MOTOR CONTROL APPARATUS, HEAT PUMP SYSTEM, AND AIR CONDITIONER

摘要

With a motor control apparatus according an embodiment of the present invention, a current detection control unit: sets a first detection scheme wherein a two-phase PWM signal is outputted if a current detection rate is high when the motor is in a low rotation range and wherein a current detection unit detects a current with one phase at fixed timing and the other one phase at variable timing; and that sets a second detection scheme wherein a three-phase PWM signal is outputted when the current detection rate is low and wherein the current detection unit detects the current of two phases at a fixed timing. The current detection control unit sets a third detection scheme wherein, when the current detection rate is in an intermediary state, the two-phase PWM signal is outputted, and wherein, in a state where current detection of one phase is set at a variable timing, two phases with a duty pulse outputted in a carrier wave period are a second phase and a third phase, and when the duty of one of these two phases decreases, making detection of the current of the two phases impossible, a duty pulse of a first phase is generated by a prescribed value, a duty pulse of the second phase and the third phase is increased by the prescribed value, and current detection of the other one phase is also set at a variable timing.