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1. (WO2018087965) ELECTRIC DRIVE DEVICE AND ELECTRIC POWER STEERING DEVICE

Pub. No.:    WO/2018/087965    International Application No.:    PCT/JP2017/027591
Publication Date: Fri May 18 01:59:59 CEST 2018 International Filing Date: Tue Aug 01 01:59:59 CEST 2017
IPC: H02K 11/33
B62D 5/04
H02K 9/02
Applicants: HITACHI AUTOMOTIVE SYSTEMS, LTD.
日立オートモティブシステムズ株式会社
Inventors: HAMADA, Keiji
濱田 啓二
Title: ELECTRIC DRIVE DEVICE AND ELECTRIC POWER STEERING DEVICE
Abstract:
The present invention is provided with a power conversion switching circuit-side heat radiation portion (15A) and a power supply circuit-side heat radiation portion (15B), which are formed on an end surface portion of a motor housing (11) on the side opposite to an output shaft portion (14) of a rotation shaft of an electric motor. A power conversion switching circuit board, on which a power conversion switching circuit unit (16) obtained by providing, in a package, an upper arm-side switching element and a lower arm-side switching element that form a power conversion circuit unit is mounted, is attached to the power conversion switching circuit-side heat radiation portion (15A) such that heat can be released; and a power supply circuit board, on which the power conversion circuit unit excluding the upper arm-side switching element and the lower arm-side switching element, and a power supply circuit unit are mounted, is attached to the power supply circuit-side heat radiation portion (15B) such that heat can be released.