| 摘要 |
Power swivel for transmitting electrical power from a first terminal to a second terminal, includes a central part with a hub and an outer ring of a magnetic material, coaxial with and surrounding the hub, the outer ring and central part being rotatable relative to one another around a vertical axis, at least two radial arms of a magnetic material projecting from the hub or from the outer ring, adjacent arms being spaced-apart, each arm carrying a conductor wound around the arm to form a coil for generating a magnetic flux along a radial flux path through the arm, the conductors being connected to the first terminal, wherein the outer ring or the hub has a cylindrical surface at close proximity to free ends of the arms, a plurality of axially extending conductors being distributed along the circumference of the outer ring or hub at or near the cylindrical surface. |
| 主权项 |
1. Power swivel (2, 30) for the transmission of electrical power from a first terminal (23, 35, 36) to a second terminal (28, 47, 48), the swivel comprising a central part with a hub (31) and an outer ring (32) of a magnetic material, coaxial with the hub and surrounding the hub, the outer ring and the central part being rotatable relative to one another around a vertical axis (44), at least two radial arms (33, 34) of a magnetic material projecting from the hub or from the outer ring, adjacent arms being spaced-apart, each arm carrying a conductor (45, 46) wound around the arm to form a coil adapted for generating a magnetic flux along a radial flux path through the arm, the conductors being connected to the first terminal (35, 35′), wherein the outer ring or the hub has a cylindrical surface (36) at close proximity to free ends of the arms (33, 34), a plurality of axially extending conductors (37) being distributed along the circumference of the outer ring (32)or hub (31) at or near the cylindrical surface (32) such that a number of axial conductors is each time situated between two adjacent radial arms, pairs of axial conductors forming coils situated along the cylindrical surface adapted for generating a magnetic flux along a magnetic flux path extending in a circumferential direction through the outer ring or hub, a closed contour (56) being formed extending radially outwardly from a first radial arm (B4), into the outer ring, via the outer ring to the adjacent radial arm (B1) and radially inwardly along said adjacent arm (B2) and via the hub back to the first arm (B3). |
