Patents by Inventor Naohide Maeda
Naohide Maeda 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: 11532974Abstract: In order to obtain an electric rotating machine which can improve rotating machine efficiency by suppressing a harmonic component of rotor magnetomotive force and reducing harmonic core loss, a permanent magnet is furnished in some of inter-magnetic pole portions, the inter-magnetic pole portion being formed between a first claw-shaped magnetic pole portion and a second claw-shaped magnetic pole portion; the shapes of a first chamfered portion and a second chamfered portion, which are provided in the inter-magnetic pole portion where the permanent magnet is inserted, differ from those of a first chamfered portion and a second chamfered portion, which are provided in an inter-magnetic pole portion where the permanent magnet is not inserted; and/or the shapes of a first magnetic flux adjusting portion and a second magnetic flux adjusting portion, which are provided in the inter-magnetic pole portion where the permanent magnet is inserted, differ from those of a first magnetic flux adjusting portion and a secondType: GrantFiled: November 3, 2020Date of Patent: December 20, 2022Assignee: Mitsubishi Electric CorporationInventors: Yuki Hidaka, Toshiyuki Yoshizawa, Naohide Maeda, Tadashi Murakami, Hiroyuki Higashino
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Publication number: 20220385157Abstract: In an electric rotating machine which can improve rotating machine efficiency by suppressing a harmonic component of rotor magnetomotive force and reducing harmonic core loss, a permanent magnet is furnished in some of inter-magnetic pole portions, the inter-magnetic pole portion being formed between a first claw-shaped magnetic pole portion and a second such pole portion; the shapes of first and second chamfered portions provided in the inter-magnetic pole portion where the permanent magnet is inserted, differ from those of first and second chamfered portions provided in an inter-magnetic pole portion having no permanent magnet inserted; or the shapes of a first and second magnetic flux adjusting portions provided in the inter-magnetic pole portion where the permanent magnet is inserted, differ from those of first and second magnetic flux adjusting portions provided in the inter-magnetic pole portion where no permanent magnet is inserted.Type: ApplicationFiled: August 9, 2022Publication date: December 1, 2022Applicant: Mitsubishi Electric CorporationInventors: Yuki HIDAKA, Toshiyuki YOSHIZAWA, Naohide MAEDA, Tadashi MURAKAMI, Hiroyuki HIGASHINO
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Publication number: 20220360145Abstract: With an object, of providing a rotating electric machine such that a reduction in size can be achieved, and a balance between a cooling performance and vibration resistance can be achieved, a multiple of connection portions formed of a first connection portion and a second connection portion that mechanically connect a rotating electric machine main body and a power converter are provided on a non-external device connection portion side bracket in the rotating electric machine main body and a heat dissipating member in the power converter, cross-sectional centers of the first connection portion and the second connection portion are caused to be positioned farther to an inner diameter side than an outer diameter of a stator, and a power module is disposed between two connection portions neighboring in a circumferential direction.Type: ApplicationFiled: December 20, 2021Publication date: November 10, 2022Applicant: Mitsubishi Electric CorporationInventors: Hiroyuki HIGASHINO, Yosuke UNO, Saburo TANAKA, Toshiaki KASHIHARA, Yoshinobu UTSUMI, Jun TAHARA, Hiroyuki YAHARA, Takaya MUTO, Shota MORIKAWA, Naohide MAEDA
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Publication number: 20210184519Abstract: In order to obtain an electric rotating machine which can improve rotating machine efficiency by suppressing a harmonic component of rotor magnetomotive force and reducing harmonic core loss, a permanent magnet is furnished in some of inter-magnetic pole portions, the inter-magnetic pole portion being formed between a first claw-shaped magnetic pole portion and a second claw-shaped magnetic pole portion; the shapes of a first chamfered portion and a second chamfered portion, which are provided in the inter-magnetic pole portion where the permanent magnet is inserted, differ from those of a first chamfered portion and a second chamfered portion, which are provided in an inter-magnetic pole portion where the permanent magnet is not inserted; and/or the shapes of a first magnetic flux adjusting portion and a second magnetic flux adjusting portion, which are provided in the inter-magnetic pole portion where the permanent magnet is inserted, differ from those of a first magnetic flux adjusting portion and a secondType: ApplicationFiled: November 3, 2020Publication date: June 17, 2021Applicant: Mitsubishi Electric CorporationInventors: Yuki HIDAKA, Toshiyuki Yoshizawa, Naohide Maeda, Tadashi Murakami, Hiroyuki Higashino
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Publication number: 20210184541Abstract: In order to provide an electric rotating machine which is inexpensive and miniaturized while improving cooling performance of a rotor, a power supply unit is fixed on the axial side of a shaft in a bracket and a permanent magnet is arranged adjacent to the advancing side in the rotation direction of a claw-shaped magnetic pole portion of a magnetic pole on the side where the power supply unit is provided.Type: ApplicationFiled: November 3, 2020Publication date: June 17, 2021Applicant: Mitsubishi Electric CorporationInventors: Tadashi MURAKAMI, Toshiyuki YOSHIZAWA, Naohide MAEDA, Jun TAHARA, Hiroyuki HIGASHINO, Yuki HIDAKA
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Patent number: 10069374Abstract: A rotary electric machine in accordance with the invention includes: a case including a front-side housing and a rear-side housing; a rotor having a field winding placed in the case; a stator having an armature winding placed in the case; a power module for energizing armature current that flows in the armature winding; a heat sink, on which the power module is mounted, for cooling the power module; a field circuit module for controlling field current that flows in the field winding; and a control circuit for controlling the operation of the power module and the field circuit module, wherein the power module includes a pair of power modules mounted opposite to each other on a base surface of the heat sink, and the heat sink includes a plurality of cooling fins placed thereon.Type: GrantFiled: October 25, 2011Date of Patent: September 4, 2018Assignee: Mitsubishi Electric CorporationInventors: Naohide Maeda, Masahiko Fujita
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Patent number: 9696178Abstract: Provided is a rotating electrical machine, including: temperature information acquisition means for acquiring information on a temperature of a brush; rotation information acquisition means for acquiring information on a rotation angle of a rotation shaft; and a wear amount calculation section for acquiring the temperature of the brush based on temperature information including output information of the temperature information acquisition means, and for calculating a total wear amount of the brush by integrating a product of a value corresponding to the temperature of the brush, the value being a wear amount function defined as a wear amount per unit sliding distance of the brush with the temperature of the brush used as a variable, and a value including an rotational speed of a rotor, with respect to time from immediately after start of use of the brush to a current time.Type: GrantFiled: December 10, 2010Date of Patent: July 4, 2017Assignee: Mitsubishi Electric CorporationInventors: Naohide Maeda, Masahiko Fujita
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Patent number: 9653969Abstract: To obtain a rotating electrical machine preventing a functional failure and shortening of the life of brushes caused by a temperature rise of the brushes installed to a vehicle AC power generator or a motor generator. A brush holder holding brushes supplying a field current to a rotor is provided with brush temperature suppressing metal members installed substantially parallel to the brushes in the vicinity of abutment portions of the brushes and slip rings in point-, line-, or surface-contact with the brushes at least at one point besides energization terminals. The brush temperature suppressing metal members not only diffuse heat generated at the brushes, but also function as a heat capacity for a case where a large amount of heat is generated in a short time, such as during regenerative power generation and a start-up operation, and thereby prevent an excessive temperature rise of the brushes.Type: GrantFiled: July 28, 2011Date of Patent: May 16, 2017Assignee: Mitsubishi Electric CorporationInventors: Tatsuya Fukase, Hitoshi Isoda, Naohide Maeda, Masahiko Fujita, Dai Nakajima
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Patent number: 9577495Abstract: A rotary electric machine including a brush used to supply a field current to a field winding of a rotor, a brush holder holding the brush, a power circuit portion connected to a heat sink having fins, and a case covering the power circuit portion and the brush holder. An air passage is provided between the brush holder and the fins of the heat sink, and an opening is provided to the case so as to cover component members of the brush holder in a shape conforming to an outer peripheral portion of the brush holder, from which cooling air is allowed to pass through the air passage.Type: GrantFiled: November 9, 2011Date of Patent: February 21, 2017Assignee: Mitsubishi Electric CorporationInventors: Tatsuya Fukase, Masahiko Fujita, Dai Nakajima, Hitoshi Isoda, Naohide Maeda
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Patent number: 9479029Abstract: An electric rotating machine is provided that efficiently radiates heat, caused in the vicinity of a portion where a brush and a slip ring makes contact with each other, to the outside of a brush holder and that can prevent the temperature of the brush from excessively rising. The brush holder holding the brush that supplies a magnetic-field current to a magnetic-field winding by way of the slip ring is provided with an energization terminal that electrically connects a magnetic-field circuit with the brush and a brush cooling metal member that cools the brush; the brush cooling metal member radiates heat, generated in the vicinity of a contact portion between the brush and the slip ring, to the outside of the brush holder.Type: GrantFiled: June 7, 2011Date of Patent: October 25, 2016Assignee: Mitsubishi Electric CorporationInventors: Tatsuya Fukase, Hitoshi Isoda, Naohide Maeda, Masahiko Fujita, Dai Nakajima
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Patent number: 9166460Abstract: Provided is a rotary electric machine including housings, a stator, a rotor, bearings, a slip ring, a power assembly, a control assembly, a rotation sensor, and a brush holder, in which a switching element mounting surface of the power assembly and a surface of the control assembly, on which a control element of a control circuit is mounted, are placed in parallel to a rotation shaft, and the rotation sensor is placed between the rear bearing and the slip ring.Type: GrantFiled: September 12, 2012Date of Patent: October 20, 2015Assignee: Mitsubishi Electric CorporationInventors: Naohide Maeda, Masahiko Fujita, Masaki Kato
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Patent number: 9143019Abstract: The rotating electric machine is configured in such a way that a surface of the heat sink, on which the cooling fins of the heat sink are formed, faces the housing; and a plate, which blocks the surface of the housing facing the heat sink and forms a wind passage between the heat sink and the plate, intervenes between the cooling fins and the surface of the housing facing the heat sink; and outside air is aspirated from an inlet formed on the protective cover, and then, the outside air is passed through the wind passage formed between the heat sink and the plate so as to be passed through a window formed on the housing, and is exhausted, by the cooling fan of the rotor, from an outlet formed on the housing.Type: GrantFiled: June 10, 2013Date of Patent: September 22, 2015Assignee: Mitsubishi Electric CorporationInventors: Naohide Maeda, Masahiko Fujita
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Publication number: 20140203675Abstract: The rotating electric machine is configured in such a way that a surface of the heat sink, on which the cooling fins of the heat sink are formed, faces the housing; and a plate, which blocks the surface of the housing facing the heat sink and forms a wind passage between the heat sink and the plate, intervenes between the cooling fins and the surface of the housing facing the heat sink; and outside air is aspirated from an inlet formed on the protective cover, and then, the outside air is passed through the wind passage formed between the heat sink and the plate so as to be passed through a window formed on the housing, and is exhausted, by the cooling fan of the rotor, from an outlet formed on the housing.Type: ApplicationFiled: June 10, 2013Publication date: July 24, 2014Inventors: Naohide MAEDA, Masahiko FUJITA
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Publication number: 20140125168Abstract: A rotary electric machine including a brush used to supply a field current to a field winding of a rotor, a brush holder holding the brush, a power circuit portion connected to a heat sink having fins, and a case covering the power circuit portion and the brush holder. An air passage is provided between the brush holder and the fins of the heat sink, and an opening is provided to the case so as to cover component members of the brush holder in a shape conforming to an outer peripheral portion of the brush holder, from which cooling air is allowed to pass through the air passage.Type: ApplicationFiled: November 9, 2011Publication date: May 8, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Tatsuya Fukase, Masahiko Fujita, Dai Nakajima, Hitoshi Isoda, Naohide Maeda
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Publication number: 20140070645Abstract: A rotary electric machine in accordance with the invention includes: a case including a front-side housing and a rear-side housing; a rotor having a field winding placed in the case; a stator having an armature winding placed in the case; a power module for energizing armature current that flows in the armature winding; a heat sink, on which the power module is mounted, for cooling the power module; a field circuit module for controlling field current that flows in the field winding; and a control circuit for controlling the operation of the power module and the field circuit module, wherein the power module includes a pair of power modules mounted opposite to each other on a base surface of the heat sink, and the heat. sink includes a plurality of cooling fins placed thereon.Type: ApplicationFiled: October 25, 2011Publication date: March 13, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Naohide Maeda, Masahiko Fujita
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Publication number: 20140035431Abstract: To obtain a rotating electrical machine preventing a functional failure and shortening of the life of brushes caused by a temperature rise of the brushes installed to a vehicle AC power generator or a motor generator. A brush holder holding brushes supplying a field current to a rotor is provided with brush temperature suppressing metal members installed substantially parallel to the brushes in the vicinity of abutment portions of the brushes and slip rings in point-, line-, or surface-contact with the brushes at least at one point besides energization terminals. The brush temperature suppressing metal members not only diffuse heat generated at the brushes, but also function as a heat capacity for a case where a large amount of heat is generated in a short time, such as during regenerative power generation and a start-up operation, and thereby prevent an excessive temperature rise of the brushes.Type: ApplicationFiled: July 28, 2011Publication date: February 6, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Tatsuya Fukase, Hitoshi Isoda, Naohide Maeda, Masahiko Fujita, Dai Nakajima
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Publication number: 20140001915Abstract: An electric rotating machine is provided that efficiently radiates heat, caused in the vicinity of a portion where a brush and a slip ring makes contact with each other, to the outside of a brush holder and that can prevent the temperature of the brush from excessively rising. The brush holder holding the brush that supplies a magnetic-field current to a magnetic-field winding by way of the slip ring is provided with an energization terminal that electrically connects a magnetic-field circuit with the brush and a brush cooling metal member that cools the brush; the brush cooling metal member radiates heat, generated in the vicinity of a contact portion between the brush and the slip ring, to the outside of the brush holder.Type: ApplicationFiled: June 7, 2011Publication date: January 2, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Tatsuya Fukase, Hitoshi Isoda, Naohide Maeda, Masahiko Fujita, Dai Nakajima
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Publication number: 20130334934Abstract: Provided is a rotary electric machine including housings, a stator, a rotor, bearings, a slip ring, a power assembly, a control assembly, a rotation sensor, and a brush holder, in which a switching element mounting surface of the power assembly and a surface of the control assembly, on which a control element of a control circuit is mounted, are placed in parallel to a rotation shaft, and the rotation sensor is placed between the rear bearing and the slip ring.Type: ApplicationFiled: September 12, 2012Publication date: December 19, 2013Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Naohide MAEDA, Masahiko FUJITA, Masaki KATO
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Publication number: 20130197821Abstract: Provided is a rotating electrical machine, including: temperature information acquisition means for acquiring information on a temperature of a brush; rotation information acquisition means for acquiring information on a rotation angle of a rotation shaft; and a wear amount calculation section for acquiring the temperature of the brush based on temperature information including output information of the temperature information acquisition means, and for calculating a total wear amount of the brush by integrating a product of a value corresponding to the temperature of the brush, the value being a wear amount function defined as a wear amount per unit sliding distance of the brush with the temperature of the brush used as a variable, and a value including an rotational speed of a rotor, with respect to time from immediately after start of use of the brush to a current time.Type: ApplicationFiled: December 10, 2010Publication date: August 1, 2013Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Naohide Maeda, Masahiko Fujita
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Patent number: 8212512Abstract: A vehicle generator motor has a generator motor that is connected to an internal combustion engine and plural sets of three-phase windings, plural sets of inverter portions connected to the respective sets of the three-phase windings, and a control circuit portion for controlling the inverter portions in accordance with the operation state of the generator motor. When the generator motor operates as a motor and a variation value of an output torque or power generation amount thereof exceeds a predetermined value, the control circuit portion controls the inverter portions so as to stop armature current flowing in at least one set in plural sets of three-phase windings.Type: GrantFiled: December 30, 2008Date of Patent: July 3, 2012Assignee: Mitsubishi Electric CorporationInventors: Naohide Maeda, Masahiko Fujita