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Unformatted text preview: Lecture 11  EE743 Lecture 11  EE743 AC Machines Part II Professor: Ali Keyhani Professor: Ali Keyhani 2 Stator OnePhase TwoPole machines stator rotor asas winding is sinusoidally distributed Assume i as is a sinusoidal function of time ( 29 ) ( cos 2 esi e s as t I i + = I s : rms value e : electrical angular velocity esi(0) : angular position corresponding to the zero value of instantaneous current ) ( ~ esi s as I I = 3 Stator OnePhase TwoPole machines ( 29 s as s as i N cos 2 mmf = Recall Assume esi (0)=0 ( 29 ( 29 t I N e s s s as cos cos 2 2 mmf = ( 29 ( 29 ( 29 ( 29 ( 29 t t t I N t I N t s as s as e s s s e s s s s as , mmf , mmf cos 2 4 cos 2 4 , mmf  + + = + + = A B clockwise clockwise counter 2 1 dt d c t dt d c t s e e s s e e s  = = + = = A B 4 wave travels around the machine air gap at speed of e in clockwise direction or will appear as a constant set of north and south poles to an observer...
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 Spring '08
 Keyhani

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