Patents by Inventor Keizo Shimada
Keizo 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: 8523296Abstract: An electric drive vehicle having an induction motor for braking or driving wheels, a motor controller for controlling the induction motor, and mechanical brakes for braking the wheels, wherein while the vehicle is in halt in a state that the mechanical breaks are not operating, the motor controller applies DC voltage or AC voltage in a frequency range of ?1 Hz to +1 Hz to the stator of the induction motor to make the induction motor generate torque for stopping the vehicle and maintain the vehicle in a halt state.Type: GrantFiled: January 26, 2007Date of Patent: September 3, 2013Assignee: Hitachi, Ltd.Inventors: Akira Kikuchi, Takashi Ikimi, Keizo Shimada, Naoshi Sugawara
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Patent number: 8151915Abstract: An electric drive vehicle having a power generator coupled to an engine, a first power converter connected with the power generator for converting the AC power generated by the power generator to DC power, a second power converter connected with the first power converter, for converting the DC power to AC power, a power consuming device for consuming the DC power, connected to a DC circuit between the first and second power converters, an electric motor connected with the second power converter, and at least one wheel driven by the electric motor, wherein the vehicle has a first control mode for controlling the output of the electric motor and a second control mode for controlling the power consumed by the power consuming device, and the second control mode performs such control that the operations of the second power converter and the electric motor in the first control mode are simulated.Type: GrantFiled: February 19, 2009Date of Patent: April 10, 2012Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Akira Kikuchi, Keizo Shimada, Kichio Nakajima, Toshikazu Minoshima, Tomohiko Yasuda, Takashi Ikimi
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Patent number: 7888894Abstract: An electric motor control system including a generator, an AC motor, a power converter for driving the AC motor using a DC output voltage of the generator, and an electric motor controller for controlling the power converter. The electric motor controller controls the power converter by predicting a change in the DC voltage.Type: GrantFiled: January 25, 2008Date of Patent: February 15, 2011Assignee: Hitachi, Ltd.Inventors: Naoshi Sugawara, Tetsuhiro Fujimoto, Yasuhiro Kiyofuji, Keizo Shimada, Akira Kikuchi, Kazuhiro Imaie
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Patent number: 7841434Abstract: In an electric drive system for a vehicle, an alternator is driven by an engine to generate electric power which is used to drive a motor to generate a driving force. During a retardation of the vehicle, the motor is operated as an alternator to convert kinetic energy to electric energy which is used to retard the vehicle. A retard resistor is provided for absorbing electric energy generated during the retardation state. The retard resistor is cooled down by an AC blower.Type: GrantFiled: May 11, 2009Date of Patent: November 30, 2010Assignees: Hitachi, Ltd., Hitachi Construction Machinery Co., Ltd.Inventors: Keizo Shimada, Yasuhiro Kiyofuji, Naoshi Sugawara, Kazuhiro Imaie, Shintarou Oku, Takashi Yagyu
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Publication number: 20090242294Abstract: An electric drive vehicle having a power generator coupled to an engine, a first power converter connected with the power generator for converting the AC power generated by the power generator to DC power, a second power converter connected with the first power converter, for converting the DC power to AC power, a power consuming device for consuming the DC power, connected to a DC circuit between the first and second power converters, an electric motor connected with the second power converter, and wheels driven by the electric motor, wherein the vehicle has a first control mode for controlling the output of the electric motor and a second control mode for controlling the power consumed by the power consuming device, and the second control mode performs such control that the operations of the second power converter and the electric motor in the first control mode are simulated.Type: ApplicationFiled: February 19, 2009Publication date: October 1, 2009Inventors: Akira Kikuchi, Keizo Shimada, Kichio Nakajima, Toshikazu Minoshima, Tomohiko Yasuda, Takashi Ikimi
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Publication number: 20090218966Abstract: In an electric drive system for a vehicle, an alternator is driven by an engine to generate electric power which is used to drive a motor to generate a driving force. During a retardation of the vehicle, the motor is operated as an alternator to convert kinetic energy to electric energy which is used to retard the vehicle. A retard resistor is provided for absorbing electric energy generated during the retardation state. The retard resistor is cooled down by an AC blower.Type: ApplicationFiled: May 11, 2009Publication date: September 3, 2009Inventors: Keizo SHIMADA, Yasuhiro Kiyofuji, Naoshi Sugawara, Kazuhiro Imaie, Shintarou Oku, Takashi Yagyu
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Patent number: 7583036Abstract: In an electrically driven vehicle having a controller, the vehicle has a steering angle sensor for outputting a detected value of a steering angle of the vehicle, the controller includes a first torque order pattern along which a torque order for a first electric motor is determined and a second torque order pattern along which a torque order for a second electric motor is determined, and the first and second torque order pattern are modified on the basis of the detected value of the steering angle so that the torque order determined along the second torque order pattern is greater than the torque order determined along the first torque order pattern under the identical velocity when the vehicle turns to the left, and the torque order determined along the first torque order pattern is greater than the torque order determined along the second torque order pattern under the identical velocity when the vehicle turns to the right.Type: GrantFiled: June 19, 2007Date of Patent: September 1, 2009Assignee: Hitachi, Ltd.Inventors: Akira Kikuchi, Takashi Ikimi, Keizo Shimada, Naoshi Sugawara
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Patent number: 7548439Abstract: By reduction in loss and noise of a three-phase reactor on the AC side of an electric power converter, compactness and reduction in weight of the reactor are realized, and countermeasures for heat and noise are reduced, and a specific frequency component is reduced, thus cost reduction and conversion efficiency are improved, and carriers of a controller are prepared in correspondence to the phases of the electric power converter, and moreover a phase difference of each carrier is set properly.Type: GrantFiled: March 30, 2005Date of Patent: June 16, 2009Assignee: Hitachi, Ltd.Inventors: Hikaru Meguro, Hiroshi Ikarashi, Keizo Shimada, Masashi Toyota
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Patent number: 7542312Abstract: By reduction in loss and noise of a three-phase reactor on the AC side of an electric power converter, compactness and reduction in weight of the reactor are realized, and countermeasures for heat and noise are reduced, and a specific frequency component is reduced, thus cost reduction and conversion efficiency are improved, and carriers of a controller are prepared in correspondence to the phases of the electric power converter, and moreover a phase difference of each carrier is set properly.Type: GrantFiled: June 4, 2007Date of Patent: June 2, 2009Assignee: Hitachi, Ltd.Inventors: Hikaru Meguro, Hiroshi Ikarashi, Keizo Shimada, Masashi Toyota
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Publication number: 20080179122Abstract: An electric motor control system including a generator, an AC motor, a power converter for driving the AC motor using a DC output voltage of the generator, and an electric motor controller for controlling the power converter. The electric motor controller controls the power converter by predicting a change in the DC voltage.Type: ApplicationFiled: January 25, 2008Publication date: July 31, 2008Inventors: Naoshi SUGAWARA, Tetsuhiro Fujimoto, Yasuhiro Kiyofuji, Keizo Shimada, Akira Kikuchi, Kazuhiro Imaie
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Publication number: 20080001558Abstract: In an electrically driven vehicle having a controller, the vehicle has a steering angle sensor for outputting a detected value of a steering angle of the vehicle, the controller includes a first torque order pattern along which a torque order for a first electric motor is determined and a second torque order pattern along which a torque order for a second electric motor is determined, and the first and second torque order pattern are modified on the basis of the detected value of the steering angle so that the torque order determined along the second torque order pattern is greater than the torque order determined along the first torque order pattern under the identical velocity when the vehicle turns to the left, and the torque order determined along the first torque order pattern is greater than the torque order determined along the second torque order pattern under the identical velocity when the vehicle turns to the right.Type: ApplicationFiled: June 19, 2007Publication date: January 3, 2008Inventors: Akira Kikuchi, Takashi Ikimi, Keizo Shimada, Naoshi Sugawara
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Patent number: 7315144Abstract: A motor is driven with variable frequency AC power converted from DC power, and an AC output power from the motor is converted to DC. In the conversion, an electromotive force regenerated by the motor is consumed by a plurality of resistors. When the consumption of the electromotive force is impeded in any of systems including any of the plurality of resistors, the electromotive force is consumed by the systems including the remaining resistors. Even if a system including any of the plurality of resistors fails, the electromotive force can by consumed by the other systems including the remaining resistors, thus providing a reliable rheostatic brake.Type: GrantFiled: February 16, 2006Date of Patent: January 1, 2008Assignees: Hitachi, Ltd., Hitachi Construction Machinery Co., Ltd.Inventors: Kazuhiro Imaie, Takashi Yagyu, Keizo Shimada, Yasuhiro Kiyofuji, Naoshi Sugawara
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Publication number: 20070230223Abstract: By reduction in loss and noise of a three-phase reactor on the AC side of an electric power converter, compactness and reduction in weight of the reactor are realized, and countermeasures for heat and noise are reduced, and a specific frequency component is reduced, thus cost reduction and conversion efficiency are improved, and carriers of a controller are prepared in correspondence to the phases of the electric power converter, and moreover a phase difference of each carrier is set properly.Type: ApplicationFiled: June 4, 2007Publication date: October 4, 2007Applicant: HITACHI, LTD.Inventors: Hikaru MEGURO, Hiroshi IKARASHI, Keizo SHIMADA, Masashi TOYOTA
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Publication number: 20070222288Abstract: An electric drive vehicle having an induction motor for braking or driving wheels, a motor controller for controlling the induction motor, and mechanical brakes for braking the wheels, wherein while the vehicle is in halt in a state that the mechanical breaks are not operating, the motor controller applies DC voltage or AC voltage in a frequency range of ?1 Hz to +1 Hz to the stator of the induction motor to make the induction motor generate torque for stopping the vehicle and maintain the vehicle in a halt state.Type: ApplicationFiled: January 26, 2007Publication date: September 27, 2007Inventors: Akira Kikuchi, Takashi Ikimi, Keizo Shimada, Naoshi Sugawara
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Publication number: 20060227583Abstract: By reduction in loss and noise of a three-phase reactor on the AC side of an electric power converter, compactness and reduction in weight of the reactor are realized, and countermeasures for heat and noise are reduced, and a specific frequency component is reduced, thus cost reduction and conversion efficiency are improved, and carriers of a controller are prepared in correspondence to the phases of the electric power converter, and moreover a phase difference of each carrier is set properly.Type: ApplicationFiled: March 30, 2005Publication date: October 12, 2006Applicant: Hitachi, Ltd.Inventors: Hikaru Meguro, Hiroshi Ikarashi, Keizo Shimada, Masashi Toyota
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Publication number: 20060221656Abstract: By reduction in loss and noise of a three-phase reactor on the AC side of an electric power converter, compactness and reduction in weight of the reactor are realized, and countermeasures for heat and noise are reduced, and a specific frequency component is reduced, thus cost reduction and conversion efficiency are improved, and carriers of a controller are prepared in correspondence to the phases of the electric power converter, and moreover a phase difference of each carrier is set properly.Type: ApplicationFiled: April 6, 2006Publication date: October 5, 2006Applicant: HITACHI , LTD.Inventors: Hikaru Meguro, Hiroshi Ikarashi, Keizo Shimada, Masashi Toyota
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Publication number: 20060181235Abstract: A motor is driven with variable frequency AC power converted from DC power, and an AC output power from the motor is converted to DC. In the conversion, an electromotive force regenerated by the motor is consumed by a plurality of resistors. When the consumption of the electromotive force is impeded in any of systems including any of the plurality of resistors, the electromotive force is consumed by the systems including the remaining resistors. Even if a system including any of the plurality of resistors fails, the electromotive force can by consumed by the other systems including the remaining resistors, thus providing a reliable rheostatic brake.Type: ApplicationFiled: February 16, 2006Publication date: August 17, 2006Inventors: Kazuhiro Imaie, Takashi Yagyu, Keizo Shimada, Yasuhiro Kiyofuji, Naoshi Sugawara
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Publication number: 20060086547Abstract: In an electric drive system for a vehicle, an alternator is driven by an engine to generate electric power which is used to drive a motor to generate a driving force. During a retardation of the vehicle, the motor is operated as an alternator to convert kinetic energy to electric energy which is used to retard the vehicle. A retard resistor is provided for absorbing electric energy generated during the retardation state. The retard resistor is cooled down by an AC blower.Type: ApplicationFiled: December 9, 2005Publication date: April 27, 2006Inventors: Keizo Shimada, Yasuhiro Kiyofuji, Naoshi Sugawara, Kazuhiro Imaie, Shintarou Oku, Takashi Yagyu
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Patent number: 7025514Abstract: A development apparatus for discharging a developer onto a surface of a semiconductor substrate (15) comprises a nozzle pipe (13) for supplying the developer, and a nozzle (14) having a shape of a spoon with a taper and discharging the developer supplied by the nozzle pipe onto the surface of the substrate. The nozzle sprays the developer onto the surface of the substrate at any spray angle under a low and constant pressure.Type: GrantFiled: October 2, 2003Date of Patent: April 11, 2006Assignee: Oki Electric Industry Co., Ltd.Inventors: Keizo Shimada, Yasuharu Ohta
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Publication number: 20040106298Abstract: A development apparatus for discharging a developer onto a surface of a semiconductor substrate (15) comprises a nozzle pipe (13) for supplying the developer, and a nozzle (14) having a shape of a spoon with a taper and discharging the developer supplied by the nozzle pipe onto the surface of the substrate. The nozzle sprays the developer onto the surface of the substrate at any spray angle under a low and constant pressure.Type: ApplicationFiled: October 2, 2003Publication date: June 3, 2004Inventors: Keizo Shimada, Yasuharu Ohta