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1. (WO2017154498) ELECTRIC DRIVE DEVICE AND ELECTRIC POWER STEERING DEVICE

Pub. No.:    WO/2017/154498    International Application No.:    PCT/JP2017/005637
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Fri Feb 17 00:59:59 CET 2017
IPC: B62D 5/04
H02K 5/04
H02K 9/02
H02K 11/30
Applicants: HITACHI AUTOMOTIVE SYSTEMS, LTD.
日立オートモティブシステムズ株式会社
Inventors: FUJIMOTO, Masao
藤本 政男
Title: ELECTRIC DRIVE DEVICE AND ELECTRIC POWER STEERING DEVICE
Abstract:
The present invention is provided with a heat dissipation base 23 that is adjacent to an electric motor unit EM and extends, near a rotational shaft 50 of an electric motor, in a rotational shaft direction. A substrate 24 of one electronic control means of a redundant system is fixed, in a manner allowing heat transfer, to the heat dissipation base 23, along the direction in which the heat dissipation base 23 extends. A substrate 26 of another electronic control means is fixed, in a manner allowing heat transfer, to the heat dissipation base 23, so as to face the substrate 24 of the one electronic control means. Heat from the substrate 24, 26 of each electronic control means dissipates to a motor housing 20 via the heat dissipation base 23. The invention can thus be made more compact by reducing the size in a radial direction, and furthermore, because heat is dissipated to the housing of the electric motor unit via the heat dissipation base, the heat from the substrates can be efficiently dissipated externally.