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JMC rolls noise-free dc fans

Posted: 03 Jan 2003 ?? ?Print Version ?Bookmark and Share

Keywords:jmc products? panther fan? dc fan? cooling fan?

JMC Products has introduced its latest ultra quiet dc fan designs that features Panther fan technology. The product is said to operate at a higher frequency level than traditional fans. It is claimed to produce noise levels above the audible range for human hearing.

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.

The Panther fans operate at switching levels above 20KHz, producing a soft commutation that results in a quiet operation that is above the audible range for human hearing. The news fans are also claimed to consume lesser power than most fans on the market.

Panther fan technology can be incorporated into any of the company's dc fans ranging from 25mm to 120mm. They are suitable for PWM and temperature speed control of applications such as personal computers, servers, power supplies, and enclosures.

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