PPT ON INDUCTION MOTOR MODEL

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INDUCTION MOTOR MODEL  Presentation Transcript

1.INDUCTION MOTOR

2.Construction

3.The harmonics in the mmf can be further reduced by increasing the number of slots: e.g. winding of a phase  are placed in 12 slots:

4.In order to obtain a truly sinusoidal mmf in the airgap:

5.Sinusoidal winding for each phase produces space sinusoidal MMF and flux

6.Sinusoidal winding for each phase produces space sinusoidal MMF and flux

7.Sinusoidal current excitation (with frequency s) in a phase produces space sinusoidal standing wave MMF

8.Combination of 3 standing waves resulted in ROTATING MMF wave

9.Frequency of rotation is given by:

10.Rotating flux induced:

11.Per–phase equivalent circuit