Electrical Machines - Induction Motor

A balanced three-phase supply is given to a 30 kW, 4-pole, 400 V, 50 Hz, wound rotor induction motor with Y-connected stator and rotor windings. The motor is driving a constant torque load. With shorted sliprings, the ma...

The operating region of the developed torque ($T_{em}$) and speed ($\omega$) of an induction motor drive is given by the shaded region OQRE in the figure. The load torque ($T_L$) characteristic is also shown. The motor d...

A three phase, 50 Hz, 6 pole induction motor runs at 960 rpm. The stator copper loss, core loss, and the rotational loss of the motor can be neglected. The percentage efficiency of the motor is

A 3-phase star connected slip ring induction motor has the following parameters referred to the stator: R_s = 3 Ω, X_s = 2 Ω, X'_r = 2 Ω, R'_r = 2.5 Ω The per phase stator to rotor effective turns ratio is 3:1. The rotor...

A 10-pole, 50 Hz, 240 V, single phase induction motor runs at 540 RPM while driving rated load. The frequency of induced rotor currents due to backward field is

The parameter of an equivalent circuit of a three-phase induction motor affected by reducing the rms value of the supply voltage at the rated frequency is

A 3-phase, 4-pole, 400 V, 50 Hz squirrel-cage induction motor is operating at a slip of 0.02. The speed of the rotor flux in mechanical rad/sec, sensed by a stationary observer, is closest to

A 375 W, 230 V, 50 Hz, capacitor start single-phase induction motor has the following constants for the main and auxiliary windings (at starting): Zm = (12.50 + j15.75) Ω (main winding), Za = (24.50+ j12.75) Ω (auxiliary...

The equivalent circuit of a single phase induction motor is shown in the figure, where the parameters are R₁ = R₂' = X₁₁ = X₁₂'=12 Ω, X_M=240 Ω and s is the slip. At no-load, the motor speed can be approximated to be the...