Patents by Inventor Alpo K. Vallinmäki

Alpo K. Vallinmäki 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).

  • Low harmonic rectifier circuit
    Patent number: 6965290
    Abstract: Non-linear inductor(s) are used to reduce the percent total harmonic distortion of the harmonics in the line currents in the input side rectifier system of an ac drive system. Several constructions for the non-linear inductor(s) are described. The non-linear inductor(s) may be constructed from E and I laminations. The gap depends on the construction of the middle leg of the E laminations and may have a step with a constant spacing or a variable spacing which depends on the stacking of the laminations. Alternatively the non-linear inductor(s) may be constructed from a toriodal core that either has a step gap or a variable type gap.
    Type: Grant
    Filed: August 6, 2003
    Date of Patent: November 15, 2005
    Assignees: ABB Inc., ABB Oy
    Inventors: Kalyan P. Gokhale, Alpo K. Vallinmäki, Nicklas Jan Anders Sodo
  • Method for making a non-linear inductor
    Patent number: 6922883
    Abstract: Non-linear inductor(s) are used to reduce the percent total harmonic distortion of the harmonics in the line currents in the input side rectifier system of an ac drive system. Several constructions for the non-linear inductor(s) are described. The non-linear inductor(s) may be constructed from E and I laminations. The gap depends on the construction of the middle leg of the E laminations and may have a step with a constant spacing or a variable spacing which depends on the stacking of the laminations. Alternatively the non-linear inductor(s) may be constructed from a toriodal core that either has a step gap or a variable type gap.
    Type: Grant
    Filed: August 6, 2003
    Date of Patent: August 2, 2005
    Assignees: ABB Inc., ABB Oy
    Inventors: Kalyan P. Gokhale, Alpo K. Vallinmäki, Nicklas Jan Anders Sodo
  • Low harmonic rectifier circuit
    Patent number: 6774758
    Abstract: Non-linear inductor(s) are used to reduce the percent total harmonic distortion of the harmonics in the line currents in the input side rectifier system of an ac drive system. Several constructions for the non-linear inductor(s) are described. The non-linear inductor(s) may be constructed from E and I laminations. The gap depends on the construction of the middle leg of the E laminations and may have a step with a constant spacing or a variable spacing which depends on the stacking of the laminations. Alternatively the non-linear inductor(s) may be constructed from a toriodal core that either has a step gap or a variable type gap.
    Type: Grant
    Filed: September 11, 2002
    Date of Patent: August 10, 2004
    Inventors: Kalyan P. Gokhale, Alpo K. Vallinmäki, Nicklas Jan Anders Sodo