OLKO-Maschinentechnik GmbH tapped Seimens to supply two Blair Multi-Rope machines to the the Woodsmith mine run by Sirius Minerals, a producer of polyhalite. One hoist is used as a so-called production winder for material hoisting. The other is used as a service winder for personal transport, with a capacity of 35 tons, Siemens reported. The Polyhalite is hoisted from approximately 1,450 m below sea level to the surface at a speed of 18 m per second. The delivery includes a medium-voltage synchronous motor with an output of 9.3 megawatts and a torque of 1,550 kilonewton meters for each machine, which are powered directly from a medium-voltage Sinamics SM150 (PWM) frequency converter.
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