A three-phase Y-connected six-pole winding is installed in 36 slots on a stator. There are 150 turns of wire in each slot of the windings. All coils in each phase are connected in series. a) Assuming that the flux per pole in the machine is 0.06 Wb, and the speed of rotation of the magnetic field is 1000 rpm, - determine the frequency of the voltage produced in the winding, and - find the resulting phase and terminal voltages of this stator. b) What total rotor flux Or and speed of rotation nm would be required to produce a terminal (line-to-line) voltage of Vr = 13.2 kV with frequency fe = 50 Hz?

A three-phase Y-connected six-pole winding is installed in 36 slots on a stator. There are 150 turns of wire in each slot of the windings. All coils in each phase are connected in series. a) Assuming that the flux per pole in the machine is 0.06 Wb, and the speed of rotation of the magnetic field is 1000 rpm, - determine the frequency of the voltage produced in the winding, and - find the resulting phase and terminal voltages of this stator. b) What total rotor flux Or and speed of rotation nm would be required to produce a terminal (line-to-line) voltage of Vr = 13.2 kV with frequency fe = 50 Hz?

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

A 220 V , 60 Hz , supply is connected to 200 – turn armature winding of reluctance 1.7x105 At / Wb . Find the magnetizing reactance , the rms values of the ( magneto – motive force , exciting and armature currents , magnetic flux ) , and the inductance Draw the phasor diagram of the circuit .
A 4 pole dc generator runs at 750 rpm and generates an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb, If leakage coefficient is given as the ratio of the total flux/pole to the working flux per pole, find its value.
The total flux per pole in the air-gap of a 50-Hz alternator is 0.06 Wb. The flux-density distribution is given by T. The coil-span is 4/5 of a pole pitch. Determine the rms emf per armature turn. Find also the emf per armature turn when the flux were assumed to be sinusoidally distributed.
An 8 pole, lap connected armature has 500 conductors and its generated e.m.f is 120V. If the flux per pole is 20 mWb, then the speed of machine is, (a) 105 rpm (b) 420 rpm (c) 180 rpm (d) 720 rpm
ASAP a.) In a separately excited dc generator, if the current in the field winding increases, the terminal voltage of the machine _______. b.) If the value of the field flux in a dc generator increases, the generated emf will ________. choices: increase, decrease, the same, zero
The armature of a dc motor has 648 conductors, 65 % of which are directly under the pole where the flux density is 48,000 lines per in2. If the core diameter is 7 inches and its length is 4 inches and the current in each conductor is 20 A. What is the torque exerted in the armature in N-m?
A 220 V , 60 Hz , supply is connected to 200 – turn armature winding of reluctance 1.7x105 At / Wb . Find : the magnetizing reactance the rms values of the ( magneto – motive force , exciting and armature currents , magnetic fluxflu the inductance Draw the phasor diagram of the circuit
Electric Machines2 What are the characteristics of the rotating magnetic field created by three-phase current inthree-phase stator winding?
A 6-pole, dc machine has a double layer, lap winding in 63 slots. The coils in the machine have one turn each. There are 189 commutator bars. The flux per pole is 0.082 Wb. The rotor speed is 700 rev/min. a. Find the number of coils per slot. b. Find the number of conductors per slot. c. Is full-pitch winding possible? Why? d. Find the number for the bottom-layer conductor of coil 1. e. We can decide to use equalizers on this machine. Why? f. It is possible to use 21 equalizers on this machine. Why? h. Find the commutator bar(s) to be connected with the commutator bar 1 to an equalizer. i. Find the commutator bar(s) that must be connected to equalizer number 5 if 21 equalizers are used and commutator bar 1 is connected to equalizer number 1. g. Find the dc voltage that is generated in this machine.
DC MACHINE TORQUE The armature of a dc motor has 648 conductors, 65 % of which are directly under thepole where the flux density is 48,000 lines per in2. If the core diameter is 7 inchesand its length is 4 inches and the current in each conductor is 20 A. What is thetorque exerted in the armature in N-m?
A 6-pole, dc machine has a double layer, lap winding in 63 slots. The coils in the machine have one turn each. There are 189 commutator bars. The flux per pole is 0.082 Wb. The rotor speed is 700 rev/min. A. Find the number of coils per slot. B. Find the number of conductors per slot. C. Is full-pitch winding possible? Why? D. Find the number for the bottom-layer conductor of coil 1. We can decide to use equalizers on this machine. Why? E. It is possible to use 21 equalizers on this machine. Why?
The introduction of interpoles in between the main pole improves the performance of dc machines, because .................? (A) the interpole produces additional flux to augment the developed torque (B) the flux waveform is improved with reduction in harmonics (C) the inequality of air flux on the top and bottom halves of armature is removed (D) a counter Emf is induced in coil undergoing commutation