lect21

# lect21 - Lecture 21 EE743 3-Phase Induction Machines...

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Lecture 21 - EE743 Lecture 21 - EE743 3-Phase Induction Machines Steady-state model Professor: Ali Keyhani Professor: Ali Keyhani

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2 Three-phase induction machines 3-phase winding is located on the stator (stator winding) 3-phase winding is located on the rotor (rotor winding) Torque is produced from interactions of two rotating flux waves cr - axis as' as bs bs' as - axis bs - axis cs cs' cs - axis ar - axis br - axis br ar' br' cr cr' ar T l φ s φ r θ r ϖ r T e
3 Cutaway Views of Squirrel-cage Induction Motor

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4 Rotating stator flux wave The flux variation of coil a-a’ when it is energized can be written as: ( 29 ( 29 = D Px t B t x B a cos , B(t): time changing flux produced by v a (t) For sinusoidal v a (t) : : max B f s : supply frequency x: variable distance traveled from the ref P: Nbre of poles D: Diameter, (Px/D: is the angle in radians) winding distribution around the stator peripher ( 29 t B t B s ϖ cos ˆ = B ˆ D Px cos
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