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Fumitoshi Yamashita
Fumitoshi Yamashita, Kitasaku-Gun JP
| Patent application number | Description | Published |
|---|---|---|
| 20100043206 | Method of manufacturing rotor magnet for micro rotary electric machine - A method of manufacturing a rotor magnet for a micro rotary electric machine is provided which includes steps of: a process in which a plurality of thick films, each of which is made of nanocomposite texture composed of αFe and R-TM-B where R is either 10 to 20 atomic % Nd or 10 to 20 atomic % Pr, B is 5 to 20 atomic % and TM is either Fe or partly Co-substituted Fe with 0 to atomic %, are formed into a laminated magnet including isotropic nano-crystalline texture which contains αFe and R | 02-25-2010 |
| 20100219921 | RARE-EARTH IRON-BASED MAGNET WITH SELF-RECOVERABILITY - A rare-earth iron-based magnet with self-recoverability is provided and includes a plurality of segments, wherein the segments each include a matrix having a microstructure in which rare-earth iron-based aligned magnetic powders of at least one kind are solidified by a cross-linking reaction phase and also in which the cross-liking reaction phase and a viscous deformation phase resulting from on a viscosity flow are chemically bound to each other between the magnetic powders, and wherein while the inner and outer circumferential surfaces of the segments are constrained, the fracture surfaces of the segments, and also the segments on a needed-basis, are mutually aggregated and rigidified together by taking advantage of self-recovery function based on viscous deformation caused by heat and external force and also on cross-linking reaction. | 09-02-2010 |
| 20110074531 | ANISOTROPIC RARE EARTH-IRON BASED RESIN BONDED MAGNET - Anisotropic rare earth-iron based resin bonded magnet comprises: [1] a continuous phase including: (1) a spherical Sm | 03-31-2011 |
| 20110121675 | METHOD OF RARE EARTH-IRON BASED ANNULAR MAGNET AND MOTOR FABRICATED THEREBY - Improvement of torque densities, miniaturization and weight saving for outer rotor type motors or permanent-magnet-field-type DC motors can be efficiently achieved by high-energy densification of a magnet. However, torque pulsation or armature reaction gives negative influences thereto. Further, in application of a slotless (coreless) structure eliminating the torque pulsation or the armature reaction, the magnetic resistance of motor magnetic circuits will be enhanced. For solving the above problems, there is provided an annular magnet that is opened in a reverse direction relative to the opening direction of a U-shaped segment fabricated in constantly-directed magnetic fields, the annular magnet having an anisotropic distribution where angles relative to inner peripheral tangent lines can be continuously changed in the range of approximately 0 to 90 degrees, and having energy density (BH) | 05-26-2011 |
Fumitoshi Yamashita, Miyota-Machi JP
| Patent application number | Description | Published |
|---|---|---|
| 20100308679 | MICRO ROTOR AND ROTARY ELECTRIC MACHINE INCORPORATING SAME - A micro rotor is disclosed and includes a plurality of circular or annular plate-shaped thick film magnets which each include an isotropic magnet with a thickness t | 12-09-2010 |
Fumitoshi Yamashita, Shizuoka JP
| Patent application number | Description | Published |
|---|---|---|
| 20100218365 | MANUFACTURING METHOD OF RARE EARTH-IRON RING MAGNET WITH CONTINUOUS ORIENTATION CONTROLLED ANISOTROPY - A process of manufacturing segments, an anisotropic direction of which is continuously changed in a plane vertically by a uniform magnetic field maintained in a constant direction and a process of arranging a plurality of segments on a circumference, extruding the segments in a ring shape by rheology based on the viscous deformation of the segments, from one thrust-direction end surface of the segments, and subsequently compressing the segments from both thrust-direction end surfaces of the segments are necessarily included. A ring magnet, anisotropy of which is controlled in a continuous direction, is provided, and a source for generating a static magnetic field has energy density (BH) max≧160 to 180 kJ/m | 09-02-2010 |
Fumitoshi Yamashita, Osaka JP
| Patent application number | Description | Published |
|---|---|---|
| 20100066192 | RADIAL-DIRECTION GAP TYPE MAGNET MOTOR - In a radial-direction gap type magnet motor, when an energy density increases, a direction change Mθ/φp of a static magnetic field with respect to a mechanic angle between different poles increases in an exponential manner and thus to decrease a cogging torque of the motor is not compatible to increase a torque density. In order to solve the problem, assuming that φt denotes a mechanic angle of a stator iron core teeth, φp denotes a mechanical angle of a magnetic pole, and Mθ denotes an angle of a static magnetic field with respect to a circumferential tangential line of a radial magnetic pole center, a radial-direction type magnet motor in which φt<φp, Mθ in a magnetic pole center region is 75 to 90°, and Mθ/φp≦7 is satisfied in the magnetic pole end region of φp×0.1°, and further, a static magnetic field generating source is configured as a magnetic anisotropic magnetic pole having an energy density (BH) max≧150 kJ/m | 03-18-2010 |
Fumitoshi Yamashita, Nara JP
| Patent application number | Description | Published |
|---|---|---|
| 20090007417 | Radial Anisotropic Magnet Manufacturing Method, Permanent Magnet Motor Using Radial Anisotropic Magnet, and Iron Core-Equipped Permanent Magnet Motor - In order to improve tranquility and controllability of an iron core-equipped permanent magnet motor with an improvement of a maximum energy product (BH) | 01-08-2009 |
| 20090021097 | PERMANENT MAGNET ROTATOR AND MOTOR USING THE SAME - A motor generally has a contradictory relation between decrease of cogging torque and increase of torque density. To overcome this problem, continuous direction control is provided for anisotropy with modification of magnetic poles so that the average absolute value of differences between Mθ and 90×sin [φ{2π/(360/p)}] is set to be 3° or less, where Mθ is a direction of anisotropy with respect to a radial tangent line of a magnetic pole plane, φ is a mechanical angle, and p is the number of pole pairs. | 01-22-2009 |
| 20090127960 | ANISOTROPIC PERMANENT MAGNET MOTOR - An anisotropic permanent magnet motor includes a stator and a rotor opposed to teeth of the stator with a gap therebetween, and the rotor includes an anisotropic permanent magnet disposed on a surface of a rotor yoke. The anisotropic permanent magnet has an orientation direction set in a direction normal to the outer-peripheral surface in a range of both θr°/2 from a magnetic pole center and continuously inclined toward a magnetic pole end with respect to a direction normal to the outer-peripheral surface. | 05-21-2009 |