Lec12 - 341 Energy Conversion

Lec12 - 341 Energy Conversion - Lec 12 Induction Motors...

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341 - Electric Machinery Fundamentals MI - 1 Lec 12 Induction Motors Mahesh S. Illindala
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341 - Electric Machinery Fundamentals MI - 3 AC Induction Machine Concept of rotor slip : The difference between synchronous speed and rotor speed is called slip speed e ind = ( v X B S ) l A voltage is induced on a rotor bar at a velocity relative to the magnetic field When 3- f currents flow in the stator winding, a rotating magnetic field B S is established and its speed of rotation is It drives a rotor current flow that produces a rotor magnetic field B R . The resulting torque is given by t ind = k( B R x B S ) There is NO induced voltage in the rotor bar if the rotor rotates at the same velocity as the magnetic field ( v = 0) n slip = n sync n m Slip is defined as s = n sync n m n sync ( x 100%) In an induction machine, the rotor field B R is derived from the stator. It is not from an external source. A squirrel-cage induction machine contains windings on the stator and shorted conductors on the rotor
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This note was uploaded on 04/01/2012 for the course ECE 341 taught by Professor Keyhani during the Fall '08 term at Ohio State.

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Lec12 - 341 Energy Conversion - Lec 12 Induction Motors...

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