Danfoss Motor Drive New Technology Demonstrator Features SBE Power Ring Film Capacitors.

Danfoss Motor Drive at Hannover FairSBE is part of Danfoss’ new innovative motor integrated drive (VFD) project under development, in the perspective of size reduction. The design – adjustable to customer’s needs – offers longer life while providing a higher power density compared to traditional AC motor drives. The latest design was recently exhibited at the Danfoss Booth during the Hannover fair (April 2013).

Over the last four decades, power electronics technology has reduced VFD cost and size and improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software. Nevertheless, the DC Link capacitor has remained a limitation in reducing the size of the whole assembly.

Since 2004, SBE has developed a state-of-the-art design, characterized by its larger hollow internal core while maintaining its consistent performance even under the high temperatures which might occur inside the motor housing. The purpose of the larger core is to provide the capability of fitting the motor shaft and bearing inside it, thus making the best use of the available space. With a superior power density and maximum flexibility in capacitor design it’s the perfect match for today’s high performing motor drives. Apart from the mechanical advantage, the new SBE design has also kept its electrical features, mainly the highest ripple current capability per capacitance value and lowest temperature rise possible. The part is a 200µF, with a rated voltage of 700VDC; this specific capacitance value was defined by the space available inside the motor, although SBE has the winding capability to go higher, the limitation in that case would be the mechanical stress on the inside core. In a suitable connection system, the inductance could be as low as 15nH. The current RMS rating is also limited by the solder pins but could be as high as 100 Amps.

SBE is very excited about this opportunity to utilize our large core power ring to enable high performance next generation inverter designs” mentioned Dr. Michael Brubaker, SBE’s CTO, about the project.

The same motor integrated drive will also be exhibited at PCIM in May.

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