Patents by Inventor Motomi Shimada
Motomi Shimada 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: 9350284Abstract: In a system for driving an electric motor by an engine generator, there is a possibility that oscillation and d-axis current are increased. In an engine generator system, a power converter (105) controls a generator (104) so that the phase of an oscillating component included in the d-axis current in the rotor magnetic flux direction of the generator (104) advances by 90 degrees or more with respect to the phase of an oscillating component of the identical frequency included in the rotating electric angular frequency of the generator (104), and further using q-axis voltage adjusting device (118) so that the phase of an oscillating component included in the q-axis current advances by 90 degrees or more with respect to the phase of an oscillating component of the identical frequency included in the rotating electric angular frequency of the generator (104).Type: GrantFiled: October 22, 2012Date of Patent: May 24, 2016Assignee: Hitachi, Ltd.Inventors: Toshifumi Sakai, Koichiro Nagata, Yoshitaka Iwaji, Motomi Shimada
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Patent number: 9108645Abstract: Provided is a high mobility railroad vehicle system configured to reciprocally carry out a direct drive between a non-electrically driven section and an electrically driven section without installing new facilities such as oil supply equipment and without considering distinction between the non-electrically and electrically driven sections. A railroad vehicle system is provided with an overall control apparatus to respectively control an external electric power supply means, an internal electric power supply means, an electricity storage means, electric power conversion means and a motor driving means. The railroad vehicle system judges or previously notifies as to whether the present driving railroad section is the electrically driven section or non-electrically driven section in accordance with driving position information received from a position information generation means such as a ground facility on a railroad equipped outside of the vehicle and a global positioning system (GPS).Type: GrantFiled: June 15, 2009Date of Patent: August 18, 2015Assignee: HITACHI, LTD.Inventors: Motomi Shimada, Takashi Kaneko, Kento Mochizuki, Seiji Ishida
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Patent number: 8963456Abstract: A power converter includes a first electric power conversion unit having an inverter for converting a first DC electric power to an AC electric power, an AC circuit connected to the first electric power conversion means; a second electric power conversion unit for receiving the first DC electric power and converting the same to a second DC electric power having a voltage level that differs from the voltage level of the first DC electric power, a power storage unit for storing the second DC electric power of the second electric power conversion unit; and a ripple suppressor having a first inductance for guiding the second DC electric power of the second electric power conversion unit to the power storage means and a second inductance for suppressing the ripple component included in the second DC electric power arranged between the second electric power conversion unit and the power storage unit.Type: GrantFiled: February 9, 2012Date of Patent: February 24, 2015Assignee: Hitachi, Ltd.Inventors: Tetsu Sugiura, Masahiro Nagasu, Motomi Shimada, Ryoichi Oishi, Tadanori Sato, Toshio Sekine
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Patent number: 8924051Abstract: A control device for a railway vehicle controls an inverter device based on a direct-current link voltage Vfc between the opposite terminals of a filter capacitor. A direct-current voltage applied to the inverter device during regeneration is the sum of a voltage Vb of power storage equipment and an overhead wire voltage Vs, so that only detecting the direct-current link voltage Vfc is not enough to separate the voltage Vb of the power storage equipment and the overhead wire voltage Vs from each other. The power storage equipment can be connected in series with the inverter device, and a voltage sensor that detects the overhead wire voltage Vs is provided between a current collector device and a grounding point. The power storage equipment is controlled based on the detection result from the voltage sensor.Type: GrantFiled: May 31, 2011Date of Patent: December 30, 2014Assignee: Hitachi, Ltd.Inventors: Daijiro Araki, Motomi Shimada, Shuichi Tachihara, Akira Horie, Masahiro Nagasu
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Publication number: 20140340005Abstract: In a system for driving an electric motor by an engine generator, there is a possibility that the effects of harmonics and DC voltage fluctuations of a power converter cause shaft oscillation to increase due to a phenomenon in which current pulsations caused by voltage disturbances at a d-axis and a q-axis are strengthened each other and thus oscillation and d-axis current are increased under the effect of interference between the d-axis and the q-axis.Type: ApplicationFiled: October 22, 2012Publication date: November 20, 2014Inventors: Toshifumi Sakai, Koichiro Nagata, Yoshitaka Iwaji, Motomi Shimada
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Patent number: 8825240Abstract: In order to minimize a calculation load and surely obtain a maximum adhesion torque, estimated adhesion torques are always stored, an maximum value is obtained from the stored plural estimated adhesion torques immediately before slip/skid is detected when detecting the slip/skid, and the maximum value is set as a maximum adhesion torque. The maximum adhesion torque immediately before the slip/skid is detected is compared with a value of the estimated adhesion torque when the slip/skid is detected. When the calculated value exceeds a threshold value, it is determined as a condition where an adhesion coefficient drastically drops, and a suppression/return ratio of the torque is switched to a lower value than that under a condition where the adhesion coefficient does not drastically drop. The value of the torque at the time of suppression or return is set to a smaller value to surely suppress the slip/skid.Type: GrantFiled: February 25, 2013Date of Patent: September 2, 2014Assignee: Hitachi, Ltd.Inventors: Atsushi Watanabe, Motomi Shimada, Toshihiro Aono, Shuichi Tachihara
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Patent number: 8816615Abstract: In a drive device for a railway vehicle, in which regeneration braking force is increased by adding the output voltage of a voltage adjustment device to a DC power source voltage, operation of the current control device is started prior to the start of the power running operation or the regeneration operation of the inverter device, and the operation of the current control device is stopped later than the stopping of the power running operation or the regeneration operation of the inverter device. Thereby, the current control device is surely operated at least during the operation period of the inverter device, so that the output voltage of the voltage adjustment device is adjusted by the current control device, to thereby prevent the over-discharge of the energy storage device at the time of power running operation or the overcharge of the energy storage device at the time of regeneration operation.Type: GrantFiled: August 10, 2012Date of Patent: August 26, 2014Assignee: Hitachi, Ltd.Inventors: Daijiro Araki, Motomi Shimada, Yoshihiro Miyaji, Keita Suzuki, Keishi Suzuki
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Publication number: 20130238176Abstract: In order to minimize a calculation load and surely obtain a maximum adhesion torque, estimated adhesion torques are always stored, an maximum value is obtained from the stored plural estimated adhesion torques immediately before slip/skid is detected when detecting the slip/skid, and the maximum value is set as a maximum adhesion torque. The maximum adhesion torque immediately before the slip/skid is detected is compared with a value of the estimated adhesion torque when the slip/skid is detected. When the calculated value exceeds a threshold value, it is determined as a condition where an adhesion coefficient drastically drops, and a suppression/return ratio of the torque is switched to a lower value than that under a condition where the adhesion coefficient does not drastically drop. The value of the torque at the time of suppression or return is set to a smaller value to surely suppress the slip/skid.Type: ApplicationFiled: February 25, 2013Publication date: September 12, 2013Applicant: HITACHI, LTD.Inventors: Atsushi WATANABE, Motomi SHIMADA, Toshihiro AONO, Shuichi TACHIHARA
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Publication number: 20130073125Abstract: A control device for a railway vehicle controls an inverter device based on a direct-current link voltage Vfc between the opposite terminals of a filter capacitor. A direct-current voltage applied to the inverter device during regeneration is the sum of a voltage Vb of power storage equipment and an overhead wire voltage Vs, so that only detecting the direct-current link voltage Vfc is not enough to separate the voltage Vb of the power storage equipment and the overhead wire voltage Vs from each other. The power storage equipment can be connected in series with the inverter device, and a voltage sensor that detects the overhead wire voltage Vs is provided between a current collector device and a grounding point. The power storage equipment is controlled based on the detection result from the voltage sensor.Type: ApplicationFiled: May 31, 2011Publication date: March 21, 2013Inventors: Daijiro Araki, Motomi Shimada, Shuichi Tachihara, Akira Horie, Masahiro Nagasu
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Publication number: 20130063055Abstract: In a drive device for a railway vehicle, in which regeneration braking force is increased by adding the output voltage of a voltage adjustment device to a DC power source voltage, operation of the current control device is started prior to the start of the power running operation or the regeneration operation of the inverter device, and the operation of the current control device is stopped later than the stopping of the power running operation or the regeneration operation of the inverter device. Thereby, the current control device is surely operated at least during the operation period of the inverter device, so that the output voltage of the voltage adjustment device is adjusted by the current control device, to thereby prevent the over-discharge of the energy storage device at the time of power running operation or the overcharge of the energy storage device at the time of regeneration operation.Type: ApplicationFiled: August 10, 2012Publication date: March 14, 2013Inventors: Daijiro ARAKI, Motomi Shimada, Yoshihiro Miyaji, Keita Suzuki, Keishi Suzuki
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Publication number: 20120229055Abstract: A power converter includes a first electric power conversion unit having an inverter for converting a first DC electric power to an AC electric power, an AC circuit connected to the first electric power conversion means; a second electric power conversion unit for receiving the first DC electric power and converting the same to a second DC electric power having a voltage level that differs from the voltage level of the first DC electric power, a power storage unit for storing the second DC electric power of the second electric power conversion unit; and a ripple suppressor having a first inductance for guiding the second DC electric power of the second electric power conversion unit to the power storage means and a second inductance for suppressing the ripple component included in the second DC electric power arranged between the second electric power conversion unit and the power storage unit.Type: ApplicationFiled: February 9, 2012Publication date: September 13, 2012Inventors: Tetsu SUGIURA, Masahiro Nagasu, Motomi Shimada, Ryoichi Oishi, Tadanori Sato, Toshio Sekine
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Publication number: 20120090499Abstract: Provided is a high mobility railroad vehicle system configured to reciprocally carry out a direct drive between a non-electrically driven section and an electrically driven section without installing new facilities such as oil supply equipment and without considering distinction between the non-electrically and electrically driven sections. A railroad vehicle system is provided with an overall control apparatus to respectively control an external electric power supply means, an internal electric power supply means, an electricity storage means, electric power conversion means and a motor driving means. The railroad vehicle system judges or previously notifies as to whether the present driving railroad section is the electrically driven section or non-electrically driven section in accordance with driving position information received from a position information generation means such as a ground facility on a railroad equipped outside of the vehicle and a global positioning system (GPS).Type: ApplicationFiled: June 15, 2009Publication date: April 19, 2012Inventors: Motomi Shimada, Takashi Kaneko, Kento Mochizuki, Seiji Ishida
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Patent number: 8120365Abstract: A power control apparatus for controlling charging and discharging of a plurality of storage devices, including a voltage measuring device for measuring voltages of the storage devices, a current measuring device for measuring currents flowing through the storage devices, a status detecting device for detecting the operating status of each of the storage devices from values measured by the voltage measuring device and the current measuring device, and a charging/discharging controlling device for controlling currents, voltages, or power according to the operating status of each storage device detected by the status detecting device to charge or discharge the storage devices.Type: GrantFiled: February 23, 2010Date of Patent: February 21, 2012Assignee: Hitachi, Ltd.Inventors: Akihiko Emori, Eiichi Toyota, Masato Suzuki, Motomi Shimada, Tsutomu Miyauchi, Takuya Kinoshita, Hideki Miyazaki
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Patent number: 7965056Abstract: The invention provides a control apparatus of a power conversion system for driving an induction motor via a VVVF inverter, wherein the AC voltage generated by the inverter is increased so as to expand the high-speed side property of the induction motor, to thereby improve the performance during power running and regenerative braking. In the present system, a DC power supply source having a power storage system with a capacity capable of processing the current flowing into or out of the inverter is inserted in series to the ground side of the input of the inverter, and the output voltage thereof is controlled from zero in a continuous manner to be added to the trolley voltage, which is then applied to the inverter.Type: GrantFiled: April 24, 2008Date of Patent: June 21, 2011Assignee: Hitachi, Ltd.Inventors: Mutsuhiro Terunuma, Eiichi Toyota, Motomi Shimada, Masahiro Nagasu
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Publication number: 20100148728Abstract: A power control apparatus for controlling charging and discharging of a plurality of storage devices, including a voltage measuring device for measuring voltages of the storage devices, a current measuring device for measuring currents flowing through the storage devices, a status detecting device for detecting the operating status of each of the storage devices from values measured by the voltage measuring device and the current measuring device, and a charging/discharging controlling device for controlling currents, voltages, or power according to the operating status of each storage device detected by the status detecting device to charge or discharge the storage devices.Type: ApplicationFiled: February 23, 2010Publication date: June 17, 2010Applicant: Hitachi, Ltd.Inventors: Akihiko Emori, Eiichi Toyota, Masato Suzuki, Motomi Shimada, Tsutomu Miyauchi, Takuya Kinoshita, Hideki Miyazaki
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Patent number: 7692430Abstract: A power control apparatus for controlling charging and discharging of a plurality of storage devices, including a voltage measuring device for measuring voltages of the storage devices, a current measuring device for measuring currents flowing through the storage devices, a status detecting device for detecting the operating status of each of the storage devices from values measured by the voltage measuring device and the current measuring device, and a charging/discharging controlling device for controlling currents, voltages, or power according to the operating status of each storage device detected by the status detecting device to charge or discharge the storage devices.Type: GrantFiled: November 29, 2007Date of Patent: April 6, 2010Assignee: Hitachi, Ltd.Inventors: Akihiko Emori, Eiichi Toyota, Masato Suzuki, Motomi Shimada, Tsutomu Miyauchi, Takuya Kinoshita, Hideki Miyazaki
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Patent number: 7466103Abstract: The invention provides a battery module including an output breaker that ensures safe and prompt installation of batteries in a system. The battery module includes one or more batteries and a case housing the batteries and having output terminals, each output terminal being connected to a positive or negative electrode of the housed battery, the battery module further including means for turning on and off the connection between the output terminal and the positive or negative electrode of the battery. The means for turning on and off the connection may include a contact subjected to making and breaking operations and a screw for making and breaking the contact, the screw having an insulator at an interface with the contact.Type: GrantFiled: December 15, 2005Date of Patent: December 16, 2008Assignee: Hitachi, Ltd.Inventors: Masato Suzuki, Eiichi Toyota, Motomi Shimada, Takashi Kaneko
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Publication number: 20080266920Abstract: The invention provides a control apparatus of a power conversion system for driving an induction motor via a VVVF inverter, wherein the AC voltage generated by the inverter is increased so as to expand the high-speed side property of the induction motor, to thereby improve the performance during power running and regenerative braking. In the present system, a DC power supply source having a power storage system with a capacity capable of processing the current flowing into or out of the inverter is inserted in series to the ground side of the input of the inverter, and the output voltage thereof is controlled from zero in a continuous manner to be added to the trolley voltage, which is then applied to the inverter.Type: ApplicationFiled: April 24, 2008Publication date: October 30, 2008Inventors: Mutsuhiro Terunuma, Eiichi Toyota, Motomi Shimada, Masahiro Nagasu
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Publication number: 20080084179Abstract: A power control apparatus for controlling charging and discharging of a plurality of storage means (101a, . . . ) has voltage measuring means (102a, . . . ) for measuring voltages of said storage means respectively, current measuring means (103a, . . . ) for measuring currents flowing through said storage means respectively, a status detecting means (104) for detecting the operating status of each storage means from values measured by said voltage measuring means and said current measuring means, and a charging/discharging controlling means (105) for controlling currents, voltages, or power according to the operating status of each storage means detected by said status detecting means to charge or discharge said storage means.Type: ApplicationFiled: November 29, 2007Publication date: April 10, 2008Applicant: Hitachi, Ltd.Inventors: Akihiko EMORI, Eiichi TOYOTA, Masato SUZUKI, Motomi SHIMADA, Tsutomu MIYAUCHI, Takuya KINOSHITA, Hideki MIYAZAKI
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Patent number: 7319333Abstract: A tracked vehicle has a power control apparatus for controlling charging and discharging of a plurality of storage devices. A voltage measuring device measures voltages of the respective storage devices, and a current measuring device measures currents flowing through the respective storage devices. A status detecting device detects the operating status of each storage device based on values measured by the voltage and current measuring devices; and a charging/discharging controlling device controls currents, voltages, or power according to the operating status of each storage device detected by the status detecting device, to charge or discharge the storage devices.Type: GrantFiled: January 9, 2006Date of Patent: January 15, 2008Assignee: Hitachi, Ltd.Inventors: Akihiko Emori, Eiichi Toyota, Masato Suzuki, Motomi Shimada, Tsutomu Miyauchi, Takuya Kinoshita, Hideki Miyazaki