Patents by Inventor Tatsuhiko Mizutani
Tatsuhiko Mizutani 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: 12166386Abstract: A stator includes a stator core, three-phase coils, three external terminals, and three busbars. Each of the three-phase coils has a first coil end protruding from the radially outermost side of a slot to a first side in the axial direction of the stator core. Each of the three bus bars includes a busbar body portion extending in a circumferential direction of the stator core, a busbar connection portion extending toward the first side in the axial direction, and an external terminal connection portion extending outward in the radial direction and connected to the external terminal. The first coil end extends in the radial direction through between the busbar body portion and the stator core in the axial direction, extends toward the first side in the axial direction on a radially outer side of the busbar body portion, and has a tip connected to the busbar connection portion from the radially outer side.Type: GrantFiled: June 1, 2020Date of Patent: December 10, 2024Assignee: NIDEC CORPORATIONInventors: Hibiki Takada, Takahiro Hiwa, Hisashi Fujihara, Tatsuhiko Mizutani
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Patent number: 11750072Abstract: A motor assembly includes a motor including a rotor including a shaft rotatable about a rotation axis and a stator surrounding the rotor from radially outside, a housing that accommodates the motor, a bearing that is fixed to the housing and rotatably supports the shaft, a resolver including a resolver rotor fixed to the shaft and a resolver stator fixed to the housing, and a contact that has conductivity, is fixed to the housing, and is in contact with a contacted portion at an end portion on one axial side of the shaft. The housing includes an accommodation space in which the contacted portion of the shaft is accommodated. The contact and the resolver are side by side in a direction along a rotation axis in the accommodation space.Type: GrantFiled: September 22, 2021Date of Patent: September 5, 2023Assignee: NIDEC CORPORATIONInventors: Takayuki Makino, Tatsuhiko Mizutani, Masato Aono
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Publication number: 20220320937Abstract: A busbar unit includes: three-phase busbars connected to three-phase coils; and three-phase external terminals that are members different from the three-phase busbars, the three-phase external terminals being connected to the three-phase busbars and electrically connected to a power supply source. Each of the three-phase external terminals includes: a terminal body portion; a busbar-side connection portion connected to a busbar of one phase from among the three-phase busbars; and a power-supply-source-side connection portion electrically connected to the power supply source. At least two terminals among the three-phase external terminals are different in length of a conduction path through which a current flows between the busbar-side connection portion and the power-supply-source-side connection portion in the terminal body portion.Type: ApplicationFiled: June 1, 2020Publication date: October 6, 2022Inventors: Hibiki TAKADA, Takahiro HIWA, Hisashi FUJIHARA, Tatsuhiko MIZUTANI
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Publication number: 20220320936Abstract: A stator includes three-phase coils in which slot accommodation portions are accommodated inside slots; three external terminals; and three busbars that electrically connect the external terminals and the coils. A first coil end and a second coil end that are positioned respectively at the ends of each of the coils extend from the radially outermost side of the slots toward the first side or the second side in the axial direction of the stator core. The winding-start coil ends of the three-phase coils are connected to busbar connection portions of different busbars.Type: ApplicationFiled: June 1, 2020Publication date: October 6, 2022Inventors: Hibiki TAKADA, Takahiro HIWA, Hisashi FUJIHARA, Tatsuhiko MIZUTANI
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Publication number: 20220247287Abstract: A stator includes a stator core, three-phase coils, three external terminals, and three busbars. Each of the three-phase coils has a first coil end protruding from the radially outermost side of a slot to a first side in the axial direction of the stator core. Each of the three bus bars includes a busbar body portion extending in a circumferential direction of the stator core, a busbar connection portion extending toward the first side in the axial direction, and an external terminal connection portion extending outward in the radial direction and connected to the external terminal. The first coil end extends in the radial direction through between the busbar body portion and the stator core in the axial direction, extends toward the first side in the axial direction on a radially outer side of the busbar body portion, and has a tip connected to the busbar connection portion from the radially outer side.Type: ApplicationFiled: June 1, 2020Publication date: August 4, 2022Inventors: Hibiki TAKADA, Takahiro HIWA, Hisashi FUJIHARA, Tatsuhiko MIZUTANI
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Publication number: 20220094250Abstract: A motor assembly includes a motor including a rotor including a shaft rotatable about a rotation axis and a stator surrounding the rotor from radially outside, a housing that accommodates the motor, a bearing that is fixed to the housing and rotatably supports the shaft, a resolver including a resolver rotor fixed to the shaft and a resolver stator fixed to the housing, and a contact that has conductivity, is fixed to the housing, and is in contact with a contacted portion at an end portion on one axial side of the shaft. The housing includes an accommodation space in which the contacted portion of the shaft is accommodated. The contact and the resolver are side by side in a direction along a rotation axis in the accommodation space.Type: ApplicationFiled: September 22, 2021Publication date: March 24, 2022Inventors: Takayuki MAKINO, Tatsuhiko MIZUTANI, Masato AONO
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Patent number: 11056957Abstract: A rotary electric machine equipped with a magnetic flux variable mechanism includes a case body, a mover moving upon receipt of centrifugal force, a magnetic flux short circuit member, a cam member, and biasing springs. The cam member includes a cam surface so as to face the mover and make contact with the mover, and the cam member converts a radial movement of the mover received by the cam surface into an axial movement of the magnetic flux short circuit member. The biasing springs give a biasing force to the magnetic flux short circuit member in a direction distanced from an axial end surface of the rotor core, so as to determine a position of the magnetic flux short circuit member along the axial direction in a state where the biasing force is balanced with the centrifugal force applied to the mover via the cam member.Type: GrantFiled: November 16, 2018Date of Patent: July 6, 2021Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroyuki Hattori, Tatsuhiko Mizutani
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Patent number: 10804642Abstract: A shield cover (1) made of metal is configured to be attached to a device and includes a cover body (10) configured to cover a shield target. Two planar attachment plates (11, 13) protrude from the cover body (10). Bolt insertion holes (11A, 13A) extend through the respective attachment plates (11, 13) in a thickness direction thereof and receive bolts (30) for attaching the shield cover (1) to the device. The attachment plates (11, 13) are configured to be attached to the device with brackets (20) sandwiched between the device and the attachment plates (11, 13). A rib (12) extends up along an edge of at least one of the attachment plates (11, 13) to reinforce a portion of the attachment plate (11, 13) that will not be sandwiched between the bolt (30) and the bracket (20).Type: GrantFiled: October 12, 2016Date of Patent: October 13, 2020Assignees: Sumitomo Wiring Systems, Ltd., Toyota Jidosha Kabushiki KaishaInventors: Tetsuya Iida, Yosuke Kurono, Tatsuhiko Mizutani
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Patent number: 10622873Abstract: In the case of a laminated rotor core 10, insertion of permanent magnets 14 and filling of resin 15 into each of magnet insertion holes 13 are performed in order to cancel out a problem of an imbalanced weight estimated from a deviation of lamination thickness in a circumferential direction of a laminated core body 12, and a manufacturing method includes a step of measuring a deviation of lamination thickness in which an imbalanced weight is estimated by measuring the deviation of lamination thickness in the circumferential direction of the laminated core body 12, and a step of balance adjustment in which the insertion of the permanent magnets 14 into each of the magnet insertion holes 13 and the filling of resin 15 into each of the magnet insertion holes 13 are performed in a manner that cancels out a problem of this imbalanced weight.Type: GrantFiled: July 8, 2015Date of Patent: April 14, 2020Assignees: MITSUI HIGH-TEC, INC., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Akira Nagai, Kenji Katsuki, Go Kato, Jin Oda, Yuzo Ohta, Masashi Matsumoto, Tatsuhiko Mizutani
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Publication number: 20190165659Abstract: A rotary electric machine equipped with a magnetic flux variable mechanism includes a case body, a mover moving upon receipt of centrifugal force, a magnetic flux short circuit member, a cam member, and biasing springs. The cam member includes a cam surface so as to face the mover and make contact with the mover, and the cam member converts a radial movement of the mover received by the cam surface into an axial movement of the magnetic flux short circuit member. The biasing springs give a biasing force to the magnetic flux short circuit member in a direction distanced from an axial end surface of the rotor core, so as to determine a position of the magnetic flux short circuit member along the axial direction in a state where the biasing force is balanced with the centrifugal force applied to the mover via the cam member.Type: ApplicationFiled: November 16, 2018Publication date: May 30, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroyuki HATTORI, Tatsuhiko MIZUTANI
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Patent number: 10305226Abstract: A shield connector (1) includes electric wires (11), a housing (20), a shield conductor (30), and a shield bracket (40). The shield bracket 40 includes a main bracket (50) including a conductor holding portion (51), first and second connection portions (61, 71) and an auxiliary bracket (80). The conductor holding portion (51) and the shield conductor (30) held thereby the cover outlet tubes (27) and the electric wires (11) from one side. The housing (20) includes first and second attachment protrusions (25, 26). The first connection portion (61) includes a first attachment piece (64) engaged with the first attachment protrusion (25). The auxiliary bracket (80) includes an auxiliary attachment piece (82) engaged with the second attachment protrusion (26). An overlapping plate (81) of the auxiliary bracket (80) is swaged onto the second connection portion (71) by a swaging piece (75) of the second connection portion (71).Type: GrantFiled: October 14, 2016Date of Patent: May 28, 2019Assignees: Sumitomo Wiring Systems, Ltd., Toyota Jidosha Kabishiki KaishaInventors: Tetsuya Iida, Yosuke Kurono, Tatsuhiko Mizutani
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Publication number: 20180316122Abstract: A shield cover (1) made of metal is configured to be attached to a device and includes a cover body (10) configured to cover a shield target. Two planar attachment plates (11, 13) protrude from the cover body (10). Bolt insertion holes (11A, 13A) extend through the respective attachment plates (11, 13) in a thickness direction thereof and receive bolts (30) for attaching the shield cover (1) to the device. The attachment plates (11, 13) are configured to be attached to the device with brackets (20) sandwiched between the device and the attachment plates (11, 13). A rib (12) extends up along an edge of at least one of the attachment plates (11, 13) to reinforce a portion of the attachment plate (11, 13) that will not be sandwiched between the bolt (30) and the bracket (20).Type: ApplicationFiled: October 12, 2016Publication date: November 1, 2018Inventors: Tetsuya Iida, Yosuke Kurono, Tatsuhiko Mizutani
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Publication number: 20180309245Abstract: A shield connector (1) includes electric wires (11), a housing (20), a shield conductor (30), and a shield bracket (40). The shield bracket 40 includes a main bracket (50) including a conductor holding portion (51), first and second connection portions (61, 71) and an auxiliary bracket (80). The conductor holding portion (51) and the shield conductor (30) held thereby the cover outlet tubes (27) and the electric wires (11) from one side. The housing (20) includes first and second attachment protrusions (25, 26). The first connection portion (61) includes a first attachment piece (64) engaged with the first attachment protrusion (25). The auxiliary bracket (80) includes an auxiliary attachment piece (82) engaged with the second attachment protrusion (26). An overlapping plate (81) of the auxiliary bracket (80) is swaged onto the second connection portion (71) by a swaging piece (75) of the second connection portion (71).Type: ApplicationFiled: October 14, 2016Publication date: October 25, 2018Inventors: Tetsuya IIDA, Yosuke KURONO, Tatsuhiko MIZUTANI
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Patent number: 9806572Abstract: A rotor 14 includes a shaft having a coolant flow passage and a coolant supply port, a rotor core 24 fixed on the shaft and formed of laminated steel plates, and a magnet set 32 provided in the rotor core 24 to extend along an axial direction thereof. The rotor core 24 has a first flow passage 34 provided near the magnet to extend therealong and a second flow passage 36 that connects the coolant supply port 28 of the shaft 22 and the first flow passage 34, thereby constituting a coolant flow path. The second flow passage 36 is formed by overlapping second slits 37 formed in the respective steel plates at an axially intermediate region A of the rotor core 24, the formed position of the second slit 37 being different for each steel plate combined. The first flow passage 34 and the second flow passage 36 join at the axially intermediate region A of the rotor core 24.Type: GrantFiled: March 7, 2014Date of Patent: October 31, 2017Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN AW CO., LTD., AISIN SEIKI KABUSHIKI KAISHAInventors: Yoshitada Yamagishi, Yu Hirai, Tatsuhiko Mizutani, Masashi Matsumoto, Takashi Matsumoto, Shinya Sano, Taketo Takeuchi, Akifumi Kurokawa
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Patent number: 9709508Abstract: There is provided a method for inspecting a laminated iron core structured by laminating a plurality of iron core pieces-having a predetermined shape and including therein a cooling flow path allowing refrigerant to flow therethrough, the refrigerant being supplied and discharged through openings formed at different positions. The method includes arranging a light projecting part and a light receiving part of a photosensor in the openings of the cooling flow path, respectively, and detecting light from the light projecting part by the light receiving part to thereby inspect a penetrating state of the cooling flow path.Type: GrantFiled: April 1, 2016Date of Patent: July 18, 2017Assignees: MITSUI HIGH-TEC, INC., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Tadashi Shibuta, Masashi Matsumoto, Tatsuhiko Mizutani, Yoshitada Yamagishi
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Publication number: 20160299087Abstract: There is provided a method for inspecting a laminated iron core structured by laminating a plurality of iron core pieces-having a predetermined shape and including therein a cooling flow path allowing refrigerant to flow therethrough, the refrigerant being supplied and discharged through openings formed at different positions. The method includes arranging a light projecting part and a light receiving part of a photosensor in the openings of the cooling flow path, respectively, and detecting light from the light projecting part by the light receiving part to thereby inspect a penetrating state of the cooling flow path.Type: ApplicationFiled: April 1, 2016Publication date: October 13, 2016Applicants: MITSUI HIGH-TEC, INC., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Tadashi SHIBUTA, Masashi MATSUMOTO, Tatsuhiko MIZUTANI, Yoshitada YAMAGISHI
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Patent number: 9438082Abstract: A rotary electric machine includes a coil portion of the stator coil that protrudes from an end of a stator core, a terminal module that is provided on a top of the coil portion on an axial end of the coil portion and that electrically connects the stator coil and an external electric device, and a cover unit in which a cover that covers the terminal module and a guide that guides a coolant to the coil portion are formed together into one piece. The guide is provided on each of circumferentially opposite sides of the cover to supply a coolant to the coil portion in a distributed manner.Type: GrantFiled: July 30, 2012Date of Patent: September 6, 2016Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yosuke Kurono, Tatsuhiko Mizutani
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Patent number: 9425665Abstract: In a stator and a rotating electric machine equipped with this stator, the insulation properties of a coil are ensured by suppressing lead wire stress generated during a stator assembly process. The stator has a stator core, a coil wound around the stator core, lead wires led out from the coil, and power lines provided between the lead wires and a connection terminal of an external circuit. The lead wires and the power lines are electrically connected with each other through an elastically deformable elastic bus bar. Even if a shift occurs in the relative position between the coil and the connection terminal during the assembly process of the stator, this configuration allows the elastic bus bar to absorb the shift and makes it possible to suppress the stress generated on the lead wires.Type: GrantFiled: December 28, 2010Date of Patent: August 23, 2016Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATIONInventors: Kazuhiro Goto, Yosuke Kurono, Tatsuhiko Mizutani, Kazuya Onuki
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Publication number: 20160036276Abstract: A rotor 14 includes a shaft having a coolant flow passage and a coolant supply port, a rotor core 24 fixed on the shaft and formed of laminated steel plates, and a magnet set 32 provided in the rotor core 24 to extend along an axial direction thereof. The rotor core 24 has a first flow passage 34 provided near the magnet to extend therealong and a second flow passage 36 that connects the coolant supply port 28 of the shaft 22 and the first flow passage 34, thereby constituting a coolant flow path. The second flow passage 36 is formed by overlapping second slits 37 formed in the respective steel plates at an axially intermediate region A of the rotor core 24, the formed position of the second slit 37 being different for each steel plate combined. The first flow passage 34 and the second flow passage 36 join at the axially intermediate region A of the rotor core 24.Type: ApplicationFiled: March 7, 2014Publication date: February 4, 2016Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN SEIKI KABUSHIKI KAISHA, AISIN AW CO., LTD.Inventors: Yoshitada YAMAGISHI, Yu HIRAI, Tatsuhiko MIZUTANI, Masashi MATSUMOTO, Takashi MATSUMOTO, Shinya SANO, Taketo TAKEUCHI, Akifumi KUROKAWA
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Publication number: 20160013709Abstract: In the case of a laminated rotor core 10, insertion of permanent magnets 14 and filling of resin 15 into each of magnet insertion holes 13 are performed in order to cancel out a problem of an imbalanced weight estimated from a deviation of lamination thickness in a circumferential direction of a laminated core body 12, and a manufacturing method includes a step of measuring a deviation of lamination thickness in which an imbalanced weight is estimated by measuring the deviation of lamination thickness in the circumferential direction of the laminated core body 12, and a step of balance adjustment in which the insertion of the permanent magnets 14 into each of the magnet insertion holes 13 and the filling of resin 15 into each of the magnet insertion holes 13 are performed in a manner that cancels out a problem of this imbalanced weight.Type: ApplicationFiled: July 8, 2015Publication date: January 14, 2016Applicants: Mitsui High-tec, Inc., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Akira Nagai, Kenji Katsuki, Go Kato, Jin Oda, Yuzo Ohta, Masashi Matsumoto, Tatsuhiko Mizutani