Patents by Inventor Thomas R. England

Thomas R. England 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).

  • Servo motor with high energy product magnets
    Patent number: 4954739
    Abstract: A dynamoelectric machine having a large magnetic gap between the rotor and the stator includes a slotless stator windings located within the large magnetic gap, and a mgnetic assembly consisting of radially aligned permanent magnets separated by non-magnetic material. The magnetic pole circumferential length and the radial gap length are proportioned such that the permanent magnets are operated at or near their maximum energy product.
    Type: Grant
    Filed: November 3, 1988
    Date of Patent: September 4, 1990
    Assignee: Kollmorgen Corporation
    Inventors: Roy D. Schultz, Thomas R. England, A. Clark Altizer
  • Method of making an electric motor
    Patent number: 4868970
    Abstract: A method of making an electric motor with the stator winding inside a slotless cylindrical stator shell.
    Type: Grant
    Filed: March 19, 1987
    Date of Patent: September 26, 1989
    Assignee: Kolimorgen Corporation
    Inventors: Roy D. Schultz, Thomas R. England, A. Clark Altizer
  • Dynamo electric machine with upwardly shifted ripple frequency
    Patent number: 4797592
    Abstract: A rotary electric dynamo machine in which the ripple component in the output occurs at a higher frequency. One half of the pole faces have a nonuniform airgap while the other half have a uniform air gap and cover a noninteger slot distance. The armature has an odd number of slots. Instead of the usual ripple component at the slot frequency, a dynamo constructed as described above, surprisingly, has a predominant ripple component at twice the slot frequency.
    Type: Grant
    Filed: June 17, 1982
    Date of Patent: January 10, 1989
    Assignee: Kollmorgen Technologies Corporation
    Inventor: Thomas R. England
  • Method of making a servo motor with high energy product magnets
    Patent number: 4679313
    Abstract: A method of making an electric motor with the stator winding inside a slotless cylindrical stator shell.
    Type: Grant
    Filed: March 8, 1985
    Date of Patent: July 14, 1987
    Assignee: Kollmorgen Technologies Corporation
    Inventors: Roy D. Schultz, Thomas R. England, C. Clark Altizor
  • Flux contoured rotary electromagnetic machine
    Patent number: 4538080
    Abstract: A brushless DC tachometer including an alternator which produces a substantially trapezoidal output signal coupled to an FET transistor switching bridge. The trapezoidal output signal is achieved using a block permanent magnet for one pole and a consequent pole contoured to achieve a substantially uniform flux density for the winding over a distance sufficient to produce a trapezoidal output signal.
    Type: Grant
    Filed: June 14, 1983
    Date of Patent: August 27, 1985
    Assignee: Kollmorgen Technologies, Corporation
    Inventor: Thomas R. England