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SKF recently developed a high-speed motor with magnetic bearing operating mode. Allegedly, the motor can reduce the energy consumption of sewage treatment plants, compared with the traditional blower drive system, the new motor can reduce energy consumption by 40%. In this sense, the potential for energy savings is enormous, as aeration blowers consume about 80% of the total energy consumption in sewage treatment plants.
SKF calculates: The new 350kW system saves 500,000kWh of electricity throughout the year, equivalent to a reduction of 375 metric tons of carbon dioxide emissions.
The above system (shown) includes a high speed permanent magnet motor (PMM) with a power range of 75-350 kW. This motor uses magnetic bearing control. Unlike traditional induction motors, high-speed permanent magnet motors can maintain constant efficiency at half the rated load and rated speed. At the same time, the new design uses fewer mechanical parts than conventional vented blower drives, reducing the need for post-maintenance. Added built-in monitoring and diagnostic capabilities to ensure system performance and reliability.
Vincent Megret, SKF's Magnetic Systems general manager, said the new drive system meets the need for high energy efficiency, reducing maintenance and service costs and meeting air quality and safety standards. He predicts that the 350kW system saves just one year's energy costs enough for the new system cost.
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