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).

  • Publication number: 20230412030
    Abstract: 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: Application
    Filed: October 28, 2022
    Publication date: December 21, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Naohiro MOTOISHI, Fumitaka TOTSUKA, Yosuke SUGINO
  • Publication number: 20230318387
    Abstract: 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: Application
    Filed: August 17, 2020
    Publication date: October 5, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Naohiro MOTOISHI, Takahisa KAWAGUCHI, Kentaro URIMOTO
  • Publication number: 20230049080
    Abstract: 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: Application
    Filed: March 27, 2020
    Publication date: February 16, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Naohiro MOTOISHI, Takahisa KAWAGUCHI, Kentaro URIMOTO, Akira KIMISHIMA, Satoshi IOHARA, Yoshikuni TOMIOKA
  • Patent number: 11095173
    Abstract: 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: Grant
    Filed: February 22, 2017
    Date of Patent: August 17, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Koji Kawamura, Akira Hashimoto, Hiroyuki Akita, Sachiko Kawasaki, Naohiro Motoishi, Takatoshi Masuda
  • Patent number: 10886823
    Abstract: 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: Grant
    Filed: March 3, 2017
    Date of Patent: January 5, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Koji Kawamura, Naohiro Motoishi, Takatoshi Masuda
  • Patent number: 10756588
    Abstract: 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: Grant
    Filed: June 5, 2017
    Date of Patent: August 25, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Koji Kawamura, Naohiro Motoishi, Takatoshi Masuda
  • Patent number: 10627258
    Abstract: 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: Grant
    Filed: August 21, 2014
    Date of Patent: April 21, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yusuke Morita, Atsushi Yamamoto, Masahiko Fujita, Naohiro Motoishi, Kazumasa Ito, Masatsugu Nakano
  • Patent number: 10491056
    Abstract: 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: Grant
    Filed: August 19, 2015
    Date of Patent: November 26, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Naohiro Motoishi, Hiroyuki Akita, Koji Kawamura, Akira Hashimoto, Hironori Tsuiki, Wakaki Miyaji, Koji Tamura
  • Publication number: 20190260251
    Abstract: 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: Application
    Filed: June 5, 2017
    Publication date: August 22, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Koji KAWAMURA, Naohiro MOTOISHI, Takatoshi MASUDA
  • Patent number: 10254133
    Abstract: 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: Grant
    Filed: December 9, 2013
    Date of Patent: April 9, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Ryuichi Takiguchi, Morishige Minobe, Satoru Nakada, Shuhei Niikura, Naohiro Motoishi, Yusuke Morita, Takanori Komatsu
  • Publication number: 20190097502
    Abstract: 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: Application
    Filed: March 3, 2017
    Publication date: March 28, 2019
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Koji KAWAMURA, Naohiro MOTOISHI, Takatoshi MASUDA
  • Publication number: 20190036390
    Abstract: 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: Application
    Filed: February 22, 2017
    Publication date: January 31, 2019
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Koji Kawamura, Akira Hashimoto, Hiroyuki Akita, Sachiko Kawasaki, Naohiro Motoishi, Takatoshi Masuda
  • Publication number: 20180331605
    Abstract: 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: Application
    Filed: May 11, 2016
    Publication date: November 15, 2018
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Naohiro MOTOISHI, Koji KAWAMURA, Takatoshi MASUDA, Yuji TAKIZAWA
  • Publication number: 20170199057
    Abstract: 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: Application
    Filed: August 21, 2014
    Publication date: July 13, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yusuke MORITA, Atsushi YAMAMOTO, Masahiko FUJITA, Naohiro MOTOISHI, Kazumasa ITO, Masatsugu NAKANO
  • Publication number: 20170201134
    Abstract: 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: Application
    Filed: August 19, 2015
    Publication date: July 13, 2017
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Naohiro MOTOISHI, Hiroyuki AKITA, Koji KAWAMURA, Akira HASHIMOTO, Hironori TSUIKI, Wakaki MIYAJI, Koji TAMURA
  • Publication number: 20160265944
    Abstract: 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: Application
    Filed: December 9, 2013
    Publication date: September 15, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Ryuichi TAKIGUCHI, Morishige MINOBE, Satoru NAKADA, Shuhei NIIKURA, Naohiro MOTOISHI, Yusuke MORITA, Takanori KOMATSU
  • Patent number: 9413209
    Abstract: 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: Grant
    Filed: February 8, 2013
    Date of Patent: August 9, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Naohiro Motoishi, Masahiko Fujita, Yoshinobu Utsumi
  • Publication number: 20140070643
    Abstract: 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: Application
    Filed: February 8, 2013
    Publication date: March 13, 2014
    Inventors: Naohiro MOTOISHI, Masahiko FUJITA, Yoshinobu UTSUMI