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Title:
ELECTRIC MOTOR DRIVE DEVICE AND AIR CONDITIONER
Document Type and Number:
WIPO Patent Application WO/2021/166124
Kind Code:
A1
Abstract:
An electric motor drive device (150) has: a switching unit (60) provided with a plurality of mechanical relays (61, 62, 63) that switch the connection state of a stator winding of an electric motor (70) to a star connection or a delta connection; an inverter (50) that applies electric power to the electric motor (70); and a control unit (90) that controls the switching unit (60), the control unit (90) causing the switching unit (60) to stop the switching of the connection state when the cumulative number of switchings, indicating the number of times the connection state was switched by the switching unit (60), is greater than or equal to a switching life number, which is a number of switchings at which it can no longer be guaranteed that the electrical opening/closing operation of the mechanical relays (61, 62, 63) is correctly performed.

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Inventors:
TOKUDA YUTA (JP)
KOBAYASHI TAKAHIKO (JP)
KAWASHIMA ATSUSHI (JP)
Application Number:
PCT/JP2020/006551
Publication Date:
August 26, 2021
Filing Date:
February 19, 2020
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H02P25/18; F25B1/00; H02P27/06
Domestic Patent References:
WO2019021448A12019-01-31
Foreign References:
JP2013110839A2013-06-06
Attorney, Agent or Firm:
TAKAMURA, Jun (JP)
Download PDF:
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