Title:
STEPPER MOTOR STALL DETECTION
Document Type and Number:
WIPO Patent Application WO/2011/073742
Kind Code:
A3
Abstract:
An apparatus (Fig. 2), system (Fig. 1), and method (Fig. 7) are disclosed for stepper motor 102 stall detection. A conversion module 106 receives 1206 a back electromotive force ("EMF") waveform 1002 produced in a non-driven coil of the stepper motor 102 by a magnetic field of a rotor of the stepper motor 102 during a full step operation 308, and samples 1208 the waveform 1002 at intervals starting at a predetermined time for a predetermined period of time within the full step operation 308 to yield a plurality of sampled data points. A rectification module 202 rectifies 1210 the waveform 1002 about a predetermined quiescent level 306. A comparison module 204 accumulates 1216 the rectified sampled data points into a statistically representative sampled value, compares the representative sampled value to a predetermined threshold level, and indicates 1224 a stall of the rotor.
Inventors:
GALIC GORDAN (HR)
FIOLIC GORAN (HR)
FIOLIC GORAN (HR)
Application Number:
PCT/IB2010/000316
Publication Date:
July 26, 2012
Filing Date:
January 17, 2010
Export Citation:
Assignee:
GALIC GORDAN (HR)
FIOLIC GORAN (HR)
FIOLIC GORAN (HR)
International Classes:
H02P8/38
Domestic Patent References:
| WO2007089258A1 | 2007-08-09 |
Foreign References:
| US20090256515A1 | 2009-10-15 | |||
| US5227709A | 1993-07-13 | |||
| US4467255A | 1984-08-21 | |||
| US20090238044A1 | 2009-09-24 |
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