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How does the servo motor work?

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Servo motor is an engine that operates a mechanical component in a servo system and is an auxiliary motor indirect transmission. 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 servo motor rotor speed is controlled by the input signal and can react quickly. It is used as an actuator in the automatic control system, and has the characteristics of small electromechanical time constant, high linearity, and starting voltage, which can receive the received electrical signal. Converted to an angular displacement or angular velocity output on the motor shaft. Divided into two major categories of DC and AC servo motor, its main feature is that when the signal voltage is zero, there is no rotation phenomenon, and the rotation speed decreases uniformly with the addition of torque. Servo motors are divided into brushed and brushless motors. The brush motor has low cost, simple structure, large starting torque, wide speed regulation, easy control and demand protection, but convenient protection (replacement of carbon brushes), electromagnetic interference, and environmental requirements. It can therefore be used in general industrial and civilian applications that are sensitive to cost. The brushless motor is small in size, light in weight, large in output, fast in response, high in speed, small in inertia, smooth in rolling, and stable in torque. The control is complex, easy to achieve intelligence, its electronic commutation mode is flexible, and it can be square wave commutation or sine wave commutation. The motor is protection-free, has high power, low operating temperature, low electromagnetic radiation and long life, and can be used in various environments. 2. AC servo motor is also a brushless motor, which is divided into synchronous and asynchronous motors. At present, synchronous motors are generally used in motion control. It has a large power range and can achieve a large power. High inertia, low rotational speed, and rapid decrease as power increases. Therefore, it is suitable for applications with low speed and smooth operation. 3. The rotor inside the servo motor is a permanent magnet. The U/V/W three-phase electric motor controlled by the driver forms an electromagnetic field. The rotor rotates under the action of the magnetic field. At the same time, the encoder feedback signal from the motor is supplied to the driver. The driver according to the feedback value. Compare with the target value to adjust the angle at which the rotor rotates.