INVERTER CONTROL METHOD AND MOTOR CONTROL METHOD

PROBLEM TO BE SOLVED: To provide a technology of suppressing component cost of computing elements as well as a smoothing capacitor by suppressing the capacity of the smoothing capacitor and simplifying required computation for control while avoiding or suppressing an adverse effect of a ripple voltage on motor driving, in a motor subjected to inverter control.SOLUTION: The motor control method, controlling a motor by modulating a DC voltage obtained by full-wave rectifying and smoothing a polyphase AC, sequentially implements: a variation coefficient acquisition process S102 that acquires a coefficient of variation of a DC voltage; a control cycle setting process S104 that sets a cycle for controlling the coefficient of variation of the DC voltage on the basis of a predetermined value as a variation margin of the DC voltage and the coefficient of variation; and a variation coefficient correction process S106 that corrects the coefficient of variation for each cycle.