DYNAMIC PULSE-WIDTH MODULATION MOTOR CONTROL AND MEDICAL DEVICE INCORPORATING SAME
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Accused Products
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 sensor to obtain a measured displacement that is influenced by rotation of the rotor, and a control module coupled to the sensor. The control module adjusts a duty cycle for a modulated voltage applied to the motor in response to a difference between an expected displacement and the measured displacement. The expected displacement is influenced by or otherwise corresponds to a commanded rotation of the rotor.
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Citations
58 Claims
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1-15. -15. (canceled)
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16. An infusion device, comprising:
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a motor having a rotor, wherein a modulated voltage having a duty cycle is 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 corresponding to the duty cycle; a shaft mechanically coupled to the rotor, the shaft being displaced to deliver fluid in response to rotation of the rotor; a sensor to obtain a measured displacement that is influenced by rotation of the rotor; and a control module coupled to the motor and the sensor to operate the motor to provide a commanded rotation of the rotor and adjust the duty cycle for the modulated voltage in response to a difference between an expected displacement corresponding to the commanded rotation the measured displacement obtained after operating the motor to provide the commanded rotation. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 55, 56, 57, 58)
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25-35. -35. (canceled)
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51. An infusion device, comprising:
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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 sensor to obtain a measured displacement that is influenced by rotation of the rotor; and a control module coupled to the motor and the sensor to operate the motor to provide a commanded rotation of the rotor while a modulated voltage is applied to the motor, increase a duty cycle for the modulated voltage in response to a difference between an expected displacement corresponding to the commanded rotation the measured displacement obtained after operating the motor to provide the commanded rotation, and decrease the duty cycle when the measured displacement is equal to the expected displacement.
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52. An infusion device, comprising:
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a stepper motor having a rotor, the stepper motor having a first number of motor steps per revolution of the rotor; a shaft mechanically coupled to the rotor, the shaft being displaced to deliver fluid in response to rotation of the rotor; an incremental position sensor to obtain a measured number of incremental rotations of the rotor, the incremental position sensor detecting a second number of incremental rotations of the rotor per revolution of the rotor; and a control module coupled to the stepper motor and the incremental position sensor to; operate the motor to provide a number of commanded motor steps of rotation of the rotor while a modulated voltage is applied to the motor; determine an expected number of incremental rotations expected to be detected by the incremental position sensor in response to the number of commanded motor steps based on the number of commanded motor steps and a relationship between the first number and the second number; and adjust a duty cycle for the modulated voltage in response to a difference between the expected number of incremental rotations and the measured number of incremental rotations obtained after operating the motor to provide the number of commanded motor steps. - View Dependent Claims (53, 54)
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Specification