Three Phase Motor

An induction Three Phase Motor electric motor or 3 phase induction motor is an AC electric electric motor in which the Three Phase Motor ER series helical geared motorelectric current in the rotor had a need to create torque is obtained by electromagnetic induction from the magnetic field of the stator winding

An induction engine which connects with a 3-stage supply called 3-phase induction motor. Example enthusiasts,blowers, cranes,traction .It really is a ac electric motor. The primary drawback of is the existence of commutator and brushes, which require frequent maintenance and we can't use DC electric motor in explosive and dirty environment. But induction motors are cheaper,durable,lighter,smaller,require much less maintenance and can use in filthy and explosive environment. Slip s may be the imp element in this type of motor.

There are 2 types of IM.

Squirrel cage IM

Slip ring IM

There are various starting and braking condition.

Important starting methods are

Star-delta starter

Auto transformer starter

Ac voltage controller starter

Rotor resistance starter

Important braking methods are

Regenerative braking

Plugging or invert voltage braking

Dynamic braking

But one thing speed control technique of induction motor is important

Pole changing

Stator voltage control

V/f control

Slip power recovery

Rotor resistance control

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