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| Home> | Plant, Process & Control | >Motors and drives | >Dual-pinion ball mill drive passes its test |
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Dual-pinion ball mill drive passes its test
04 August 2014
WEG has successfully tested low speed synchronous motors driven by frequency inverters for mills with dual pinions at its plant in Brazil. Due to complexity and cost, equipment is usually tested individually, however for this project, the entire unit was tested as a complete system before shipment to ensure reliability, as required by the application.
The tests were carried out over a period of four weeks and included two 4700kW 30-pole synchronous motors connected back-to-back and directly coupled to the shaft. They were driven by medium voltage model MVW01 frequency inverters producing a current of 1178A at 3.3kV alongside a phase-shifting transformer.
The equipment was tested at full load and provided a torque of 250,000Nm at the motor shaft.
The products are part of an order for electric motor drives for 18 ball mills and semi-autogenous grinding (SAG) mills with dual and single pinions. Autogenous grinding means that the mining ore essentially grinds itself. Such ball mills are used for grinding and crushing mining ore within a large rotating drum.
The project included the installation of a bypass on panels. The portfolio of WEG products for mills used in the mining and cement industries includes induction, synchronous or wound-rotor motors driven by frequency inverters or rheostats in case of constant speed for mills with single or dual pinion with load share.
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