A 250V series motor runs at 500 rpm at rated load current of 75 A. The armature circuit has a resistance of 0.2 of which 0.07 is the resitance of the series field winding. If flux is proportional to the armature current, Find (a) The speed when the armature current is 40 A and the supply voltage drops by 10% from its normal value. (b) The speed when a 2 N resistance is connected in series with the armature and torque is 80% of the rated value, the supply voltage being 10% more than the nominal.
A 250V series motor runs at 500 rpm at rated load current of 75 A. The armature circuit has a resistance of 0.2 of which 0.07 is the resitance of the series field winding. If flux is proportional to the armature current, Find (a) The speed when the armature current is 40 A and the supply voltage drops by 10% from its normal value. (b) The speed when a 2 N resistance is connected in series with the armature and torque is 80% of the rated value, the supply voltage being 10% more than the nominal.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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A 250V series motor runs at 500 rpm at rated load current of 75 A. The armature circuit has a resistance of 0.2 of which 0.07 is the resitance of the series field winding. If flux is proportional to the armature current, Find (a) The speed when the armature current is 40 A and the supply voltage drops by 10% from its normal value. (b) The speed when a 2 N resistance is connected in series with the armature and torque is 80% of the rated value, the supply voltage being 10% more than the nominal.
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