Patents by Inventor Randal A. Oyster

Randal A. Oyster 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).

  • Patent number: 4947072
    Abstract: A three phase two-pole induction motor includes a three phase winding wound as a two-pole winding with an effective full pitch wound winding connected in a double delta connection. Each pole group includes a plurality of coils wound as a concentric winding or as a short pitch lap wound equivalent winding. A 36 slot stator is illustrated and includes each phase winding wound with 2 coil units each having 2 coil groups. Each coil group has 3 concentric coils and in the illustrated concentric winding the one phase winding has one group with coil sides in slots 1-3 and 16-18 and the second group in slots 19-21 and 34-36. The next phase winding has similar coils in slots 4-6 and 25-27 and in slots 7-9 and 22-24. The third phase winding has similar coils in slots 10-12 and 31-33 and in slots 13-15 and 29-30. The coil sides of each of the two groups are connected to form a full pitch winding.
    Type: Grant
    Filed: October 21, 1988
    Date of Patent: August 7, 1990
    Assignee: A.O. Smith Corporation
    Inventors: William J. Watkins, Randal A. Oyster