| 摘要 |
Power swivel for transmitting electrical power from a first terminal to a second terminal, includes a central part with a huh 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, 35″) 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 pairs axially spaced apart radial arms (33,33′;34,34′) of a magnetic material projecting from the hub or from the outer ring, adjacent pairs of arms being spaced-apart in a circumferential direction, at least one arm in each pair of arms 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 number of circular conductors (71) extending in a circumferential groove (70) in the outer ring (32) or huh (31) at or near the cylindrical surface (36) for generating a magnetic flux along a magnetic flux path, the flux path extending radially outwardly along first flux path section (L1) from a first radial arm (33) in a pair of arms, into the outer ring, vertically downward along second flux path section (L2) in the outer ring (32) to the second radial arm (33′) in the pair, radially inward along third flux path section (L3) the second radial arm (33′) in the pair or arms and vertically upward along a fourth flux path section (L4) in the hub (31). |
