rotor:
Rotor Equivalent Circuit
Slide3:
Induction Motor Equivalent Circuit
Slide4:
Synchronous Machine 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
Slide5:
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.