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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 I 2 cosɸ 2 OR T = k ɸ I 2 cosɸ 2. where, ɸ = flux per stator …

In this article, we will derive the torque equation of three phase induction motor. The torque is the turning ability of an induction motor. When the stator of the three-phase induction motor …

The torque produced in the induction motor depends on the following factors : 1. The part of rotating magnetic field which reacts with rotor and is responsible to produce induced e.m.f. in …

A 100 kW, 3 kV, 50 Hz, 8-pole, star connected induction motor has a star connected slip ring rotor with a turn ratio of 2.5 (stator/rotor). The rotor resistance is 0.2 Ω/phase and its per phase …

Three-phase Induction Motor Full-Load Torque. For a 3-phase induction motor, the full-load torque is given by, $$\mathrm{\tau_{F.L} \:\propto\: \frac{sR_2}{R_{2}^{2}} \: + \: (sX_{2})^{2} …

In three phase induction motor torque is produced by the interaction of magnetic field produced by stator winding and magnetic field produced by rotor winding. These two magnetic fields are …

To induce current in rotor there must be a speed difference between the rotor and the rotating magnetic field. This speed difference is called slip speed. 50 Starting torque is developed …

The torque developed by three phase induction motors varies with the speed of the motor when it accelerates from full stop or zero speed, to maximum operating speed.

NEMA classifies three-phase squirrel cage induction motors in four different design codes (A, B, C and D) according to locked rotor torque and current, breakdown torque, pull up torque, and …

The torque-speed characteristics of a 3-phase induction motor is defined as the curve plotted between torque developed and rotational speed of the motor. It gives the information about …

May 6, 2020 · The three phase supply current produces an electromagnetic field in the stator winding which leads to generate the torque in the rotor winding of three phase induction motor …

Nov 1, 2018 · As a motor, the machine has a starting torque (at zero speed); thus, the machine is a self-starter. In the linear (operating) region as a motor, as torque increases, the speed …

The induction motor operates for the values of slip between s = 0 and s = s m, where sm is the value of slip corresponding to maximum torque. For a typical 3-phase induction motor, the …

The curve obtained by plotting torque against slip from s = 1 (at start) to s = 0 (at synchronous speed) is called torque-slip characteristics of the induction motor. It is very interesting to study …

Example 1 : A 400 V, 4 pole, 3 phase, 50 Hz star connected induction motor has a rotor resistance and reactance per phase equal to 0.01 Ω and 0.1 Ω respectively. Determine i) …

A 6-pole, 50 Hz, 3-phase induction motor has a rotor resistance of 0.03 Ω per phase and standstill reactance of 0.5 Ω per phase. Determine the slip corresponding to maximum torque and …

Jan 15, 2025 · Solution For A 3 phase induction motor is driving full load torque which is independent of speed if the line voltage drops to 90% of rated value percentage increase in …