Patents by Inventor Pär Holmberg

Pär Holmberg 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).

  • Induction devices with distributed air gaps
    Patent number: 6885273
    Abstract: A distributed air gap material for a induction device in power systems for minimizing fringe losses, mechanical losses and noise in the core The distributed air gap material occupies a selected portion of the core and is formed of a finely divided magnetic material in a matrix of a dielectric material particles. The air gap material has a zone of transition in which the permeability values vary within the air gap material.
    Type: Grant
    Filed: February 14, 2002
    Date of Patent: April 26, 2005
    Assignee: ABB AB
    Inventors: Pan Min, Li Ming, Rongsheng Liu, Mikael Dahlgren, Par Holmberg, Gunnar Russberg, Christian Sasse, Svante Söderholm
  • Transformer
    Patent number: 6867674
    Abstract: A power transformer having at least one high voltage winding and one low voltage winding. Each of the windings includes at least one current-carrying conductor, a first layer having semiconducting properties provided around said conductor, a solid insulating layer provided around said first layer, and a second layer having semiconducting properties provided around said insulating layer. The windings are intermixed such that turns of the high voltage winding are mixed with turns of the low voltage winding.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: March 15, 2005
    Assignee: Asea Brown Boveri AB
    Inventors: Thorsten Schutte, Par Holmberg, Jan Brangefalt, Christian Sasse, Peter Carstensen
  • Switchable flux control for high power static electromagnetic devices
    Patent number: 6801421
    Abstract: A high power static electromagnetic device with a flux path, a main winding and one or more regulation windings surrounding portions of the flux path. A control device is coupled to the flux path for selectively admitting the flux therein. In an exemplary embodiment, multiple flux paths are selectively turned on and off for including and excluding the regulation windings from the circuit. The windings may be formed of a magnetically permeable, field-confining insulating cable.
    Type: Grant
    Filed: September 29, 1998
    Date of Patent: October 5, 2004
    Assignee: ABB AB
    Inventors: Christian Sasse, Mats Leijon, Gunnar Russberg, Udo Fromm, Par Holmberg
  • Induction devices with distributed air gaps
    Publication number: 20030030529
    Abstract: A distributed air gap material for a induction device in power systems for minimizing fringe losses, mechanical losses and noise in the core The distributed air gap material occupies a selected portion of the core and is formed of a finely divided magnetic material in a matrix of a dielectric material particles. The air gap material has a zone of transition in which the permeability values vary within the air gap material.
    Type: Application
    Filed: February 14, 2002
    Publication date: February 13, 2003
    Inventors: Pan Min, Li Ming, Rongsheng Liu, Mikael Dahlgren, Par Holmberg, Gunnar Russberg, Christian Sasse, Svante Soderholm