Patents by Inventor Kenji Maekawa
Kenji Maekawa 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: 12165788Abstract: In the insulation sheet, an insulation resin layer made of a thermosetting resin composition in an uncured or semi-cured state is formed on one or each of both surfaces of the base material. The thermosetting resin composition contains: a thermosetting resin (A) that is in solid form at 25° C.; a thermosetting resin (B) that is in liquid form at 25° C.; a latent curing agent that is unreactive at 60° C. or lower; and an inorganic filler having a maximum particle diameter smaller than a film thickness of the insulation resin layer and having an average particle diameter smaller than 0.5 times the film thickness. The insulation resin layer of the insulation sheet is efficiently compressed into a predetermined thickness by pressure application at normal temperature and permeates a gap between a stator core and a stator coil by heating during curing treatment, whereby both members can be insulated and fixed.Type: GrantFiled: October 28, 2020Date of Patent: December 10, 2024Assignee: Mitsubishi Electric CorporationInventors: Shiori Natori, Naoki Yasuda, Kazuya Hasegawa, Kenji Maekawa, Yasuhiro Hayasaka
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Patent number: 11569697Abstract: An annular stator core in which, out of slots arrayed in a circumferential direction and extending in a radial direction, q slots are formed per pole and per phase; and stator windings, for respective phases, attached to the stator core. For each stator winding, q*n unit coils obtained by winding wire conductors at regular intervals into concentric winding forms are used to obtain n coils in each of which the q unit coils wound in a same direction are connected so as to be shifted from each other in the circumferential direction, and the stator winding is composed of two coil groups each obtained by joining the n/2 coils together. The two coil groups are connected in parallel to each other between power feed portions and neutral points, and two coils that are connected to the power feed portions are disposed so as to share the slot.Type: GrantFiled: October 19, 2020Date of Patent: January 31, 2023Assignee: Mitsubishi Electric CorporationInventors: Naohiko Ayukawa, Tatsuro Hino, Kohei Egashira, Kazuya Hasegawa, Yasuhiro Hayasaka, Kenji Maekawa
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Publication number: 20210183535Abstract: In the insulation sheet, an insulation resin layer made of a thermosetting resin composition in an uncured or semi-cured state is formed on one or each of both surfaces of the base material. The thermosetting resin composition contains: a thermosetting resin (A) that is in solid form at 25° C.; a thermosetting resin (B) that is in liquid form at 25° C.; a latent curing agent that is unreactive at 60° C. or lower; and an inorganic filler having a maximum particle diameter smaller than a film thickness of the insulation resin layer and having an average particle diameter smaller than 0.5 times the film thickness. The insulation resin layer of the insulation sheet is efficiently compressed into a predetermined thickness by pressure application at normal temperature and permeates a gap between a stator core and a stator coil by heating during curing treatment, whereby both members can be insulated and fixed.Type: ApplicationFiled: October 28, 2020Publication date: June 17, 2021Applicant: Mitsubishi Electric CorporationInventors: Shiori NATORI, Naoki YASUDA, Kazuya HASEGAWA, Kenji MAEKAWA, Yasuhiro HAYASAKA
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Patent number: 11038395Abstract: A winding-start receiving groove in which a winding-start lead wire of a field coil is received is formed in an inner surface of a flange of an insulation bobbin. A holder is disposed on the flange and located on a radially outer side of the winding-start receiving groove. The holder is formed with a holder groove located on an extension line of the winding-start receiving groove and extending at an angle relative to a radial direction of the insulation bobbin. The winding-start lead wire of the field coil is received in the winding-start receiving groove and the holder groove and held by the holder. This makes it possible to obtain a rotor of a rotary electrical machine with a simplified configuration at low cost not only to improve winding workability but also to enhance electrical reliability and durability.Type: GrantFiled: May 31, 2016Date of Patent: June 15, 2021Assignee: Mitsubishi Electric CorporationInventors: Shintaro Shimizu, Kenji Maekawa, Toru Ishikawa, Yoshiro Imazawa
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Publication number: 20210175758Abstract: An annular stator core in which, out of slots arrayed in a circumferential direction and extending in a radial direction, q slots are formed per pole and per phase; and stator windings, for respective phases, attached to the stator core. For each stator winding, q*n unit coils obtained by winding wire conductors at regular intervals into concentric winding forms are used to obtain n coils in each of which the q unit coils wound in a same direction are connected so as to be shifted from each other in the circumferential direction, and the stator winding is composed of two coil groups each obtained by joining the n/2 coils together. The two coil groups are connected in parallel to each other between power feed portions and neutral points, and two coils that are connected to the power feed portions are disposed so as to share the slot.Type: ApplicationFiled: October 19, 2020Publication date: June 10, 2021Applicant: Mitsubishi Electric CorporationInventors: Naohiko Ayukawa, Tatsuro Hino, Kohei Egashira, Kazuya Hasegawa, Yasuhiro Hayasaka, Kenji Maekawa
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Patent number: 10848028Abstract: A detachment prevention portion extending in a circumferential direction of a flange portion of a bobbin from a neck portion of a locking portion provided so as to extend radially outward from the flange portion is formed such that a length by which the detachment prevention portion extends to one side in the circumferential direction is longer than a length by which the detachment prevention portion extends to another side in the circumferential direction. Accordingly, interference between cover portions and a field coil winding or between the cover portions and a winding jig for the winding during operation of winding a lead wire of the winding can be inhibited while electric insulation between a field coil and claw-shaped magnetic poles is ensured.Type: GrantFiled: November 6, 2015Date of Patent: November 24, 2020Assignee: Mitsubishi Electric CorporationInventors: Yoshiro Imazawa, Shintaro Shimizu, Kenji Maekawa, Yoshihiro Shinosaka
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Patent number: 10581289Abstract: This rotating electric machine rotor has a rotor coil composed of; a lower coil field wound around the outer circumference of a winding drum portion of a bobbin; and a mountain-wound coil field wound around the outer circumference of the lower coil field. A cross point in the mountain-wound coil field and a cross point in the lower coil field are shifted from each other in the circumferential direction. Thus, it becomes possible to shift the cross point positions without changing the thickness of the winding drum portion of the bobbin and without using a tape or the like.Type: GrantFiled: August 26, 2014Date of Patent: March 3, 2020Assignee: Mitsubishi Electric CorporationInventors: Masayuki Sakaguchi, Mitsuyasu Okamoto, Kenji Maekawa
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Publication number: 20190207463Abstract: A winding-start receiving groove in which a winding-start lead wire of a field coil is received is formed in an inner surface of a flange of an insulation bobbin. A holder is disposed on the flange and located on a radially outer side of the winding-start receiving groove. The holder is formed with a holder groove located on an extension line of the winding-start receiving groove and extending at an angle relative to a radial direction of the insulation bobbin. The winding-start lead wire of the field coil is received in the winding-start receiving groove and the holder groove and held by the holder. This makes it possible to obtain a rotor of a rotary electrical machine with a simplified configuration at low cost not only to improve winding workability but also to enhance electrical reliability and durability.Type: ApplicationFiled: May 31, 2016Publication date: July 4, 2019Applicant: Mitsubishi Electric CorporationInventors: Shintaro SHIMIZU, Kenji MAEKAWA, Toru ISHIKAWA, Yoshiro IMAZAWA
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Publication number: 20180248436Abstract: A detachment prevention portion extending in a circumferential direction of a flange portion of a bobbin from a neck portion of a locking portion provided so as to extend radially outward from the flange portion is formed such that a length by which the detachment prevention portion extends to one side in the circumferential direction is longer than a length by which the detachment prevention portion extends to another side in the circumferential direction. Accordingly, interference between cover portions and a field coil winding or between the cover portions and a winding jig for the winding during operation of winding a lead wire of the winding can be inhibited while electric insulation between a field coil and claw-shaped magnetic poles is ensured.Type: ApplicationFiled: November 6, 2015Publication date: August 30, 2018Applicant: Mitsubishi Electric CorporationInventors: Yoshiro IMAZAWA, Shintaro SHIMIZU, Kenji MAEKAWA, Yoshihiro SHINOSAKA
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Publication number: 20170163113Abstract: This rotating electric machine rotor has a rotor coil composed of; a lower coil field wound around the outer circumference of a winding drum portion of a bobbin; and a mountain-wound coil field wound around the outer circumference of the lower coil field. A cross point in the mountain-wound coil field and a cross point in the lower coil field are shifted from each other in the circumferential direction. Thus, it becomes possible to shift the cross point positions without changing the thickness of the winding drum portion of the bobbin and without using a tape or the like.Type: ApplicationFiled: August 26, 2014Publication date: June 8, 2017Applicant: Mitsubishi Electric CorporationInventors: Masayuki SAKAGUCHI, Mitsuyasu OKAMOTO, Kenji MAEKAWA
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Publication number: 20050216093Abstract: To provide a surface modified implant made with titanium or a titanium alloy in which a bone bonding can be made easily and certainly as compared with conventional ones and treating method thereof, the surface of the implant made with titanium or the titanium alloy is treated with polyphosphoric acid and basic fibroblast growth factor (bFGF), and the method comprises treating with a polyphosphoric acid solution having a concentration of 0.05 to 70% by weight and with a basic fibroblast growth factor (bFGF) solution having a concentration of 1 to 500 ng/ml, or treating with a mixed solution having the concentration of the polyphosphoric acid of 0.05 to 70% by weight and the concentration of the basic fibroblast growth factor (bFGF) of 1 to 500 ng/ml.Type: ApplicationFiled: March 25, 2005Publication date: September 29, 2005Applicant: GC CorporationInventors: Takuo Kuboki, Kenji Maekawa, Yasuhiro Yoshida, Atsushi Mine, Takuo Fujisawa, Kazuomi Suzuki, Bart Van Meerbeek, Tadashi Kaneko
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Patent number: 6337730Abstract: According to this liquid crystal cell, a vacuum to be established between two electrode substrates as a result of the volume shrinkage of a liquid crystal having a high viscosity at the room temperature can be damped by communicating between two of a plurality of filling portions formed between two electrode substrates by a plurality of barrier walls through the intervening barrier walls. An anti-ferroelectric liquid crystal (AFLC) is used as the liquid crystal. The liquid crystal cell has a lower electrode substrate and an upper electrode substrate, between which a smectic liquid crystal is disposed together with a plurality of barrier walls on the inner side of a band seal. Each barrier wall has through holes to communicate between the two filling portions located on the two sides of the barrier walls.Type: GrantFiled: June 1, 1999Date of Patent: January 8, 2002Assignee: Denso CorporationInventors: Masaaki Ozaki, Koichi Miyashita, Kenji Maekawa, Takahisa Kaneko, Naoki Matsumoto, Kazuhiro Inoguchi
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Patent number: 5889916Abstract: A video data recording apparatus for recording video data using a tape-like recording medium accommodated in a cassette provided with a semiconductor memory by which it is possible to suitably determine the cuts and make effective use of the semiconductor memory to enable efficient editing. The user can mark the recorded video data with the desired starting position and ending position of the video data. The marked cuts are used to extract the index picture and, at the same time, the recording positions of the cuts and an index picture on the tape recording medium are recorded in the semiconductor memory.Type: GrantFiled: January 17, 1997Date of Patent: March 30, 1999Assignee: Sony CorporationInventors: Katsumi Kimura, Kenji Maekawa, Shigeru Kato, Masataka Mukai, Masao Naito, Kiyoshi Inoue, Takeo Nishijima
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Patent number: 4605813Abstract: A flexible amorphous silicon solar battery comprising a metal foil as the substrate thereof, an insulating layer integrally formed on the metal foil, and at least one amorphous silicon photoelectric conversion portion formed on the insulating layer. The amorphous silicon photoelectric conversion portion thereof comprises an a-Si thin film having a potential barrier therein, an upper electrode and a lower electrode. The a-Si thin film is sandwiched between the upper and lower electrodes. The upper electrodes may be formed of a transparent conductive film. The transparent conductive film may be also in two layers composed of a relatively thin tin dioxide film and a relatively thick ITO film thereby to lower the resistance of transparent conductive film and to obtain a superior a-Si thin film having no impurity particles therein. A plurality of a-Si photoelectric conversion portions may be formed on the same substrate, and are connected in series with one another, to increase the output voltage thereof.Type: GrantFiled: July 11, 1985Date of Patent: August 12, 1986Assignee: Nippondenso Co., Ltd.Inventors: Yukihisa Takeuchi, Masaaki Mori, Kenji Maekawa, Toshiaki Nishizawa