A 1-0, induction motor has stator windings in space quadrature and is supplied with a single-phasevoltage of 200 V at 50 Hz. The standstill impedance of the main winding is (5.2 +j 10.1) and of theauxiliary winding is (19.7 + j 14.2). Find the value of capitance to be inserted in the auxiliarywinding for maximum starting torque.(Electrical Machines-III, Indore Univ. July, 1977)A 230-V, 50-Hz, 6-pole, single-phase induction motor has the following constants.r, = 0.12 2, r, = 0.14 N, x, = x, = 0.25 Q, x„ = 15 2.If the core loss is 250 W and friction and windage losses are 500 W, determine the efficiency andtorque at s = 0.05.(Electrical Machines-IV, Bangalore Univ. Aug. 1978)Explain how the pulsating mmf of a single-phase induction motor may be considered equivalent totwo oppositely-rotating fields. Develop an expression for the torque of the motor.A 125-W, 4-pole, 110-V, 50-Hz single-phase induction motor has the no-load rotational loss of 25watts and total rotor copper loss at rated load of 25 watts at a slip of 0.06. The rotor *R loss may beneglected.At a slip s = 0.06, what is the power input to the machine ?(Electrical Machines-III, Indore Univ. July 1977)

Answered: Image /qna-images/answer/d3879cb3-9c76-4526-88b8-ea9b7c16d7fd.jpg

A l-0, induction motor has stator windings in space quadrature and is supplied with a single-phase voltage of 200 V at 50 Hz. The standstill impedance of the main winding is (5.2 +j 10.1) and of the auxiliary winding is (19.7 + j 14.2). Find the value of capitance to be inserted in the auxiliary winding for maximum starting torque. (Electrical Machines-III, Indore Univ. July, 1977)

A l-0, induction motor has stator windings in space quadrature and is supplied with a single-phase voltage of 200 V at 50 Hz. The standstill impedance of the main winding is (5.2 +j 10.1) and of the auxiliary winding is (19.7 + j 14.2). Find the value of capitance to be inserted in the auxiliary winding for maximum starting torque. (Electrical Machines-III, Indore Univ. July, 1977)

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Similar questions

7-
Three Phase Induction Mot... The relative speed of stator magnetic field with respect to rotor of a 30 induction motor with 4 pole, 50 Hz frequency. If the slip is 0.05.
Discuss the behaviour of an induction motor when it is rotating at synchronous speed.
What is the relationship between slip s) and load (Pa) in an induction motor? Please explain.
A 3-phase, 60 Hz induction motor has two poles. If the slip is 2% at a certain load, determine the synchronous speed, the speed of the rotor and the frequency of the induced e.m.f.'s in the rotor.
DC motr
(Qld) A three-phase 20-pole induction motor is rated at 800 V, 50 Hz. What is the synchronous speed of this machine if the voltage at its terminals is reduced to 400 V (a) 150 rpm, (b) 300 rpm, (c) 600 rpm, (d) 3000 rpm
h has rotor e.m.f. Speed of the induction motor and the frequency of its [970 r.p.m.; 1.5 Hz] 4. A 3-phase, 50-Hz induction motor with its rotor star-connected gives 500 V (r.m.s.) at standstill between the slip-rings on open-circuit. Calculate the current and power factor at standstill when the rotor winding is joined to a star-connected external circuit, each phase of which has a resistance of 10 2 and an inductance of 0.04 H. The resistance per phase of the rotor winding is 0.2 2 and its inductance is 0.04 H. Also, calculate the current and power factor when the slip-rings are short-circuited and the motor is running with a slip of 5 per cent. Assume the flux to remain constant. [10.67 A; 0.376; 21.95 A; 0.303] 5. Obtain an expression for the condition of maximum torque of an induction motor. Sketch the torque- slip curves for several values of rotor circuit resistance and indicate the condition for maximum torque to be obtained at starting. If the motor has a rotor resistance of…
3. A 440V 60-hp six pole 60 hz A connected induction motor has the following parameters R1=0.048 R2= 0.035 Xm= 9.50 X1= 0.33 0 X2= 0.37 0 Pcore= 600W PF&W= 350W Use the Thevenin's Equivalent circuit concept to find: (a)Vth and Zth seen by the rotor circuit (b)The slip at which maximum torque occurs (c) the value of Max/pullout Torques (d) The starting torque.
Q.14. What is slip in an induction motor? Q.15. What is the value of slip at start in an induction motor?
Explain in detail the Starting of Induction Motors
9