To suppress leakages of magnetic fields reaching a brake drum from the magnets of magnet support cylinders via ferromagnetic plates, improve brake performance and reduce the thicknesses of ferromagnetic plates.
An eddy current decelerator comprises a guide cylinder 12, which has a hollow part with a rectangular cross-section and is made of a nonmagnetic material, magnet support cylinders 13 and 23, which are housed in the hollow part of the guide cylinder having at least one sides of them movable, a large number of magnets 15 and 25 arranged on the outer circumferential walls of the magnet support cylinders 13 and 23 in the circumferential directions with the same intervals, ferromagnetic plates 19 cast in the guide cylinder 12 at positions corresponding to the respective magnets 15 and 25 and a brake drum 2, which is connected to a rotary shaft so as to cover the guide cylinder 12 and has annular elements 7 and 8 made of a highly conductive material, such as copper, etc., on both its end parts which do not face the ferromagnetic plates 19. The end edges of the outer surfaces 19a of the ferromagnetic plates 19 are aligned with the boundaries between the brake drum 2 and the annular elements 7 and 8, and end edges of the inner surfaces 19b of the ferromagnetic plates 19 are aligned with the end edges of the outer surfaces of the magnets 15 and 25.
IWAO NOBUYUKI
KOBAYASHI SUSUMU
OGAWA MAKOTO
