Hitachi Metals, Ltd.

Noriyoshi Hirao

Kiyotaka Yamauchi

Shin Nakajima

Shunsuke Arakawa

Masahiro Mita

Osamu Shimoe

Masahiro Masuzawa

Takashi Sasaki

Yoshitaka Chiba

Michiyuki Fukushima

Toru Sugihara

Kenji Hasegawa

A brushless motor having permanent magnets that can be used as a prime mover for automobiles, in place of internal combustion engines, since the motor can yield high torque during low-speed rotation, as in the case of conventional types of brushless motors and can be used at high torque and with excellent motor efficiency at rotations three times as high as that of conventional types. The brushless motor having permanent magnets according to the invention comprises

Brushless motor having permanent magnets

A nano-crystalline soft magnetic alloy ribbon having a structure being occupied by nano-crystalline particles having an average particle size of 50 nm or less at least 50% of the alloy structure. A ceramic insulation coating is formed on its surface so that the coating becomes thicker at the both ends of the ribbon than at the center in the transverse direction of the ribbon and the thickness dx at the coating ends and the average thickness da of the coating determined by a mass measurement method are in the relations of 1.2 da.ltoreq.dx.ltoreq.5 da and dx.ltoreq.10 .mu.m. With a magnetic core using such a nano-crystalline soft magnetic alloy ribbon, magnetic components including saturable reactor, transformer, saturable transformer, acceleration cavity and surge absorbing elements such as surge block core in neutral beam injector can realize a higher performance. The invention also results in a higher reliability for the devices using such magnetic components.

Nano-crystalline soft magnetic alloy ribbon with insulation coating and

A surge current-suppressing circuit for an accelerator comprising a magnetic device inserted between a high-voltage DC power supply and an ion source for suppressing surge current generated when electric charge stored in a stray capacitance existing between the high-voltage DC power supply and the load is released at the time of short-circuiting of the load. The magnetic device comprises a magnetic core constituted by interlaminar-insulated thin ribbons of an iron-base amorphous or fine crystalline soft magnetic alloy. The iron-base fine crystalline soft magnetic alloy has the composition represented by the general formula:

Surge current-suppressing circuit and magnetic device therein

A wound magnetic core constituted by (a) a thin ribbon made of a fine crystalline, soft magnetic Fe-base alloy having the composition represented by the general formula:

Method for making wound magnetic core

Wound magnetic core

A high melting metal silicide sputtering target which comprises a fine texture whose stoichiometric composition grains of MSi.sub.2, where M represents a high melting metal, have a maximum grain size of 20 .mu.m, whose free silicon grains have a maximum grain size of 50 .mu.m and whose oxygen content is not more than 200 ppm and has a density ratio to the theoretical density of 99% or more has good film characteristics including the reduction in the number of grains formed on the sputtered film and is useful as an electrode material or a wiring material in semi-conductor devices.

Growing community of inventors

Kumagaya, Japan

Noriyoshi Hirao