Patent ID: 11888422
Assignee: NIPPON STEEL CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. A motor driving system comprising:
an inverter;
a motor which is driven with reception of supply of AC power from the inverter; and
a controller which controls an operation of the inverter,
wherein the inverter has a switching element configured using a semiconductor other than a wide band gap semiconductor,
wherein the controller has a carrier frequency setting unit which sets a carrier frequency of the inverter based on a relationship between a torque of the motor and the carrier frequency in the inverter derived for each rotation speed of the motor, and
wherein in the relationship between the torque of the motor and the carrier frequency, derived for each rotation speed of the motor, the carrier frequency has a substantially constant value regardless of the torque of the motor.