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Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

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BuyFindarrow_forward

Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 35, Problem 4SQ
Textbook Problem
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Is it possible to transfer from high speed to low speed without pressing the medium push button? Why?

To determine

Explain whether the speed transfer from high speed to low speed without pressing the medium-speed push button is possible or not, and state the reason.

Explanation of Solution

Refer to Figure 35-1 in the textbook, which shows the push button speed selection for a wound rotor motor. In this circuit, the motor operates slowly by pressing low-speed push button and the energizing coil M, causing power to be supplied to the stator winding of motor through the load contacts M. Therefore, the motor runs with full resistance available in the secondary circuit.

When the medium-speed push button is pressed, contactor S energizes and closes the two S load contacts. This shorts the first bank of resistors out of the circuit and accelerates the motor to a higher speed. When the high-speed push button is pressed, contactor H energizes and shorts all the resistance out of the rotor circuit...

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