A pure electric vehicle motor is a speed-regulated drive system composed of an AC motor and its matching controller. The AC motor refers to the AC asynchronous traction motor, which is driven by the rotating magnetic field to rotate the rotor. The structure is simple, the reliability is strong, the driving circuit is also simple and reliable, and the efficiency is high. Compared with rare earth permanent magnet motors, permanent magnet motors are expensive, and some of the comprehensive prices are twice that of AC asynchronous motors. Especially once electric vehicles become popular and rare earth resources are in short supply, the price will skyrocket, making electric vehicles very uneconomical and affecting the development of electric vehicles. Popularization: There are also complex driving circuits, poor reliability, and difficult heat dissipation, which makes the actual efficiency inferior to AC asynchronous motors; rare earth permanent magnet motors are usually water-cooled, which makes the power structure complex and the cost increases. In contrast, the advantages of AC motors are very obvious.