MOTOR CONTROL DEVICE AND MOTOR DRIVE DEVICE

A sampling period of information according to a load state of an alternating-current motor is controlled so as to be variable with respect to a carrier period of a PWM circuit, and a predetermined arithmetic operation for aggregating information sampled in one period of the carrier period is performed in a separate arithmetic circuit from a CPU. Thereby, in a situation where the rotation of the alternating-current motor becomes too fast with respect to the carrier period, motor rotation control for suppressing a sudden fluctuation of a motor load can be performed by faster reaction while suppressing an increase in an arithmetic control load of a CPU.