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Mills and GMDs Maarten van de Vijfeijken looks at large, larger and the largest units in grinding ore T he gearless motor also called wrap-around motor or ring motor is a very large synchronous motor. The poles of the motor are directly installed on a pole flange on the mill shell this means the mill body becomes the rotor. The stator of the
Ball mills can be driving by medium voltage motors or wrap around motors, knows as Gearless Mill Drives GMD. The grinding mills are manufacture using steel plate and some casting parts.
In the past, grinding mills operating between 18 MW and 28 MW required a large electrical wrap-around motor, known as a Gearless Mill Drive GMD. The Metso QdX4 is an alternative option to the GMD. Until now, the gear-driven solution for large SAG and ball mills was limited to 18 MW.
Metso explained that in the past, grinding mills operating between 18MW and 28MW required a large electrical wrap-around motor, known as a gearless mill drive GMD. The Metso QdX4 mill drive system is an alternative option to the GMD. Until now, the gear-driven solution for large SAG and ball mills was limited to 18MW.
SAG Mill Speed The encouraging results motivated the change of all 32 plates in Due to electrical problems related to the wrap-around motor, the SAG February 2005. Such a sequence is shown in Table 3 ie. a combination mill speed was limited to 10 r.p.m. throughout 2004.
autogenous grinding SAG mills, or ball mills. The most important components of a GMD are the following ones The stator is a massive electro-mechanical structure built around the grinding mill, hence its alternative names wrap-around motor and ring motor see Figure 1. Its purpose is to
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Jul 01, 2011 gearboxes. The 400 is the KW power of the GEC Alsthom motors, which are 11000 volt. Asssembled in Australia in 1994 then shipped to New Zeland where they were used for 2230 hours . OTHER MILLS AVAILABLE 45,000 TONS PER DAY PROCESSING PLANT 1 unused 38 x 24.8 sag mill with 26,000 wrap around motor. 2 unused 22 x 36.5 Ball Mills with ...
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Mar 24, 2011 This can be accomplished using the wrap-around principle or the external principle, where the motor rotor is directly connected to the mill torque tube. Since the speed of these motors is extremely slow 15 RPM, the cost is high, the size tends to be rather large, and the problems with harmonics have been significant.
Gearless mill drives eliminate the mechanical components of conventional mill drives. By mounting the rotor poles directly onto the mill, the mill becomes the rotor of the gearless motor. The speed of the large synchronous machines also known as a wrap-around or ring motors is controlled using power electronics and magnetic fields.
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
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Mill productivity also depends on other factors number of the drum rotations, the grinding fineness, humidity and size of the crushed material, timely removal the finished product. Ball mills characterized by high energy consumption. When the mill idles, the energy consumption is approximately equal to the energy consumption with full mill ...
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