Patents by Inventor Toshimi Abukawa
Toshimi Abukawa 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: 6927526Abstract: A rotor of a motor is attached to a rotor axis slidably both in axial direction and rotational direction, each of elastic bodies is attached to each of side faces of the rotor, and the rotor is fastened to the rotor axis through the elastic body, mechanically by applying pressure on each of the side faces of the rotor in the axial direction through the elastic body, or chemically by bonding the rotor axis and each of the elastic bodies as well as each of the elastic bodies and each of the corresponding side faces of the rotor.Type: GrantFiled: May 7, 2003Date of Patent: August 9, 2005Assignee: Japan Servo Co., Ltd.Inventors: Hitoshi Ishii, Katsuo Kawashima, Hideo Takahashi, Toshio Kobayashi, Toshimi Abukawa
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Publication number: 20050138793Abstract: In an abduction-type motor having a divided core 5 (a-l) formed by dividing a stator core into plural blocks and a motor stator having such a structure as the divided core may be reassembled, the motor has a coil winding frame 6 continuously formed a continuous unit of coupling parts, a part of which is flexible and made of insulation material, embedded into the individual divided cores, and a coil 7 arranged and wound by supporting the divided core so that the teeth top parts of the divided core may be directed inside and located on a circle, in which its coil winding structure has the number of coil stages at the teeth top part (external peripheral part) of the divided core larger than the number of the coil stages at the internal peripheral part, and the diameter of the teeth top part of the divided core after assembly is identical to the diameter of the teeth top part while coil winding work, and the length of the crossover line 7s between the coil windings is made enough to be equivalent to a single slotType: ApplicationFiled: March 1, 2005Publication date: June 30, 2005Applicants: Hitachi LTD, Japany Servo Co., LTD.Inventors: Yuji Enomoto, Masashi Kitamura, Miyoshi Takahashi, Makoto Ochiai, Takashi Ando, Sachio Hatori, Yasuaki Motegi, Toshimi Abukawa
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Patent number: 6876118Abstract: In an abduction-type motor having a divided core 5(a-l) formed by dividing a stator core into plural blocks and a motor stator having such a structure as the divided core may be reassembled, the motor has a coil winding frame 6 continuously formed a continuous unit of coupling parts, a part of which is flexible and made of insulation material, embedded into the individual divided cores, and a coil 7 arranged and wound by supporting the divided core so that the teeth top parts of the divided core may be directed inside and located on a circle, in which its coil winding structure has the number of coil stages at the teeth top part (external peripheral part) of the divided core larger than the number of the coil stages at the internal peripheral part, and the diameter of the teeth top part of the divided core after assembly is identical to the diameter of the teeth top part while coil winding work, and the length of the crossover line 7s between the coil windings is made enough to be equivalent to a single slotType: GrantFiled: August 30, 2002Date of Patent: April 5, 2005Assignees: Hitachi, Ltd., Japan Servo Co., Ltd.Inventors: Yuji Enomoto, Masashi Kitamura, Miyoshi Takahashi, Makoto Ochiai, Takashi Ando, Sachio Hatori, Yasuaki Motegi, Toshimi Abukawa
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Patent number: 6812611Abstract: A PM-type electric rotating machine comprises a rotation axis, a rotor that rotates together with the rotation axis and a stator that rotatably supports the rotation axis. The rotor has a closed-end-cup-shaped holder that is mounted at one end of the rotation axis and a permanent magnet fixed on an inner surface of a cylindrical portion of the holder. The stator has a housing bush that supports the rotation axis in an axis hole formed through the center of the housing bush, twelve stator cores that are radially mounted around the housing bush to face the outer tip ends thereof to the permanent magnet with an air gap, and coils that are wound around the stator cores via insulators. The inner base portions of the stator cores are connected to one another with pressure so as to form a ring-shaped yoke by mounting the stator cores around the housing bush.Type: GrantFiled: July 15, 2003Date of Patent: November 2, 2004Assignee: Japan Servo Co., Ltd.Inventors: Takashi Ando, Yasuaki Moteki, Yuji Takagai, Toshimi Abukawa, Sachio Hatori, Makoto Ochiai
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Patent number: 6806615Abstract: A core has an annular inner core portion, a rib-shaped core portion extending radially from the annular inner core portion and an outer peripheral core portion. Magnetic pole tooth portions are formed in an annular shape on the outer periphery of the rib-shaped core portion, and the core is composed of a plurality of core blocks having the same shapes as blocks formed by dividing the core in circumferential direction.Type: GrantFiled: March 28, 2002Date of Patent: October 19, 2004Assignees: Hitachi, Ltd., Japan Servo Co., Ltd.Inventors: Yuuji Enomoto, Masashi Kitamura, Toshimi Abukawa, Yuji Takagai
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Patent number: 6794786Abstract: In an electric motor comprising a rotor, a stator, a stator core that constitutes the stator, a core section that constitutes the stator core, a plurality of split core blocks which constitute the core section, and a metallic connection housing that connects the split core blocks in dovetailed form to create one connected core section, the split core blocks are each formed of a laminated steel plate, in that the connection housing is formed of a material softer than the laminated steel plate, and the dovetailed connections at the connection housing are plastically deformed to remove the connection gap existing at each of the dovetailed connections.Type: GrantFiled: October 7, 2003Date of Patent: September 21, 2004Assignees: Hitachi, Ltd., Japan Servo Co., Ltd.Inventors: Yuuji Enomoto, Yasuaki Motegi, Masashi Kitamura, Yuji Takagai, Toshimi Abukawa, Takashi Ando
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Patent number: 6784590Abstract: A permanent magnet motor comprising a permanent magnet and an armature having a plurality of winding grooves facing the permanent magnet with an air gap therebetween. The armature has a plurality of auxiliary grooves on a magnetic pole surface thereof, wherein a composite of two vectors of cogging torque generated by the auxiliary grooves is deviated by 180° or 120° from a vector of cogging torque generated by the winding grooves in the sixth harmonic plane, and wherein a width of a portion of an air gap magnetic flux density waveform that includes a value that is more than 90% of a peak value of the air gap magnetic flux density waveform is less than 80% or 86% of a width of a pole pitch portion of the air gap magnetic flux density waveform.Type: GrantFiled: March 28, 2002Date of Patent: August 31, 2004Assignee: Japan Servo Co., Ltd.Inventors: Kazuo Ohnishi, Toshimi Abukawa, Tokio Sekiguchi
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Patent number: 6731027Abstract: A three-phase hybrid type stepping motor of the present invention comprises a stator, a rotor arranged concentrically with the stator and with an air gap therebetween, six stator poles extending radially and formed at a regular pitch on the inner peripheral surface of an annular stator yoke, each of the stator poles having a plurality of small stator teeth at the tip end thereof, the rotor having two splitted rotor elements and a permanent magnet held therebetween and magnetized so as to form N and S poles in the axial direction thereof, fifty of small rotor teeth formed at a regular pitch on the outer peripheral surface of each of the rotor elements, the two splitted rotor elements being shifted from each other in angular position by a ½ pitch of the small rotor teeth, wherein a permeance distribution of the small stator teeth is a vernier pitch balanced by a six or three order harmonic wave, and a ratio of the width of the pole tooth to the rotor teeth pitch is set to 0.35-0.45.Type: GrantFiled: February 22, 2002Date of Patent: May 4, 2004Assignee: Japan Servo Co., Ltd.Inventors: Kazuo Ohnishi, Toshimi Abukawa, Masafumi Sakamoto, Koki Isozaki
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Publication number: 20040070304Abstract: In an electric motor comprising a rotor, a stator, a stator core that constitutes the stator, a core section that constitutes the stator core, a plurality of split core blocks which constitute the core section, and a metallic connection housing that connects the split core blocks in dovetailed form to create one connected core section, the split core blocks are each formed of a laminated steel plate, in that the connection housing is formed of a material softer than the laminated steel plate, and the dovetailed connections at the connection housing are plastically deformed to remove the connection gap existing at each of the dovetailed connections.Type: ApplicationFiled: October 7, 2003Publication date: April 15, 2004Applicants: Hitachi, Ltd., Japan Servo Co., Ltd.Inventors: Yuuji Enomoto, Yasuaki Motegi, Masashi Kitamura, Yuji Takagai, Toshimi Abukawa, Takashi Ando
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Publication number: 20040061410Abstract: A PM-type electric rotating machine comprises a rotation axis, a rotor that rotates together with the rotation axis and a stator that rotatably supports the rotation axis. The rotor has a closed-end-cup-shaped holder that is mounted at one end of the rotation axis and a permanent magnet fixed on an inner surface of a cylindrical portion of the holder. The stator has a housing bush that supports the rotation axis in an axis hole formed through the center of the housing bush, twelve stator cores that are radially mounted around the housing bush to face the outer tip ends thereof to the permanent magnet with an air gap, and coils that are wound around the stator cores via insulators. The inner base portions of the stator cores are connected to one another with pressure so as to form a ring-shaped yoke by mounting the stator cores around the housing bush.Type: ApplicationFiled: July 15, 2003Publication date: April 1, 2004Applicant: JAPAN SERVO CO., LTD.Inventors: Takashi Ando, Yasuaki Moteki, Yuji Takagai, Toshimi Abukawa, Tomoko Abukawa, Sachio Hatori, Makoto Ochiai
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Publication number: 20040056557Abstract: (Subject) The present invention clarifies the stator core configuration and winding specifications required to ensure that the stator formed by assembling the split cores of an epicycloidal motor exhibits the optimum performances, and provides a high-efficiency compact-sized motor.Type: ApplicationFiled: July 17, 2003Publication date: March 25, 2004Inventors: Yuji Enomoto, Toshimi Abukawa, Tomoko Abukawa, Yasuaki Motegi, Sachio Hatori, Takashi Ando
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Publication number: 20040017127Abstract: A rotor of a motor is attached to a rotor axis slidably both in axial direction and rotational direction, each of elastic bodies is attached to each of side faces of the rotor, and the rotor is fastened to the rotor axis through the elastic body, mechanically by applying pressure on each of the side faces of the rotor in the axial direction through the elastic body, or chemically by bonding the rotor axis and each of the elastic bodies as well as each of the elastic bodies and each of the corresponding side faces of the rotor.Type: ApplicationFiled: May 7, 2003Publication date: January 29, 2004Inventors: Hitoshi Ishii, Katsuo Kawashima, Hideo Takahashi, Toshio Kobayashi, Toshimi Abukawa
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Publication number: 20030184181Abstract: A permanent magnet motor comprising a permanent magnet and an armature having a plurality of winding grooves facing the permanent magnet with an air gap therebetween. The armature has a plurality of auxiliary grooves on a magnetic pole surface thereof, wherein a composite vector of vectors of the auxiliary grooves is deviated by 180° or 120° from a vector of the winding grooves in sixth harmonic plane, and wherein a width of a wave form portion of a value more than 90% of a peak value of a magnetomotive force wave form formed by the permanent magnet is lower than 80% or 86% of an entire width of the wave form. Each of vectors of the auxiliary grooves is deviated by 180° or 120° from a vector of the winding groove in sixth harmonic plane, respectively, and wherein a width of a wave form portion of a value more than 90% of a peak value of a magnetomotive force wave form formed by the permanent magnet is lower than 80% or 86% of an entire width of the wave form.Type: ApplicationFiled: March 28, 2002Publication date: October 2, 2003Applicant: Japan Servo Co., Ltd.Inventors: Kazuo Ohnishi, Toshimi Abukawa, Tokio Sekiguchi
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Publication number: 20030155834Abstract: In an abduction-type motor having a divided core 5(a-l) formed by dividing a stator core into plural blocks and a motor stator having such a structure as the divided core may be reassembled, the motor has a coil winding frame 6 continuously formed a continuous unit of coupling parts, a part of which is flexible and made of insulation material, embedded into the individual divided cores, and a coil 7 arranged and wound by supporting the divided core so that the teeth top parts of the divided core may be directed inside and located on a circle, in which its coil winding structure has the number of coil stages at the teeth top part (external peripheral part) of the divided core larger than the number of the coil stages at the internal peripheral part, and the diameter of the teeth top part of the divided core after assembly is identical to the diameter of the teeth top part while coil winding work, and the length of the crossover line 7s between the coil windings is made enough to be equivalent to a single slotType: ApplicationFiled: August 30, 2002Publication date: August 21, 2003Inventors: Yuji Enomoto, Masashi Kitamura, Miyoshi Takahashi, Makoto Ochiai, Takashi Ando, Sachio Hatori, Yasuaki Motegi, Toshimi Abukawa
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Publication number: 20030098628Abstract: In an electric motor comprising a rotor, a stator, a stator core that constitutes the stator, a core section that constitutes the stator core, a plurality of split core blocks which constitute the core section, and a metallic connection housing that connects the split core blocks in dovetailed form to create one connected core section, the split core blocks are each formed of a laminated steel plate, in that the connection housing is formed of a material softer than the laminated steel plate, and the dovetailed connections at the connection housing are plastically deformed to remove the connection gap existing at each of the dovetailed connections.Type: ApplicationFiled: February 27, 2002Publication date: May 29, 2003Inventors: Yuuji Enomoto, Yasuaki Motegi, Masashi Kitamura, Yuji Takagai, Toshimi Abukawa, Takashi Ando
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Publication number: 20030062779Abstract: A three-phase hybrid type stepping motor of the present invention comprises a stator, a rotor arranged concentrically with the stator and with an air gap therebetween, six stator poles extending radially and formed at a regular pitch on the inner peripheral surface of an annular stator yoke, each of the stator poles having a plurality of small stator teeth at the tip end thereof, the rotor having two splitted rotor elements and a permanent magnet held therebetween and magnetized so as to form N and S poles in the axial direction thereof, fifty of small rotor teeth formed at a regular pitch on the outer peripheral surface of each of the rotor elements, the two splitted rotor elements being shifted from each other in angular position by a ½ pitch of the small rotor teeth, wherein a permeance distribution of the small stator teeth is a vernier pitch balanced by a six or three order harmonic wave, and a tooth width ratio of the small rotor teeth with the small stator teeth is set to 0.35-0.45.Type: ApplicationFiled: February 22, 2002Publication date: April 3, 2003Applicant: Japan Servo Co., Ltd.Inventors: Kazuo Ohnishi, Toshimi Abukawa, Masafumi Sakamoto, Koki Isozaki
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Publication number: 20030030345Abstract: A core has an annular inner core portion, a rib-shaped core portion extending radially form the annular inner core portion and an outer peripheral core portion that magnetic pole tooth portions are formed in an annular shape on the outer periphery of the rib-shaped core portion, and the core is composed of a plurality of core blocks having the same shapes as blocks formed by dividing the core in circumferential direction, the plurality of core blocks each having a concave/convex engage portion at an inner peripheral portion corresponding to the inner periphery of the annular inner core portion, and the plurality of core blocks gathered so as to form the core are fastened each other by a cylindrical housing having an outer surface formed in concave/convex shape, inserted in the inner peripheral portion so as to engage with each other at the concave/convex engage portions, and changed in diameter relative to the core blocks due to thermal shrinkage or expansion of the cylindrical housing, whereby the core blockType: ApplicationFiled: March 28, 2002Publication date: February 13, 2003Applicant: HITACHI, LTDInventors: Yuuji Enomoto, Masashi Kitamura, Toshimi Abukawa, Yuji Takagai
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Publication number: 20020140312Abstract: The invention concerns a method for manufacturing an armature of an internal rotor type electric machine comprising a plurality of stator teeth, coils wound on the stator teeth and a stator yoke on the inner circumference of which the stator teeth are fixed. The stator teeth are attached radially to an outer circumference of a connecting disc, then the coils are wound on the stator teeth, then external edges of the stator teeth are fixed to an inner circumference of the stator yoke and then the connecting disc is removed from the stator teeth.Type: ApplicationFiled: March 29, 2002Publication date: October 3, 2002Inventors: Shinji Ikeda, Hitoshi Ishii, Shinji Shimizu, Hiroshi Kikuchi, Toshimi Abukawa
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Patent number: 6335582Abstract: A permanent-magnet electric rotating machine with a concentrated winding stator, including a stator having a plurality of stator magnetic poles formed so as to extend radially from an annular yoke portion of a stator iron core, and windings mounted on the stator magnetic poles; and a rotor having a permanent magnet with a plurality of magnetic poles and rotatably held so as to face the stator through an air gap; wherein each of the stator magnetic poles has a straight shape having a width which is made constant over a whole length, small grooves are formed in each of the stator magnetic poles in symmetrical positions on opposite sides and near a top end portion of the stator magnetic pole, a bottom portion of each slot portion defined by adjacent ones of the stator magnetic poles and the yoke is formed triangularly, each of the stator winding is constituted so that a winding having a predetermined number of turns and winding being formed so as to be fittable to each of the stator magnetic poles is mounted onType: GrantFiled: April 15, 1998Date of Patent: January 1, 2002Assignee: Japan Servo Co., LTDInventors: Toshimi Abukawa, Kazuo Ohnishi, Hideaki Suzuki, Hitoshi Ishii, Keiichi Abe
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Patent number: 6313558Abstract: An electric rotary machine has a concentrated winding stator and a rotor facing the stator with a gap therebetween. The stator has M number of stator magnetic poles extending in the radial direction from an annular yoke, pole pieces each extending in the circumferential direction of the rotor from the tip end of each of the stator magnetic poles, and windings wound around the stator magnetic poles. The rotor having a permanent magnet with P number magnetic poles, wherein P:M=6n−2:6n, or P:M=6n+2:6n, where n is an integer not less than 2, and the figure of each of the pole pieces is so determined that a gap formed between the pole piece and the rotor is increased going toward the both ends of the pole piece.Type: GrantFiled: April 10, 2000Date of Patent: November 6, 2001Assignee: Japan Servo Co., Ltd.Inventors: Toshimi Abukawa, Kazuo Ohnishi, Yuji Takagai, Sachio Hatori, Kiyomichi Inoshita