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With the widespread application of rare earth permanent magnet materials in the field of motors, the design and application of rare earth permanent magnet synchronous motors have become mature, and the industry has also mastered the characteristics of rare earth permanent magnet synchronous motors:

1. High efficiency, no rotor loss;

2. No slip, good control accuracy, closed-loop control can achieve servo characteristics;

3. The torque fluctuation is small, and the rated torque output can be achieved at low frequencies;

4. High power factor, no need for excitation current;

5. High power density, the same power can reduce the size of the motor;

According to the electromagnetic induction characteristics, more pole pairs mean that more excitation current is needed to establish the excitation magnetic field, which is also the main reason why three-phase asynchronous motors cannot be made with more pole pairs.

Due to the characteristic of rare earth permanent magnet synchronous motors that do not require excitation current, they have broken through the limitations of motor development in low-speed fields and can achieve low speed and high torque under the same power conditions. The motor can be made into 16 pole, 32 pole, 48 pole... Based on the characteristic of rare earth permanent magnet synchronous motor, the motor can fully meet the low-speed and high torque requirements of the transmission system. By integrating the motor with the reducer, the reducer can be eliminated.