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# lect11 - Lecture 11 EE743 AC Machines Part II Professor Ali...

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Lecture 11 - EE743 Lecture 11 - EE743 AC Machines Part II Professor: Ali Keyhani Professor: Ali Keyhani

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2 Stator One-Phase Two-Pole machines stator rotor as’-as winding is sinusoidally distributed Assume i as is a sinusoidal function of time ( 29 ) 0 ( cos 2 esi e s as t I i θ ϖ + = I s : rms value ϖ e : electrical angular velocity θ esi(0) : angular position corresponding to the zero value of instantaneous current ) 0 ( ~ esi s as I I θ =
3 Stator One-Phase Two-Pole machines ( 29 s as s as i N φ cos 2 mmf = Recall Assume θ esi (0)=0 ( 29 ( 29 t I N e s s s as ϖ φ 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 φ φ ϖ φ ϖ φ φ - + + = + + - = A B clockwise clockwise - counter 2 1 dt d c t dt d c t s e e s s e e s φ ϖ ϖ φ φ ϖ ϖ φ - = = + = = - A B

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4 wave travels around the machine air gap at speed of ϖ e in clockwise direction or will appear as a constant set of north and south poles to an observer travelling at ϖ e in CW direction wave travels around the machine
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lect11 - Lecture 11 EE743 AC Machines Part II Professor Ali...

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