Electricity + Control November 2016

ROUND UP

DRIVES, MOTORS + SWITCHGEAR

DRN asynchronous motor series sets new benchmark for IE3 compliance in Africa Stricter international regulations have meant that, as of the begin- ning of last year, all two-, four- and six-pole asynchronous motors with a power rating of 7,5 kW to 375 kW must meet the require- ments of energy-efficiency class IE3 in the European Union (EU). At the beginning of next year, IE3 will become applicable to all asynchronous motors with a power rating of 0,75 kW to 375 kW. While South Africa does not face the same regulatory pressure as the EU, SEW-EURODRIVE has decided to raise the benchmark locally by launching its new DRN series as its standard range of electric motors. who buys a gearbox or drive from us will automatically have an IE3-compliant motor,” Maleka explains. “What is equally important is the fact that the DRN series is downward compatible with our previous motors, regardless of the energy class. It fits right onto our gearboxes, for example, which means no additional effort on the part of our customers.” Another feature is a global stator, which boosts both parts availability and stockholding.

Commenting on the benefit of using energy-efficient motors such as the new DRN series, Maleka points out that the total cost of ownership of the equipment is reduced significantly over the long term. “Not only do we inform our customers about these benefits, but we also advise on application requirements. Our aim is to offer a total solution, as opposed to simply being a component supplier. Our expertise and experience stands us in good stead in this regard, with SEW-EURODRIVE celebrating its 85 th anniversary this year,” Maleka stresses. Enquiries:Visit www.facebook.com/SEWEurodriveSA

“We also have to take into account our customers across our borders. For example, if we supply an OEM in Africa carrying out a project in the US, the IE3 requirement has to be met.We not only supply the local market, but have to take our export obligations into account as well,” National Sales Manager Norman Maleka comments. In terms of South Africa, SEW-EURODRIVE will offer the DRN series as a complete new range. “It will set the standard. A customer

High speed motor design Technology progress in high speed motor design has led to ever-increasing rotating speeds for electric machines, enabling them to shrink in both volume and weight—ulti- mately leading to high power density and savings in energy consumption. But the surge in speed incurs in a number of design challenges, namely for mechanical rotors, bearings, and for thermal stability due to high frequency losses, among others. According to Gerald Masson, business development, new technologies and licens- ing manager at Moving MagnetTechnologies (MMT), high speed motor adoption has been a trend in Europe in the automotive industry and lately it has also been considered for applications in several other areas as well. “We specialise in designing brushless dc motor technologies and we have developed a specific technology for high speeds—mean- ing speeds higher than 20 000 rpm,” he says. “In fact, we have some prototypes running at 100 000 to 200 000 rpm. Very, very high speeds. For such velocities, we need some very specific and fitting design, while keeping it simple to manufacture.” Enquiries: Email ricardo.rosa@se10.com

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