Patents by Inventor Katsushi Kawakami

Katsushi Kawakami 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).

  • Wind power generator
    Patent number: 8013459
    Abstract: When a wind velocity sensor detects a wind velocity higher than a predetermined level, a timer device starts a waiting timer function during an operation timer period shorter than the waiting timer period. After the waiting timer period is over, the waiting timer function is switched to an operation timer function, and a switching relay switches a generator to a motor only during an operation timer period. Then, a driving circuit performs a start assisting rotation. After the operation timer period is over, the waiting timer period re-starts. This process is repeated. When during this period, the number of rotations of a rotor monitored by a rotation number measuring device, based on the output voltage Vm of a three-phase conduction coil exceeds a predetermined number of rotations, the charging of a battery by a three-phase generator is started.
    Type: Grant
    Filed: October 23, 2008
    Date of Patent: September 6, 2011
    Assignee: Zephyr Corporation
    Inventors: Ryosuke Ito, Kiyoshi Sato, Hideaki Tamura, Katsushi Kawakami
  • WIND POWER GENERATOR
    Publication number: 20090079195
    Abstract: When a wind velocity sensor detects a wind velocity higher than a predetermined level, a timer device starts a waiting timer function during an operation timer period shorter than the waiting timer period. After the waiting timer period is over, the waiting timer function is switched to an operation timer function, and a switching relay switches a generator to a motor only during an operation timer period. Then, a driving circuit performs a start assisting rotation. After the operation timer period is over, the waiting timer period re-starts. This process is repeated. When during this period, the number of rotations of a rotor monitored by a rotation number measuring device, based on the output voltage Vm of a three-phase conduction coil exceeds a predetermined number of rotations, the charging of a battery by a three-phase generator is started.
    Type: Application
    Filed: October 23, 2008
    Publication date: March 26, 2009
    Applicant: ZEPHYR CORPORATION
    Inventors: Ryosuke Ito, Kiyoshi Sato, Hideaki Tamura, Katsushi Kawakami
  • Wind power generator
    Patent number: 7456510
    Abstract: When a wind velocity sensor detects a wind velocity higher than a predetermined level, a timer device starts a waiting timer function during an operation timer period shorter than the waiting timer period. After the waiting timer period is over, the waiting timer function is switched to an operation timer function, and a switching relay switches a generator to a motor only during an operation timer period. Then, a driving circuit performs a start assisting rotation. After the operation timer period is over, the waiting timer period re-starts. This process is repeated. When during this period, the number of rotations of a rotor monitored by a rotation number measuring device, based on the output voltage Vm of a three-phase conduction coil exceeds a predetermined number of rotations, the charging of a battery by a three-phase generator is started.
    Type: Grant
    Filed: November 13, 2003
    Date of Patent: November 25, 2008
    Assignee: Zephyr Corporation
    Inventors: Ryosuke Ito, Kiyoshi Sato, Hideaki Tamura, Katsushi Kawakami
  • Wind power generator
    Publication number: 20060249957
    Abstract: When a wind velocity sensor detects a wind velocity higher than a predetermined level, a timer device starts a waiting timer function during an operation timer period shorter than the waiting timer period. After the waiting timer period is over, the waiting timer function is switched to an operation timer function, and a switching relay switches a generator to a motor only during an operation timer period. Then, a driving circuit performs a start assisting rotation. After the operation timer period is over, the waiting timer period re-starts. This process is repeated. When during this period, the number of rotations of a rotor monitored by a rotation number measuring device, based on the output voltage Vm of a three-phase conduction coil exceeds a predetermined number of rotations, the charging of a battery by a three-phase generator is started.
    Type: Application
    Filed: November 13, 2003
    Publication date: November 9, 2006
    Inventors: Ryosuke Ito, Kiyoshi Sato, Hideaki Tamura, Katsushi Kawakami