Servo Motor Principle
Servo Motor
Automatic control device used for the implementation of components of micro-motor. Also known as the implementation of the motor. Its function is to convert electrical signals shaft angular displacement or angular velocity.
Servo Motor sub-AC and DC types. AC Servo Motor works the same as with the AC induction motor. In the stator there are two phase-space displacement of 90 ° electrical angle and control the field winding Wf take a constant exchange of winding WcoWf voltage applied to the Wc on the use of AC voltage or phase changes, to control motor operation purposes. AC Servo Motor has a stable operation and good controllability, fast response, high sensitivity, as well as mechanical properties and regulation characteristics of the non-linearity indicator strict (requiring less than 10%, respectively 15% and less than 15% ~ 25%), etc. characteristics. DC Servo Motor works the same as with the general DC motor. Motor speed n for
n = E/K1j = (Ua-IaRa) / K1j where E is the armature back-EMF; K is a constant; j for each pole flux; Ua, Ia is the armature voltage and armature current; Ra is armature resistance . Change Ua or change φ, can control the DC Servo Motor speed, but generally used method of controlling the armature voltage. In the Permanent Magnet DC Servo Motor, the excitation windings are replaced by a permanent magnet, the magnetic flux φ constant.
DC Servo Motor has a good linear regulator features and fast time response.
Keywords: Servo Motor