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Mar 01, 2000 0183 32 Main competitors are the ring gear, as used at Escondida, and a ring motor gearless drive , either of which wraps around the mill A third, less common method, is a conventional speed reducer...

Nov 11, 2018 0183 32 Gearless Warp Around SAG Mill For almost a decade now, very good operating experiences have been gained with a total of 28 gearless ring motor drives in the cement industry, driving tube mills with diameters of 25 to 4 ,...

Note that modern wrap-around gearless mill drives do a software correction to report mill motor output power which is the same as shell power Therefore, new gearless mill drives do not require any correction when comparing DCS power measurements to model power draw predictions Power predictions are only valid below motor rated speed...

Nov 07, 2021 0183 32 The SIMINE Gearless mill drives pump system significantly enhances concentrator productivity by eliminating the reducer gear between motor and pump and all corresponding maintenance In addition, the cyclone pumps with variable speed can adjust their energy consumption to the optimized flow of pulp, resulting in energy savings of up to 30 ,...

The poles of the gearless or synchronous motor also called wrap-around motor or ring motor are directly installed on the pole flange of the mill shell, turning the mill body into the rotor The stator is then wrapped around the mill The gearless motor is fed by a cycloconverter which has a rated output frequency of around 5 Hz for the GMD drive...

The GMD is also known as wrap-around motor or ringmotor Almost 25 years later, the first GMD with 120 MW power and 130 rpm was installed in the minerals industry Since then, , transmission of the torque between the motor and the mill is done through the magnetic field in the air gap between the motor stator and the motor rotor ....

Nov 11, 2018 0183 32 Gearless Warp Around SAG Mill For almost a decade now, very good operating experiences have been gained with a total of 28 gearless ring ,...

The wrap around motor is designed with so-called Roebel bars for the stator winding, which have a positive impact on the efficiency The mill itself is the rotor of the motor and it is a variable speed drive, bi-directional, positioning without additional motor, power from 5 to 36 MW, sensorless speed control and full torque through the whole ....

Jun 06, 2016 0183 32 Many large mills around the world Esperanza with a 128 m mill Cadia and Collahuasi with 122-m mills, and Antamina Escondida IV PT Freeport Indonesia, and others with 116-m mills have installed SAG mills of 20 MW Gearless drives wrap-around motors are typically used for large mills, with mills of 25 MW or larger having been designed...

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