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Patent Searching and Data


Title:
MOTOR DRIVE SYSTEM AND MOTOR DRIVE METHOD
Document Type and Number:
WIPO Patent Application WO/2022/085109
Kind Code:
A1
Abstract:
This motor drive system of an embodiment comprises a power converter, a status detector, a frequency calculator, a frequency correction command generator, a drive amount limiter, and a speed controller. The power converter drives the motor using PWM control. The status detector detects the drive status of the motor. The frequency calculator uses an index value indicating the drive status to detect the size of a specific frequency component that fluctuates depending on the drive status. The frequency correction command generator generates a command for correcting the carrier frequency used in the PWM control on the basis of the detection result for the periodic fluctuation of the drive status. The drive amount limiter limits the drive amount of the motor. When searching in the direction of raising the carrier frequency, the drive amount limiter adjusts in a direction in which the upper limit of the size of the current flowing in the winding of the motor is made less than a preset upper limit current value. The speed controller generates a current reference that is based on the speed command value and the rotor speed of the motor according to the limit.

Inventors:
SUZUKI SHINYA (JP)
TOBAYASHI SHUNSUKE (JP)
Application Number:
PCT/JP2020/039536
Publication Date:
April 28, 2022
Filing Date:
October 21, 2020
Export Citation:
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Assignee:
TOSHIBA MITSUBISHI ELEC IND (JP)
International Classes:
H02P7/08
Foreign References:
JP2015091186A2015-05-11
JP2014036446A2014-02-24
JP2009142112A2009-06-25
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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