Patents by Inventor Rihito Kagawa

Rihito Kagawa 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).

  • Rotation-angle-detecting apparatus, rotating machine and rotation-angle-detecting method
    Patent number: 8564283
    Abstract: An apparatus for detecting a rotation angle using a magnet rotor comprising a magnet having 2N poles, wherein N is a natural number, and a sensor device for detecting the direction of a magnetic flux from the magnet rotor, at least one of two output voltages obtained in radial and rotational directions by the sensor device being multiplied by a correction coefficient, and the rotation angle being calculated from the two corrected output voltages to increase the detection accuracy of the rotation angle.
    Type: Grant
    Filed: February 3, 2009
    Date of Patent: October 22, 2013
    Assignee: Hitachi Metals, Ltd.
    Inventors: Masahiro Mita, Kyohei Aimuta, Osamu Shimoe, Rihito Kagawa
  • ROTATION-ANGLE-DETECTING APPARATUS, ROTATING MACHINE AND ROTATION-ANGLE-DETECTING METHOD
    Publication number: 20100321008
    Abstract: An apparatus for detecting a rotation angle using a magnet rotor comprising a magnet having 2N poles, wherein N is a natural number, and a sensor device for detecting the direction of a magnetic flux from the magnet rotor, at least one of two output voltages obtained in radial and rotational directions by the sensor device being multiplied by a correction coefficient, and the rotation angle being calculated from the two corrected output voltages to increase the detection accuracy of the rotation angle.
    Type: Application
    Filed: February 3, 2009
    Publication date: December 23, 2010
    Applicant: Hitachi Metals, Ltd.
    Inventors: Masahiro Mita, Kyohei Aimuta, Osamu Shimoe, Rihito Kagawa
  • High-voltage pulse generating circuit, and discharge-excited laser and accelerator containing such circuit
    Patent number: 5184085
    Abstract: A first high-voltage pulse generating circuit comprises a magnetic pulse compression circuit having a main saturable reactor provided with a reset circuit, the reset circuit being provided with a second saturable reactor for providing pulse voltage or current for setting a magnetic flux density of the main saturable reactor at a gate initiation point to a predetermined constant level. A second high-voltage pulse generating circuit comprises a magnetic pulse compression circuit having a main saturable reactor, a preset circuit for magnetizing the main saturable reactor to a saturation region thereof, and a set circuit for setting a magnetic flux density of the main saturable reactor at a gate initiation point to a predetermined constant level.
    Type: Grant
    Filed: April 22, 1992
    Date of Patent: February 2, 1993
    Assignee: Hitachi Metals, Ltd.
    Inventors: Shin Nakajima, Hiroyuki Aoyama, Rihito Kagawa, Osamu Shimoe
  • High-voltage pulse generating circuit, and discharge-excited laser and accelerator containing such circuit
    Patent number: 5072191
    Abstract: A high-voltage pulse generating circuit comprising a magnetic pulse compression circuit having a saturable reactor, and a variable inductor provided on the input side of the saturable reactor for controlling a pulse width of voltage pulse to be applied to the saturable reactor. This circuit may be used in discharge-excited lasers such as excimer lasers and accelerators such as linear induction accelerators.
    Type: Grant
    Filed: March 28, 1990
    Date of Patent: December 10, 1991
    Assignee: Hitachi Metals, Ltd.
    Inventors: Shin Nakajima, Osamu Shimoe, Rihito Kagawa