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Patent Searching and Data


Title:
ELECTRIC MOTOR DRIVE DEVICE, REFRIGERATION CYCLE DEVICE, AIR CONDITIONER, WATER HEATER, AND REFRIGERATOR
Document Type and Number:
WIPO Patent Application WO/2019/087243
Kind Code:
A1
Abstract:
This electric motor drive device (2) has: a connection switching device (60) for switching the connection states of the windings (71-73) of an electric motor (7) by performing switching operation on switches (61-63) during rotational operation of the electric motor (7); an inverter (30) which applies AC voltage to the windings (71-73) via the switches (61-63) and to which counter electromotive voltage is applied from the windings (71-73) of the electric motor (7) in rotating operation via the switches (61-63); and a control device (100) for controlling the rotational operation of the electric motor (7) by controlling the inverter (30) and the connection switching device (60). The switching operation of the switches (61-63) is executed within a current control period in which the first effective values of AC currents flowing through the windings (71-73) are made closer to zero than the second effective value of the AC currents flowing through the windings (71-73) before the switching operation of the switches (61-63).

Inventors:
HATAKEYAMA KAZUNORI (JP)
TOYODOME SHINYA (JP)
TAKAHASHI KENJI (JP)
HONGYO AKANE (JP)
Application Number:
PCT/JP2017/039117
Publication Date:
May 09, 2019
Filing Date:
October 30, 2017
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H02P27/06; H02P25/18
Domestic Patent References:
WO2011087126A12011-07-21
Foreign References:
JPH06217596A1994-08-05
JP2016086587A2016-05-19
Attorney, Agent or Firm:
MAEDA Minoru et al. (JP)
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