Thursday 3 September 2015

New range of 5-limb chokes target EMC problems.

A new range of 5-limb chokes targeting electromagnetic interference (EMI) problems in industrial applications has been launched by REO. The CNW range is available in two variants, the liquid cooled series-835 motor choke and the series-915 three-phase line choke. Offering a 40 per cent weight and volume reduction on previous models, the new CNW range features high thermal dissipation and a maximum current rating of 1200 A.

CNW MD 835
The recent rise of non-linear loads such as variable speed drives (VSDs), used to improve efficiency and energy savings, has caused an increase in electromagnetic interference (EMI) and as facilities have grown, so has the tendency for longer cable runs. These issues have led to problems such as overheating windings, harmonic currents and voltage distortion, resulting in shorter product lifetimes and fines.

The new CNW series dampens current peaks and voltage drops on the network caused by high frequency switching, smoothing the waveform and providing a clean sinusoidal current output.

"The 5-limb design of these new chokes is pivotal in tackling EMI," explained Steve Hughes, managing director of REO UK. "The design uses a combination of wound and unwound limbs to ensure that the choke can transfer and attenuate the EMI without unwanted thermal loading, which, if not dealt with, can lead to magnetic field leakage and cause common-mode and radio frequency interference (RFI) on nearby equipment.

"On top of this, we've optimised the design to remove excess material, resulting in a choke that is 40 per cent lighter and more compact than a typical setup with three separate single chokes. For use in motors the CNW series-835 also gains the use of liquid cooling for ultimate heat dissipation."

The new range of 5-limb chokes is part of REO's drive to make a complete and high-performance range of electromagnetically compatible (EMC) products available for applications ranging from industrial automation, food and beverage processing and packaging.

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