A four pole 60 Hz 460V three phase induction motor operates at 1750 RPM when fully loaded. Determine the synchronous speed, and slip at rated speed. A 100 HP 16 pole 460V three phase 60 Hz induction motor has a slip of 2.4%. What is the synchronous speed, rotor frequency and rotor speed? A 60 Hz four pole 460 V motor has a rotational speed of 1775 RPM. What is the synchronous speed, rotor frequency and rotor speed? A 10 pole 125 HP 575V 60Hz induction motor draws a line current of 125A. The efficiency is 93 %. The core loss is 1053W, the stator conductor loss is 2527W and the rotor conductor loss is 1755w. What is the slip? What is the power factor?
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A 6-pole, 3-phase, 60-Hz induction motor takes 48 kW in power at 1140 rpm. The stator copper loss is 1.4 kW, stator core loss is 1.6 kW, and rotor mechanical losses are 1 kW. Find the motor efficiency. The synchronous speed of an induction motor is 900 rpm. Under a blocked-rotor condition, the input power to the motor is 45 kW at 193.6 A. The stator resistance per phase is 0.2 ̣̉ and the transformation ratio is a = 2. Calculate (a) the ohmic value of the rotor resistance per phase and (b) the motor starting torque. The stator and rotor are wye-connected. Note: a=1/K = (rotor Current/ stator current)
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A 460-V, 25-hp, 60 Hz, four-pole, Y-connected induction motor has the following impedances in ohms per phase referred to the stator circuit: R1 = 0.641 Ω R2 = 0.332 Ω X1 = 1.106 Ω X2 = 0.464 Ω XM = 26.3 Ω 1) The total rotational losses are 1100 W and are assumed to be constant. The core loss is lumped in with the rotational losses. For a rotor slip of 2.2 percent at the rated voltage and rated frequency, find the motor's: 1. Rotation speed of BS 2. Rotation speed of BR 3. Rotor speed. 4. Rotor frequency 5. Stator current 6. Power factor 7. Pconv and Pout 8. tind and tload 9. Efficiency
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