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Hello to everyone,

have you some explanations about the phenomena in the subject?

I'm sure about the nature of the 300 Hz, is electric, but I don't have any idea about the origin.

The motor is AC, is about 100 kW, and have 2 poles (about 3000 rpm), on the plant there aren't other motor with this phenomena and there aren't DC motor. The vibration level is quite low, about 4 mm/s rms (0,16 inch/s rms)

Thanks

 

Tags: AC, 300, Motor

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John from PA posted:
VIBA posted:

 

I'm sure about the nature of the 300 Hz, is electric, but I don't have any idea about the origin.

 

What have you done that makes you sure it is electrical?  This isn't a VFD drive is it?

I'm sure because in asynchronous motor without VFD, if you change the load you can change the speed, and I 've done this test.

With a not significant change in speed (20 rpm / 0.33 Hz) I didn't see any change in 300 Hz (300 Hz is about 6x of motor speed so If was a multiple or a bearing I've to see move about 2 Hz).

There is another test but was impossible to perform.

 

RM

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