Method for detecting a fault condition

Details Method for detecting a fault condition Method for detecting a fault condition

2009-03-31

2011-11-15

Nguyen, Vinh (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

Reexamination Certificate

active

08058894

ABSTRACT:
A method for detecting and correcting for a step loss condition. A back electromagnetic force signal is measured and compared to a reference voltage. The motor continues operating and the back electromagnetic force signal is measured again and compared to the reference voltage. If the measured levels of the back emf voltages are less than the reference voltage, a step loss condition has occurred and the stator field is repositioned.

REFERENCES:
patent: 4422040 (1983-12-01), Raider et al.
patent: 7288956 (2007-10-01), De Cock et al.
patent: 2002/0171388 (2002-11-01), Seki
patent: 1968183 (2008-10-01), None
Semiconductor Components Industries, LLC (SCILLC), Jan. 2009—Rev. 6.1; AMIS-30623 Micro-stepping Motor Driver; Publication Order No. 30623/A; http://onsemi.com.
Semiconductor Components Industries, LLC (SCILLC), Jan. 2009; AMIS-30521/NCV70521 Micro-stepping Motor; http://onsemi.com.

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