Patents by Inventor Seppo J. Ovaska

Seppo J. Ovaska 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).

  • Procedure for filtering the speed feedback signal
    Patent number: 5313549
    Abstract: A procedure is disclosed for filtering the speed feedback signal in an elevator motor drive which is provided with a speed controller and in which the speed of rotation of the motor is measured. The procedure of the invention involves sampling the speed feedback signal, producing a prediction of the next sample by a predicting procedure that filters the noise in the speed feedback signal, and forming an estimate of the latest sample by delaying the prediction by a time corresponding to one sample.
    Type: Grant
    Filed: June 3, 1992
    Date of Patent: May 17, 1994
    Assignee: Kone Elevator GmbH
    Inventor: Seppo J. Ovaska