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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/2019/053992
Kind Code:
A1
Abstract:
Provided is a power conversion device which is capable of identifying which of a plurality of switch elements has failed. 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 executes first failure diagnosis in which control signals for turning off all n low-side switch elements and n high-side switches are generated, the control signals are applied to the n low-side switch elements and the n high-side switch elements, the n-phase voltages which change in accordance with the pattern of on failures of the switch elements are measured, a table in which patterns of on failures of the switch elements and n-phase voltage levels are associated with each other is referred to, and on failures of the n low-side switch elements and the n high-side switches are diagnosed on the basis of the measured n-phase voltages.

Inventors:
KOIKEGAMI, Takashi (2-8 Shin-Kawasaki, Saiwai-ku, Kawasaki-sh, Kanagawa 32, 〒2120032, JP)
NAKADA, Yuhi (338 Kuzetonoshiro-cho Minami-ku, Kyoto-sh, Kyoto 05, 〒6018205, JP)
NABESHI, Kaori (338 Kuzetonoshiro-cho Minami-ku, Kyoto-sh, Kyoto 05, 〒6018205, JP)
Application Number:
JP2018/023733
Publication Date:
March 21, 2019
Filing Date:
June 22, 2018
Export Citation:
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Assignee:
NIDEC CORPORATION (338 Kuzetonoshiro-cho, Minami-ku Kyoto-sh, Kyoto 05, 〒6018205, JP)
International Classes:
H02M7/48; B62D5/04; H02P27/06
Domestic Patent References:
WO2017030020A12017-02-23
Foreign References:
JP2016082750A2016-05-16
JP2009055657A2009-03-12
JP2015089294A2015-05-07
US20130320903A12013-12-05
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