1. The working principle of servo motor: The rotor inside the servo motor is a permanent magnet, and the U/V/W three-phase electricity controlled by the driver forms an electromagnetic field. The rotor rotates under the action of this magnetic field. At the same time, the encoder built-in to the motor feeds back a signal to the driver, and the driver compares the feedback value with the target value to adjust the angle of rotation of the rotor. The accuracy of servo motors depends on the accuracy (number of lines) of the encoder.

2. Specific work process.

When a servo motor receives one pulse, it will rotate by the angle corresponding to one pulse, thereby achieving displacement. Because the servo motor itself has the function of emitting pulses, it will emit a corresponding number of pulses every time it rotates by one angle.

In this way, a response or closed loop is formed with the pulses received by the servo motor. In this way, the system will know how many pulses were sent to the servo motor and how many pulses were received back.

It can precisely control the rotation of the motor to achieve precise positioning, up to 0.001mm. DC servo motors are divided into brushed and brushless motors.

Brushed motors have low cost, simple structure, large starting torque, wide speed range, easy control, and require maintenance. However, maintenance is inconvenient and generates electromagnetic interference, which has environmental requirements. Therefore, it can be used in cost sensitive general industrial and civilian applications.

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