Patents by Inventor Akihiko Kuroiwa
Akihiko Kuroiwa 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: 20240120842Abstract: A drive equipment includes a transformer, a power converter, and a control system. The transformer is configured with a primary winding and a secondary winding, and a winding of an electric motor is connected to the secondary winding. The power converter causes a current to flow through the primary winding of the transformer. The control system performs constant current control on the power converter during a period of a first stage after startup of the electric motor is instructed, to reduce a variation in a current flowing through the primary winding of the transformer, and controls the power converter through variable voltage variable frequency control of the electric motor in a second stage after the first stage.Type: ApplicationFiled: June 10, 2021Publication date: April 11, 2024Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Mostafa MAMUN, Akihiko KUROIWA
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Patent number: 7403404Abstract: In a power inverter system, an inverter unit includes first to third single-phase inverters. In the power inverter system, a reference-frequency calculating unit calculates a reference frequency of each of the first to third single-phase inverters. A reference-voltage-calculating unit calculates a reference voltage of each of the single-phase inverters. In the power inverter system, a voltage-correcting unit adds a correction voltage to the reference voltage calculated by the reference voltage-calculating unit. The correction voltage has a frequency three times as high as the reference frequency.Type: GrantFiled: November 29, 2005Date of Patent: July 22, 2008Assignee: Toshiba Mitsubishi-Electric Industrial Systems CorporationInventors: Toshiaki Oka, Akihiko Kuroiwa
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Publication number: 20060215429Abstract: In a power inverter system, an inverter unit includes first to third single-phase inverters. In the power inverter system, a reference-frequency calculating unit calculates a reference frequency of each of the first to third single-phase inverters. A reference-voltage-calculating unit calculates a reference voltage of each of the single-phase inverters. In the power inverter system, a voltage-correcting unit adds a correction voltage to the reference voltage calculated by the reference voltage-calculating unit. The correction voltage has a frequency three times as high as the reference frequency.Type: ApplicationFiled: November 29, 2005Publication date: September 28, 2006Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUS. SYS. CORP.Inventors: Toshiaki Oka, Akihiko Kuroiwa
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Patent number: 7091690Abstract: A power conversion device is constituted by: a power converter that receives AC power and uses this to drive an AC motor; a control section for controlling an inverter section of the power converter; a voltage detection section that detects the voltage of the AC power source; a current detection section that detects the input current of the AC motor; and a speed detection section that detects the rotational speed of the AC motor.Type: GrantFiled: September 30, 2005Date of Patent: August 15, 2006Assignee: Toshiba Mitsubishi-Electric Industrial Systems CorporationInventors: Toshiaki Oka, Akihiko Kuroiwa
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Publication number: 20060097689Abstract: A controller for a wound-rotor induction motor includes a first voltage-type converter connected to a secondary winding of the motor, a capacitor for smoothing DC output thereof, a second voltage-type converter to supply an AC power supply with regenerated secondary power, a speed detector of the motor, a secondary current detector of the motor, a DC voltage detector applied to the capacitor, a speed controller for controlling the speed by the speed detector and outputting a secondary referential current, a first PWM controller to control the secondary current in response to the referential current, and to output a voltage signal by witch switching elements of the first voltage-type converter are controlled by PWM, and a second PWM controller to control a voltage output from the voltage detector in response to a referential voltage, and to control by PWM switching elements of the second voltage-type converter.Type: ApplicationFiled: September 28, 2005Publication date: May 11, 2006Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUS. SYS. CORP.Inventors: Akihiko Kuroiwa, Kazuyuki Deguchi
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Patent number: 7042194Abstract: A controller for a wound-rotor induction motor includes a first voltage-type converter connected to a secondary winding of the motor, a capacitor for smoothing DC output thereof, a second voltage-type converter to supply an AC power supply with regenerated secondary power, a speed detector of the motor, a secondary current detector of the motor, a DC voltage detector applied to the capacitor, a speed controller for controlling the speed by the speed detector and outputting a secondary referential current, a first PWM controller to control the secondary current in response to the referential current, and to output a voltage signal by witch switching elements of the first voltage-type converter are controlled by PWM, and a second PWM controller to control a voltage output from the voltage detector in response to a referential voltage, and to control by PWM switching elements of the second voltage-type converter.Type: GrantFiled: September 28, 2005Date of Patent: May 9, 2006Assignee: Toshiba Mitsubishi-Electric Indus. Sys. Corp.Inventors: Akihiko Kuroiwa, Kazuyuki Deguchi
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Patent number: 6431598Abstract: A gas generator for air bags for use in an air bag system for safely protecting a driver and riders in a vehicle from shock from collisions at low cost, while preventing slag in a gas flowing outside.Type: GrantFiled: June 15, 2001Date of Patent: August 13, 2002Assignees: Nippon Kayaku Kabushiki-Kaisha, Kabushiki Kaisha Kobe Seiko ShoInventors: Takashi Saso, Koji Tanaka, Akihiko Kuroiwa, Norihisa Miyamoto
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Patent number: 6416599Abstract: The present invention provides a gas generating agent for an air bag including a fuel component of nitrogenous organic compound and an oxidizing agent as its major components, to which at least one metal nitride or metal carbide that is allowed to react with a metallic component contained in the fuel component or the oxidizing agent to form slag is added, thus providing the effects of: solving the slag collecting problem which stands in the way of commercially practicing the nitrogenous organic compound base fuels; promoting the size reduction of the gas generator through the full use of high rate of gasification of the nitrogenous organic compound base fuels; and providing a gas generating agent molded member which is strong and stable with age by improving heat resistant properties and formability of the nitrogenous organic compound base fuels which are poor compared with the metallic compound azide of an inorganic matter.Type: GrantFiled: June 28, 1999Date of Patent: July 9, 2002Assignees: Nippon Kayaku Kabushiki-Kaisha, Kabushiki Kaisha Kobe Seiko ShoInventors: Eiichiro Yoshikawa, Ryo Minoguchi, Akihiko Kuroiwa, Takeshi Kanda, Kenjiro Ikeda, Makoto Iwasaki, Akihiko Tanaka, Eishi Sato, Dairi Kubo, Kaoru Masuda, Moriyoshi Kanamaru
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Publication number: 20010028164Abstract: A gas generator for air bags for use in an air bag system for safely protecting a driver and riders in a vehicle from shock from collisions. The gas generator has the following features to enable a component count to be reduced, thereby manufacturing the gas generator at low cost, while preventing slag in a gas flowing outside.Type: ApplicationFiled: June 15, 2001Publication date: October 11, 2001Applicant: Nippon Kayaku Kabushiki-KaishaInventors: Takashi Saso, Koji Tanaka, Akihiko Kuroiwa, Norihisa Miyamoto
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Patent number: 6283505Abstract: A gas generator for air bags for use in an air bag system for safely protecting a driver and riders in a vehicle from shock from collisions. The system includes a housing (3) formed by a side cylinder (1b) with a plurality of gas exhaust openings (8) the housing being closed at its ends by an upper cap (1a) and a lower cap (2a); an igniting device (16), provided in the housing (3) at a center portion thereof; gas generating agents (6), provided in the housing (3) at a location radially outside of the igniting device (16), to be burnt to generate gas; a cooling/filtering member (7) provided in the housing (3) at a location radially outside of the gas generating agents (6) to enclose the gas generating agents and extending from the side of the upper cap (1a) to the side of the lower cap (2a); and an annular projection (50) for preventing the gas generated by the burning of the gas generating agents (6) from flowing toward an end portion of the cooling/filtering member (7).Type: GrantFiled: May 12, 1999Date of Patent: September 4, 2001Assignees: Nippon Kayaku Kabushiki-Kaisha, Kabushiki Kaisha Kobe Seiko ShoInventors: Takashi Saso, Koji Tanaka, Akihiko Kuroiwa, Norihisa Miyamoto
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Patent number: 6194121Abstract: An optical recording medium has deposited on a substrate a recording layer incorporating therein a cyanine dye, preferably an indoline dye, and optionally incorporating therein an autoxidizable compound or a thermoplastic resin and/or a singlet oxygen quencher.Type: GrantFiled: January 21, 1998Date of Patent: February 27, 2001Assignee: TDK Corp.Inventors: Kenryo Namba, Akihiko Kuroiwa, Shiro Nakagawa
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Patent number: 6177028Abstract: A spontaneous firing explosive composition for use in a gas generator for an airbag containing a fuel, an oxidizer, a combustion modifier, and a binder.Type: GrantFiled: June 1, 1998Date of Patent: January 23, 2001Assignees: Nippon Kayaku Kabushiki-Kaisha, Kabushiki Kaisha Kobe Seiko ShoInventors: Takeshi Kanda, Nobuaki Yokote, Takashi Saso, Koji Tanaka, Akihiko Kuroiwa, Yuji Ito, Ayumu Kimura
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Patent number: 6033500Abstract: The present invention is directed to an airbag explosive composition comprising a fuel ingredient, an oxidizing agent and a binder for binding them, said binder being hydrotalcite group expressed by the following general formula (1), and a producing method therefor:[M.sup.2+.sub.1-x M.sup.3+.sub.x (OH).sub.2 ].sup.x+ [A.sup.n-.sub.x/n. mH.sub.2 O].sup.x- (1)whereM.sup.2+ represents a bivalent metal such as Mg.sup.2+, Mn.sup.2+, Fe.sup.2+, Co.sup.2+, Ni.sup.2+, Cu.sup.2+ and Zn.sup.2+ ;M.sup.3+ represents a trivalent metal such as Al.sup.3+, Fe.sup.3+, Cr.sup.3+, Co.sup.3+ and In.sup.3+ ;A.sup.n- represents an n-valence anion such as OH.sup.-, F.sup.-, Cl.sup.-, NO.sub.3.sup.-, C0.sub.3.sup.2-, SO.sub.4.sup.2-, Fe(CN).sub.6.sup.3-, CH.sub.3 COO.sup.-, oxalate ion and salicylate ion; and0<x.ltoreq.0.33.Type: GrantFiled: January 27, 1998Date of Patent: March 7, 2000Assignees: Sensor Technology Co., Ltd., Nippon Kayaku Kabushiki-KaishaInventors: Yuji Ito, Eishi Sato, Akihiko Tanaka, Makoto Iwasaki, Kenjiro Ikeda, Eri Oishi, Ryo Minoguchi, Eiichiro Yoshikawa, Akihiko Kuroiwa
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Patent number: 5741623Abstract: An optical recording medium has deposited on a substrate a recording layer incorporating therein a cyanine dye, preferably an indoline dye, and optionally incorporating therein an autoxidizable compound or a thermoplastic resin and/or a singlet oxygen quencher.Type: GrantFiled: December 9, 1992Date of Patent: April 21, 1998Assignee: TDK CorporationInventors: Kenryo Namba, Akihiko Kuroiwa, Shiro Nakagawa
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Patent number: 5670295Abstract: An optical recording medium has deposited on a substrate a recording layer incorporating therein a cyanine dye, preferably an indoline dye, and optionally incorporating therein an autoxidizable compound or a thermoplastic resin andr a singlet oxygen quencher.Type: GrantFiled: December 9, 1992Date of Patent: September 23, 1997Inventors: Kenryo Namba, Akihiko Kuroiwa, Shiro Nakagawa
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Patent number: 5668528Abstract: An apparatus for actuating a plurality of safety devices equipped in a vehicle for protecting occupants from an impact of a collision has a plurality of squibs (4,5) connected in series with each other so as to form a series circuit (6) and ignited by a current flowing through and conformed to one and the same standard. A power source (3) supplies electrical energy to the series circuit (6), and a collision detector (7) allows a current to flow from the power source (3) to said series circuit (6) when detecting a collision. A required energy for igniting all of the squibs (4,5) is thus supplied before the series circuit (6) opens electrically at one squib.Type: GrantFiled: December 28, 1995Date of Patent: September 16, 1997Assignees: Sensor Technology Co. Ltd., Nippon Kayaku Kabushiki-KaishaInventors: Shigetaka Kitao, Ayumu Kimura, Yasuhiko Ootani, Isamu Hitomi, Akihiko Kuroiwa
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Patent number: 5512416Abstract: An optical recording medium has deposited on a substrate a recording layer incorporating therein a cyanine dye, preferably an indoline dye, and optionally incorporating therein an autoxidizable compound or a thermoplastic resin and/or a singlet oxygen quencher.Type: GrantFiled: June 6, 1995Date of Patent: April 30, 1996Assignee: TDK CorporationInventors: Kenryo Namba, Akihiko Kuroiwa, Shiro Nakagawa
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Patent number: 5326945Abstract: To detect an impact due to a shock with high precision and stability, a shock sensor is employed which provides a sufficiently long closure interval of a contact of a reed switch (1) enough to carry out signal processing. A gap between an outer surface of a magnet (2) and an inner wall (8) of a housing (7) defining a passage for the magnet (2) comprises a first gap (G1) between a stationary position and an activating position and a second gap (G2) between the activating position and a stop position. The inner wall (8) is formed so that the first gap (G1) is greater than the second gap (G2). The velocity of the magnet (2) is lower when travelling in the second gap (G2) than the velocity in the first gap (G1) because air resistance is greater in the second gap (G2). Accordingly, the closure interval is increased.Type: GrantFiled: December 2, 1992Date of Patent: July 5, 1994Assignees: Tokin Corporation, Sensor Technology Co. Ltd.Inventors: Noriyuki Gotoh, Yasunori Ohtuki, Naoharu Yamamoto, Hiroyuki Sada, Akihiko Kuroiwa, Hiroshi Moriyama
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Patent number: 5323305Abstract: A series coupled component partially includes a) a load circuit including an inductor and an EL or EL array having capacitive load characteristic, b) a load circuit including an inductor, a bipolar capacitor, and a diode circuit adapted to supply bidirectional current flows across an LED or LD, or c) a load circuit including an inductor, an EL or EL array having capacitive load characteristic, and the diode circuit. An inverter has coupling output terminals coupled to one end or both ends of the load circuit whereby an AC power inverted from a DC power source is supplied to the load circuit to operate at least one member of the EL, EL array, LED and LD. The inverter has a pair of positive and negative switches each comprising a zero-crossing switch mechanism adapted to automatically close its channel when the current becomes zero, the pair of positive and negative switches each being provided with a bypass channel having a reverse current bypass diode for bypassing the zero-crossing switch mechanism.Type: GrantFiled: October 7, 1991Date of Patent: June 21, 1994Assignees: Daichi Co., Ltd., Nihon Beam Electronics Co., Ltd., Takaaki IkedaInventors: Takaaki Ikeda, Toshihiko Suga, Akihiko Kuroiwa
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Patent number: 5245531Abstract: A multiplexed digital control device includes a plurality of control circuits and a main signal selection circuit for selecting and outputting a specific signal among the outputted manipulated variables of the plurality of the control circuits according to a predetermined logic. Each control circuit has sub-signal selection means for comparing an internal data of the control circuit obtained as a result of control operation thereof for an identical input signal of the device with internal data of other control circuits obtained as a result of control operations thereof and selecting a specific data among them, according to a predetermined logic. The specific data selected by the sub-signal selection means is outputted as a manipulated variable of its own control system.Type: GrantFiled: December 8, 1992Date of Patent: September 14, 1993Assignee: Kabushiki Kaisha ToshibaInventor: Akihiko Kuroiwa