Synchronous Machine Explanation and Demonstration




The stator is similar in construction that of a induction motor.The rotor can be Salient or Non-Salient. Field excitation is provided on the rotor by either permanent or electromagnets with number of poles equal to the poles of the RMF caused by stator.
Non-excited rotors are also possible as in case of reluctance motors
The rotor gets locked to the RMF and rotates unlike induction motor at synchronous speed under all load condition.All conventional power plants use synchronous generators for converting power to electrical form.They operate at a better power factor and higher efficiency than equivalent induction machines.

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Synchronous Machine Construction




Synchronous Machine Equivalent Circuit



Synchronous Machine Phasor Diagram




Excitation and Stator induced voltage


 



Effect of Load Change (Field constant)





Effect of Field Change (Load constant)



V curves


Torque versus Load Angle 




Example 1
A six-pole 60 Hz synchronous motor is operating with a developed power of 5 hp and a torque angle of 5o. Find the speed and developed torque. Suppose that the load increases such that the developed torque doubles. Find the new torque angle. Find the pull-out torque and maximum developed power for this machine.









Torque versus Speed




Example 2
An eight-pole, 240 V-rms, 60 Hz, delta connected synchronous motor operates with a constant developed power of 50 hp and a torque angle of 15o at unity power factor. Suppose  the  field current is increased by  20%. Find the new torque angle and power factor. Is the new power factor lagging or  leading? Assume linear magnetic characteristics.


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1 comment:

  1. Odesigning SolutionsMay 19, 2012 at 7:37 PM

    i want to get this book will you please tell me name and author ?

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