Servo motors can control speed and position accuracy very accurately, and can convert voltage signals into torque and speed to drive control objects. The rotor speed of a servo motor is controlled by input signals and can react quickly. In automatic control systems, it is used as an actuator and has characteristics such as small electromechanical time constant, high linearity, and starting voltage. It 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. Its main feature is that when the signal voltage is zero, there is no self rotation phenomenon, and the speed decreases uniformly with the increase of torque.
The main advantages of permanent magnet AC servo motors compared to DC servo motors are:
⑴ Without electric brushes and commutators, it works reliably and requires low maintenance and upkeep.
⑵ The heat dissipation of the stator winding is relatively convenient.
⑶ Small inertia, easy to improve the system's speed.
⑷ Suitable for high-speed and high torque working conditions.
⑸ Under the same power, it has a smaller volume and weight.
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