Q2B: Draw and explain the Torque-Slip characteristics of the 3-phase induction motor ?
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- Name three factors that determine the torque produced by an induction motor.A three phase, 50Hz, 6-pole squirrel cage induction motor runs at 960-rpm on full load. The stand still rotor resistance and reactance per phase are 0.01 ohm and 0.05 ohm respectively. Express the maximum torque developed in terms of full load toque. Find the slip at which the maximum torque occurs.Type your question here Calculate the torque developed per phase for a 6-pole, 60 Hz, 3-phase induction motor at a slip of 5%, if the motor develops a maximum torque per phase is 250 N.m while running at 870 r.p.m.
- A three phase, 4 pole, 3300 V, 50 Hz, star connected Induction motor, has identical primary and referred secondary impedance of value 3+j9 Ohm per phase. Using the approximate circuit, calculate: A. The full load torque at rated slip of 5%. B. The maximum torque at normal voltage and frequency.2-Could you give examples where fast breaking of induction motor is required?3. The slip-ring rotor resistance and standstill reactance per phase of a 3300 V, 24-pole, 50 Hz, 3-phase star-connected induction motor are 0.02 ohm and 0.3 ohm respectively. Calculate the (a) speed at maximum torque (b) ratio of full load torque to maximum torque if the full load speed is 246 rpm
- 21. A) At what percentage of slip is the pull-out or breakdown torque of a typical 3-phase squirrel-cage induction motor reached? a) 3% slip b) 10% slip c) 20% slip d) none of the above B) If load is increased beyond the breakdown torque, what happens to the speed of the motor? a) it stops b) it may speed up beyond its rated rpm c) its speed will not change, but its current will go downd) none of the aboveQ3 // Answer for the following question: 1-The rotor of a 4 pole, 50 Hz, slip ring induction motor has a resistance of 0.25 ohm per phase and runs at 1440 rpm at full-load.Calculate the external resistance per phase, which must be added to lower the speed to 1200 rpm, torque remaining the same? 2- Calculate the torque developed per phase for a 6-pole, 60 Hz, 3-phase induction motor at a slip of 5%, if the motor develops a maximum torque per phase is 250 N.m while running at 870 r.p.m. ( This question is about electrical machines, and I need to answer in 30 minutes please )A 4-pole, 3-phase, 50Hz induction motor has a voltage between slip-rings on open circuit of 520V. The star connected rotor has a standstill reactance and resistance of 2.0 and 0.4 Ω per phase respectively. Determine: (a) The full-load torque if full load speed is 1,425 rpm(b) The ratio of starting torque to full-load torque(c) The additional rotor resistance required to give maximum torque at standstill.
- 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 motorA three-phase induction motor, operating at rated voltage and frequency, has a startingtorque of 1.35 times and a maximum torque of 2.2 times, both with respect to its rated-loadtorque. Ignoring the effects of the stator resistance and rotational losses and assumingconstant rotor resistance, determine the slip at the maximum torque;A 75kW, 440V, 3-phase, 6-pole,50Hz wound rotor induction motor has a full load slip of0.04 and the slip at maximum torque of 0.2 when operating at rated voltage and frequencywith rotor winding short circuited at the slip rings. Assume the stator resistance androtational losses to be negligible. Find(a) Maximum torque(b) Starting torque(c) Full load copper loss.The rotor resistance is now doubled by adding an external series resistance.Determine(d) Slip at full load(e) full-load torque(f) slip at maximum torque