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1. (WO2018037454) MOTOR DRIVE DEVICE, HEAT PUMP DEVICE, AND REFRIGERATION AND AIR-CONDITIONING DEVICE

Pub. No.:    WO/2018/037454    International Application No.:    PCT/JP2016/074380
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Tue Aug 23 01:59:59 CEST 2016
IPC: H02P 27/08
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: UEMURA, Keisuke
植村 啓介
HATAKEYAMA, Kazunori
畠山 和徳
SHINOMOTO, Yosuke
篠本 洋介
KOBAYASHI, Takahiko
小林 貴彦
WADA, Yasuhiko
和田 康彦
Title: MOTOR DRIVE DEVICE, HEAT PUMP DEVICE, AND REFRIGERATION AND AIR-CONDITIONING DEVICE
Abstract:
A motor drive device is provided with an inverter 5 and an inverter control unit 8. The inverter control unit 8 receives the input of a DC voltage detected between a DC power supply 1 and the inverter 5 and a current detected between the DC power supply 1 and a motor 4, generates a pulse width modulation signal, and outputs the pulse width modulation signal to the inverter 5 for a switching operation of the same. In the inverter control unit 8, a minimum value of an output voltage frequency after the motor 4 has accelerated is greater than a minimum value of a frequency for switching the number of operation pulses, or a maximum value of the output voltage frequency after the motor 4 has accelerated is smaller than the minimum value of the frequency for switching the number of operation pulses.