Patents by Inventor Motohiro Murahashi
Motohiro Murahashi 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: 7726007Abstract: A method of manufacturing a winding includes steps of twisting U-shaped conductor segments, inserting straight portions of the twisted conductor segments in slots of a stator core, bending ends of the straight portions in a circumferential direction of the stator core and joining the ends. The method further includes a step of pressing turn portions of the U-shaped conductor segments by a turn portion twisting apparatus such that widths of the turn portions reduce in radial directions. The pressing step is performed simultaneously with the twisting step. Alternatively, the pressing step is performed after the twisting step.Type: GrantFiled: March 2, 2007Date of Patent: June 1, 2010Assignee: Denso CorporationInventors: Mitsuru Kato, Yasunori Kitakado, Motohiro Murahashi
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Patent number: 7287311Abstract: A manufacturing method of a stator for vehicular rotary electric machine includes: forming an indentation in a radial direction in a side face of each of electrical conductors in the machine by pressing; inserting the electrical conductors in a radially side-by-side relationship with each other in slots of the machine; bending each of the electrical conductors and radially adjacent electrical conductors in different circumferential directions by a predetermined pole pitch such that the indentations formed in respective side faces of the adjacent electrical conductors pass each other in a face-to-face relationship; and bonding on each of the electrical conductors to one end of the adjacent electrical conductors.Type: GrantFiled: May 24, 2005Date of Patent: October 30, 2007Assignee: DENSO CorporationInventors: Masao Ichikawa, Yasunori Kitakado, Motohiro Murahashi, Kazuhiko Fukuda, Mitsuru Kato
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Publication number: 20070180681Abstract: A method of manufacturing a winding includes steps of twisting U-shaped conductor segments, inserting straight portions of the twisted conductor segments in slots of a stator core, bending ends of the straight portions in a circumferential direction of the stator core and joining the ends. The method further includes a step of pressing turn portions of the U-shaped conductor segments by a turn portion twisting apparatus such that widths of the turn portions reduce in radial directions. The pressing step is performed simultaneously with the twisting step. Alternatively, the pressing step is performed after the twisting step.Type: ApplicationFiled: March 2, 2007Publication date: August 9, 2007Applicant: Denso CorporationInventors: Mitsuru Kato, Yasunori Kitakado, Motohiro Murahashi
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Patent number: 7210215Abstract: A method of manufacturing a winding includes steps of twisting U-shaped conductor segments, inserting straight portions of the twisted conductor segments in slots of a stator core, bending ends of the straight portions in a circumferential direction of the stator core and joining the ends. The method further includes a step of pressing turn portions of the U-shaped conductor segments by a turn portion twisting apparatus such that widths of the turn portions reduce in radial directions. The pressing step is performed simultaneously with the twisting step. Alternatively, the pressing step is performed after the twisting step.Type: GrantFiled: April 29, 2005Date of Patent: May 1, 2007Assignee: Denso CorporationInventors: Mitsuru Kato, Yasunori Kitakado, Motohiro Murahashi
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Patent number: 7032291Abstract: A method of manufacturing a stator winding includes a twisting step of U-shaped conductor segments having a pair of straight portions by moving the straight portions in the circumferential direction while restraining the turn portions of the U-shaped conductor segments in the axial direction by a pressing tool. After the previously twisted U-shaped conductor segments are inserted into slots of a stator core, the straight portions are bent in the circumferential direction. The pressing tool is constituted of a stationary top plate that has recesses into which the straight portions are inserted and a movable top plate that is movable to close the recesses after the straight portions are inserted in the recesses.Type: GrantFiled: June 17, 2003Date of Patent: April 25, 2006Assignee: Denso CorporationInventors: Mitsuru Kato, Yasunori Kitakado, Motohiro Murahashi
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Patent number: 7034429Abstract: To secure insulation between electrical conductors at a coil end, a first electrical conductor at one coil end is arranged so as to intersect a radially adjacent second electrical conductor at one point or more. The electrical conductor is formed with radial indentations in side faces that are opposite side faces in opposing electrical conductors at any of the intersecting portions, the indentations having depths that increase toward the near ear of the electrical conductors. Sufficient clearances are thereby secured between electrical conductors in their intersecting portions near their ends where the insulating films are susceptible to damage because of welding heat. Electrical insulation is thus ensured, and the cooling efficiency at the coil end is improved.Type: GrantFiled: January 3, 2005Date of Patent: April 25, 2006Assignee: Denso CorporationInventors: Masao Ichikawa, Yasunori Kitakado, Motohiro Murahashi, Kazuhiko Fukuda, Mitsuru Kato
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Patent number: 6971153Abstract: A method of manufacturing a winding of a rotary electric machine includes steps of pressing a portion of a conductor segment in a predetermined direction to reduce its dimension in the direction, inserting the conductor segment into a slot of a stator core, bending the conductor segments and joining ends of the conductor segments. In the pressing step, the conductor segment is pressed with a punch in a condition that it is held in a die that has curved inside corner portions to restrict deformation of corners of the pressed portion.Type: GrantFiled: February 26, 2003Date of Patent: December 6, 2005Assignee: Denso CorporationInventors: Takashi Tokizawa, Mitsuru Kato, Yoshinori Nakamura, Yasunori Kitakado, Motohiro Murahashi
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Publication number: 20050217105Abstract: To secure insulation between electrical conductors at a coil end, a first electrical conductor at one coil end is arranged so as to intersect a radially adjacent second electrical conductor at one point or more. The electrical conductor is formed with radial indentations in side faces that are opposite side faces in opposing electrical conductors at any of the intersecting portions, the indentations having depths that increase toward the near ear of the electrical conductors. Sufficient clearances are thereby secured between electrical conductors in their intersecting portions near their ends where the insulating films are susceptible to damage because of welding heat. Electrical insulation is thus ensured, and the cooling efficiency at the coil end is improved.Type: ApplicationFiled: May 24, 2005Publication date: October 6, 2005Applicant: Denso CorporationInventors: Masao Ichikawa, Yasunori Kitakado, Motohiro Murahashi, Kazuhiko Fukuda, Mitsuru Kato
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Patent number: 6938323Abstract: A stator coil of a rotary electric machine such as an alternator for use in an automobile is composed of a plurality of U-shaped conductor segments inserted into slots formed in a stator core. Each segment has a head portion and two legs extending from the head portion. The plurality of segments include regular segments each having a regular distance between two legs (a regular slot-pitch) and special segments each having a special slot-pitch different from the regular slot-pitch. The head portions of both the regular and the special segments are simultaneously twisted to form the respectively required slot-pitches after a preliminary twist is given to the special segments. In this manner, a process of manufacturing the stator coil is simplified.Type: GrantFiled: December 20, 2002Date of Patent: September 6, 2005Assignee: Denso CorporationInventors: Mitsuru Katou, Yasunori Kitakado, Motohiro Murahashi
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Publication number: 20050188532Abstract: A method of manufacturing a winding includes steps of twisting U-shaped conductor segments, inserting straight portions of the twisted conductor segments in slots of a stator core, bending ends of the straight portions in a circumferential direction of the stator core and joining the ends. The method further includes a step of pressing turn portions of the U-shaped conductor segments by a turn portion twisting apparatus such that widths of the turn portions reduce in radial directions. The pressing step is performed simultaneously with the twisting step. Alternatively, the pressing step is performed after the twisting step.Type: ApplicationFiled: April 29, 2005Publication date: September 1, 2005Applicant: Denso CorporationInventors: Mitsuru Kato, Yasunori Kitakado, Motohiro Murahashi
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Patent number: 6903478Abstract: A method for manufacturing a winding for an electric rotating machine includes steps of altering, passing, shaping, and connecting. In the altering step, connecting portions of conductor segments, a part of which is exposed, are altered in shape by a pressing die to provide good contact between the segments when they are connected. The altered segments are passing through slots of a stator core in the passing step. Ends of protruded portions of the segments are shaped so that they make an angle with respect to the radial section of the stator core in the shaping step. Adjacent segments are connected together at ends of the connecting portion in the connecting step.Type: GrantFiled: March 14, 2003Date of Patent: June 7, 2005Assignee: Denso CorporationInventors: Masaomi Dobashi, Mitsuru Kato, Koji Hayashida, Hiroaki Takeda, Yoshinori Nakamura, Yasunori Kitakado, Motohiro Murahashi
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Patent number: 6903479Abstract: A method of manufacturing a winding includes steps of twisting U-shaped conductor segments, inserting straight portions of the twisted conductor segments in slots of a stator core, bending ends of the straight portions in a circumferential direction of the stator core and joining the ends. The method further includes a step of pressing turn portions of the U-shaped conductor segments by a turn portion twisting apparatus such that widths of the turn portions reduce in radial directions. The pressing step is performed simultaneously with the twisting step. Alternatively, the pressing step is performed after the twisting step.Type: GrantFiled: May 28, 2003Date of Patent: June 7, 2005Assignee: Denso CorporationInventors: Mitsuru Kato, Yasunori Kitakado, Motohiro Murahashi
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Publication number: 20050116571Abstract: To secure insulation between electrical conductors at a coil end, a first electrical conductor at one coil end is arranged so as to intersect a radially adjacent second electrical conductor at one point or more. The electrical conductor is formed with radial indentations in side faces that are opposite side faces in opposing electrical conductors at any of the intersecting portions, the indentations having depths that increase toward the near ear of the electrical conductors. Sufficient clearances are thereby secured between electrical conductors in their intersecting portions near their ends where the insulating films are susceptible to damage because of welding heat. Electrical insulation is thus ensured, and the cooling efficiency at the coil end is improved.Type: ApplicationFiled: January 3, 2005Publication date: June 2, 2005Applicant: Denso CorporationInventors: Masao Ichikawa, Yasunori Kitakado, Motohiro Murahashi, Kazuhiko Fukuda, Mitsuru Kato
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Patent number: 6897594Abstract: To secure insulation between electrical conductors at a coil end, a first electrical conductor at one coil end is arranged so as to intersect a radially adjacent second electrical conductor at one point or more. The electrical conductor is formed with radial indentations in side faces that are opposite side faces in opposing electrical conductors at any of the intersecting portions, the indentations having depths that increase toward the near end of the electrical conductors. Sufficient clearances are thereby secured between electrical conductors in their intersecting portions near their ends where the insulating films are susceptible to damage because of welding heat. Electrical insulation is thus ensured, and the cooling efficiency at the coil end is improved.Type: GrantFiled: January 14, 2003Date of Patent: May 24, 2005Assignee: Denso CorporationInventors: Masao Ichikawa, Yasunori Kitakado, Motohiro Murahashi, Kazuhiko Fukuda, Mitsuru Kato
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Publication number: 20040074080Abstract: A method of manufacturing a stator winding includes a twisting step of U-shaped conductor segments having a pair of straight portions by moving the straight portions in the circumferential direction while restraining the turn portions of the U-shaped conductor segments in the axial direction by a pressing tool. After the previously twisted U-shaped conductor segments are inserted into slots of a stator core, the straight portions are bent in the circumferential direction. The pressing tool is constituted of a stationary top plate that has recesses into which the straight portions are inserted and a movable top plate that is movable to close the recesses after the straight portions are inserted in the recesses.Type: ApplicationFiled: June 17, 2003Publication date: April 22, 2004Applicant: Denso CorporationInventors: Mitsuru Kato, Yasunori Kitakado, Motohiro Murahashi
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Publication number: 20040006866Abstract: A method of manufacturing a winding includes steps of twisting U-shaped conductor segments, inserting straight portions of the twisted conductor segments in slots of a stator core, bending ends of the straight portions in a circumferential direction of the stator core and joining the ends. The method further includes a step of pressing turn portions of the U-shaped conductor segments by a turn portion twisting apparatus such that widths of the turn portions reduce in radial directions. The pressing step is performed simultaneously with the twisting step. Alternatively, the pressing step is performed after the twisting step.Type: ApplicationFiled: May 28, 2003Publication date: January 15, 2004Applicant: DENSO CORPORATIONInventors: Mitsuru Kato, Yasunori Kitakado, Motohiro Murahashi
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Patent number: 6674211Abstract: Plural slots are formed in a cylindrical stator or rotor core of a rotary electric machine. An insulation sleeve having a substantially rectangular cross-section is inserted into each slot, and conductors are inserted into an inner space of the insulation sleeve disposed in the slot. The inner space of the insulation sleeve is enlarged by inserting the conductors, thereby strongly pressing the corner portions of the insulation sleeve against the corners of the slot. Thus, the insulation sleeve is firmly kept in the slot, avoiding its sliding movement in the slot in the process of inserting the conductors. The insulation sleeve is prevented from being damaged by its sliding movement in the slot.Type: GrantFiled: December 20, 2002Date of Patent: January 6, 2004Assignee: Denso CorporationInventors: Mitsuru Katou, Yasunori Kitakado, Motohiro Murahashi
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Publication number: 20030222528Abstract: A method for manufacturing a winding for an electric rotating machine includes steps of altering, passing, shaping, and connecting. In the altering step, connecting portions of conductor segments, a part of which is exposed, are altered in shape by a pressing die to provide good contact between the segments when they are connected. The altered segments are passing through slots of a stator core in the passing step. Ends of protruded portions of the segments are shaped so that they make an angle with respect to the radial section of the stator core in the shaping step. Adjacent segments are connected together at ends of the connecting portion in the connecting step.Type: ApplicationFiled: March 14, 2003Publication date: December 4, 2003Applicant: Denso CorporationInventors: Masaomi Dobashi, Mitsuru Kato, Koji Hayashida, Hiroaki Takeda, Yoshinori Nakamura, Yasunori Kitakado, Motohiro Murahashi
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Publication number: 20030163912Abstract: A method of manufacturing a winding of a rotary electric machine includes steps of pressing a portion of a conductor segment in a predetermined direction to reduce its dimension in the direction, inserting the conductor segment into a slot of a stator core, bending the conductor segments and joining ends of the conductor segments. In the pressing step, the conductor segment is pressed with a punch in a condition that it is held in a die that has curved inside corner portions to restrict deformation of corners of the pressed portion.Type: ApplicationFiled: February 26, 2003Publication date: September 4, 2003Applicant: DENSO CORPORATIONInventors: Takashi Tokizawa, Mitsuru Kato, Yoshinori Nakamura, Yasunori Kitakado, Motohiro Murahashi
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Publication number: 20030135980Abstract: To secure insulation between electrical conductors at a coil end, a first electrical conductor at one coil end is arranged so as to intersect a radially adjacent second electrical conductor at one point or more. The electrical conductor is formed with radial indentations in side faces that are opposite side faces in opposing electrical conductors at any of the intersecting portions, the indentations having depths that increase toward the near end of the electrical conductors. Sufficient clearances are thereby secured between electrical conductors in their intersecting portions near their ends where the insulating films are susceptible to damage because of welding heat. Electrical insulation is thus ensured, and the cooling efficiency at the coil end is improved.Type: ApplicationFiled: January 14, 2003Publication date: July 24, 2003Applicant: DENSO CORPORATIONInventors: Masao Ichikawa, Yasunori Kitakado, Motohiro Murahashi, Kazuhiko Fukuda, Mitsuru Kato