Permanent magnet motor is dc motor and ac motor
Permanent magnet motor can be used as dc motor (dc motor and dc generator), as well as ac motor (ac motor and alternator). Make it easy to understand, dc motor made ac motor may be more difficult to understand, in fact, alternator is well understood, will made the rotor magnetic pole, the rotor rotation is not rotating magnetic field? You can send alternating current. Ac motor can also understand that synchronous motor is not the rotor is the pole. It can also be made permanent. So, permanent magnet motor can be a dc motor or ac motor.
Because ac motor requires changing magnetic field, such ability and the frequency of the alternating current (ac) together to make the rotor rotation, so the ac motor may not use a permanent magnet. The magnetic field of dc motors can be constant, so you can use permanent magnets.
Who says ac motors can't use permanent magnets? The permanent magnet field is synchronized with the rotating magnetic field, which is the permanent magnet synchronous ac motor.
A permanent magnet can be a dc motor or ac motor (for example, a home breeze fan). In the same way, no permanent magnet can be either a dc motor or ac motor, or even an alternating current. In contrast to electric excitation motor, permanent magnet motor, especially rare earth permanent magnet motor, has simple structure and reliable operation. Small volume and light weight; Small losses and high efficiency; Flexible and varied in shape and size of the motor and other significant advantages, and application scope is extremely broad, almost throughout the aerospace, defense, the areas of industrial and agricultural production and daily life.
