Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 42, Problem 11SQ
To determine
Explain how DC is obtained from a brushless rotor.
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Chapter 42 Solutions
Electric Motor Control
Ch. 42 - What are the two basic methods of automatically...Ch. 42 - What is an out-of-step relay?Ch. 42 - Why is an out-of-step relay used on automatic...Ch. 42 - Under what conditions will the out-of-step relay...Ch. 42 - What is the last control contact that closes on a...Ch. 42 - What influence do both of the polarized field...Ch. 42 - Prob. 7SQCh. 42 - Approximately how much time (in terms of...Ch. 42 - How does the AC coil of the PFR receive the...Ch. 42 - Why is a control relay (CR1) used in Figure 426?...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Why do we need to have brushes in a squirrel-cage rotor type induction motor? (short answer)arrow_forwardJustify why an electrostatic motor cannot be operated from dc supply.Derive the expression of average torque of this motor when it is suppliedfrom ac sourcearrow_forwardA certain dc motor produces a back emf of EA=240 V at a speed of 1200 rpm. Assume that the field current remains constant. Find the back emf for a speed of 600 rpm and for a speed of 1500 rpm.arrow_forward
- the relation between armature and field currents in a series connected DC motor is O It = If + la O It=la - If O If = laarrow_forwardIn dc machines, armature windings are placed on the rotor because of the necessity for Electromechanical energy conversion Generation of voltage Commutation O Development of torquearrow_forwardThe relation between armature torque and armature current of a DC motor is Parabolic Linear Inverse O Exponentialarrow_forward
- Answer the following:a. Draw the Salient Pole Rotor and Non-Salient Pole Rotorb. Give specific difference of the two rotors.c. What is the formula used in getting frequency?arrow_forwardSketch the torque versus speed characteristic for a series-connected dc motor.arrow_forwardWith the aid of a diagram as shown, explain how does AC generator work and describe the operating principle of a DC motor with an assistance of a figure.arrow_forward
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