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Recent content by TN1981

  1. TN1981

    Shaft rotational speed harmonics and cogging torque.

    Thanks for the input Greg. I would have thought that the 1X would have been affected the most also but I didn't see much of an event at 240 Hz (1X) We did a 3rd party analysis several years ago on 5th and 10th order and were able to trace it back to a magnitization issue but I think those 5th...
  2. TN1981

    Shaft rotational speed harmonics and cogging torque.

    To whom it may concern: I am investigating potential causes of some shaft speed related tones in a 3-phase 6 pole electric motor. Using a laser vibrometer, one of the recent motors tested showed signs of elevated 3X, 5X, and 11X shaft speed tones (1X = 240 Hz). This blower was further...
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