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 transmission device. The servo motor can make the control speed, azimuth accuracy is very precise, and can convert the voltage signal into torque and speed to drive the control target. 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, starting voltage, etc., which can convert the received electrical signal into angular displacement or angular velocity output on the motor shaft. It is divided into two categories: DC and AC servo motors, and its main feature is that when the signal voltage is zero, there is no rotation phenomenon, and the speed decreases uniformly with the addition of torque
Servo motors are widely used in various control systems, which can convert the input voltage signal into the mechanical output on the motor shaft, and drag the controlled elements to achieve the control intention.
Servo motors are divided into DC and AC; * The early servo motor is a general DC motor, and the general DC motor is selected as a servo motor in the case of low control accuracy. At present, the DC servo motor is a low-power DC motor from the structural point of view, and its excitation is mostly controlled by armature and magnetic field, but armature control is generally selected.
For the classification of rotating electrical machines, DC servo motors can well meet the requirements of the control system in terms of mechanical characteristics, but because of the existence of commutators, there are many deficiencies: sparks are easy to occur between the commutator and the brushes, which interfere with the work of the driver and cannot be used in the occasion of combustible gas; There is friction between the brushes and the commutator, and a large dead zone will occur;
The structure is complex and maintenance is difficult.
The AC servo motor is essentially a two-phase asynchronous motor, and there are three main control methods: amplitude control, phase control and amplitude phase control.
Generally, servo motors require that the speed of the motor be controlled by the applied voltage signal; The rotational speed can change successively with the change of the applied voltage signal; The response of the motor should be fast, the volume should be small, and the control power should be small. Servo motors are mainly used in various motion control systems, especially follow-up systems.
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