A permanent magnet motor is a DC motor in which the stator is a permanent magnet and only the rotor is a coil. Whereas in a normal motor the stator is the coil.
1, the nature of the magnetic field. permanent magnet motor is made without external energy to maintain its magnetic field; ordinary motors need electric current into the magnetic field.
2, rotor structure. permanent magnet motor rotor installed with permanent magnet poles; ordinary motor rotor installed excitation coil.
3, applicable occasions. Permanent magnet motors are usually used in small power occasions; ordinary motors, especially excitation motors, are often used in high-power occasions.
The forms of permanent magnet motor are:
(1) rectangular pulse wave current, permanent magnet brushless DC motor PMBDC has rectangular pulse wave current.
(2) Sine wave current, permanent magnet reluctance synchronous motor PSM has sinusoidal wave current.
(3) Hybrid permanent magnet motor.
Permanent magnet motor and electric excitation motor compared to the permanent magnet motor, permanent magnet motor, especially rare earth permanent magnet motor has a simple structure, reliable operation; small size, light weight; small loss, high efficiency; the shape and size of the motor can be flexible and diverse and so on the significant advantages of the motor, and therefore the scope of application is extremely wide, almost all over the aerospace, national defense, industry and agriculture and production and daily life of the various fields.