Patents Assigned to Meidensha Corporation
  • Publication number: 20200169185
    Abstract: A controller for a power conversion circuit includes a first limiter for limiting a compensating voltage component within a compensating voltage switching level. A delay time measurement section measures an ON-delay time and an OFF-delay time, based on a binarized digital value and a PWM command value. A multiplier calculates an error voltage component average value by multiplying an average value of the ON-delay time and the OFF-delay time by a value that is obtained by dividing a direct-current power supply voltage by a half cycle of a triangular wave carrier signal. A second limiter extracts a component of the error voltage component average value that is beyond the compensating voltage switching level in absolute value. An adder sets a combined compensating voltage component to a sum of a limited compensating voltage component outputted by the first limiter and a limited error voltage component outputted by the second limiter.
    Type: Application
    Filed: March 19, 2018
    Publication date: May 28, 2020
    Applicant: MEIDENSHA CORPORATION
    Inventors: Yasuhiro YAMAMOTO, Shizunori HAMADA
  • Patent number: 10653024
    Abstract: A door opening and closing mechanism includes: a door configured to open and close a front side opening of a housing, wherein an electronic device is housed in the housing and is exposed through the front side opening; and an accommodation mechanism configured to accommodate the door in the housing when the door is in open state. The accommodation mechanism includes: an opening and closing action unit configured to cause an opening action and a closing action of the door; and a retracting action unit configured to retract the opening and closing action unit into the housing so as to accommodate the door in the housing, when the door is brought in open state by the opening and closing action unit.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: May 12, 2020
    Assignee: MEIDENSHA CORPORATION
    Inventors: Kunihiko Watanabe, Akihiko Kodama, Noboru Shiozawa, Makoto Miwa, Shigenori Ikeda
  • Patent number: 10651001
    Abstract: An emitter (3) and a target (7) are arranged so as to face each other in a vacuum chamber (1), and a guard electrode (5) is provided at an outer circumferential side of an electron generating portion (31) of the emitter (3). The emitter (3) is supported movably in both end directions of the vacuum chamber (1) by the emitter supporting unit (4) having a movable body (40). The emitter supporting unit (4) is operated by an operating unit (6) connected to the emitter supporting unit (4). By operating the emitter supporting unit (4) by the operating unit (6), a distance between the electron generating portion (31) of the emitter (3) and the target (7) is changed, and a position of the emitter (3) is fixed at an arbitrary distance, then field emission is performed with the position of the emitter (3) fixed.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: May 12, 2020
    Assignee: MEIDENSHA CORPORATION
    Inventors: Daizo Takahashi, Michihiro Hatanaka
  • Patent number: 10648890
    Abstract: A vehicle restraint apparatus is for restraining a vehicle 1 on one or more rollers 7 of a vehicle test system. The vehicle restraint apparatus 11 includes a vehicle restraining jig 12 to connect the vehicle 1 with a pole 10 on a floor 9, and a deflection absorbing mechanism 90 to absorb deflection of the vehicle restraining jig 12 produced at the time of vehicle test with the vehicle test system.
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: May 12, 2020
    Assignee: MEIDENSHA CORPORATION
    Inventors: Toshimichi Takahashi, Masao Furusawa
  • Patent number: 10620092
    Abstract: There has been a problem with operability when performing inertia verification, due to the fact that a setting window and a measurement result window are different. A setting display function section to set a setting value for measurement and a measurement result display function section that displays a result measured on the basis of the setting value are provided in one window on a display screen of an inertia verification device. The setting display function section has a setting value indicating section that indicates mechanical inertia, an operation condition setting section and a progress indicating section. The measurement result display function section has a monitor window indicating section and a measurement result indicating section.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: April 14, 2020
    Assignee: MEIDENSHA CORPORATION
    Inventor: Kenji Watanabe
  • Patent number: 10614969
    Abstract: Disclosed is a method for manufacturing an electrode material (1), wherein the electrode material includes: a center part (2) containing Cu, Cr and a heat resistant element and having superior large-current interruption and capacitor switching capabilities; and an outer circumferential part (3) disposed on an outer circumference of the center part (2). The outer circumferential part (3) contains Cu and Cr and has superior withstand voltage capability. The electrode material (1) is manufactured by molding a solid solution powder of Cr and the heat resistant element, molding a Cr powder integrally around an outer circumference of the molded body of the solid solution powder and infiltrating the integrally molded body with Cu etc.
    Type: Grant
    Filed: November 8, 2017
    Date of Patent: April 7, 2020
    Assignee: MEIDENSHA CORPORATION
    Inventors: Keita Ishikawa, Shota Hayashi, Hideaki Fukuda, Kosuke Hasegawa, Kenta Yamamura
  • Patent number: 10617030
    Abstract: When moving casing accommodating electronic equipment for maintenance of electronic equipment, stability of casing is maintained and safety is ensured. Casing separation mechanism 1 separates and connects a pair of casings 2a, 2b. A pair of rail portions 11 are set in bottom frame 21a of one casing 2a with rail portions 11 overhanging from frame 21a. A pair of rail portions 12 extend from one ends of rail portions 11 and retract into rail portions 11 so as to be able to stop during movement of rail portions 12 by rail movement mechanism. A pair of rail portions 13 are set in bottom frame 21b of other casing 2b with rail portions 13 overhanging from frame 21b, and extend from one ends of rail portions 12 and retract into rail portions 12 so as to be able to stop during movement of rail portions 13 by rail movement mechanism.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: April 7, 2020
    Assignee: MEIDENSHA CORPORATION
    Inventors: Nobuo Okazaki, Akihiko Kodama, Makoto Miwa, Shigenori Ikeda, Yoshio Kijima
  • Patent number: 10607801
    Abstract: Emitter (3) and target (7) are arranged so as to face each other in vacuum chamber (1), and guard electrode (5) is provided at outer circumferential side of electron generating portion (31) of emitter (3). Guard electrode (5) is supported movably in directions of both ends of vacuum chamber (1) by guard electrode supporting unit (6). To perform regeneration process of guard electrode (5), guard electrode (5) is moved to opening (22) side (to separate position) by operating guard electrode supporting unit (6), and a state in which field emission of electron generating portion (31) is suppressed is set, then by applying voltage across guard electrode (5), discharge is repeated. After performing regeneration process, by operating guard electrode supporting unit (6) again, guard electrode (5) is moved to opening (21) side (to emitter position), and a state in which field emission of electron generating portion (31) is possible is set.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: March 31, 2020
    Assignee: MEIDENSHA CORPORATION
    Inventors: Daizo Takahashi, Toshinori Tatsumi, Michihiro Hatanaka
  • Patent number: 10605689
    Abstract: A test piece characteristic estimation method includes estimating a moment of inertia of a test piece. A first transfer function G1 from a torque current command for a dynamometer to output from a shaft torque sensor is measured by vibrationally operating the dynamometer. A second transfer function G2 from the torque current command to the output of a dynamo rotation speed sensor is measured by vibrationally operating the dynamometer. A real part and an imaginary part of a ratio obtained by dividing the second transfer function G2 by the first transfer function G1 at a prescribed measurement frequency ?k are calculated. A moment of inertia Jeg and a rotational friction Ceg are estimated by using the real part and the imaginary part of the ratio.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: March 31, 2020
    Assignee: MEIDENSHA CORPORATION
    Inventor: Takao Akiyama
  • Patent number: 10591370
    Abstract: A dynamometer (5) in a dynamometer device (1) is assembled on the top of a dynamometer-side bed (6), and the dynamometer-side bed (6) is removably attached to a tank-side bed (15) located on the top part of a bed tank (3). Consequently, at the time of the disassembling of the dynamometer device (1) for maintenance or the like, it is possible to easily separate a dynamo body (4) and the bed tank (3) from one another by simply taking down the dynamometer-side bed (6) from the tank-side bed (15).
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: March 17, 2020
    Assignee: MEIDENSHA CORPORATION
    Inventors: Takahiro Shimizu, Shigeo Watanabe
  • Patent number: 10574163
    Abstract: Current control section 2 performs PI control based on deviation between d-axis command current Id_cmd and d-axis detected current Id_det and deviation between q-axis command current Iq_cmd and q-axis detected current Iq_det. Neutral point potential control section 4 calculates corrected command voltage V_cmd? by addition of neutral point control compensation quantity V_cmp to three-phase command voltage V_cmd. Limiter LMT3 outputs limiter processed command voltage V_cmd? by liming the output of corrected command voltage V_cmd?. Three-phase to two-phase converter 5 outputs feedback quantities Vd_back, Vq_back by three-phase to two-phase conversion of the limiter processed command voltage V_cmd?. Current control section 2 performs integral control in accordance with quantities resulting from addition of the feedback quantities Vd_back, Vq_back to the deviations.
    Type: Grant
    Filed: October 7, 2015
    Date of Patent: February 25, 2020
    Assignee: MEIDENSHA CORPORATION
    Inventors: Shizunori Hamada, Kenji Kobori
  • Patent number: 10558176
    Abstract: A control system comprising a feedback controller 1 for determining an operation amount u in a control-implemented system based on a command value r*, a detection value y of the control-implemented system and phase information ? for the control-implemented system, wherein the feedback controller 1 has a periodic disturbance suppression controller 4 for outputting a periodic disturbance compensation signal rpd* based on the detection value y and the phase information ?; and a resonance/disturbance suppression controller 3 for calculating the operation amount u based on the detection value y and a corrected command value r obtained by adding the periodic disturbance compensation signal rpd* to the command value r*. The periodic disturbance suppression controller 4 uses a generalized periodic disturbance observer. In the control system, resonance, non-periodic disturbances and periodic disturbances are all suppressed in order to raise the system control performance.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: February 11, 2020
    Assignee: Meidensha Corporation
    Inventors: Yugo Tadano, Masakatsu Nomura
  • Publication number: 20200044508
    Abstract: A coil support (28) is configured to include a coil support body part (281) that is made of resin and that has abutment surfaces (281c, 281d) to be in respective direct abutments with radial inner surfaces of adjoining field windings (24) and an insertion hole (281a) that is formed along a radial direction of a rotary shaft (21), a bolt (282) with a hexagonal hole that has a base end part fixed to a rotor yoke (22) and a tip end part projecting outward in a radial direction and that is inserted into the insertion hole (281a) of the coil support body part (281), and a disc spring (283) that is interposed between the rotor yoke (22) and the coil support body part (281) and that presses the coil support body part (281) toward the field windings (24), and to have a spot-faced part (281b) that is formed on a radial outside of the insertion hole (281a) to have a larger diameter than the insertion hole (281a).
    Type: Application
    Filed: March 6, 2018
    Publication date: February 6, 2020
    Applicant: MEIDENSHA CORPORATION
    Inventor: Yuji OGAWA
  • Publication number: 20200021156
    Abstract: To cool field winding from its inner peripheral side and increase an insulation performance, salient-pole rotor (3) has rotor yoke (12) provided along rotation shaft (11), magnetic cores (13) protruding outward in radial direction from outer peripheral portion of rotor yoke (12) and arranged at regular intervals in circumferential direction, magnetic head (14) provided at radial direction outer side of magnetic core (13), and field winding (15) wound around outer peripheral surface of magnetic core (13) between rotor yoke (12) and magnetic head (14). And, insulating structure of ventilation path of salient-pole rotor (3) has ventilation groove (15a) opening to inner peripheral surface of field winding (15) and penetrating field winding (15) in radial direction, ventilation hole (14a) penetrating magnetic head (14) in radial direction and communicating with ventilation groove (15a), and stepped portion (15b) formed at portion, at magnetic head (14) side, of ventilation groove (15a).
    Type: Application
    Filed: March 5, 2018
    Publication date: January 16, 2020
    Applicant: MEIDENSHA CORPORATION
    Inventor: Kenichi TAIRA
  • Patent number: 10511242
    Abstract: When it is not possible for a power generation device to operate coupled to an electric power system, an autonomous operation of connection and disconnection of a load of the power generation device is performed along an efficiency-characteristics curve within a speed range from a rated speed to a maximum speed in the efficiency-characteristics curve of an energy source. During the autonomous operation, an aperture command is outputted to an inlet valve of a water turbine and a first converter is operated in a converter mode when an operation preparation command is outputted by a control unit, a second converter is operated in an inverter mode when a voltage is established by of a DC linkage unit, and the load is connected when the operation preparation is completed.
    Type: Grant
    Filed: July 27, 2015
    Date of Patent: December 17, 2019
    Assignee: MEIDENSHA CORPORATION
    Inventor: Toshitake Masuko
  • Patent number: 10502645
    Abstract: In a dynamometer device (1), a dynamometer (5) is placed on a dynamometer-side bed (6), and the dynamometer-side bed (6) is stacked on a tank-side bed (15) located on the top part of a bed tank (3). The dynamometer (5) is connected to the bed tank (3) by an oil discharge pipe (9) which returns a cooling oil (2) to the bed tank (3) from the dynamometer (5). The oil discharge pipe (9) passes through an interface (23) between the dynamometer-side bed (6) and the tank-side bed (15), and extends into the bed tank (3).
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: December 10, 2019
    Assignee: MEIDENSHA CORPORATION
    Inventors: Takahiro Shimizu, Shigeo Watanabe
  • Publication number: 20190362910
    Abstract: Disclosed is a method for manufacturing an electrode material (1), wherein the electrode material includes: a center part (2) containing Cu, Cr and a heat resistant element and having superior large-current interruption and capacitor switching capabilities; and an outer circumferential part (3) disposed on an outer circumference of the center part (2). The outer circumferential part (3) contains Cu and Cr and has superior withstand voltage capability. The electrode material (1) is manufactured by molding a solid solution powder of Cr and the heat resistant element, molding a Cr powder integrally around an outer circumference of the molded body of the solid solution powder and infiltrating the integrally molded body with Cu etc.
    Type: Application
    Filed: November 8, 2017
    Publication date: November 28, 2019
    Applicant: MEIDENSHA CORPORATION
    Inventors: Keita ISHIKAWA, Shota HAYASHI, Hideaki FUKUDA, Kosuke HASEGAWA, Kenta YAMAMURA
  • Publication number: 20190364678
    Abstract: A door opening and closing mechanism includes: a door configured to open and close a front side opening of a housing, wherein an electronic device is housed in the housing and is exposed through the front side opening; and an accommodation mechanism configured to accommodate the door in the housing when the door is in open state. The accommodation mechanism includes: an opening and closing action unit configured to cause an opening action and a closing action of the door; and a retracting action unit configured to retract the opening and closing action unit into the housing so as to accommodate the door in the housing, when the door is brought in open state by the opening and closing action unit.
    Type: Application
    Filed: May 23, 2017
    Publication date: November 28, 2019
    Applicant: MEIDENSHA CORPORATION
    Inventors: Kunihiko WATANABE, Akihiko KODAMA, Noboru SHIOZAWA, Makoto MIWA, Shigenori IKEDA
  • Patent number: 10490367
    Abstract: It is a method for manufacturing an electrode material containing Cu, Cr, a heat-resistant element, and a low melting metal. A Cr powder and a heat-resistant element powder are mixed together in a ratio such that the Cr is greater than the heat-resistant element by weight. The mixed powder of the heat-resistant element and the Cr powder is baked. A MoCr solid solution obtained by the baking and containing a solid solution of the heat-resistant element and the Cr is pulverized and then classified. The classified MoCr solid solution powder, a Cu powder, and a low-melting metal powder are mixed together, followed by sintering at a temperature that is 1010° C. or higher and is lower than 1038° C., thereby obtaining the electrode material.
    Type: Grant
    Filed: June 21, 2016
    Date of Patent: November 26, 2019
    Assignee: MEIDENSHA CORPORATION
    Inventors: Shota Hayashi, Keita Ishikawa, Kenta Yamamura, Kosuke Hasegawa
  • Publication number: 20190341218
    Abstract: Emitter (3) and target (7) are arranged so as to face each other in vacuum chamber (1), and guard electrode (5) is provided at outer circumferential side of electron generating portion (31) of emitter (3). Guard electrode (5) is supported movably in directions of both ends of vacuum chamber (1) by guard electrode supporting unit (6). To perform regeneration process of guard electrode (5), guard electrode (5) is moved to opening (22) side (to separate position) by operating guard electrode supporting unit (6), and a state in which field emission of electron generating portion (31) is suppressed is set, then by applying voltage across guard electrode (5), discharge is repeated. After performing regeneration process, by operating guard electrode supporting unit (6) again, guard electrode (5) is moved to opening (21) side (to emitter position), and a state in which field emission of electron generating portion (31) is possible is set.
    Type: Application
    Filed: March 16, 2017
    Publication date: November 7, 2019
    Applicant: MEIDENSHA CORPORATION
    Inventors: Daizo TAKAHASHI, Toshinori TATSUMI, Michihiro HATANAKA