To study of servo motor ~ MONU TUTORIALS ACADEMY

Theory of servo motor

Servo motor are used in feedback control system.servo motor have low rotor inertia and high speed of response. The servo motor also known as control motors.the servo motor which are used feedback control system should have linear relationship between electrical control signal and rotor speed torque speed characteristics should be linear, thus response of servo motor should be fast and inertia should be low.

Types of servo motor

AC servo motor
DC servo motor
Special servo motor

DC servo motor are father classified at armature control DC servo motor and field controlled DC servo motor

AC servo motor

This motor having to part namely stator and rotor AC servo motor at two phase induction motor. The stator has two distributed winding one winding is called main winding for reference winding.the other winding is excited by variable control voltage of the sum frequency as the reference winding but having a phase displacement of 90 degree.

The rotor of AC servo motor are of two types..

Squirrel cage rotor
Drag Cup type rotor

The required cage rotor having large length and small diameter so its resistance is very high the air gap of squirrel cage is kept small. In in drag Cup type these are two year gaps.for the rotor cup of non-magnetic conducting material is used.

the resistance of drag Cup type is high and therefore having high starting torque. Generally Aluminium is used for cup. In the figure show the schematic diagram of 2 2 phase AC servo motor and in other figure show the two types of rotor.

Torque speed characteristics

the torque speed characteristics of 3 phase induction motor depend upon the ratio of reactions to resistance for high resistance and low reactance the characteristics is linear and for large ratio of X10R it becomes non linear.the torque speed characteristics for various control voltage are almost linear.

DC servo motor

DC servo motor are separately excited or permanent magnet DC servo motor.the armature of DC servo motor has a large resistance therefore torque speed characteristics is linear.the torque speed characteristics is linear the torque speed systematic diagram of separately excited DC servo motor.

Application of servo motor

Servo motor are widely used in rotor, electromechanical accessories, computers, machine tools, tracking and guidance system, process controller and routers.

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