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lect12

# lect12 - Lecture 12 EE743 AC Machines Reluctance machines...

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Lecture 12 - EE743 Lecture 12 - EE743 AC Machines Reluctance machines - Induction machines Professor: Ali Keyhani Professor: Ali Keyhani

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2 Two-Pole reluctance machines as axis θ r ϖ r as as’ as axis θ r ϖ r as as' bs bs' bs axis Single phase Two phase
3 Two-Pole reluctance machines Stator windings are assumed to be sinusoidally distributed For single phase machines excited by an AC current source, the generated flux wave has two opposite rotating mmf s (These motors are used in clocks and some other turntables) ( 29 ( 29 + + + - + = s esi e s s esi e s s s t I t I N φ θ ϖ φ θ ϖ ) 0 ( cos ) 0 ( cos 2 2 mmf 2 1 2 1 ( 29 ) 0 ( cos 2 mmf esi e as as as as as t i i i N θ ϖ + = =

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4 term results in counterclockwise (positive) travelling wave term results in clockwise (negative) travelling wave Two-Pole reluctance machines ( 29 s esi e t φ θ ϖ - + ) 0 ( cos dt d s e φ ϖ = ( 29 s esi e t φ θ ϖ + + ) 0 ( cos e s dt d ϖ φ - =
5 Two-Pole reluctance machines For reluctance machine (Fig. 1), ( 29 r B A l asas L L L L θ 2 cos - + = ( 29 r r as c e i W T θ θ = , ( 29 ( 29 2 2 1 2 cos as r B A l c i L L L W θ - + = ( 29 r as B r as e i L i T θ θ 2 sin , 2 =

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6 Two-Pole reluctance machines For two-phase reluctance machines (see Fig.1), only one constant-amplitude rotating air gap mmf is produced
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• Spring '08
• Keyhani
• Induction machines, Electric motor, Three-phase electric power, Two-pole induction machines, Two-Pole reluctance machines

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