AIR-COOLED VOICE COIL ACTUATOR
FIG6B is a plot showing the mechanical efficiency of a mechanical resonant system using a voice coil actuator having a bobbin made from an electrically non-conductive material
By contrast, as shown in FIG6B, when an electrically non-conductive voice coil bobbin is used in the mechanical resonant system, such as the bobbin 160, then the eddy currents are reduced to zero and the voice coil actuator can operate at the low electrical resistance side of the curve. Ultimately, this results in a much higher mechanical efficiency for the mechanical resonant system 100.
plot
100
system
60
such as
200
air flow
2
about
['1. An air-cooled voice coil actuator, comprising: a bobbin made from a material that is electrically nonconductive; an electrical conductor coupled to the bobbin; a magnet assembly including: a housing, and a magnet coupled to the housing, the magnet including a centrally located opening defining a channel; and a cooling system; wherein the bobbin is positioned within a gap formed by the magnet and the housing; wherein the bobbin, the magnet, and the housing collectively define a flow path; wherein the bobbin and the magnet assembly are configured to oscillate when an alternating current is applied to an electrical conductor; and wherein the cooling system is configured to circulate an air flow through the channel and the flow path.']