voice coil


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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).

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.
References in periodicals archive ?
Instead of a cone connected to the voice coil at its apex, there is a set of linkages attached to the coil that are hooked to each of the blades in the assembly.
The patented advantages of stationary coils and a moving magnet, combined with a frictionless flexural suspension, deliver performance unavailable with voice coil or hydraulic based test systems.
There is also a voice coil that allows the ReFlex to simulate forces and friction via detailed vibrations of the display.
7 inch display model, Apple plans to include the "middle-mount open-loop voice coil motor" technology to control the camera movement, which should enable faster and more accurate focusing.
Ultrasonic Motor (USM) and Voice Coil Motor (VCM) ensure fast and near-silent
India, March 18 -- H2W has offered dual head voice coil air bearing positioning Stage (VCS15-050-AB-LV-2) that is a precision, air bearing, two axis positioning system for high end applications.
A new voice coil motor from Equipment Solutions of Sunnyvale, Calif.
The two subsidiaries in China are producing neodymium (Nd)-based alloys for high-performance magnets, which are used in motors for hybrid cars, electric power steering devices, and voice coil motors of hard disk drives.
The drive can be used with a brushless motor using external sinusoidal commutation, with an internally commutated brushless motor with Hall effect sensor feedback for smooth trapezoidal operation, a two-phase stepper motor, or up to two voice coil motors.
This paper presents a type of voice coil actuator (Morgan & Milligan, 1997); (***, 2005) which uses ferro fluid (Anton & Vekas, 2002) within the magnetic circuit.
Selected models operate in either torque or velocity modes for brushed, voice coil or brushless motors.
But while the CNC makes certain the amount of glue for connecting the suspension to the diaphragm and the diaphragm to the voice coil is precise, the machines are guided by human hands.