induction
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What is The total losses of 3-phase induction motor at 4A armature current and 1.14Ω rotor external resistance. And the practical result ( T=9.5 N.m, N=1196.17 rpm, Pph=600 watt)
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- Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction motor? Explain your answer.A 6-pole, 50 Hz, 3-phase induction motor runs at 960 rpm while delivering a shaft torque of 120 N-m. If friction and windage loss amount to 180 W., determine the rotor copper loss.Design and develop equivalent circuit model of a single phase Induction motor with th consideration of core losses present with the parameter consideration of stator resistance R1 and reactance X1 and two rotor parameters which includes r2,x2 and magnetising reactance xm. (Illustration is required) Draw by hand please
- The rotor resistance and standstill reactance of a 3-phase induction motor are respectively 0.015 ohmsand 0.09 ohms / phase. At normal voltage, the full-load torque at the full-load speed. b.) Calculate thepower factor.IV. What are the various losses in an induction motor? On what actors do they depend?A 3-phase induction motor , the impedance of star connected stator winding is 0.2+j 3 ohm per phase. the no load induced EMF between slip ring is 220 V. Find the rotor current and power factor at rated speed of ? 1455 r.p.m
- Three-phase induction motor, 460 V 50 Hz, 4 poles, 50 hp with Delta, operating at 3.8% slip rated torque when receives Line Voltage 460 V, 50 Hz The parameters of the equivalent circuit per phase are as follows.R1 = 0.33, X1 = X2 = 0.42 and Xm = 30 Ohm / phase.Answer the following questions by neglecting the mechanical losses, Core losses and Stray load losses.A) Value of the rotor resistance R2 B) Maximum torque and rated speed C) line current and starting torque of motorDraw the approximate equivalent (without Xm) circuit of an induction motor and derive the equation of the maximum torque..A 25 HP, 6 pole, 50 Hz, 3-phase slip ring induction motor runs at 960revolutions per minute on full load with a rotor current per phase of 35 A.Allowing 250 W for the copper loss in the short-circuiting gear, and 1000Wfor mechanical losses, find the resistance per phase of the three-phaserotor winding.
- a) In the experiment of performance study of three-phase wound rotor induction motor, what are the effects of adding an external rotor resistance on the following? 1. Motor Slip 2. Motor efficiency 3. Motor starting torque 4. Motor starting current 5. Input power factor 6. Magnetizing current 7. Developed torque 8. Maximum torqueThe air-gap flux density of a two-pole induction motor is given by B=Bm cos(ωt−θ)where Bm is the peak flux density, θ is the angular displacement around the air gap, and we have assumed clockwise rotation. Give the corresponding expression for the flux density of a four-pole induction motor; of a six-pole induction motor.The stator resistance of a 1-phase induction motor is 2.5 ohm and its leakage reactance is 2.0 ohm. Onno-load, the motor takes 4 A at 96 V and at 0.25 lagging power factor. The no-load friction andwindage loss is negligible. Under the blocked-rotor condition, the input power is 130 W at 6 A and42 V. obtain the equivalent circuit parameters.