A 220 V, 21 A, 1000 rpm dc shunt motor has an armature resistance of 0.05 ohm and a ﬁeld resistance of 220 ohms. The magnetization curve for the machine is given by the following table:’ Field current (A) 0.20.40.60.81.01.21.4 EMF at1000 rpm (V)50100150190219235245 Plot the speed-torque curve for the motor when: (a) no external resistances are included. (b) a resistance of 0.05 ohm is connected in series with the armature. (c) a resistance of 110 ohms is included in series with the ﬁeld winding.3- The motor in Problem 1 draws an armature current of 21 A on full load -and runs at 1000 rpm. If a resistance of 0.5 ohm is inserted in series with armature,determine:(a) the speed at full load torque,(b) the speed at 60 per cent of full load torque, and(c) the ratio of starting torque to full load torque.

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Answered: A 220 V, 21 A, 1000 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

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A 220 V, 21 A, 1000 rpm dc shunt motor has an armature resistance of 0.05 ohm and a ﬁeld resistance of 220 ohms. The magnetization curve for the machine is given by the following table:’

Field current (A)	0.2	0.4	0.6	0.8	1.0	1.2	1.4
EMF at1000 rpm (V)	50	100	150	190	219	235	245

Plot the speed-torque curve for the motor when:

(a) no external resistances are included.

(b) a resistance of 0.05 ohm is connected in series with the armature.

3- The motor in Problem 1 draws an armature current of 21 A on full load -and runs at 1000 rpm. If a resistance of 0.5 ohm is inserted in series with armature,

determine:

(a) the speed at full load torque,

(b) the speed at 60 per cent of full load torque, and

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