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A motor drive apparatus

A technology of motor drive and motor, which is applied in the field of motor drive devices, and can solve problems such as the deviation of the rotation axis and the inability of the control circuit to detect the rotation angle of the rotor

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

AI Technical Summary

Problems solved by technology

[0005] However, according to the electric power steering system (EPS) described above, the position of the rotation angle sensor mounted on the control unit board is very difficult due to the gap between the hole of the motor case and the post or the gap between the threaded hole of the radiator and the bolt. Possibly offset from the axis of rotation of the shaft
When the relative position between the rotation angle sensor and the magnet deviates, the control circuit may not be able to accurately detect the rotation angle of the rotor from the detection signal of the rotation angle sensor

Method used

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no. 1 approach ）

[0021] First refer to figure 1 and figure 2 , the motor drive device 1 is used in an electric power steering system (EPS) that assists a vehicle driver's steering operation by a driving force of a motor. The motor drive device 1 includes a motor unit 2 and an electronic control unit 3 . The motor drive 1 is attached to a rack 5 connecting left and right tire wheels 4 in the engine room. The output portion 10 of the motor drive 1 and the speed reducer 6 that moves the rack 5 in the axial direction are coupled by a belt 20 . The output part 10 may be a gear.

[0022] When the steering wheel 7 is operated by the driver, the torque generated in the steering shaft 8 by the steering operation is detected by the torque sensor 9 . Based on a detection signal output from the torque sensor 9 , a vehicle speed signal transmitted from a CAN (Controller Area Network), and the like, the motor drive device 1 generates torque for assisting a steering operation. When this torque is trans...

no. 2 approach ）

[0053] A second embodiment of the drive device 1 is in Figure 10 shown in . Basically the same structures as those of the first embodiment are denoted by the same reference numerals, thereby simplifying the description.

[0054] In the second embodiment, at least two protrusions 930 are formed on the rear end frame 93 so as to extend from the partition wall 97 toward the control unit substrate 43 side. The protrusions 930 are fitted in at least two grooves 430 provided on the control unit substrate 43 . The outer diameter of the protrusion 930 is equal to or slightly smaller than the inner diameter of the groove 430 . Therefore, the protruding portion 930 of the rear end frame 93 and the groove 430 of the control unit substrate 43 are tightly fitted in a plug-in manner. In the second embodiment, the relative position between the rear frame 93 and the control unit substrate 43 is determined by fitting the protrusion 930 of the rear frame 93 into the groove 430 of the contro...

no. 3 approach ）

[0056] Figure 11 A third embodiment of the motor drive is shown.

[0057] Figure 11 is only a schematic view showing the rear end frame 93 and the control unit substrate 43 as viewed in the axial direction of the shaft 83 . In the third embodiment, the third socket fitting surface 931 as the inner fitting surface is formed on the radially inner side wall surface of the cylindrical wall 96 of the rear end frame 93 . The third socket fitting surface 931 is formed cylindrically such that its center is on the rotation axis of the shaft 83 . A fourth spigot fitting surface 431 as an outer side fitting surface is formed on the control unit substrate 43 to correspond to the third spigot fitting surface 931 of the rear end frame 93 . The fourth socket fitting surface 431 is formed in an arc shape whose radial center is on the rotation axis of the shaft 83 . The radius of the third plug fitting surface 931 is equal to or slightly larger than the radius of curvature of the fourth ...

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Abstract

A motor drive apparatus includes a rear end frame between a motor case and a control unit case. A shaft of a motor unit is supported rotatably by a bearing fixed to the rear end frame. A first socket-spigot fitting surface formed on the rear end frame is fitted with a second socket-spigot fitting surface formed on a heat sink. A rotation angle sensor mounted on a control unit substrate attached to the heat sink is provided on the rotation axis of the shaft. The rotation angle sensor can thus accurately detect the magnetic field of a magnet provided at the end of the shaft.

Description

technical field [0001] The invention relates to a motor drive device in which a motor unit and a control unit [0002] elements are integrated. Background technique [0003] Conventional Electric Power Steering (EPS) assists the driver's steering operation with the driving force of a motor. [0004] The electric power steering system (EPS) disclosed in JP 2011-176998A (US 2011 / 0018374 A1) uses a motor drive device in which an electronic control unit is provided on one axial side of the motor in the axial direction of the motor place. In this motor drive device, a motor case housing a motor therein has a hole provided at one axial end of the motor case on the control unit side, and a post inserted from the motor side. The bolts are inserted into threaded holes provided in the heat sink forming the control unit, and are threadedly engaged with the posts. The radiator is thus attached to the motor housing. A rotation angle sensor is mounted on the control unit substrate at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K11/00H05K5/02H05K7/20
CPCH02K29/08H02K11/0073B60L2220/50B60L2240/421B60L2240/423H02K11/33Y02T10/64
Inventor 富泽弘贵林二郎今井博史
Owner DENSO CORP
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