Integrated multi-turn absolute position sensor for high pole count motors
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United States of America Patent
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May 24, 2016
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Jul 3, 2014
app pub date -
Dec 28, 2012
filing date -
Dec 28, 2012
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Abstract
Absolute multi-turn position sensing integrated within the structure of a hybrid stepper motor implemented by sharing the magnetic structure of the motor with the sensing means. An alternating magnetic field is obtained from a single magnet within the stepper motor rotor by use of alternating flux paths directed to large Barkhausen jump effect sensing elements. Pulses generated from the large Barkhausen sensing are decoded electronically and stored in a non-volatile memory to absolutely locate the motor position within a fraction of 1 electrical cycle of the motor over an arbitrary range. This coarse position sensing can optionally be extended by use of a higher resolution absolute within-electrical-cycle sensing means to provide integrated high resolution position sensing over an arbitrary number of revolutions.
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