3. A 6 pole induction motor has the ratings: U₁ = 400 V, n = 970 rpm, ƒ№ = 50 Hz, the stator windings are connected as Y, if the parameters are: r₁ = 2.08 №, r₂ = 1.53 N, x₁ = 3.12 №, x₂ = 4.25 N. Find out: (a) rated slip; (b) maximum torque; (c) overload ability Am (d) the slip when the maximum torque occurs.

3. A 6 pole induction motor has the ratings: U₁ = 400 V, n = 970 rpm, ƒ№ = 50 Hz, the stator windings are connected as Y, if the parameters are: r₁ = 2.08 №, r₂ = 1.53 N, x₁ = 3.12 №, x₂ = 4.25 N. Find out: (a) rated slip; (b) maximum torque; (c) overload ability Am (d) the slip when the maximum torque occurs.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter35: Harmonics 916

Section: Chapter Questions

Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...

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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) The figure below shows the per-phase equivalent circuit of a two- pole three-phase induction motor operating at 50 Hz. The voltage (E1) across the magnetizing inductance is 210 V, and the slip (s) is 0.05. What is the developed torque produced by the motor ? 0.04 0 j0.22 0 j0.22 0 0.05 V j6.28 NE E1
a) The figure below shows the per-phase equivalent circuit of a two- pole three-phase induction motor operating at 50 Hz. The voltage (E1) across the magnetizing inductance is 210 V, and the slip (s) is 0.05. What is the developed torque produced by the motor ? 0.04 N j0.22 N j0.22 Q 0.05 0 V j6.28 NE E1
a) The figure below shows the per-phase equivalent circuit of a two- pole three-phase induction motor operating at 50 Hz. The voltage (E1) across the magnetizing inductance is 210 V, and the slip (s) is 0.05. What is the developed torque produced by the motor ? 0.04 O j0.22 Q jo.22 0 j6.28 N E E1 0.05 0 V b) A 4 poles , 50HZ ,Y-connected three phase induction motor has the per phase equivalent circuit parameters of ( R3= R2= 0.12 , X1 = X2 = 0.6 , Xm =12 ) N and l2 = 20L0". Use exact equivalent circuit to determine the following at rated slip of 0.03 : I. Stator current II. Magnetizing current II. Power factor IV. Developed torque c) What is the physical meaning for each of the following induction motor parameters: R1 ,R2 ,Rc ,X1 ,X2 ,Xm ?
a)the figure below shows the per-phase equivalent circuit of a two - pole three- phase induction motor operating at 50 Hz . The voltage (E1) across the magnetizing inductance is 210 v , and the slip (s) is 0.05 . What is the developed torque produced by the motor ? b) A 4 poles , 50Hz , Y-connected three phase induction motor has the per phase equivalent circuit parameters of (R1 =R2=0.12 , X1=X2=0.6 , Xm =12 ) ohm and I2 =20 (0 . Use exact equivalent circuit to determine the following at rated slip of 0.03 : I. Stator current II. Magnetizing current III. Power factor IV. Developed torque C) What is the physical meaning for each of the following induction motor parameters : R1 , R2 , Rc , X1 , X2 , Xm d) What is synchronous watt
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A three-phase induction motor has: n-1500 rpm, nm-1440 rpm, the input power of the motor is Pin = 37.5 kW, if the no-load losses (i.e. stator core losses Pscl & core losses Pa) are equal 1.5 kW. Then the rotor core losses is: 1.44 [kW] 1.50 [kW] 3.56 [kW] 4.56 [kW]
A three-phase, four-pole, 208 V, 60 Hz, Y-connected, induction motor has the following parameters, in Q/phase referred to the stator: R1 = 0.22, X1 = 0.43, Xm = 15, Rc = 0, R2 = 0.127 and X2 = 0.43. Assume that PFgw = 300 W. For a rated slip of 5%: a) Determine the rms value of the input current of the machine. b) Find the power converted from electrical to mechanical. c) Compute the shaft speed at half-rated load.
3.An induction motor has a rotor resistance and reactance at standstill of 0.1 ohm and 3.5 ohm respectively. At standstill the voltage induced to the rotor is 60volts per phase. If the slip is 5%, determine the rotor current
An 3-phase induction motor(IM) has full load slip = 0.5%. If the rotor circuit resistance is increased so that R2new =2R2old, then the slip at which the motor develops the same full load torque is=.. * ......
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1.5 A 10‐pole, 380 ‐V, 50 Hz, D‐connected three‐phase induction motor is rotating a quarry belt conveyor. The machine has the following parameters, referred to the stator, on a per phase basis: Stator Parameters Winding Resistance................0.19 Ω ......... Winding Reactance.................1.12 Ω.......... Rotor Parameters Winding Resistance......................0.29 Ω Winding Reactance.....................1.12 Ω Magnetising Reactance................................16.8 Ω Equivalent Core‐loss Resistance....................900 Ω. The friction and windage losses are 320 W. When the motor runs at its rated slip of 2.6 %. Determine: 1.5.1 The stator current. 1.5.2 Estimate the Output torque of the motor under the rated conditions. 1.5.3 The Motor…