The electric motor can convert electric energy into mechanical energy, and through the transmission system to the mechanical class to the wheels to drive the car driving, is the new energy vehicle one of the core drive system. 

At present, the drive motors commonly used in new energy vehicles are mainly permanent magnet synchronous motors and AC asynchronous motors, and most of the new energy vehicles use permanent magnet synchronous motors.

Permanent magnet synchronous motors have a high power-to-mass ratio, smaller size, lighter mass, higher output torque, and better motor limiting speed and braking performance, so permanent magnet synchronous motors have become the most widely used motors for today's electric vehicles.

Compared with permanent magnet synchronous motors, asynchronous motors need to absorb electrical energy for excitation when working, which will lose electrical energy and make the efficiency of the motor lower, while permanent magnet motors have a higher cost due to the addition of permanent magnets.

Models choosing AC asynchronous motors will tend to prioritize performance, taking advantage of the AC asynchronous motor's performance output and efficiency at high rpm.

Models choosing permanent magnet synchronous motors will tend to prioritize energy consumption, taking advantage of the performance output and high efficiency of permanent magnet synchronous motors at low-speed stages, and are suitable for small and medium-sized vehicles. 

Characterized by its small size and light weight, it can increase range. At the same time it has good speed regulation performance and can maintain high efficiency in the face of repeated starting and stopping, acceleration and deceleration.

In the cost of permanent magnet synchronous motor, the cost of permanent magnet material is about 30%. The raw materials for manufacturing permanent magnet synchronous motors mainly include NdFeB, silicon steel sheet, copper and aluminum, etc., among which the permanent magnet material NdFeB is mainly used for manufacturing rotor permanent magnets, with a cost composition of about 30%; silicon steel sheet is mainly used for making stator and rotor cores, with a cost composition of about 20%; stator windings, with a cost composition of about 15%; motor shafts, with a cost composition of about 5%; and motor shells, with a cost composition of about 15%.

In short, the efficiency and power factor of permanent magnet motors can be very high, the structure is very simple, the market has been very hot in recent years.