To make a shaft rotate efficiently stably by preventing torque loss, while restricting the shift in the thrust direction of the shaft in a bearing section by a suction magnet.
For a dynamic pressure bearing type motor 100, a rotor shaft 140, which is a magnetic substance, is born rotatably by a dynamic pressure bearing 150, which is a magnetic substance inserted in a housing 110 shaped into a bottomed cylinder like form; and moreover, it includes an attractive magnet 170, which attracts the rotor shaft 140 in the direction of insertion, on the side of its bottom, which is the thrust receiver of the rotor shaft 140 in the housing 110. The suction magnet 170 is arranged, such that the center C1 of the face opposed to the tip 142 of the rotor shaft 140 is positioned on the axis C of the rotor shaft 140, on the side of the bottom of the housing 110, and also two sections, partitioned by a virtual plane which passes through the axis C, are magnetized so that they become different two poles.
SUZUKI KENJI
YAMAGUCHI KUNIYOSHI
YAMADA NOBUYUKI
TOTO LTD