To increase magnetic attraction force per volume of magnet, by providing a permanent magnet and a wheel arranged around an axle, also providing a void between the permanent magnet and the axle, and arranging a non- magnetic member and/or weak magnetic member in an internal peripheral part of the wheel, also arranging a ferromagnetic member in a peripheral part thereof.
A pair of ferromagnetic member 18, 18 constituting a peripheral member of a pair of wheels 12, 12 and a pair of non-magnetic members 13, 13 constituting an internal peripheral part of a pair of the wheels 12, 12 are connected to be arranged around an axle 11. A ring-shaped permanent magnet 14 is fixedly arranged between opposed side surfaces of a pair of wheels 18, 18. Further, a void part 15 is provided between the axle 11 and the permanent magnet 14. A magnetized direction (N pole, S pole) of the permanent magnet 14 is arranged in the thickness direction thereof. In the way, a magnet wheel 1, by the non-magnetic members 13, 13 and the void part 15, suppresses generation of ineffective magnetic flux f2, attraction force of the magnet wheel 1 is improved.
KURIYAMA YOSHIHIKO
TOKUNAGA MASAAKI
MATSUI KAZUMI
HITACHI METALS LTD