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Motor based condition monitoring

  • US 6,993,439 B2
  • Filed: 09/12/2003
  • Issued: 01/31/2006
  • Est. Priority Date: 09/13/2002
  • Status: Active Grant
First Claim
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1. A method of analyzing operating characteristics of a motor actuated system comprising the steps of:

  • sensing a current drawn by a motor for driving the system to obtain a current waveform in the time domain;

    identifying a predetermined number of brush-switching peaks in the current waveform corresponding to a predetermined rotational travel of the motor; and

    setting a width of the current waveform, defined by the predetermined number of brush-switching peaks, equal to a predetermined number of equally spaced increments to normalize the current waveform from the time domain to a set of data points defining a waveform in the spatial domain corresponding to the predetermined rotational travel of the motor.

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