8MSA3L.E0-31 B&R Servo motor

Classification of servo motors
Servo motor is divided into AC servo and DC servo two categories.

The basic structure of AC servo motor is similar to that of AC induction motor (asynchronous motor). The excitation winding Wf and the control winding WcoWf, which have two phase space displacement angles of 90° on the stator, are connected with constant AC voltage, and the AC voltage or phase change applied to the Wc is used to control the operation of the motor. Ac servo motor has the characteristics of stable operation, good controllability, fast response, high sensitivity, and strict nonlinearity index of mechanical characteristics and adjustment characteristics (requirements are less than 10% ~ 15% and less than 15% ~ 25%, respectively).

Advantages and disadvantages of DC servo motor
Advantages: precise speed control, torque speed characteristics are very hard, simple control principle, easy to use, cheap.
Disadvantages: brush commutation, speed limit, additional resistance, wear particles (not suitable for dust-free explosive environment).
The basic structure of DC servo motor is similar to that of general DC motor. Motor speed n=E/K1j=(UA-IARA)/K1j, where E is the armature back electromotive force, K is a constant, j is the magnetic flux per pole, Ua, Ia are the armature voltage and armature current, Ra is the armature resistance, change Ua or change φ, can control the DC servo motor speed, but generally use the method of controlling the armature voltage, In a permanent magnet DC servomotor, the field winding is replaced by a permanent magnet with a constant flux φ. Dc servo motor has good linear adjustment characteristics and fast time response.
Advantages and disadvantages of AC servo motor
Advantages: Good speed control characteristics, smooth control can be achieved in the entire speed zone, almost no oscillation, more than 90% high efficiency, less heat, high speed control, high precision position control (depending on the accuracy of the encoder), rated operation area, can achieve constant torque, low inertia, low noise, no brush wear, maintenance-free (suitable for dust-free, explosive environment).
Disadvantages: The control is more complex, the driver parameters need to be adjusted on site to determine the PID parameters, and more connections are required.

8MSA3L.R0-30