Patents by Inventor Evert S. Cooper

Evert S. Cooper 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).

  • Patent number: 6850386
    Abstract: A method for positioning a control object using an optimum jerk profile to reduce excitation of mechanical resonances. A base set of control profiles is selected to describe jerk, acceleration, velocity and displacement of the control object during a seek. Notch functions are applied to the base jerk profile to provide a modified jerk profile having a value of zero at selected times during which maximum current is to be applied to move the control object. Normalized control profiles describing acceleration, velocity and displacement are generated from the modified jerk profile and thereafter used to move the control object. To suppress specific resonant frequencies of interest, the elapsed time of the seek is selected to coincide with a time at which a combination of the excitation energies associated with the resonant frequencies is at a minimum.
    Type: Grant
    Filed: April 11, 2002
    Date of Patent: February 1, 2005
    Assignee: Seagate Technology LLC
    Inventors: Svetlana I. Kovinskaya, Roy L. Wood, Evert S. Cooper
  • Publication number: 20030067710
    Abstract: A method for positioning a control object using an optimum jerk profile to reduce excitation of mechanical resonances. A base set of control profiles is selected to describe jerk, acceleration, velocity and displacement of the control object during a seek. Notch functions are applied to the base jerk profile to provide a modified jerk profile having a value of zero at selected times during which maximum current is to be applied to move the control object. Normalized control profiles describing acceleration, velocity and displacement are generated from the modified jerk profile and thereafter used to move the control object. To suppress specific resonant frequencies of interest, the elapsed time of the seek is selected to coincide with a time at which a combination of the excitation energies associated with the resonant frequencies is at a minimum.
    Type: Application
    Filed: April 11, 2002
    Publication date: April 10, 2003
    Applicant: Seagate Technology LLC
    Inventors: Svetlana I. Kovinskaya, Roy L. Wood, Evert S. Cooper
  • Publication number: 20020021526
    Abstract: A hard disk drive device (11) includes an actuator (16) controlling movement of read/write heads (20) relative to a stack (12) of rotating disks. A control arrangement (30) for controlling the actuator includes a control loop (50) using a model reference control portion (68, 76) to generate a first digital positioning signal component (72), and using a further control portion (66, 60, 62, 64) to generate a second digital positioning signal component. Two low-precision digital-to-analog converters (54, 56) respectively convert the first and second digital positioning signal components to respective analog positioning signal components (61, 59). A summing junction (57) combines the analog positioning signal components in a manner giving one greater weight than the other in a resulting analog positioning signal (48), which is applied to the actuator.
    Type: Application
    Filed: December 4, 1997
    Publication date: February 21, 2002
    Inventor: EVERT S. COOPER
  • Patent number: 4322769
    Abstract: This switch monitoring circuitry is particularly applicable to switching circuitry for operating a bipolar load device, frequently an inductor, on a source of direct current with four switches arranged to alternate the polarity of potential across the load device in a predetermined periodicity. Such circuitry often is arranged with diode devices individually connected across the switches, especially where the load device is an inductor. The monitoring circuitry specifically described comprises basic logical circuitry having coincidence gating circuits for activating status indicating circuitry; or for controlling associated circuitry for protecting or for compensating the switching circuitry; or for alarming operating personnel of malfunctioning switches.
    Type: Grant
    Filed: December 22, 1980
    Date of Patent: March 30, 1982
    Assignee: International Business Machines Corporation
    Inventor: Evert S. Cooper