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Panther Fans - Improved Acoustics (Patent
Pending)
JMC's new Panther fans are ready to pounce on fan noise - introducing
a fan technology that is so quiet, at low speed you can't hear it.
In traditional fans, the most dominant acoustic
noise is due to the fan’s motor switching noise. The stator
motion is a square wave that is switched on and off before and after
the peak torque position. This motion causes a small amount of undulation
in motor torque, producing an audible noise caused by the lower
frequency commutation operation. Each small torque causes a minute
contracting of the entire fan structure and results in an audible
clicking noise while the fan is operating.
Panther fans operate at switching levels above
20KHz, a much higher frequency level, producing a soft commutation
that results in a quiet operation that is above the audible range
for human hearing. Quiet operation is noticeable in Panther fans
running at low speeds as represented in the graph to the right.
Take a minute to view a live demonstration of our
Panther fans in action. Click
here to visit the audio and visual demo.
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