Title:
MOTOR DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/030290
Kind Code:
A1
Abstract:
This motor drive device (10) comprises: a PWM drive control unit (4) for generating a PWM signal (Spwm) on the basis of a rotation speed signal (FG) indicating the rotation speed of a motor (20) and a speed command signal (S1) indicating the target rotation speed; and a driver (5) for generating a drive signal (Sdr) to be applied to the motor on the basis of the PWM signal. Until it is detected, on the basis of the rotation speed signal and the speed command signal, that the rotation speed of the motor has reached the target rotation speed, that the rotation speed of the motor has reached the target rotation speed, the PWM drive control unit generates the PWM signal so that the PWM frequency is at a first PWM frequency lower than a second PWM frequency. When it is detected that the rotation speed of the motor has reached the target rotation speed, the PWM drive control unit switches the PWM frequency to the second PWM frequency.
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Inventors:
KUNIDA YUJI (JP)
Application Number:
PCT/JP2021/027629
Publication Date:
February 10, 2022
Filing Date:
July 27, 2021
Export Citation:
Assignee:
ROHM CO LTD (JP)
International Classes:
H02P6/28; H02P21/22; H02P27/08
Foreign References:
| JPH07222478A | 1995-08-18 | |||
| JPH03198679A | 1991-08-29 | |||
| JP2018057084A | 2018-04-05 | |||
| JP2009194950A | 2009-08-27 |
Attorney, Agent or Firm:
SANO PATENT OFFICE (JP)
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