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DC Brushless Cooling Fan Behavior

From NMB Technologies Corporation
 

 
DC brushless cooling fans have a history of effectively cooling electronic circuits. Today, DC brushless cooling fans are found in new applications and are being evaluated by engineers that may not have previously used fans in their products. These engineers may not be familiar with all of the "undocumented features" that are inherent to DC brushless cooling fans. If engineers are not familiar with all the characteristics of air-moving devices, they could be in for a nasty surprise. L Fan manufacturers typically specify the nominal speed of the fan, as well as an operating voltage range. In Figure 1, the data sheet shows the rated voltage as 12 V DC and the operating voltage range as 6 V DC to 18 V DC. What may not be clear is that all the performance characteristics of the fan, especially speed and airflow, correspond to the rated voltage of 12 V DC. If the voltage to the fan is decreased from this value, the speed and airflow will also decrease.
Product Announcements
NMB Technologies Corporation - Cooling Solutions
NMB offers a comprehensive line of more than 100 axial fans - ranging in size from 25 millimeters to 173 millimeters. Custom fan trays and other cooling assemblies are designed to solve thermal... (read more)
TEI - AC / DC Blowers
TEI
TEI manufactures a full line of AC/ DC fans and blowers, accessories and heat sinks. Fan options include tachometer output signal, locked rotor output signal, and temperature sensing speed control. (read more)
TEI - AC / DC Fans
TEI
TEI manufactures a full line of AC/ DC fans and blowers, accessories and heat sinks. Fan options include tachometer output signal, locked rotor output signal, and temperature sensing speed control. (read more)
JMC Products - 92x92x32mm DC Fan
The 92x32mm DC fan is thermally controlled and delivers a low noise level of 20dBA at low speed. Consuming very little power, the high-speed fan cools a system with an impressive 82 CFM, running at... (read more)
Pelonis Technologies, Inc. - High Efficiency AC/DC Fans
Pelonis Technologies' innovative line of new AC/DC fans provides the high performance of DC fan technology for AC operation. (read more)
JMC Products - Harsh Environment DC Fans
JMC offers a complete line of fully ruggedized DC fans that withstand severe environments. By applying a hard surface coating on the circuit board and other electronic components, JMC fans combat... (read more)
Rosenberg USA - Rosenberg Offers Uniquely Powerful EC Fans
Rosenberg's family of electronically commutated (EC) fans has expanded to include designs that deliver some of the highest available airflows and static pressures. Designed for HVAC, coils, equipment... (read more)
JMC Products - 70mm DC Fan
The 70x70x15mm fan is a unique size fan with high output results and low noise levels. Designed to easily incorporate on to any Intel® PIV solution, the 70mm fan is an ideal cooling solution for... (read more)
TEI - TA-B800AN Series AC Blower
TEI
TEI manufacture a full line of AC/ DC fans and blowers, accessories and heat sinks. Fan options include tachometer output signal, locked rotor output signal, and temperature sensing speed control. All... (read more)
 
Topics of Interest
Pulse Width Modulation (PWM) fan speed control methodology pulse-width modulates a fan's full-rated power supply voltage at a low frequency, typically 30 Hz. A typical PWM circuit, consisting of a... (Read More)
The article covers the electrical considerations for connecting the cooling fan of Power Amp Design power op amps to the signal circuits. All of the power op amps currently produced by Power Amp... (Read More)
Less than six years ago, thermal cooling in the electronics arena was mainly an issue for highperformance, high-end applications, such as, military, aerospace and large-scale industrial and medical... (Read More)
The brushless DC fan (BDC Fan) has become the air mover of choice in computing equipment, office automation products, home entertainment systems, and the like. Unlike conventional DC fans, the BDC fan... (Read More)
Variable speed drives are seeing ever increasing usage as an efficient way to control process temperatures by varying the airflow of an air cooler or cooling tower. Car must be taken, however, to... (Read More)