Patents by Inventor Pradeep Kumar Subrahmanyan

Pradeep Kumar Subrahmanyan 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).

  • Moving magnet voice coil motor using Halbach arrays
    Patent number: 7031116
    Abstract: An information handling system includes a base, a disc rotatably attached to the base, and an actuator assembly movably attached to the base the actuator assembly. An actuator assembly has an opening at the pivot therein. An actuator arm attached to the main body, and a voice coil motor is positioned within the opening of the actuator assembly. The voice coil motor also includes at least two magnets attached to the main body of the actuator arm. The magnets are arranged as a Halbach array. The voice coil motor is positioned within the opening of the actuator assembly, and near one end of the actuator assembly and at least one load spring and transducer are positioned at the other end of the actuator assembly.
    Type: Grant
    Filed: June 27, 2001
    Date of Patent: April 18, 2006
    Assignee: Seagate Technology LLC
    Inventor: Pradeep Kumar Subrahmanyan
  • Process for designing an optimal vibration isolation mount for a disc drive
    Patent number: 6999909
    Abstract: An optimal vibration mount for a disc drive is designed by computing external, ?, and internal, ?, disturbance models for the disc drive and defining an inertia matrix, M, for the disc drive. A state estimator, such as a Kalman filter, is defined based on the inertia matrix and external and internal disturbance models, and a covariance matrix, ?, is derived based on the filter algebraic Riccati equation. The state estimator gain, H, is calculated from ?(I 0)???1, and the optimal mount damping, B. and stiffness, K, parameters are derived from the state estimator gain and inertia matrix, H = ( M - 1 B M - 1 K ) .
    Type: Grant
    Filed: August 30, 2000
    Date of Patent: February 14, 2006
    Assignee: Seagate Technology LLC
    Inventor: Pradeep Kumar Subrahmanyan
  • Moving magnet voice coil motor using halbach arrays
    Publication number: 20020054458
    Abstract: An information handling system includes a base, a disc rotatably attached to the base, and an actuator assembly movably attached to the base the actuator assembly. An actuator assembly has an opening at the pivot therein. An actuator arm attached to the main body, and a voice coil motor is positioned within the opening of the actuator assembly. The voice coil motor also includes at least two magnets attached to the main body of the actuator arm. The magnets are arranged as a Halbach array. The voice coil motor is positioned within the opening of the actuator assembly, and near one end of the actuator assembly and at least one load spring and transducer are positioned at the other end of the actuator assembly.
    Type: Application
    Filed: June 27, 2001
    Publication date: May 9, 2002
    Applicant: Seagate Technology LLC
    Inventor: Pradeep Kumar Subrahmanyan