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US 9,379,652 B2Granted
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.
Claims20
A system comprising:
- a stepper motor having a rotor and sets of windings;
- a sensor to detect incremental rotations of the rotor;
- a modulation module to generate a modulated voltage oscillating between a first voltage and a second voltage, the modulated voltage being equal to the first voltage for a percentage of a time interval, the percentage corresponding to a duty cycle;
- a motor driver module coupled between the modulation module and the stepper motor to apply the modulated voltage to one or more of the sets of windings;
- and
- a control module coupled to the sensor, the modulation module, and the motor driver module to:
- operate the motor driver module to sequentially apply the modulated voltage to the one or more of the sets of windings in a particular order to produce a commanded number of motor steps of rotation by the rotor;
- obtain a measured number of the incremental rotations from the sensor after the stepper motor is operated to provide the commanded number of motor steps;
- increase the duty cycle for the modulated voltage in response to a difference between an expected number of incremental rotations corresponding to the commanded number of motor steps and the measured number of the incremental rotations;
- and
- detect a degradation condition based on the duty cycle.
8 more elements
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 oscillating between a first voltage and a second voltage, the modulated voltage being equal to the first voltage for a percentage of a time interval, the percentage corresponding to 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 and identify a degradation condition based on the duty cycle.
2 more elements
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 oscillating between a first voltage and a second voltage, the modulated voltage being equal to the first voltage for a percentage of a time interval, the percentage corresponding to 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 based on the duty cycle.
1 more element
Dependencies are inferred from the claim text.