The motor is the power device that drives the vehicle.There are many types of motors, which are mainly divided into permanent magnet synchronous motor, asynchronous motor and electromagnetic induction motor according to the working principle. Let’s briefly introduce these three motors.
- Permanent magnet synchronous motor
Permanent magnet synchronous motor (PMSM) is a slotless asynchronous motor. It uses permanent magnet material as rotor, so it has simple structure, durability and high operating efficiency. Its structure is similar to that of ordinary asynchronous ebike motors, which is mainly composed of stator and rotor.
The main reason is that the asynchronous motor has large power and high speed, which is easy to overload at low speed, and needs to consume a lot of electric energy to maintain the working state; At high speed, the speed decreases and the torque decreases rapidly, which requires a large amount of electric energy to maintain the working state. Therefore, asynchronous motors are not suitable for low-speed or high-speed machinery.
Electromagnetic induction dual scooter motor is the most efficient of the three kinds of scooter motors. It is also called induction motor because it uses the law of electromagnetic induction to generate rotating magnetic field in the electromagnetic field. It has the advantages of compact structure, convenient manufacturing, low price, high power density, high efficiency, and can directly control the rotation speed, which has great application potential. However, this kind of ebike motor has a disadvantage. Because of its structural characteristics, its rotor winding must be connected with the stator winding in series to work normally.