Key Role of Motor Cooling Fans for Ventilation

Electric motors generate heat during operation, which must be dissipated. For small and simply constructed electric motors, passive cooling is sufficient for this purpose, in which waste heat is dissipated to the ambient air via the cooling fins on the motor housing. For larger, powerful motors and electric machines, which in industrial applications are sometimes operated continuously or under harsh conditions, active air cooling is required. There is the principle of self-cooling and that of forced ventilation.

The principle of forced ventilation is different: Here, a fan is attached to the engine, which conveys air through the engine's cooling ducts independently of the operating speed. These external fans for motor cooling are also called forced ventilation units or forced cooling fans. The electric motors in many modern electric drives are controlled by frequency converters so that the speed is variable. The electric motors must be able to deliver high torques even in low speed ranges. However, the lower the motor speed, the lower the amount of cooling air generated by the synchronously running integrated fan wheel in motors with exclusive self-cooling.

This problem can be reliably solved by means of forced ventilation. The external fan, usually combined with a fan guard, has its own drive and power supply and therefore operates completely independently of the motor it supplies with cool air. The reliable air flow of the forced cooling fan ensures that the motor cooling is sufficient in every situation and under all possible operating conditions to prevent excessive operating temperatures and heat-related damage.

The market therefore clearly expects and demands solutions that are both absolutely reliable and trouble-free in operation, as well as economical. In this context, economical does not only mean inexpensive to install and as power-saving as possible, but maximum energy efficiency through optimum adaptation to the current demand, intelligent control technology, fail-safe operation and low maintenance costs.

LINGYUN offers an extremely versatile range of fans with AC or EC drives that operate reliably even under the toughest conditions (e.g. heat, cold, dust, dirt, moisture, aggressive chemical substances). External fans with internal-rotor or external-rotor motors can be installed for motor cooling or motor forced ventilation for controllable electric motors.

Fans for cooling electric motors must above all be reliable - and as flexible as the drives to be cooled themselves. Our fans offer maximum flexibility in voltage and frequency. Large pressure increases are just as possible as the delivery of permanently large air volumes. Overall, LINGYUN will guarantee long durability and the greatest possible reliability and functional safety for the entire service life of the fan.