Discuss the advantages and disadvantages of permanent magnet DC motor in detail

As a miniature DC motor, permanent magnet DC motor is widely used in our life, but do you really understand it? Today, Shandong electric machinery factory will tell you the advantages and disadvantages of developing permanent magnet DC motors!

The advantages of permanent magnet DC motor are:

1. Excitation device is not required

2. The input power for excitation is not consumed, so the efficiency of DC motor is improved

3. There is no excitation coil, so the space of the excitation coil is saved, which reduces the overall size of the motor.

4. For applications where the rated power does not exceed kW, it is cheap and economical.

The disadvantages of permanent magnet DC motor are:

1. The armature reaction of the DC motor cannot be compensated, so the magnetic field strength of the magnetic field may become weak due to the demagnetization of the armature reaction.

2. Under the starting, reversing and overload conditions of the motor, due to the excessive armature current, it is very possible to permanently demagnetize (some magnetic poles).

3. The magnetic field in the air gap is fixed and restricted - it cannot be controlled from the outside. This makes it difficult for this type of motor to achieve effective speed control of DC motor, and this type of motor is difficult.

Application of permanent magnet DC motor:

It is widely used in places that need small DC motors and do not need control, such as car starters, toys, wipers, washing machines, hot air conditioners, air conditioners, computer disk drives, etc.