Patents by Inventor Hiroshi Fujiwara
Hiroshi Fujiwara 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: 10236620Abstract: A seal ring mounting portion has: an outer circumferential surface portion that is provided so as to come into close contact with an inner circumferential portion of a seal ring, and extends along a circumferential direction of the seal ring in a state of being in close contact with the inner circumferential portion of the seal ring; and a holding portion that has a first wall portion provided on one width-direction side of the outer circumferential surface portion and a second wall portion provided on another width-direction side of the outer circumferential surface portion, the holding portion sandwiching and holding the seal ring from two sides in a width direction of the seal ring by the first wall portion and the second wall portion in the state of the seal ring being in close contact with the outer circumferential surface portion.Type: GrantFiled: August 2, 2017Date of Patent: March 19, 2019Assignee: J.S.T. MFG. CO., LTD.Inventors: Hironori Kono, Ryuji Kawaguchi, Seiji Yabuki, Hiroshi Fujiwara
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Patent number: 10197986Abstract: A method, according to the present invention, of adjusting control parameters used in a control apparatus of an electric motor includes the steps of: computing a first frequency characteristic (Step 1); computing a present speed-proportional gain range (Step 2); computing a present mechanical-system characteristic constant (Step 3); computing a present proportional gain range (Step 4); computing a secular characteristic (Step 5); computing a secular speed-proportional gain range (Step 6); computing a secular proportional gain range (Step 7); and selecting proportional gain values (Step 8).Type: GrantFiled: May 25, 2018Date of Patent: February 5, 2019Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Toru Tazawa, Hiroshi Fujiwara, Masaru Nishizono
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Publication number: 20180275628Abstract: A method, according to the present invention, of adjusting control parameters used in a control apparatus of an electric motor includes the steps of: computing a first frequency characteristic (Step 1); computing a present speed-proportional gain range (Step 2); computing a present mechanical-system characteristic constant (Step 3); computing a present proportional gain range (Step 4); computing a secular characteristic (Step 5); computing a secular speed-proportional gain range (Step 6); computing a secular proportional gain range (Step 7); and selecting proportional gain values (Step 8).Type: ApplicationFiled: May 25, 2018Publication date: September 27, 2018Inventors: Toru Tazawa, Hiroshi Fujiwara, Masaru Nishizono
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Patent number: 10007249Abstract: A method, according to the present invention, of adjusting control parameters used in a control apparatus of an electric motor includes the steps of: computing a first frequency characteristic (Step 1); computing a present speed-proportional gain range (Step 2); computing a present mechanical-system characteristic constant (Step 3); computing a present proportional gain range (Step 4); computing a secular characteristic (Step 5); computing a secular speed-proportional gain range (Step 6); computing a secular proportional gain range (Step 7); and selecting proportional gain values (Step 8).Type: GrantFiled: February 18, 2015Date of Patent: June 26, 2018Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Toru Tazawa, Hiroshi Fujiwara, Masaru Nishizono
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Patent number: 9975433Abstract: An electric vehicle controller includes an inverter that drives a motor by receiving power supplied from an overhead line, a brake chopper circuit that includes a switching device and a braking resistor and is connected in parallel with the inverter, a voltage detector that detects a bus voltage applied to DC buses, and a control unit that performs power consumption control of causing the braking resistor to consume regenerative power supplied from the motor and overvoltage suppression control of suppressing the bus voltage from being excessive. The control unit controls the switching device such that a second duty ratio used at the time of performing the overvoltage suppression control is lower than a first duty ratio used at the time of performing the power consumption control.Type: GrantFiled: August 25, 2014Date of Patent: May 22, 2018Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Hiroshi Fujiwara, Yuri Yamamoto, Yu Hirayama
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Publication number: 20180062303Abstract: A seal ring mounting portion has: an outer circumferential surface portion that is provided so as to come into close contact with an inner circumferential portion of a seal ring, and extends along a circumferential direction of the seal ring in a state of being in close contact with the inner circumferential portion of the seal ring; and a holding portion that has a first wail portion provided on one width-direction side of the outer circumferential surface portion and a second wall portion provided on another width-direction side of the outer circumferential surface portion, the holding portion sandwiching and holding the seal ring from two sides in a width direction of the seal ring by the first wall portion and the second wall portion in the state of the seal ring being in close contact with the outer circumferential surface portion.Type: ApplicationFiled: August 2, 2017Publication date: March 1, 2018Applicant: J.S.T. Mfg. Co., Ltd.Inventors: Hironori KONO, Ryuji KAWAGUCHI, Seiji YABUKI, Hiroshi FUJIWARA
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Publication number: 20170232847Abstract: An electric vehicle controller includes an inverter that drives a motor by receiving power supplied from an overhead line, a brake chopper circuit that includes a switching device and a braking resistor and is connected in parallel with the inverter, a voltage detector that detects a bus voltage applied to DC buses, and a control unit that performs power consumption control of causing the braking resistor to consume regenerative power supplied from the motor and overvoltage suppression control of suppressing the bus voltage from being excessive. The control unit controls the switching device such that a second duty ratio used at the time of performing the overvoltage suppression control is lower than a first duty ratio used at the time of performing the power consumption control.Type: ApplicationFiled: August 25, 2014Publication date: August 17, 2017Applicant: Mitsubishi Electric CorporationInventors: Hiroshi FUJIWARA, Yuri YAMAMOTO, Yu HIRAYAMA
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Patent number: 9525378Abstract: A motor control device of the present invention includes a position detector (107), a feedforward controller, a predistorter, a feedback controller, a vibration suppression controller, a torque controller, a torque estimator, and an adjustment calculator. The vibration suppression controller receives a manipulation-quantity command value derived by addition of a feedforward manipulation quantity and a feedback manipulation quantity, and outputs an actual manipulation-quantity command value corresponding to the received manipulation-quantity command value. The torque controller controls a manipulation quantity generated by the motor so that the manipulation quantity matches the actual manipulation-quantity command value. The adjustment calculator adjusts a transfer characteristic of the predistorter such that the transfer characteristic becomes equal to a transfer characteristic from the manipulation-quantity command value to the manipulation quantity.Type: GrantFiled: July 3, 2014Date of Patent: December 20, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventor: Hiroshi Fujiwara
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Publication number: 20160344326Abstract: A motor control device of the present invention includes a position detector (107), a feedforward controller, a predistorter, a feedback controller, a vibration suppression controller, a torque controller, a torque estimator, and an adjustment calculator. The vibration suppression controller receives a manipulation-quantity command value derived by addition of a feedforward manipulation quantity and a feedback manipulation quantity, and outputs an actual manipulation-quantity command value corresponding to the received manipulation-quantity command value. The torque controller controls a manipulation quantity generated by the motor so that the manipulation quantity matches the actual manipulation-quantity command value. The adjustment calculator adjusts a transfer characteristic of the predistorter such that the transfer characteristic becomes equal to a transfer characteristic from the manipulation-quantity command value to the manipulation quantity.Type: ApplicationFiled: July 3, 2014Publication date: November 24, 2016Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventor: HIROSHI FUJIWARA
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Publication number: 20160313721Abstract: A method, according to the present invention, of adjusting control parameters used in a control apparatus of an electric motor includes the steps of: computing a first frequency characteristic (Step 1); computing a present speed-proportional gain range (Step 2); computing a present mechanical-system characteristic constant (Step 3); computing a present proportional gain range (Step 4); computing a secular characteristic (Step 5); computing a secular speed-proportional gain range (Step 6); computing a secular proportional gain range (Step 7); and selecting proportional gain values (Step 8).Type: ApplicationFiled: February 18, 2015Publication date: October 27, 2016Applicant: Panasonic Intellecyual Property Management Co., LtInventors: TORU TAZAWA, HIROSHI FUJIWARA, MASARU NISHIZONO
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Publication number: 20160288845Abstract: A machine body has a front-rear direction and a right-left direction perpendicular to the front-rear direction. The machine body has right and left sides in the right-left direction. A cabin is mounted in the machine body between the right and left sides. Right and left traveling devices are arranged respectively on the right and left sides of the machine body. A boom has a front end part in the front-rear direction to be connected to a working tool. A first wall is provided on one side of the boom in the right-left direction. A second wall is provided on another side opposite to the one side with respect to the boom in the right-left direction. A urea aqueous solution tank is provided between the first and second walls to store a urea aqueous solution.Type: ApplicationFiled: March 30, 2016Publication date: October 6, 2016Applicant: Kubota CorporationInventors: Keigo HONDA, Hiroaki NAKAGAWA, Daisuke SAKURAI, Hiroshi FUJIWARA
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Patent number: 9423786Abstract: A motor drive device (2) of the present invention includes a command response setting unit (22), a position and speed controller (23), a load characteristic compensator (24), a servo adjuster (6), a command response setting function (221), a stiffness setting function (231), an evaluation indicator measuring function (27), and a storage (28). The servo adjuster (6) stores a plurality of command response indicators (61) and a plurality of stiffness indicators (62). The servo adjuster (6) also generates an evaluation indicator measuring pattern (63) by a combination of each command response indicator (61) and each stiffness indicator (62). A motor (3) is driven in accordance with the generated evaluation indicator measuring pattern (63) while the command response indicators (61) and the stiffness indicators (62) are sequentially changed.Type: GrantFiled: April 9, 2014Date of Patent: August 23, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Yu-Suke Imada, Kenichi Suzuki, Masaru Nishizono, Hiroshi Fujiwara
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Patent number: 9423782Abstract: Motor drive device (30) according to the present invention includes operation pattern generator (1), position and speed controller (23), load characteristic compensator (24), and load characteristic measurement unit (7). Operation pattern generator (1) increases an absolute value of acceleration, at which a motor speed or a motor position is changed, in each operation pattern. Load characteristic measurement unit (7) measures the load characteristic to set load characteristic compensator (24) when torque command indicator is less than or equal to a torque limit value. Load characteristic measurement unit (7) ends the measurement of the load characteristic without setting load characteristic compensator (24) when the torque command indicator is greater than the torque limit value.Type: GrantFiled: April 9, 2014Date of Patent: August 23, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Yu-suke Imada, Kenichi Suzuki, Masaru Nishizono, Hiroshi Fujiwara
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Patent number: 9366996Abstract: A sealing structure includes a housing to accommodate powder, a powder roller having a surface to bear and convey the powder, and an entrance seal disposed between the powder roller and the housing to allow powder remaining on a circumferential surface of the powder roller to enter the housing. A pair of left and right edge seals is provided in a circumferential direction of the powder roller to overlap with outer circumferential surfaces of both ends of the entrance seal, respectively. Both ends of the entrance seal include powder damming sections extended from both ends thereof along the pair of left and right edge seals, respectively. A pair of inner edges of the respective powder damming sections is each sandwiched between a corresponding one of the pair of left and right edge seals and the powder roller while substantially symmetrically inclining from the rotation direction of the powder roller.Type: GrantFiled: February 13, 2015Date of Patent: June 14, 2016Assignee: Ricoh Company, Ltd.Inventors: Akinori Harada, Tomohiro Kubota, Hiroshi Fujiwara
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Publication number: 20160070252Abstract: A motor drive device (2) of the present invention includes a command response setting unit (22), a position and speed controller (23), a load characteristic compensator (24), a servo adjuster (6), a command response setting function (221), a stiffness setting function (231), an evaluation indicator measuring function (27), and a storage (28). The servo adjuster (6) stores a plurality of command response indicators (61) and a plurality of stiffness indicators (62). The servo adjuster (6) also generates an evaluation indicator measuring pattern (63) by a combination of each command response indicator (61) and each stiffness indicator (62). A motor (3) is driven in accordance with the generated evaluation indicator measuring pattern (63) while the command response indicators (61) and the stiffness indicators (62) are sequentially changed.Type: ApplicationFiled: April 9, 2014Publication date: March 10, 2016Inventors: YU-SUKE IMADA, KENICHI SUZUKI, MASARU NISHIZONO, HIROSHI FUJIWARA
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Publication number: 20160048116Abstract: Motor drive device (30) according to the present invention includes operation pattern generator (1), position and speed controller (23), load characteristic compensator (24), and load characteristic measurement unit (7). Operation pattern generator (1) increases an absolute value of acceleration, at which a motor speed or a motor position is changed, in each operation pattern. Load characteristic measurement unit (7) measures the load characteristic to set load characteristic compensator (24) when torque command indicator is less than or equal to a torque limit value. Load characteristic measurement unit (7) ends the measurement of the load characteristic without setting load characteristic compensator (24) when the torque command indicator is greater than the torque limit value.Type: ApplicationFiled: April 9, 2014Publication date: February 18, 2016Inventors: YU-SUKE IMADA, KENICHI SUZUKI, MASARU NISHIZONO, HIROSHI FUJIWARA
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Publication number: 20150344727Abstract: A catalyst containing a quaternary ammonium salt represented by the following general formula (1) is used as a catalyst for dissociation of a blocking agent. [In the formula, each of R1 to R3 represents an aliphatic hydrocarbon group having 1 to 8 carbon atoms or an aromatic hydrocarbon group having 6 to 14 carbon atoms; R4 represents an aliphatic hydrocarbon group having 9 to 20 carbon atoms; X represents at least one member selected from the group consisting of a phosphate group, a borate group, a hydrogencarbonate group, a monoalkylcarbonate group and a carbonate group; a is an integer in the range of 1 to 3; and b is an integer in the range of 1 to 3.Type: ApplicationFiled: December 19, 2013Publication date: December 3, 2015Applicant: Tosoh CorporationInventors: Hiroshi FUJIWARA, Hiroyuki KISO
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Patent number: 9187280Abstract: A sheet feeding device includes a feeding device and a detector. The feeding device is configured to feed a sheet to a destination. The detector is configured to detect the sheet at the destination. If the detector does not detect the sheet within a predetermined time after the start of preparation for a feeding operation by the feeding device, it is determined that the sheet is misfed. Further, the start of the feeding operation of a sheet is changed in accordance with the result of detection by the detector of the presence or absence of a sheet standing by at the destination.Type: GrantFiled: December 7, 2011Date of Patent: November 17, 2015Assignee: Ricoh Company, Ltd.Inventors: Toshikane Nishii, Hiroshi Fujiwara, Tomoyoshi Yamazaki, Haruyuki Honda, Mizuna Tanaka
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Patent number: 9179842Abstract: An optical tomography device 1 is provided as one capable of obtaining tomographic information of a measuring object with higher accuracy. In the optical tomography device 1, numerical apertures of reception fibers 12, 13 are different from each other. Therefore, the device has a configuration wherein the reception fibers 12, 13 receive two kinds of respective light beams with different solid angle distributions, whereby the device can also obtain angular information, in addition to intensity information of light emerging from a measuring object 100. As a result, the accuracy is enhanced for an analysis about the tomographic information of the measuring object.Type: GrantFiled: May 9, 2012Date of Patent: November 10, 2015Assignees: Sumitomo Electric Industries, Ltd., Kyoto UniversityInventors: Haruo Nakaji, Hidenao Fukuyama, Yuusuke Iso, Shinichi Urayama, Naoya Oishi, Hiroshi Fujiwara
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Publication number: 20150234324Abstract: A sealing structure includes a housing to accommodate powder, a powder roller having a surface to bear and convey the powder, and an entrance seal disposed between the powder roller and the housing to allow powder remaining on a circumferential surface of the powder roller to enter the housing. A pair of left and right edge seals is provided in a circumferential direction of the powder roller to overlap with outer circumferential surfaces of both ends of the entrance seal, respectively. Both ends of the entrance seal include powder damming sections extended from both ends thereof along the pair of left and right edge seals, respectively. A pair of inner edges of the respective powder damming sections is each sandwiched between a corresponding one of the pair of left and right edge seals and the powder roller while substantially symmetrically inclining from the rotation direction of the powder roller.Type: ApplicationFiled: February 13, 2015Publication date: August 20, 2015Applicant: Ricoh Company, Ltd.Inventors: Akinori Harada, Tomohiro Kubota, Hiroshi Fujiwara