How is torque produced in a 3 phase induction motor?

How torque is produced in a 3 phase motor?

Torque of a three phase induction motor is proportional to flux per stator pole, rotor current and the power factor of the rotor. … I2 = rotor current at standstill, ɸ2 = angle between rotor emf and rotor current, k = a constant.

How is torque produced 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. … Due to the torque variation at each revolution the instantaneous speed will vary.

Which is directly proportional to torque in 3 phase induction motor?

Torque is directly proportional to the square of the supply voltage. s X 2 2 ≪ R 2 2 i.e. the effective rotor circuit resistance is very large compared to the rotor reactance. … Thus, torque-slip characteristics are linear in the lower slip region.

How do you calculate starting torque?

To calculate load torque, multiply the force (F) by the distance away from the rotational axis, which is the radius of the pulley (r). If the mass of the load (blue box) is 20 Newtons, and the radius of the pulley is 5 cm away, then the required torque for the application is 20 N x 0.05 m = 1 Nm.

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Which induction motor has maximum speed?

Synchronous and full load speed of amplitude current (AC) induction motors

Speed (rpm)
Number of Poles Frequency (Hz, cycles/sec)
Synchronous Full Load
2 3600 2900
4 1800 1450

Is 3 phase induction motor is self starting?

Three-phase induction motor is self-starting, because winding displacement is 120 degrees for each phase and supply also has 120 phase shift for 3-phase. It results in a unidirectional rotating magnetic field is developed in air gap which causes 3-phase induction motor to self-start.

What is the relation between current and torque?

Mechanical or load torque is proportional to the product of force and distance. Motor current varies in relation to the amount of load torque applied. When a motor is running in steady state, the armature current is constant, and the electrical torque is equal and opposite of the mechanical torque.