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1. (WO2017187542) ELECTRIC MOTOR DRIVE DEVICE AND AIR CONDITIONER

Pub. No.:    WO/2017/187542    International Application No.:    PCT/JP2016/063146
Publication Date: Fri Nov 03 00:59:59 CET 2017 International Filing Date: Thu Apr 28 01:59:59 CEST 2016
IPC: H02P 27/06
F25B 1/00
H02M 7/48
H02M 7/5387
H02P 25/16
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: ITO, Norikazu
伊藤 典和
SAITO, Katsuhiko
齋藤 勝彦
UMEHARA, Shigeo
梅原 成雄
AMANO, Katsuyuki
天野 勝之
FUKUDA, Masahiro
福田 雅裕
Title: ELECTRIC MOTOR DRIVE DEVICE AND AIR CONDITIONER
Abstract:
The present invention is provided with: the same number of inverter modules 6-8 as the number of phases of an electric motor; and an inverter control unit 4 which generates pulse width modulation (PWM) signals for driving the inverter modules by way of PWM. Three phase outputs of each of the inverter modules are combined to obtain a phase output signal for one phase of the electric motor. Furthermore, capacitors 22, 32, 42 are mounted between control GNDs of the inverter modules 6-8 and power GNDs of the inverter modules. Accordingly, the application of surge voltage to switching elements 9e-9f can be inhibited, even if surge voltage is generated in GND wiring during switching operations of switching elements 9a-9f of the inverter modules.