Patents by Inventor Haran Chandra Karmaker

Haran Chandra Karmaker 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).

  • High speed induction machine
    Patent number: 11258322
    Abstract: In one embodiment, a high speed induction machine includes: a stator formed of a first plurality of laminations having a thickness of less than approximately 0.01 inch and a winding comprising a coil formed of Litz wire adapted about the stator; and a rotor adapted within the stator. The rotor may include: a rotor core formed of a second plurality of laminations having a second thickness of greater than approximately 0.10 inch and formed of high strength steel and sandwiched between a first end region including at least one first peripheral second lamination and a second end region including at least one second peripheral second lamination, the first end region having a first end ring retained by a first retaining ring adapted there around, the second end region having a second end ring retained by a second retaining ring adapted there around.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: February 22, 2022
    Assignee: TECO-Westinghouse Motor Company
    Inventors: Haran Chandra Karmaker, Edward Kuan-Chen Chen, James Arnold Keck, Paulo Guedes-Pinto
  • High Speed Induction Machine
    Publication number: 20200204022
    Abstract: In one embodiment, a high speed induction machine includes: a stator formed of a first plurality of laminations having a thickness of less than approximately 0.01 inch and a winding comprising a coil formed of Litz wire adapted about the stator; and a rotor adapted within the stator. The rotor may include: a rotor core formed of a second plurality of laminations having a second thickness of greater than approximately 0.10 inch and formed of high strength steel and sandwiched between a first end region including at least one first peripheral second lamination and a second end region including at least one second peripheral second lamination, the first end region having a first end ring retained by a first retaining ring adapted there around, the second end region having a second end ring retained by a second retaining ring adapted there around.
    Type: Application
    Filed: December 20, 2018
    Publication date: June 25, 2020
    Inventors: Haran Chandra Karmaker, Edward Kuan-Chen Chen, James Arnold Keck, Paulo Guedes-Pinto