A 180kW, 230V, 435 rpm dc shunt motor has a nominal full-load current of 860A.(a) Calculate the total losses and efficiency at full load and rated speed.(b) Find the shunt field exciting current if the shunt field causes 20% of the total losses.(c) Calculate the value of the armature resistance and the back emf, if 50% of the totallosses at full-load are attributable to the armature resistance. [(d) Find the field current to make the motor run at 1000 rpm under no load. [C(e) Identify the motor efficiency if it is operating at half rated current at 1000 rpm. Assumethat mechanical losses are linearly proportional to speed. [C

As per the guidelines, we supposed to answer first three part of the question at a time so please…

Answered: A 180kW, 230V, 435 rpm dc shunt motor…

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...

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A three-phase, 460 V, 98hp 1,60 Hz, four-pole induction machine delivers rated output power at a slip of 0.05. Determine: (i) The synchonous speed. (V) speed at half Load (ii) The motor speed. (iii) The rotor frequency. (iv) The slip speed. ...A... -
A three-phase, 460 V, 98hp 1,60 Hz, four-pole induction machine delivers rated output power at a slip of 0.05. Determine: (i) The synchonous speed. (V) speed at half Load (ii) The motor speed. (iii) The rotor frequency. (iv) The slip speed. ...A... -
1. The rotor resistance and reactance per phase of a three-phase wound rotor induction motor are 0.035 and 0.15 ohm respectively. If an additional resistance is added, the starting torque is one half of maximum torque and the full load torque is three-fourth of the maximum. Determine the following: a. Full load speed b. speed at maximum torque c. value of additional resistance per required to achieve these conditions.
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Q1: Fill in the following blanks: 1. In order to have sparkless commutation, the brushes should be placed along... 2. D.C. series motor are used in those applications where... required. 3. The self-induction of a coil undergoing commutation causes .. . at the brushes. .starting torque is
A wound-field DC motor has an armature resistance of 0.50 0 and a mechanical loss torque of 1.0 Nm at full-load speed. The armature voltage is 240 V and the no-load speed of the motor is 2500 rpm. If at full-load the shaft torque is 60.0 Nm and the field flux is reduced by 5% at full-load, determine: (i) The value of Kø,, where K is the armature constant and of is the field flux, at no-load and full-load. (ii) The full-load armature current. (iii) The full-load motor speed. (iv) The full-load efficiency of the motor if the power lost in the field winding is 100 W.

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