Invention Grant
- Patent Title: Motor drive apparatus including short-circuit judgment unit for DC link capacitor
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Application No.: US16408846Application Date: 2019-05-10
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Publication No.: US11005409B2Publication Date: 2021-05-11
- Inventor: Akinori Satou , Shinichi Horikoshi
- Applicant: Fanuc Corporation
- Applicant Address: JP Yamanashi
- Assignee: Fanuc Corporation
- Current Assignee: Fanuc Corporation
- Current Assignee Address: JP Yamanashi
- Agency: RatnerPrestia
- Priority: JPJP2018-105100 20180531
- Main IPC: H02P29/024
- IPC: H02P29/024 ; H02P27/06

Abstract:
A motor drive apparatus includes a converter which converts AC power into DC power and outputs it to a DC link, an inverter which converts the DC power of the DC link into AC power for driving a motor, DC link capacitors connected in series with each other, resistors connected in parallel with the DC link capacitors and connected in series with each other, a DC link voltage detection unit, a current-carrying element which is connected between one of connection points connecting the DC link capacitors to each other and one of connection points connecting the resistors to each other, and carries a current when the applied voltage is higher than a predetermined value, and a short-circuit judgment unit which judges that at least one of the DC link capacitors has shorted when the DC link voltage value is larger than an upper limit or smaller than a lower limit.
Information query
IPC分类: