Patents by Inventor Tatsuya Kitamura
Tatsuya Kitamura 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: 20170373353Abstract: A plurality of required DC voltages are outputted. A power supply device includes: a first switch circuit corresponding to the plurality of battery devices, and that includes a switch for connecting a negative pole terminal, by which negative pole terminals of the battery devices are connected, and a first switch for connecting a positive pole terminal, by which positive pole terminals of the battery devices are connected, and a switch for bypassing, by which the battery devices are bypassed; and a second switch circuit corresponding to the plurality of battery devices, and that includes a second switch for connecting a positive pole terminal, by which positive pole terminals of the battery devices are connected, and a switch for connecting, by which the negative pole terminals of the battery devices are connected to a positive pole terminal of the other battery device.Type: ApplicationFiled: January 21, 2016Publication date: December 28, 2017Applicant: Mitsubishi Electric CorporationInventors: Yohei TAN, Tatsuya KITAMURA, Takahiko YAMAMURO
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Patent number: 9539909Abstract: Phase coils are each configured by winding a conductor wire in a concentrated winding consecutively on three circumferentially consecutive tooth portions, six inverter units of an inverter module are each disposed in close proximity to a motor so as to face each of the phase coils axially, and the motor and the inverter module are electrically connected by connecting an alternating-current output terminals of each of the plurality of inverter units to output wires of the phase coils that face the inverter units axially.Type: GrantFiled: January 20, 2011Date of Patent: January 10, 2017Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Moriyuki Hazeyama, Yoshihiro Miyama, Masaya Inoue, Yoshiko Obiraki, Tatsuya Kitamura
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Patent number: 8866353Abstract: A first inverter ventilation aperture is disposed so as to pass through a portion of a fin base that faces a bearing, a first rotor ventilation aperture is disposed so as to pass through a portion of a bottom surface portion that faces the bearing, and a first cooling airflow ventilation channel is formed in which a cooling airflow flows radially inward through radiating fins, then flows toward a first surface side of a mount portion through the first inverter ventilation aperture, flows axially through an interior portion of a stator core, and then flows out between the bottom surface portion and a base portion through the first rotor ventilation aperture, and subsequently flows radially outward between the bottom surface portion and the base portion due to rotational driving of a centrifugal fan.Type: GrantFiled: January 20, 2011Date of Patent: October 21, 2014Assignee: Mitsubishi Electric CorporationInventors: Yoshihiro Miyama, Moriyuki Hazeyama, Masaya Inoue, Yoshiko Obiraki, Tatsuya Kitamura
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Patent number: 8598920Abstract: A gate driving circuit for driving a voltage-driven switching device is provided with a current limiting circuit for limiting a gate current ig that flows into a gate terminal through a gate resistor at turn-on to a current limit value IL which defines an upper limit value. The current limit value IL is set at a value which is larger than a gate current value I2 at turn-on of the switching device during a period when the Miller effect occurs but is smaller than a gate current value I1 at a point in time when a main current begins to flow at turn-on in a case where the gate current ig is not limited by the current limiting circuit. This arrangement makes a variation in a collector current of the switching device moderate at turn-on thereof when the collector current begins to flow, thereby reducing high-frequency noise.Type: GrantFiled: May 7, 2010Date of Patent: December 3, 2013Assignee: Mitsubishi Electric CorporationInventors: Hiroshi Nakatake, Shinichi Kinouchi, Tatsuya Kitamura
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Patent number: 8519751Abstract: A gate drive circuit capable of turning on a semiconductor switching element at high speed, which includes: a buffer circuit including a turn-on-drive switching element and a turn-off-drive switching element that are complementarily turned on and off, for driving the semiconductor switching element; a first DC voltage supply including a positive electrode connected to the source or emitter of the turn-on-drive switching element and a negative electrode connected to a reference potential; and a second DC voltage supply including a positive electrode connected to the source or emitter of the turn-off-drive switching element and a negative electrode connected to the reference potential.Type: GrantFiled: September 2, 2010Date of Patent: August 27, 2013Assignee: Mitsubishi Electric CorporationInventors: Tatsuya Kitamura, Hiroshi Nakatake, Yasushi Nakayama
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Publication number: 20120319542Abstract: Phase coils are each configured by winding a conductor wire in a concentrated winding consecutively on three circumferentially consecutive tooth portions, six inverter units of an inverter module are each disposed in close proximity to a motor so as to face each of the phase coils axially, and the motor and the inverter module are electrically connected by connecting an alternating-current output terminals of each of the plurality of inverter units to output wires of the phase coils that face the inverter units axially.Type: ApplicationFiled: January 20, 2011Publication date: December 20, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Moriyuki Hazeyama, Yoshihiro Miyama, Masaya Inoue, Yoshiko Obiraki, Tatsuya Kitamura
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Publication number: 20120299407Abstract: A first inverter ventilation aperture is disposed so as to pass through a portion of a fin base that faces a bearing, a first rotor ventilation aperture is disposed so as to pass through a portion of a bottom surface portion that faces the bearing, and a first cooling airflow ventilation channel is formed in which a cooling airflow flows radially inward through radiating fins, then flows toward a first surface side of a mount portion through the first inverter ventilation aperture, flows axially through an interior portion of a stator core, and then flows out between the bottom surface portion and a base portion through the first rotor ventilation aperture, and subsequently flows radially outward between the bottom surface portion and the base portion due to rotational driving of a centrifugal fan.Type: ApplicationFiled: January 20, 2011Publication date: November 29, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yoshihiro Miyama, Moriyuki Hazeyama, Masaya Inoue, Yoshiko Obiraki, Tatsuya Kitamura
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Publication number: 20120153998Abstract: A gate drive circuit capable of turning on a semiconductor switching element at high speed, which includes: a buffer circuit including a turn-on-drive switching element and a turn-off-drive switching element that are complementarily turned on and off, for driving the semiconductor switching element; a first DC voltage supply including a positive electrode connected to the source or emitter of the turn-on-drive switching element and a negative electrode connected to a reference potential; and a second DC voltage supply including a positive electrode connected to the source or emitter of the turn-off-drive switching element and a negative electrode connected to the reference potential.Type: ApplicationFiled: September 2, 2010Publication date: June 21, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Tatsuya Kitamura, Hiroshi Nakatake, Yasushi Nakayama
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Publication number: 20120013371Abstract: A gate driving circuit for driving a voltage-driven switching device is provided with a current limiting circuit for limiting a gate current ig that flows into a gate terminal through a gate resistor at turn-on to a current limit value IL which defines an upper limit value. The current limit value IL is set at a value which is larger than a gate current value I2 at turn-on of the switching device during a period when the Miller effect occurs but is smaller than a gate current value I1 at a point in time when a main current begins to flow at turn-on in a case where the gate current ig is not limited by the current limiting circuit. This arrangement makes a variation in a collector current of the switching device moderate at turn-on thereof when the collector current begins to flow, thereby reducing high-frequency noise.Type: ApplicationFiled: May 7, 2010Publication date: January 19, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Hiroshi Nakatake, Shinichi Kinouchi, Tatsuya Kitamura
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Patent number: 7617102Abstract: A speaker identifying apparatus includes: a module for performing a principal component analysis on predetermined vocal tract geometrical parameters of a plurality of speakers and calculating an average and principal component vectors representing speaker-dependent variation; a module for performing acoustic analysis on the speech data being uttered for each of the speakers to calculate cepstrum coefficients; a module for calculating principal component coefficients for approximating the vocal tract geometrical parameter of each of the plurality of speakers by a linear sum of principal component coefficients; a module for determining, by multiple regression analysis, a coefficient sequence for estimating principal component coefficients by a linear sum of the plurality of prescribed features, for each of the plurality of speakers; a module for calculating a plurality of features from speech data of the speaker to be identified, and estimating principal component coefficients for calculating the vocal tract geType: GrantFiled: September 27, 2006Date of Patent: November 10, 2009Assignee: Advanced Telecommunications Research Institute InternationalInventors: Parham Mokhtari, Tatsuya Kitamura, Hironori Takemoto, Seiji Adachi, Kiyoshi Honda
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Publication number: 20070106511Abstract: A speaker identifying apparatus includes: a module for performing a principal component analysis on predetermined vocal tract geometrical parameters of a plurality of speakers and calculating an average and principal component vectors representing speaker-dependent variation; a module for performing acoustic analysis on the speech data being uttered for each of the speakers to calculate cepstrum coefficients; a module for calculating principal component coefficients for approximating the vocal tract geometrical parameter of each of the plurality of speakers by a linear sum of principal component coefficients; a module for determining, by multiple regression analysis, a coefficient sequence for estimating principal component coefficients by a linear sum of the plurality of prescribed features, for each of the plurality of speakers; a module for calculating a plurality of features from speech data of the speaker to be identified, and estimating principal component coefficients for calculating the vocal tract geType: ApplicationFiled: September 27, 2006Publication date: May 10, 2007Inventors: Parham Mokhtari, Tatsuya Kitamura, Hironori Takemoto, Seiji Adachi, Kiyoshi Honda
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Patent number: 6599467Abstract: The invention provides a process for forging a titanium-based material comprises the steps of: preparing a titanium-based sintered workpiece including at least one of ceramics particles and pores in a total amount of 1% or more by volume, the ceramics particles being thermodynamically stable in a titanium alloy; and heating the workpiece to a forging temperature and forging the same. In the production process, the pores or the ceramics particles inhibit the grain growth during forging. Accordingly, it is possible to carry out the forging at a relatively high temperature at which the titanium-based material exhibits a small resistance to deformation. Moreover, the titanium-based material can maintain an appropriate microstructure even after the forging. Consequently, the impact value and the fatigue strength are inhibited from decreasing.Type: GrantFiled: October 15, 1999Date of Patent: July 29, 2003Assignees: Toyota Jidosha Kabushiki Kaisha, Aisan Kogyo Kabushiki KaishaInventors: Toshiya Yamaguchi, Akio Hotta, Yoshinori Shibata, Tadahiko Furuta, Takashi Saito, Satoru Iwase, Takashi Haruta, Tatsuya Kitamura
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Publication number: 20030041071Abstract: The present invention provides a database for implementing in a straightforward manner the sharing of a variety of touchpoint information between departments in an enterprise or the sharing of a variety of touchpoint information between enterprises.Type: ApplicationFiled: August 21, 2002Publication date: February 27, 2003Applicant: KOMATSU LTD.Inventors: Hideyuki Wakai, Takashi Kurihara, Hirobumi Miwa, Tatsuya Kitamura, Akihiro Takiguchi, Junbo Song
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Patent number: 5774629Abstract: An apparatus for correctly inferring the causes of a failure of driving machine or the like. Each time a true cause is found, the data on the degree of relevance of the cause is so corrected that the degree of the other causes becomes high and those of the other causes become low. On the basis of the data on the failure rate and the data on the degree of the relevance, the certainty of each cause is inferred by a first inferring means. The data on the predicted failure rate of each cause and the data on the actual failure rate are compared, and the certainty of each cause is inferred by a second inferring means in such a way that the certainty of a cause having less errors becomes higher. The certainties inferred by the first and second inferring means are weighted in a predetermined way. Based upon these weighted certainties, final certainties are inferred.Type: GrantFiled: December 20, 1995Date of Patent: June 30, 1998Assignee: Komatsu Ltd.Inventors: Hiroyoshi Yamaguchi, Tatsuya Kitamura, Kunitoshi Suzuki
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Patent number: 5621158Abstract: A measurement value judgment method for comparing measurement values from sensors provided at various locations of a system with pre-set reference values, and judging, based on the results of the comparison so made, whether the system is normal or abnormal, comprises the steps of judging a quantity of state relative to the load on the system and changing the reference values in response to the results of the judgement, the thereby judging accurately whether or not the system and sensors are in an abnormal status by accurately identifying the operating state of the system.Type: GrantFiled: June 6, 1996Date of Patent: April 15, 1997Assignee: Komatsu Ltd.Inventors: Tatsuya Kitamura, Tatsuya Ariga