Patents by Inventor Hideharu Hiwaki
Hideharu Hiwaki 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: 9973138Abstract: A brushless motor includes: a motor including a stator around which a winding wire is wound and a rotor holding a permanent magnet; a motor control microcomputer; an inverter circuit in which a power element is incorporated and controls an amount of a voltage applied to the winding wire; a temperature detecting element which detects a temperature of the power element; and a current detecting element which detects a power supply current or a current of the winding wire. A first current limit value is defined by current limit value which is set such that a junction temperature of the power element does not exceed a predetermined value, the brushless motor sets a second current limit value which is higher than the first current limit value, and the brushless motor operates, based on the second current limit value only in a predetermined period after start-up of the brushless motor.Type: GrantFiled: September 2, 2015Date of Patent: May 15, 2018Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Yoshikazu Sengokudani, Mitsuhiro Sakamoto, Hideharu Hiwaki
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Publication number: 20170214358Abstract: A brushless motor for a washing machine is provided, and the brushless motor includes: a motor including a stator around which a winding wire is wound and a rotor holding a permanent magnet; a motor control microcomputer; an inverter circuit in which a power element is incorporated and controls an amount of a voltage applied to the winding wire; a temperature detecting element which detects a temperature of the power element; and a current detecting element which detects a power supply current or a current of the winding wire. A first current limit value is defined by current limit value which is set such that a junction temperature of the power element does not exceed a predetermined value on a premise that the brushless motor performs a continuous operation, the brushless motor sets a second current limit value which is higher than the first current limit value, and the brushless motor operates, based on the second current limit value only in a predetermined period after start-up of the brushless motor.Type: ApplicationFiled: September 2, 2015Publication date: July 27, 2017Inventors: YOSHIKAZU SENGOKUDANI, MITSUHIRO SAKAMOTO, HIDEHARU HIWAKI
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Patent number: 9716417Abstract: Recesses and projections that extend in an axial direction are formed on an outer-circumferential surface of a molded resin body. The recesses are provided on portions where are extended outward from teeth having the winding and are on the outer circumferential surface. In addition, further recesses and projections that extend in a radial direction are formed on an axial-direction end surface of the molded resin body. The further recesses are provided on portions of the axial-direction end surface that are aligned in the axial direction with the winding.Type: GrantFiled: June 18, 2012Date of Patent: July 25, 2017Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Hideharu Hiwaki, Yuichiro Tashiro
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Patent number: 9698648Abstract: Recesses and projections that extend in an axial direction are formed on an outer-circumferential surface of a molded resin body. The recesses are provided on portions where are extended outward from the winding and are on the outer circumferential surface. In addition, further recesses and projections that extend in a radial direction are formed on an axial-direction end surface of the molded resin body. The further recesses are provided on portions of the axial-direction end surface that are aligned in the axial direction with the winding.Type: GrantFiled: June 14, 2012Date of Patent: July 4, 2017Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Yuichiro Tashiro, Hideharu Hiwaki
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Publication number: 20150249376Abstract: Recesses and projections that extend in an axial direction are formed on an outer-circumferential surface of a molded resin body. The recesses are provided on portions where are extended outward from teeth having the winding and are on the outer circumferential surface. In addition, further recesses and projections that extend in a radial direction are formed on an axial-direction end surface of the molded resin body. The further recesses are provided on portions of the axial-direction end surface that are aligned in the axial direction with the winding.Type: ApplicationFiled: June 18, 2012Publication date: September 3, 2015Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Hideharu Hiwaki, Yuichiro Tashiro
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Publication number: 20150155755Abstract: Recesses and projections that extend in an axial direction are formed on an outer-circumferential surface of a molded resin body. The recesses are provided on portions where are extended outward from the winding and are on the outer circumferential surface. In addition, further recesses and projections that extend in a radial direction are formed on an axial-direction end surface of the molded resin body. The further recesses are provided on portions of the axial-direction end surface that are aligned in the axial direction with the winding.Type: ApplicationFiled: June 14, 2012Publication date: June 4, 2015Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Yuichiro Tashiro, Hideharu Hiwaki
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Publication number: 20130055771Abstract: A brushless motor for washing machine of this invention is a motor suitable for application to a drum-type washing machine. The brushless motor for washing machine comprises a stator and a rotor. The stator includes a mounting section for fixing to a water tub, a stator core, a winding and a winding insulation material. The rotor includes a motor pulley for connection to a belt, a rotatably supported motor shaft, a rotor core and a magnet. At least one of the stator and the rotor has a mold portion formed of a resin material.Type: ApplicationFiled: July 20, 2011Publication date: March 7, 2013Applicant: PANASONIC CORPORATIONInventors: Yuichiro Tashiro, Hideaki Matsuo, Hideharu Hiwaki, Masahiko Morisaki
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Publication number: 20130042655Abstract: A brushless motor for washing machine applicable to a drum-type washing machine is provided with a rotary drum having an axis of rotation in a horizontal direction or an inclined direction, and power is transmitted to the rotary drum via a pulley and a belt. The brushless motor for washing machine comprises a stator and a rotor, and the rotor includes a rotor mold portion formed of a resin material on both end surfaces in an axial direction of a rotor core. The rotor mold portion has a resin protrusion projecting in an annular shape in the axial direction.Type: ApplicationFiled: July 20, 2011Publication date: February 21, 2013Applicant: PANASONIC CORPORATIONInventors: Hideaki Matsuo, Yuichiro Tashiro, Hideharu Hiwaki, Masahiko Morisaki
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Patent number: 7723877Abstract: A stator of a motor includes a stator core formed of a plurality of teeth and an annular yoke connecting the teeth to each other, and windings wound on the teeth. A rotor of the motor confronts the stator while supported rotatably, and includes a rotor magnet, a rotor core, and a position sensing magnet. The motor further includes a position sensor for sensing a rotational position of the rotor and a circuit board for supplying an electric current to the windings in response to the rotational position of the rotor. The rotor magnet, the rotor core, and the position sensing magnet are integrated into one unit, which is mounted on a shaft of the rotor.Type: GrantFiled: November 24, 2006Date of Patent: May 25, 2010Assignee: Panasonic CorporationInventors: Hideharu Hiwaki, Hiroshi Murakami, Kiyomi Kawamura
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Patent number: 7714474Abstract: In a stator core having “N” slots, a tooth-width centerline of a linear yoke and a first extension line extended horizontally from a center of rotary shaft toward the linear yoke form a first angle. Assume there are first point on the first extension line at a first distance from the center, a second extension line drawn at a second distance horizontally from the center toward the linear yoke and extended vertically toward arc-shaped yokes, and a third extension line drawn from the center toward teeth ends of the linear yokes with angle “K”. The second and third extension line intersect at a second point. A line between the first and second points intersects with the first extension line, thereby forming the first angle. In this structure, 0<a<b, and (360/2N?60/2N)°<K<(360/2N+60/2N)° are established, where “a”, “b” are the first and the second distances respectively.Type: GrantFiled: November 24, 2006Date of Patent: May 11, 2010Assignee: Panasonic CorporationInventors: Yuichi Yoshikawa, Yuichi Tanabe, Hiroshi Murakami, Hideharu Hiwaki, Koji Kuyama, Akio Ando
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Patent number: 7683518Abstract: A motor includes a stator formed of a stator iron-core having salient pole iron-cores and windings, and a rotor having a rotor iron-core in which permanent magnets are buried. A magnetic pole centerline connecting a rotary center of the rotor to a magnetic pole center crosses an external shape of the rotor iron-core at end point X, and the magnetic-pole boundary line connecting the rotary center to a magnetic pole boundary point crosses the external shape of the rotor iron-core at end point Z. A straight line angled at a given angle ?a from the magnetic pole centerline has end point A. Then a sectional view of the rotor iron-core shows an arc drawn between the end points X and A, and the arc's center is the rotary center. The end points A and Z are connected by one or more than one straight lines in series.Type: GrantFiled: February 28, 2007Date of Patent: March 23, 2010Assignee: Panasonic CorporationInventors: Yuichi Yoshikawa, Kiyomi Kawamura, Hiroshi Murakami, Hideharu Hiwaki, Yasushi Kamada, Hiroki Sato
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Publication number: 20090224628Abstract: A stator of a twin rotor motor includes: an annular yoke; a plurality of outer teeth and outer slots provided on an outer circumference of the yoke; a plurality of inner teeth and inner slots provided on an inner circumference of the yoke; and a plurality of toroidally-wound coils on the yoke. A rotor of the twin rotor motor includes: an outer rotor provided with an outer permanent magnet facing the outer teeth; and an inner rotor provided with an inner permanent magnet facing the inner teeth. Furthermore, the stator is provided with a resin mold that seals the coils and has a mounting-tab.Type: ApplicationFiled: February 13, 2006Publication date: September 10, 2009Inventors: Hideharu Hiwaki, Atsuyoshi Koshiba, Hiroshi Murakami
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Publication number: 20090134738Abstract: In a stator core having “N” slots, a tooth-width centerline of a linear yoke and a first extension line extended horizontally from a center of rotary shaft toward the linear yoke form a first angle. Assume there are first point on the first extension line at a first distance from the center, a second extension line drawn at a second distance horizontally from the center toward the linear yoke and extended vertically toward arc-shaped yokes, and a third extension line drawn from the center toward teeth ends of the linear yokes with angle “K”. The second and third extension line intersect at a second point. A line between the first and second points intersects with the first extension line, thereby forming the first angle. In this structure, 0<a<b, and (360/2N?60/2N)°<K<(360/2N+60/2N)° are established, where “a”, “b” are the first and the second distances respectively.Type: ApplicationFiled: November 24, 2006Publication date: May 28, 2009Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Yuichi Yoshikawa, Yuichi Tanabe, Hiroshi Murakami, Hideharu Hiwaki, Koji Kuyama, Akio Ando
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Publication number: 20090128075Abstract: A stator of a motor includes a stator core formed of a plurality of teeth and an annular yoke connecting the teeth to each other, and windings wound on the teeth. A rotor of the motor confronts the stator while supported rotatably, and includes a rotor magnet, a rotor core, and a position sensing magnet. The motor further includes a position sensor for sensing a rotational position of the rotor and a circuit board for supplying an electric current to the windings in response to the rotational position of the rotor. The rotor magnet, the rotor core, and the position sensing magnet are integrated into one unit, which is mounted on a shaft of the rotor.Type: ApplicationFiled: November 24, 2006Publication date: May 21, 2009Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Hideharu Hiwaki, Hiroshi Murakami, Kiyomi Kawamura
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Publication number: 20090091204Abstract: A motor includes a stator, a first rotor and a second rotor. The stator has a plurality of outer teeth projecting outward from an annular stator yoke, a plurality of inner teeth projecting inward from the stator yoke, and windings wound on both of the teeth. Instead of providing both of the teeth with the windings, toroidal windings can be wound on the stator yoke at each section sandwiched between the slots, which stator yoke is disposed between each one of the inner slots and corresponding each one of the outer slots. This motor is structured such that the phases of cogging torque and torque ripple existing between the stator and the second rotor can be reversed with respect to the phases of cogging torque and torque ripple existing between the stator and the first rotor.Type: ApplicationFiled: October 10, 2006Publication date: April 9, 2009Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Atsuyoshi Koshiba, Hideharu Hiwaki, Hirosi Murakami, Yuichi Yoshikawa
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Publication number: 20080203842Abstract: A motor includes a stator formed of a stator iron-core having salient pole iron-cores and windings, and a rotor having a rotor iron-core in which permanent magnets are buried. A magnetic pole centerline connecting a rotary center of the rotor to a magnetic pole center crosses an external shape of the rotor iron-core at end point X, and the magnetic-pole boundary line connecting the rotary center to a magnetic pole boundary point crosses the external shape of the rotor iron-core at end point Z. A straight line angled at a given angle ?a from the magnetic pole centerline has end point A. Then a sectional view of the rotor iron-core shows an arc drawn between the end points X and A, and the arc's center is the rotary center. The end points A and Z are connected by one or more than one straight lines in series.Type: ApplicationFiled: February 28, 2007Publication date: August 28, 2008Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Yuichi Yoshikawa, Kiyomi Kawamura, Hiroshi Murakami, Hideharu Hiwaki, Yasushi Kamada, Hiroki Sato
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Patent number: 6952064Abstract: It is intended to suppress the vibration and noise during operation of a concentrated winding electric motor and to provide an electric motor with high efficiency, low vibration and low noise. A skew is formed on at least one of a stator (10) and a rotor (20), arranged with a concentrated winding, and a winding vibration damping body (18) is inserted between windings (13) of different phases within a winding groove (19) and contacted therewith.Type: GrantFiled: July 11, 2002Date of Patent: October 4, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hideharu Hiwaki, Yoshinari Asano, Hisakazu Kataoka, Sunao Hashimoto, Shinichi Okuyama, Hiroshi Murakami
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Patent number: 6870293Abstract: To provide a motor which can suppress vibration and noise during an operation of a concentrated winding motor and can achieve low vibration and low noise with high efficiency. Skew is formed on at least one of a stator (10) provided with concentrated windings and a rotor (20), and the windings (13—13) of different phases in a groove (19) for windings are brought into contact with each other directly or via an insulating material.Type: GrantFiled: July 11, 2002Date of Patent: March 22, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hisakazu Kataoka, Hiroshi Murakami, Hideharu Hiwaki, Sunao Hashimoto, Yasuharu Odachi, Hirohito Hayashi
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Patent number: 6836051Abstract: A motor is provided that reduces vibration and noise by suppressing the vibration transmitted from a stator to a housing. Also an apparatus loaded with this motor is provided, that is highly efficient with less vibration and low noise. Notches formed at an outer circumference of a yoke are located on outer peripheral sides of slots, the notches are not in contact with the housing, the yoke located on outer circumferential sides of teeth is provided with axially penetrating through-holes, and an outer circumference of the stator core located on outer circumferential sides of the through-holes is in close contact with the housing, thus making it possible to obtain the motor with high efficiency, less vibration and low noise.Type: GrantFiled: December 3, 2003Date of Patent: December 28, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hideharu Hiwaki, Toshiyuki Tamamura, Haruhiko Kado, Hiroshi Itoh
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Publication number: 20040195926Abstract: It is intended to suppress the vibration and noise during operation of a concentrated winding electric motor and to provide an electric motor with high efficiency, low vibration and low noise. A skew is formed on at least one of a stator (10) and a rotor (20), arranged with a concentrated winding, and a winding vibration damping body (18) is inserted between windings (13) of different phases within a winding groove (19) and contacted therewith.Type: ApplicationFiled: May 19, 2004Publication date: October 7, 2004Inventors: Hideharu Hiwaki, Yoshinari Asano, Hisakazu Kataoka, Sunao Hashimoto, Shinichi Okuyama, Hiroshi Murakami