Patents by Inventor Steven Christopher Birch

Steven Christopher Birch 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).

  • AC induction motor and method of starting same
    Patent number: 6787960
    Abstract: An AC induction motor has separate start and run windings radially separated in slots in the stator laminations. The start windings are arranged in the radially outer portions of the slots to aid heat dissipation and to increase the flux linkage so as to reduce inrush current during starting. The motor is started by switching on the start windings initially, and switching on the run windings in phase with the start windings when the motor reaches its running speed, but before switching off the start windings. In this way, the surge current during switching between the start and run windings is reduced.
    Type: Grant
    Filed: June 5, 2002
    Date of Patent: September 7, 2004
    Assignee: Eaton Corporation
    Inventors: Eric So, Steven Christopher Birch, Guy John Middleton
  • AC induction motor and method of starting same
    Publication number: 20020195987
    Abstract: An AC induction motor has separate start and run windings radially separated in slots in the stator laminations. The start windings are arranged in the radially outer portions of the slots to aid heat dissipation and to increase the flux linkage so as to reduce inrush current during starting. The motor is started by switching on the start windings initially, and switching on the run windings in phase with the start windings when the motor reaches its running speed, but before switching off the start windings. In this way, the surge current during switching between the start and run windings is reduced.
    Type: Application
    Filed: June 5, 2002
    Publication date: December 26, 2002
    Inventors: Eric So, Steven Christopher Birch, Guy John Middleton