Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 55, Problem 7SQ
To determine
Name the type of motor that should be used with variable-frequency drives that use IGBTs.
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Electric Motor Control
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- What are some ways to test the strength of a vibration motor?arrow_forwardWhich of the following is an example of a manual speed controller for a wound-rotor motor? a. Variable frequency drive b. Timers/Control Relays c. SCR Controller d. Faceplate Controllerarrow_forwardWhat is the condition of a unipolar stepper motor if the resistance reading is always low?arrow_forward
- A 240-volt shunt motor takes 5 amperes on no-load. The armature resistance is 0.25 ohm and the field resistance is 200 ohms. Calculate the efficiency when taking full load current of 50 amperes and the percentage change in speed between no-load and full-load.arrow_forward(Im) Does the excitation circuit current change as the motor current changes? explain the reasons. (DC shunt motor).arrow_forwardExplain with mathematical reasons why direct current motors cannot be operated from a constant voltage source. If a direct current motor is desired to be operated from a constant voltage source, explain the application to be done.arrow_forward
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