Detailed structure of small permanent magnet DC motor
A permanent magnet DC motor uses a permanent magnet to establish the magnetic field required by the motor, eliminating the need for an additional power source for excitation. In the motor courseware section, the magnetic field is generated by permanent magnets when introducing the motor principle. The eight-slot DC motor principle model uses a U-shaped permanent magnet to generate a magnetic field. In the past, due to the poor magnetic properties of permanent magnets, the magnetic force is weak and easy to demagnetize. It is only used in some motors with small output, and is often used in toys and teaching instruments. In the past ten years, the rapid development of permanent magnet motors has benefited from the rapid development of permanent magnets. Permanent magnet DC motors have also moved from toys, instrumentation, and home appliances to large-scale motors such as vehicles.
The working principle and structure of permanent magnet DC motor are similar to those of ordinary DC motor, except that the magnetic pole of permanent magnet is used instead of the magnetic pole excited by current. This section introduces the structure of a small permanent magnet DC motor. The basic structure of permanent magnet DC generator is the same. I will not introduce it.
This is a four-pole DC motor. The figure below shows the four permanent magnet poles of the motor, arranged on the same circumference.
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