5%. (a) What is the synchronous speed of this motor? (b) What is the rotor speed of this motor at the rated load? ()What is the rotor frequency of this motor at the rated load? (d) What is the shaft torque of this motor at the rated load? *

5%. (a) What is the synchronous speed of this motor? (b) What is the rotor speed of this motor at the rated load? ()What is the rotor frequency of this motor at the rated load? (d) What is the shaft torque of this motor at the rated load? *

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 6RQ: Name three factors that determine the torque produced by an induction motor.

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Concept explainers

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.

Question

A 230V, 10 kW, 4 pole, 50 Hz, three-phase Y-connected induction motor has a full-load slip of
5%.
(a) What is the synchronous speed of this motor?
(b) What is the rotor speed of this motor at the rated load?
(c) What is the rotor frequency of this motor at the rated load?
(d) What is the shaft torque of this motor at the rated load? * A

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An 8 pole, 50 Hz slip ring induction motor runs at a slip of 2.67% on full load. The rotor resistance per phase of the winding is 0.2 ohm. What external resistance per phase must be added in the rotor circuit so that the motor now runs ate a slip of 17.33% such that the torque remains same in both the cases. (Ans: 1.1 ohm)
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A) At what percentage of slip is the pull-out or breakdown torque of a typical 3-phase squirrel- cage induction motor reached? 21. a) 3% slip b) 10% slip c) 20% slip d) none of the above B) If load is increased beyond the breakdown torque, what happens to the speed of the motor? a) it stops b) it may speed up beyond its rated rpm c) its speed will not change, but its current will go down d) none of the above
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Example -6. A three-phase, 60-Hz, four-pole induction motor runs at a no-load speed of 1790 r/min and a full-load speed of 1720 r/min. Calculate the slip and the electrical frequency of the rotor at no-load and full-load conditions. What is the speed regulation of this motor? Omar
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