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In the case of the gearless drives so far installed in cement factories, the mill and motor were in most cases combined to form a unit. With most of these installations, the motor is "wrapped around" the mill, a method which affords the following advantages: The overall length of the installation, and thus the building costs are reduced
Sep 23, 2014· There is a key difference in system analysis of geared and gearless mill foundations. In gearless motor foundations, one of the main tasks is to ensure that the foundation prevents the motor from deflecting or vibrating excessively. If this is done properly, then the motor and the motor piers will effectively behave as static structures.
Mill application features. Frozen charge protection – Detects frozen charge in the mill, minimizing equipment wear and liner replacements.; Coupling supervision – Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damages.; Standstill detection – Prevents the motors from restarting if the mill is still rocking or moving after a stop ...
speed due to severe vibrations (7 mm and > 300 mm/s) at some 7 Hz. This movement represents 50% of the air gap between Instability in gearless mill drive motors by Peter Warner, Anglo American Technical Division
Gearless Mill Drives Machinery Risk Solutions Practice 2009 Matt Dugalic, MARSH – MRSP Risk Consultant, VP ... condition of the motor. Reaching the operation temperature of the Ring motor the vibrations disappeared .
Our GMD eliminates all mechanical components of a conventional mill drive system, such as ringgear, pinion, gearbox, coupling, motor shaft and motor bearings: By mounting the rotor poles directly onto the mill, the mill itself becomes the rotor of the gearless motor.
Main competitors are the ring gear, as used at ndida, and a ring motor (gearless drive), either of which wraps around the mill. A third, less common method, is a conventional speed reducer ...
Sep 10, 2014· No mill or motor vendor, mill design company or independent consultant can truthfully claim this advantage. So let''s look at the observations in Svalbonas'' paper on gearless drives in [1]. The structural design of mills is much simpler than the structural design of ring motors. Most of the complexity in a mill is related to bearing design.
Siemens expands mining portfolio to include gearless drive system for 42foot SAG mills. Siemens is now able to provide to mining companies a gearless drive system for SAG mills with a tube diameter of 42 feet. This enables throughput to be almost doubled .
the SIMINE Gearless Mill Drives stops the mill with balanced charge, and with no timewasting oscillations. During creeping mode with rpm, the operator can directly control the mill while observing the mill and the material. Whether inching or creeping, you can dramatically shorten the mill''s maintenance times,
With successful operation of 2 x (Phu Kham, Laos) and three 2 x 7MW units under manufacture (Pascu Lama) and a further 40 projects worldwide, energy efficient Hyper Synchronous SER drives are now mature and ready for use on 2 X 10MW dual drive mills. Speed variation required is in the range of +/ 15% of synchronous motor speeds.
Ball Mill Vibration Analysis – Samac mbmttc . effect of ball mill vibrations on its main drive motor. palla vibrating mill parts 13 Feb 2014 humboldt vibrating ball mill Crusher South Africa 10/30/2012 khd palla effect of ball mill vibrations on its main » Learn More. palla vibrating mill parts. advantage vibrating mill FDP. Chat Now
The Gearless Concept The Gearless Drive avoids any contact between the rotating mill and the static parts of the motor. This enables a continuous workflow without maintenance on the gears or the pinions. What used to be downtime is now productive time. Vibrationfree, lowweight, shortcircuit proof design with high stiffness
The resonance already appeared during commissioning in July 1998 The problems occurred at cold condition of the motor. Reaching the operation temperature of the Ring motor the vibrations disappeared and the Gearless Drive was operated using the complete speed .
However, these methods are applicable for only two masses gearless drive systems (motor and rolls) and are not quite suitable for parallel electrical drives control in slabbing mill ...
HGT Gyratory Crusher. gearless ball mill 24x36 . Gearless Sag Mill Maintenance Schedules Crusher USA About gearless sag mill maintenance schedulesrelated information is a global company with customers and activities all over the world in this section you can stay updated on s business and gearless sag mill slip ring motor ball mill and sag mill construction company
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 GENERAL MOTORS CORPORATION VIBRATION STANDARD FOR NEW AND REBUILT MACHINERY AND ... Table Maximum Allowable Vibration Levels for Gearless Type Spindles 600 to 12,000 RPM (<= 400,000 DN) Table Maximum Allowable Vibration Levels for Gearless Type Spindles <600 ...
The grinding circuit comprises one 8530 mm diameter x 3650 mm semiautogenous mill driven by a 3954 kW variable speed dc motor, and one 5030 mm diameter x 8340 mm secondary ball mill driven by a 3730 kW synchronous motor. Four 1067 x 2400 mm vibrating feeders under the coarse ore stockpile feed the SAG mill via a 1067 mm feed belt equipped with ...
gearless motor mounted directly onto the mill. In addition, a gearbox can be used to reduce the speed of a high speed motor. This gearbox is then placed between the high speed motor(s) and pinion(s) and the low speed shaft driving the ring gear. Thus, there is the decision
The gearless drive avoids any contact between the rotating mill and the static parts of the motor. This allows for contin uous workflow without maintenance on the gears or the pinions. What used to be downtime is now productive time. Vibrationfree, lowweight, shortcircuit .
Gearless Mill Drive Comparison. Gearless mill drive comparison sme grinding mill motors gearless mill drive protection find the right and the top comparison of electric motors for ball mill preprint 13050 updates on geared vs gearless drive solutions for grinding mills gearless mill drive here we compare both the realestate area and the civil
The motor of the Gearless Drive provides the optimum solution between damping attributes and high stiffness. High stiffness together with low weight is required for high resonance frequencies in order to prevent vibrations. Stiffness and vibration analysis Every mechanical system must undergo stiffness and vibration analysis.
gearless motor is then wrapped around the mill. With this innovative concept the gearless mill drive (GMD) eliminates all critical mechanical components inherent within a conventional mill drive system, such as ring gear, pinion, gearbox, coupling or air clutch, motor shaft and motor bearings. Eliminating such components significantly increases the
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