Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
2006-04-18
2006-04-18
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S254100, C318S132000, C318S434000, C310S220000
Reexamination Certificate
active
07030582
ABSTRACT:
Devices and methods for controlling brushless, sensorless DC motors are disclosed. In one embodiment, an electrical motor is provided with a rotor, a stator, and a semiconductor on insulator (SOI) application-specific integrated circuit (ASIC). The ASIC is configured to energize stator windings in a commutational sequence to drive the rotor. A motor controller embodiment is provided with a set of comparators and a clocked digital circuit. Each comparator determines a voltage polarity on a respective stator winding. The clocked digital circuit receives polarity signals from the comparators and detects zero crossings having an expected crossing direction, which are then used to determine a commutational sequence for energizing stator windings. A method embodiment is provided for driving DC motor windings. One method embodiment includes: receiving polarity signals, measuring intervals, and advancing a commutation state.
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Conley & Rose, P.C.
Halliburton Energy Service,s Inc.
Leykin Rita
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