Vector
Control of
Induction motor :
•The
vector control method allows squirrel cage induction motor driven with high dynamic performance.
•Vector
control offers more
precise control, speed control over wide range and operation above base speed.
•From field angle vector control is divided into two
types.
•There
are two types in vector control one is direct and second is indirect control.
•In direct control method air gap flux should be known via air gap flux
sensor.
•And indirect control method rotor speed should be known via Hall sensor.
•The direct method is a modern technique and
torque response time is 10 times faster.
•The indirect method is rotor flux oriented vector
control.
•The direct method is air gap flux with sensor vector
control.
•Dynamic model of motor is need for vector control.
•Vector
control uses a feedback
system.
•Vector
control allows speed control in all four quadrants.
Vector control follow a
algorithm:
•First find field angle.
•Second calculate flux component.
•Third calculate torque component.
•Fourth calculate stator-current phasor
magnitude.
•Fifth calculate torque angle.
•Sixth calculate stator-current phasor angle.
•Seventh synthesize current using
inverter.
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