| 摘要 |
<p>The object of the present invention is to provide an eddy current retarder capable of ensuring brake capacity and preventing magnetic leak. In one preferred embodiment of the invention, an eddy current retarder (1) comprises a first magnet ring (18) disposed opposite a brake rotor (3) and comprising a plurality of permanent magnets (16) disposed with a spacing in the circumferential direction, and a second magnet ring (7) disposed opposite the first magnet ring (18) and comprising a plurality of permanent magnets (10) disposed with a spacing in the circumferential direction, wherein the magnetic force of each permanent magnet (10) of the second magnet ring (7) is set larger than the total magnetic force of one or a plurality of permanent magnets (16) of the first magnet ring (18) serving as a partner in forming a magnetic circuit in a brake OFF state. As a result, the magnetic flux leaking to the brake rotor (3) during the brake OFF can be almost zeroed.</p> |
