Patents by Inventor Vesa Vauhkonen

Vesa Vauhkonen 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: 4920306
    Abstract: This invention relates to a method for controlling the torque of a synchronous machine supplied by a frequency converter, wherein starting from measured variables (i.sub.R, i.sub.S, i.sub.T, i.sub.f) representing the state of the machine the direct axis flux component (.psi..sub.d), the quadrature axis flux component (.psi..sub.q) and the pole angle (.delta.) for the machine are determined, and set values are produced for the flux (.psi. set value), excitation current (i.sub.fo set value) and current building the torque (i.sub.2 set value). To prevent the "pull out" of the drive in the method of the invention, from the determined pole angle (.delta.) there is formed, by means of a limiting block for the pole angle, a limited pole angle (.delta..sub.r) that equals the pole angle (.delta.) if the pole angle has an absolute value smaller than a separately adjustable limit (.delta..sub.max), but equals the limit (.delta..sub.max) if the pole angle has an absolute value equal to or greater than the limit (.delta..
    Type: Grant
    Filed: August 3, 1988
    Date of Patent: April 24, 1990
    Assignee: ABB Stromberg Drives OY
    Inventors: Matti Mard, Vesa Vauhkonen, Olavi Kangasaho