Automotive servo motors usually consist of the following main components:

1. Motor: It is the core component of the servo motor and is responsible for rotating the actuator. The motor usually adopts DC motor or AC motor, which has the characteristics of high efficiency and high torque output.

2. Sensor: It is used to monitor the position and speed of the motor to achieve accurate control. Sensors can be encoders, Hall sensors, etc., which can feed back the state information of the motor in real time.

3. Control circuit: The control circuit receives the signal from the electronic control unit (ECU) and adjusts the rotation direction, speed and position of the motor according to the signal. Control circuits usually include power amplifiers, drivers and other components.

4. Reducer: used to slow down the speed of the motor, improve the torque output and achieve more accurate control. The reducer usually adopts gear transmission or belt transmission.

5. Shell and bracket: used to fix and protect the internal components of the servo motor to ensure its normal operation and safety in harsh environment.

To sum up, the main components of automobile servo motor include motor, sensor, control circuit, reducer, shell and bracket. These components work together to achieve accurate control of the position and speed of the actuator and provide efficient and reliable power output for the automobile system.