Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-04-30
1999-07-13
Enad, Elvin G.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 59, 310 62, 310 54, 310227, 310 58, 310 52, H01R 3908
Patent
active
059231130
DESCRIPTION:
BRIEF SUMMARY
A This invention relates to an arrangement for the transfer of electric current, a liquid medium and a gaseous medium between a section in a fixed position and a section rotating in relation thereto, i.e. a sort of a slip-ring arrangement, the arrangement for the transfer of electric current comprising sliding surfaces supported by the rotating section and sliding brushes supported by the fixed section and arranged to press against the sliding surfaces, and a protective casing surrounding them, the arrangement for the transfer of a liquid medium comprising for each medium circuit a passage parallel with the rotation and arranged at the boundary surface between the fixed section and the rotating section, with which passage transfer pipes in both sections communicate and which is sealed in the axial direction of the rotating section with seals arranged on both sides of the passage, and the arrangement for the transfer of a gaseous medium comprising a collector chamber arranged in the fixed section and at least one outlet pipe connected to said chamber for leading the gaseous medium out of the rotating section, which has been given a tubular form.
An arrangement described above may have to be utilized for instance when different kind of equipment is hung on a rotating, vertical tubular shaft via which electric current, lubricating oil, cooling air etc. has to be fed to said equipment. Such a situation may arise e.g. in connection with a propeller drive arrangement described in Canadian Patent 1,311,657. In this arrangement the motor of a ship is arranged in a cylindrical chamber, which is secured pivotably to the body of the ship by means of a tubular shaft. Electric current to the electric motor arranged in said chamber is fed via said tubular shaft. Likewise necessary hydraulic fluids, lubricating oils and possible other liquids, such as bilge water, also have to be fed via said rotating tubular shaft. In addition, the motor may have to be cooled with coolant air, also via said tubular shaft.
If it is desired to construct the tubular shaft freely rotating or at least to allow the tubular shaft a relatively wide range of rotation, the different feeding arrangements needed have to be constructed by means of the arrangements described in the preamble. A problem in that case is the large space required by the different feeding arrangements in the axial direction of the tubular shaft. Such a considerable length is problematic for two reasons. Firstly, the space available inside the body of a ship is limited and the length of the necessary arrangements should thus be as small as possible. Secondly, the considerable length of the arrangements above the supporting point of the tubular shaft causes to the tubular shaft itself torsional forces that are difficult to control. For instance the slip-rings and the cabling necessary for the feeding arrangements for electricity easily weigh several hundreds of kilos when the power required by the motor is of the order of megawatts.
It is the object of the present invention to provide an arrangement for transmitting electric current, a liquid medium and a gaseous medium between a section fixed in its position and a section rotating in relation thereto so that the space occupied by this arrangement may be minimized especially in the axial direction of the rotating section. This is achieved with the arrangement of the invention, which is characterized in that the arrangement for the transfer of a liquid medium is coaxially arranged inside the arrangement for the transfer of electric current and that the protective casing of the arrangement for the transfer of electric current is essentially gas, tight and provides a collector chamber for the gaseous medium.
In the arrangement of the invention electric current, a liquid medium and a gaseous medium may thus be transmitted via a space the axially required space of which corresponds in practice with the space required by the arrangement for the transfer of electric current.
The cross section of the protective casing of the arrange
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Lassila Tommi
Leppanen Timo
Abb Azipod Oy
Enad Elvin G.
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