Patents by Inventor Shekhar Kubal

Shekhar Kubal 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).

  • Connection of an electric motor to a supply network
    Patent number: 8242719
    Abstract: Method and arrangement for connecting an AC electric motor (M1, M2, . . . MN) to an AC electricity network (L) in a system which comprises a frequency converter (FC), with which the motor is started, and contactors (S11, S12, S21, S22, SN1, SN2), in which method the supply source is changed by means of the contactors from the frequency converter to a direct network supply, in which method the frequency converter is stopped before changing the supply source, and in which method in connection with changing the supply source the control of the contactors is started before stopping the frequency converter.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: August 14, 2012
    Assignee: Vacon Oyj
    Inventors: Shekhar Kubal, Stefan Strandberg, Ahti Rauma
  • CONNECTION OF AN ELECTRIC MOTOR TO A SUPPLY NETWORK
    Publication number: 20090218962
    Abstract: Method and arrangement for connecting an AC electric motor (M1, M2, . . . MN) to an AC electricity network (L) in a system which comprises a frequency converter (FC), with which the motor is started, and contactors (S11, S12, S21, S22, SN1, SN2), in which method the supply source is changed by means of the contactors from the frequency converter to a direct network supply, in which method the frequency converter is stopped before changing the supply source, and in which method in connection with changing the supply source the control of the contactors is started before stopping the frequency converter.
    Type: Application
    Filed: February 27, 2009
    Publication date: September 3, 2009
    Inventors: Shekhar KUBAL, Stefan Strandberg, Ahti Rauma