Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Reexamination Certificate
2006-02-07
2006-02-07
Fletcher, Marlon (Department: 2837)
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
C318S132000, C318S254100, C318S434000, C318S430000, C318S432000, C318S434000, C318S654000, C318S601000, C318S605000, C318S700000
Reexamination Certificate
active
06995538
ABSTRACT:
A region judging circuit judges an electric angle region of a three-phase brushless DC motor based on an output signal of a resolver. A latch timing output circuit determines an optimum latch timing. A driving direction judging circuit judges a rotational direction of the motor based on a comparison in largeness between a pair of phase currents. A latch circuit latches a judgement result of the driving direction judging circuit at the latch timing designated by the latch timing output circuit and retains the judgement result until the next latch timing comes.
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Fletcher Marlon
Smith Tyrone
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