Determining a rotor offset
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United States of America Patent
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Jun 6, 2017
Grant Date -
Apr 6, 2017
app pub date -
Oct 6, 2015
filing date -
Oct 6, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A system and method for determining a microstep rotor offset of a stepper motor is provided. The system includes a microcontroller configured to control voltage applied to a first coil and a second coil provided to operate the stepper motor; a back electro-magnetic force (BEMF) detection circuit configured to detect BEMF generated from the stepper motor. The stepper motor drives a pointer with a pointer stop, and the system is configured to: 1) home the stepper motor to the pointer stop, and 2) perform an iterative operation to determine a specific microstep associated with the microstep rotor offset.
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