Patents by Inventor Takeshi Tomizaki
Takeshi Tomizaki 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: 10985678Abstract: A motor control apparatus includes: a motor drive control section that controls driving of a motor using a predetermined phase; a rotation position detecting section that, at every 180 degrees of an electrical angle of the motor, outputs two kinds of detection signals according to the rotation position of the rotor of the motor; a stopped position estimating section that estimates the stopped position at the start of rotation of the rotor using an elapsed time from when rotation the rotor starts until the kind of the detection signal outputted from the rotation position detecting section switches; a rotational speed estimating section that estimates the rotational speed of the rotor using the elapsed time and the stopped position; and an estimated phase calculating section that calculates an estimated phase as the aforementioned predetermined phase using the rotational speed.Type: GrantFiled: October 30, 2017Date of Patent: April 20, 2021Assignee: SINFONIA TECHNOLOGY CO., LTD.Inventors: Kazunari Kanazawa, Takeshi Tomizaki, Nobumasa Usiro, Makoto Maruyama, Yuji Ogawa
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Patent number: 10931215Abstract: A motor control apparatus 1 includes a fixed phase setting section that sets a fixed phase of a motor according to a detection signal. At the start of rotation of a rotor, the fixed phase setting section sets a first fixed phase that is equal to or greater than ?90 degrees relative to a stable stopping point at a maximum electrical angle and is equal to or less than 90 degrees relative to a stable stopping point at a minimum electrical angle of the rotor as the fixed phase, and sets a second fixed phase that is equal to or greater than ?90 degrees relative to a stable stopping point at a maximum electrical angle and is equal to or less than 90 degrees relative to a stable stopping point at a minimum electrical angle of the rotor.Type: GrantFiled: October 30, 2017Date of Patent: February 23, 2021Assignee: Sinfonia Technology Co., Ltd.Inventors: Kazunari Kanazawa, Takeshi Tomizaki, Nobumasa Usiro, Makoto Maruyama, Yuji Ogawa
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Publication number: 20200144943Abstract: A motor control apparatus includes: a motor drive control section that controls driving of a motor using a predetermined phase; a rotation position detecting section that, at every 180 degrees of an electrical angle of the motor, outputs two kinds of detection signals according to the rotation position of the rotor of the motor; a stopped position estimating section that estimates the stopped position at the start of rotation of the rotor using an elapsed time from when rotation the rotor starts until the kind of the detection signal outputted from the rotation position detecting section switches; a rotational speed estimating section that estimates the rotational speed of the rotor using the elapsed time and the stopped position; and an estimated phase calculating section that calculates an estimated phase as the aforementioned predetermined phase using the rotational speed.Type: ApplicationFiled: October 30, 2017Publication date: May 7, 2020Applicant: SINFONIA TECHNOLOGY CO., LTD.Inventors: Kazunari KANAZAWA, Takeshi TOMIZAKI, Nobumasa USIRO, Makoto MARUYAMA, Yuji OGAWA
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Publication number: 20200144944Abstract: A motor control apparatus 1 includes a fixed phase setting section that sets a fixed phase of a motor according to a detection signal. At the start of rotation of a rotor, the fixed phase setting section sets a first fixed phase that is equal to or greater than ?90 degrees relative to a stable stopping point at a maximum electrical angle and is equal to or less than 90 degrees relative to a stable stopping point at a minimum electrical angle of the rotor as the fixed phase, and sets a second fixed phase that is equal to or greater than ?90 degrees relative to a stable stopping point at a maximum electrical angle and is equal to or less than 90 degrees relative to a stable stopping point at a minimum electrical angle of the rotor.Type: ApplicationFiled: October 30, 2017Publication date: May 7, 2020Applicant: SINFONIA TECHNOLOGY CO., LTD.Inventors: Kazunari KANAZAWA, Takeshi TOMIZAKI, Nobumasa USIRO, Makoto MARUYAMA, Yuji OGAWA
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Patent number: 9287808Abstract: There is obtained a configuration capable of rapidly decelerating a motor even if a failure occurs in the communication between a controller and a motor control unit in a motor controller in which a speed command is input from the controller to the motor control unit. A motor controller 1 is provided with a main controller 2, and a motor control unit 3 configured to be communicable with the main controller 2 to drive a motor M according to a torque command output from the main controller 2. The motor control unit 3 includes a speed control unit 31 for outputting a torque command, so as to decelerate the motor M, if any failure occurs in communication with the main controller 2 while the motor M is being driven.Type: GrantFiled: May 29, 2014Date of Patent: March 15, 2016Assignees: SINFONIA TECHNOLOGY CO., LTD., KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Takeo Ito, Hideaki Moriya, Takeshi Tomizaki, Akira Nakazumi, Yusuke Kamimura
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Patent number: 9276508Abstract: An object of the present invention is to provide an inverter device for driving an electric motor, which allows control stability and efficiency to be ensured over a wide region of the speed of the electric motor. The inverter device includes a rotational-speed detection section which detects a rotational speed of the electric motor, a carrier-frequency calculation section which calculates a carrier frequency on the basis of the detected rotational speed, and a carrier-frequency switching section which switches, on the basis of the calculated carrier frequency, the carrier frequency used for performing PWM control on the electric motor. The carrier-frequency calculation section calculates, as the carrier frequency, a frequency increased with an increase in the electric-motor rotational speed detected by the rotational-speed detection section.Type: GrantFiled: May 29, 2014Date of Patent: March 1, 2016Assignees: KOBELCO CONSTRUCTION MACHINERY CO., LTD., SINFONIA TECHNOLOGY CO., LTD.Inventors: Akira Nakazumi, Yusuke Kamimura, Hiroyuki Suminaga, Takeshi Tomizaki, Hideaki Moriya
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Patent number: 9276512Abstract: There is provided a motor controller capable of suppressing the rotation of a motor at the time of discharging an electric accumulator, and a construction machine provided with the motor controller. A motor controller 10 is provided with a current controller 1 for controlling an electric current supplied from an electric accumulator E to a motor M, and a rotation detector 2 for detecting the rotation of the motor M. The current controller 1 supplies only a d-axis current to the motor M according to a discharge command. If the rotation of the motor M is detected by the rotation detector 2 at the time of discharging the electric accumulator E, the current controller 1 controls the d-axis current so as to suppress the rotation of the motor M.Type: GrantFiled: May 29, 2014Date of Patent: March 1, 2016Assignees: SINFONIA TECHNOLOGY CO., LTD., KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Takeshi Tomizaki, Yuichi Hamaguchi, Takeo Ito, Akira Nakazumi, Yusuke Kamimura
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Patent number: 9075418Abstract: A damping device includes a calculator calculating a pseudo vibration to cancel a source vibration transmitted from a vibration source to a position to be damped, using an adaptive control algorithm. The canceling vibration is generated according to the pseudo vibration. A vibration detector detects an error vibration remaining at the position. The adaptive control algorithm is adapted by learning to reduce the error vibration. A frequency recognizer recognizes a frequency of the source vibration from a signal related to the vibration source. The frequency of the vibration is used to determine a frequency of the pseudo vibration. A phase difference identifier identifies a phase difference between the error vibration and the canceling vibration according to the pseudo vibration, and a frequency corrector corrects, according to the phase difference, the frequency of the vibration to eliminate the phase difference.Type: GrantFiled: May 17, 2012Date of Patent: July 7, 2015Assignee: SINFONIA TECHNOLOGY CO., LTD.Inventors: Takeshi Tomizaki, Hideaki Moriya, Takeo Ito, Yasushi Muragishi
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Publication number: 20140354191Abstract: An object of the present invention is to provide an inverter device for driving an electric motor, which allows control stability and efficiency to be ensured over a wide region of the speed of the electric motor. The inverter device includes a rotational-speed detection section which detects a rotational speed of the electric motor, a carrier-frequency calculation section which calculates a carrier frequency on the basis of the detected rotational speed, and a carrier-frequency switching section which switches, on the basis of the calculated carrier frequency, the carrier frequency used for performing PWM control on the electric motor. The carrier-frequency calculation section calculates, as the carrier frequency, a frequency increased with an increase in the electric-motor rotational speed detected by the rotational-speed detection section.Type: ApplicationFiled: May 29, 2014Publication date: December 4, 2014Applicants: KOBELCO CONSTRUCTION MACHINERY CO., LTD., SINFONIA TECHNOLOGY CO., LTD.Inventors: Akira NAKAZUMI, Yusuke KAMIMURA, Hiroyuki SUMINAGA, Takeshi TOMIZAKI, Hideaki MORIYA
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Publication number: 20140354197Abstract: There is obtained a configuration capable of rapidly decelerating a motor even if a failure occurs in the communication between a controller and a motor control unit in a motor controller in which a speed command is input from the controller to the motor control unit. A motor controller 1 is provided with a main controller 2, and a motor control unit 3 configured to be communicable with the main controller 2 to drive a motor M according to a torque command output from the main controller 2. The motor control unit 3 includes a speed control unit 31 for outputting a torque command, so as to decelerate the motor M, if any failure occurs in communication with the main controller 2 while the motor M is being driven.Type: ApplicationFiled: May 29, 2014Publication date: December 4, 2014Applicants: SINFONIA TECHNOLOGY CO., LTD., KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Takeo Ito, Hideaki Moriya, Takeshi Tomizaki, Akira Nakazumi, Yusuke Kamimura
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Publication number: 20140354205Abstract: There is provided a motor controller capable of suppressing the rotation of a motor at the time of discharging an electric accumulator, and a construction machine provided with the motor controller. A motor controller 10 is provided with a current controller 1 for controlling an electric current supplied from an electric accumulator E to a motor M, and a rotation detector 2 for detecting the rotation of the motor M. The current controller 1 supplies only a d-axis current to the motor M according to a discharge command. If the rotation of the motor M is detected by the rotation detector 2 at the time of discharging the electric accumulator E, the current controller 1 controls the d-axis current so as to suppress the rotation of the motor M.Type: ApplicationFiled: May 29, 2014Publication date: December 4, 2014Applicants: SINFONIA TECHNOLOGY CO., LTD., KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Takeshi Tomizaki, Yuichi Hamaguchi, Takeo Ito, Akira Nakazumi, Yusuke Kamimura
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A/D conversion device and vibration damping apparatus for automobile using the A/D conversion device
Patent number: 8538630Abstract: An A/D conversion device includes a first A/D converter that receives an analog vibration signal corresponding to a vibration detected by a vibration detecting sensor and converts the analog vibration signal to a first digital value, an analog amplifier that amplifies the analog vibration signal and outputs an amplified signal, a second A/D converter that converts the amplified signal to a second digital value, a determiner that determines whether an amplitude of the amplified signal input to the second A/D converter exceeds a range of amplitude that is convertible by the second A/D converter, and a selector that receives the first digital value and the second digital value and output one of the first and second digital values based on the determination of the determiner.Type: GrantFiled: April 27, 2012Date of Patent: September 17, 2013Assignee: Sinfonia Technology Co., Ltd.Inventors: Keisuke Matsuno, Hidetoshi Katada, Takeshi Tomizaki, Hideaki Moriya -
Patent number: 8471502Abstract: A vibration damping apparatus including reference wave production section that produces a reference wave; a fundamental order adaptive algorithm block that calculates fundamental order adaptive filter factors from a vibration detection signal and the reference wave and produces a fundamental order vibration damping current instruction; an amplitude detection section that calculates a peak current value of the fundamental order vibration damping current instruction; and a fundamental order current excess detection section that derives a fundamental order current upper limit value from the fundamental frequency to produce a fundamental order current upper limit excess signal that is output to the fundamental order adaptive algorithm block, which revises the fundamental order adaptive filter factors in a direction in which the vibration damping current instruction is limited within a range.Type: GrantFiled: June 26, 2012Date of Patent: June 25, 2013Assignee: Sinfonia Technology Co., Ltd.Inventors: Hideaki Moriya, Takeshi Tomizaki, Takeo Ito, Yasushi Muragishi, Takayoshi Fujii
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Patent number: 8381579Abstract: The present invention provides a vibration damping device which can enhance a vibration damping effect even in a case where a vibration damping target position and a vibration damping force generation position are different from each other.Type: GrantFiled: May 13, 2009Date of Patent: February 26, 2013Assignee: Sinfonia Technology Co., Ltd.Inventors: Yushi Sato, Hideaki Moriya, Takeo Ito, Takayoshi Fujii, Takashi Fukunaga, Katsuyoshi Nakano, Hiroshi Nakagawa, Hidetoshi Katada, Takeshi Tomizaki, Takashi Onoue, Yasushi Muragishi
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Publication number: 20120293094Abstract: A vibration damping apparatus including reference wave production section that produces a reference wave; a fundamental order adaptive algorithm block that calculates fundamental order adaptive filter factors from a vibration detection signal and the reference wave and produces a fundamental order vibration damping current instruction; an amplitude detection section that calculates a peak current value of the fundamental order vibration damping current instruction; and a fundamental order current excess detection section that derives a fundamental order current upper limit value from the fundamental frequency to produce a fundamental order current upper limit excess signal that is output to the fundamental order adaptive algorithm block, which revises the fundamental order adaptive filter factors in a direction in which the vibration damping current instruction is limited within a range.Type: ApplicationFiled: June 26, 2012Publication date: November 22, 2012Applicant: SINFONIA TECHNOLOGY CO., LTD.Inventors: Hideaki MORIYA, Takeshi TOMIZAKI, Takeo ITO, Yasushi MURAGISHI, Takayoshi FUJII
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Publication number: 20120226414Abstract: A damping device includes a calculator calculating a pseudo vibration to cancel a source vibration transmitted from a vibration source to a position to be damped, using an adaptive control algorithm. The canceling vibration is generated according to the pseudo vibration. A vibration detector detects an error vibration remaining at the position. The adaptive control algorithm is adapted by learning to reduce the error vibration. A frequency recognizer recognizes a frequency of the source vibration from a signal related to the vibration source. The frequency of the vibration is used to determine a frequency of the pseudo vibration. A phase difference identifier identifies a phase difference between the error vibration and the canceling vibration according to the pseudo vibration, and a frequency corrector corrects, according to the phase difference, the frequency of the vibration to eliminate the phase difference.Type: ApplicationFiled: May 17, 2012Publication date: September 6, 2012Applicant: SINFONIA TECHNOLOGY CO., LTD.Inventors: Takeshi TOMIZAKI, Hideaki MORIYA, Takeo ITO, Yasushi MURAGISHI
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A/D CONVERSION DEVICE AND VIBRATION DAMPING APPARATUS FOR AUTOMOBILE USING THE A/D CONVERSION DEVICE
Publication number: 20120215405Abstract: An A/D conversion device includes a first A/D converter that receives an analog vibration signal corresponding to a vibration detected by a vibration detecting sensor and converts the analog vibration signal to a first digital value, an analog amplifier that amplifies the analog vibration signal and outputs an amplified signal, a second A/D converter that converts the amplified signal to a second digital value, a determiner that determines whether an amplitude of the amplified signal input to the second A/D converter exceeds a range of amplitude that is convertible by the second A/D converter, and a selector that receives the first digital value and the second digital value and output one of the first and second digital values based on the determination of the determiner.Type: ApplicationFiled: April 27, 2012Publication date: August 23, 2012Applicant: SINFONIA TECHNOLOGY CO., LTD.Inventors: Keisuke MATSUNO, Hidetoshi Katada, Takeshi Tomizaki, Hideaki Moriya -
Publication number: 20110048118Abstract: The present invention provides a vibration damping device which can enhance a vibration damping effect even in a case where a vibration damping target position and a vibration damping force generation position are different from each other.Type: ApplicationFiled: May 13, 2009Publication date: March 3, 2011Applicant: SINFONIA TECHNOLOGY CO., LTD.Inventors: Yushi Sato, Hideaki Moriya, Takeo Ito, Takayoshi Fujii, Takashi Fukunaga, Katsuyoshi Nakano, Hiroshi Nakagawa, Hidetoshi Katada, Takeshi Tomizaki, Takashi Onoue, Yasushi Muragishi