Patents by Inventor Hajime Uematsu
Hajime Uematsu 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: 9479106Abstract: In a control apparatus, a target harmonic current obtainer obtains, according to a phase current flowing through at least one phase winding of a stator, a target harmonic current component flowing in a rotary machine. The target harmonic current component is included in a fundamental current component of the phase current. An inducing unit superimposes, on the phase information, a fluctuating signal that changes at an angular velocity identical to an angular velocity of the target harmonic current component, to induce a counteracting harmonic current component in the at least one phase winding. The counteracting harmonic current component counteracts the target harmonic current component.Type: GrantFiled: July 24, 2015Date of Patent: October 25, 2016Assignee: DENSO CORPORATIONInventors: Yasuhiro Nakai, Hajime Uematsu
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Patent number: 9419553Abstract: In a control apparatus, a target harmonic current obtainer obtains, according to a phase current flowing through at least one phase winding of a stator of a rotary machine, a target harmonic current component flowing in the rotary machine. The target harmonic current component correlates with a fundamental current component of a phase current. An inducing unit superimposes, on at least one of the amplitude and the phase of an output voltage vector of a power converter used by a switching unit, a harmonic signal that changes at an angular velocity identical to an angular velocity of the target harmonic current component. This induces a counteracting harmonic current component in the at least one phase winding. The counteracting harmonic current component counteracts the target harmonic current component.Type: GrantFiled: July 21, 2015Date of Patent: August 16, 2016Assignee: DENSO CORPORATIONInventors: Yasuhiro Nakai, Hajime Uematsu
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Patent number: 9413278Abstract: A control device for a rotating electrical machine is provided that is capable of suppressing reduction in controllability of torque attributed to harmonic currents. According to the exemplary embodiment of the present invention, a designated torque value Trq* designated by a hybrid vehicle electronic control unit (HVECU) is corrected by a compensation amount ?Trq calculated using a harmonic voltage Vh, the designated torque value Trq*, and an electric angular velocity ? as inputs. An operating signal generating section generates an operating signal g¥# using a designated norm value Vn set based on the corrected torque designated value Trq* and a phase ? serving as a manipulated variable for performing feedback control of an estimated torque to the designated torque value Trq*, and outputs the generated operating signal g¥# to a power supply circuit of a motor generator.Type: GrantFiled: July 1, 2013Date of Patent: August 9, 2016Assignee: DENSO CORPORATIONInventors: Koichi Nishibata, Hiroya Tsuji, Hajime Uematsu
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Publication number: 20160028339Abstract: In a control apparatus, a target harmonic current obtainer obtains, according to a phase current flowing through at least one phase winding of a stator, a target harmonic current component flowing in a rotary machine. The target harmonic current component is included in a fundamental current component of the phase current. An inducing unit superimposes, on the phase information, a fluctuating signal that changes at an angular velocity identical to an angular velocity of the target harmonic current component, to induce a counteracting harmonic current component in the at least one phase winding. The counteracting harmonic current component counteracts the target harmonic current component.Type: ApplicationFiled: July 24, 2015Publication date: January 28, 2016Inventors: Yasuhiro NAKAI, Hajime UEMATSU
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Publication number: 20160028340Abstract: In a control apparatus, a target harmonic current obtainer obtains, according to a phase current flowing through at least one phase winding of a stator of a rotary machine, a target harmonic current component flowing in the rotary machine. The target harmonic current component correlates with a fundamental current component of a phase current. An inducing unit superimposes, on at least one of the amplitude and the phase of an output voltage vector of a power converter used by a switching unit, a harmonic signal that changes at an angular velocity identical to an angular velocity of the target harmonic current component. This induces a counteracting harmonic current component in the at least one phase winding. The counteracting harmonic current component counteracts the target harmonic current component.Type: ApplicationFiled: July 21, 2015Publication date: January 28, 2016Inventors: Yasuhiro NAKAI, Hajime UEMATSU
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Patent number: 9136788Abstract: Disclosed is a motor control apparatus for controlling a synchronous motor, which includes a receiver section for receiving the value detected by a temperature sensor installed inside the synchronous motor. The synchronous motor is started up with the current fed into it, whose magnitude is changed in accordance with the temperature received by the receiver section at the time of starting up the synchronous motor. In this way, the stable startup of the synchronous motor can be guaranteed and the useful life of the semiconductor elements can also be prolonged.Type: GrantFiled: February 16, 2009Date of Patent: September 15, 2015Assignee: Hitachi, Ltd.Inventors: Tomofumi Okubo, Norinaga Suzuki, Hajime Uematsu, Hideharu Tanaka, Masakazu Hase, Yoshiyuki Taguchi
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Patent number: 9124208Abstract: In a vehicle, a control apparatus controls a power converter supplying a rotary machine which can operate as a drive motor of the vehicle, and controls a cooling apparatus for circulating a coolant fluid through the rotary machine and the power converter. When a temporary condition occurs immediately after commencement of the circulation, whereby the temperatures of the coolant fluid and of switching elements in the power converter are judged to concurrently exceed respective specified temperature thresholds, the control apparatus limits the maximum power that can be supplied from the power converter to a lower value than is normally available. When the temperature of the coolant fluid is judged to no longer exceed the corresponding temperature threshold, the limiting is released.Type: GrantFiled: May 8, 2013Date of Patent: September 1, 2015Assignee: DENSO CORPORATIONInventors: Hiroshi Inamura, Hajime Uematsu, Takayuki Kakihara
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Publication number: 20140001991Abstract: A control device for a rotating electrical machine is provided that is capable of suppressing reduction in controllability of torque attributed to harmonic currents. According to the exemplary embodiment of the present invention, a designated torque value Trq* designated by a hybrid vehicle electronic control unit (HVECU) is corrected by a compensation amount ?Trq calculated using a harmonic voltage Vh, the designated torque value Trq*, and an electric angular velocity ? as inputs. An operating signal generating section generates an operating signal g¥# using a designated norm value Vn set based on the corrected torque designated value Trq* and a phase ? serving as a manipulated variable for performing feedback control of an estimated torque to the designated torque value Trq*, and outputs the generated operating signal g¥# to a power supply circuit of a motor generator.Type: ApplicationFiled: July 1, 2013Publication date: January 2, 2014Inventors: Koichi NISHIBATA, Hiroya TSUJI, Hajime UEMATSU
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Publication number: 20130300332Abstract: In a vehicle, a control apparatus controls a power converter supplying a rotary machine which can operate as a drive motor of the vehicle, and controls a cooling apparatus for circulating a coolant fluid through the rotary machine and the power converter. When a temporary condition occurs immediately after commencement of the circulation, whereby the temperatures of the coolant fluid and of switching elements in the power converter are judged to concurrently exceed respective specified temperature thresholds, the control apparatus limits the maximum power that can be supplied from the power converter to a lower value than is normally available. When the temperature of the coolant fluid is judged to no longer exceed the corresponding temperature threshold, the limiting is released.Type: ApplicationFiled: May 8, 2013Publication date: November 14, 2013Applicant: DENSO CORPORATIONInventors: Hiroshi INAMURA, Hajime UEMATSU, Takayuki KAKIHARA
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Publication number: 20110056226Abstract: Disclosed is a motor control apparatus for controlling a synchronous motor, which includes a receiver section for receiving the value detected by a temperature sensor installed inside the synchronous motor. The synchronous motor is started up with the current fed into it, whose magnitude is changed in accordance with the temperature received by the receiver section at the time of starting up the synchronous motor. In this way, the stable startup of the synchronous motor can be guaranteed and the useful life of the semiconductor elements can also be prolonged.Type: ApplicationFiled: February 16, 2009Publication date: March 10, 2011Applicant: Hitachi, Ltd.Inventors: Tomofumi Okubo, Norinaga Suzuki, Hajime Uematsu, Hideharu Tanaka, Masakazu Hase, Yoshiyuki Taguchi
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Patent number: 7808202Abstract: In a driving system for an inverter that uses a diode rectifying circuit to convert a single-phase or three-phase AC voltage to a desired DC voltage and drives a permanent magnet motor, a DC-voltage pulsating frequency is estimated from a pulsating frequency setting calculated from the power supply frequency of an AC voltage and the detected current values of the inverter, and the resulting estimated pulsating frequency value and detected current values are used to correct the output voltage of the inverter.Type: GrantFiled: December 28, 2007Date of Patent: October 5, 2010Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Kazuaki Tobari, Yoshitaka Iwaji, Kiyoshi Sakamoto, Hajime Uematsu, Masakazu Hase
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Patent number: 7719226Abstract: Current command values are used instead of detected current values to estimate axis error by calculation. An axis error command value is generated according to a speed command value, and a difference between the generated axis error command value and the estimated axis error value is used to control an estimated frequency value.Type: GrantFiled: December 27, 2007Date of Patent: May 18, 2010Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Kazuaki Tobari, Yoshitaka Iwaji, Daigo Kaneko, Hajime Uematsu, Masakazu Hase
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Patent number: 7602138Abstract: An apparatus for controlling the drive of an electric motor, having a current detector for detecting the current through an externally connected electric motor; a controller for generating a control signal to control the electric motor on the basis of the current detected by the current detector and the speed command for specifying the rotational speed of the electric motor; wherein the apparatus includes a load estimator for estimating the mechanical load condition associated with the electric motor on the basis of the current detected by the current detector and the speed command, and the controller controls the electric motor current on the basis of the detected current, the speed command and the estimated load condition.Type: GrantFiled: September 27, 2006Date of Patent: October 13, 2009Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Daigo Kaneko, Takahiro Suzuki, Tsunehiro Endo, Kazuaki Tobari, Hajime Uematsu
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Publication number: 20080157710Abstract: In a driving system for an inverter that uses a diode rectifying circuit to convert a single-phase or three-phase AC voltage to a desired DC voltage and drives a permanent magnet motor, a DC-voltage pulsating frequency is estimated from a pulsating frequency setting calculated from the power supply frequency of an AC voltage and the detected current values of the inverter, and the resulting estimated pulsating frequency value and detected current values are used to correct the output voltage of the inverter.Type: ApplicationFiled: December 28, 2007Publication date: July 3, 2008Inventors: Kazuaki Tobari, Yoshitaka Iwaji, Kiyoshi Sakamoto, Hajime Uematsu, Masakazu Hase
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Publication number: 20080157709Abstract: Current command values are used instead of detected current values to estimate axis error by calculation. An axis error command value is generated according to a speed command value, and a difference between the generated axis error command value and the estimated axis error value is used to control an estimated frequency value.Type: ApplicationFiled: December 27, 2007Publication date: July 3, 2008Inventors: Kazuaki Tobari, Yoshitaka Iwaji, Daigo Kaneko, Hajime Uematsu, Masakazu Hase
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Publication number: 20070159130Abstract: An apparatus for controlling the drive of an electric motor, having a current detector for detecting the current through an externally connected electric motor; a controller for generating a control signal to control the electric motor on the basis of the current detected by the current detector and the speed command for specifying the rotational speed of the electric motor; wherein the apparatus includes a load estimator for estimating the mechanical load condition associated with the electric motor on the basis of the current detected by the current detector and the speed command, and the controller controls the electric motor current on the basis of the detected current, the speed command and the estimated load condition.Type: ApplicationFiled: September 27, 2006Publication date: July 12, 2007Inventors: Daigo Kaneko, Takahiro Suzuki, Tsunehiro Endo, Kazuaki Tobari, Hajime Uematsu
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Patent number: 5758516Abstract: To permit an engage ring or a marriage ring to be worn on the body without fitting on any finger, a case constituted by a body and a lid is provided with a ring accommodating section to fully or partly accommodate a ring. The case is also provided with a an attaching tool, such as a pin to be attached to the clothing or a chain to be worn round the neck. The case may be made transparent or semitransparent so that an accommodated ring in it can be seen from the outside. The case has openings to permit a portion of the accommodated ring to project or be exposed outward and be seen from the outside. The case may be provided with a plurality of ring accommodating sections in the forms of circular grooves having different diameters for accommodating the ring part of a ring.Type: GrantFiled: August 8, 1996Date of Patent: June 2, 1998Inventor: Hajime Uematsu