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voice coil

   Also found in: Acronyms, Wikipedia 0.01 sec.
voice coil
A type of motor used to move the access arm of a disk drive in very small increments. Like the voice coil of a speaker, the amount of current determines the amount of movement. Contrast with stepper motor, which works in fixed increments.
voice coil [′vȯis ‚kȯil]
(engineering acoustics)
The coil that is attached to the diaphragm of a moving-coil loudspeaker and moves through the air gap between the pole pieces due to interaction of the fixed magnetic field with that associated with the audio-frequency current flowing through the voice coil. Also known as loudspeaker voice coil; speech coil (British usage).
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We saw a little smoke coming from the voice coil which also heated up quite a lot.
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A voice coil working within a magnetic field is excited by the AC voltage applied by an audio amplifier.
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Engineers selected a high-performance voice coil motor with temperature-compensated neodymium magnets, an optical encoder displacement sensor, and a bifilar wound furnace for precise temperature control, leaving the drive shaft support and guidance system selection as the remaining vulnerable link in the chain.
... Porous carbon air bearings by Designfax
 
 
 
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