A three-phase motor can be made to run backwards by A. connecting a resistor in series with the armature. B. reversing the control voltage connections. C. reversing three of its power leads. D. reversing two of its power leads.

A three-phase motor can be made to run backwards by A. connecting a resistor in series with the armature. B. reversing the control voltage connections. C. reversing three of its power leads. D. reversing two of its power leads.

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

Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.

Question

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20.a. A capacitive sensor is used to detect the presence of _______ objects.
A. ferrous
B. nonmoving
C. nonconductive
D. magnetic
20.b. A three-phase motor can be made to run backwards by
A. connecting a resistor in series with the armature.
B. reversing the control voltage connections.
C. reversing three of its power leads.
D. reversing two of its power leads.

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