With this innovative concept the gearless mill drive eliminates all critical mechanical components inherent within a conventional mill drive system, such as ring gear, pinion, …

Eleven 5MW gearless drives with synchronous motors running at low speeds (50-60rpm) drive three conveyors; two with four motors each and one with three. Two 20MW conveyors transport the ore from the open pit operation to the surface, overcoming an elevation change of around 1,300m, while the second conveyor feeds into a slightly smaller, 15MW ...

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.

4 GEARLESS MILL DES Built-in features The GMD eliminates the need for ring gear, pinion, gearbox, coupling, motor bearings. Meanwhile, inching and creeping functionalities are provided by the drive control software, making an additional inching motor unnecessary. The drive system, including the gearless motor,

The gearless mill drive (GMD) has been continuously developed since its introduction in 1969. The structural design, the electrical parts and of course motor monitoring and control have all experienced major developments that have enabled larger, more efficient operations and higher productivity.

E Primary SAG, 34x1 6 Two variable speed ac motors coupled mill, $4 million 22,500 to a gear drive with air clutches. motor, $1.75 million each 6000 Two secondary ac synchronized motor coupled to a gear mill, $2.5 million ball mills, 18x27 drive with an air clutch. motor, $602,000 6050 F Ptimary SAG, 34x16 Ringmotor system. mill, $3.1 …

the controller accelerates the mill smoothly back to operational speed when the voltage is recovered. Over-duty cycle mode In case of mill overloading, the over-duty cycle permits operators to correct the feed rate while keeping the mill running. The drive system generates additional torque for a certain amount of time to overcome the overload.

next size Gearless Mill Drive, i.e. a 42ft mill. It is a dual design approach considering, on the one hand, the experi-ences Siemens made with Gearless Mill Drive (GMD) instal-lations over the past 40 years and, on the other hand, using computerized design tools calculating the system behavior where experience does not yet exist.

The QdX4™ Mill Drive features internal torque splitting capability transmitting motor input power to the pinion shaft and equally dividing into two mill pinions. This type of torque splitting gear box technology has been in operation since the early 1960's. We have rearranged the drive architecture in order to apply high powered ...

the a GMD system Participant profile This training is targeted to operators, electricians, technicians and site engi-neers. Prerequisites Participants should have basic electro technical background. It is highly recommended that the par-ticipants successfully completed the "Gearless Mill Drive –Theoretical System Overview" (CHH621). Topics

The Gearless Mill Drive system consists of the ring motor with its feeding cycloconverter, pre-installed in an E-house. It also includes the excitation rectifier, the automation sys-tem (for mill and motor) including HMI, monitoring and diagnostic system, MCC's (for mill and … See more

The ABB gearless mill drive (GMD) is the most powerful mill drive system available, combining the highest levels of efficiency, reliability, flexibility and availability. The …

The ABB gearless mill drive is the most powerful mill drive system on the market. It provides highest availability, long- ... This is achieved by eliminating all mechanical components of a conventional mill drive system (ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings). Features – Power rating: 5–36MW – Mill diameter ...

Building on over 130 years of experience in the mining industry, ABB's Ring Motor factory located in Galindo provides the engineering and manufacturing of ring motors, the main component of ABB's Gearless Mill Drive (GMD) systems manufactured by ABB for the mining sector. The 20,000 m2 plant manufactured over 110 motors delivered in over 25 …

Abstract—A cycloconverter-fed gearless mill drive is a drive system that has hardware and software protection functions to protect the equipment in case of abnormal operating …

Abstract. Gearless mill drives are a well established solution for grinding applications in the minerals and mining industries. The paper describes the functionality and technical …

ABB gearless mill drive (GMD) system explained in 3 min. Highest power, availability and energy savings up to 3%. Unlike more traditional ring-geared mill drives – where a ring-shaped gear encircles the mill and drives it through one or two pinions followed by conventional motors – GMDs work by mounting rotor poles directly to the mill body ...

Abstract: A cycloconverter-fed gearless mill drive is a drive system that has hardware and software protection functions to protect the equipment in case of abnormal operating conditions, malfunctions or failures. For demanding applications in the mining industry, protections systems need to be reviewed considering special or …

gearless mill drive optical systems T18:08:45+00:00 Gearless mill drives Grinding ABB. 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 ...

ABB was recently contracted to supply gearless mill drive (GMD) systems for two 38 foot semiautogenous grinding (SAG) mills at the Serra Azul iron ore mine in Brazil. The Serra Azul mine unit, owned by MMX Mineração e ­Metálicos, an EBX Group company, is located in the iron quadrangle of Minas Gerais, next to Belo Horizonte – the heart of ...

This paper describes improvements in the protection system implemented in the gearless mill drives currently operating at the Laguna Seca concentrator of Minera Escondida Ltda. The background of the new protection functions, related analysis and solutions are explained and experimental results are presented showing their operation.

The optimum operation was found after 3000 hours running. The capacity was some 10% over the guaranteed capacity. This large mill 17′ x 56′ is not less efficient than a smaller mill 10′ x 28′ used in comparative tests. Maintenance of "Gearless Drive" Mill. The lubrication system. This depended on gravity feed of oil to the bearing pads.

Gearless Mill Drive Optical Systems; Batch Ball And Rod Mills And Batch Drive Roll Net Weight 45 Lbs Rpm;, We can provide all elements of a mill drive system as double and triple reduction gearing available depending on the required ratio and motor, ABB's Gearless mill drive system is the most powerful mill drive system in the market.

Gearless mill drives (GMDs) constitute a compelling alternative to traditional ring-geared mill drives (RMDs) in such environments. Both drive types can be used to power large semi-autogenous (SAG), ball and autogenous mills, but GMDs are proven to offer superior availability, uptime and efficiency. When the first GMD was …

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the speed control system, behaves like a DC machine. The TRANSVEKTOR control system used on high-power mill drives has gone through a long development phase. A lot of experience has been gained with this system during the last 33 years. The first gearless drive with this control has been operating successfully for more than 30 years.

Ringmotor of the Gearless Mill Drive (GMD) System. CYCLOCONVERTER Principle The Cycloconverter is a frequency changer which converts a poly-phase voltage with the frequency f1 into a single or poly-phase voltage with a different, lower frequency f2. On Gearless Mill Drives (GMD), the operational output frequency varies from 0.3 Hz up to …

El sistema GMD Molino SAG (Semiautógeno) de 40 pies posee una potencia de 28 MW. Para alcanzar este requerimiento el SAG será equipado con el nuevo Cicloconvertidor ABB de 18 pulsos. ABB es una vez más el primero en presentar esta configuración tecnológica de punta para esta particular aplicación.

Our solution: SIMINE Gearless mill drives – outstanding reliability for your mine. The gearless concept. The gearless drive avoids any contact between the rotating mill and …

Technologies for extraction and processing, including gearless mill drives (GMDs) and gearless conveyor drives (GCDs), help operators save energy and achieve greater throughput at large mills with higher grinding …