**Contents**show

## 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**. … I_{2} = rotor current at standstill, ɸ_{2} = 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.

## 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.