Electricity: motor control systems – Specific feedback condition or device – Counter or back emf
Reexamination Certificate
2005-05-31
2005-05-31
Leykin, Rita (Department: 2837)
Electricity: motor control systems
Specific feedback condition or device
Counter or back emf
C318S254100, C318S132000, C318S434000, C318S811000
Reexamination Certificate
active
06901212
ABSTRACT:
A digitally adaptive controller circuit for commutating a brushless, sensorless, DC motor in either of two directions adapted to receive digital back electromotive force (BEMF) detector signals. The digital circuit is driven by an input clock that is adjustable to configure the motor controller for use with a broad range of DC motors. The circuit includes commutational logic that decodes a current commutational state and a user-definable binary direction input into logic levels for digital control signals for controlling motor drive switches. The circuit also includes a signature analyzer to compare logic levels in the BEMF detector signals with expected logic levels based on an expected rotor position and direction of rotation. The digital circuit commutates the motor if the logic levels in the BEMF detector signals are at the expected logic levels. The digital circuit is compact and simple enough to be deployed onto a single programmable logic device.
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Conley Rose PC
Halliburton Energy Service,s Inc.
Leykin Rita
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