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Patent Searching and Data


Title:
POWER CONVERSION DEVICE, MOTOR MODULE, AND ELECTRIC POWER STEERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/054026
Kind Code:
A1
Abstract:
Provided is a power conversion device which is capable of executing failure diagnosis on conduction paths on the basis of voltage measurement results. This power conversion device is provided with: a first inverter 120; and a control circuit 300 which controls on/off operations of switch elements in the first inverter, and diagnoses wire breakage failures of winding wires of n phases (n being an integer of 3 or higher). The control circuit generates control signals for turning on one low-side switch element of a first specific phase among n low-side switch elements in the first inverter, turning off the remaining n-1 low-side switch elements, and turning off all of n high-side switch elements, applies the control signals to the n low-side switch elements and the n high-side switch elements while the neutral point of a motor is in a configured state, measures the n-phase voltages which change in accordance with the pattern of wire breakage failures of the winding wires of the n phases, refers to a table in which patterns of wire breakage failures and n-phase voltage levels are associated with each other, and diagnoses wire breakage failures on the basis of the measured n-phase voltages.

Inventors:
KOIKEGAMI TAKASHI (JP)
NAKADA YUHI (JP)
KIKUICHI TAKAHIRO (JP)
KATSUMATA JUN (JP)
TAKANO HIRONORI (JP)
Application Number:
PCT/JP2018/026001
Publication Date:
March 21, 2019
Filing Date:
July 10, 2018
Export Citation:
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Assignee:
NIDEC CORP (JP)
International Classes:
H02P27/06; H02M7/48; H02P29/028
Domestic Patent References:
WO2015156090A12015-10-15
Foreign References:
JP2016123222A2016-07-07
JP2006160030A2006-06-22
JP2017063571A2017-03-30
JPH118992A1999-01-12
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