Patents by Inventor Matti Lounila

Matti Lounila 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).

  • Current measuring transducer operating on the compensation principle
    Patent number: 5309086
    Abstract: The invention relates to a current measuring transducer operating on the compensation principle, comprising two magnetic cores (C1, C2) with windows; windings wound thereon for both a current (Ip) to be measured and for a compensation current (Is); and means (Um, Nm, R1, D, IA) for generating the compensation current and adjusting the magnitude thereof. To compensate for induced interference voltages, a further winding (Nc1, Nc2) is arranged about both magnetic cores of the current transducer. To widen the frequency band, the windings (Nc1, Nc2) are series-connected in a closed loop through a frequency-dependent impedance (Z).
    Type: Grant
    Filed: March 25, 1993
    Date of Patent: May 3, 1994
    Assignee: ABB Stromberg Drives OY
    Inventors: Kai Johansson, Matti Lounila, Juha Kokkonen