Patents by Inventor Naruhiko Kudo

Naruhiko Kudo 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).

  • Patent number: 10465692
    Abstract: A fan motor is provided that prevents restraint on a rotor in an environment where oil and dust are floating in the air. The fan motor includes a stator constituted of an armature having a winding thereon, a rotor constituted of an excitation unit including a permanent magnet, and a vane wheel fixed to the rotor and including a plurality of vanes. The vanes or the vane wheel are formed so as to generate airflow from the side of a frame boss toward a hub unit of the vane wheel.
    Type: Grant
    Filed: April 9, 2014
    Date of Patent: November 5, 2019
    Assignee: SANYO DENKI CO., LTD.
    Inventors: Naruhiko Kudo, Munenori Takakuwa, Tatsuya Midorikawa
  • Patent number: 9033680
    Abstract: An electric fan is provided, including a labyrinth structure with increased performance of preventing entry of a liquid into a receiving space to receive a stator and a rotor. A clearance is defined between an opposed wall portion of a base and an opposed wall portion of an impeller body, which are opposed to each other in an axial direction of a rotary shaft, to form a labyrinth structure. The opposed wall portion of the base and the opposed wall portions of the impeller body are shaped to form a volume expanding portion within the clearance. The volume expanding portion is constituted from a groove portion for expanding the clearance, having a volume larger than other portions within the clearance.
    Type: Grant
    Filed: March 21, 2014
    Date of Patent: May 19, 2015
    Assignee: SANYO DENKI CO., LTD.
    Inventors: Naruhiko Kudo, Tomoaki Ikeda, Haruhisa Maruyama
  • Publication number: 20140314596
    Abstract: A fan motor is provided that prevents restraint on a rotor in an environment where oil and dust are floating in the air. The fan motor includes a stator constituted of an armature having a winding thereon, a rotor constituted of an excitation unit including a permanent magnet, and a vane wheel fixed to the rotor and including a plurality of vanes. The vanes or the vane wheel are formed so as to generate airflow from the side of a frame boss toward a hub unit of the vane wheel.
    Type: Application
    Filed: April 9, 2014
    Publication date: October 23, 2014
    Applicant: SANYO DENKI CO., LTD.
    Inventors: Naruhiko Kudo, Munenori Takakuwa, Tatsuya Midorikawa
  • Publication number: 20140205476
    Abstract: An electric fan is provided, including a labyrinth structure with increased performance of preventing entry of a liquid into a receiving space to receive a stator and a rotor. A clearance is defined between an opposed wall portion of a base and an opposed wall portion of an impeller body, which are opposed to each other in an axial direction of a rotary shaft, to form a labyrinth structure. The opposed wall portion of the base and the opposed wall portions of the impeller body are shaped to form a volume expanding portion within the clearance. The volume expanding portion is constituted from a groove portion for expanding the clearance, having a volume larger than other portions within the clearance.
    Type: Application
    Filed: March 21, 2014
    Publication date: July 24, 2014
    Applicant: SANYO DENKI CO., LTD.
    Inventors: Naruhiko Kudo, Tomoaki Ikeda, Haruhisa Maruyama
  • Patent number: 8556593
    Abstract: A counter-rotating axial-flow fan may be controlled to improve both cooling efficiency and operating efficiency. A first motor and a second motor are started in a given starting mode. Then, if the temperature of an object to be cooled is higher than a given reference temperature, the rotational speed of the first motor and the rotational speed of the second motor are controlled in a predetermined cooling efficiency mode that gives priority to cooling the object to be cooled over the operating efficiency of the counter-rotating axial-flow fan. If the temperature of the object to be cooled is equal to or lower than the given reference temperature, the rotational speeds of the first and second motors are controlled in a predetermined operating efficiency mode that maintains the object to be cooled at a temperature equal to or lower than the given reference temperature and reduces the power consumption of the counter-rotating axial-flow fan.
    Type: Grant
    Filed: October 28, 2008
    Date of Patent: October 15, 2013
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Honami Osawa, Naruhiko Kudo, Yoshihiko Aizawa
  • Publication number: 20110194955
    Abstract: An electric fan is provided, including a labyrinth structure with increased performance of preventing entry of a liquid into a receiving space to receive a stator and a rotor. A clearance is defined between an opposed wall portion of a base and an opposed wall portion of an impeller body, which are opposed to each other in an axial direction of a rotary shaft, to form a labyrinth structure. The opposed wall portion of the base and the opposed wall portions of the impeller body are shaped to form a volume expanding portion within the clearance. The volume expanding portion is constituted from a groove portion for expanding the clearance, having a volume larger than other portions within the clearance.
    Type: Application
    Filed: February 4, 2011
    Publication date: August 11, 2011
    Applicant: SANYO DENKI CO., LTD.
    Inventors: Naruhiko Kudo, Tomoaki Ikeda, Haruhisa Maruyama
  • Publication number: 20100260616
    Abstract: A counter-rotating axial-flow fan may be controlled to improve both cooling efficiency and operating efficiency. A first motor and a second motor are started in a given starting mode. Then, if the temperature of an object to be cooled is higher than a given reference temperature, the rotational speed of the first motor and the rotational speed of the second motor are controlled in a predetermined cooling efficiency mode that gives priority to cooling the object to be cooled over the operating efficiency of the counter-rotating axial-flow fan. If the temperature of the object to be cooled is equal to or lower than the given reference temperature, the rotational speeds of the first and second motors are controlled in a predetermined operating efficiency mode that maintains the object to be cooled at a temperature equal to or lower than the given reference temperature and reduces the power consumption of the counter-rotating axial-flow fan.
    Type: Application
    Filed: October 28, 2008
    Publication date: October 14, 2010
    Applicant: SANYO DENKI CO., LTD.
    Inventors: Honami Osawa, Naruhiko Kudo, Yoshihiko Aizawa
  • Patent number: 7227286
    Abstract: There is provided a fan motor in which an increase in the temperature of windings thereof is surpressed, thereby achieving a long life and high performance. Vent holes 33 for introducing air into a cup-like member 9 are formed in a bottom wall section 9b of a rotor 6. Air flowing direction adjusting ribs 37, which are arranged at intervals in a peripheral direction and each of which extends in a radial direction, are integrally provided on the inner surface of the bottom wall section 9 so that air flown out of exits 33b of the vent holes 33 is directed toward windings 3. In addition to the air flowing direction adjusting ribs 37, a plurality of air stirring ribs 39 for stirring the air inside the cup-like member 9 is arranged on the inner surface of the bottom wall section 9.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: June 5, 2007
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Naruhiko Kudo, Hiromitsu Kuribayashi, Toshiya Nishizawa
  • Publication number: 20050046284
    Abstract: There is provided a fan motor in which an increase in the temperature of windings thereof is surpressed, thereby achieving a long life and high performance. Vent holes 33 for introducing air into a cup-like member 9 are formed in a bottom wall section 9b of a rotor 6. Air flowing direction adjusting ribs 37, which are arranged at intervals in a peripheral direction and each of which extends in a radial direction, are integrally provided on the inner surface of the bottom wall section 9 so that air flown out of exits 33b of the vent holes 33 is directed toward windings 3. In addition to the air flowing direction adjusting ribs 37, a plurality of air stirring ribs 39 for stirring the air inside the cup-like member 9 is arranged on the inner surface of the bottom wall section 9.
    Type: Application
    Filed: August 18, 2004
    Publication date: March 3, 2005
    Applicant: Sanyo Denki Co., Ltd.
    Inventors: Naruhiko Kudo, Hiromitsu Kuribayashi, Toshiya Nishizawa
  • Patent number: 6828706
    Abstract: A molded part is formed of an insulating resin such that a stator, electronic components, and a circuit substrate are included inside the molded part. A protective layer for preventing breakage of electrical connection that might occur due to expansion or shrinkage of the molded part is provided at least between the electronic components and the molded part. The protective layer is formed of an insulating material having shear adhesion strength smaller than that of an insulating resin of the molded part that has been cured. The shear adhesion strength and the thickness of the protective layer are defined so that, when the expansion or shrinkage which might cause the breakage of the electrical connection has taken place in the insulating resin of the molded part, separation between the electronic components and the protective layer can be caused.
    Type: Grant
    Filed: January 16, 2004
    Date of Patent: December 7, 2004
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Naruhiko Kudo, Kakuhiko Hata
  • Patent number: 6809497
    Abstract: A drive unit for a brushless fan motor capable of easily controlling the rational speed of the motor without using PWM control. A power control circuit is provided for controlling the rational speed of the rotor by controlling the on/off operation of power feed semiconductor switch. The actual rotational speed of the rotor is compared with the target rotational speed. Based on the compared values, the turn-off time of the power feed semiconductor switch is controlled so that the rotational speed of the rotor may reach the target rotational speed fast and smoothly.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: October 26, 2004
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Naruhiko Kudo, Masato Murata
  • Publication number: 20040145250
    Abstract: A molded part 45 is formed of an insulating resin in such a manner that a stator 1, electronic components 15, and a circuit substrate 3 are included in its inside. A protective layer 53 for preventing breakage of electrical connection that might occur due to expansion or shrinkage of the molded part 45 is provided at least between the electronic components 15 and the molded part 45. The protective layer 53 is formed of an insulating material having shear adhesion strength smaller than that of an insulating resin of the molded part 45 that has been cured. The shear adhesion strength and the thickness of the protective layer 53 are defined so that, when the expansion or shrinkage which might cause the breakage of the electrical connection has taken place in the insulating resin of the molded part 45, separation between the electronic components 15 and the protective layer 53 can be caused.
    Type: Application
    Filed: January 16, 2004
    Publication date: July 29, 2004
    Applicant: Sanyo Denki Co., Ltd.
    Inventors: Naruhiko Kudo, Kakuhiko Hata
  • Patent number: 6683434
    Abstract: A drive unit for a brushless motor capable of permitting a rotor to be reliably rotated in a normal or positive direction during starting of the motor. A power control circuit is so constructed that a power feed semiconductor switch may have turn-on time set to a level required or sufficient to permit the rotor to get out of a negative torque region during starting of the brushless motor and turn-off time set to a level sufficient to permit the rotor to race after lapse of the turn-on time. Starting operation by repeat of the turn-on time and turn-off time is carried out at the number of times required to rotate the rotor in a normal or positive direction.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: January 27, 2004
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Masato Murata, Naruhiko Kudo
  • Patent number: 6551074
    Abstract: A centrifugal fan capable of exhibiting enhanced waterproof performance without using a resin mold while being simplified in structure. Air is sucked from one axial side of a revolving shaft of an electric motor and discharged in a radial direction of the revolving shaft. A second side wall of a casing and a wall of a blade support of an impeller have opposite surface portions arranged opposite to each other in an axial direction of the revolving shaft, respectively. The opposite surface portions are formed into a configuration which permits the opposite surface portions to cooperate with each other to provide a labyrinth structure for preventing water from intruding into a space defined between a cup-like member and the second wall from an outside in the radial direction of the revolving shaft. A first side wall and the second side wall are formed with drainage through-holes.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: April 22, 2003
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Naruhiko Kudo, Kesatsugu Watanabe
  • Publication number: 20020039013
    Abstract: A drive unit for a brushless motor capable of permitting a rotor to be reliably rotated in a normal or positive direction during starting of the motor. A power control circuit is so constructed that a power feed semiconductor switch may have turn-on time set to a level required or sufficient to permit the rotor to get out of a negative torque region during starting of the brushless motor and turn-off time set to a level sufficient to permit the rotor to race after lapse of the turn-on time. Starting operation by repeat of the turn-on time and turn-off time is carried out at the number of times required to rotate the rotor in a normal or positive direction.
    Type: Application
    Filed: September 28, 2001
    Publication date: April 4, 2002
    Applicant: Sanyo Denki Co., Ltd.
    Inventors: Masato Murata, Naruhiko Kudo
  • Publication number: 20020039014
    Abstract: A drive unit for a brushless fan motor capable of easily controlling the rotational speed of the motor without using PWM control. A power control circuit is provided for controlling the rotational speed of the rotor by controlling the on/off operation of power feed semiconductor switch. The actual rotational speed of the rotor is compared with the target rotational speed. Based on the compared values, the turn-off time of the power feed semiconductor switch is controlled so that the rotational speed of the rotor may reach the target rotational speed fast and smoothly.
    Type: Application
    Filed: September 28, 2001
    Publication date: April 4, 2002
    Applicant: Sanyo Denki Co., Ltd.
    Inventors: Naruhiko Kudo, Masato Murata
  • Publication number: 20020025261
    Abstract: A centrifugal fan capable of exhibiting enhanced waterproof performance without using a resin mold while being simplified in structure. Air is sucked from one axial side of a revolving shaft of an electric motor and discharged in a radial direction of the revolving shaft. A second side wall of a casing and a wall of a blade support of an impeller have opposite surface portions arranged opposite to each other in an axial direction of the revolving shaft, respectively. The opposite surface portions are formed into a configuration which permits the opposite surface portions to cooperate with each other to provide a labyrinth structure for preventing water from intruding into a space defined between a cup-like member and the second wall from an outside in the radial direction of the revolving shaft. A first side wall and the second side wall are formed with drainage through-holes.
    Type: Application
    Filed: August 21, 2001
    Publication date: February 28, 2002
    Inventors: Naruhiko Kudo, Kesatsugu Watanabe
  • Fan
    Patent number: D732655
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: June 23, 2015
    Assignee: SANYO DENKI CO., LTD.
    Inventors: Koji Ueno, Naruhiko Kudo