Patents by Inventor Toshimitsu Aizawa
Toshimitsu Aizawa 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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Publication number: 20240048079Abstract: An electric motor drive apparatus includes an electric motor. A power conversion device, a controller, and a current detector. The controller calculates a phase of an armature flux linkage of the electric motor by using a flowing current detected by the current detector. The calculating a phase of an armature flux linkage of the electric motor includes calculating an armature flux linkage of the electric motor including an initial value of an armature flux linkage of the electric motor which is calculated from a rotational position of the electric motor estimated by using a motor flux of the electric motor measured in advance and the flowing current.Type: ApplicationFiled: August 2, 2023Publication date: February 8, 2024Applicants: KABUSHIKI KAISHA TOSHIBA, Toshiba Electronic Devices & Storage CorporationInventors: Takashi TAKAGI, Toshimitsu AIZAWA, Tadashi ASUKAI
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Publication number: 20230251327Abstract: In an embodiment, a diagnostic apparatus of an electric power converter is provided, and the electric power converter outputs a converted AC electric power to an electric motor, thereby driving the electric motor. The diagnostic apparatus includes an output control unit and a degradation determination unit. The output control unit controls operations of semiconductor elements of the electric power converter, thereby outputting electric power from the electric power converter to the electric motor by constant voltage output, which constantly sets an output voltage to the electric motor in a target voltage pattern. The degradation determination unit determines a degradation state for at least one of the semiconductor elements based on a current flowing through the electric motor in the constant voltage output.Type: ApplicationFiled: December 9, 2022Publication date: August 10, 2023Inventors: Toshimitsu Aizawa, Shinichi Kominato, Tsuyoshi Shinohara, Kohei Hasegawa
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Patent number: 11658596Abstract: A motor control device of an embodiment includes a power supply unit that supplies AC power to a motor; a current detection unit that detects a current flowing through a winding of the motor; a speed and electric angle estimation unit that estimates a rotation speed and an electric angle of the motor based on a voltage outputted by the power supply unit and the current; a coordinate conversion unit that obtains an excitation current and a torque current based on the current and the electric angle; a torque current command determination unit that substitutes a predicted torque calculated based on a mechanical motion equation into a torque component current command value calculated based on a torque expression of a vector control coordinate, to generate a torque component current command value for bringing a difference between an inputted speed command and an estimated speed closer to zero; and a model prediction control unit that applies, to a plurality of predicted currents including a current change ratio deType: GrantFiled: May 18, 2022Date of Patent: May 23, 2023Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA CARRIER CORPORATIONInventors: Takeshi Shibayama, Mariko Kuboi, Toshimitsu Aizawa, Naohito Kamiya, Yoshitaka Uchiyama
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Publication number: 20230045429Abstract: A motor control device of an embodiment includes a power supply unit that supplies AC power to a motor; a current detection unit that detects a current flowing through a winding of the motor; a speed and electric angle estimation unit that estimates a rotation speed and an electric angle of the motor based on a voltage outputted by the power supply unit and the current; a coordinate conversion unit that obtains an excitation current and a torque current based on the current and the electric angle; a torque current command determination unit that substitutes a predicted torque calculated based on a mechanical motion equation into a torque component current command value calculated based on a torque expression of a vector control coordinate, to generate a torque component current command value for bringing a difference between an inputted speed command and an estimated speed closer to zero; and a model prediction control unit that applies, to a plurality of predicted currents including a current change ratio deType: ApplicationFiled: May 18, 2022Publication date: February 9, 2023Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA CARRIER CORPORATIONInventors: Takeshi SHIBAYAMA, Mariko KUBOI, Toshimitsu AIZAWA, Naohito KAMIYA, Yoshitaka UCHIYAMA
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Patent number: 11456689Abstract: According to one embodiment, a driving device includes a voltage controller, a parameter setter, and a phase adjuster. The voltage controller causes an electric power converter to apply a drive voltage to the electric motor, the electric power converter converting input electric power to A/C electric power having desired voltage and frequency and supplying the converted electric power to an electric motor. The parameter setter sets at least one of a rotation speed of the electric motor and a parameter related to the rotation speed as speed information. The phase adjuster adjusts a phase of the drive voltage in such a manner that an index calculated based on a current flowing in the electric motor and the speed information set in the parameter setter becomes smaller.Type: GrantFiled: December 23, 2019Date of Patent: September 27, 2022Assignees: KABUSHIKI KAISHA TOSHIBA, Toshiba Electronic Devices & Storage CorporationInventors: Takashi Takagi, Toshimitsu Aizawa, Shen Wang
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Patent number: 11271513Abstract: A driving device of one embodiment includes a phase estimator and a voltage controller. The phase estimator estimates a phase of stator interlinkage magnetic flux of an electric motor based on a current flowing through the electric motor, a voltage command of a drive voltage applied to the electric motor, and a winding resistance value of the electric motor. The voltage controller acquires a first voltage vector component in a direction in which the stator interlinkage magnetic flux acts and a second voltage vector component in a direction which is orthogonal to the direction in which the stator interlinkage magnetic flux acts for the voltage command of the drive voltage, and sets the voltage command of the drive voltage based on the first voltage vector component and the second voltage vector component.Type: GrantFiled: March 1, 2021Date of Patent: March 8, 2022Assignees: KABUSHIKI KAISHA TOSHIBA, Toshiba Electronic Devices & Storage CorporationInventors: Takashi Takagi, Toshimitsu Aizawa, Shen Wang
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Publication number: 20210281205Abstract: A driving device of one embodiment includes a phase estimator and a voltage controller. The phase estimator estimates a phase of stator interlinkage magnetic flux of an electric motor based on a current flowing through the electric motor, a voltage command of a drive voltage applied to the electric motor, and a winding resistance value of the electric motor. The voltage controller acquires a first voltage vector component in a direction in which the stator interlinkage magnetic flux acts and a second voltage vector component in a direction which is orthogonal to the direction in which the stator interlinkage magnetic flux acts for the voltage command of the drive voltage, and sets the voltage command of the drive voltage based on the first voltage vector component and the second voltage vector component.Type: ApplicationFiled: March 1, 2021Publication date: September 9, 2021Applicants: KABUSHIKI KAISHA TOSHIBA, Toshiba Electronic Devices & Storage CorporationInventors: Takashi TAKAGI, Toshimitsu AIZAWA, Shen WANG
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Publication number: 20200295687Abstract: According to one embodiment, a driving device includes a voltage controller, a parameter setter, and a phase adjuster. The voltage controller causes an electric power converter to apply a drive voltage to the electric motor, the electric power converter converting input electric power to A/C electric power having desired voltage and frequency and supplying the converted electric power to an electric motor. The parameter setter sets at least one of a rotation speed of the electric motor and a parameter related to the rotation speed as speed information. The phase adjuster adjusts a phase of the drive voltage in such a manner that an index calculated based on a current flowing in the electric motor and the speed information set in the parameter setter becomes smaller.Type: ApplicationFiled: December 23, 2019Publication date: September 17, 2020Applicants: KABUSHIKI KAISHA TOSHIBA, Toshiba Electronic Devices & Storage CorporationInventors: Takashi TAKAGI, Toshimitsu AIZAWA, Shen WANG
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Patent number: 10630213Abstract: A motor control integrated circuit according to embodiments outputs predetermined PWM signals to an inverter circuit that drives a synchronous motor and is configured to perform on-off control on a plurality of three-phase bridge connected switching elements in accordance with the PWM signals to convert direct current into three-phase alternating current, and includes: a PWM generation unit configured to generate the signals based on a received speed command value and output the PWM signals; and a current detection unit configured to detect differential values of phase currents at a predetermined time point that is fixed within a period of a carrier wave used for PWM control, based on the carrier wave and a signal generated by a current detector for detecting current conducted to the synchronous motor, wherein the PWM generation unit calculates a speed of the synchronous motor based on the differential values and then, based on the speed, generates the PWM signals to be applied to the synchronous motor.Type: GrantFiled: September 18, 2018Date of Patent: April 21, 2020Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Sari Maekawa, Shinichi Kominato, Toshimitsu Aizawa, Naoki Oomura, Junichiro Hagura, Sadao Ikeda
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Patent number: 10630221Abstract: A motor control device including a PWM generator generating a PWM generator generating a PWM signal to be outputted to a drive circuit that energizes a winding of a switched reluctance motor; a rectangular wave generator outputting a rectangular wave signal of 1 pulse or more to the drive circuit in 1 drive period of each phase based on a rotational position of the motor; and a drive signal switcher executing switching so that a PWM drive by the PWM signal is performed when a rotational speed of the motor is equal to or less than a threshold value and a rectangular wave drive by the rectangular wave signal is performed when the rotational speed of the motor is greater than the threshold value. The PWM generator synchronizes a timing to start generation of a carrier of the PWM signal with rising of the rectangular wave signal.Type: GrantFiled: July 25, 2017Date of Patent: April 21, 2020Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Toshimitsu Aizawa, Makoto Shinohara, Shigeru Nakajima
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Publication number: 20190312534Abstract: According to an embodiment of the present invention, a control circuit of a motor drive device activates a first timer according to the rotational position of a motor, controls, on the basis of the time counted by the first timer, the on-timing of positive-side switching elements that constitute an inverter circuit, and energizes the motor. The control circuit also activates a second timer according to the on-timing, controls the off-timing of the positive-side switching elements, on the basis of the time counted by the second timer, sets negative-side switching elements of two opposing arms to be in an on-state to cause a reflux current to flow, and then changes an energization direction to the motor. When the rotational position is set to a position for activating the first timer before the on-timing, turning on of the positive-side switching elements and activation of the second timer, which are scheduled to be performed at the on-timing, are carried out.Type: ApplicationFiled: June 24, 2019Publication date: October 10, 2019Applicant: Toshiba Lifestyle Products & Services CorporationInventor: Toshimitsu AIZAWA
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Publication number: 20190089274Abstract: A motor control integrated circuit according to embodiments outputs predetermined PWM signals to an inverter circuit that drives a synchronous motor and is configured to perform on-off control on a plurality of three-phase bridge connected switching elements in accordance with the PWM signals to convert direct current into three-phase alternating current, and includes: a PWM generation unit configured to generate the signals based on a received speed command value and output the PWM signals; and a current detection unit configured to detect differential values of phase currents at a predetermined time point that is fixed within a period of a carrier wave used for PWM control, based on the carrier wave and a signal generated by a current detector for detecting current conducted to the synchronous motor, wherein the PWM generation unit calculates a speed of the synchronous motor based on the differential values and then, based on the speed, generates the PWM signals to be applied to the synchronous motor.Type: ApplicationFiled: September 18, 2018Publication date: March 21, 2019Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Sari MAEKAWA, Shinichi Kominato, Toshimitsu Aizawa, Naoki Oomura, Junichiro Hagura, Sadao Ikeda
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Publication number: 20180331639Abstract: A motor drive device of an embodiment includes: a power conversion circuit configured by connecting, in parallel, a plurality of legs respectively including series circuits of respective positive-side and negative-side switching elements, the power conversion circuit driving a motor; a control circuit generating and outputting an on/off signal to each of the switching elements constituting the power conversion circuit to control the motor; a rotational position detector detecting a rotational position of the motor; a rectifier full-wave rectifying input AC power supply voltage and outputting an obtained full-wave rectified voltage; and a voltage detector detecting the full-wave rectified voltage.Type: ApplicationFiled: May 14, 2018Publication date: November 15, 2018Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Toshimitsu Aizawa
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Publication number: 20180034400Abstract: A motor control device including a PWM generator generating a PWM generator generating a PWM signal to be outputted to a drive circuit that energizes a winding of a switched reluctance motor; a rectangular wave generator outputting a rectangular wave signal of 1 pulse or more to the drive circuit in 1 drive period of each phase based on a rotational position of the motor; and a drive signal switcher executing switching so that a PWM drive by the PWM signal is performed when a rotational speed of the motor is equal to or less than a threshold value and a rectangular wave drive by the rectangular wave signal is performed when the rotational speed of the motor is greater than the threshold value. The PWM generator synchronizes a timing to start generation of a carrier of the PWM signal with rising of the rectangular wave signal.Type: ApplicationFiled: July 25, 2017Publication date: February 1, 2018Applicant: Kabushiki Kaisha ToshibaInventors: Toshimitsu AIZAWA, Makoto Shinohara, Shigeru Nakajima
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Patent number: 9225271Abstract: A motor driving apparatus according to an embodiment includes a brushless motor. The motor driving apparatus includes a position sensor that outputs a position detection signal in synchronization with a phase of an induced voltage of a coil of the brushless motor. The motor driving apparatus includes a semiconductor integrated circuit that controls driving of the brushless motor by supplying a pseudo sine-wave driving voltage from an energization terminal to the coil of the brushless motor based on the position detection signal and a command signal that prescribes driving of the brushless motor.Type: GrantFiled: August 21, 2014Date of Patent: December 29, 2015Assignee: Kabushiki Kaisha ToshibaInventors: Naoki Oomura, Kazunobu Nagai, Toshimitsu Aizawa, Sadao Ikeda, Jun Sodesawa, Hiroyuki Ishida
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Publication number: 20150054437Abstract: A motor driving apparatus according to an embodiment includes a brushless motor. The motor driving apparatus includes a position sensor that outputs a position detection signal in synchronization with a phase of an induced voltage of a coil of the brushless motor. The motor driving apparatus includes a semiconductor integrated circuit that controls driving of the brushless motor by supplying a pseudo sine-wave driving voltage from an energization terminal to the coil of the brushless motor based on the position detection signal and a command signal that prescribes driving of the brushless motor.Type: ApplicationFiled: August 21, 2014Publication date: February 26, 2015Inventors: Naoki Oomura, Kazunobu Nagai, Toshimitsu Aizawa, Sadao Ikeda, Jun Sodesawa, Hiroyuki Ishida
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Patent number: 8441219Abstract: A motor control device controlling an inverter to control an electric motor, includes a plurality of function sections, a voltage command generating section generating a d-axis voltage command and a q-axis voltage command, a voltage operational processing section, an input current operation section, a speed information generating section estimating a rotational speed of the motor based on at least one of a motor constant, a positional information generating section delivering positional information about a rotor, and a processor executing control software set by a user or a manufacturer. At least a part of the function sections are configured by hardware. The function section configured by the hardware is given at least one parameter retaining section. The parameter retaining section is configured so as to be readable/writable on the processor. The function section is configured by the hardware so as to be operated in a predetermined sequence.Type: GrantFiled: September 15, 2010Date of Patent: May 14, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Shuting Li, Nobuyuki Suzuki, Toshikazu Sekihara, Kazunobu Nagai, Yukihisa Hasegawa, Toshimitsu Aizawa, Sari Maekawa
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Publication number: 20110062903Abstract: A motor control device controlling an inverter to control an electric motor, includes a plurality of function sections, a voltage command generating section generating a d-axis voltage command and a q-axis voltage command, a voltage operational processing section, an input current operation section, a speed information generating section estimating a rotational speed of the motor based on at least one of a motor constant, a positional information generating section delivering positional information about a rotor, a processor executing control software set by a user, a manufacturer or the like. At least a part of the function sections are configured by hardware. The function section configured by the hardware is given at least one parameter retaining section. The parameter retaining section is configured so as to be readable/writable on the processor. The function section is configured by the hardware so as to be operated in a predetermined sequence.Type: ApplicationFiled: September 15, 2010Publication date: March 17, 2011Applicant: Kabushiki Kaisha ToshibaInventors: Shuting LI, Nobuyuki Suzuki, Toshikazu Sekihara, Kazunobu Nagai, Yukihisa Hasegawa, Toshimitsu Aizawa, Sari Maekawa
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Patent number: 7638967Abstract: A motor control unit includes a power converter unit that energize a motor based on a commutating signal, the motor having a rotor provided with a permanent magnet and a stator having a coil wound thereto; a start-up controller that outputs a commutating signal to the power converter unit during a start-up operation, the commutating signal having a predetermined conductive pattern corresponding to a command rotational speed; a voltage calculator that calculates a voltage of the motor during the start-up operation by applying a parameter for the motor, the command rotational speed, and a current flown in the coil of the motor to a voltage-current equation of the motor; and a determiner that, during the start-up operation, compares a voltage calculated by the voltage calculator and an actual voltage of the motor and that determines occurrence of rotational abnormalities when the actual voltage is lower than the calculated voltage.Type: GrantFiled: June 28, 2007Date of Patent: December 29, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Toshimitsu Aizawa, Tsuyoshi Hosoito
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Publication number: 20080042613Abstract: A motor control unit includes a power converter unit that energize a motor based on a commutating signal, the motor having a rotor provided with a permanent magnet and a stator having a coil wound thereto; a start-up controller that outputs a commutating signal to the power converter unit during a start-up operation, the commutating signal having a predetermined conductive pattern corresponding to a command rotational speed; a voltage calculator that calculates a voltage of the motor during the start-up operation by applying a parameter for the motor, the command rotational speed, and a current flown in the coil of the motor to a voltage-current equation of the motor; and a determiner that, during the start-up operation, compares a voltage calculated by the voltage calculator and an actual voltage of the motor and that determines occurrence of rotational abnormalities when the actual voltage is lower than the calculated voltage.Type: ApplicationFiled: June 28, 2007Publication date: February 21, 2008Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Toshimitsu Aizawa, Tsuyoshi Hosoito