Patents by Inventor Abraham TESFAMICAEL

Abraham TESFAMICAEL 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).

  • Electric motor having permanent magnet rotor and stator
    Patent number: 11705766
    Abstract: A permanent magnet motor comprises: a stator comprising teeth; and a rotor rotatable relative to the stator, the rotor having a plurality of poles, wherein each pole of the rotor comprises a pair of magnet retention slots, each magnet retention slot accommodating a magnet. Surfaces of the teeth of the stator facing the rotor are flat or have an arc shape. Each magnet retention slot may have a plurality of angled slot surfaces forming a first barrier around a corner of the magnet positioned closest to an outer surface of the rotor. At least three second barriers are positioned around a mid-axis extending along between the pair of the magnet retention slots. Each magnet retention slot comprises a slot surface slanted or curved relative to a second side surface of the magnet facing an inner surface of the rotor to form a third barrier around an end of the second side surface of the magnet.
    Type: Grant
    Filed: September 17, 2020
    Date of Patent: July 18, 2023
    Assignee: HL MANDO CORPORATION
    Inventors: Mazharul Chowdhury, Md Sariful Islam, Mohammad Islam, Abraham Tesfamicael
  • ELECTRIC MOTOR HAVING PERMANENT MAGNET ROTOR AND STATOR AND METHOD FOR DESIGNING THE SAME
    Publication number: 20220085671
    Abstract: A permanent magnet motor comprises: a stator comprising teeth; and a rotor rotatable relative to the stator, the rotor having a plurality of poles, wherein each pole of the rotor comprises a pair of magnet retention slots, each magnet retention slot accommodating a magnet. Surfaces of the teeth of the stator facing the rotor are flat or have an arc shape. Each magnet retention slot may have a plurality of angled slot surfaces forming a first barrier around a corner of the magnet positioned closest to an outer surface of the rotor. At least three second barriers are positioned around a mid-axis extending along between the pair of the magnet retention slots. Each magnet retention slot comprises a slot surface slanted or curved relative to a second side surface of the magnet facing an inner surface of the rotor to form a third barrier around an end of the second side surface of the magnet.
    Type: Application
    Filed: September 17, 2020
    Publication date: March 17, 2022
    Inventors: Mazharul CHOWDHURY, Md Sariful ISLAM, Mohammad ISLAM, Abraham TESFAMICAEL