Motor drive unit

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8803462
APP PUB NO 20120313561A1
SERIAL NO

13580585

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A switching element is switched off after having been switched on for only a short time interval called a first predetermined time interval, and a determination is made, based on a mode of a change in a contact point potential (a regeneration voltage) between an electric motor and the switching element when the switching element as switched off, as to whether or not one of the electric motor and the switching element has failed. Next, the switching element is switched on for a time interval called a second predetermined time interval, which is longer than the first predetermined time interval, and a determination is made, based on the magnitude of the contact point potential at that time, as to which one of the electric motor and the switching element has failed. It is thus possible for a failure of the switching element and electric motor to be detected.

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Patent Owner(s)

  • ADVICS CO., LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Okamoto, Isao Takahama, JP 36 406

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