Patents by Inventor Tomonaga Iwatsu

Tomonaga Iwatsu 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).

  • Method for manufacturing steel sheet for rotor core for IPM motor
    Patent number: 9847168
    Abstract: The present invention manufactures a steel sheet for a rotor core for an IPM motor, wherein the steel sheet has a magnetic flux density B8000 of 1.65 T or more as measured when magnetic field strength is 8000 A/m, and a residual magnetic flux density Br of 0.5 T or more as measured at that time, and optionally, a coercivity Hc of 100 A/m or more as measured after magnetization reaches 8000 A/m. By using the steel sheet manufactured according to the present invention for a rotor core of an IPM motor, it is possible to increase further an output torque in a high-speed rotational range and raise further the maximum rotational speed.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: December 19, 2017
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Tomonaga Iwatsu, Yukio Katagiri, Susumu Fujiwara, Akito Kawamoto
  • STEEL SHEET FOR ROTOR CORE FOR IPM MOTOR, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20160362762
    Abstract: The present invention provides a steel sheet for a rotor core for an IPM motor, wherein the steel sheet has a magnetic flux density B8000 of 1.65 T or more as measured when magnetic field strength is 8000 A/m, and a residual magnetic flux density Br of 0.5 T or more as measured at that time, and optionally, a coercivity Hc of 100 A/m or more as measured after magnetization reaches 8000 A/m. By using the steel sheet of the present invention for a rotor core of an IPM motor, it is possible to increase further an output torque in a high-speed rotational range and raise further the maximum rotational speed.
    Type: Application
    Filed: August 24, 2016
    Publication date: December 15, 2016
    Applicant: Nisshin Steel Co., Ltd.
    Inventors: Tomonaga IWATSU, Yukio KATAGIRI, Susumu FUJIWARA, Akito KAWAMOTO
  • STEEL SHEET FOR ROTOR CORE FOR IPM MOTOR, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20150047757
    Abstract: The present invention provides a steel sheet for a rotor core for an IPM motor, wherein the steel sheet has a magnetic flux density B8000 of 1.65 T or more as measured when magnetic field strength is 8000 A/m, and a residual magnetic flux density Br of 0.5 T or more as measured at that time, and optionally, a coercivity Hc of 100 A/m or more as measured after magnetization reaches 8000 A/m. By using the steel sheet of the present, invention for a rotor core of an IPM motor, it is possible to increase further an output torque in a high-speed rotational range and raise further the maximum, rotational speed.
    Type: Application
    Filed: March 27, 2013
    Publication date: February 19, 2015
    Applicant: NISSHIN STEEL CO., LTD.
    Inventors: Tomonaga Iwatsu, Yukio Katagiri, Susumu Fujiwara, Akito Kawamoto
  • METHOD FOR MANUFACTURING STEEL SHEET FOR ROTOR CORE FOR IPM MOTOR
    Publication number: 20150047746
    Abstract: The present invention manufactures a steel sheet for a rotor core for an IPM motor, wherein the steel sheet has a magnetic flux density B8000 of 1.65 T or more as measured when magnetic field strength is 8000 A/m, and a residual magnetic flux density Br of 0.5 T or more as measured at that time, and optionally, a coercivity Hc of 100 A/m or more as measured after magnetization reaches 8000 A/m. By using the steel sheet manufactured according to the present invention for a rotor core of an IPM motor, it is possible to increase further an output torque in a high-speed rotational range and raise further the maximum rotational speed.
    Type: Application
    Filed: March 27, 2013
    Publication date: February 19, 2015
    Applicant: NISSHIN STEEL CO., LTD.
    Inventors: Tomonaga Iwatsu, Yukio Katagiri, Susumu Fujiwara, Akito Kawamoto
  • Rotor for IPM motor, and IPM motor equipped with same
    Patent number: 8841810
    Abstract: A rotor iron core is used, which is formed by laminating a base steel sheets with a magnetic flux density (B8000) of 1.65 T or more as measured at a magnetic field strength of 8000 A/m and a coercivity of 100 A/m or more.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: September 23, 2014
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Tomonaga Iwatsu, Yukio Katagiri, Susumu Fujiwara, Shigeru Morikawa
  • ROTOR FOR IPM MOTOR, AND IPM MOTOR EQUIPPED WITH SAME
    Publication number: 20140015364
    Abstract: A rotor iron core is used, which is formed by laminating a base steel sheets with a magnetic flux density (B8000) of 1.65 T or more as measured at a magnetic field strength of 8000 A/m and a coercivity of 100 A/m or more.
    Type: Application
    Filed: March 27, 2012
    Publication date: January 16, 2014
    Inventors: Tomonaga Iwatsu, Yukio Katagiri, Susumu Fujiwara, Shigeru Morikawa