Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1995-06-07
1997-06-03
Ip, Paul
Electricity: motive power systems
Induction motor systems
Primary circuit control
318800, 318806, 318798, H02P 540, H02P 600
Patent
active
056358113
ABSTRACT:
The invention relates to a method and apparatus for recognizing a standstill condition when restarting a power converter-fed AC motor without a tachometer generator. According to an embodiment of the invention, a standstill recognition method includes first and second active phases decoupled by a passive phase. In each phase, time characteristics of the orthogonal current components of a measured motor current are recorded, and the energy component of current from the second active phase is further evaluated to generate an average value. This generated average value and an upper range value are then compared to a limiting value, which will be exceeded when the AC motor is at a standstill. Thus, through application of a current measurement and a simple evaluation, one can quickly determine the actual state of the power converter-fed AC motor when restarting.
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Siemens Prospectus Simovert P Spannungszwischenkreis-Umrichter 6SE35/36 & 6SC36/37 fuer Antriebe bis 900kW, Order No. A19100-E319 A 371, 1989.
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Rebhan Matthias
Schierling Hubert
Ip Paul
Siemens Aktiengesellschaft
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