Title:
APPARATUS AND METHOD FOR TRANSFERRING ELECTRICAL POWER TO A ROTATING SHAFT
Document Type and Number:
WIPO Patent Application WO/2013/085393
Kind Code:
A3
Abstract:
There is described an apparatus (2) for transferring electrical power to a rotating shaft (13, 43), the apparatus (2) comprising : - a first winding (21) in a stationary part of the apparatus (2) around the shaft (13, 43); - a second winding (23) on the shaft (13, 43) adjacent to the first winding (21), characterised in that apparatus further comprises: - a sensing device (48) adapted to sense the rotational frequency of the shaft ((13, 43); and - a variable frequency drive (45) adapted to adjust an input current frequency to the first winding (21) as a function of the rotational frequency of the shaft ( 13, 43), whereby a desired output voltage and frequency in the second winding (23) on the shaft (13, 43) can be obtained. There is also described a method for transferring electrical power to a rotating shaft (13, 43).
Inventors:
AUSTEFJORD ARNE (NO)
Application Number:
PCT/NO2012/050243
Publication Date:
March 20, 2014
Filing Date:
December 06, 2012
Export Citation:
Assignee:
NAT OILWELL VARCO NORWAY AS (NO)
International Classes:
H02M5/12
Foreign References:
| US20100224356A1 | 2010-09-09 | |||
| DE4101341A1 | 1992-07-23 | |||
| DE102005047551A1 | 2007-04-12 |
Other References:
See also references of EP 2789089A2
Attorney, Agent or Firm:
HÅMSØ PATENTBYRÅ ANS (Sandnes, NO)
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