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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 3SQ
Textbook Problem
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When the motor is being accelerated, must each speed push button be closed in succession? Why?

To determine

Explain whether each speed push button is closed in succession when the motor is being accelerated, 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 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. 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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