Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2008-02-29
2010-12-07
Benson, Walter (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S798000, C318S767000, C318S727000, C318S066000
Reexamination Certificate
active
07847510
ABSTRACT:
Systems and/or methods that facilitate efficiently controlling speed of an induction motor are presented. An optimized control component controls respective switching of an auxiliary switch component associated with an auxiliary winding of the motor, a main switch component associated with a main winding of the motor, and a capacitance adjuster switch component that facilitates adjusting the amount of capacitance associated with the auxiliary winding. The timing of switching on the auxiliary switch component and main switch component can be controlled such that there can be a time difference between the respective switching on of the auxiliary switch component and main switch component to produce additional phase shift to facilitate improving motor efficiency. The capacitance adjuster switch component can be switched on when motor speed is below a predetermined low speed threshold to facilitate increasing the amount of capacitance associated with the auxiliary winding to improve motor efficiency.
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Benson Walter
Foley & Lardner LLP
Johnson Controls Technology Company
Luo David S
LandOfFree
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