EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780176919962
Author: Herman
Publisher: VST
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Question
Chapter 32, Problem 1RQ
To determine
The way of operation of DC motor to operate below its normal speed.
Expert Solution & Answer
Explanation of Solution
A device which is used to convert the electrical energy into
In DC motor, direct current (dc) is converted into the mechanical energy.
The expression for the speed of the DC motor is given by,
There are various types of method to control the speed namely flux per pole method, armature resistance method and supply voltage method.
The voltage control method is best suited to operate the DC motor below its normal speed. The applied voltage is controlled by controlling the applied voltage. The voltage is applied to the armature and field, then the motor operates its normal speed. So, the speed of the motor is controlled by varying the applied voltage.
Thus, the way of operation of DC motor to operate below its normal speed are ecplained.
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motor supplies 200 kW at 6 Hz to flange A of the shaft shown in Figure. Gear B transfers 125 W of power to operating machinery in the factory, and the remaining power in the shaft is mansferred by gear D. Shafts (1) and (2) are solid aluminum (G = 28 GPa) shafts that have the same diameter and an allowable shear stress of t= 40 MPa. Shaft (3) is a solid steel (G = 80 GPa) shaft with an allowable shear stress of t = 55 MPa. Determine:
a) the minimum permissible diameter for aluminum shafts (1) and (2)
b) the minimum permissible diameter for steel shaft (3).
c) the rotation angle of gear D with respect to flange A if the shafts have the minimum permissible diameters as determined in (a) and (b).
Chapter 32 Solutions
EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
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