Patents by Inventor Per Germann Sorensen

Per Germann Sorensen 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).

  • Single phase asynchronous motor
    Patent number: 4119894
    Abstract: The invention relates to a single phase asynchronous motor having a main winding branch and an auxiliary winding branch for starting. The auxiliary branch has a first section having a first winding and a second section having a second winding and a capacitor in series. The second branch has a PTC resistor in shunt with the second winding and capacitor combination. This arrangement with the PTC resistor facilitates a design which involves selecting the number of turns and the resistance values of the auxiliary windings so that an optimum starting torque can be achieved at the cold temperature of the PTC resistor and a high breakdown torque can be achieved at the hot temperature of the PTC resistor.
    Type: Grant
    Filed: June 21, 1977
    Date of Patent: October 10, 1978
    Assignee: Danfoss A/S
    Inventor: Per Germann Sorensen