Patents by Inventor Hirofumi Mizukami
Hirofumi Mizukami 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: 11664701Abstract: A motor includes a commutator, a brush, a first spring, a second spring, and a holder. The brush is configured to come into contact with the commutator to be electrically connected to the commutator. The first spring is configured to push the brush along the first direction toward the commutator. The second spring pushes the brush along a second direction intersecting the first direction. The holder is disposed such that the brush is located between the holder and the second spring in the second direction. The holder holds the brush between the holder and the second spring.Type: GrantFiled: November 12, 2019Date of Patent: May 30, 2023Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Takahiro Asano, Hirofumi Mizukami, Yasuharu Uchida
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Patent number: 11374459Abstract: A motor includes a frame in the shape of a bottomed cylinder, a stator housed in the frame, a rotor, an end plate for closing an opening of the frame, and bearings rotatably supporting a rotary shaft of the rotor. The frame has, on its bottom, a bearing holder at the center and ribs extending like rays from the bearing holder radially outward and protruding to the inside of the frame. Each rib has a radially outer end reaching a circumferential wall of the frame.Type: GrantFiled: April 2, 2019Date of Patent: June 28, 2022Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Yasuharu Uchida, Kazuo Toya, Hirofumi Mizukami
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Publication number: 20220014070Abstract: A motor includes a commutator, a brush, a first spring, a second spring, and a holder. The brush is configured to come into contact with the commutator to be electrically connected to the commutator. The first spring is configured to push the brush along the first direction toward the commutator. The second spring pushes the brush along a second direction intersecting the first direction. The holder is disposed such that the brush is located between the holder and the second spring in the second direction. The holder holds the brush between the holder and the second spring.Type: ApplicationFiled: November 12, 2019Publication date: January 13, 2022Inventors: Takahiro ASANO, Hirofumi MIZUKAMI, Yasuharu UCHIDA
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Publication number: 20210249931Abstract: A motor includes a frame in the shape of a bottomed cylinder, a stator housed in the frame, a rotor, an end plate for closing an opening of the frame, and bearings rotatably supporting a rotary shaft of the rotor. The frame has, on its bottom, a bearing holder at the center and ribs extending like rays from the bearing holder radially outward and protruding to the inside of the frame. Each rib has a radially outer end reaching a circumferential wall of the frame.Type: ApplicationFiled: April 2, 2019Publication date: August 12, 2021Inventors: Yasuharu UCHIDA, Kazuo TOYA, Hirofumi MIZUKAMI
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Patent number: 9644635Abstract: Fan (3) includes suction-side shroud (3a) and suction port (22) at the center portion of suction-side shroud (3a). Fan case (2) includes opening part (13) at a location facing suction port (22). Fan seal (4) is disposed between inner wall surface (2a) of fan case (2) and suction port-side end surface (3b) of suction-side shroud (3a). Opening part (13) includes a plurality of mushroom-shaped anchors (2b). Fan seal (4) includes holding parts (4b) that fit onto mushroom-shaped anchors (2b). Fan seal (4) is press-fitted onto fan case (2) that includes mushroom-shaped anchors (2b).Type: GrantFiled: March 4, 2013Date of Patent: May 9, 2017Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Hirofumi Mizukami, Tetsuo Shimasaki
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Patent number: 8987955Abstract: A stator, a rotor, bearings, and conductive brackets are provided. The stator has a stator iron core having a winding wound thereon. The rotor has a rotating body that holds a permanent magnet in the circumferential direction so that the permanent magnet faces the stator, and a shaft that has the rotating body fastened thereto so as to penetrate through the center of the rotating body. Both of the bearing on the output shaft side and the bearing opposite the output shaft side journal the shaft. One of the brackets fixes the bearing on the output shaft side, and the other of the brackets fixes the bracket opposite the output shaft side. The brackets are electrically connected to each other, and a dielectric layer is formed between the shaft and the outer periphery of the rotating body.Type: GrantFiled: May 12, 2010Date of Patent: March 24, 2015Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Hirofumi Mizukami, Akihiko Watanabe, Takehiko Hasegawa, Haruhiko Kado
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Patent number: 8975796Abstract: A motor includes a stator integrally molded together with a stator member, which includes a stator iron-core wound with a winding, by insulating resin, a rotor mounted on a shaft as a center and confronting the stator, two bearings supporting the shaft rotatably, brackets fixing the bearings, and a drive circuit board including a drive circuit which supplies an electric current to the winding and drives the rotor. Either one of the two bearings includes an outer ring and an inner ring both of which are electrically insulated from each other.Type: GrantFiled: March 29, 2010Date of Patent: March 10, 2015Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Haruhiko Kado, Hirofumi Mizukami, Akihiko Watanabe, Takehiko Hasegawa
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Patent number: 8957553Abstract: A brushless motor includes a stator molded integrally with a resin having a fixing member including a stator iron core and a winding wound thereon, a rotor of a disk-like iron core holding a ferrite resin magnet in a circumferential direction, the rotor arranged to face the stator about a shaft, a bearing rotatably supporting the shaft, and conductive brackets fixing the bearing. The brackets are electrically connected to each other with a conducting pin in the stator.Type: GrantFiled: December 11, 2009Date of Patent: February 17, 2015Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Takehiko Hasegawa, Hirofumi Mizukami, Akihiko Watanabe, Haruhiko Kado
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Publication number: 20140369870Abstract: Fan (3) includes suction-side shroud (3a) and suction port (22) at the center portion of suction-side shroud (3a). Fan case (2) includes opening part (13) at a location facing suction port (22). Fan seal (4) is disposed between inner wall surface (2a) of fan case (2) and suction port-side end surface (3b) of suction-side shroud (3a). Opening part (13) includes a plurality of mushroom-shaped anchors (2b). Fan seal (4) includes holding parts (4b) that fit onto mushroom-shaped anchors (2b). Fan seal (4) is press-fitted onto fan case (2) that includes mushroom-shaped anchors (2b).Type: ApplicationFiled: March 4, 2013Publication date: December 18, 2014Inventors: Hirofumi Mizukami, Tetsuo Shimasaki
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Patent number: 8901788Abstract: Provided is an electric motor driven by an inverter of PWM method, and devised to retard electrolytic corrosion in a bearing. A rotating body of a rotor comprises an outer iron core configuring an outer peripheral portion of the rotating body, an inner iron core configuring an inner peripheral portion connected to a shaft, a dielectric layer disposed between the outer iron core and the inner iron core, a plurality of insertion holes penetrating the outer iron core in the axial direction, and permanent magnets inserted individually in the plurality of insertion holes. It thus becomes possible to increase impedance of the rotor side (inner ring side of bearing) to approximate it to impedance of the stator side (outer ring side of the bearing) to thereby bring high frequency potentials balanced between the inner ring side and the outer ring side of the bearing, so as to provide the electric motor that retards electrolytic corrosion liable to occur in the bearing, and an electric device equipped with the same.Type: GrantFiled: September 7, 2010Date of Patent: December 2, 2014Assignee: Panasonic CorporationInventors: Akihiko Watanabe, Takehiko Hasegawa, Hirofumi Mizukami, Haruhiko Kado, Genki Kondo
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Patent number: 8587167Abstract: A motor includes: a stator molded integrally with an insulating resin having a fixing member including a stator iron core and a winding wound thereon; a rotor arranged to face the stator about a shaft; a bearing rotatably supporting the shaft; a bracket fixing the bearing; and a drive circuit substrate having a drive circuit mounted thereon for driving the winding. The stator iron core is electrically connected to a ground serving as a reference point of a zero potential on the drive circuit substrate through a conductive member.Type: GrantFiled: December 11, 2009Date of Patent: November 19, 2013Assignee: Panasonic CorporationInventors: Haruhiko Kado, Akihiko Watanabe, Hirofumi Mizukami, Takehiko Hasegawa
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Patent number: 8552601Abstract: An electric motor includes a stator including stator steel core (11) around which a coil is wound; a rotor which includes rotating body (30) that holds a plurality of permanent magnets (32) in the circumferential direction to face the stator, and shaft (16) that fastens rotating body (30) so as to penetrate the center of rotating body (30); a bearing (15) for supporting shaft (16); and bracket (17) for fixing bearing (15), wherein dielectric layer (50) is provided between shaft (16) and the outer periphery of rotating body (30).Type: GrantFiled: March 12, 2009Date of Patent: October 8, 2013Assignee: Panasonic CorporationInventors: Hirofumi Mizukami, Akihiko Watanabe
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Patent number: 8536756Abstract: A motor includes a stator having a stator iron-core on which a winding is wound, a rotor having a rotary body holding a permanent magnet opposed to the stator along a circumferential direction and a shaft joined to the rotary body such that it extends through the rotary body at the center, bearings supporting the shaft, two conductive brackets for fixing the bearings, and a printed circuit board on which a drive circuit for driving the winding is mounted. A dielectric layer is provided between an outer wall of the rotary body and the shaft, the two brackets are electrically connected together, and a capacitor is connected between the stator iron-core and the brackets for adjusting impedance.Type: GrantFiled: February 26, 2010Date of Patent: September 17, 2013Assignee: Panasonic CorporationInventors: Akihiko Watanabe, Hirofumi Mizukami, Takehiko Hasegawa, Haruhiko Kado
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Patent number: 8525374Abstract: Provided is an electric motor that has a stator including a stator iron core having a stator winding, a rotor including a rotary member and a shaft, a bearing for supporting the shaft, and a bracket for fixing the bearing. Further included is an impedance adjusting member for adjusting at least one impedance of the impedance between the stator winding and the inner ring of the bearing, and the impedance between the stator winding and the outer ring of the bearing. The impedance adjusting member is a matching member for matching the individual impedances. The matching member is a capacitor interposed between the stator iron core and the bracket.Type: GrantFiled: June 24, 2008Date of Patent: September 3, 2013Assignee: Panasonic CorporationInventors: Hirofumi Mizukami, Akihiko Watanabe
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Patent number: 8502427Abstract: A motor includes: a stator including a stator iron core on which a winding is wound; a rotor including a rotating body that holds a magnet in a circumferential direction to face the stator and a shaft that fastens the rotating body to penetrate a center of the rotating body; a bearing that supports the shaft; and two conductive brackets that fix the bearing. The two brackets are electrically connected to each other, and a capacitor serving as an impedance adjusting member that adjusts impedances between the stator iron core and the electrically connected two brackets is arranged.Type: GrantFiled: December 11, 2009Date of Patent: August 6, 2013Assignee: Panasonic CorporationInventors: Hirofumi Mizukami, Akihiko Watanabe, Takehiko Hasegawa, Haruhiko Kado
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Publication number: 20130043748Abstract: A stator, a rotor, bearings, and conductive brackets are provided. The stator has a stator iron core having a winding wound thereon. The rotor has a rotating body that holds a permanent magnet in the circumferential direction so that the permanent magnet faces the stator, and a shaft that has the rotating body fastened thereto so as to penetrate through the center of the rotating body. Both of the bearing on the output shaft side and the bearing opposite the output shaft side journal the shaft. One of the brackets fixes the bearing on the output shaft side, and the other of the brackets fixes the bracket opposite the output shaft side. The brackets are electrically connected to each other, and a dielectric layer is formed between the shaft and the outer periphery of the rotating body.Type: ApplicationFiled: May 12, 2010Publication date: February 21, 2013Applicant: PANASONIC CORPORATIONInventors: Hirofumi Mizukami, Akihiko Watanabe, Takehiko Hasegawa, Haruhiko Kado
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Patent number: 8242659Abstract: The mold commutator of the present invention comprises a plurality of commutator segments made of copper or copper alloy and circumferentially arranged, a plurality of spark absorbing elements, disposed between adjacent commutator segments, with paired parallel surfaces respectively having electrodes thereon, and a resin mold portion which integrates these portions into one piece. The spark absorbing element is electrically connected to the commutator segment via the electrode, and spark voltage generated at the commutator segment is absorbed by current flowing between the electrodes.Type: GrantFiled: April 8, 2008Date of Patent: August 14, 2012Assignee: Panasonic CorporationInventors: Noriteru Maeda, Hirofumi Mizukami, Akihiko Yamazaki, Seiji Kurozumi, Yoshikazu Yamagata
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Patent number: 8176619Abstract: A method of manufacturing a molded commutator for a vacuum cleaner motor, includes providing a cylindrical molding ring; arranging commutator segments in a circle along an inner periphery of the cylindrical molding ring such that grooves are formed between adjacent pairs of the commutator segments and the grooves are extended orthogonal to the rotating direction; press-fitting cylindrical varistors between the commutator segments, with a press-fitting load for each of the varistors ranging from 2 kN to 5 kN; and resin-molding the commutator segments and the varistors together with a molding material so as to maintain integral engagement of the commutator segments and the varistors; wherein the commutator segments are of copper alloy containing silver, and the varistors are of zinc oxide compounds; wherein side surfaces of the varistors contact with the adjacent pairs of commutator segments; and flexible metal is printed on the contacting side surfaces of the varistors.Type: GrantFiled: October 12, 2007Date of Patent: May 15, 2012Assignee: Panasonic CorporationInventors: Hirofumi Mizukami, Noriteru Maeda
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Publication number: 20120112588Abstract: Provided is an electric motor driven by an inverter of PWM method, and devised to retard electrolytic corrosion in a bearing. A rotating body of a rotor comprises an outer iron core configuring an outer peripheral portion of the rotating body, an inner iron core configuring an inner peripheral portion connected to a shaft, a dielectric layer disposed between the outer iron core and the inner iron core, a plurality of insertion holes penetrating the outer iron core in the axial direction, and permanent magnets inserted individually in the plurality of insertion holes. It thus becomes possible to increase impedance of the rotor side (inner ring side of bearing) to approximate it to impedance of the stator side (outer ring side of the bearing) to thereby bring high frequency potentials balanced between the inner ring side and the outer ring side of the bearing, so as to provide the electric motor that retards electrolytic corrosion liable to occur in the bearing, and an electric device equipped with the same.Type: ApplicationFiled: September 7, 2010Publication date: May 10, 2012Applicant: PANASONIC CORPORATIONInventors: Akihiko Watanabe, Takehiko Hasegawa, Hirofumi Mizukami, Haruhiko Kado, Genki Kondo
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Publication number: 20120038229Abstract: A motor includes a stator having a stator iron-core on which a winding is wound, a rotor having a rotary body holding a permanent magnet opposed to the stator along a circumferential direction and a shaft joined to the rotary body such that it extends through the rotary body at the center, bearings supporting the shaft, two conductive brackets for fixing the bearings, and a printed circuit board on which a drive circuit for driving the winding is mounted. A dielectric layer is provided between an outer wall of the rotary body and the shaft, the two brackets are electrically connected together, and a capacitor is connected between the stator iron-core and the brackets for adjusting impedance.Type: ApplicationFiled: February 26, 2010Publication date: February 16, 2012Applicant: PANASONIC CORPORATIONInventors: Akihiko Watanabe, Hirofumi Mizukami, Takehiko Hasegawa, Haruhiko Kado