Title:
MOTOR DRIVE DEVICE HAVING OVERVOLTAGE PROTECTION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2023/007747
Kind Code:
A1
Abstract:
This motor drive device comprises: a motor drive circuit that drives a synchronous motor by supplying AC power to the synchronous motor via power lines; an overvoltage protection circuit that short-circuits between the phases of the power lines by turning on a semiconductor switch when driving of the synchronous motor by the motor drive circuit is stopped and prevents the occurrence of overvoltage due to a back electromotive force between the terminals of the synchronous motor; and a temperature estimation unit that calculates a temperature estimation value of the semiconductor switch by using a motor constant and a semiconductor switch constant, said motor constant including at least one of the inertia and back electromotive force constants of the synchronous motor, said semiconductor switch constant including the on-resistance, thermal resistance, and thermal time constant of the semiconductor switch.
Inventors:
SASAKI TAKU (JP)
Application Number:
PCT/JP2021/028495
Publication Date:
February 02, 2023
Filing Date:
July 30, 2021
Export Citation:
Assignee:
FANUC CORP (JP)
International Classes:
H02P3/18; H02H7/12; H02H7/122; H02H9/04; H02P3/12
Foreign References:
| JP2011062035A | 2011-03-24 | |||
| JP2017200337A | 2017-11-02 | |||
| JP2017153327A | 2017-08-31 | |||
| JP2012050332A | 2012-03-08 | |||
| JP2010200490A | 2010-09-09 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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