To provide a magnetic gear device which can provide large transmission torque.
A magnetic gear device 1 includes an external gear 5, an internal gear 6 and a stator gear 7. The external gear 5 includes an outside cylinder 21 and a plurality of outside magnet pieces 22A and 22B. The internal gear 6 includes an inside cylinder 31, a plurality of first inside magnet pieces 32A and 32B and a plurality of second inside magnet pieces 33A and 33B. The stator gear 7 includes a plurality of magnetic tooth parts 53 arranged between the external gear 5 and the internal gear 6. The plurality of first inside magnet pieces 32A and 32B of the internal gear 6 are juxtaposed so that different magnetic poles are adjacent in the peripheral direction of a cylinder hole 21a, and the plurality of second inside magnet pieces 33A and 33B are juxtaposed so that the same magnetic poles are adjacent in the peripheral direction of the cylinder hole 21a. Thus, the plurality of inside magnet pieces 32A, 32B, 33A and 33B form a magnetic flux converging part in which a magnetic flux concentrates.
FUJITA TOMOYUKI
ENOZONO MASATO
TODAKA TAKASHI
OITAKEN SANGYO SOZO KIKO