Patents by Inventor Mamoru Takaki
Mamoru Takaki 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: 9509233Abstract: A power converter according to embodiments includes a boost circuit, a single-phase inverter, a current controller, and a power conversion controller. The current controller generates a voltage reference based on a difference between current output from the single-phase inverter and a current reference. The power conversion controller controls the single-phase inverter to generate a first portion of the AC voltage, and controls the boost circuit to generate a second portion of the AC voltage. The first portion corresponds to the voltage reference of which an absolute value is smaller than the voltage of the DC power supply. The second portion corresponds to the voltage reference of which an absolute value is greater than the voltage of the DC power supply.Type: GrantFiled: March 20, 2015Date of Patent: November 29, 2016Assignee: KABUSHIKI KAISHA YASKAWA DENKIInventors: Kozo Ide, Tetsumi Narita, Seiji Fujisaki, Mamoru Takaki, Shinya Morimoto
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Patent number: 9484839Abstract: A power converter according to one embodiment includes a controller that switches between a boosting operation in a boost circuit and a pulse-width modulation operation in a single-phase inverter. The controller modifies an output from a voltage detection filter based on a delay compensating value for compensating a detection delay introduced by the voltage detection filter, when switching is performed the boosting operation in the boost circuit to the PWM operation in the single-phase inverter.Type: GrantFiled: January 29, 2015Date of Patent: November 1, 2016Assignee: KABUSHIKI KAISHA YASKAWA DENKIInventors: Seiji Fujisaki, Mamoru Takaki, Shinya Morimoto, Masato Higuchi
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Patent number: 9397602Abstract: A rotary electric machine control apparatus includes: a phase estimator configured to estimate a first estimated phase value based on a rotary electric machine current; a correction value storage configured to store correction information representing a plurality of second estimated phase values and a plurality of correction values; a first phase corrector configured to acquire, based on a second estimated phase value corresponding to the first estimated phase value, from the correction information, a correction value associated with the second estimated phase value, and configured to correct the second estimated phase values based on the correction value; a position controller configured to calculate a speed command based on a position command and the corrected second estimated phase value; and a speed controller configured to calculate a torque command value and a q-axis current command value based on the speed command and the corrected second estimated phase value.Type: GrantFiled: August 4, 2014Date of Patent: July 19, 2016Assignee: KABUSHIKI KAISHA YASKAWA DENKIInventors: Mamoru Takaki, Shinya Morimoto, Aamir Noor Baloch, Masaki Hisatsune, Masanobu Kakihara
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Publication number: 20150280612Abstract: A power converter according to embodiments includes a boost circuit, a single-phase inverter, a current controller, and a power conversion controller. The current controller generates a voltage reference based on a difference between current output from the single-phase inverter and a current reference. The power conversion controller controls the single-phase inverter to generate a first portion of the AC voltage, and controls the boost circuit to generate a second portion of the AC voltage. The first portion corresponds to the voltage reference of which an absolute value is smaller than the voltage of the DC power supply. The second portion corresponds to the voltage reference of which an absolute value is greater than the voltage of the DC power supply.Type: ApplicationFiled: March 20, 2015Publication date: October 1, 2015Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Kozo IDE, Tetsumi NARITA, Seiji FUJISAKI, Mamoru TAKAKI, Shinya MORIMOTO
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Publication number: 20150270787Abstract: A power converter according to one embodiment includes a controller that switches between a boosting operation in a boost circuit and a pulse-width modulation operation in a single-phase inverter. The controller modifies an output from a voltage detection filter based on a delay compensating value for compensating a detection delay introduced by the voltage detection filter, when switching is performed the boosting operation in the boost circuit to the PWM operation in the single-phase inverter.Type: ApplicationFiled: January 29, 2015Publication date: September 24, 2015Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Seiji FUJISAKI, Mamoru TAKAKI, Shinya MORIMOTO, Masato HIGUCHI
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Publication number: 20150244298Abstract: A rotary electric machine control apparatus includes: a phase estimator configured to estimate a first estimated phase value based on a rotary electric machine current; a correction value storage configured to store correction information representing a plurality of second estimated phase values and a plurality of correction values; a first phase corrector configured to acquire, based on a second estimated phase value corresponding to the first estimated phase value, from the correction information, a correction value associated with the second estimated phase value, and configured to correct the second estimated phase values based on the correction value; a position controller configured to calculate a speed command based on a position command and the corrected second estimated phase value; and a speed controller configured to calculate a torque command value and a q-axis current command value based on the speed command and the corrected second estimated phase value.Type: ApplicationFiled: August 4, 2014Publication date: August 27, 2015Inventors: Mamoru TAKAKI, Shinya MORIMOTO, Aamir Noor BALOCH, Masaki HISATSUNE, Masanobu KAKIHARA
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Patent number: 9112414Abstract: Provided is a matrix converter including a power converter, a commutation controller, and a compensator. The power converter includes a plurality of bidirectional switches. The commutation controller performs one of a three-step commutation operation and a four-step commutation operation by the bidirectional switches as a switch source and the bidirectional switches as a switch destination when an input terminal to be connected to an output terminal is switched by on/off control of the bidirectional switches. The compensator compensates for an output voltage error generated when the input terminal to be connected to the output terminal is switched, based on a potential difference before and after the switching of the input terminal to be connected to the output terminal, an output current of the output terminal, and capacitance between input and output terminals of unidirectional switches.Type: GrantFiled: March 11, 2014Date of Patent: August 18, 2015Assignee: KABUSHIKI KAISHA YASKAWA DENKIInventors: Kentaro Inomata, Shinya Morimoto, Mamoru Takaki, Yoshiyasu Takase
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Publication number: 20140254230Abstract: Provided is a matrix converter including a power converter, a commutation controller, and a compensator. The power converter includes a plurality of bidirectional switches. The commutation controller performs one of a three-step commutation operation and a four-step commutation operation by the bidirectional switches as a switch source and the bidirectional switches as a switch destination when an input terminal to be connected to an output terminal is switched by on/off control of the bidirectional switches. The compensator compensates for an output voltage error generated when the input terminal to be connected to the output terminal is switched, based on a potential difference before and after the switching of the input terminal to be connected to the output terminal, an output current of the output terminal, and capacitance between input and output terminals of unidirectional switches.Type: ApplicationFiled: March 11, 2014Publication date: September 11, 2014Applicant: Kabushiki Kaisha Yaskawa DenkiInventors: Kentaro INOMATA, Shinya MORIMOTO, Mamoru TAKAKI, Yoshiyasu TAKASE
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Patent number: 8525466Abstract: This inverter device includes a power portion performing PWM control on a voltage command to a motor for each set time period, converting direct-current power into alternating-current power, and outputting the same, a voltage command generation portion generating a voltage command in synchronization with a period N-times (N?1) longer than the time period, an interval determination portion generating an interval determination signal which is ON during a half period of the time period and OFF during the next half period, a current detection portion detecting the current of the motor at timing of change in the interval determination signal, and a voltage correction portion generating a voltage correction value such that the amount of change in the detected current when the interval determination signal is ON becomes equal to the amount of change in the detected current when it is OFF and correcting the voltage command.Type: GrantFiled: August 29, 2012Date of Patent: September 3, 2013Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Mamoru Takaki, Shinya Morimoto, Masaki Hisatsune
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Publication number: 20120319629Abstract: This inverter device includes a power portion performing PWM control on a voltage command to a motor for each set time period, converting direct-current power into alternating-current power, and outputting the same, a voltage command generation portion generating a voltage command in synchronization with a period N-times (N?1) longer than the time period, an interval determination portion generating an interval determination signal which is ON during a half period of the time period and OFF during the next half period, a current detection portion detecting the current of the motor at timing of change in the interval determination signal, and a voltage correction portion generating a voltage correction value such that the amount of change in the detected current when the interval determination signal is ON becomes equal to the amount of change in the detected current when it is OFF and correcting the voltage command.Type: ApplicationFiled: August 29, 2012Publication date: December 20, 2012Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Mamoru TAKAKI, Shinya MORIMOTO, Masaki HISATSUNE
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Patent number: 8269441Abstract: A motor control apparatus includes a current control unit which is configured to calculate dq-axis voltage commands to match d-axis and q-axis current commands with d-axis and q-axis currents of a motor current, respectively. A power conversion circuit is configured to drive the motor. A modulation factor command unit is configured to determine a modulation factor command. A modulation wave command unit is configured to determine modulation wave commands. A pulse width modulation generating unit is configured to generate a pulse width modulation pattern. A modulation factor saturation level calculating unit is configured to determine a modulation factor saturation level. A field-weakening control unit is configured to correct the d-axis current command.Type: GrantFiled: May 13, 2010Date of Patent: September 18, 2012Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Shinya Morimoto, Mamoru Takaki
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Patent number: 7872438Abstract: The present invention provides an initial pole position estimating apparatus and method for an AC synchronous motor without using magnetic pole detector. The initial pole position estimating apparatus includes a thrust force or torque pattern generating portion for generating a thrust force or torque pattern, a pole position command generating portion for generating a pole position command, and a position detecting portion for detecting a position of the AC synchronous motor. The initial pole position estimating apparatus can estimate an initial pole position in a short time with high precision without depending on a fluctuation in a load. The initial pole position estimating apparatus further includes a pole position correcting portion (8) for correcting the pole position command and a thrust force or torque pattern correcting portion (9) for correcting the thrust force or torque pattern, and an initial pole position is estimated through a repetitive correction.Type: GrantFiled: September 8, 2006Date of Patent: January 18, 2011Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Shinya Morimoto, Hyun-Soo Song, Mamoru Takaki, Kozo Ide
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Publication number: 20100219780Abstract: A motor control apparatus includes a current control unit which is configured to calculate dq-axis voltage commands to match d-axis and q-axis current commands with d-axis and q-axis currents of a motor current, respectively. A power conversion circuit is configured to drive the motor. A modulation factor command unit is configured to determine a modulation factor command. A modulation wave command unit is configured to determine modulation wave commands. A pulse width modulation generating unit is configured to generate a pulse width modulation pattern. A modulation factor saturation level calculating unit is configured to determine a modulation factor saturation level. A field-weakening control unit is configured to correct the d-axis current command.Type: ApplicationFiled: May 13, 2010Publication date: September 2, 2010Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Shinya MORIMOTO, Mamoru Takaki
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Patent number: 7619377Abstract: A linear motor system that can extend the stroke of a linear motor, with power saving and at a low cost, is provided. In a linear motor system, constituted by a linear motor 100, a controller 7 for supplying a variable voltage, a winding switching device 6, for opening and closing phase windings 5 of individual phases that form a plurality of winding groups 4 that are separated in a stroke direction, the winding switching device 6 is constituted by a three-phase rectifying member, a semiconductor switch, which is located at both ends on the direct-current output side of the three-phase rectifying member, and a resistor and a capacitor, connected in parallel to the semiconductor switch. For each of the phase windings, which form the plurality of winding groups 4, separated in the stroke direction, one end is connected to the output end of the controller 7 and the other end is connected to an alternating-current input side of the three-phase rectifying member of the winding switching device 6.Type: GrantFiled: September 28, 2005Date of Patent: November 17, 2009Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Kenji Yamada, Akihiko Maemura, Shinya Morimoto, Toru Shikayama, Yoshiyuki Tanaka, Mamoru Takaki
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Publication number: 20080309268Abstract: The present invention provides an initial pole position estimating apparatus and method for an AC synchronous motor without using magnetic pole detector. The initial pole position estimating apparatus includes a thrust force or torque pattern generating portion for generating a thrust force or torque pattern, a pole position command generating portion for generating a pole position command, and a position detecting portion for detecting a position of the AC synchronous motor. The initial pole position estimating apparatus can estimate an initial pole position in a short time with high precision without depending on a fluctuation in a load. The initial pole position estimating apparatus further includes a pole position correcting portion (8) for correcting the pole position command and a thrust force or torque pattern correcting portion (9) for correcting the thrust force or torque pattern, and an initial pole position is estimated through a repetitive correction.Type: ApplicationFiled: September 8, 2006Publication date: December 18, 2008Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Shinya Morimoto, Hyun-Soo Song, Mamoru Takaki, Kozo Ide
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Publication number: 20080106155Abstract: A linear motor system that can extend the stroke of a linear motor, with power saving and at a low cost, is provided. In a linear motor system, constituted by a linear motor 100, a controller 7 for supplying a variable voltage, a winding switching device 6, for opening and closing phase windings 5 of individual phases that form a plurality of winding groups 4 that are separated in a stroke direction, the winding switching device 6 is constituted by a three-phase rectifying member, a semiconductor switch, which is located at both ends on the direct-current output side of the three-phase rectifying member, and a resistor and a capacitor, connected in parallel to the semiconductor switch. For each of the phase windings, which form the plurality of winding groups 4, separated in the stroke direction, one end is connected to the output end of the controller 7 and the other end is connected to an alternating-current input side of the three-phase rectifying member of the winding switching device 6.Type: ApplicationFiled: September 28, 2005Publication date: May 8, 2008Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Kenji Yamada, Akihiko Maemura, Shinya Morimoto, Toru Shikayama, Yoshiyuki Tanaka, Mamoru Takaki