|
|
|
|
|
Hello everyone, JMC has made existing conventional PWM fans obsolete with the introduction of the PWM-Z (Zero) fans that stop spinning below 20% duty cycle. They will provide idle speed at 20%. The benefit of slowing the CPU and system fans as much as possible is to provide only the minimum air required. When the system is idle, the fan can be set to zero RPM, completely eliminating fan noise. Enjoy the newsletter |
||||
PWM-Z (Zero) Fans Stop Spinning at Low Duty Cycles The idle speed of a conventional PWM fan is very low but constant as shown in Figure 1 of the attached drawing. Figure 2 shows the new PWM-Z duty cycle curve that completely turns off the fan at low duty cycles. With the introduction of the PWM-Z, JMC is the first supplier to match 2 types of PWM designs specified in the microelectronics computer industry. PWM-Z fans are available from JMC in the following form factors:
|
||||
|
|
||||
|
The JMC 80x38 vane axial fan will produce about 110 CFM
at 7000 RPM in free air and has a maximum static pressure of 0.9
inches of water. The current is approximately 1.3 amps at 7000 RPM.
Production samples will be available in March 2005. |
||||
|
120x38mm Fixed Vane Fan Available NOW Our future plan roadmap includes a special LOW
COST version of this fixed speed fan and then adding PWM features
to this fan size family using micro-controlled firmware that includes
a soft start algorithm that prevents high start-up spike currents
without any added circuits and without any added cost. The soft
start feature is operational in 92mm fans and achieves full speed
in only 5 seconds, which is a vital requirement for high performance
air moving devices and chassis with multiple fans. To learn more
about this new 120mm fan design, contact
us today. |
||||
|
JMC's Fan Curves Incorporated into the System-Level Thermal Design
Tool MacroFlowTM Version 2.8
MacroFlow is a unique software tool that bridges the gap between quick but limited spreadsheet analysis and detailed but time-consuming Computational Fluid Dynamics (CFD) analysis for rapid and reliable system-level thermal design.
MacroFlow-based analysis allows scientific examination of different
|
||||
|
Riddle Me This - Enter to Win
What falls but never breaks? What breaks but
never falls? Congratulations to our Sept/Oct winner Ralf-Peter
Fietz of Fujitsu Siemens who won a JMC polo shirt! Sept/Oct
Riddle: If you were running a race, and you passed the person in
2nd place, what place would you be in now? Answer: You would be
in 2nd. You passed the guy in second place. |
||||
|
|
||||
JMC
launched final testing of the new 120x38mm fixed vane fan. Current
performance is fixed of speed 4500 RPM's producing 210 CFM at 0.85
Inch of water.
CLICK
HERE |
Copyright & Privacy | Webmaster | JMC Homepage |