Patents by Inventor Djordje Savinovic

Djordje Savinovic 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).

  • System and method for controlling a synchronous motor
    Patent number: 9018888
    Abstract: A synchronous electrical motor includes a rotor with a DC field winding. An exciter is configured to energize the DC field winding by generating a DC current in a first direction across the DC field winding when activated. A control system is configured to control a current flow across the DC field winding, the control system including a field discharge resistor and a by-passing circuitry. The by-passing circuitry is configured to implement a first by-passing to electrically by-pass the field discharge resistor during a current flow in the first direction across the DC field winding, and to implement a second by-passing to electrically by-pass the field discharge resistor during a current flow in a second direction across the DC field winding. The control system is able to direct all the DC current generated by the exciter to flow across the DC field winding.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: April 28, 2015
    Assignee: ABB Technology AG
    Inventors: Yujing Liu, Hongyang Zhang, Djordje Savinovic
  • System And Method For Controlling A Synchronous Motor
    Publication number: 20140232317
    Abstract: A synchronous electrical motor includes a rotor with a DC field winding. An exciter is configured to energize the DC field winding by generating a DC current in a first direction across the DC field winding when activated. A control system is configured to control a current flow across the DC field winding, the control system including a field discharge resistor and a by-passing circuitry. The by-passing circuitry is configured to implement a first by-passing to electrically by-pass the field discharge resistor during a current flow in the first direction across the DC field winding, and to implement a second by-passing to electrically by-pass the field discharge resistor during a current flow in a second direction across the DC field winding. The control system is able to direct all the DC current generated by the exciter to flow across the DC field winding.
    Type: Application
    Filed: April 23, 2014
    Publication date: August 21, 2014
    Inventors: Yujing Liu, Hongyang Zhang, Djordje Savinovic