Patents by Inventor Yugo Tadano

Yugo Tadano 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).

  • Patent number: 10892695
    Abstract: A low-frequency torque controller 9 outputs a low-frequency torque controller output ?dc* based on a torque command value ?* and a torque detection value ?det, and a vibrational torque controller 11 outputs a vibrational torque command value ?pd* based on the torque command value ?*, the torque detection value ?det, and a rotational phase detection value ?. Meanwhile, in a high-frequency resonance suppression controller, an inverter torque command value ?inv* is outputted based on the torque detection value ?det and a corrected torque command value ?r* obtained by adding the low-frequency torque controller output ?dc* to the vibrational torque command value ?pd*. The invention thus provides shaft torque vibrational control of a motor drive system wherein engine vibrational torque command values including distortion components are tracked while entirely removing the influence of resonance, non-periodic disturbances, and periodic disturbances.
    Type: Grant
    Filed: April 7, 2020
    Date of Patent: January 12, 2021
    Assignee: Meidensha Corporation
    Inventors: Yugo Tadano, Takao Akiyama, Takashi Yamaguchi
  • Publication number: 20200304050
    Abstract: A low-frequency torque controller 9 outputs a low-frequency torque controller output ?dc* based on a torque command value ?* and a torque detection value ?det, and a vibrational torque controller 11 outputs a vibrational torque command value ?pd* based on the torque command value ?*, the torque detection value ?det, and a rotational phase detection value ?. Meanwhile, in a high-frequency resonance suppression controller, an inverter torque command value ?inv* is outputted based on the torque detection value ?det and a corrected torque command value ?r* obtained by adding the low-frequency torque controller output ?dc* to the vibrational torque command value ?pd*. The invention thus provides shaft torque vibrational control of a motor drive system wherein engine vibrational torque command values including distortion components are tracked while entirely removing the influence of resonance, non-periodic disturbances, and periodic disturbances.
    Type: Application
    Filed: April 7, 2020
    Publication date: September 24, 2020
    Applicant: Meidensha Corporation
    Inventors: Yugo Tadano, Takao Akiyama, Takashi Yamaguchi
  • Patent number: 10558176
    Abstract: A control system comprising a feedback controller 1 for determining an operation amount u in a control-implemented system based on a command value r*, a detection value y of the control-implemented system and phase information ? for the control-implemented system, wherein the feedback controller 1 has a periodic disturbance suppression controller 4 for outputting a periodic disturbance compensation signal rpd* based on the detection value y and the phase information ?; and a resonance/disturbance suppression controller 3 for calculating the operation amount u based on the detection value y and a corrected command value r obtained by adding the periodic disturbance compensation signal rpd* to the command value r*. The periodic disturbance suppression controller 4 uses a generalized periodic disturbance observer. In the control system, resonance, non-periodic disturbances and periodic disturbances are all suppressed in order to raise the system control performance.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: February 11, 2020
    Assignee: Meidensha Corporation
    Inventors: Yugo Tadano, Masakatsu Nomura
  • Publication number: 20190227500
    Abstract: A control system comprising a feedback controller 1 for determining an operation amount u in a control-implemented system based on a command value r*, a detection value y of the control-implemented system and phase information ? for die control-implemented system, wherein the feedback controller 1 has a periodic disturbance suppression controller 4 for outputting a periodic disturbance compensation signal rpd* based on the detection value y mid the phase information ?; and a resonance/disturbance suppression controller 3 for calculating the operation amount u based on the detection value y and a corrected command value r obtained by adding the periodic disturbance compensation signal rpd* to the command value r*. The periodic disturbance suppression controller 4 uses a generalized periodic disturbance observer. In the control system, resonance, non-periodic disturbances and periodic disturbances are all suppressed in order to raise the system control performance.
    Type: Application
    Filed: March 15, 2017
    Publication date: July 25, 2019
    Inventors: Yugo Tadano, Masakatsu Nomura
  • Publication number: 20190229659
    Abstract: A low-frequency torque controller 9 outputs a low-frequency torque controller output ?dc* based on a torque command value ?* and a torque detection value ?det, and a vibrational torque controller 11 outputs a vibrational torque command value ?pd* based on the torque command value ?*, the torque detection value ?det, and a rotational phase detection value ?. Meanwhile, in a high-frequency resonance suppression controller, an inverter torque command value ?inv* is outputted based on the torque detection value ?det and a corrected torque command value ?r* obtained by adding the low-frequency torque controller output ?dc* to the vibrational torque command value ?pd*. The invention thus provides shaft torque vibrational control of a motor drive system wherein engine vibrational torque command values including distortion components are tracked while entirely removing the influence of resonance, non-periodic disturbances, and periodic disturbances.
    Type: Application
    Filed: March 15, 2017
    Publication date: July 25, 2019
    Applicant: Meidensha Corporation
    Inventors: Yugo TADANO, Takao AKIYAMA, Takashi YAMAGUCHI
  • Patent number: 10331094
    Abstract: A periodic disturbance suppressing control apparatus is designed to estimate and correct an inverse model of a transfer characteristic of a real system successively even in case of large condition change in the real system, and to realize a stable control system. A periodic disturbance of an object to be suppressed is outputted as a sensed periodic disturbance ISdn, ISqn of a direct current component. A difference between a signal obtained by multiplication of the sensed periodic disturbance ISdn, ISqn with a multiplier using a reciprocal Qn of a transfer characteristic, and a signal obtained by adding only a detection delay to a periodic disturbance suppressing command I*dn, I*qn, to estimate the periodic disturbance dI^dn, dI^qn. Thee periodic disturbance suppressing command is calculated by calculating a deviation between the estimated periodic disturbance dI^dn, dI^qn.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: June 25, 2019
    Assignee: MEIDENSHA CORPORATION
    Inventor: Yugo Tadano
  • Patent number: 9973128
    Abstract: Periodic disturbance occurs in current etc. due to offset error and gain error of a current sensor used in a control device. A voltage command value is generated from a current command value and a current detection value by the current sensor in a current control section. The generated voltage command value is inputted to a plant model section, and a virtual current value is calculated. The virtual current value is inputted to a periodic disturbance observer via a coordinate transform section, and a compensation value is calculated. The compensation value is superimposed on the current detection value via a coordinate inverse-transform section, and the current detection value of the current sensor is corrected.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: May 15, 2018
    Assignee: MEIDENSHA CORPORATION
    Inventors: Takashi Yamaguchi, Yugo Tadano
  • Patent number: 9729094
    Abstract: In torque pulsation suppressing control in apparatus using battery as main power source, with feedforward table, there arises compensating table error due to voltage fluctuation by battery internal resistance, depending on load power. In system where compensating values for suppressing torque pulsation are collected beforehand in the form of compensating table, and the torque pulsation of each frequency component is suppressed by the torque compensating quantity determined by inputting torque command and sensed rotational speed, the system senses main power source voltage of controlled object, and to perform compensation by outputting the torque compensating quantity dependent on the voltage by inputting into the compensating table corresponding to voltage.
    Type: Grant
    Filed: June 10, 2014
    Date of Patent: August 8, 2017
    Assignee: MEIDENSHA CORPORATION
    Inventors: Takashi Yamaguchi, Yugo Tadano
  • Patent number: 9614474
    Abstract: In suppression of torque ripple with a periodic disturbance observer, adjustment of a gain portion is determined sequentially during monitoring operation of monitoring an operating condition. Therefore, many adjusting parameters are involved and achievement of correction is dependent on the skill of a person in charge of adjustment or design. The periodic disturbance observer is provided with a model correcting means or section which calculates an error of an identification model by using a time difference quantity by an output of the periodic disturbance observer and a sensed value of a plant and corrects the identification model with the error of the identification model. Finally, the system performs the torque ripple suppression control with an accurately estimated periodic disturbance.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: April 4, 2017
    Assignee: MEIDENSHA CORPORATION
    Inventors: Takashi Yamaguchi, Yugo Tadano
  • Publication number: 20160349717
    Abstract: A periodic disturbance suppressing control apparatus is designed to estimate and correct an inverse model of a transfer characteristic of a real system successively even in case of large condition change in the real system, and to realize a stable control system. A periodic disturbance of an object to be suppressed is outputted as a sensed periodic disturbance ISdn, ISqn of a direct current component. A difference between a signal obtained by multiplication of the sensed periodic disturbance ISdn, ISqn with a multiplier using a reciprocal Qn of a transfer characteristic, and a signal obtained by adding only a detection delay to a periodic disturbance suppressing command I*dn, I*qn, to estimate the periodic disturbance dI?dn, dI?qn. Thee periodic disturbance suppressing command is calculated by calculating a deviation between the estimated periodic disturbance dI?dn, dI?qn.
    Type: Application
    Filed: January 30, 2015
    Publication date: December 1, 2016
    Applicant: MEIDENSHA CORPORATION
    Inventor: Yugo TADANO
  • Publication number: 20160218652
    Abstract: Periodic disturbance occurs in current etc. due to offset error and gain error of a current sensor used in a control device. A voltage command value is generated from a current command value and a current detection value by the current sensor in a current control section. The generated voltage command value is inputted to a plant model section, and a virtual current value is calculated. The virtual current value is inputted to a periodic disturbance observer via a coordinate transform section, and a compensation value is calculated. The compensation value is superimposed on the current detection value via a coordinate inverse-transform section, and the current detection value of the current sensor is corrected.
    Type: Application
    Filed: September 25, 2014
    Publication date: July 28, 2016
    Applicant: MEIDENSHA CORPORATION
    Inventors: Takashi YAMAGUCHI, Yugo TADANO
  • Patent number: 9400508
    Abstract: In a torque ripple suppression control effected by a periodicity disturbance observer, it is necessary to consider plant fluctuation and fluctuation of plant characteristics caused by over time usage. Thus, improvement for robustness to an identification model error has been required.
    Type: Grant
    Filed: April 11, 2012
    Date of Patent: July 26, 2016
    Assignee: MEIDENSHA CORPORATION
    Inventors: Takashi Yamaguchi, Yugo Tadano, Kazunobu Oi
  • Publication number: 20160134218
    Abstract: In torque pulsation suppressing control in apparatus using battery as main power source, with feedforward table, there arises compensating table error due to voltage fluctuation by battery internal resistance, depending on load power. In system where compensating values for suppressing torque pulsation are collected beforehand in the form of compensating table, and the torque pulsation of each frequency component is suppressed by the torque compensating quantity determined by inputting torque command and sensed rotational speed, the system senses main power source voltage of controlled object, and to perform compensation by outputting the torque compensating quantity dependent on the voltage by inputting into the compensating table corresponding to voltage.
    Type: Application
    Filed: June 10, 2014
    Publication date: May 12, 2016
    Applicant: MEIDENSHA CORPORATION
    Inventors: Takashi YAMAGUCHI, Yugo TADANO
  • Publication number: 20150326163
    Abstract: In suppression of torque ripple with a periodic disturbance observer, adjustment of a gain portion is determined sequentially during monitoring operation of monitoring an operating condition. Therefore, many adjusting parameters are involved and achievement of correction is dependent on the skill of a person in charge of adjustment or design. The periodic disturbance observer is provided with a model correcting means or section which calculates an error of an identification model by using a time difference quantity by an output of the periodic disturbance observer and a sensed value of a plant and corrects the identification model with the error of the identification model. Finally, the system performs the torque ripple suppression control with an accurately estimated periodic disturbance.
    Type: Application
    Filed: December 5, 2013
    Publication date: November 12, 2015
    Applicant: MEIDENSHA CORPORATION
    Inventors: Takashi YAMAGUCHI, Yugo TADANO
  • Patent number: 8971066
    Abstract: A current control unit takes a deviation between a current command value and a current flowing through an inverter of a power conversion device, and controls the inverter based on the deviation. A harmonic sensing part receives input of an output current of an AC filter, and outputs a predetermined order harmonic of the input current in a direct current value form. A disturbance observer estimates the disturbance of the harmonic based on the output current and a coefficient defined as an inverse function of a transfer function from harmonic suppression current command value to filter output current detection value. A harmonic suppression control unit takes the deviation between the estimated harmonic disturbance and a disturbance command value that suppresses the disturbance, and calculates a harmonic suppression current command value. The harmonic suppression current command value is superimposed on the current command value of the current control unit.
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: March 3, 2015
    Assignee: Meidensha Corporation
    Inventors: Kazunobu Oi, Yugo Tadano
  • Patent number: 8855953
    Abstract: A motor drive device including a battery 10; switching elements 15 and 16 which are connected in series with a condenser C2 having a voltage Vdc resulting from an increase action of battery voltage and which are operated in a chopper control; a reactor L2 whose one end is connected with a common connection point of the switching elements 15 and 16; and an inverter 19 for driving a PM motor 20 which is connected between another end of the reactor L2 and a negative-pole terminal of the battery 10. In such a motor drive device, an electrical power W is determined based on the voltage Vdc of positive-side point P of the condenser C2, a current Idc flowing in the reactor L2, and a switching duty d1 of the switching element 15 which satisfies a condition of 0?d1?1, i.e., is determined by calculating Vdc·d1·Idc.
    Type: Grant
    Filed: July 8, 2010
    Date of Patent: October 7, 2014
    Assignee: Meidensha Corporation
    Inventors: Takashi Yamaguchi, Yugo Tadano, Toru Kakebayashi
  • Patent number: 8704475
    Abstract: Disclosed is a current source inverter device which controls the power factor in an arbitrarily configurable manner without a magnetic pole position detector. The device is provided with a current source inverter; a motor supplied with alternating current power from the current source inverter; and a control means which detects the terminal voltage of the motor, calculates the motor's internal induced voltage and the motor current that flows in the motor based on the detected terminal voltage, and controls the current source inverter. The control means calculates the phase difference (?c) between the terminal voltage and the motor current, the phase difference (?x) between the motor current and the internal induced voltage, and the phase difference (?v) between the terminal voltage and the internal induced voltage.
    Type: Grant
    Filed: March 5, 2010
    Date of Patent: April 22, 2014
    Assignee: Meidensha Corporation
    Inventors: Takashi Yamaguchi, Yugo Tadano, Toru Kakebayashi
  • Patent number: 8704469
    Abstract: A periodic disturbance observer determines real part I^An and imaginary part I^Bn of an estimated current including a periodic disturbance, from value of identification identifying a system transfer function of an nth order torque ripple frequency component from a command torque to a detected torque value, with a one-dimensional complex vector having a real part P^An and an imaginary part P^Bn, a cosine coefficient TAn, a sine coefficient TBn, and the real part P^An and imaginary part P^Bn of the system transfer function; subtracts command compensating current IAn* and IBn* obtained through pulsation extracting filter GF, respectively, from the real part I^An and imaginary part I^Bn of the estimated current, and thereby determines estimated periodic disturbance current real part dI^An and imaginary part dI^Bn to cancel the periodic disturbance current.
    Type: Grant
    Filed: February 22, 2011
    Date of Patent: April 22, 2014
    Assignee: Meidensha Corporation
    Inventor: Yugo Tadano
  • Publication number: 20140039694
    Abstract: In a torque ripple suppression control effected by a periodicity disturbance observer, it is necessary to consider plant fluctuation and fluctuation of plant characteristics caused by over time usage. Thus, improvement for robustness to an identification model error has been required.
    Type: Application
    Filed: April 11, 2012
    Publication date: February 6, 2014
    Inventors: Takashi Yamaguchi, Yugo Tadano, Kazunobu Oi
  • Patent number: 8564997
    Abstract: [Problem] To provide a space vector modulation method for a matrix converter which uses only one carrier for three phases when a carrier comparison is made. [Means for solving problem] Provided is a matrix converter space vector modulation method in which bidirectional switches (SW1 through SW9) of a matrix converter (3) are PWM controlled in a space vector modulation from a multi-phase AC power source. Switching patterns for which virtual indirect space vectors are used are converted into switching patterns for which direct conversion space vectors constituted by five vectors are used. Any one of the converted switching patterns satisfying predetermined conditions is selected and duties of the five vectors of the selected switching pattern are calculated using duty relationship equations between the virtual indirect conversion space vectors and the direct conversion space vectors. Then, the matrix converter is PWM-controlled on a basis of the calculated duties.
    Type: Grant
    Filed: March 12, 2008
    Date of Patent: October 22, 2013
    Assignee: Meidensha Corporation
    Inventors: Shota Urushibata, Yugo Tadano