Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2008-06-30
2011-11-15
Benson, Walter (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S254100, C318S434000, C318S438000, C318S139000
Reexamination Certificate
active
08058826
ABSTRACT:
In a normal operating mode, a motor controller provides motor drive current to windings of a motor based on sensor signals to drive the windings in a normal commutation sequence, and monitors for occurrence of a motor stall condition. Upon detecting the motor stall condition in a given commutation state, then in a first driving step, the windings are momentarily driven according to an advanced commutation state, and during the first driving step, a reverse transition of the sensor signals to a state corresponding to a preceding commutation state is detected. Upon completion of the first driving step when such a reverse transition of the sensor signals is detected, then in a second driving step the windings are driven according to the preceding commutation state until a forward transition of the sensor signals is detected, and in a third driving step the windings are momentarily continued to be driven according to the same commutation state notwithstanding the forward transition of the sensor signals before normal operation is resumed.
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Yedamale, Padmaraja; Microchip Technology, Inc., “Brushless DC (BLDC) Motor Fundamentals,” Microship AN885, 2003.
Liu Raymond Y.
Mock M. Robert
BainwoodHuang
Benson Walter
Luo David S
Woodward HRT, Inc.
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