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Patent Searching and Data


Title:
ELECTRIC MOTOR CONTROL DEVICE, AND AIR CONDITIONING DEVICE COMPRISING SAME
Document Type and Number:
WIPO Patent Application WO/2020/217310
Kind Code:
A1
Abstract:
This electric motor control device includes: a power conversion device for supplying a three-phase voltage to two electric motors that are connected to each other in parallel; three-phase power lines for connecting one electric motor among the two electric motors to the power conversion device; branched three-phase power lines which connect the other electric motor of the two electric motors to the power conversion device, and which are branched from the three-phase power lines; a switching device which is provided to power lines of two phases among the branched three-phase power lines, and which comprises two switches for putting the power lines into an ON state where the power lines are electrically connected or an OFF state where the power lines are disconnected; a current detection device for detecting three-phase current flowing to the two electric motors; and a control device. The control device includes: a failure determination means for determining a failure of the switching device by identifying a phase of a power line through which current is not flowing among the three-phase power lines and the branched three-phase power lines; and a switching control means for performing control such that, when it is detected that one switch has failed among the two switches, the ON state or the OFF state of the normally operating switch becomes the same state as the failed switch.

Inventors:
ASAI TOSHIKI (JP)
TSUMURA AKIHIRO (JP)
WADA YASUHIKO (JP)
MORIMOTO JUNJI (JP)
TAKATA SHIGEO (JP)
Application Number:
PCT/JP2019/017218
Publication Date:
October 29, 2020
Filing Date:
April 23, 2019
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H02P29/024; H02P5/46; H02P27/06
Foreign References:
JP2008148415A2008-06-26
JPS5120041B21976-06-22
JPS5445741A1979-04-11
JPS6115594A1986-01-23
Attorney, Agent or Firm:
KISA PATENT & TRADEMARK FIRM (JP)
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