Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Jim D. Childers0
Mohammed S. Arefeen0
Date of Patent
May 29, 2007
Patent Application Number
11343314
Date Filed
January 31, 2006
Patent Primary Examiner
Patent abstract
This invention detects a stall in a stepper motor by determining a motor winding current for each stepper pulse and determining if the winding current of a particular stepper pulse meets predetermined criteria. The motor winding current may be determined by measuring a voltage across an ON field effect transistor during a stepper pulse and calculating a winding current using an assumed ON field effect transistor resistance. The predetermined criteria may by a calculated motor winding current greater than a predetermined threshold, greater than prior pulse by more than a predetermined threshold or greater than a prior pulse by more than a predetermined factor.
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