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Difference Between Transformer and Induction Motor
Eddy Current concept
Pe = Ke * Bmax
2 * f2 * t2 * V
fr= sfe
Torque speed
characteristic
Equivalent Circuit of Induction Motor
• An induction motor is a singly excited machine (as opposed to a
doubly excited synchronous machine), since power is supplied only
to the stator circuit.
• Begin with the transformer model
• Include the variable frequency and other similar induction motor
effects
Induced emf depends upon the difference
between the stator field and the rotor speed
2∏Fr Lr
Difference Between concentrated and Distributed
winding
Slotting as a Harmonic Influence and Rotor induced
mmf Harmonics
• Stator slots = Rotor slots (cogging)
• Stator slots = Rotor slots
Fault in Induction machines
Rotor
Stator
Home Work
• Time and space oriented Magnetic field
• Harmonics in Induction machine (specially third harmonics)
• Speed and leakage flux relationship
Conclusion
• Induction motor
• Curve
• Fields
• Effects and harmonics
10

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lecture 13.pptx