Nichia Corporation

IP Co., Ltd.

K Technology Corporation

Kohei Ihara

Michiya Kume

Rie Yoshida

Masahiro Abe

Taku Ichimori

Shuichi Tada

Muneo Yamamoto

Keiki Nishino

Syuji Matsumura

Provided are molds for polar anisotropic ring-shaped bonded magnet molded articles which enable the production of bonded magnet molded articles with a high degree of roundness and only slight distortion, without the need for mold modification and preparation of a test mold, and a method of preparing such molds. The present invention relates to a method of preparing a mold for a polar anisotropic ring-shaped bonded magnet molded article, the method including: 1) determining the shrinkage length (Tc) of a desired polar anisotropic ring-shaped bonded magnet molded article using the following equation: Tc=T×(α1/100−α2/100); 2) determining the radius (Dm) of a magnetic pole portion of a mold cavity using the following equation: Dm=D/(1−α2/100); and 3) defining the outer peripheral shape of the mold cavity from the Tc, the Dm, and the number (P) of magnetic poles of the molded article.

Mold for and method of producing polar anisotropic ring-shaped bonded magnet molded articles

A bonded magnet is provided which includes first and second components. The first and second components have first and second non-action surfaces, and first and second action surfaces that intersect the first and second non-action surfaces, respectively. First and second flux groups curve inside the first and second components from the first and second non-action surfaces to the first and second action surfaces, respectively. The areas of the first and second non-action surfaces are greater than the first and second action surfaces, respectively. The flux densities on the first and second action surfaces are higher than the first and second non-action surfaces, respectively. The pole on the first non-action surface is opposite to the second non-action surface. The first and second non-action surfaces are coupled to each other. The first flux groups continuously extend from one to another.

Bonded magnet, bonded magnet component, and bonded magnet production method

Provided are molds for polar anisotropic ring-shaped bonded magnet molded articles which enable the production of bonded magnet molded articles with a high degree of roundness and only slight distortion, without the need for mold modification and preparation of a test mold, and a method of preparing such molds. The present invention relates to a method of preparing a mold for a polar anisotropic ring-shaped bonded magnet molded article, the method including: 1) determining the shrinkage length (Tc) of a desired polar anisotropic ring-shaped bonded magnet molded article using the following equation: Tc=T&#xd7;(&#x3b1;1/100&#x2212;&#x3b1;2/100); 2) determining the radius (Dm) of a magnetic pole portion of a mold cavity using the following equation: Dm=D/(1&#x2212;&#x3b1;2/100); and 3) defining the outer peripheral shape of the mold cavity from the Tc, the Dm, and the number (P) of magnetic poles of the molded article.

Method of preparing molds for polar anisotropic ring-shaped bonded magnet molded articles

The present invention relates to a composite component including a metal component having a substantially cylindrical shape or a substantially annular shape, and a ring-shaped bonded magnet disposed on the outer periphery of the metal component, the ring-shaped bonded magnet containing a thermoplastic resin, magnetic particles, and rubber particles.

Composite component comprising ring-shaped bonded magnet and method of manufacturing the same

A method for manufacturing a bond magnet includes providing a bond magnet composition including a magnetic material and a resin, extruding the bond magnet composition in one direction to produce a molded body while orienting the magnetic material in the one direction, magnetizing the molded body in the one direction using an axial magnetization to produce a magnetized molded body, and laminating the magnetized molded body to produce a laminated molded body including first magnetized molded layers and second magnetized molded layers. The first magnetized molded layers and the second magnetized molded layers are alternately laminated. A first magnetization direction of each of the first magnetized molded layers is opposite to a second magnetization direction of each of the second magnetized molded layers.

Bond magnet and method for manufacturing the same

The structure includes cylindrical columnar and tubular bonded magnets. The columnar magnet has at least one pair of N and S poles that are alternately produced in the longitudinal direction. The tubular magnet surrounds the columnar magnet, and has at least one pair of N and S poles that are alternately produced in the longitudinal direction. Poles of the columnar and tubular magnets that are opposed to each other in the direction perpendicular to the axis of the columnar magnet as the propulsion force direction are of opposite magnetic polarity so that magnetic fields are produced in the direction perpendicular to the propulsion force direction. The surface magnetic flux density profile balance can be smoothed by adjusting higher and lower parts of the profiles of the columnar and tubular magnets.

Cylindrical bonded magnet structure

A cylindrical bonded magnet is provided which is multipolar-magnetized in the axial direction and can be produced with high productivity. The cylindrical bonded magnet includes magnetic powder and resin. The cylindrical bond magnet is an integrally formed member. The cylindrical bond magnet is magnetized so that a plurality of N and S poles are alternately provided in the axial direction. In the cylindrical bonded magnet, a totally even number of at least four N and S poles are alternately provided. The surface magnetic flux density distribution has a substantially sinusoidal wave with the both ends of the sinusoidal wave corresponding to nodes when the surface magnetic flux of the cylindrical bonded magnet is measured as viewed from the side surface of the cylindrical bond magnet along the axial direction.

Growing community of inventors

Tokushima, Japan

Kohei Ihara