Motor drive circuit, motor with built-in drive circuit and pump motor with built-in drive circuit, and air conditioner, ventilator, heat pump water heater, and built-in cold / hot water circulating air conditioner equipped with them

摘要

A motor drive circuit capable of stable motor operation and capable of suppressing abnormal overcurrent protection operation and generation of noise and abnormal noise, a motor with a built-in drive circuit and a pump motor with a built-in drive circuit, and To obtain an air conditioner, ventilation fan, heat pump water heater, and built-in cold / hot water circulation air conditioner equipped with them. A position detection sensor 5 for detecting the position of the rotor, a motor drive unit 7 including an inverter circuit 18 for supplying a drive current to the stator windings, a position detection signal from the position detection sensor 5 and an external input. Based on the output voltage command, a PWM signal generation unit 6 that generates a PWM signal for driving the inverter circuit 18 and an F / that converts the frequency of the position detection signal into a voltage value corresponding to the actual rotational speed of the rotor. A V conversion circuit 61 and an advance angle circuit 46 that controls the advance angle of the output voltage phase of the inverter circuit 18 based on the voltage value are provided.