CONTROLLER OF VOLTAGE DRIVEN PWM INVERTER

摘要

PROBLEM TO BE SOLVED: To obtain a voltage driven PWM inverter for controlling a motor in which the control performance and durability of an inverter element are enhanced.

SOLUTION: When the output frequency ωm of an inverter (proportional to a rotational speed) multiplied by a constant Kf is lower than a PWM carrier frequency Fpl at the time of low rotation, a PWM carrier frequency Fp is decreased gradually to Fpl (S1-S4→S8) and when it is not lower than the PWM carrier frequency Fpl at the time of low rotation, the PWM carrier frequency Fp is increased gradually to FpH (S1→S5-S7→S8).

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