<p>A drawworks (10) comprising a permanent magnet motor (60) mounted inside a drum(40), said permanent magnet motor arranged to drive said drum via a gear system(50), characterised in that said gear system is located at least partially within said drum.</p>
申请公布号
EP2150483(A2)
申请公布日期
2010.02.10
申请号
EP20080737216
申请日期
2008.04.24
申请人
NATIONAL OILWELL VARCO, L.P.
发明人
KVERNELAND, HEGE;KYLLINGSTAD, AAGE;MOE, MAGNE, MATHIAS;BLOOM, ROBERT, LEWIS
