| 摘要 |
<p>A homopolar device has a rotor (10) with an armature (12) made of ferromagnetic material, the outer circumferential portion (13) being of good electrical conductivity. The rotor (10) is surrounded by a ferromagnetic stator (16, 17, 18), field coils (19, 20) being provided on the stator (16, 17, 18) which may be connected to an alternating current supply to provide an alternating magnetic field which is substantially radial across the outer circumferential portion (13) of the armature (12). The stator (16, 17, 18) includes an annular ferromagnetic core (18), primary and secondary windings (21, 26) being provided on the ferromagnetic core (18), the primary winding (21) being connected electrically at axially spaced locations to the outer circumferential portion (13) of the armature (10), by means of rotary contacts (24, 25). Each of the rotary contacts (24, 25) includes a pair of annular elements (30, 31), one mounted on and in electrical contact with the armature (10) and the other in electrical contact with the primary winding (21). The first annular element (30) has a plurality of conductive sectors (38) separated by non-conductive sectors (37) and the second annular element (31) has one or more conductive sectors (40) with one or more non-conductive sectors (41), the conductive sectors (38) of the first and second annular elements (30) being arranged to maintain electrical contact upon rotation of the armature (10), the conductive sectors (38) on the first annular element (30) and the non-conductive sectors (41) on the second annular element (31) being dimensional and angularly disposed so that at all times there will be a break in the annular conductive path defined by the two annular elements (30, 31).</p> |
