The SAG Mill Drive is mainly formed by a 11,000 HP. Ring Type Synchronous Motor of double winding, fed by two ThreePhased Cycloconverters. The rotor has salient poles without dumping windings and it consists of 72 poles. The cycloconverters work in the outofcirculation current mode and they are connected to a MVA transformer.
Siemens, the company that introduced Gearless Mill Drives (GMD) to mining industry started up its first GMD on a ball mill in Norway in 1980. The mill and its drive system are still in service. Today, GMDs are mainly used for SAG mills between 36 and 40 feet ( to m) and ball mills from 24 to 28 feet ( to m).
More powerful and larger mills, higher ball charges and demanding ambient conditions call for a strong partner for grinding solutions. We help you meet these challenges with our drive systems that come with a long track record in improving performance and extending technical frontiers of all three mineral grinding applications: Gearless mills, ringgeared mills and high pressure grinding rolls.
Read online for free. Molino
Guerrero and Pontt investigated the oscillatory torque caused by dead time in the current control of a highpower gearless mill drive. Szolc et al. ... In general, the motor can drive the ball mill to start. When =3 s, the clutch reaches the synchronous process and working speeds at and s, respectively.
COURSE DESCRIPTION CHH624 Gearless Mill Drive Operation and Maintenance Course goal The goal of this course is to provide participants with the required practical knowledge and in formation on safe operation and maintenance of the gearless mill drive (GMD) system.
ABB's GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This 'workhorse' for grinding operations combines a robust, servicefriendly and fit for purpose design to provide highest throughput, reliability and availability for your processing plant. eBook: Grinding transformation
Figure 3: Dual pinion ball mill with 6500 kW Low Speed Squirrel Cage Induction motors using VFC Figure 4: Two SAG Mills 24MW each and Two Ball Mills MW each with Gearless Mill Drives For larger applications the wellproven Gearless Mill Drive (GMD) technology has shown to be very effective since its
The six ABB GMDs, which are the most powerful mill drive systems on the market are all now in continuous operation. Two 28 MW gearless mill drive systems (GMDs) are operating in the mine's 40 foot SAG mills and four MW GMDS are employed in 26 football mills along with associated control systems.
Detail of Training Simulator: drive control section with the SINAMICS controllers and the interface board to power section Your challenge: Maximum operations at the bottleneck The Gearless Mill Drive (GMD) is potentially the most critical bottleneck in the mine production process. Each hour of downtime can result in a heavy financial loss.
For this expansion project, Kinross selected ABB to provide a 26 MW gearless mill drive system (GMD) for the mine's 40 ft SAG mill, as well as other drives, electrical infrastructure equipment and a longterm service agreement (LTSA). Joel Desmeules, Construction Manager for the SAG mill, at Kinross. "We are pleased with the ABB team's ...
fixedspeed or variablespeed mill drive requires the specification of several important engineering values: the motor rated output power, motor rated speed and the motor maximum speed. The motor rated output torque is calculated using these specified values as shown in Equation 1. This applies whether purchasing a large Gearless Mill Drive
A detailed animation showing the workings of a Gearless Mill Drive (GMD), created from a series of CAD files and insitu photographs.
The concern for the input current is ignored and not yet analyzed. ... due to its higher starting torque (120% is usually required [54]), at low frequencies. In addition, a gearless mill drive ...
ABB has received an order to replace the shaft mounted geared drives of existing conveyors in a European mine by GCD. The conveyors are connecting the mine with the power station. The gearless drive will be designed so that it can replace the geared drive unit without considerable modification of the existing drive pulley and main structure.
A modernization concept for a gearless mill drive that retains most of the existing electrical equipment Solution: • PLC system upgrade from SIMATIC S5 to SIMATIC S7 • Specially manufactured I/O adapters from S5 to S7 I/O boards that obviated the need for rewiring any I/O • Upgrade of HMI from COROS LSB to SIMATIC PCS7
These milling features provide an indication of the current milling efficiency as well as if current conditions may be causing excessive wear on liners. ... (then BBC: Brown Boveri Cie) installed the world's first Gearless Mill Drive (GMD) in 1969. This GMD powered a 16 feet (ft) cement mill in Le Havre (France), which today, some 40 ...
Gearless mill drives. Longer service intervals thanks to lowwear drive processes SIMINE Gearless mill drives' rpms can be tailored to your operations at any time, and are infinitely variable and uncomplicated. Whether manually or fully automatic rpms can be adjusted to account for the properties of the ore, resulting in significantly less
start the motor and to vary speed during operation, which means that it satisfies both requirements. The comparison of a conventional drive train to a gearless drive for a grinding mill is shown in Fig. 1. Figure 1 Top view of SAGMills with alternative drive options; left side: dual pinion drive including
gearless ringmotor. Typical gear driven mill and gearless mill with a ringmotor are shown in Figs. 1 and 2. Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pinions, MPa (5000 hp). The exception to this design was the Hibbing taconite operation. It used MPa (6000 hp) motors ...
Gearless mill drives are a well established solution for grinding applications in the minerals and mining industries. The paper describes the functionality and technical features of such drive systems as well as their advantages compared to other drive solutions.
To prevent accidental mill startup • An additional safety measure for maintenance work, when the inching drive is engaged Accessory kits To make the drive adaptable to other mills • Allows the inching drive to be portable and adaptable for additional mills • The kit includes: a sole plate, driven gear hub for mounting, coupling guard ...
Management of Companies and Enterprises Activities Related to Real Estate Electric Power Generation, Transmission and Distribution
© DZCrusher - كل الحقوق محفوظة
