Patents by Inventor Osamu Nakakita
Osamu Nakakita 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: 11916397Abstract: A combined electric power generations' supply system includes an AC power generator that supplies power by off grid independent operation, a DC power supply device, an inverter that converts DC power output by the DC power supply device into AC power. The rotation calculation unit calculates a value relating to a rotation of a rotor when driving the virtual power generator according to an active power command based on a rotor model calculates a value relating to the rotation of the rotor of the virtual power generator and the active power command. The output determination unit determines values relating to an active power and a reactive power to be output to the inverter based on the calculated value relating to the rotation. The modulation control unit performs control of a pulse width modulation of the inverter based on the determined value relating to the active power and reactive power.Type: GrantFiled: August 29, 2019Date of Patent: February 27, 2024Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Osamu Nakakita, Masayuki Tanaka, Hiroyuki Suzuki, Hirotaka Uehara, Masato Mitsuhashi, Fujio Eguchi
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Patent number: 11735925Abstract: A rotation calculation unit calculates a rotation speed of a virtual generator on the basis of a rotor model to simulate driving of the virtual generator and calculates the rotation speed of the virtual generator. A target power determination unit determines target values of active power and reactive power of an inverter on the basis of the calculated rotation speed. A command generation unit generates a control command for the inverter on the basis of the determined target values of the active power and the reactive power.Type: GrantFiled: September 13, 2019Date of Patent: August 22, 2023Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Kazuki Watanabe, Masato Mitsuhashi, Osamu Nakakita
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Publication number: 20220255320Abstract: This command generation device generates a control command for a power conversion device which converts DC power outputted by a DC power supply device to AC power and supplies the same to a bus, and which converts AC power from the bus to DC power and supplies the same to the DC power supply device.Type: ApplicationFiled: August 7, 2020Publication date: August 11, 2022Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Osamu NAKAKITA, Masayuki TANAKA, Masato MITSUHASHI, Fujio EGUCHI
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Publication number: 20220166224Abstract: A combined electric power generations' supply system includes an AC power generator that supplies power by off grid independent operation, a DC power supply device, an inverter that converts DC power output by the DC power supply device into AC power. The rotation calculation unit calculates a value relating to a rotation of a rotor when driving the virtual power generator according to an active power command based on a rotor model calculates a value relating to the rotation of the rotor of the virtual power generator and the active power command. The output determination unit determines values relating to an active power and a reactive power to be output to the inverter based on the calculated value relating to the rotation. The modulation control unit performs control of a pulse width modulation of the inverter based on the determined value relating to the active power and reactive power.Type: ApplicationFiled: August 29, 2019Publication date: May 26, 2022Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Osamu NAKAKITA, Masayuki TANAKA, Hiroyuki SUZUKI, Hirotaka UEHARA, Masato MITSUHASHI, Fujio EGUCHI
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Publication number: 20220109306Abstract: A processing unit of a command generation device which is provided separately from a general-purpose inverter, performs following processing. A rotation calculation unit calculates a value relating to a rotation of a rotor of a virtual power generator when the virtual power generator is driven according to an active power command based on a rotor model that simulates a driving of the virtual power generator and calculates a value relating to the rotation of the rotor of the virtual power generator and an active power command. A target determination unit determines a target value of a voltage frequency and a target value of an active power based on the calculated value relating to the rotation. A command generation unit generates a control command for the inverter based on the determined target value of the voltage frequency and the target value of the active power.Type: ApplicationFiled: August 29, 2019Publication date: April 7, 2022Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Osamu NAKAKITA, Masayuki TANAKA, Hiroyuki SUZUKI, Hirotaka UEHARA, Masato MITSUHASHI, Fujio EGUCHI
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Publication number: 20220102980Abstract: A rotation calculation unit calculates a rotation speed of a virtual generator on the basis of a rotor model to simulate driving of the virtual generator and calculates the rotation speed of the virtual generator. A target power determination unit determines target values of active power and reactive power of an inverter on the basis of the calculated rotation speed. A command generation unit generates a control command for the inverter on the basis of the determined target values of the active power and the reactive power.Type: ApplicationFiled: September 13, 2019Publication date: March 31, 2022Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Kazuki WATANABE, Masato MITSUHASHI, Osamu NAKAKITA
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Patent number: 9150396Abstract: The electric-vehicle control device is used in an electric vehicle which is provided with a vehicle body having a driving tire and an axle shaft and with a driving motor which imparts torque to the driving tire. The electric-vehicle control device issues a motor control command to the driving motor. The electric-vehicle control device is provided with a control unit, and the control unit gives feedback control to the driving motor by vibration parameters indicating vertical vibration of the electric vehicle at the center of the axle shaft.Type: GrantFiled: April 12, 2010Date of Patent: October 6, 2015Assignee: MITSUBISHI NICHIYU FORKLIFT CO., LTD.Inventors: Ryuichi Umehara, Osamu Nakakita, Masataka Kawaguchi, Toshiyuki Honda, Wataru Mizunuma
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Publication number: 20120185121Abstract: The electric-vehicle control device is used in an electric vehicle which is provided with a vehicle body having a driving tire and an axle shaft and with a driving motor which imparts torque to the driving tire. The electric-vehicle control device issues a motor control command to the driving motor. The electric-vehicle control device is provided with a control unit, and the control unit gives feedback control to the driving motor by vibration parameters indicating vertical vibration of the electric vehicle at the center of the axle shaft.Type: ApplicationFiled: April 12, 2010Publication date: July 19, 2012Inventors: Ryuichi Umehara, Osamu Nakakita, Masataka Kawaguchi, Toshiyuki Honda, Wataru Mizunuma
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Patent number: 8023281Abstract: An inverter apparatus is composed of an insulated metal substrate, a conductive stud, a printed circuit board, a conductive spacer, and a bus bar. An inverter output stage is mounted on the insulated metal substrate. The conductive stud is coupled to a main surface of the insulated metal substrate, and electrically connected with the inverter output stage. The printed circuit board is supported by the stud. The stud is coupled on the rear surface of the printed circuit board. Provided on the main surface of the printed circuit board is a circuit connected to the inverter output stage. The conductive spacer is coupled on the main surface of the printed circuit board, and electrically connected with the stud. The bus bar is coupled to the spacer.Type: GrantFiled: May 30, 2008Date of Patent: September 20, 2011Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Osamu Nakakita, Yoshimi Okazaki, Hiroyuki Yamazaki
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Patent number: 7906919Abstract: A slip control device, a slip control method, and a vehicle provided with such a slip control device are provided, with which the vehicle can travel stably even on a slippery road surface while maintaining good road holding. The device has torque directive control means (23) for calculating torque directives for the motors respectively based on accelerator pedal depressions (24) and steering angles (26) and outputting them to each of motor control sections (21, 22) of the motors, first reference speed calculation means (48) for calculating a first reference speed of one of the pair of left and right motors to be controlled based on rotation speed of the other motor, and restriction applying means (20) for applying restriction to each of the torque directives based on a permissible speed range determined for each of the motors by applying prescribed permissible speed deviation to each of the calculated reference speeds.Type: GrantFiled: October 25, 2007Date of Patent: March 15, 2011Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Mitsugu Nakamura, Osamu Nakakita, Yoshihide Iwamoto, Atsushi Nakao
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Patent number: 7554817Abstract: An inverter apparatus is composed of an insulated metal substrate, a conductive stud, a printed circuit board, a conductive spacer, and a bus bar. An inverter output stage is mounted on the insulated metal substrate. The conductive stud is coupled to a main surface of the insulated metal substrate, and electrically connected with the inverter output stage. The printed circuit board is supported by the stud. The stud is coupled on the rear surface of the printed circuit board. Provided on the main surface of the printed circuit board is a circuit connected to the inverter output stage. The conductive spacer is coupled on the main surface of the printed circuit board, and electrically connected with the stud. The bus bar is coupled to the spacer.Type: GrantFiled: January 24, 2006Date of Patent: June 30, 2009Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Osamu Nakakita, Yoshimi Okazaki, Hiroyuki Yamazaki
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Publication number: 20090026984Abstract: A slip control device, a slip control method, and a vehicle provided with such a slip control device are provided, with which the vehicle can travel stably even on a slippery road surface maintaining good road holding. The device is provided with a torque directive control means (23) for calculating torque directives for the motors respectively based on acceleration pedal depressions (24) and steering angles (26) and outputting them to each of motor control sections (21, 22) of the motors, a first reference speed calculation means (48) for calculating first reference speed of one of the pair of left and right motors to be controlled based on rotation speed of the other motor of the pair of motors, and a restriction putting means (20) for putting restriction to each of the torque directives sent from the torque directive control means (23) based on a permissible speed range determined for each of the motors by putting prescribed permissible speed deviation to each of the calculated reference speeds.Type: ApplicationFiled: October 25, 2007Publication date: January 29, 2009Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Mitsugu Nakamura, Osamu Nakakita, Yoshihide Iwamoto, Atsushi Nakao
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Publication number: 20080232073Abstract: An inverter apparatus is composed of an insulated metal substrate, a conductive stud, a printed circuit board, a conductive spacer, and a bus bar. An inverter output stage is mounted on the insulated metal substrate. The conductive stud is coupled to a main surface of the insulated metal substrate, and electrically connected with the inverter output stage. The printed circuit board is supported by the stud. The stud is coupled on the rear surface of the printed circuit board. Provided on the main surface of the printed circuit board is a circuit connected to the inverter output stage. The conductive spacer is coupled on the main surface of the printed circuit board, and electrically connected with the stud. The bus bar is coupled to the spacer.Type: ApplicationFiled: May 30, 2008Publication date: September 25, 2008Inventors: Osamu NAKAKITA, Yoshimi Okazaki, Hiroyuki YAMAZAKI
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Patent number: 7235948Abstract: A forklift having a cargo apparatus, the responsiveness of which to the operation by a user is improved. The forklift has: a DSP which generates a frequency instruction f* in response to the operation to a cargo apparatus operation lever, a voltage instruction V* from the frequency instruction f* by using the VVVF control, inverter control signals from the voltage instruction v*; an inverter which generates the three-phase electric power in response to the inverter control signal; a hydraulic pump; an induction motor driving a hydraulic pump by using the three-phase electric power; and a cargo apparatus which is driven by the hydraulic pressure supplied from the hydraulic pump.Type: GrantFiled: January 24, 2006Date of Patent: June 26, 2007Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Osamu Nakakita, Yoshimi Okazaki, Masayuki Morimoto, Takao Sakurai, Teruo Mizuno
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Patent number: 7222044Abstract: A rotating speed detecting apparatus has: a bearing sensor configured to detect rotation of a motor and output detection pulses whose frequency depending on a rotating speed of the motor; and a calculating unit configured to receive the detection pulses from the bearing sensor. The detection pulses include a first pulse and a second pulse output next to the first pulse. The calculating unit calculates a revolution of the motor from a pulse interval between the first pulse and the second pulse.Type: GrantFiled: January 24, 2006Date of Patent: May 22, 2007Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Osamu Nakakita, Masayuki Morimoto, Takao Sakurai, Mitsugu Nakamura
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Publication number: 20060192509Abstract: An inverter apparatus is composed of an insulated metal substrate, a conductive stud, a printed circuit board, a conductive spacer, and a bus bar. An inverter output stage is mounted on the insulated metal substrate. The conductive stud is coupled to a main surface of the insulated metal substrate, and electrically connected with the inverter output stage. The printed circuit board is supported by the stud. The stud is coupled on the rear surface of the printed circuit board. Provided on the main surface of the printed circuit board is a circuit connected to the inverter output stage. The conductive spacer is coupled on the main surface of the printed circuit board, and electrically connected with the stud. The bus bar is coupled to the spacer.Type: ApplicationFiled: January 24, 2006Publication date: August 31, 2006Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Osamu Nakakita, Yoshimi Okazaki, Hiroyuki Yamazaki
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Publication number: 20060192519Abstract: A forklift having a cargo apparatus, the responsiveness of which to the operation by a user is improved. The forklift has: a DSP which generates a frequency instruction f* in response to the operation to a cargo apparatus operation lever, a voltage instruction V* from the frequency instruction f* by using the VVVF control, inverter control signals from the voltage instruction v*; an inverter which generates the three-phase electric power in response to the inverter control signal; a hydraulic pump; an induction motor driving a hydraulic pump by using the three-phase electric power; and a cargo apparatus which is driven by the hydraulic pressure supplied from the hydraulic pump.Type: ApplicationFiled: January 24, 2006Publication date: August 31, 2006Applicant: Mitsubishi Heavy Industries, Ltd.Inventors: Osamu Nakakita, Yoshimi Okazaki, Masayuki Morimoto, Takao Sakurai, Teruo Mizuno
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Publication number: 20060190213Abstract: A rotating speed detecting apparatus has: a bearing sensor configured to detect rotation of a motor and output detection pulses whose frequency depending on a rotating speed of the motor; and a calculating unit configured to receive the detection pulses from the bearing sensor. The detection pulses include a first pulse and a second pulse output next to the first pulse. The calculating unit calculates a revolution of the motor from a pulse interval between the first pulse and the second pulse.Type: ApplicationFiled: January 24, 2006Publication date: August 24, 2006Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Osamu Nakakita, Masayuki Morimoto, Takao Sakurai, Mitsugu Nakamura
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Patent number: 6386305Abstract: A propulsion motor control apparatus for a battery vehicle including; a steering angle detection device for detecting a steering angle subtended between a common axis of two front wheels, and an axis of a rear wheel. Also included is a ratio computing device for computing a ratio between a distance between an intersection point of the two axes and a front wheel (outer wheel) on a side further from the intersection point, and a distance between the intersection point and a front wheel (inner wheel) on a side closer to the intersection point, based on the steering angle, a function determining device for determining a motor rotation speed/current command value function for the inner wheel based on a motor rotation speed/current command value function for the outer wheel and the obtained ratio, and a control device for individually controlling the respective propulsion motors for the two front wheels based on the two functions.Type: GrantFiled: February 25, 1999Date of Patent: May 14, 2002Assignee: Tsubishi Heavy Industries, Ltd.Inventors: Osamu Nakakita, Tatsuyuki Amamiya, Yoshimi Okazaki
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Publication number: 20020014360Abstract: The propulsion motor control apparatus for a battery vehicle of the invention comprises; a steering angle detection device for detecting a steering angle subtended between a common axis of two front wheels, and an axis of a rear wheel, a ratio computing device for computing a ratio between a distance between an intersection point of the two axes and a front wheel (outer wheel) on a side further from the intersection point, and a distance between the intersection point and a front wheel (inner wheel) on a side closer to the intersection point, based on the steering angle, a function determining device for obtaining a motor rotation speed/current command value function for the inner wheel based on a motor rotation speed/current command value function for the outer wheel and the obtained ratio, and a control device for individually controlling the respective propulsion motors for the two front wheels based on the two functions.Type: ApplicationFiled: February 25, 1999Publication date: February 7, 2002Inventors: OSAMU NAKAKITA, TATSUYUKI AMAMIYA, YOSHIMI OKAZAKI