Method of stall detection for stepper motor system

Details Method of stall detection for stepper motor system Method of stall detection for stepper motor system

2007-05-29

2007-05-29

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

C318S671000, C318S560000

Reexamination Certificate

active

11343314

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.

REFERENCES:
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patent: 6307726 (2001-10-01), Marshall et al.
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patent: 6681817 (2004-01-01), Hagano et al.
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patent: 2004/0032231 (2004-02-01), Ellerthorpe et al.
patent: 2004/0222779 (2004-11-01), Cock et al.

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