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The material of automobile servo motor usually depends on the functions and requirements of its different components, mainly including the following materials:

1. Motor part: The main part of the motor is usually made of aluminum alloy, copper, steel and other metal materials to ensure that the motor has sufficient strength and durability. The coil of the motor is usually made of copper wire or aluminum wire.

2. Sensor part: The shell of the sensor is usually made of high-temperature and corrosion-resistant plastic materials, such as polyamide and polyester. The sensing element inside the sensor may be made of silicon, ferrite and other materials.

3. Control circuit: The substrate of the control circuit is usually made of glass fiber reinforced epoxy resin (PCB) to ensure the stability and reliability of the circuit. Circuit elements may be made of metal, semiconductor, etc.

4. Reducer: The gear of the reducer is usually made of alloy steel or cemented carbide to improve the wear resistance and bearing capacity. The shell of reducer is usually made of aluminum alloy or steel.

5. Shell and bracket: The shell and bracket are usually made of light materials such as aluminum alloy, magnesium alloy and plastic to ensure the lightweight and durability of the overall structure of the servo motor.

To sum up, the materials of automotive servo motors mainly include aluminum alloy, copper, steel, plastic, glass fiber reinforced epoxy resin (PCB), alloy steel, cemented carbide and so on. These materials play their own characteristics in different parts, and together form a high-performance and reliable automobile servo motor.