What is the Difference between Permanent Magnet Motors and Ordinary Motors

There are several main differences between permanent magnet motors and ordinary motors:

The magnetic field properties are different: permanent magnet motors can maintain their magnetic field without the need for external energy, while ordinary motors require current to enter in order to have a magnetic field.

The rotor structure is different: permanent magnet motors have permanent magnet poles installed on the rotor, while ordinary motors have excitation coils installed on the rotor.

Different application scenarios: Permanent magnet motors are usually used in low-power applications, while ordinary motors, especially excitation motors, are often used in high-power applications.

The working principle is different: permanent magnet motors generate torque through the interaction between permanent magnets and electrical coils, while ordinary motors use the magnetic field generated by energized coils and the magnetic torque acting on the rotor to drive the rotor to rotate.

Overall, permanent magnet motors differ from conventional motors in terms of magnetic field properties, rotor structure, applicable scenarios, and working principles. However, the advantages of permanent magnet motors, such as fast establishment of permanent magnet magnetic fields, low energy consumption, good high-temperature stability, and low rotor copper consumption, make them advantageous in certain specific application fields.