Patents by Inventor Wakaki Miyaji
Wakaki Miyaji 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: 10584953Abstract: There are arranged a sensor magnet fixed to a rotary shaft and configured to generate a magnetic field for detecting a rotation angle, and a plurality of sensors arranged so as to be opposed to the sensor magnet and each configured to output a sine signal and a cosine signal in accordance with the magnetic field. First and second sensors are arranged on two radial lines different from each other, respectively, out of three radial lines dividing a circumference about the rotary shaft of the sensor magnet into six equal parts. An angle calculation unit is configured to carry out calculation so that 3n-th (n is a natural number) order harmonic components out of odd-order harmonic components of each of the sine signal and the cosine signal output by the first and second sensors cancel one another, to thereby calculate the rotation angle.Type: GrantFiled: November 26, 2015Date of Patent: March 10, 2020Assignee: Mitsubishi Electric CorporationInventors: Akira Furukawa, Wakaki Miyaji, Yu Kawano
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Patent number: 10491056Abstract: A stator in which stator coils are formed by a plurality of unit coils arranged so as to be shifted from each other in the circumferential direction and each having: a first slot-accommodated portion; a second slot-accommodated portion; a first terminal wire extending from the first slot-accommodated portion; a second terminal wire extending from the second slot-accommodated portion and shifted from the first terminal wire by one line of a conductive wire; a terminal-side coil end portion; and first and second anti-terminal-side coil end portions, wherein the first terminal wire and the second terminal wire of the respective different unit coils are joined with each other.Type: GrantFiled: August 19, 2015Date of Patent: November 26, 2019Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Naohiro Motoishi, Hiroyuki Akita, Koji Kawamura, Akira Hashimoto, Hironori Tsuiki, Wakaki Miyaji, Koji Tamura
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Publication number: 20180292197Abstract: There are arranged a sensor magnet fixed to a rotary shaft and configured to generate a magnetic field for detecting a rotation angle, and a plurality of sensors arranged so as to be opposed to the sensor magnet and each configured to output a sine signal and a cosine signal in accordance with the magnetic field. First and second sensors are arranged on two radial lines different from each other, respectively, out of three radial lines dividing a circumference about the rotary shaft of the sensor magnet into six equal parts. An angle calculation unit is configured to carry out calculation so that 3n-th (n is a natural number) order harmonic components out of odd-order harmonic components of each of the sine signal and the cosine signal output by the first and second sensors cancel one another, to thereby calculate the rotation angle.Type: ApplicationFiled: November 26, 2015Publication date: October 11, 2018Applicant: Mitsubishi Electric CorporationInventors: Akira FURUKAWA, Wakaki MIYAJI, Yu KAWANO
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Publication number: 20170201134Abstract: A stator in which stator coils are formed by a plurality of unit coils arranged so as to be shifted from each other in the circumferential direction and each having: a first slot-accommodated portion; a second slot-accommodated portion; a first terminal wire extending from the first slot-accommodated portion; a second terminal wire extending from the second slot-accommodated portion and shifted from the first terminal wire by one line of a conductive wire; a terminal-side coil end portion; and first and second anti-terminal-side coil end portions, wherein the first terminal wire and the second terminal wire of the respective different unit coils are joined with each other.Type: ApplicationFiled: August 19, 2015Publication date: July 13, 2017Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Naohiro MOTOISHI, Hiroyuki AKITA, Koji KAWAMURA, Akira HASHIMOTO, Hironori TSUIKI, Wakaki MIYAJI, Koji TAMURA
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Patent number: 9197150Abstract: A vehicular charging system includes: a generator which has a field coil and is mounted on a vehicle; a storage battery which stores power; a storage state detection sensor which detects a charge state; and a power generation driving torque control device which calculates an actual value and a target value of power generation driving torque of the generator, and controls the generator based on the calculated target value. The power generation driving torque control device controls the generator based on a first target value of the power generation driving torque when a running state of the vehicle moves into a deceleration mode, and decreases the power generation driving torque to control the generator based on a second target value of the power generation driving torque when a charge state of the storage battery reaches a reference value, the second target value being smaller than the first target value.Type: GrantFiled: April 10, 2014Date of Patent: November 24, 2015Assignee: Mitsubishi Electric CorporationInventors: Keisuke Katsurada, Wakaki Miyaji
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Publication number: 20150115903Abstract: A vehicular charging system includes: a generator which has a field coil and is mounted on a vehicle; a storage battery which stores power; a storage state detection sensor which detects a charge state; and a power generation driving torque control device which calculates an actual value and a target value of power generation driving torque of the generator, and controls the generator based on the calculated target value. The power generation driving torque control device controls the generator based on a first target value of the power generation driving torque when a running state of the vehicle moves into a deceleration mode, and decreases the power generation driving torque to control the generator based on a second target value of the power generation driving torque when a charge state of the storage battery reaches a reference value, the second target value being smaller than the first target value.Type: ApplicationFiled: April 10, 2014Publication date: April 30, 2015Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Keisuke KATSURADA, Wakaki MIYAJI
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Patent number: 8907542Abstract: An alternator of high quality and high performance includes a rotor, a stator core arranged so as to surround the rotor and having a plurality of axially extending slots arranged at a predetermined circumferential pitch, and a stator having a stator winding fitted into the slots. The stator core includes element iron cores of a hexahedral shape which are deformed to curve, with their adjacent end faces being abutted and bonded to each other, each of the element iron cores being composed of thin steel plates laminated and integrated with one another, with concave and convex portions formed on the thin steel plates being fitting with each other. The concave and convex portions are formed on a borderline between a compressive region of the stator core at an inner diameter side thereof and a tensile region of the stator core at an outer diameter side thereof.Type: GrantFiled: July 2, 2007Date of Patent: December 9, 2014Assignee: Mitsubishi Electric CorporationInventors: Wakaki Miyaji, Shinji Nishimura
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Patent number: 7646120Abstract: The automotive alternator according to the present invention includes: a case; a rotor that is disposed inside the case and that is fixed to a shaft; a stator that is disposed so as to surround the rotor and in which alternating current arises by means of a rotating magnetic field from the rotor; a rectifier that is disposed at an end portion of the shaft and that rectifies the alternating current that arises in the stator into direct current; and a noise preventing capacitor that is connected between a positive side and a negative side of the rectifier and that absorbs noise that arises during rectification into direct current by the rectifier, wherein a carbon resistor that suppresses current that flows to the noise preventing capacitor is connected to the noise preventing capacitor in series.Type: GrantFiled: July 24, 2006Date of Patent: January 12, 2010Assignee: Mitsubishi Electric CorporationInventors: Shinji Nishimura, Wakaki Miyaji
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Patent number: 7535137Abstract: An automotive alternator includes: a case; a shaft; a rotor that is fixed to the shaft; a stator that is fixed to an inner wall surface of the case; and a rectifier apparatus that is disposed inside the case and that is electrically connected to a stator coil of the stator so as to rectify alternating current generated in the stator coil into direct current, the rectifier apparatus having: a heatsink; diodes; and a circuit board that connects the diodes and the stator coil electrically and that is fixed to the case so as to be supported together with the heatsink by mount portions at three points, the alternator being characterized in that: vibration suppressing portions that are thicker than the mount portions and that suppress generation of vibrational modes in the circuit board among the mount portions are disposed on the mount portions.Type: GrantFiled: September 18, 2006Date of Patent: May 19, 2009Assignee: Mitsubishi Electric CorporationInventors: Hiroya Ikuta, Wakaki Miyaji
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Patent number: 7501727Abstract: An alternator includes: a rotor fixed to a shaft so as to rotate with the shaft; a stator disposed so as to surround the rotor, an alternating current being generated in the stator by a rotating magnetic field from the rotor; and a voltage control apparatus for adjusting magnitude of an output voltage of the alternating current generated in the stator, wherein: the voltage control apparatus includes: a grounded, electrically-conductive heat sink; and a control main body fixed to the heat sink, the control main body including an integrated circuit chip on which a circuit for controlling the output voltage is formed. As a result, parts are reduced in number, reducing manufacturing costs.Type: GrantFiled: August 26, 2004Date of Patent: March 10, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Wakaki Miyaji, Akinori Nishizawa, Kyoko Higashino
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Patent number: 7498713Abstract: A stator includes: an annular stator core in which a plurality of slots opening radially inward are formed circumferentially; and a stator winding installed in the stator core. A sheet-shaped varnish supporting member is disposed so as to be placed in close contact with a radially-outermost surface of a coil end group of the stator winding around an entire circumference, and a varnish is applied to the coil end group from radially inside.Type: GrantFiled: January 26, 2006Date of Patent: March 3, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kyoko Higashino, Wakaki Miyaji
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Patent number: 7466048Abstract: First and second lead portions of an a-phase winding, a b-phase winding and a c-phase winding are each led out from a rear-end coil end group, and subsequently led around circumferentially along an apex portion of the rear-end coil end group so as to be separated from the apex portion. In addition, the first lead portions and the second lead portions are bent axially so as to contact each other closely and are joined together. The first lead portions are fastened by ties in a vicinity of the bent portion extending to the joined portion of the first lead portion, and the second lead portions are fastened by ties in a vicinity of a portion at which the first lead portion is led out from the rear-end coil end group.Type: GrantFiled: February 14, 2006Date of Patent: December 16, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shoichiro Nishitani, Wakaki Miyaji
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Publication number: 20080179985Abstract: An alternator of high quality and high performance includes a rotor, a stator core arranged so as to surround the rotor and having a plurality of axially extending slots arranged at a predetermined circumferential pitch, and a stator having a stator winding fitted into the slots. The stator core includes element iron cores of a hexahedral shape which are deformed to curve, with their adjacent end faces being abutted and bonded to each other, each of the element iron cores being composed of thin steel plates laminated and integrated with one another, with concave and convex portions formed on the thin steel plates being fitting with each other. The concave and convex portions are formed on a borderline between a compressive region of the stator core at an inner diameter side thereof and a tensile region of the stator core at an outer diameter side thereof.Type: ApplicationFiled: July 2, 2007Publication date: July 31, 2008Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Wakaki Miyaji, Shinji Nishimura
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Patent number: 7391136Abstract: An in-slot conductor part of a stator winding of a rotary electric machine has multiple in-slot conductors disposed in multiple slots. In each of the multiple slots a plurality of the in-slot conductors are disposed in a line in the depth direction of the slot, in the coil end parts each of the multiple coil end conductors has a root part led out through a slot opening at one of the end faces of a stator core in substantially the same direction as the extension direction of the in-slot conductors and a connecting part disposed farther from the end face of the stator core than this root part and bent so as to form a bridge between two root parts.Type: GrantFiled: March 25, 2004Date of Patent: June 24, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshiaki Kashihara, Wakaki Miyaji
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Patent number: 7345387Abstract: An automotive alternator in which a fan rotating together with a rotor to direct air from a suction aperture into a case, blow the air centrifugally, and discharge the air externally through a discharge aperture has a blade including an interposed portion extending axially from an end surface of a pole core between an adjacent pair of claw-shaped magnetic poles. For this reason, cooling of a rotor coil and a stator coil is improved by improving capacity of the fan in a limited space, thereby enabling output to be improved.Type: GrantFiled: August 9, 2004Date of Patent: March 18, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroyuki Akita, Keiichiro Oka, Wakaki Miyaji, Toshiaki Kashihara
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Patent number: D577670Type: GrantFiled: November 30, 2007Date of Patent: September 30, 2008Assignee: Mitsubishi Electric CorporationInventors: Atsushi Oohashi, Shogo Okamoto, Wakaki Miyaji
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Patent number: D596120Type: GrantFiled: September 4, 2007Date of Patent: July 14, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Wakaki Miyaji, Kenji Nakao, Shogo Okamoto
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Patent number: D596121Type: GrantFiled: September 4, 2007Date of Patent: July 14, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shogo Okamoto, Kenji Nakao, Wakaki Miyaji
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Patent number: D602867Type: GrantFiled: August 16, 2007Date of Patent: October 27, 2009Assignee: Mitsubishi Electric CorporationInventors: Wakaki Miyaji, Kenji Nakao, Atsushi Oohashi
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Patent number: D621416Type: GrantFiled: September 26, 2007Date of Patent: August 10, 2010Assignee: Mitsubishi Electric CorporationInventors: Wakaki Miyaji, Kenji Nakao, Yoshiro Imazawa