Induction motors unit iii
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1 INDUCTION MOTORS Name : Mrs.A.Sangari & Mrs.P.T.Subasini Designation : Sr. Lecturer & Lecturer Department : Electrical and Electronics Engineering Subject code : 131307 Year : II/ECE A & B Unit : IV
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Transcript of Induction motors unit iii
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INDUCTION MOTORSName : Mrs.A.Sangari & Mrs.P.T.SubasiniDesignation : Sr. Lecturer & LecturerDepartment : Electrical and Electronics Engineering
Subject code : 131307Year : II/ECE A & BUnit : IV
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induces a large voltage – hence large currents flow within the
rotor,
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producing a strong torque.
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Induction Motors: Slip
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The difference between the synchronous speed and rotor
speed can be
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expressed as a percentage of synchronous speed, known as
the slip.
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N Ns - s =
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Ns
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s = slip, Ns = synchronous speed (rpm), N = rotor speed
(rpm)
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• At no-load, the slip is nearly zero (<0.1%).