Patents by Inventor Masanori Nakagawa

Masanori Nakagawa 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).

  • Publication number: 20060279087
    Abstract: An inverter controlled generator set including: a power supply unit that uses a generator driven by an engine as a power supply to output a DC voltage; an inverter device that converts the output voltage of the power supply unit into an AC voltage; and a rotational speed control unit that controls a rotational speed of the engine so as to be kept at a target rotational speed suitable for a load applied to the inverter device, wherein the rotational speed control unit is comprised so that a settling time when the rotational speed of the engine is caused to converge to the target rotational speed in a state where the load is above a set value is longer than a settling time when the rotational speed is caused to converge to the target rotational speed in a state where the load is below the set value, in order to minimize an operation sound of the engine when the load is intermittently driven.
    Type: Application
    Filed: August 22, 2006
    Publication date: December 14, 2006
    Applicant: Kokusan Denki Co., Tld.
    Inventors: Masahiko Endou, Masanori Nakagawa, Kaoru Shinba, Katsumi Yamamoto, Yoshihiro Sugisawa
  • Patent number: 7123495
    Abstract: An inverter controlled generator set including: a power supply unit that uses a generator driven by an engine as a power supply to output a DC voltage; an inverter device that converts the output voltage of the power supply unit into an AC voltage; and a rotational speed control unit that controls a rotational speed of the engine so as to be kept at a target rotational speed suitable for a load applied to the inverter device, wherein the rotational speed control unit is comprised so that a settling time when the rotational speed of the engine is caused to converge to the target rotational speed in a state where the load is above a set value is longer than a settling time when the rotational speed is caused to converge to the target rotational speed in a state where the load is below the set value, in order to minimize an operation sound of the engine when the load is intermittently driven.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: October 17, 2006
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Masahiko Endou, Masanori Nakagawa, Kaoru Shinba, Katsumi Yamamoto, Yoshihiro Sugisawa
  • Patent number: 7091812
    Abstract: An inverter unit comprising component parts including at least an inverter and a filter which removes a high harmonic wave component from an output of said inverter, wherein said component parts are housed in an aluminum case having a bottom wall portion and a side wall portion, said filter includes a coil which is wound around a core extending straight and is arranged at a position closed to one end of said case, an end portion of said core being wound with said coil is arranged closed to an inner surface of said side wall portion of the case, and a ferromagnetic plate, which leads magnetic flux coming in and out said end portion of the core arranged closed to said wall portion of the case to the direction along the inner surface of the side wall portion of the case, is disposed between said end portion of said core and said inner surface of said side wall portion of the case.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: August 15, 2006
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Yoshihiro Sugisawa, Masahiko Endou, Masanori Nakagawa, Katsumi Yamamoto, Kaoru Shinba
  • Patent number: 7081738
    Abstract: A generating device that includes an AC/DC conversion unit having a rectifier circuit that rectifies an output of a magneto rotor and applies the output to a battery, and an inverter circuit that converts a voltage of the battery into an AC control voltage and applies the AC control voltage to an armature coil of the magneto generator, performs chopper control that controls switch elements of the inverter circuit so as to interrupt an output current of the magneto generator to control the output of the magneto generator when a rotational speed of the magneto generator is lower than a set speed, and performs drive control that applies the AC control voltage from the battery through the inverter circuit to the armature coil when the rotational speed becomes higher than the set speed, and changes a phase angle of the AC control voltage to control the output of the magneto generator.
    Type: Grant
    Filed: October 26, 2004
    Date of Patent: July 25, 2006
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Shuichi Muramatsu, Hideaki Suzuki, Masanori Nakagawa, Masakatsu Takahashi
  • Publication number: 20050242783
    Abstract: An inverter controlled generator set including: an AC generator driven by a prime mover; a converter which converts an output of the AC generator into a DC output; an inverter which converts an output of the converter into an AC output having a predetermined frequency and a rated voltage value; and protection means for blocking the output of the inverter when an output current of the inverter exceeds a predetermined limit value, wherein the AC generator has a drooping characteristic that an output voltage of the AC generator is lowered following an increase of an output current of the AC generator, and wherein the drooping characteristic is a characteristic that the output voltage of the AC generator becomes less than the rated voltage value, when a value of the output current of the AC generator exceeds a set value which is set between the rated value and the limit value of the output current of the inverter.
    Type: Application
    Filed: April 26, 2005
    Publication date: November 3, 2005
    Applicant: Kokusan Denki Co., Ltd.
    Inventors: Masanori Nakagawa, Masahiko Endou, Kaoru Shinba, Katsumi Yamamoto, Yoshihiro Sugisawa
  • Patent number: 6940259
    Abstract: A generating device including a magneto generator, wherein: an AC control voltage is applied to an armature coil of the magneto generator from a battery via an inverter to change a phase angle of the AC control voltage, thus increase/reduce an output of the magneto generator and match the output of the generator with a target value; it is determined that a characteristic, in which the output of the magneto generator increases when the phase angle of the AC control voltage is delayed, is a normal control characteristic, and a characteristic, in which the output of the magneto generator decreases when the phase angle of the AC control voltage is delayed, is a reciprocal control characteristic; and it is determined whether a present control characteristic of the output of the generator relative to the phase angle of the AC control voltage is the normal control characteristic or the reciprocal control characteristic to decide, based on a determination result, a changing direction of the phase angle of the AC cont
    Type: Grant
    Filed: October 30, 2003
    Date of Patent: September 6, 2005
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Hideaki Suzuki, Masanori Nakagawa, Shuichi Muramatsu
  • Publication number: 20050104377
    Abstract: A method for controlling an inverter controlled generator set which comprises a DC power source section having as a power source a generator driven by an engine and an inverter which converts an output of said DC power source section into an AC output, the method comprising a step of controlling a rotational speed of the engine so that the AC output suitable for driving a load is output from the inverter; wherein, after the engine is started, the rotational speed of the engine is controlled by a constant speed control mode for maintaining the rotational speed of the engine at a set rotational speed, and the rotational speed of the engine is increased to the set rotational speed; and wherein an operation of the inverter is started after the rotational speed of the engine reaches the set rotational speed.
    Type: Application
    Filed: October 21, 2004
    Publication date: May 19, 2005
    Applicant: Kokusan Denki Co., Ltd.
    Inventors: Masanori Nakagawa, Masahiko Endou, Kaoru Shinba, Katsumi Yamamoto, Yoshihiro Sugisawa
  • Publication number: 20050093520
    Abstract: A generating device that includes an AC/DC conversion unit having a rectifier circuit that rectifies an output of a magneto rotor and applies the output to a battery, and an inverter circuit that converts a voltage of the battery into an AC control voltage and applies the AC control voltage to an armature coil of the magneto generator, performs chopper control that controls switch elements of the inverter circuit so as to interrupt an output current of the magneto generator to control the output of the magneto generator when a rotational speed of the magneto generator is lower than a set speed, and performs drive control that applies the AC control voltage from the battery through the inverter circuit to the armature coil when the rotational speed becomes higher than the set speed, and changes a phase angle of the AC control voltage to control the output of the magneto generator.
    Type: Application
    Filed: October 26, 2004
    Publication date: May 5, 2005
    Applicant: Kokusan Denki Co., Ltd.
    Inventors: Shuichi Muramatsu, Hideaki Suzuki, Masanori Nakagawa, Masakatsu Takahashi
  • Publication number: 20050030769
    Abstract: An inverter unit comprising component parts including at least an inverter and a filter which removes a high harmonic wave component from an output of said inverter, wherein said component parts are housed in an aluminum case having a bottom wall portion and a side wall portion, said filter includes a coil which is wound around a core extending straight and is arranged at a position closed to one end of said case, an end portion of said core being wound with said coil is arranged closed to an inner surface of said side wall portion of the case, and a ferromagnetic plate, which leads magnetic flux coming in and out said end portion of the core arranged closed to said wall portion of the case to the direction along the inner surface of the side wall portion of the case, is disposed between said end portion of said core and said inner surface of said side wall portion of the case.
    Type: Application
    Filed: August 4, 2004
    Publication date: February 10, 2005
    Applicant: Kokusan Denki Co., Ltd
    Inventors: Yoshihiro Sugisawa, Masahiko Endou, Masanori Nakagawa, Katsumi Yamamoto, Kaoru Shinba
  • Publication number: 20050029992
    Abstract: An inverter controlled generator set including: a power supply unit that uses a generator driven by an engine as a power supply to output a DC voltage; an inverter device that converts the output voltage of the power supply unit into an AC voltage; and a rotational speed control unit that controls a rotational speed of the engine so as to be kept at a target rotational speed suitable for a load applied to the inverter device, wherein the rotational speed control unit is comprised so that a settling time when the rotational speed of the engine is caused to converge to the target rotational speed in a state where the load is above a set value is longer than a settling time when the rotational speed is caused to converge to the target rotational speed in a state where the load is below the set value, in order to minimize an operation sound of the engine when the load is intermittently driven.
    Type: Application
    Filed: August 4, 2004
    Publication date: February 10, 2005
    Applicant: Kokusan Denki Co., Ltd.
    Inventors: Masahiko Endou, Masanori Nakagawa, Kaoru Shinba, Katsumi Yamamoto, Yoshihiro Sugisawa
  • Publication number: 20040233590
    Abstract: An inverter power supply device having first and second inverter units operated in series or parallel operation, and a controller to control said inverter units, wherein one output terminal of the first inverter unit is connected to one output terminal of the second inverter unit, and another output terminal of the first inverter unit and another output terminal of the second inverter unit are connected to high-voltage-load connection terminals, the one output terminal and the other output terminal of one of the inverter units are connected to one and the other of low-voltage-load connection terminals, a switch is connected between the high-voltage-load connection terminals, and said controller controls said inverter units so that outputs of said units are added together in phase and applied between the high-voltage-load connection terminals when said switch is turned off, and the outputs of said units are added together in phase and applied between the low-voltage-load connection terminals when said switch i
    Type: Application
    Filed: May 19, 2004
    Publication date: November 25, 2004
    Inventors: Masanori Nakagawa, Masahiko Endou, Katsumi Yamamoto, Kaoru Shinba, Yoshihiro Sugisawa
  • Patent number: 6820576
    Abstract: A vehicle driven by an internal combustion engine, which has a generator comprised so that: a crankshaft of the internal combustion engine is connected to drive wheels of the vehicle via a power transmission device having a centrifugal clutch; a rotor of a generator is connected to the crankshaft of the internal combustion engine via an acceleration mechanism; and in the case where the generator is operated to supply power to a load when the vehicle is stopped, the generator generates a nominal output while the internal combustion engine rotates at a certain rotational speed between an idle rotational speed and a clutch-in speed.
    Type: Grant
    Filed: June 10, 2003
    Date of Patent: November 23, 2004
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Kazuyoshi Kishibata, Masanori Nakagawa
  • Patent number: 6787931
    Abstract: A starter generator for an internal combustion engine including: a rotating electric machine having a magnet rotor mounted to a crankshaft of the internal combustion engine, and a stator with a three-phase first armature coil and a three-phase second armature coil; a first battery and a second battery connected in series or in parallel; a first driver circuit provided between the first armature coil and the first battery, and a second driver circuit provided between the second armature coil and the second battery; and an inverter that converts voltages of the first battery and the second battery into an AC voltage, wherein drive currents are supplied to the first armature coil and the second armature coil from the first battery and the second battery through switch circuits in the first driver and the second driver, when the engine is started, and induced voltages of the first armature coil and the second armature coil are supplied to the batteries through rectifier circuits in the first driver and the second
    Type: Grant
    Filed: July 16, 2003
    Date of Patent: September 7, 2004
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Masanori Nakagawa, Yutaka Inaba, Shuichi Muramatsu, Hideaki Suzuki
  • Publication number: 20040085047
    Abstract: A generating device including a magneto generator, wherein: an AC control voltage is applied to an armature coil of the magneto generator from a battery via an inverter to change a phase angle of the AC control voltage, thus increase/reduce an output of the magneto generator and match the output of the generator with a target value; it is determined that a characteristic, in which the output of the magneto generator increases when the phase angle of the AC control voltage is delayed, is a normal control characteristic, and a characteristic, in which the output of the magneto generator decreases when the phase angle of the AC control voltage is delayed, is a reciprocal control characteristic; and it is determined whether a present control characteristic of the output of the generator relative to the phase angle of the AC control voltage is the normal control characteristic or the reciprocal control characteristic to decide, based on a determination result, a changing direction of the phase angle of the AC cont
    Type: Application
    Filed: October 30, 2003
    Publication date: May 6, 2004
    Inventors: Hideaki Suzuki, Masanori Nakagawa, Shuichi Muramatsu
  • Publication number: 20040036294
    Abstract: A power supply device incorporated in a vehicle driven by an internal combustion engine including: a first power supply system for driving a vehicle load that converts an output of a generation coil provided in a generator driven by an internal combustion engine into a DC output to supply the DC output to an electrical load or electrical loads in the vehicle; and a second power supply system for driving an external load that converts an output of another generation coil provided in the generator into a DC output, then converts the DC output into an AC output at a commercial frequency with an inverter, and supplies the AC output to an external load, wherein the inverter is operated as a DC-DC converter to supply assisting power from the inverter through a switch to the first power supply system, when the output of the first power supply system is insufficient.
    Type: Application
    Filed: July 31, 2003
    Publication date: February 26, 2004
    Inventors: Kazuyoshi Kishibata, Masanori Nakagawa, Tooru Notsu
  • Publication number: 20040036295
    Abstract: A starter generator for an internal combustion engine including: a rotating electric machine having a magnet rotor mounted to a crankshaft of the internal combustion engine, and a stator with a three-phase first armature coil and a three-phase second armature coil; a first battery and a second battery connected in series or in parallel; a first driver circuit provided between the first armature coil and the first battery, and a second driver circuit provided between the second armature coil and the second battery; and an inverter that converts voltages of the first battery and the second battery into an AC voltage, wherein drive currents are supplied to the first armature coil and the second armature coil from the first battery and the second battery through switch circuits in the first driver and the second driver, when the engine is started, and induced voltages of the first armature coil and the second armature coil are supplied to the batteries through rectifier circuits in the first driver and the second
    Type: Application
    Filed: July 16, 2003
    Publication date: February 26, 2004
    Inventors: Masanori Nakagawa, Yutaka Inaba, Shuichi Muramatsu, Hideaki Suzuki
  • Publication number: 20040010360
    Abstract: A vehicle driven by an internal combustion engine, which has a generator comprised so that: a crankshaft of the internal combustion engine is connected to drive wheels of the vehicle via a power transmission device having a centrifugal clutch; a rotor of a generator is connected to the crankshaft of the internal combustion engine via an acceleration mechanism; and in the case where the generator is operated to supply power to a load when the vehicle is stopped, the generator generates a nominal output while the internal combustion engine rotates at a certain rotational speed between an idle rotational speed and a clutch-in speed.
    Type: Application
    Filed: June 10, 2003
    Publication date: January 15, 2004
    Inventors: Kazuyoshi Kishibata, Masanori Nakagawa
  • Patent number: 6652598
    Abstract: The present invention relates to a method for treating a weft knitted fabric containing a regenerated cellulose fiber in order to prevent or eliminate the weft bar of the fabric, as well as to a weft knitted fabric which has been subjected to such a method. A method for treatment of weft knitted fabric, which comprises applying a mellowing treatment to a weft knitted fabric containing a regenerated cellulose fiber and subjecting the resulting weft knitted fabric to an alkali treatment in its spread state.
    Type: Grant
    Filed: July 7, 2000
    Date of Patent: November 25, 2003
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Mari Shibata, Masanori Nakagawa
  • Patent number: 6570779
    Abstract: An inverter generation apparatus comprising means to obtain a reference duty ratio of predetermined switch elements of an inverter on-off driven to each of switch timings so as to have a desired waveform of an AC voltage obtained across load connection terminals, means to obtain correction coefficient for the duty ratio relative to a value reflecting a variation in an output voltage of a DC power circuit, means to obtain a real duty ratio by multiplying the reference duty ratio by the correction coefficient whereby the switch elements of the inverter are on-off driven in the real duty ratio so that the desired value of the AC voltage across the load connection terminals.
    Type: Grant
    Filed: October 4, 2001
    Date of Patent: May 27, 2003
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Mitsuyoshi Shimazaki, Masanori Nakagawa, Yutaka Inaba, Kaoru Shinba
  • Patent number: 6556457
    Abstract: A method of controlling a parallel operation of two inverter power generation apparatuses wherein an unbalance of outputs from the two inverter power generation apparatuses is cancelled by judging that the outputs of the two inverter power generation apparatuses have the collapse of the balance between them when a DC power supply voltage obtained from a DC power supply section exceeds a judgment value set at a value equal to or more than a non-load output voltage of the DC power supply section and allowing an overload operation of the inverter power generation apparatus of higher output voltage among the two inverter power generation apparatuses so as to lower the output voltage of the corresponding inverter power generation apparatus.
    Type: Grant
    Filed: January 3, 2002
    Date of Patent: April 29, 2003
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Mitsuyoshi Shimazaki, Kaoru Shinba, Masanori Nakagawa