How is torque produced in a 3 phase motor?

The rotor windings in an induction motor are either closed through an external resistance or directly shorted. Therefore, the e.m.f induced in the rotor causes current to flow in a direction opposite to that of the revolving magnetic field in the stator and leads to a twisting motion or torque in the rotor.

How is torque produced in a squirrel cage motor?

When an alternating current is run through the stator windings, a rotating magnetic field is produced. This induces a current in the rotor winding, which produces its own magnetic field. The interaction of the magnetic fields produced by the stator and rotor windings produces a torque on the squirrel cage rotor.

What is torque in 3 phase induction?

Torque of a three phase induction motor is proportional to flux per stator pole, rotor current and the power factor of the rotor. T ∝ ɸ I2 cosɸ2 OR T = k ɸ I2 cosɸ2 .

When 3-phase stator winding is energized from a 3-phase supply a rotating magnetic field is set up which rotates round the stator at?

When a 3-phase winding is energized from a 3-phase supply, a rotating magnetic field is produced. This field is such that its poles do no remain in a fixed position on the stator but go on shifting their positions around the stator. For this reason, it is called a rotating field.

Why there is no rotating magnetic field in transformer?

In a transformer, it’s mostly design. There are no windings that are out of phase with each other, and therefore, no torque produced, and thus no rotation.

How is motor torque generated?

In magnetic motors, magnetic fields are formed in both the rotor and the stator. The product between these two fields gives rise to a force, and thus a torque on the motor shaft. One, or both, of these fields must change with the rotation of the rotor.

What is the relation between torque and voltage in 3-phase induction motor?

Effect of Change of Supply Voltage on Starting Torque of 3-Phase Induction Motor. Hence, the starting torque is directly proportional to the square of the supply voltage. Therefore, the starting torque is very sensitive to changes in the value of the supply voltage.

How is torque generated in induction motor?

Induction Motors An induction motor develops torque by inducing current to the rotor, which is proportional to the differential speed of the rotor and the rotating magnetic field in the stator.

How is torque produced?

Torque is a force that tends to rotate or turn things. You generate a torque any time you apply a force using a wrench. Notice that the torque units contain a distance and a force. To calculate the torque, you just multiply the force by the distance from the center.