Patents by Inventor Masahiko Fujita

Masahiko Fujita 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).

  • Patent number: 9425668
    Abstract: Provided is a control apparatus-integrated dynamoelectric machine in which, when an abnormality is found in a control apparatus in a final fabrication step, the control apparatus with the abnormality can be easily replaced by a normal one. The control apparatus-integrated dynamoelectric machine includes: a generator-motor portion including: a rotary shaft rotatably supported by a bracket; a rotor; a stator; and a rotation sensor; a control apparatus including: a DC-AC power interconverting circuit portion including: a power module for supplying AC power to a stator winding; and a field module for allowing a DC current to flow through a field winding; and a control circuit portion for controlling the DC-AC power interconverting circuit portion; and a connecting board provided outside of the bracket, for electrically connecting the control apparatus provided outside of the bracket and the generator-motor portion through a board terminal formed by insert molding.
    Type: Grant
    Filed: April 17, 2013
    Date of Patent: August 23, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tomoaki Shimano, Masahiko Fujita
  • Patent number: 9413209
    Abstract: A rotating electric machine including: a bracket holding a rotor and a stator of a motor; a heat sink provided fixedly to the bracket on an outside of the bracket; a resolver disposed between the heat sink and the motor; a stator circuit portion and a field circuit portion disposed to the heat sink on a side opposite to the resolver; and a control board supported on an insert case attached to the heat sink and electrically connected to the stator circuit portion and the field circuit portion. A resolver input-output terminal is electrically connected to the control board by passing through an insertion hole provided to the heat sink. The rotating electric machine configured in this manner is compact and inexpensive with an excellent heat-releasing performance and a capability of reducing man-hours required for assembly and components required for connection.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: August 9, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Naohiro Motoishi, Masahiko Fujita, Yoshinobu Utsumi
  • Patent number: 9394873
    Abstract: There is provided a vehicle starting apparatus that reduces vibration of an engine caused when the engine starts so that vibration of the vehicle can be decreased. A vehicle starting apparatus according to the present invention is provided with an engine starting apparatus that starts an engine mounted in a vehicle, wherein before the engine is ignited, the engine starting apparatus makes a cranking rotation speed of the engine lower than a rotation speed corresponding to the resonance frequency of the engine, and after the engine has been ignited, the engine starting apparatus increases the rotation speed of the engine up to a rotation speed that is the same as or higher than said rotation speed corresponding to the resonance frequency.
    Type: Grant
    Filed: September 7, 2011
    Date of Patent: July 19, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventor: Masahiko Fujita
  • Patent number: 9231516
    Abstract: Provided is a control device for a generator-motor including: a control section (111) for controlling a rotary electric machine (12) with use of an inverter (11); and a connection switch section (5) provided between a power source and the inverter, the connection switch section including a change-over contact (51) which is ON/OFF-controllable by the control section and a current reducing resistor (52) which are connected in parallel. The control section performs ON/OFF control of the change-over contact in accordance with drive characteristics of the rotary electric machine so that a drive current that flows when the rotary electric machine operates as a motor falls within a range not exceeding a permissible current value of the rotary electric machine.
    Type: Grant
    Filed: November 19, 2012
    Date of Patent: January 5, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tomoaki Shimano, Masahiko Fujita
  • Patent number: 9203288
    Abstract: A rotary electric machine with a power converter includes: a stator that has stator windings; a rotor that has a rotor winding; a rotational position detecting sensor that outputs a rotational position signal of the rotor; a case that contains the stator and the rotor; a field module that is connected to the rotor winding; power modules, each of which is connected to each of the stator windings and has a current detector, a first switching element, and a second switching element; a heat sink fixed to the field module and the power modules; and a control substrate that outputs control signals to the field module and the power modules based on the rotational position signal from the rotational position detecting sensor. The first switching element is connected in series to the second switching element; and the current detector and both switching element are molded with insulating resin.
    Type: Grant
    Filed: May 7, 2014
    Date of Patent: December 1, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masaki Kato, Masahiko Fujita
  • Publication number: 20150333667
    Abstract: A decrease of inductance in a carrier frequency region being used is suppressed by connecting reactors capable of maintaining a fluctuation range of inductance within a predetermined range in the carrier frequency region in series to and between an inverter device converting electric power of an energy storage device and an electric motor. Consequently, the electric motor is controlled while an iron loss and an electromagnetic noise are reduced independently of characteristics of an iron material and a magnetic steel sheet material used as a core material of the electric motor.
    Type: Application
    Filed: October 14, 2014
    Publication date: November 19, 2015
    Applicant: Mitsubishi Electic Corporation
    Inventors: Masahiko FUJITA, Yoshihiro TAKESHIMA, Masaki YAMADA
  • Patent number: 9166460
    Abstract: 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: Grant
    Filed: September 12, 2012
    Date of Patent: October 20, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Naohide Maeda, Masahiko Fujita, Masaki Kato
  • Publication number: 20150287670
    Abstract: According to a power semiconductor device of the present invention, it comprises a plurality of lead frames formed into like a wiring pattern, a power semiconductor element joined onto the lead frame, and a capacitor placed between mutually adjacent two lead frames, and is encapsulated with a mold resin. The capacitor is characterized in that external electrodes of that capacitor are connected to the lead frames each through a stress-relaxation structure portion that is lower in rigidity than the capacitor.
    Type: Application
    Filed: September 7, 2012
    Publication date: October 8, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tatsuya Fukase, Dai Nakajima, Masahiko Fujita, Masaki Kato
  • Patent number: 9143019
    Abstract: 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: Grant
    Filed: June 10, 2013
    Date of Patent: September 22, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Naohide Maeda, Masahiko Fujita
  • Patent number: 9136740
    Abstract: A controller-integrated electric rotating machine according to the present invention is provided with a heat sink on which a plurality of power modules included in an electric-power conversion circuit are mounted, a power-input/output conductor that is fixed to a bus bar electrically connected with a DC power source and is electrically connected with the DC power source and the bus bar, and a case, made of an insulator, that is fixed to the heat sink and is provided with a terminal that is electrically connected with the bus bar and the plurality of power modules; the bus bar is provided with a single electric connection portion and at least one mechanical connection portion other than the electric connection portion, electrically connected with the terminal by means of the single electric connection portion, and mechanically connected with the heat sink or the bracket through an insulating material by means of the at least one mechanical connection portion.
    Type: Grant
    Filed: December 13, 2010
    Date of Patent: September 15, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hitoshi Isoda, Masahiko Fujita
  • Publication number: 20150188395
    Abstract: A metal plate is insert-molded into a case so as to be exposed inside a B terminal mounting aperture so as to overlap with a busbar, a B terminal bolt is press-fitted from an opposite side from the busbar into a press-fitting aperture that is formed on the portion of the metal plate that is exposed inside the B terminal mounting aperture, a spacer and a nut are mounted onto a shaft portion of the B terminal bolt, and the nut is electrically connected to the busbar by the busbar being pressed and held between the spacer and the nut by a fastening force from the nut.
    Type: Application
    Filed: June 25, 2014
    Publication date: July 2, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masahiko FUJITA, Yoshinobu UTSUMI
  • Publication number: 20150162808
    Abstract: A rotary electric machine with a power converter includes: a stator that has stator windings; a rotor that has a rotor winding; a rotational position detecting sensor that outputs a rotational position signal of the rotor; a case that contains the stator and the rotor; a field module that is connected to the rotor winding; power modules, each of which is connected to each of the stator windings and has a current detector, a first switching element, and a second switching element; a heat sink fixed to the field module and the power modules; and a control substrate that outputs control signals to the field module and the power modules based on the rotational position signal from the rotational position detecting sensor. The first switching element is connected in series to the second switching element; and the current detector and both switching element are molded with insulating resin.
    Type: Application
    Filed: May 7, 2014
    Publication date: June 11, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masaki KATO, Masahiko FUJITA
  • Patent number: 9006879
    Abstract: The invention is to provide a semiconductor apparatus configured to position a semiconductor device reliably and easily without having a protruding portion formed in the bottom surface of the semiconductor device in the semiconductor apparatus. A semiconductor apparatus is fabricated by attaching a semiconductor device of a surface mount package type and a wiring member to a heat sink. A fitting portion in which the semiconductor device is fit is provided to the wiring member, so that the semiconductor device is positioned by fitting the semiconductor device into the fitting portion provided to the wiring member. According to the semiconductor apparatus of the invention, it becomes possible to position the semiconductor device at a high degree of accuracy.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: April 14, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masaki Kato, Masahiko Fujita, Kazuyasu Sakamoto
  • Patent number: 8970076
    Abstract: A first cooling air passage is formed to let first cooling air generated by a cooling fan in from a radially outside of an inverter apparatus to cool a heat sink and out through exhaust holes provided on an outer peripheral side of a rear bracket by passing an inner periphery of the rear bracket. Also, a second cooling air passage is formed to let second cooling air generated by the cooling fan into a hollow portion of the inverter apparatus from an axially rear of a rotation shaft to cool a brush holder and a magnetic pole position detection sensor and out through the exhaust holes by passing the inner periphery of the rear bracket. Hence, cooling performance for the magnetic pole position detection sensor and the brush holder may be enhanced and an axial dimension may be reduced.
    Type: Grant
    Filed: November 5, 2012
    Date of Patent: March 3, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hitoshi Isoda, Yoshinobu Utsumi, Masahiko Fujita
  • Publication number: 20150054363
    Abstract: An inverter device is provided with a hollow portion in a center portion of a rotation shaft of a rotating electrical machine. The rotating electrical machine has a first cooling air passage for cooling air generated by a cooling fan to flow in from an outer side in a radial direction of the rotating electrical machine, then to cool a heat sink, and to be discharged through ventilation holes provided to a rear bracket on an outer peripheral side by passing an inner periphery of the rear bracket, and a second cooling air passage for cooling air to flow into the hollow portion from the rear in the axial direction, then to cool a brush holder and a magnetic pole position detection sensor, and to be discharged through the ventilation holes by passing the inner periphery of the rear bracket.
    Type: Application
    Filed: November 21, 2013
    Publication date: February 26, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tomoaki SHIMANO, Masahiko Fujita
  • Publication number: 20140361648
    Abstract: Two or more switching devices (36) and two or more lead frames (41, 42, 43, and 44) are integrally molded by use of a molding resin (37) so that a power module (30) is formed; the power module (30) is made to adhere to a heat sink (32) via an insulating material (31); the power module (30) and the heat sink (32) are fixed to a housing (33) of the power module composite (23); the power module composite (23) is fixed to a case (6) of an electric rotating machine (1) via the housing (33).
    Type: Application
    Filed: April 16, 2012
    Publication date: December 11, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yuji Shirakata, Dai Nakajima, Masahiko Fujita, Masaki Kato
  • Publication number: 20140354087
    Abstract: A power module composite includes a power module (34) in which switching devices (32) included in an electric-power conversion circuit are molded, a driver module (37) that includes a control circuit (35) for controlling the switching devices (32) and is molded, a housing (39) containing the power module (34) and the driver module (37), and a heat sink (38) that is fixed to the housing (39) and refrigerates the switching devices (32); the power module 34 and the driver module 37 are mounted in that order on the heat sink (38) in such a way as to be superimposed on each other.
    Type: Application
    Filed: April 16, 2012
    Publication date: December 4, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masaki Kato, Masahiko Fujita
  • Patent number: 8853898
    Abstract: An object of the present invention is to provide an electrical rotating machine that prevents heat generated from a stator winding from being transmitted to an inverter circuit. A rotor having a field winding, and a stator having a stator winding arranged so as to surround the rotor are provided. One end of a rear bracket is connected to the stator, and arranged inside the rear bracket is a heat sink assembly including a heat sink having switching elements for controlling the field winding and the stator winding mounted thereto. The heat sink assembly is fixed to protruding portions protruding from an end surface of the rear bracket.
    Type: Grant
    Filed: October 28, 2009
    Date of Patent: October 7, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Atsushi Takechi, Masao Kikuchi, Hitoshi Isoda, Masaki Kato, Masahiko Fujita
  • Publication number: 20140203675
    Abstract: 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: Application
    Filed: June 10, 2013
    Publication date: July 24, 2014
    Inventors: Naohide MAEDA, Masahiko FUJITA
  • Publication number: 20140152130
    Abstract: Provided is a control apparatus-integrated dynamoelectric machine in which, when an abnormality is found in a control apparatus in a final fabrication step, the control apparatus with the abnormality can be easily replaced by a normal one. The control apparatus-integrated dynamoelectric machine includes: a generator-motor portion including: a rotary shaft rotatably supported by a bracket; a rotor; a stator; and a rotation sensor ; a control apparatus including: a DC-AC power interconverting circuit portion including: a power module for supplying AC power to a stator winding; and a field module for allowing a DC current to flow through a field winding; and a control circuit portion for controlling the DC-AC power interconverting circuit portion; and a connecting board provided outside of the bracket, for electrically connecting the control apparatus provided outside of the bracket and the generator-motor portion through a board terminal formed by insert molding.
    Type: Application
    Filed: April 17, 2013
    Publication date: June 5, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tomoaki SHIMANO, Masahiko FUJITA