© Gernot Walter

“Gets up to speed fast”

The EC centrifugal blower is making inroads into some unusual applications. Uwe Sigloch, Head of Ventilation and Air Conditioning Market Management at ebm-papst, tells us how.


What characterizes the EC centrifugal blower?

The EC centrifugal blower combines energy efficiency and high power density with fast start-up. Its control electronics are optimized so that it gets up to speed in a very short time. It’s up to speed in only three to four seconds, reaching air flow of up to 3,000 m3/h. Its power consumption is up to 30 percent lower than that of comparable AC fans.

The EC centrifugal blower combines energy efficiency and high power density with fast start-up. (Photo: Gernot Walter)

Where are such fans in demand?

Anywhere where fans with a fast start-up are needed, especially in air locks outside clean rooms in electronics production and in air curtains such as those in truck loading ramps. But they can also be used for cooling power electronics. Usually AC fans are used in these applications, but in many cases they no longer satisfy the requirements of the ErP Directive.

What advantages does the EC centrifugal blower have?

Thanks to the many forward-curved blades in the impeller, it’s quiet. Its noise is more pleasant than that of comparable fans, especially in the low-frequency range. And it’s very rugged and durable, thanks to its housing made of sendzimir galvanized sheet steel. The control electronics installed on the scroll housing are protected against moisture and dust. The electronics housing is made of die-cast aluminum and partly extends into the fan’s air-conducting scroll housing. That cools the electronics very well, which significantly increases the power density and service life.

Fans for air locks and air curtains are often operated in parallel connection. Isn’t that a problem for EC fans?

Uwe Sigloch, Head of Ventilation and Air Conditioning Market Management at ebm-papst (Photo: ebm-papst)

Until recently, that could be difficult due to disturbing harmonics. It was only possible to operate EC fans in parallel with additional measures such as interference suppression filters. Now we’ve developed a solution with integrated power factor correction. Active PFC reduces the harmonics and ensures that the requirements can be complied with without additional measures.

What about monitoring?

Our bus connection offers major advantages, especially when multiple fans are in use in air curtains. The fans can be controlled and monitored through the bus. For example, the operator has access to the fans from a central PC and can monitor their operating status, detect and diagnose faults, and initiate any necessary maintenance work. There is also smartphone-capable monitoring software available for wireless monitoring of the networked fans.

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EC centrifugal blowers

Innovative and unique with high power density