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# lect10 - Lecture 10 EE743 AC Machines Part I Professor Ali...

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Lecture 10 - EE743 Lecture 10 - EE743 AC Machines Part I Professor: Ali Keyhani Professor: Ali Keyhani

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2 Magnetic Flux in DC machines Φ /2 rotor stator I f S S N N V f + - . . . . . . x x x x x x Armature Winding I f Φ a
3 mmf produced by the armature and mmf produced by the field winding are orthogonal. Orthogonality of Magnetic Fields in DC Machines B I L F ( 29 o ILB L 90 sin = × = B I F Magnetic field due to field winding Magnetic field due to armature winding 90 o

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4 In all other machines (Reluctance, Induction, Synchronous, Stepper motors, PM motors, …) torque is produced as result of one or more magnetic field which rotate about the air gap Magnetic Fields in other machines
5 3D=>2D presentation of AC machines stator rotor winding stator rotor

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6 Two-Pole Single-Phase Stator winding Coils are placed in slots over the inner circumference of the stator Coils are connected in series with a sinusoidal distribution as’ 2 Rotor Stator s φ as 1 as 2 as 3 as’ 1 as’ 3 as axis + - as 1 as’ 1 as 2 as’ 2 as 3 as’ 3 i as v as
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lect10 - Lecture 10 EE743 AC Machines Part I Professor Ali...

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