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    Position detection for a track following servo system
    1.
    发明授权
    Position detection for a track following servo system 失效
    一个追踪伺服系统的位置检测

    公开(公告)号：US3593333A

    公开(公告)日：1971-07-13

    申请号：US3593333D

    申请日：1969-11-26

    Applicant: IBM

    Inventor： OSWALD RICHARD K

    IPC: G05D3/20 ,  G11B5/596 ,  G11B21/10

    CPC classification number: G05D3/20 ,  G11B5/59622

    Abstract: The invention relates to the positioning of a transducer relative to a desired information track on a magnetic disc. Alternate reference tracks on the disc are 90* out of phase with each other. Position error detection circuitry derives an error position signal and an automatic gain signal simultaneously from the signal induced in the transducer as a function of its position relative to the reference tracks on the disc. The automatic gain signal is provided even when the transducer is properly placed and allows for more accurate error position signals to be generated by the position error detection circuitry.

    CLOCKING SYSTEM FOR SERVO SIGNAL HAVING TWO OR MORE HARMONICALLY RELATED FREQUENCIES
    6.
    发明专利
    CLOCKING SYSTEM FOR SERVO SIGNAL HAVING TWO OR MORE HARMONICALLY RELATED FREQUENCIES 未知

    公开(公告)号：CA1121471A

    公开(公告)日：1982-04-06

    申请号：CA339710

    申请日：1979-11-13

    Applicant: IBM

    Inventor： OSWALD RICHARD K

    IPC: G11B5/596 ,  G11B20/14 ,  H03L7/08 ,  H03L7/087 ,  G06K19/08

    Abstract: 14 This invention is directed to a system for generating clock signals from a source signal having two harmonically related and phase coherent frequencies such as shown in U.S. Patent 3,534,344 (Santana) and U.S. Patent 3,879,753 (Dunn). The clock system employs a pair of synchronous demodulators for generating a phase error signal to control a voltage controlled oscillator (VCO). The source signal is applied to a pair of synchronous demodulators, each of which is supplied with a different carrier frequency. The output of each demodulator represents the area of the signal being demodulated. The output of each demodulator is zero and a null condition exists when the system is in a phase locked condition. At a non-locked condition, the output of one demodulator has multiple null points. The function of the second demodulator is to resolve the ambiguity between the desired and undesired null points. Carrier signals are generated under control of the VCO by dividing the output of the VCO signal to obtain carrier signals having the appropriate relationship to the source signal. SA978053

    POSITIONING SYSTEM EMPLOYING FEEDFORWARD AND FEEDBACK CONTROL
    8.
    发明专利
    POSITIONING SYSTEM EMPLOYING FEEDFORWARD AND FEEDBACK CONTROL 未知

    公开(公告)号：CA1100609A

    公开(公告)日：1981-05-05

    申请号：CA300244

    申请日：1978-03-31

    Applicant: IBM

    Inventor： OSWALD RICHARD K

    IPC: G05B13/00 ,  G05B11/36 ,  G05B13/02 ,  G05B19/23 ,  G05D3/12 ,  G11B5/55 ,  G11B21/08 ,  G05D3/00

    Abstract: POSITIONING SYSTEM EMPLOYING FEEDFORWARD AND FEEDBACK CONTROL A positioning system for moving a member between positions in time optimal fashion employs concurrent feedforward and feedback control. The feedforward control system provides coarse control and the feedback control system provides fine control to correct for deviations between the actual and a nominal system. The feedback loop may thus be of low bandwidth permitting desensitization to high frequency disturbances or the employment of inherently low bandwidth controlled variables. The feedforward control function includes successive portions of opposite polarity corresponding to acceleration and deceleration of the member and also includes a subtractive velocity related component. This function represents the approximate input to an electromagnetic coil actuator of a nominal system required to move such a member between positions in time optimal fashion.

    AUTOMATIC HEAD WIDTH CORRECTION
    10.
    发明专利
    AUTOMATIC HEAD WIDTH CORRECTION 未知

    公开(公告)号：CA1003103A

    公开(公告)日：1977-01-04

    申请号：CA179524

    申请日：1973-08-23

    Applicant: IBM

    Inventor： CHIEN JACK H ,  OSWALD RICHARD K

    IPC: G11B21/10 ,  G05B11/36 ,  G05D3/14

    Abstract: The invention relates to means for compensating for variations in the effective head gap width of a servo transducer used in a track following servo system and more specifically used within the environment of a magnetic storage system. The compensation is obtained by modifying the gain characteristic of the position error generating circuitry within the track following servo system. The method of determining the value of the compensating means and for its physical and electrical insertion position within the position error generating circuitry for different partitioned magnetic disk storage systems is also disclosed. In its simplest form, the compensating means is a resistor placed in series with the reference voltage in the AGC circuitry of the position error generating circuitry.

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