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Voice Coil Motor aka Voice Coil Actuator

Voice Coil Motor aka Voice Coil Actuator

Voice Coil Motor aka VCM aka Voice Coil Actuator

Key Benefits

Uses

  • Where precision linear movement is required
  • Where precision force is required
  • Where oscillatory motion is required
  • Where Dynamic Movement is required

How it works

By driving a current through the voice coil, a magnetic field is produced. This magnetic field causes the voice coil to react to the magnetic field from a permanent magnet fixed to the speaker’s frame, thereby moving the cone of the speaker. By applying an audio waveform to the voice coil, the cone will reproduce the sound pressure waves, corresponding to the original input signal.

Materials

The actual wire employed in voice coil winding is almost always copper, with an electrical insulation coating, and an adhesive overcoat. Copper wire provides an easily manufactured, general purpose voice coil, at a reasonable cost. Pure copper in its International Annealed Copper Standard (IACS) as 100% IACS = 58 MS/m at 20 °C, decreasing by 0.393%/°C. Where maximum sensitivity or extended high frequency response is required from a loudspeaker, aluminium wire may be substituted, to reduce the moving mass of the coil. Aluminium wire has about one third of the mass of the equivalent gauge of copper wire, and has 61% of the electrical conductivity. An aluminum conductor’s cross-sectional area must be 56% larger than copper for the same current carrying capability.

Pride car subwoofer voice coils are made of CCAW Copper-clad aluminium wire, allowing easier winding and a useful reduction in coil mass compared to copper.

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