Voice coil motor drive unit for magnetic disk drive having a wav

Details Voice coil motor drive unit for magnetic disk drive having a wav Voice coil motor drive unit for magnetic disk drive having a wav

1997-04-16

1998-12-01

Wysocki, Jonathan

Electricity: motive power systems

Induction motor systems

Primary circuit control

318434, 361 23, H02P 700

Patent

active

058443967

ABSTRACT:
The voice coil motor drive unit for a magnetic disk device includes a voice coil motor, a VCM driver, and a waveshaping unit. The voice coil motor has a coil and is driven in positioning and moving a magnetic head. The VCM driver supplies a driving current to the coil of the voice coil motor through a pair of power supply lines. The waveshaping unit shapes the waveform of the driving current supplied from the VCM driver to the voice coil motor into a waveform having a smooth leading edge. The waveshaping unit has a capacitor connected between the power supply lines, and a pair of Zener diodes having the same Zener characteristics and identical poles connected to two poles of the capacitor to be opposite to each other. Each of the Zener diodes has a Zener voltage which is set higher than a voltage applied to the coil in positioning the magnetic head, and lower than the voltage applied to the coil in moving the magnetic head.

REFERENCES:
patent: 4095163 (1978-06-01), Montague
patent: 4758920 (1988-07-01), McCartney
patent: 4941063 (1990-07-01), McCartney et al.
patent: 5416663 (1995-05-01), Atkins
patent: 5422777 (1995-06-01), Pezzani
patent: 5521768 (1996-05-01), Shrinkle et al.
patent: 5572397 (1996-11-01), Smith et al.
patent: 5576920 (1996-11-01), Kosuga et al.
patent: 5587876 (1996-12-01), O'Brien et al.

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