Invention Grant
- Patent Title: Variable torque control of a stepper motor
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Application No.: US14634683Application Date: 2015-02-27
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Publication No.: US09461570B1Publication Date: 2016-10-04
- Inventor: Navid Poulad , Jijie Xu , Christopher D. Coley
- Applicant: Amazon Technologies, Inc.
- Applicant Address: US WA Seattle
- Assignee: Amazon Technologies, Inc.
- Current Assignee: Amazon Technologies, Inc.
- Current Assignee Address: US WA Seattle
- Agency: Lee & Hayes, PLLC
- Main IPC: G05B19/40
- IPC: G05B19/40 ; H02P8/30 ; H02P8/12

Abstract:
A stepper motor may be controlled by a controller to provide extended revolution of a motor shaft while operating in a first mode and to allow a user to manually intervene with an intended position or rotation of the motor shaft while operating in a second mode. In some embodiments, the controller may adjust a torque applied to the stepper mode during operation of the stepper motor. The controller may reduce a torque applied by the stepper motor to a lower torque while the user intervenes with the intended position or rotation of the motor and increase the torque to a holding torque after the user intervention has ended. Thus, the controller may dynamically adjust a torque of the stepper motor in response to detection of the user intervention.
Information query
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