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Bargteheide, Germany, 2008-10-21 SK 5xxE and SK 700E type frequency inverters can save re-sources by automatically reducing the magnetization of an asynchronous motor when the motor is operated under partial load. The motor current is thereby adjusted as needed, and heat losses are minimized.

Bargteheide – SK 5xxE and SK 700E type frequency inverters can save re-sources by automatically reducing the magnetization of an asynchronous motor when the motor is operated under partial load. The motor current is thereby adjusted as needed, and heat losses are minimized. If pumps, fans or conveyor belts are run at a slower speed, the electricity meter will therefore also turn at a slower pace. The majority of industrial drive systems can benefit from this savings effect.

The function is, however, not suitable for applications such as hoisting gears which depend on highly dynamic drives. When the automatic adjustment is active, both inverter series require up to 30% less energy than conventional models which provide constant magnetization over the whole speed range of the motor. Maximum cost advantages and environmental benefit can be achieved with typical partial loads between 10 and 15 percent of the maximum drive performance.