Inverter device and drive unit using the same

An inverter and radiator technology, applied in the field of drive units and inverter devices, can solve problems such as temperature rise, failure or failure of power components, reduce wiring impedance, reduce power loss, and shorten wiring distance. Effect

Inactive Publication Date: 2011-11-23
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a possibility of failure or malfunction due to temperature rise of power components

Method used

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  • Inverter device and drive unit using the same
  • Inverter device and drive unit using the same
  • Inverter device and drive unit using the same

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0056] Figures 1 to 18 An inverter device and a drive unit using the inverter device according to a first embodiment of the present invention are shown. The drive unit 1 according to the present embodiment is applied to an electric power steering system. The drive unit 1 has an electric motor 2 and an inverter device 4 . The inverter device 4 includes a control board assembly 90, a heat sink 80, a plurality of power elements mounted on the heat sink 80, a power substrate assembly 40, and the like. The control board assembly 90 corresponds to a control wiring portion according to the present invention. The power substrate assembly 40 corresponds to a power wiring portion according to the present invention.

[0057] First, refer to figure 1 Describes the electrical structure of the electric power steering system. The electrical configurations described below are generally also used in subsequent embodiments. Such as figure 1 As shown, the drive unit 1 generates torque in...

no. 2 approach

[0114] Next, refer to Figures 19 to 21 An inverter device according to a second embodiment of the present invention will be described. The inverter device 3 according to the second embodiment is applied to a single drive unit system. The upper arm unit 50 including the power elements 51 - 54 is attached to the outer surface 831 of one heat slug 811 of the heat sink 80 . The lower arm unit 59 including the power elements 55 - 58 is attached to the outer surface 832 of the other slug 812 of the heat sink 80 . In this way, the upper arm unit 50 and the lower arm unit 59 are arranged on different planes. The second embodiment exerts the effects (1) to (4), (6) and (7) of the first embodiment.

no. 3 approach

[0116] Next, an inverter device according to a third embodiment of the present invention will be described with reference to FIGS. 22 to 24 . The inverter device according to the third embodiment is applied to a two drive unit system. Unlike the first embodiment, the power elements 51-58, 61-68 are not mounted on the unit base. The power elements 51-58, 61-68 are individually attached to the heat sink 80 by screws 73 or adhesive.

[0117] In this case, if the power elements whose drain electrodes are exposed are directly attached to the heat sink 80, the power elements are short-circuited to each other. Therefore, it is necessary to insert the insulating sheet 74 between the drain electrode 78 and the heat sink 80 . The insulating sheet 74 is a thin plate made of an insulating material such as silicon. Alternatively, a power element having a drain electrode coated and insulated by resin may be employed. The third embodiment exerts the effects (1) to (5) of the first embodi...

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Abstract

The invention provides an inverter device and a drive unit using the same. In two systems of three-phase alternating-current inverter devices that drive a motor, power elements on power supply sides of bridge circuits are mounted on unit bases to constitute upper arm units. Power elements on ground sides of the bridge circuits are mounted on unit bases to constitute lower arm units. The upper arm units and the lower arm units are arranged separately on upper surfaces and outside surfaces of heat dissipation blocks of a heat sink. Heats generated by the power elements do not interfere with each other and are emitted to the heat sink, whereby heat dissipation performance of the power elements constituting the bridge circuits is improved.

Description

technical field [0001] The present invention relates to an inverter device for generating multi-phase alternating current from direct current and a drive unit using the inverter device. Background technique [0002] Generally, an electric steering system for assisting steering operated by a driver is known to the public. An inverter device that generates alternating current from direct current is used as a controller for controlling the drive of a motor in an electric power steering system. The inverter device is constructed by mounting electronic components such as semiconductor power devices such as transistors, resistors, and capacitors on a power substrate. For example, in Patent Document 1 (JP-A-2004-237832) and Patent Document 2 (JP-A-2008-029093), a control unit and electric energy conversion applied to an electric power steering controller and corresponding to an inverter device are described. device. [0003] In the control unit for electric power steering descri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02P27/06
CPCH02M7/003Y02T10/7241B60L2210/46Y02T10/641H05K7/209B60L2220/58Y02T10/64Y02T10/72
Inventor 安部达也山崎雅志
Owner DENSO CORP
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