Sumitomo Heavy Industries, Ltd.

Hakuto Seisakusho Co., Ltd.

Teruo Takahashi

Tomohiro Koyama

Tatsuo Koizumi

Makoto Ishikawa

A coreless and brushless direct-current motor includes an armature coil wound without core and formed in the shape of a saddle; an outside rotor magnet formed by a permanent magnet, the outside rotor magnet being provided at an outside of the armature coil in the shape of a cylinder so as to face the armature coil, the outside rotor magnet being rotated by the magnetic field; an inside rotor magnet formed by a permanent magnet, the inside rotor magnet being provided in the shape of a cylinder at an inside of the armature coil so that the inside rotor magnet has a pole opposite to the outside rotor magnet and a rotational shaft is independently provided; an output shaft connected to the inside rotor magnet; and a sealing part of a barrier structure which sealing part partitions the armature coil and the outside rotor magnet to an outside of the inside rotor magnet and seals the armature coil and the outside rotor magnet.

Coreless and brushless direct-current motor, Gifford McMahon (GM) cryogenic cooler, pulse tube cryogenic cooler, cryopump, magnetic resonance imaging (MRI) apparatus, superconducting magnet (SCM) apparatus, nuclear magnetic resonance (NMR) apparatus, and cryogenic cooler for cooling semiconductor

Coreless and brushless direct-current motor, Gifford McMahon (GM) cryogenic cooler, pulse tube cryogenic cooler, cryopump, Magnetic Resonance Imaging (MRI) apparatus, Superconducting Magnet (SCM) apparatus, Nuclear Magnetic Resonance (NMR) apparatus, and cryogenic cooler for cooling semiconductor

Multi-layered hollow coil and apparatus and method of manufacturing thereof disclosed which includes a first regularly wound first portion of a coil due to a wire from a wire source by rotation of a coil metrix on a rotatable axle and subsequently spirally wound second portion due to a wire accumulated on a winding roller by reverse rotation of the coil matrix which is disposed between two flanges. In the first wound portion of multi-layers, layers in odd numbers are wound N times and other layers in even numbers are wound N-1 times, and the layers excepted a first layers are wound between crests of windings of the lower layer. The first wound portion is pressed between the flanges by a movable flange thereof and electrically melt. After united the first wound portion, the coil matrix is reversely rotated and the second wound portion is spirally wound adjacent to a side surface of the first wound portion, and both portions are pressed by the flanges and melt with one body of the coil which is removed from the coil matrix.

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Niihama, Japan

Teruo Takahashi