Patents by Inventor Jack S. Lawler

Jack S. Lawler 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).

  • Quasi square-wave back-EMF permanent magnet AC machines with five or more phases
    Patent number: 5642009
    Abstract: A new class of higher phase-order (five or more) quasi square-wave back emf permanent magnet machines including radial, axial and linear embodiments which employ a greater number of active phase windings during continuous operation, thereby utilizing more of the machine copper and magnet material.
    Type: Grant
    Filed: July 27, 1994
    Date of Patent: June 24, 1997
    Assignee: Electric Power Research Institute, Inc.
    Inventors: Patrick J. McCleer, J. Milton Bailey, Jack S. Lawler
  • Quasi square-wave back-EMF permanent magnet AC machines with five or more phases
    Patent number: 5394321
    Abstract: A new class of higher phase-order (five or more) quasi square-wave back emf permanent magnet machines including radial, axial and linear embodiments which employ a greater number of active phase windings during continuous operation, thereby utilizing more of the machine copper and magnet material.
    Type: Grant
    Filed: September 2, 1992
    Date of Patent: February 28, 1995
    Assignee: Electric Power Research Institute, Inc.
    Inventors: Patrick J. McCleer, J. Milton Bailey, Jack S. Lawler
  • Method of torque notch minimization for quasi square wave back EMF permanent magnet synchronous machines with voltage source drive
    Patent number: 5387854
    Abstract: A method for smoothing the torque characteristics of a multi-phase PM synchronous machine by controlled driving with a conventional voltage source inverter operated in accordance with a predetermined switching sequence wherein the sum of the excitation voltages applied to the incoming phase winding and outgoing phase winding are maintained constant at a predetermined value for the duration of each commutation period. In addition, the individual excitation voltages applied to the remaining phase active windings are also held constant during the commutation period.
    Type: Grant
    Filed: May 28, 1993
    Date of Patent: February 7, 1995
    Assignee: Electric Power Research Institute, Inc.
    Inventors: Patrick J. McCleer, Jack S. Lawler, Natarajan Narasimhamurthi