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Siemens has been commissioned to modernize the drive systems for four mills at the Collahuasi copper mine in northern Chile. The company will supply complete state-of-the-art drive systems comprising new motors and Flender couplings with torque limiting shear pin as well as new Sinamics SL150 cycloconverters with thyristor stacks.
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REVOLUTIONARY DRIVE CONTROLLER FOR GEARLESS MILLS L. Bomvisinho, ABB Switzerland Ltd, Baden-Dattwil, ... Ball and SAG mills are one of the most expensive pieces of equipment designed without redundancy, ... usually half-suppressed thyristor converters used for years with DC drives.
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Two mills typically used are Ball Mills and SAG Mills which form part of the early stages of the recovery of various metals such as gold, platinum, uranium, ... IGCT – Integrated Gate Commutated Thyristor LRS – Liquid Resistance Starters MV – Medium Voltage SGCT – Symmetrical Gate Commutated Thyristor
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The modernisation project includes two 8MW semi-autogenous grinding (SAG) mills and two 1.7MW ball mills with dual pinion drives. The new drive systems are replacing the existing synchronous motors and direct converters for the SAG mills and the drive systems of the ball mills, which were installed by a different manufacturer.
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Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pin-ions, 3.7 MPa (5000 hp). The exception to this design was the Hibbing taconite operation. It used two4.47 MPa (6000 hp) motors to drive a 1I-m-diam x 4.5-m long (36-ft-diam x 15 ft) autogenous mill. However, recent SAG mill designs now ...
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KEYWORDS: Thyristor converter, cycloconverter, harmonic distortion, synchronous motor drives. 1. INTRODUCTION Fast dynamic response and high overload capacity is needed in large power drive system for rolling mills. ... waveforms during the starting of a 20 MW SAG mill drive.
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SAG Mill Variable Speed Drive. SAG Mill Variable Speed ... Large semiautogenous mills can be effectively utilized in big mills but they must be kept fully ... The twin dc motor drive system with each motor connected to a pinion and each fed from a static thyristor power supply has been successfully installed and operated at the ...
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Application 2. Slip Power Recovery Drive System for a grinding mill SAG Mill and Motor The Best Solution: TMdrive-10SPR for each pump • The SPR drive carrying slip power is much smaller and less expensive than an MV drive carrying all the motor power at full speed (4 kV voltage)
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The modernization project includes two 8 MW SAG (semi-autogenous) mills and two 9.7 MW ball mills with dual pinion drives. The new drive systems are replacing the existing synchronous motors and direct converters for the SAG mills and the drive systems of the ball mills, which were installed by a different manufacturer.
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Simadyn Sag Mill In Thyristor. Motors 2 x 6.8 mw for the two ball mills and a 12 mw gearless drive for the sag mill with its filter circuits.a 14 mva load and its compensation of 2 x 2 mvar can represent the low-voltage loads.in this plant short-circuit currents appeared in the gearless drive when the electrical power company disconnected the external supply
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sag mill * system availability 99.5% An optimum solution every time Regardless of the task, Siemens has the optimum solution. We have the widest converter technologies portfolio on the market – everything from cycloconverters and current-source DC links to voltage-source 3-level DC link, modular multi-level and cell-based converters. Together ...
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Large PWM Inverters for Rolling Mills Hiromi Hosoda Toshiba Mitsubishi Electric Industrial Systems Corporation Drive Systems Department 1 Toshiba-cho, Fuchu-shi Tokyo 183-8511, Japan ... Inverters based on GTO (Gate Turn-Off Thyristor) devices were used in late 1990`s.
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Scope : The Mill Power_SAG Mills spreadsheet was designed to estimate the Net and Gross Power Demand (kW) Curso Simadyn SAG Mill 2012 Rev1. Chapter 7 – Grinding Mills - ScienceDirect. Curso Simadyn SAG Mill Curso Sag Mill – Codelco .RVN Reserve 3.00 5.0 Reserve 36.00 5.PR 1.30 100. internal emergency stop ramp EP22 Thyristor hold-off ...
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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 proper-ties of the ore, resulting in …
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in SAG mills with the direction of the reaction forces, which Measurements show that the current reaches the zero value produce a resulting component in the horizontal axis. The faster by gate pulse blocking than by tripping the feeding circuit structure of the stator, its winding design, the fixation of the breaker.
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SAG mill. A semi-autogenous grinding mill, or Sag mill, is responsible for grinding materials from large chunks into small, usable pieces for processing. The Sag mill is usually part of the primary stage in the grinding process. Pieces of raw or fairly … Read More Assembly and Details machine drawing pdf
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SAG Mill Control: It Shouldn't be ... followed by thyristor pulse blocking. The rotating mass of the mill load and the rotor inertia keep the mill turning during the ride-through period, which is adjustable from 0 to 1 second, with 200 ms the default.
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The thyristor switched power factor correction systems can be interesting to solve particular plant matters, for example to realize extra-rapid MV PFC solutions. This can be useful for reactive power compensation of MV loads which due to their …
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In future, two gearless mill drives and Sinamics cycloconverters will be used in the new production line with one SAG mill and one ball mill. Thus, one million tons of copper concentrate, 10 000 tons of molybdenum and four million ounces of silver oxide can be mined annually – even at an altitude of around 4600 m above mean sea level.
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