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Motor health monitoring and medical device incorporating same

  • US 8,523,803 B1
  • Filed: 03/20/2012
  • Issued: 09/03/2013
  • Est. Priority Date: 03/20/2012
  • Status: Active Grant
First Claim
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1. An infusion device, comprising:

  • a motor having a rotor;

    a shaft mechanically coupled to the rotor, the shaft being displaced to deliver fluid in response to rotation of the rotor;

    a modulation module coupled to the motor, the modulation module generating a modulated voltage applied to the motor, the modulated voltage having a duty cycle; and

    a control module coupled to the modulation module to adjust the duty cycle to achieve a commanded rotation of the rotor, determine an observed value for a duty cycle metric based on the duty cycle and identify a degradation condition when the observed value exceeds a reference value.

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