Control apparatus for a linear motor for driving a pickup

Details Control apparatus for a linear motor for driving a pickup Control apparatus for a linear motor for driving a pickup

1988-10-12

1990-06-26

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Time-sharing or multiplexing systems

318561, 318594, 360 7807, H02K 3316

Patent

active

049375105

ABSTRACT:
A control apparatus for a linear motor for driving a pickup of an information storage/readout apparatus with which the pickup can be moved more quickly and accurately to a desired target position. A slider for supporting the pickup is provided which is movable in a straight line. A magnetic circuit for forming a magnetic gap extends in the moving direction of the slider. A moving coil is mounted on the slider having at least a portion located within the magnetic gap. The voltage induced across the moving coil is detected to product a signal indicative of the velocity of the pickup. A velocity feedback loop feeds back the detected voltage to a driving source of the coil. The value of the feedback coefficient of the velocity feedback loop is set in accordance with the operating mode of the apparatus.

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British Patent Office Search Report, Nov. 30, 1988, by Examiner M. J. Dixon.

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