Patents by Inventor Yuji Takayama
Yuji Takayama 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: 20200358378Abstract: A motor drive device includes a single-phase inverter converting a direct-current voltage output from a power supply that is a direct-current power supply into an alternating-current voltage having a high level, low level, or zero level potential. The inverter outputs the alternating-current voltage as a motor applied voltage to be applied to a motor. The alternating-current voltage is a voltage that has a high level, low level, or zero level potential. When a rotation speed of the motor is to be reduced, a section in which a potential of the motor applied voltage is zero level is widened.Type: ApplicationFiled: March 23, 2018Publication date: November 12, 2020Inventors: Yuji TAKAYAMA, Haruka MATSUO, Kazunori HATAKEYAMA
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Patent number: 10736476Abstract: A reliable electric vacuum cleaner is provided. An electric vacuum cleaner includes a housing, an electric blower, a battery, and a controller. The housing includes a first chamber, a second chamber, and a handle. The battery is held in the second chamber and supplies electric power for driving the electric blower. The controller controls the electric blower. A first distance from the handle to the battery is shorter than a second distance from the handle to the electric blower.Type: GrantFiled: July 15, 2016Date of Patent: August 11, 2020Assignee: Mitsubishi Electric CorporationInventors: Yuji Takayama, Takashi Yamakawa, Yosuke Shinomoto
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Patent number: 10658964Abstract: A motor driving apparatus drives an electric blower including a single-phase PM motor. The motor driving apparatus includes: a single-phase inverter that applies an alternating-current voltage to the single-phase PM motor; a rotor position detecting unit that outputs, to an inverter control unit, a position detecting signal corresponding to a rotational position of a rotor of the single-phase PM motor; a motor current detecting unit that outputs, to the inverter control unit, a signal corresponding to a motor current flowing to the single-phase PM motor; and the inverter control unit that outputs a driving signal to corresponding switching elements of the single-phase inverter on the basis of the position detecting signal and the motor current. The single-phase inverter performs control to increase or decrease effective electric power supplied to the single-phase PM motor. The air blower changes an air volume by the increase or decrease in effective electric power.Type: GrantFiled: November 2, 2015Date of Patent: May 19, 2020Assignee: Mitsubishi Electric CorporationInventors: Keisuke Uemura, Yuji Takayama, Yosuke Shinomoto
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Publication number: 20200039254Abstract: By controlling drive of a first drive motor that drives a feed roller feeding a printing medium and a second drive motor that drives a conveyance roller conveying the printing medium fed by the feed roller, a preceding printing medium and a following printing medium are conveyed continuously. Raised-temperature detection processing to detect a raised-temperature state of the first drive motor and the second drive motor is performed based on a predetermined condition. In a case where one drive motor of the first drive motor and the second drive motor does not satisfy the predetermined condition and the other driver motor satisfies the predetermined condition, the raised-temperature detection processing of the one drive motor that does not satisfy the predetermined condition is caused to be performed after suspending the continuous conveyance.Type: ApplicationFiled: July 22, 2019Publication date: February 6, 2020Inventor: Yuji Takayama
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Publication number: 20200039702Abstract: To provide a hinged cap is capable of preventing liquid content from squirting out and minimizing adhesion of the content on the top face of the cap or around an outer circumferential abutment part, with a simple structure. A hinged cap (100) includes a cap body (110) and an upper lid (130) connected by a hinge (150), with a tubular spout wall (112) provided on an upper surface side of the cap body (110), and a circular suspended part (132) provided on an upper lid top face (131). The circular suspended part (132) has an outer circumferential abutment part (133) that makes contact with an inner circumferential surface of the tubular spout wall (112). The hinged cap includes a liquid build-up prevention part (134) at least in a lower part of the circular suspended part (132) opposite to a part connected to the hinge.Type: ApplicationFiled: October 9, 2019Publication date: February 6, 2020Applicant: Nippon Closures Co., Ltd.Inventors: Toru Sahara, Yuji Takayama
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Publication number: 20190393738Abstract: An electric motor includes a stator including four split cores, and a rotor having four magnetic poles. Each of the split cores includes a yoke and a tooth. An angle ?1 [degree] formed by a side surface of the tooth and a side surface of the yoke on an inner side in a radial direction of the stator satisfies 90 degrees??1<180 degrees.Type: ApplicationFiled: February 24, 2017Publication date: December 26, 2019Inventors: Kazuchika TSUCHIDA, Yuji TAKAYAMA, Keisuke UEMURA
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Publication number: 20190167051Abstract: A reliable electric vacuum cleaner is provided. An electric vacuum cleaner includes a housing, an electric blower, a battery, and a controller. The housing includes a first chamber, a second chamber, and a handle. The battery is held in the second chamber and supplies electric power for driving the electric blower. The controller controls the electric blower. A first distance from the handle to the battery is shorter than a second distance from the handle to the electric blower.Type: ApplicationFiled: July 15, 2016Publication date: June 6, 2019Inventors: Yuji TAKAYAMA, Takashi YAMAKAWA, Yosuke SHINOMOTO
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Patent number: 10211765Abstract: A motor control device includes a position sensor that detects a position of a motor, an AD converter that converts an analog signal, which is a detection value of a motor current, into a digital signal, and a control circuit that drives an inverter using an output signal of the AD converter. The control circuit starts the AD converter during a permission period, and performs processing for the analog-digital converter during an electrical half cycle including a permission period. The length of a prohibition period obtained by excluding a permission period from an electrical half cycle decreases as the rotating speed of the motor increases.Type: GrantFiled: October 30, 2015Date of Patent: February 19, 2019Assignee: Mitsubishi Electric CorporationInventors: Koichi Arisawa, Keisuke Uemura, Yuji Takayama, Yosuke Shinomoto
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Patent number: 10177703Abstract: A leak-current detecting unit detects a zero-phase current flowing from an electric-motor driving device, which drives an electric motor with electric power from an alternating-current power supply, or the electric motor to a ground, a leak-current control unit that, on the basis of the zero-phase current detected by the leak-current detecting unit, generates a control signal having cyclicity synchronized with the alternating-current power supply, and an anti-phase generating unit that generates an anti-phase current that is in anti-phase to the zero-phase current on the basis of the control signal from the leak-current control unit, and outputs the anti-phase current.Type: GrantFiled: September 17, 2014Date of Patent: January 8, 2019Assignee: Mitsubishi Electric CorporationInventors: Yosuke Shinomoto, Koichi Arisawa, Takashi Yamakawa, Yuji Takayama
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Publication number: 20180351483Abstract: A motor control device includes a position sensor that detects a position of a motor, an AD converter that converts an analog signal, which is a detection value of a motor current, into a digital signal, and a control circuit that drives an inverter using an output signal of the AD converter. The control circuit starts the AD converter during a permission period, and performs processing for the analog-digital converter during an electrical half cycle including a permission period. The length of a prohibition period obtained by excluding a permission period from an electrical half cycle decreases as the rotating speed of the motor increases.Type: ApplicationFiled: October 30, 2015Publication date: December 6, 2018Inventors: Koichi ARISAWA, Keisuke UEMURA, Yuji TAKAYAMA, Yosuke SHINOMOTO
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Publication number: 20180316297Abstract: A motor driving apparatus according to the present invention is a motor driving apparatus that drives an electric blower including a single-phase PM motor. The motor driving apparatus includes: a single-phase inverter that applies an alternating-current voltage to the single-phase PM motor; a rotor position detecting unit 7 that outputs, to an inverter control unit, a position detecting signal which is a signal corresponding to a rotational position of a rotor of the single-phase PM motor; a motor current detecting unit that outputs, to the inverter control unit, a signal corresponding to a motor current flowing to the single-phase PM motor; and the inverter control unit that outputs a driving signal to corresponding one of switching elements of the single-phase inverter on the basis of the position detecting signal and the motor current.Type: ApplicationFiled: November 2, 2015Publication date: November 1, 2018Inventors: Keisuke UEMURA, Yuji TAKAYAMA, Yosuke SHINOMOTO
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Patent number: 9991817Abstract: A power converting device includes: a rectifying circuit connected to an alternating-current power supply for converting alternating-current power from the alternating-current power supply into direct-current power; a short-circuit unit constituted by a diode bridge and a short-circuit element connected to opposite output ends of the diode bridge for short-circuiting the alternating-current power supply via a reactor; and a control unit that generates plural drive signals to control the short-circuit unit during a half cycle of the alternating-current power supply. The control unit generates a sine-wave-shaped current control range that is a target control range of power supply current of the alternating-current power supply, and maintains values of the power supply current of the alternating-current power supply within the current control range.Type: GrantFiled: August 5, 2014Date of Patent: June 5, 2018Assignee: Mitsubishi Electric CorporationInventors: Takuya Shimomugi, Koichi Arisawa, Takashi Yamakawa, Yuji Takayama
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Patent number: 9941780Abstract: A power converting apparatus includes a rectifier converting alternating-current power from an alternating-current power supply into direct-current power; a short-circuit unit short-circuiting the alternating-current power supply via a reactor; and a controlling unit controlling the short-circuit unit in a half cycle of the alternating-current power supply. A correction amount using inductance of the reactor is set in the controlling unit, and the controlling unit changes, using at least a detection value of a power supply current and the correction amount, an ON time and an OFF time of a plurality of switching pulses, and controls, using changed switching pulses, an ON/OFF operation of the short-circuit unit.Type: GrantFiled: September 30, 2014Date of Patent: April 10, 2018Assignee: Mitsubishi Electric CorporationInventors: Yuji Takayama, Takashi Yamakawa, Koichi Arisawa, Shigeo Umehara, Tomomi Higashikawa, Makoto Tanikawa
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Patent number: 9941810Abstract: A power conversion device includes a rectifier circuit that converts an AC power from an AC power supply, into a DC power, a short-circuit unit that short-circuits the AC power supply via a reactor connected between the AC power supply and the rectifier circuit, a control unit that generates a plurality of drive signals to control the short-circuit unit in a half cycle of the AC power supply, and a smoothing capacitor. The control unit stepwise varies threshold values that limit a value of a power-supply current of the AC power supply, in an on-section or an off-section of the plurality of drive signals.Type: GrantFiled: July 8, 2014Date of Patent: April 10, 2018Assignee: Mitsubishi Electric CorporationInventors: Koichi Arisawa, Takashi Yamakawa, Yuji Takayama, Takuya Shimomugi, Yosuke Shinomoto
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Patent number: 9929637Abstract: The device includes a rectifier circuit that converts alternating-current power from an alternating-current power supply into direct-current power; a short-circuit unit that short-circuits the alternating-current power supply via a reactor connected between the alternating-current power supply and the rectifier circuit; and a control unit that controls an ON/OFF operation of the short-circuit unit during a half cycle of the alternating-current power supply. The control unit includes a driving-signal generating unit that generates a driving signal Sa that is a switching pulse to control the ON/OFF operation of the short-circuit unit; and a pulse dividing unit that divides the driving signal Sa into a plurality of switching pulses.Type: GrantFiled: September 26, 2014Date of Patent: March 27, 2018Assignee: Mitsubishi Electric CorporationInventors: Koichi Arisawa, Takashi Yamakawa, Yuji Takayama, Shigeo Umehara, Tomomi Higashikawa, Makoto Tanikawa
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Patent number: 9866140Abstract: A power converting apparatus includes a rectifier that converts alternating-current power from an alternating-current power supply into direct-current power, a short-circuit unit that short-circuits the alternating-current power supply via a reactor, and a control unit that controls a short-circuit operation of the short-circuit unit. The control unit changes the number of times of the short-circuit operation during a half cycle of the alternating-current power supply on the basis of a load condition and sets a period from a start to an end of the short-circuit operation during the half cycle of the alternating-current power supply after the change of the number of times of the short-circuit operation to be different from a period from a start to an end of the short-circuit operation during the half cycle of the alternating-current power supply before the change of the number of times of the short-circuit operation.Type: GrantFiled: September 30, 2014Date of Patent: January 9, 2018Assignee: Mitsubishi Electric CorporationInventors: Takashi Yamakawa, Koichi Arisawa, Yuji Takayama, Shigeo Umehara, Tomomi Higashikawa, Makoto Tanikawa
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Publication number: 20170302217Abstract: A leak-current detecting unit detects a zero-phase current flowing from an electric-motor driving device, which drives an electric motor with electric power from an alternating-current power supply, or the electric motor to a ground, a leak-current control unit that, on the basis of the zero-phase current detected by the leak-current detecting unit, generates a control signal having cyclicity synchronized with the alternating-current power supply, and an anti-phase generating unit that generates an anti-phase current that is in anti-phase to the zero-phase current on the basis of the control signal from the leak-current control unit, and outputs the anti-phase current.Type: ApplicationFiled: September 17, 2014Publication date: October 19, 2017Inventors: Yosuke SHINOMOTO, Koichi ARISAWA, Takashi YAMAKAWA, Yuji TAKAYAMA
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Publication number: 20170302150Abstract: A power converting apparatus includes a rectifier converting alternating-current power from an alternating-current power supply into direct-current power; a short-circuit unit short-circuiting the alternating-current power supply via a reactor; and a controlling unit controlling the short-circuit unit in a half cycle of the alternating-current power supply. A correction amount using inductance of the reactor is set in the controlling unit, and the controlling unit changes, using at least a detection value of a power supply current and the correction amount, an ON time and an OFF time of a plurality of switching pulses, and controls, using changed switching pulses, an ON/OFF operation of the short-circuit unit.Type: ApplicationFiled: September 30, 2014Publication date: October 19, 2017Applicant: Mitsubishi Electric CorporationInventors: Yuji TAKAYAMA, Takashi YAMAKAWA, Koichi ARISAWA, Shigeo UMEHARA, Tomomi HIGASHIKAWA, Makoto TANIKAWA
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Publication number: 20170288527Abstract: The device includes a rectifier circuit that converts alternating-current power from an alternating-current power supply into direct-current power; a short-circuit unit that short-circuits the alternating-current power supply via a reactor connected between the alternating-current power supply and the rectifier circuit; and a control unit that controls an ON/OFF operation of the short-circuit unit during a half cycle of the alternating-current power supply. The control unit includes a driving-signal generating unit that generates a driving signal Sa that is a switching pulse to control the ON/OFF operation of the short-circuit unit; and a pulse dividing unit that divides the driving signal Sa into a plurality of switching pulses.Type: ApplicationFiled: September 26, 2014Publication date: October 5, 2017Inventors: Koichi ARISAWA, Takashi YAMAKAWA, Yuji TAKAYAMA, Shigeo UMEHARA, Tomomi HIGASHIKAWA, Makoto TANIKAWA
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Publication number: 20170222572Abstract: A power converting apparatus includes a rectifier that converts alternating-current power from an alternating-current power supply into direct-current power, a short-circuit unit that short-circuits the alternating-current power supply via a reactor, and a control unit that controls a short-circuit operation of the short-circuit unit. The control unit changes the number of times of the short-circuit operation during a half cycle of the alternating-current power supply on the basis of a load condition and sets a period from a start to an end of the short-circuit operation during the half cycle of the alternating-current power supply after the change of the number of times of the short-circuit operation to be different from a period from a start to an end of the short-circuit operation during the half cycle of the alternating-current power supply before the change of the number of times of the short-circuit operation.Type: ApplicationFiled: September 30, 2014Publication date: August 3, 2017Inventors: Takashi YAMAKAWA, Koichi ARISAWA, Yuji TAKAYAMA, Shigeo UMEHARA, Tomomi HIGASHIKAWA, Makoto TANIKAWA