Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2005-03-08
2005-03-08
Hsieh, Shih-Yung (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S727000
Reexamination Certificate
active
06864659
ABSTRACT:
An HVAC system has at least one variable speed controller for an AC induction motor, especially of the Permanent Split Capacitor (PSC) type. The variable speed controller provides switched power via a modulating triac to the main coils of the motor and constant power via an on/off triac to the auxiliary coils during operation. A large value capacitor is placed in line with the auxiliary coils to reduce power consumption and current draw over that of known systems. Power to the motor can be turned off to provide for motor speed sensing through monitoring the frequency of a generated voltage when the power is turned off. Frequency-based motor speed sensing is accomplished by shutting off all current to the motor and measuring zero crossings on the generated voltage of the decaying magnetic field. The controller can be easily retrofitted onto existing motors. An optional controller bypass is provided to run the motor at rated speed in case of controller failure.
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Translation Document (Abstract) FR 2608859 A1.
Lutton Larry L.
Ratz James W.
Sigafus Paul E.
Vrionis Nickolas G.
Hsieh Shih-Yung
Martin Edgardo San
Pauley Petersen & Erickson
Varidigm Corporation
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