Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818



Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 35, Problem 2SQ
Textbook Problem

Must the stop button be pressed between speeds on acceleration or deceleration? Why?

To determine

Explain whether the stop button is to be activated between the speed acceleration or deceleration steps of the motor 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 the wound rotor motor. In this circuit, the motor operates slowly by pressing the low-speed push button and energizing coil M, causing the power to be supplied to the stator winding of a motor through the load contacts M. Therefore, the motor accelerates 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. Therefore, the resistance in the secondary circuit reduces and it accelerates the motor at a higher speed. When the high-speed push button is pressed, contactor H energizes and shorts all the resistance out of the rotor circuit. Therefore, the motor accelerates at the highest speed...

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