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1. (WO2017150638) POWER CONVERSION DEVICE, MOTOR DRIVE UNIT, AND ELECTRIC POWER STEERING DEVICE

Pub. No.:    WO/2017/150638    International Application No.:    PCT/JP2017/008189
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Thu Mar 02 00:59:59 CET 2017
IPC: H02P 29/028
B62D 5/04
H02P 25/22
Applicants: NIDEC CORPORATION
日本電産株式会社
Inventors: WADA Eiji
和田 英司
Title: POWER CONVERSION DEVICE, MOTOR DRIVE UNIT, AND ELECTRIC POWER STEERING DEVICE
Abstract:
This power conversion device 100 converts power that is supplied to an electric motor 200 having n phases (n is an integer of 3 or more) of windings. The power conversion device 100 is provided with: a first inverter 110 connected to one end of the winding of each phase of the electric motor; a second inverter 140 connected to the other end of the winding of each phase; a control circuit 300 that performs n-phase energization control of the first inverter 110 and the second inverter 140; and a detection circuit 351 that detects failure of a plurality of switching elements including the first inverter 110 and the second inverter 140. When the detection circuit 351 detects failure of a switching element, the control circuit 300 changes control of the first inverter 110 and the second inverter 140 from the n-phase energization control to m-phase energization control in which m phases (m is an integer of 2 or more but less than n) are used, said m phases being different from the phase of the winding to which the failed switching element is connected among the n phases.