Invention Grant
- Patent Title: Stall detection in stepper motors using differential back-EMF between rising and falling commutation phase of motor current
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Application No.: US16134046Application Date: 2018-09-18
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Publication No.: US10686391B2Publication Date: 2020-06-16
- Inventor: Sooping Saw , Rakesh Raja , Wen Pin Lin , Sudhir Nagaraj
- Applicant: Texas Instruments Incorporated
- Applicant Address: US TX Dallas
- Assignee: TEXAS INSTRUMENTS INCORPORATED
- Current Assignee: TEXAS INSTRUMENTS INCORPORATED
- Current Assignee Address: US TX Dallas
- Agent Ebby Abraham; Charles A. Brill; Frank D. Cimino
- Main IPC: H02P8/38
- IPC: H02P8/38 ; H02P8/34 ; H02P8/12

Abstract:
In one embodiment, a method includes detecting, by a stall detection sensor in a driver coupled to a stepper motor, a first set of time-off periods in a rising commutation phase of motor current during current regulation. The stall detection sensor further detects a second set of time-off periods in a falling commutation phase of motor current during current regulation. Next, the stall detection sensor compares the first set of time-off periods with the second set of time-off periods and determines whether the stepper motor is stalled based on the comparison of the first set of time-off periods with the second set of time-off periods.
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