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Option 3 : Variable voltage and variable frequency scheme
Speed control methods of 3 phase induction motor are given by
From the stator side:
- v/f control or frequency control
- changing the number of stator poles
- controlling supply voltage
- adding rheostat in the stator circuit
From the rotor side:
- adding external resistance on the rotor side
- cascade control method
- Injecting slip frequency emf into the rotor side
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