How is current induced in induction motor?

Induction motors use shorted wire loops on a rotating armature and obtain their torque from currents induced in these loops by the changing magnetic field produced in the stator (stationary) coils. The induced voltage in the coil shown drives current and results in a clockwise torque.

How voltage is induced in the rotor of an induction motor?

Operating principle In a three-phase induction machine, alternating current supplied to the stator windings energizes it to create a rotating magnetic flux. The flux generates a magnetic field in the air gap between the stator and the rotor and induces a voltage which produces current through the rotor bars.

How is current induced in the rotor coil?

Eddy currents are induced in the rotor conductors by the rotating magnetic field resulting in a Lorentz force being produced from the interaction of the eddy currents and the rotating magnetic field.

How is emf induced in the rotor of an induction motor?

Currents in the stator windings set up an air gap travelling-wave magnetic field of almost constant magnitude and moving at synchronous speed. The field cuts the rotor conductors at slip speed, inducing a corresponding e.m.f. and causing currents to flow in the short-circuited windings.

What current does induction motor use?

The starting current of the induction motor is about 5 or 6 times the motor full load current. An induction motor of rating 11 KW,22 Amps,440 volts takes a high starting current of about 132 Amps. The current reduces as the motor accelerates towards its base speed or synchronous speed.

What produces induced voltage?

The induced voltage is produced as a product of electromagnetic induction. Electromagnetic induction is the procedure of producing emf (induced voltage) by exposing a conductor into a magnetic field. The induced voltage of a closed-circuit is described as the rate of change of magnetic flux through that closed circuit.

What is the rotor current?

Locked rotor current is basically the current drawn by the motor at its rated voltage when its rotor is kept stationary or in other words rotor is not spinning or rotating. So when we start a motor, its rotor is already at rest. This means, starting current and locked rotor current should be same.

How is the rotor current of a three phase induction motor and slip of the motor related?

This difference in speed depends upon load on the motor. The difference between the synchronous speed Ns of the rotating stator field and the actual rotor speed N is called slip in a three-phase induction motor. When the rotor is stationary (i.e., N = 0), slip, s = 1 or 100 \%.

What is rotor EMF?

Rotor EMF. When the rotor is stationary, the 3-phase induction motor behaves as a 3-phase transformer with secondary winding short circuited. Thus, the per phase induced EMF in the rotor (or secondary) is given by, RotorEMF/Phase,𝐸2=𝐸1×𝑁2𝑁1=𝐾𝐸1…(