Patents by Inventor Nobuyuki Kifuji
Nobuyuki Kifuji has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10122231Abstract: Each of permanent magnets includes a magnet body formed across the radial direction of a rotor core, and a pair of magnet end parts bending toward the outer peripheral side of the magnet body and extending respectively from both ends of the magnet body in the peripheral direction toward the outer edge of the rotor core. Magnetization directions of the magnet end parts and a magnetic pole center line intersect with each other on the outer peripheral side of the magnet body. The inclination angle of each magnetization direction of the magnet end parts with respect to the magnetic pole center line is greater than the inclination angle of a magnetization direction of the magnet body with respect to the magnetic pole center line.Type: GrantFiled: September 30, 2013Date of Patent: November 6, 2018Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Nobuyuki Kifuji, Yoshiki Yasuda, Yoshinari Asano, Yasuhiko Ohsawa
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Publication number: 20150372547Abstract: Each of permanent magnets includes a magnet body formed across the radial direction of a rotor core, and a pair of magnet end parts bending toward the outer peripheral side of the magnet body and extending respectively from both ends of the magnet body in the peripheral direction toward the outer edge of the rotor core. Magnetization directions of the magnet end parts and a magnetic pole center line intersect with each other on the outer peripheral side of the magnet body. The inclination angle of each magnetization direction of the magnet end parts with respect to the magnetic pole center line is greater than the inclination angle of a magnetization direction of the magnet body with respect to the magnetic pole center line.Type: ApplicationFiled: September 30, 2013Publication date: December 24, 2015Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Nobuyuki KIFUJI, Yoshiki YASUDA, Yoshinari ASANO, Yasuhiko OHSAWA
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Publication number: 20150171680Abstract: A field element has permanent magnets embedded in a core and extending in the axial direction parallel to a rotation axis. Both a magnetic pole face of the permanent magnet close to an armature and a magnetic pole face away from the armature show arcs concaved toward an armature side. A radius of an arc shown by the magnetic pole face away from the armature is larger than a radius of an arc shown by the magnetic pole face close to the armature. Further, a focal point of the arc shown by the magnetic pole face away from the armature is further away from the permanent magnet than a focal point of the arc shown by the magnetic pole face close to the armature. Also, the focal points and the rotation axis are arranged on one straight line as viewed from the axial direction.Type: ApplicationFiled: June 12, 2013Publication date: June 18, 2015Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Nobuyuki Kifuji, Yoshinari Asano, Shintarou Araki
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Patent number: 8736135Abstract: Teeth are arranged annularly around a rotation axis. The yoke has through holes. The through holes open in a radial direction around the rotation axis and in an axial direction along the rotation axis. The teeth are inserted through the through holes. A metal plate is arranged to face the yoke in the axial direction. A reinforcing plate is fixed to the teeth.Type: GrantFiled: February 24, 2010Date of Patent: May 27, 2014Assignee: Daikin Industries, Ltd.Inventors: Yoshinari Asano, Nobuyuki Kifuji, Tomonori Kikuno, Shin Nakamasu, Ryuuji Yasumoto
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Patent number: 8616016Abstract: At a time of a heating high-load operation, a harmonic current is flown in an armature winding to induction-heat rare-earth magnets, thus reducing a residual magnetic flux density. Thereby, the number of rotations of a radial gap type motor is improved. The rare-earth magnets are provided near a cooling medium passage extending substantially in parallel with a flow line of a cooling medium, so that the cooling medium recovers heat of the heated rare-earth magnets. At a time of a cooling high-load operation, a greater number of rotations are obtained with respect to the same torque command value, by a field weakening control by means of a current-phase advance.Type: GrantFiled: June 8, 2009Date of Patent: December 31, 2013Assignee: Daikin Industries, Ltd.Inventors: Yoshinari Asano, Tomomi Sakamoto, Nobuyuki Kifuji, Hirofumi Higashi, Shintarou Araki
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Publication number: 20110316381Abstract: Teeth are arranged annularly around a rotation axis. The yoke has through holes. The through holes open in a radial direction around the rotation axis and in an axial direction along the rotation axis. The teeth are inserted through the through holes. A metal plate is arranged to face the yoke in the axial direction. A reinforcing plate is fixed to the teeth.Type: ApplicationFiled: February 24, 2010Publication date: December 29, 2011Inventors: Yoshinari Asano, Nobuyuki Kifuji, Tomonori Kikuno, Shin Nakamasu, Ryuuji Yasumoto
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Publication number: 20110083467Abstract: At a time of a heating high-load operation, a harmonic current is flown in an armature winding to induction-heat rare-earth magnets, thus reducing a residual magnetic flux density. Thereby, the number of rotations of a radial gap type motor is improved. The rare-earth magnets are provided near a cooling medium passage extending substantially in parallel with a flow line of a cooling medium, so that the cooling medium recovers heat of the heated rare-earth magnets. At a time of a cooling high-load operation, a greater number of rotations are obtained with respect to the same torque command value, by a field weakening control by means of a current-phase advance.Type: ApplicationFiled: June 8, 2009Publication date: April 14, 2011Inventors: Yoshinari Asano, Tomomi Sakamoto, Nobuyuki Kifuji, Hirofumi Higashi, Shintarou Araki
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Publication number: 20110084569Abstract: An armature core includes a back yoke and teeth. The teeth include a plurality of magnetic plates laminated along a lamination direction. The back yoke includes holes through which the teeth are inserted. The holes penetrate through a pair of surfaces of the back yoke. The back yoke and the plurality of magnetic plates are welded to each other at a point at which an edge of a boundary between the adjacent magnetic plates and a surface forming the hole are close to each other and any one of the pair of surfaces is exposed.Type: ApplicationFiled: June 5, 2009Publication date: April 14, 2011Inventors: Yoshinari Asano, Nobuyuki Kifuji, Tomonori Kikuno
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Publication number: 20100259125Abstract: An armature core is formed by laminating a plurality of first magnetic plates along a lamination direction. The armature core includes a prism portion and a first rectangular solid portion. The prism portion has a length measured in a first direction perpendicular to the lamination direction and a height measured in a second direction perpendicular to the lamination direction and the first direction. The length of the prism portion gradually increases along the lamination direction in at least part of the prism portion. The first rectangular solid portion is adjacent to the prism portion in the second direction. The first rectangular solid portion has a uniform length measured along the first direction. Preferably, a plurality of the armature cores are mounted on a yoke and have armature windings wound to form an armature of a rotary electric machine of a compressor.Type: ApplicationFiled: December 8, 2008Publication date: October 14, 2010Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Yoshinari Asano, Ryuuji Yasumoto, Nobuyuki Kifuji