Cross-section through an SMP storage choke wrapped in a high-frequency wire strand.

A company offers inductive components for use in inverters for wind turbines. SMP says its chokes operate with low losses. Their compact design is maintenance-free for a long service life. The chokes are used in onshore and offshore installations.

To ensure that the alternating current fed into the grid exhibits a sinusoidal waveform it is essential to use filters consisting of capacitors and filter chokes in the inverter. To maximize inverter efficiency, these components must exhibit low losses.

The chokes are made from materials with low magnetostriction, eddy current, and hysteresis losses. The closed construction ensures a low-intensity stray field. Accordingly, this makes it possible for other components to be positioned around chokes without exposing them to magnetic influences from the choke.

The devices are available with the protection class of IP66 for use in offshore applications. This allows fitting the chokes outside the inverters, which means heat generated by the choke is discharged outside the inverters. The lower internal inverter temperature removes the need for cooling fans and helps conserve energy.

SMP chokes are for frequencies up to 200 kHz and currents as high as 1,000A. They are available with diameters ranging from 36 to 300 mm, weighing from 50 g to 130 kg. Protection types from IP00 to IP66 are available depending on the intended application. All components are compliant with RoHS and REACH restrictions, the materials used are UL listed.

Sintermetalle Prometheus
www.smp.de