Q2// A double-cage of a 3-phase, 60-Hz, 4-pole induction motor, the impedance of outer and inner cages at standstill are: Outer cage Z= (0.2+j) Inner cage 7;' = (0.0 2+j2) 92 1- Calculate the torque per phase in synch. watts at 4% slip and the rotor input phase voltage is 45 V. 2- What slip will the torque contributed by the two cages be equal?

Q2// A double-cage of a 3-phase, 60-Hz, 4-pole induction motor, the impedance of outer and inner cages at standstill are: Outer cage Z= (0.2+j) Inner cage 7;' = (0.0 2+j2) 92 1- Calculate the torque per phase in synch. watts at 4% slip and the rotor input phase voltage is 45 V. 2- What slip will the torque contributed by the two cages be equal?

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

Electrical Engineering Consider a balanced 3-phase current flowing into the stator of a 2-pole induction motor. What should be the current expressions for a clockwise rotation of the magnetic field? For wt = 10, 100,200,300 show that the rotating magnetic field is actually rotating clockwise using stator conductor
List the different types of stray load losses in an induction motor.
A 6 pole, wave wound DC shunt generator has a useful total flux of 420 mWb. The armature winding consists of 220 turns each of 0.004 2 resistance, when running at 900 RPM the armature current is 50 A. If the armature winding reconnected as lap calculate the terminal voltage in case of wave and lap given that the field circuit and the speed are kept same.
Discuss the behaviour of an induction motor when it is rotating at synchronous speed.
Induct.motor.
Q2. A 230 V single-phase induction motor, 50 Hz, has the following winding impedances (at rest): Zm=28 <70° Q. Za=42 <45°Q A) Calculate the input current at start-up. B) Obtain the amount of capacitor in series with the auxiliary winding for which the torque Maximum startup. Then compare the input current, auxiliary winding current and torque all at start-up in two modes with and without starter capacitor.
i. Briefly describe the 5 major types of DC generators according to the manner in which their field flux is produced.
With the aid of diagrams describe the basic topology of a wound field 3 phase synchronous generator and outline the relationship between the excitation voltage and rotor current. Q2 (a) (b) Outline with the aid of a suitable diagram the necessary power conversion stages required to interface a small permanent magnet (PM) generator to a stand alone DC system. A star connected 3 phase wound field synchronous generator with a synchronous reactance of 20 N is connected to a 6.6 kV (phase voltage) grid and supplies 1.5 MW at 0.95 lagging power factor at its terminals. Calculate the phase current and resultant voltage across the synchronous reactance (Vxs), and from a scaled phasor diagram graphically determine the required excitation voltage (Eph) and load angle (8). (c) The load is now increased to 3 MW with the Excitation Voltage kept constant. Using the phasor diagram drawn in part (c) graphically determine the resultant phase current, power factor and load angle. (d)
32. The star connected rotor of a a 3-phase induction motor has a resistance and standstill reactance of 0.4 ohms/phase and 2.5 ohm/phase respectively. The emf induced between slip rings at stand still is 80 V, the stator being connected to small supply voltage. Find the rotor current and power factor at starting current when the rings are (i) short circuited (ii) joined to a star star-connected resistance of 5 ohm/phase.
9