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Voice Coil Actuators

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A voice coil is a kind of linear actuator, it moves a given mass along a line. To be precise, it pushes or pulls on the mass, the mass then moves as a result of this force. Thus a voice coil does not primarily move the mass, motion is a consequence of the force the voice coil applies to it. The name “voice coil” is due to one of its historically first applications: vibrating the paper cone of a loudspeaker. The name stuck and voice coils designed to move larger masses at slower speeds in other applications are still called “voice coils.” It is sometimes said that voice coils are intended for fast motion but they work just as well for slow motion. Again, a voice coil exerts a force, the consequence of that force depends on the circumstances. The voice coil works because of the force between a magnetic field and an electric current perpendicular to the field, what is called the Lorentz force. Below is a schematic diagram of a current-carrying wire (orange) and a magnet (blue). Arrows ind

Voice Coil Actuators Introduction A voice coil is a kind of linear actuator, it moves a given mass along a line. To be precise, it pushes or pulls on the mass, the mass then moves as a result of this force. Thus a voice coil does not primarily move the mass, motion is a consequence of the force the voice coil applies to it. The name �voice coil� is due to one of its historically first applications: vibrating the paper cone of a loudspeaker. The name stuck and voice coils designed to move larger masses at slower speeds in other applications are still called �voice coils.� It is sometimes…

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