If the starter resistance is 1.9 ohms, what current does the motor take at the instant of starting in a shunt motor rated 25-hp. 230-volt, 600-rpm having armature and a field resistance of 0.275 ohm and 160 ohms, respectively. (Assume a 2-volt brush drop)

If the starter resistance is 1.9 ohms, what current does the motor take at the instant of starting in a shunt motor rated 25-hp. 230-volt, 600-rpm having armature and a field resistance of 0.275 ohm and 160 ohms, respectively. (Assume a 2-volt brush drop)

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter31: Controllers For Two-speed, Two-winding (separate Winding) Motors

Section: Chapter Questions

Problem 1SQ: Excluding slip, at what speed (r/min) will an eight-pole, 60-hertz, 240-volt motor run?

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Concept explainers

Motor Load, Torque, and Power Quality Requirement

An electric motor is a gadget that changes electrical energy into mechanical energy over to follow up on a mechanical burden. The weight set on the motor because of this mechanical movement is known as motor load. Appropriately matching the motor burden to the engine is vital to forestall harm to the engine or wasteful and unnecessary expensive activity. Engines perform such undertakings as moving a thing starting with one spot then onto the next, cutting it, changing its shape, etc. The motors might be evaluated as far as a few variables including power yield, voltage, current, and temperature. Harm to an engine might happen when it is worked under over the top engine load contrasted with its appraised limit.

Question

If the starter resistance is 1.9 ohms, what current does
the motor take at the instant of starting in a shunt motor
rated 25-hp. 230-volt, 600-rpm having armature and a
field resistance of 0.275 ohm and 160 ohms,
respectively. (Assume a 2-volt brush drop)

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