Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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What will be the effect of increasing the mechanical load on a synchronous motor? Assume the field current is kept constant. Explain using phasor diagrams
1. When the pole of an alternator increases, the prime mover speed is decreasing. Why?2. What are the advantages of brushless excitation of an alternator? Instead of brush what othercomponents are required?3. How armature reaction can be reduced? Why commutation problem occurs in an alternator?
What do you mean by 'V-curves' of a synchronous motor? Draw them showing leading power factor and lagging power factor regions.
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- What are typical applications of synchronous motors?arrow_forwardWe want a four-pole synchronous motor that operates at a speed of 1000 rpm. Determine the frequency of the ac source. List several other speeds that can be achieved by using synchronous motors operating from this ac source. What is the highest speed achievable?arrow_forwardQ.1 How can a synchronous motor be made to have a leading power factor? Select one: A. BY OVER-EXCITATION OF THE FIELD B. BY ADDING A CAPACITOR TO THE CIRCUIT C. BY CHANGING THE APPLIED VOLTAGE D. BY CHANGING THE NUMBER OF TURNS OF WIRE IN THE ROTORarrow_forward
- Explain the construction and working principle of three-phase induction motor.arrow_forwardComplete the blank If pole is 6 and Synchronous speed is 40 rev/sec of an induction motor , then the frequency f =..................................?arrow_forwardDiscuss the behaviour of an induction motor when it is rotating at synchronous speed.arrow_forward
- 1- To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be....... a) Reduced by 10%, b) Reduced by 20%, c) Increased by 10%, d) Increased by 20% 2. When maximum starting torqua ic ohtoinodarrow_forwardWhat are the main parts of an single phase induction motor? Explain the function Jeach,arrow_forward51. When a synchronous motor is said to be ... A) over-excited, it is operating at a a) lagging power factor b) unity power factor c) leading power factor d) none of the above B) under-excited, it is operating at a a) lagging power factor b) unity power factor c) leading power factor d) none of the above C). What is a typical slip of a synchronous motor? a) 0% b) 2-5% c) 7-9% d) none of the above D). Selsyn motors can be used to a) provide position control b) provide angular feedback information c) both "a" and "b" d) neither "a" nor "b"arrow_forward
- Draw and explain the equivalent circuit of a single-phase induction motor based on double field revolving theory. How can the performance of the motor be analysed?arrow_forwardGive two situations for which a synchronous motor would be a better choice than an induction motor in an industrial application.arrow_forwardSketch the V curve for a synchronous motor. Label the axes. Indicate where the power factor is lagging and where it is leading. Draw the phasor diagram corresponding to the minimum point on the V curve.arrow_forward
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