公开(公告)号：US09461570B1

公开(公告)日：2016-10-04

申请号：US14634683

申请日：2015-02-27

Applicant: Amazon Technologies, Inc.

Inventor： Navid Poulad ,  Jijie Xu ,  Christopher D. Coley

IPC: G05B19/40 ,  H02P8/30 ,  H02P8/12

CPC classification number: H02P8/30 ,  H02P3/025 ,  H02P8/12 ,  H02P8/14

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.