Patents by Inventor Umamaheshwar Krishnamurthy

Umamaheshwar Krishnamurthy 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).

  • APPARATUS AND METHOD FOR PERMANENT MAGNET ELECTRIC MACHINE CONDITION MONITORING
    Publication number: 20130033215
    Abstract: An apparatus and method for determining a condition of an electric machine. Search coils are wound around stator teeth and the induced voltage is used to decouple stator and rotor fluxes. The decoupled fluxes allow for machine condition monitoring and fault diagnosis.
    Type: Application
    Filed: August 1, 2011
    Publication date: February 7, 2013
    Applicant: Illinois Institute of Technology
    Inventors: Umamaheshwar Krishnamurthy, Yao Da
  • Techniques and apparatus for the measurement of mutual inductance in a switched reluctance machine
    Patent number: 8125170
    Abstract: A system and technique for measuring the mutual inductance in a switched reluctance machine (SRM). In a first example embodiment of the technique, a voltage pulse is applied to primary coil when the machine is stationery. By measuring current in the primary coil and measuring induced voltages in adjacent open circuited coils mutual inductance may be determined. In another example embodiment, a voltage pulse is applied to the primary coil when the machine is stationery. The secondary coil is allowed to freewheel current through the phase. By measuring time taken by the primary phase to reach a preset value, the mutual inductance for the known position of a rotor can be determined.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: February 28, 2012
    Assignee: Board of Regents, The University of Texas System
    Inventors: Babak Fahimi, Umamaheshwar Krishnamurthy
  • SWITCHED RELUCTANCE MACHINE
    Publication number: 20110248582
    Abstract: A switched reluctance machine (SRM) having a rotor and stator pole numerical relationship of S number of stator poles and R number of rotor poles, where R=2S?2, when S is greater than 4; provides improved power density, torque production, torque ripple, and is readily adaptable to existing hardware such as known controllers and the like.
    Type: Application
    Filed: April 13, 2010
    Publication date: October 13, 2011
    Applicant: Illinois Institute of Technology
    Inventors: Piyush C. Desai, Ali Emadi, Umamaheshwar Krishnamurthy
  • TECHNIQUES AND APPARATUS FOR THE MEASUREMENT OF MUTUAL INDUCTANCE IN A SWITCHED RELUCTANCE MACHINE
    Publication number: 20080315896
    Abstract: A system and technique for measuring the mutual inductance in a switched reluctance machine (SRM). In a first example embodiment of the technique, a voltage pulse is applied to primary coil when the machine is stationery. By measuring current in the primary coil and measuring induced voltages in adjacent open circuited coils mutual inductance may be determined. In another example embodiment, a voltage pulse is applied to the primary coil when the machine is stationery. The secondary coil is allowed to freewheel current through the phase. By measuring time taken by the primary phase to reach a preset value, the mutual inductance for the known position of a rotor can be determined.
    Type: Application
    Filed: June 16, 2008
    Publication date: December 25, 2008
    Applicant: BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEM
    Inventors: BABAK FAHIMI, UMAMAHESHWAR KRISHNAMURTHY