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Tracking Open-Loop Stepper Motor Control Disclosure Number: IPCOM000060917D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09

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Cavill, BR Thomas, DC [+details]


A technique is described whereby speed, acceleration and deceleration of stepper motors are accurately controlled through the use of a microprocessor, encoders and sensors in a feedback circuit, thereby combining the best operational features of open- and closed-loop stepper motors. In the use of stepper motors, open-loop drives provide accurate speed control. However, because of the lack of feedback, response to loading or frictional variations is poor. If static loads are not within the limits expected, stalling often occurs during acceleration or deceleration.