CARRIER FREQUENCY SETTING METHOD, MOTOR DRIVING SYSTEM, AND CARRIER FREQUENCY SETTING DEVICE

摘要

The present invention can drive a motor so that a combined loss of motor loss and inverter loss is reduced. In a relationship between an optimal carrier frequency, at which the combined loss is minimized, and a torque of a motor M, the present invention derives the lowest value of the optimal carrier frequency and determines a relationship between the torque of the motor M and the carrier frequency so that there is a portion in which while the torque of the motor M increases, the carrier frequency is approximately the same or decreases, in a range in which the torque of the motor M is equal to or smaller than the torque corresponding to the lowest optimal carrier frequency, and there is a portion in which while the torque of the motor M increases, the carrier frequency is approximately the same or increases, in a range in which the torque of the motor M is equal to or larger than the torque corresponding to the lowest optimal carrier frequency.