| 摘要 |
PROBLEM TO BE SOLVED: To restrain magnetic flux leaking from an adjacent switch plate to a cylinder part of a rotor when the brake is set off, without losing braking force when the brake is set on. SOLUTION: This eddy current decelerating device consists of a rotor 8 collectively fixed to a rotating shaft, permanent magnets 6 which are retained facing the rotor 8 and so arranged on a retaining ring 4 of ferromagnetic material at specified intervals that the directions of magnetic poles are reversed to each other along the peripheral direction of the rotor 8, switch plates 7 of ferromagnetic material which are interposed between the permanent magnets 6 and the rotor 8 at the same intervals with the respective permanent magnets 6 of a permanent magnet 6 group, and retaining member 3 parts of nonmagnetic material which are interposed between the respective switch plates 7 of a switch plate 7 group. Ferromagnetic material 11 is arranged at the same intervals with the retaining member 3 parts, on the inner side surface of a longitudinal direction of the rotor rotating shaft in a case covering the permanent magnet 6 group. As a result, when the brake is set off, magnetic leakage to a rotor cylinder can be remarkably reduced, drag torque is reduced, and power loss can be restrained when brake is not operated.
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