Electricity: motive power systems – Synchronous motor systems
Reexamination Certificate
2007-09-06
2010-10-05
Benson, Walter (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
C318S400210, C318S400380, C318S434000, C318S437000
Reexamination Certificate
active
07808200
ABSTRACT:
A technique can recover from motor stalls caused by misalignment of motor position sensors such as Hall-effect sensors. In a normal operating mode, a motor controller provides motor drive current to the motor windings based on the sensor signals according to a normal commutation sequence, and monitors for occurrence of a motor stall condition. Upon detecting the motor stall condition, the motor controller first momentarily drives the windings according to one of an advanced commutation state and a delayed commutation state each adjacent to the given commutation state in the normal commutation sequence, and determines whether the motor stall condition persists. If the stall condition persists, then the motor controller next momentarily drives the windings according to the other of the advanced commutation state and the delayed commutation state. By this action, the controller attempts operation at both preceding and succeeding portions of the torque characteristic, such that operation with increased torque is ensured even though the direction of the sensor misalignment is unknown.
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Chung Estella C.
Liu Raymond Y.
Morita, Jr. William K.
BainwoodHuang
Benson Walter
Paul Antony M
Woodward HRT, Inc.
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