Motor health monitoring and medical device incorporating same
AssigneeMedtronic MiniMed, Inc.
InventorJacques L. Favreau
Life of this patent
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Abstract
Apparatus are provided for motor control systems and related medical devices. In one embodiment, a control system includes a motor having a rotor, a modulation module coupled to the motor, and a control module coupled to the motor and the modulation module. The modulation module generates a modulated voltage that is applied to the motor, and the control module adjusts a duty cycle of the modulated voltage to achieve a commanded rotation of the rotor and detects a degradation condition based on the duty cycle.
Claims15
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.
A system comprising:
- a motor having a 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 motor and 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 detect a degradation condition when the observed value exceeds a reference value.
A system comprising:
- a motor having a 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 motor and the modulation module to adjust the duty cycle to achieve a commanded rotation of the rotor and detect a degradation condition when the duty cycle exceeds an average of the duty cycle over a preceding time interval.
A system comprising:
- a motor having a 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 motor and the modulation module to adjust the duty cycle to achieve a commanded rotation of the rotor and detect a degradation condition when the duty cycle exceeds a reference value by a fixed duty cycle percentage.
A system comprising:
- a motor having a 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 motor and the modulation module to adjust the duty cycle to achieve a commanded rotation of the rotor and detect a degradation condition when the duty cycle exceeds a reference value by a fixed percentage of the reference value.
A system comprising:
- a motor having a 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 motor and the modulation module to adjust the duty cycle to achieve a commanded rotation of the rotor and detect a degradation condition when an average of the duty cycle over a preceding time interval exceeds a reference value.
Dependencies are inferred from the claim text.