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STARTING OF 3PH INDUCTION MOTOR
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DOL STARTER
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STAR DELTA STARTER
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AUTO TRANSFORMER STARTER
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ROTOR RESISTANCE STARTER
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SPEED CONTROL OF ROTOR SIDE
• The Speed of Induction Motor is changed from Both Stator and Rotor Side
The speed control of three phase induction motor from stator side are further classified as :
V / f control or frequency control.
• Changing the number of stator poles.
• Controlling supply voltage.
• Adding rheostat in the stator circuit.
The speed controls of three phase induction motor from rotor side are further classified as:
• Adding external resistance on rotor side.
• Cascade control method.
• Injecting slip frequency emf into rotor side.
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CHANGE OF SUPPLY VOLTAGE
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ROTOR RESISTANCE CONTROL
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V/F CONTROL
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INJECTION OF EMF IN TO THE ROTOR
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CASCADED CONNECTION
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CRAWLING
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COGGING OR MAGNETIC LOCKING
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How Induction Motor works as Generators?• If the rotor is made to rotate at a speed more than the synchronous speed, the slip becomes negative.
A rotor current is generated in the opposite direction, due to the rotor conductors cutting stator magnetic field.
• This generated rotor current produces a rotating magnetic field in the rotor which pushes (forces in opposite way) onto the stator field. This causes a stator voltage which pushes current flowing out of the stator winding against the applied voltage. Thus, the machine is now working as an induction generator (asynchronous generator).