Electricity: motive power systems – Positional servo systems – With stabilizing features
Reexamination Certificate
2011-03-22
2011-03-22
Masih, Karen (Department: 2837)
Electricity: motive power systems
Positional servo systems
With stabilizing features
C318S729000, C318S805000
Reexamination Certificate
active
07911173
ABSTRACT:
A method of power control for an electrical motor using open-loop principles is disclosed. The method employs a desired control line function that determines hold-off time based on a detected phase lag of a motor drive signal. The motor to be controlled is driven with a motor drive signal at a given load for a first number of cycles to detect the phase lag of the motor drive signal. Controlling for phase lag for a second number of cycles is then accomplished by firing a thyristor according to the phase lag of the motor drive signal. Advantages include reduced power consumption of a motor controlled by an embodiment of the method or controller, and faster response time between the detection of load changes on the motor and the issuance of power control signals.
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Birch & Stewart Kolasch & Birch, LLP
Masih Karen
Power Efficiency Corporation
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