Patents by Inventor Naohiro MOTOISHI
Naohiro MOTOISHI 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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Publication number: 20230412030Abstract: An insulating bobbin to be mounted on a stator core has a tooth-endface facing portion that faces an endface portion, in an axial direction, of the tooth portion and a tooth-side-surface facing portion that faces a tooth side surface portion, in a circumferential direction, of the tooth portion; the tooth-side-surface facing portion has a first abutting area that abuts on the tooth side surface portion, a second abutting area that abuts on the tooth side surface portion at a more outer side in a radial direction than the first abutting area abuts thereon, and a middle inner wall surface portion that is situated between the first abutting area and the second abutting area and faces the tooth side surface portion via a space.Type: ApplicationFiled: October 28, 2022Publication date: December 21, 2023Applicant: Mitsubishi Electric CorporationInventors: Naohiro MOTOISHI, Fumitaka TOTSUKA, Yosuke SUGINO
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Publication number: 20230318387Abstract: The objective of the present disclosure is to realize downsizing of the bus-bar holder, and then to downsize an electric rotating machine apparatus and an electric power steering apparatus. In a first protruding portion of the bus-bar holder, there are provided a columnar portion, two or more first ribs that are provided on an outer circumferential surface of the columnar portion in such a way as to be parallel with a center axis of the columnar portion and in such a way as to be spaced apart from one another, and two or more second ribs; the first rib makes contact with an inner circumference surface of a first through hole of the control circuit board; the second rib makes contact with an inner circumference surface of a second through hole of the bus bar.Type: ApplicationFiled: August 17, 2020Publication date: October 5, 2023Applicant: Mitsubishi Electric CorporationInventors: Naohiro MOTOISHI, Takahisa KAWAGUCHI, Kentaro URIMOTO
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Publication number: 20230049080Abstract: In an electric rotating machine apparatus according to the present disclosure, noise-removal capability is secured by adopting a structure in which an external terminal is connected with a protruding portion, of a control circuit board in a control unit, that protrudes from a through hole of an electromagnetic shield and in which a filter unit is provided. Because a conventional dedicated wiring board for mounting the filter unit thereon is not required, the foregoing structure can contribute to downsizing and cost reduction. In addition, the foregoing structure can contribute to downsizing and cost reduction of an electric power steering apparatus equipped with the electric rotating machine apparatus according to the present disclosure.Type: ApplicationFiled: March 27, 2020Publication date: February 16, 2023Applicant: Mitsubishi Electric CorporationInventors: Naohiro MOTOISHI, Takahisa KAWAGUCHI, Kentaro URIMOTO, Akira KIMISHIMA, Satoshi IOHARA, Yoshikuni TOMIOKA
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Patent number: 11095173Abstract: A stator core of a rotary electric machine includes: an outer core that is an annular back yoke portion; and an inner core in which a plurality of teeth are radially arranged and inner side end portions of the teeth adjacent to each other in a circumferential direction are connected to each other in the circumferential direction by connection portions and which is fitted to an inner side of the outer core, each connection portion has a hole penetrating in an axial direction, each connection portion is split into a plurality of sections by the hole, a width in a radial direction of the one connection portion at a portion of the connection portion that has a smallest width in the radial direction is equal to or greater than ¼ and less than ½ of a sheet thickness of each of sheets.Type: GrantFiled: February 22, 2017Date of Patent: August 17, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Koji Kawamura, Akira Hashimoto, Hiroyuki Akita, Sachiko Kawasaki, Naohiro Motoishi, Takatoshi Masuda
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Patent number: 10886823Abstract: A first terminal portion of a first terminal wire of one divisional coil, and a second terminal portion of a second terminal wire of another divisional coil, extend from the entrance side or the bottom side of a slot so as to be directed upward in the axial direction and arranged side by side in the radial direction of a stator on the upper side in the axial direction of a stator core. The end of the first terminal portion and the end of the second terminal portion are joined to each other by a joining part. At least one of the first terminal portion and the second terminal portion leading to the joining part has an engagement portion for positioning the first terminal portion and the second terminal portion with each other in the circumferential direction and the radial direction.Type: GrantFiled: March 3, 2017Date of Patent: January 5, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Koji Kawamura, Naohiro Motoishi, Takatoshi Masuda
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Patent number: 10756588Abstract: A stator coil is formed by: combining a first division coil which is a coil with two or more turns and disposed in slots and in which a first terminal end portion and a second terminal end portion are formed, a second division coil which is a coil with a number of winding turns decreased from that of the first division coil by 0.5 turns and disposed in the slots and in which a first terminal end portion is formed, and a joint coil which is a coil with one turn and disposed in the slots and in which a first terminal end portion and a second terminal end portion are formed so as to be extended to the outside; and selectively joining the terminal end portions of these coils.Type: GrantFiled: June 5, 2017Date of Patent: August 25, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Koji Kawamura, Naohiro Motoishi, Takatoshi Masuda
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Patent number: 10627258Abstract: In a related-art resolver, a front and a back of a stator core cannot be distinguished, and it is difficult to mass-produce the resolver while matching directions of shear drops and burrs. Thus, assembly accuracy of the resolver is degraded. Further, productivity and assembling ability are degraded because electromagnetic steel sheets are laminated by rotary lamination. The present invention provides a resolver including: a resolver stator including: a stator core formed of electromagnetic steel sheets, which have teeth, and are laminated without rotary lamination; a one-phase excitation winding; and two-phase output windings; and a resolver rotor arranged to be opposed to the resolver stator, in which the stator core has marks which enable distinction of a rolling direction of the stator core and distinction of a front and a back of the stator core.Type: GrantFiled: August 21, 2014Date of Patent: April 21, 2020Assignee: Mitsubishi Electric CorporationInventors: Yusuke Morita, Atsushi Yamamoto, Masahiko Fujita, Naohiro Motoishi, Kazumasa Ito, Masatsugu Nakano
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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: 20190260251Abstract: A stator coil is formed by: combining a first division coil which is a coil with two or more turns and disposed in slots and in which a first terminal end portion and a second terminal end portion are formed, a second division coil which is a coil with a number of winding turns decreased from that of the first division coil by 0.5 turns and disposed in the slots and in which a first terminal end portion is formed, and a joint coil which is a coil with one turn and disposed in the slots and in which a first terminal end portion and a second terminal end portion are formed so as to be extended to the outside; and selectively joining the terminal end portions of these coils.Type: ApplicationFiled: June 5, 2017Publication date: August 22, 2019Applicant: Mitsubishi Electric CorporationInventors: Koji KAWAMURA, Naohiro MOTOISHI, Takatoshi MASUDA
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Patent number: 10254133Abstract: An excitation winding is wound around each tooth of a detecting stator core. First output winding and second output winding are wound around mutually different teeth while avoiding winding of the output windings with the same phase around two teeth adjacent to each other in a circumferential direction. When the number of pole pairs of the excitation winding is M that is an integer equal to or greater than 1 and the number of salient poles of a detecting rotor is N that is an integer equal to or greater than 1, a spatial distribution of the number of turns in each of the first and second output winding is obtained by a function represented by a sine wave of a spatial order |M±N|. An error spatial order ? represented by |M?|M±N? and an error spatial order ? represented by |??M| are values other than 1 and 2.Type: GrantFiled: December 9, 2013Date of Patent: April 9, 2019Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Ryuichi Takiguchi, Morishige Minobe, Satoru Nakada, Shuhei Niikura, Naohiro Motoishi, Yusuke Morita, Takanori Komatsu
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Publication number: 20190097502Abstract: A first terminal portion of a first terminal wire of one divisional coil, and a second terminal portion of a second terminal wire of another divisional coil, extend from the entrance side or the bottom side of a slot so as to be directed upward in the axial direction and arranged side by side in the radial direction of a stator on the upper side in the axial direction of a stator core. The end of the first terminal portion and the end of the second terminal portion are joined to each other by a joining part. At least one of the first terminal portion and the second terminal portion leading to the joining part has an engagement portion for positioning the first terminal portion and the second terminal portion with each other in the circumferential direction and the radial direction.Type: ApplicationFiled: March 3, 2017Publication date: March 28, 2019Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Koji KAWAMURA, Naohiro MOTOISHI, Takatoshi MASUDA
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Publication number: 20190036390Abstract: A stator core of a rotary electric machine includes: an outer core that is an annular back yoke portion; and an inner core in which a plurality of teeth are radially arranged and inner side end portions of the teeth adjacent to each other in a circumferential direction are connected to each other in the circumferential direction by connection portions and which is fitted to an inner side of the outer core, each connection portion has a hole penetrating in an axial direction, each connection portion is split into a plurality of sections by the hole, a width in a radial direction of the one connection portion at a portion of the connection portion that has a smallest width in the radial direction is equal to or greater than ¼ and less than ½ of a sheet thickness of each of sheets.Type: ApplicationFiled: February 22, 2017Publication date: January 31, 2019Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Koji Kawamura, Akira Hashimoto, Hiroyuki Akita, Sachiko Kawasaki, Naohiro Motoishi, Takatoshi Masuda
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Publication number: 20180331605Abstract: Each pair of the forming die and the clamping die holding a straight portion of a plane-bent intermediate coil from both sides in the circumferential direction have equal widths in the radial direction of the coil forming device, and the forming dies and the clamping dies holding a plurality of the straight portions disposed from an inner peripheral side of the coil forming device toward an outer peripheral side of the coil forming device are disposed alternately in the circumferential direction with the straight portions interposed therebetween.Type: ApplicationFiled: May 11, 2016Publication date: November 15, 2018Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Naohiro MOTOISHI, Koji KAWAMURA, Takatoshi MASUDA, Yuji TAKIZAWA
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Publication number: 20170199057Abstract: In a related-art resolver, a front and a back of a stator core cannot be distinguished, and it is difficult to mass-produce the resolver while matching directions of shear drops and burrs. Thus, assembly accuracy of the resolver is degraded. Further, productivity and assembling ability are degraded because electromagnetic steel sheets are laminated by rotary lamination. The present invention provides a resolver including: a resolver stator including: a stator core formed of electromagnetic steel sheets, which have teeth, and are laminated without rotary lamination; a one-phase excitation winding; and two-phase output windings; and a resolver rotor arranged to be opposed to the resolver stator, in which the stator core has marks which enable distinction of a rolling direction of the stator core and distinction of a front and a back of the stator core.Type: ApplicationFiled: August 21, 2014Publication date: July 13, 2017Applicant: Mitsubishi Electric CorporationInventors: Yusuke MORITA, Atsushi YAMAMOTO, Masahiko FUJITA, Naohiro MOTOISHI, Kazumasa ITO, Masatsugu NAKANO
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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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Publication number: 20160265944Abstract: An excitation winding is wound around each tooth of a detecting stator core. First output winding and second output winding are wound around mutually different teeth while avoiding winding of the output windings with the same phase around two teeth adjacent to each other in a circumferential direction. When the number of pole pairs of the excitation winding is M that is an integer equal to or greater than 1 and the number of salient poles of a detecting rotor is N that is an integer equal to or greater than 1, a spatial distribution of the number of turns in each of the first and second output winding is obtained by a function represented by a sine wave of a spatial order |M±N|. An error spatial order ? represented by |M?|M±N? and an error spatial order ? represented by |??M| are values other than 1 and 2.Type: ApplicationFiled: December 9, 2013Publication date: September 15, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Ryuichi TAKIGUCHI, Morishige MINOBE, Satoru NAKADA, Shuhei NIIKURA, Naohiro MOTOISHI, Yusuke MORITA, Takanori KOMATSU
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Patent number: 9413209Abstract: A rotating electric machine including: a bracket holding a rotor and a stator of a motor; a heat sink provided fixedly to the bracket on an outside of the bracket; a resolver disposed between the heat sink and the motor; a stator circuit portion and a field circuit portion disposed to the heat sink on a side opposite to the resolver; and a control board supported on an insert case attached to the heat sink and electrically connected to the stator circuit portion and the field circuit portion. A resolver input-output terminal is electrically connected to the control board by passing through an insertion hole provided to the heat sink. The rotating electric machine configured in this manner is compact and inexpensive with an excellent heat-releasing performance and a capability of reducing man-hours required for assembly and components required for connection.Type: GrantFiled: February 8, 2013Date of Patent: August 9, 2016Assignee: Mitsubishi Electric CorporationInventors: Naohiro Motoishi, Masahiko Fujita, Yoshinobu Utsumi
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Publication number: 20140070643Abstract: A rotating electric machine including: a bracket holding a rotor and a stator of a motor; a heat sink provided fixedly to the bracket on an outside of the bracket; a resolver disposed between the heat sink and the motor; a stator circuit portion and a field circuit portion disposed to the heat sink on a side opposite to the resolver; and a control board supported on an insert case attached to the heat sink and electrically connected to the stator circuit portion and the field circuit portion. A resolver input-output terminal is electrically connected to the control board by passing through an insertion hole provided to the heat sink. The rotating electric machine configured in this manner is compact and inexpensive with an excellent heat-releasing performance and a capability of reducing man-hours required for assembly and components required for connection.Type: ApplicationFiled: February 8, 2013Publication date: March 13, 2014Inventors: Naohiro MOTOISHI, Masahiko FUJITA, Yoshinobu UTSUMI