially outer wall surfaces (outer wall surfaces) of the side walls of the end frame 32 . The concavo-convex portion 321 includes a convex portion 322 and a concave portion 323 . The protrusion 322 protrudes on the side wall in a radially outward direction and extends longitudinally, ie in the direction of the axis of rotation O. As shown in FIG. The concave portion 323 is recessed on the convex portion 322 in a radially inward direction and extends in the direction of the rotation axis O. As shown in FIG. The convex portions 322 and the concave portions 323 are alternately arranged in the circumferential direction.

[0060] Since the concavo-convex portion 321 is formed on the radially outer wall surface of the side wall of the end frame 32 , the surface area of ​​the outer wall surface o...

no. 3 approach

[0062] According to the third embodiment, the motor drive device such as Figure 7 Constructed as shown.

[0063] Specifically, the end frame 33 has a concavo-convex portion 331 formed on the radially outer wall surface of the side wall of the end frame 33 . The concavo-convex portion 331 includes a convex portion 332 and a concave portion 333 . The protrusion 332 protrudes on the side wall in the radially outward direction and extends in the circumferential direction. The recess 333 is recessed on the side wall in the radially inward direction and extends in the circumferential direction. The protrusions 332 and the recesses 333 are arranged alternately in the direction of the axis of rotation O. As shown in FIG.

[0064] Since the concavo-convex portion 331 is formed on the radially outer wall surface of the side wall of the end frame 33 , the surface area of ​​the outer wall surface of the side wall of the end frame 33 is increased. Therefore, the heat radiation perform...

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Abstract

A motor drive apparatus includes a motor having a shaft, an end frame, and a control unit having a heat sink. The end fame and the heat sink are arranged to overlap at least partly when the end frame and the heat sink are projected on a plane, which is parallel with a rotation axis of the shaft. This arrangement improves heat radiation performance of the motor drive apparatus.

Description

technical field [0001] The present disclosure relates to a motor drive device in which a motor and an electronic control unit for controlling the motor are integrated. Background technique [0002] In some motor drive devices used in conventional electric power steering systems (EPS) that assist the driver's steering operation with the driving force of the motor, the motor and the electronics for controlling the motor The control unit is one piece. For example, in a motor drive device according to JP2011-177001A (US2011 / 0018374A1), a semiconductor module is provided on a heat sink to facilitate heat radiation. [0003] However, in the motor drive device, the heat sink is enclosed within the housing, and thus the heat radiation performance of the heat sink is insufficient. Contents of the invention [0004] Accordingly, an object of the present invention is to provide a motor drive device capable of improving heat radiation performance. [0005] According to one aspect, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K11/00H02K9/22
CPCH02K11/0073H02K9/22H02K11/33H02K9/227
Inventor 坪井贵志若菜刚志
Owner DENSO CORP
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