Maurice Tutor

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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 28 Jan 2018 My Price 9.00

salient-pole synchronous machine

Figure 4.46 shows in schematic cross section a salient-pole synchronous machine having two identical stator windings a and b on a laminated steel core. The salient-pole rotor is made of steel and carries a field winding f connected to slip rings. Because of the nonuniform air gap, the self- and mutual inductances are functions of the angular position 00 of the rotor. Their variation with 00 can be approximated as

where Lo and L2 are positive constants. The mutual inductance between the rotor and the stator windings are functions of θ0

where M is also a positive constant. The self-inductance of the field winding, Lff, is constant, independent of 00. Consider the operating condition in which the field winding is excited by direct current If and the stator windings are connected to a balanced two-phase voltage source of frequency co. With the rotor revolving at synchronous speed, its angular position will be given by 00 = cot. Under this operating condition, the stator currents will be of the for

a. Derive an expression for the electromagnetic torque acting on the rotor.

b. Can the machine be operated as a motor and/or a generator? Explain.

c. Will the machine continue to run if the field current If is reduced to zero? Support you answer with an expression for the torque and an explanation as to why such operation is or is not possible.

 

 

 

Answers

Maurice Tutor
(5)
Status NEW Posted 28 Jan 2018 10:01 PM My Price 9.00

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