(a) A 8 pole, 235 V lap connected de shunt motor has 34 slots, each containing 16 conductors. Itdraws a current of 39 A from the supply. The armature resistance and field resistance are 0,2 0and 116 Q respectively. The motor develops an output power of 5 kW. The flux per pole is 36mWb. Calculate (i) the speed (i) torque developed by the armature and (i) the shaft torque.(b) Three inductive coils each of inductance 24 mH are connected in star to a 3 phase 435 V, 55Hz supply. Calculate the inductance of each coil, when connected in delta to take the samesupply voltage and same line current.(a) Back emf(a) (i) Speed(a) (i) Torque developed(a) (i) Shaft torque(b) Inductance at delta connection

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from the supply. The armature resistar The motor develops an output power a speed (i) torque developed by the arma

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

Question

(a) A 8 pole, 235 V lap connected de shunt motor has 34 slots, each containing 16 conductors. It
draws a current of 39 A from the supply. The armature resistance and field resistance are 0,2 0
and 116 Q respectively. The motor develops an output power of 5 kW. The flux per pole is 36
mWb. Calculate (i) the speed (i) torque developed by the armature and (i) the shaft torque.
(b) Three inductive coils each of inductance 24 mH are connected in star to a 3 phase 435 V, 55
Hz supply. Calculate the inductance of each coil, when connected in delta to take the same
supply voltage and same line current.
(a) Back emf
(a) (i) Speed
(a) (i) Torque developed
(a) (i) Shaft torque
(b) Inductance at delta connection

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