Can somebody explain the significance of appearance of one half of polepass freq sidebands around motor line current??That is against polepass freq of about 20cpm,sidebands of 10cpm alongwith harmonics are seen around line freq current in spectrum.Current waveform is also getting amplitude modulated at about same 10 cpm.

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Harpreet ,

If you are in * 50Hz* land and nominal speed at nameplate for 4- pole motor is 1480 rpm under nominal load I think perhaps  1490 rpm is his real speed under 60 percent load .

Meybe it is reason why is pole pass freq. is at half values .

Good luck !

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