When a series dc motor is operated without a load, which of the following conditions occurs? * O The armature speeds out of control The armature draws excessive current O The voltage requirement increases O The armature will not turn O O O

When a series dc motor is operated without a load, which of the following conditions occurs? * O The armature speeds out of control The armature draws excessive current O The voltage requirement increases O The armature will not turn O O O

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter43: About Dc Motors

Section: Chapter Questions

Problem 1SQ

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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

When a series dc motor is
operated without a load, which
of the following conditions
occurs? *
O The armature speeds out of control
The armature draws excessive
current
O The voltage requirement increases
O The armature will not turn
O O O

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