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- W2080656412 abstract "ABSTRACT Until now direct-current motors fed by thyristor rectifiers have dominated as variable-speed drive systems for oil-drilling applications. During drilling of a test well at Rogaland Research Center in Stavanger, Norway, a new drilling system The Power Swivel was tested and the conventional DC motor/SCR system was replaced by an asynchronous motor fed by a GTO frequency converter. Whilst an enclosure of protection class Ex(P) is required for DC motors operating in hazardous area, asynchronous motors can also be built to protection class Ex(d), (e), or (n) for this type of application." @default.
- W2080656412 created "2016-06-24" @default.
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- W2080656412 date "1985-09-10" @default.
- W2080656412 modified "2023-09-23" @default.
- W2080656412 title "AC Drives For Drilling" @default.
- W2080656412 doi "https://doi.org/10.2118/13995-ms" @default.
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