Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2011-01-11
2011-01-11
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S809000
Reexamination Certificate
active
07868580
ABSTRACT:
A method for turning a three-phase alternating current motor on again, after it has been separated from a supply voltage, if a residual field voltage induced by a rotor residual field is present, and to an electrical circuit for implementing the method. The time progressions of the residual field voltage and the supply voltage are recorded, and the phase difference between the voltages is calculated in advance from the time progressions. A time point tsis determined, at which the phase difference goes below a predetermined maximum value Δφmax. A switching command for applying voltage is triggered at a time interval that corresponds to a predetermined switching time delay τs, before the time point tsis reached, so that the motor is connected to the supply voltage approximately at the time point ts. The electrical circuit has a measurement value detection device, a microcontroller and a direct current setting device.
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Pittius et al., “Über die dynamischen Beanspruchungen in den Wellensträngen grosser Gebläseantriebe bei der Netzumschaltung von Asynchronmaschinen-Gruppen,” Archive for Electrical Engineering, vol. 71, 1988, pp. 399-411.
H. O. Seinsch, “Drehmomentbeanspruchungen im Wellenstrang von Asynchronmotoren bei Schnellumschaltungen,” Elektrie, Berlin 1992, vol. 46, pp. 456-460.
Kern Ulrich
Pöhler Stefan
Seinsch Hans Otto
Atlas Copco Energas GmbH
Collard & Roe P.C.
Ro Bentsu
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