Patents by Inventor Kotaro Kataoka
Kotaro Kataoka 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: 12040729Abstract: A motor control device includes an inverter circuit to convert a DC power source voltage into a three-phase AC voltage and supply the three-phase AC voltage to the three-phase motor and a controller to generate three-phase PWM signals based on three-phase duty command values updated at a predetermined updating cycle and control the inverter circuit based on the three-phase PWM signals. The controller is configured or programmed to shift, when duty command values of at least two phases of the three-phase duty command values updated at a first update timing are the same, the duty command value of one phase of the duty command values of the two phases by a predetermined shift amount and shifts a duty command value of the one phase of the three-phase duty command values updated at a second update timing which is an update timing next to the first update timing by the shift amount in a direction opposite to a shift direction at the first update timing.Type: GrantFiled: June 23, 2022Date of Patent: July 16, 2024Assignees: NIDEC CORPORATION, NIDEC ELESYS CORPORATIONInventors: Takashi Koikegami, Isao Sanbonmatsu, Akihiro Okamura, Tomohiro Fukumura, Kotaro Kataoka
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Publication number: 20240154560Abstract: A power conversion device converts DC power into n-phase AC power. A first voltage and a second voltage lower than the first voltage are applied to the power conversion device, and the power conversion device outputs an n-phase output voltage based on a modulation factor. n is the number of phases of the AC output, and is an odd number of 3 or more. At a low modulation factor equal to or less than a first modulation factor, the output voltage becomes a sinusoidal output. At the second modulation factor larger than the first modulation factor, the output voltage is switched every electrical angle ?/n between the phase in which the output voltage is fixed to the maximum voltage and the phase in which the output voltage is fixed to the minimum voltage.Type: ApplicationFiled: June 11, 2021Publication date: May 9, 2024Applicant: NIDEC CORPORATIONInventor: Kotaro KATAOKA
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Publication number: 20240128916Abstract: An inverter circuit includes at least three output terminals, a first input terminal, a second input terminal, and at least three series bodies. A total switching duration and a one-phase fixed duration are present within a single cycle of AC output. The waveform of each phase of an output voltage is such that a shared offset wave is deducted from a sinusoidal waveform. The waveform of the offset wave matches one phase of the sinusoidal waveform, or matches a waveform obtained by shifting the one phase of the sinusoidal waveform in the amplitude direction, during the one-phase fixed duration. During switching between the total switching duration and the one-phase fixed duration, the inclination of the waveform of the offset wave either continuously changes or remains fixed.Type: ApplicationFiled: January 12, 2022Publication date: April 18, 2024Applicant: NIDEC CORPORATIONInventor: Kotaro KATAOKA
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Publication number: 20230118493Abstract: An opposing electrode determination method includes a step of inserting a pair of opposing electrodes into corresponding receiving portions, respectively, by holding, between the pair of opposing electrodes, a held member formed with the receiving portions on both sides; a step of measuring the inter-electrode distance between the pair of opposing electrodes; and a step of determining, based on the inter-electrode distance, whether a combination of the pair of opposing electrodes is correct or incorrect. The receiving portions are configured to have different insertion allowances for the opposing electrodes, respectively, according to the tip shape of each of the pair of opposing electrodes.Type: ApplicationFiled: February 9, 2021Publication date: April 20, 2023Applicant: MAZDA MOTOR CORPORATIONInventors: Naotake ISHIZAKI, Kotaro KATAOKA, Keiko FUKUNAGA
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Publication number: 20220416712Abstract: A motor control device includes an inverter circuit to convert a DC power source voltage into a three-phase AC voltage and supply the three-phase AC voltage to the three-phase motor and a controller to generate three-phase PWM signals based on three-phase duty command values updated at a predetermined updating cycle and control the inverter circuit based on the three-phase PWM signals. The controller is configured or programmed to shift, when duty command values of at least two phases of the three-phase duty command values updated at a first update timing are the same, the duty command value of one phase of the duty command values of the two phases by a predetermined shift amount and shifts a duty command value of the one phase of the three-phase duty command values updated at a second update timing which is an update timing next to the first update timing by the shift amount in a direction opposite to a shift direction at the first update timing.Type: ApplicationFiled: June 23, 2022Publication date: December 29, 2022Inventors: Takashi KOIKEGAMI, Isao SANBONMATSU, Akihiro OKAMURA, Tomohiro FUKUMURA, Kotaro KATAOKA
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Patent number: 11251721Abstract: A power supply device is provided with an output unit, an input unit, a rectifier circuit, a switching circuit, and a controller. The input unit inputs an AC input. The rectifier circuit has a smoothing capacitor and converts the AC input into a rectified output. The switching circuit switches between an ON-state in which input impedance is low and an OFF-state in which input impedance is higher than that in the ON-state. The controller sets a modulation ratio such that, when controlling the switching circuit to switch between the ON-state and the OFF-state, at least a portion of a period, in which the modulation width of the modulation duty ratio becomes maximum, is included in a period from a time when an input current inputted to the smoothing capacitor is generated to a time when the voltage of the smoothing capacitor reaches a maximum value.Type: GrantFiled: July 25, 2018Date of Patent: February 15, 2022Assignee: NIDEC CORPORATIONInventors: Kotaro Kataoka, Hiroshi Iwata, Takamitsu Suzuki
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Patent number: 11192596Abstract: A vehicle body structure in a vehicle rear portion includes a second rear lateral ring-shaped vehicle body framework (RWC2) having a substantially ring shape in a vehicle lateral direction and located near a pair of left and right damper support portions (54) supporting suspension dampers (55) and disposed in rear wheelhouses (52) behind side door openings (Es) in the vehicle. The vehicle body structure includes coupling members (33) coupling a pair of left and right side pillars (42) constituting the second rear lateral ring-shaped vehicle body framework (RWC2) having the substantially ring shape to a pair of left and right wheelhouse reinforcements (53).Type: GrantFiled: March 1, 2019Date of Patent: December 7, 2021Assignee: MAZDA MOTOR CORPORATIONInventors: Kenichi Sato, Masanori Fukuda, Hiroshi Yamamoto, Kotaro Kataoka
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Patent number: 11128232Abstract: A driving device is provided with an output unit, an input unit, a rectifier circuit, a switching circuit and a controller. The input unit inputs an AC in put. The rectifier circuit has a smoothing capacitor and converts the AC input into a rectified output. The switching circuit switches between an ON-state in which input impedance is low and an OFF-state in which input impedance is higher than that in the ON-state. The controller sets a start timing such that, when controlling the switching circuit to switch between the ON-state and the OFF-state, at least a portion of a period, in which the start timing of a power supply period becomes a second timing, is included in a period from a time when an input current inputted to the smoothing capacitor is generated to a time when the voltage of the smoothing capacitor reaches a maximum value.Type: GrantFiled: July 25, 2018Date of Patent: September 21, 2021Assignee: NIDEC CORPORATIONInventors: Kotaro Kataoka, Hiroshi Iwata, Takamitsu Suzuki, Masaru Nomura
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Publication number: 20210086833Abstract: A vehicle body structure in a vehicle rear portion includes a second rear lateral ring-shaped vehicle body framework (RWC2) having a substantially ring shape in a vehicle lateral direction and located near a pair of left and right damper support portions (54) supporting suspension dampers (55) and disposed in rear wheelhouses (52) behind side door openings (Es) in the vehicle. The vehicle body structure includes coupling members (33) coupling a pair of left and right side pillars (42) constituting the second rear lateral ring-shaped vehicle body framework (RWC2) having the substantially ring shape to a pair of left and right wheelhouse reinforcements (53).Type: ApplicationFiled: March 1, 2019Publication date: March 25, 2021Applicant: MAZDA MOTOR CORPORATIONInventors: Kenichi SATO, Masanori FUKUDA, Hiroshi YAMAMOTO, Kotaro KATAOKA
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Publication number: 20200235677Abstract: A power supply device is provided with an output unit, an input unit, a rectifier circuit, a switching circuit, and a controller. The input unit inputs an AC input. The rectifier circuit has a smoothing capacitor and converts the AC input into a rectified output. The switching circuit switches between an ON-state in which input impedance is low and an OFF-state in which input impedance is higher than that in the ON-state. The controller sets a modulation ratio such that, when controlling the switching circuit to switch between the ON-state and the OFF-state, at least a portion of a period, in which the modulation width of the modulation duty ratio becomes maximum, is included in a period from a time when an input current inputted to the smoothing capacitor is generated to a time when the voltage of the smoothing capacitor reaches a maximum value.Type: ApplicationFiled: July 25, 2018Publication date: July 23, 2020Applicant: NIDEC CORPORATIONInventors: Kotaro KATAOKA, Hiroshi IWATA, Takamitsu SUZUKI
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Publication number: 20200212818Abstract: A driving device is provided with an output unit, an input unit, a rectifier circuit, a switching circuit and a controller. The input unit inputs an AC in put. The rectifier circuit has a smoothing capacitor and converts the AC input into a rectified output. The switching circuit switches between an ON-state in which input impedance is low and an OFF-state in which input impedance is higher than that in the ON-state. The controller sets a start timing such that, when controlling the switching circuit to switch between the ON-state and the OFF-state, at least a portion of a period, in which the start timing of a power supply period becomes a second timing, is included in a period from a time when an input current inputted to the smoothing capacitor is generated to a time when the voltage of the smoothing capacitor reaches a maximum value.Type: ApplicationFiled: July 25, 2018Publication date: July 2, 2020Applicant: NIDEC CORPORATIONInventors: Kotaro KATAOKA, Hiroshi IWATA, Takamitsu SUZUKI, Masaru NOMURA
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Patent number: 8660123Abstract: A transmitting side (101) transmits broadcast content (100) through a communication network (111) or a broadcast network (110). Transmission through the communication network (111) involves an addition of an IP header (100b) to the broadcast content (100) for packetization as an IP packet (100a) and transmission to a terminal device (112) on a receiving side (102). Transmission through the broadcast network (110) involves encapsulation of the IP packet into a given transmission packet (105) used with a digital broadcast signal for transmission to the terminal device on the receiving side (102).Type: GrantFiled: September 13, 2006Date of Patent: February 25, 2014Assignees: KDDI Corporation, Keio UniversityInventors: Jun Murai, Takaaki Ishida, Kotaro Kataoka, Hiroaki Kimura, Shingo Izawa
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Patent number: 8422498Abstract: An information communication apparatus (100A) that receives transmission information transmitted from a broadcast station, generates and relays response information to an information communication apparatus (100C) having access to a communication network (120) includes: a broadcast-wave I/F that receives the transmission information; a wireless I/F that transmits the response information to the information communication apparatus (100C) capable of wireless communication to relay the response information to an area having access to the communication network (120); a communication network I/F that is connected to the communication network (120) and transmits the response information; a response-transmission-information generating unit that generates the response information; and a connection control unit that determines whether the communication network (120) is accessible, transmits the response information to the communication network (120) when accessible, and relays the response information to the connectabType: GrantFiled: March 30, 2007Date of Patent: April 16, 2013Assignees: KDDI Corporation, Keio UniversityInventors: Hiroaki Kimura, Shingo Izawa, Takaaki Ishida, Kotaro Kataoka
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Patent number: 8130691Abstract: A relay apparatus (110) includes a communication I/F (113) that receives an IP packet from a source terminal (120A) via a communication network (101), a broadcast wave interface (114) that transmits the IP packet received via the communication network I/F (113) to a destination terminal (120B) by a digital broadcast wave, and a receiving and transmitting unit (111) that transmits the IP packet that is received by the communication I/F (113) and transmitted by the transmitting communication terminal (120A) to the destination terminal (120B) via the broadcast wave I/F (114).Type: GrantFiled: April 11, 2008Date of Patent: March 6, 2012Assignees: KDDI Corporation, Keio UniversityInventors: Hiroaki Kimura, Shingo Izawa, Takaaki Ishida, Kotaro Kataoka
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Patent number: 8077715Abstract: A content transmitting apparatus includes a content transmitting unit (111) that IP packetizes content to be transmitted through a communication network (101), and an encapsulating unit (112) that encapsulates the content IP packetized by the content transmitting unit (111) to generate a transmission packet to be transmitted through a broadcast network (102) for digital broadcast media. The content transmitting unit (111) and the encapsulating unit (112) transmit plural content items by IP multicast. The content transmitting unit (111) adds, to a header of the content to be IP packetized, information concerning a condition of a receiving side node of the content.Type: GrantFiled: September 28, 2006Date of Patent: December 13, 2011Assignees: KDDI Corporation, Keio UniversityInventors: Hiroaki Kimura, Shingo Izawa, Takaaki Ishida, Kotaro Kataoka
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Publication number: 20090274151Abstract: A transmitting side (101) transmits broadcast content (100) through a communication network (111) or a broadcast network (110). Transmission through the communication network (111) involves an addition of an IP header (100b) to the broadcast content (100) for packetization as an IP packet (100a) and transmission to a terminal device (112) on a receiving side (102). Transmission through the broadcast network (110) involves encapsulation of the IP packet into a given transmission packet (105) used with a digital broadcast signal for transmission to the terminal device on the receiving side (102).Type: ApplicationFiled: September 13, 2006Publication date: November 5, 2009Applicants: KDDI CORPORATION, KEIO UNIVERSITYInventors: Jun Murai, Takaaki Ishida, Kotaro Kataoka, Hiroaki Kimura, Shingo Izawa
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Publication number: 20090245161Abstract: An information communication apparatus (100A) that receives transmission information transmitted from a broadcast station, generates and relays response information to an information communication apparatus (100C) having access to a communication network (120) includes: a broadcast-wave I/F that receives the transmission information; a wireless I/F that transmits the response information to the information communication apparatus (100C) capable of wireless communication to relay the response information to an area having access to the communication network (120); a communication network I/F that is connected to the communication network (120) and transmits the response information; a response-transmission-information generating unit that generates the response information; and a connection control unit that determines whether the communication network (120) is accessible, transmits the response information to the communication network (120) when accessible, and relays the response information to the connectabType: ApplicationFiled: March 30, 2007Publication date: October 1, 2009Applicants: KDDI CORPORATION, KEIO UNIVERSITYInventors: Hiroaki Kimura, Shingo Izawa, Takaaki Ishida, Kotaro Kataoka
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Publication number: 20090245250Abstract: A content transmitting apparatus includes a content transmitting unit (111) that IP packetizes content to be transmitted through a communication network (101), and an encapsulating unit (112) that encapsulates the content IP packetized by the content transmitting unit (111) to generate a transmission packet to be transmitted through a broadcast network (102) for digital broadcast media. The content transmitting unit (111) and the encapsulating unit (112) transmit plural content items by IP multicast. The content transmitting unit (111) adds, to a header of the content to be IP packetized, information concerning a condition of a receiving side node of the content.Type: ApplicationFiled: September 28, 2006Publication date: October 1, 2009Applicants: KDDI CORPORATION, KEIO UNIVERSITYInventors: Hiroaki Kimura, Shingo Izawa, Takaaki Ishida, Kotaro Kataoka
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Publication number: 20090073158Abstract: A memory element having a large memory window and a high reliability is provided at low cost by performing high speed write and erase operations at a relatively low voltage and suppressing rewrite degradation. A memory element includes a semiconductor layer arranged on an insulating substrate, a first diffusion layer region and a second diffusion layer region having a conductivity type of P-type, a charge accumulating film for covering a channel region between the first diffusion layer region and the second diffusion layer region and being injected with charges from the channel region, and a gate electrode positioned on a side opposite to the channel region with the charge accumulating film in between.Type: ApplicationFiled: September 17, 2008Publication date: March 19, 2009Applicant: SHARP KABUSHIKI KAISHAInventors: Kotaro Kataoka, Hiroshi Iwata, Yoshiji Ohta, Kenji Kimoto, Kenji Komiya, Kouichiro Adachi, Akihide Shibata, Masatomi Harada
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Publication number: 20090046621Abstract: A relay apparatus (110) includes a communication I/F (113) that receives an IP packet from a source terminal (120A) via a communication network (101), a broadcast wave interface (114) that transmits the IP packet received via the communication network I/F (113) to a destination terminal (120B) by a digital broadcast wave, and a receiving and transmitting unit (111) that transmits the IP packet that is received by the communication I/F (113) and transmitted by the transmitting communication terminal (120A) to the destination terminal (120B) via the broadcast wave I/F (114).Type: ApplicationFiled: April 11, 2008Publication date: February 19, 2009Applicants: KDDI CORPORATION, KEIO UNIVERSITYInventors: Hiroaki KIMURA, Shingo IZAWA, Takaaki ISHIDA, Kotaro KATAOKA