Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2005-03-08
2005-03-08
Martin, David (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S808000, C363S036000, C363S040000
Reexamination Certificate
active
06864660
ABSTRACT:
A method and a device for realizing an effective value of a quantity to be varied in an electrical load connected to a multi-phase switchable DC/AC frequency convertor comprising a plurality of controllable switches. The value is realized by varying a current or a voltage delivered by the DC/AC frequency convertor through suitable switching of the switches thereof, and wherein the quantity exhibits a load angle which, averaged in time, leads or lags the voltage or current being delivered. The method and/or the device is arranged for carrying out the steps comprising the defining of a dead zone having dimensions that are representative of an allowable amplitude and phase angle deviation in the quantity to be realized; the orienting of the dead zone with respect to the voltage or current delivered by the DC/AC frequency convertor by rotating the dead zone through the load angle in the direction of the delivered voltage or current; and the switching of one or more of the switches on the basis of the manner in which the deviation in the quantity to be realized extends beyond the dead zone, for the purpose of realizing the quantity during operation with an amplitude and phase deviation ranging within the dead zone.
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Colon Santana Eduardo
GTI Electroproject B.V.
Martin David
Porter Wright Morris & Arthur LLP
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