3P Induction Motors

A \(3\Phi\), 6 pole, 50 Hz induction motor develops 3.73 kW at 960 rpm. What will be the stator input if the stator loss is 280 watts?

A three-phase 4-pole 50 Hz induction motor has a rotor resistance of 0.020 ohm per phase and standstill reactance of 0.5 ohm per phase. Calculate the speed at which the maximum torque is developed.

A 50 Hp, 440 V, 3-phase, 60 Hz,6-pole squirrel cage induction motor is operating at full load and 0.8 p.f. The full load efficiency is 85% and the percentage slip is 5 %. Determine the full load torque.

The rotor resistance of an 8-pole, 50 HZ, wound rotor induction motor is 0.5 Ω per phase The speed of the motor is 720 rpm at full load Determine the external resistance to be connected with the rotor circuit to reduce the speed to 680 rpm for full-load torque. 2 Ω

A 7.5 HP, 500 v three-phase induction motor is developing its full-load output at 960 rpm. The starting torque is equal to the full-load torque. What will be the starting torque if the supply voltage fall to 400 volts?

A 50 HP, 440 v, 3-phase, 60 Hz, 6-pole squirrel cage induction motor is operating at full-load and 0.8 power factor. The full-load efficiency is 85% and the percentage slip is 5%. Determine the full-load torque.

A three-phase, 440 v, 50 Hz, 6-pole induction motor running at 950 rpm takes 50 kW at a certain load. The friction and windage loss is 1.5 kW and stator losses = 1.2 kW. Determine the output from the rotor.

A six-pole, three-phase squirrel-cage induction motor is connected to a 60-cps supply. At full load, the rotor’s induced emf makes 72 complete cycles in 1 minute. Find the rotor speed.

A three-phase induction motor having an input power of 30KW running at a slip of 4%. The stator loss is 1KW and friction and windage loss is 1.5KW. Determine the motor efficiency.

A 3 phase, 60 Hz, 6-pole induction motor delivers 25 HP at 1,150 rpm. If the rotor copper loss is 300 watts, what is the rotor power input?

A three-phase, 4-pole, 50 Hz induction motor supplies a useful torque of 160 N·m at 4% slip. If friction and windage losses are 500 watts, determine the rotor input.

A 6-pole, 50 Hz, three-phase induction motor has a maximum torque of 200 N·m when it is running at a speed of 900 rpm. The resistance of the rotor is 0.25 Ω. Neglecting stator impedance, determine the torque at 5% slip.

A 4-pole, three-phase 50 Hz induction motor develops a maximum torque of 20 N-m at 1,440 rpm. Obtain the torque exerted by the motor at 5% slip.

A three-phase, 4-pole, 60 Hz induction motor has a rotor resistance of 0.02 Ω/phase and a standstill reactance of 0.5 Ω/phase. Calculate the speed at which the maximum torque is developed.

A 3Φ, 6-pole, 50 Hz induction motor develops 3.73 kW at 960 rpm. What will be the stator input if the stator loss is 200 watts?

A three-phase, 6 pole, 50 Hz induction motor develops a maximum torque of 30 N·m at 960 rpm. Calculate the torque produced by the motor at 6% slip. The rotor resistance per phase is 0.6 Ω.

A 440V, 60Hz, 6 pole, 3 phase induction motor has a rotor input power of 33kW at rated voltage and frequency. Under this condition, the rotor emf makes 126 complete cycles/minute. Find the rotor resistance in ohms/phase if the rotor current is 60A/phase.

A 15 hp, 460 V, 60 Hz, 6-pole, 3 phase induction motor has full-load slip of 4%. Find the full-load torque in N-m.