Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Hokkaido University

Japan Superconductor Technology Inc.

Osamu Ozaki

Koji Inoue

Hiroyuki Mitani

Kenichi Inoue

Hirofumi Hojo

Hiroyuki Takamatsu

Hiroshi Hashimoto

Kyoji Zaitsu

Eiichiro Yoshikawa

Takashi Hase

Naoya Fujiwara

Masatsugu Takemoto

Masakatsu Maruyama

Yasushi Maeda

Yoshio Okui

Chikara Ichihara

Takeshi Kamikado

Provided is a multilayer magnetic shieldformed of magnetic materials and disposed on the outer side of a superconducting magnetthe multilayer magnetic shieldincluding a first magnetic shielddisposed on the outer side of the superconducting magnetand a second magnetic shielddisposed on the outer side of the first magnetic shieldThe first magnetic shieldincludes a first cylinder sectionenclosing the superconducting magnetand a pair of first flange sectionsconnected to the first cylinder section. The second magnetic shieldincludes a second cylinder sectionenclosing the first cylinder sectionand a pair of second flange sectionsconnected to the second cylinder sectionThe second cylinder sectionis disposed in a position with a predetermined space S from the first cylinder sectionin the radial direction of the first cylinder section. The pair of second flange sectionsis disposed in positions with the predetermined space S from the pair of first flange sectionsin the axial direction of the first cylinder section

Multilayer magnetic shield

Disclosed is a brushless motor (A) which is an axial gap type brushless motor (A) wherein stators (A,A) comprising a coil () and a rotor () comprising a permanent magnet () are arranged with a gap therebetween in the axial direction. The coil () is a band-like wire which is spirally wound such that the width direction of the band-like wire generally coincides with the direction of the magnetic flux that is generated by the permanent magnet () of the rotor (). Consequently, the axial gap type brushless motor (A) having the above-described structure can be further reduced in eddy current loss in comparison to conventional brushless motors.

Axial gap type brushless motor

An axial motor includes a rotor arranged between a pair of stators with coils. In the rotor, a plurality of permanent magnets sandwiched between pairs of first magnetic materials and a plurality of second magnetic materials are alternately arranged in a rotation direction while gaps are provided therebetween. Since the permanent magnets are sandwiched by the first magnetic materials in the thus constructed axial motor, a field-weakening control can be performed. Since the second magnetic materials are provided, a reluctance torque can be generated. Further, since the gaps are provided, more magnetic fluxes generated from the permanent magnets can be caused to flow toward the coils. Therefore, the thus constructed axial motor can achieve a higher output, higher torque, higher efficiency, and miniaturization.

Axial motor

Provided is a reactor that enables high inductance to be generated with stability in a wide current range, while minimizing noise, processing cost, and eddy-current loss. The reactor (D) has the ratio (t/W) of the width (W) to the thickness (t) of a conductive member that composes an air-core coil configured to be 1 or less, and preferably, 1/10 or less. Furthermore, the reactor also has the absolute value of a value ((L&#x2212;L)/L) that has had: the difference (L&#x2212;L) between; the space interval (L) between an inner wall face of a first core member () and an inner wall face of a second core member (), at the innermost circumference position of the air-core coil (); and the space (L) between the inner wall face of the first core member () and the inner wall face of the second core member (), at the outermost circumference position of the air-core coil (); divided by an average value (L); configured to be 1/50 or less. The ratio (R/W) of the radius (R), from the axis-center (O) of the air-core coil () to the outer circumference of the air-core coil (), to the width (W) of the air-core coil () (conductive member), is 2=R/W=4.

Reactor

Growing community of inventors

Kobe, Japan

Osamu Ozaki