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Oil-free compressed air at a fraction of the cost

By Gerald Ondrey |

The recently commercialized high-speed turbo (HST) compressors from BOGE Kompressoren Otto Boge GmbH & Co. KG (BOGE; Bielefield, Germany; www.boge.de) produce 100% oil-free (Class 0) compressed air at the highest degree of efficiency and with minimal maintenance effort, according to Matthias Eichler, head of Branding and Marketing Services. The HST compressors incorporate a number of design features that result in a “radical reduction” in the number of components compared to conventional compressors. As a result, BOGE was able to reduce the total costs, compared to oil-free screw compressors, by up to 30%, says Eichler. The new compressors (diagram) are driven by a permanent magnet motor, which is characterized by a very high energy density. Airfoil bearings are used — for the first time — in the drive shaft, which enables operation at extremely high speeds (up to 120,000 rpm). Titanium impellers, located at the end of the motor shaft, rotate at high speeds and set the intake air in motion. Thanks to the geometrical design of the impeller in conjunction with the diffuser and the spiral housing, the kinetic energy is effectively converted to pressure energy. A sophisticated cooling concept ensures effective cooling of the…
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