Are the hub motors used in general electric vehicles servo motors?

1. The hub motors used in general electric vehicles are not servo motors, but permanent magnet DC motors. The so-called permanent magnet motor means that the motor coil is excited by permanent magnets instead of coil excitation. In this way, the power consumption of the excitation coil is saved, and the electromechanical conversion efficiency of the motor is improved. This can reduce the driving current and extend the mileage of the electric vehicle that uses the limited energy on the vehicle. Electric vehicle motors can be divided into brush motors and brushless motors according to the energization form of the motors; according to the mechanical structure of the motor assembly, they are generally divided into "toothed" (the motor has a high speed and needs to go through the gear deceleration) and "no gear" (motor torque output without any deceleration) two categories.
2. Servo motor refers to the engine that controls the operation of mechanical components in the servo system, and is a kind of auxiliary motor indirect speed change device. The servo motor can control the speed and position accuracy very accurately, and can convert the voltage signal into torque and speed to drive the control object. The rotor speed of the servo motor is controlled by the input signal and can respond quickly. In the automatic control system, it is used as an actuator, and has the characteristics of small electromechanical time constant, high linearity, and starting voltage. It can convert the received electrical signal Converted to angular displacement or angular velocity output on the motor shaft. It is divided into two categories: DC and AC servo motors. Its main feature is that there is no self-rotation phenomenon when the signal voltage is zero, and the speed decreases at a uniform speed with the increase of torque.