The form is different depending on the environment in which it is used and the frequency of use. Different types of motors have different characteristics. At present, permanent magnet DC motors are commonly used in electric vehicle motors. Electric motor motor is divided into two categories according to the power supply form of the motor. It can be divided into two types: brush motor and brushless motor. According to the mechanical structure of the motor assembly, it is generally divided into "toothed" (high motor speed, need to pass gear Deceleration) and "no teeth" (motor torque output does not undergo any deceleration) two categories.