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

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 toor 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 thesame 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. 使得能够以马达的损失和变换器的损失的合计损失变小的方式驱动马达。在合计损失成为最小的最佳载波频率与马达(M)的转矩的关系中，导出最佳载