Darren
May 31Permanent magnet synchronous motors are classified according to their power supply frequency: permanent magnet brushless DC motors (supplied by square wave inverters) and permanent magnet brushless AC motors (supplied by sine wave inverters), both of which require variable frequency power supply during motor operation. According to the distribution of air gap magnetic field, it is divided into sine wave permanent magnet synchronous motors (referred to as permanent magnet synchronous motors) and trapezoidal wave permanent magnet synchronous motors (brushless DC motors). A permanent magnet synchronous motor is an AC motor powered by an AC power source, but a brushless DC motor can be directly powered by a DC power source. If an AC power source is used, it must first be converted into DC power through a converter and input into the driver power supply. Finally, the converter converts the DC voltage into three-phase voltage to drive the motor. Therefore, the final drive for the motor is still AC power.