LSSM = Low Speed Synchronous Motor Drive …

A high speed motor can run at 900 RPM and uses a gearbox to turn down the speed. A medium speed motor runs in the range of 100 RPM and uses the gear ratio of the pinion and mill ring-gear to …

Increasing availability through advanced Gearless Drive …

Mill speed can be adapted to upstream and downstream processes – avoids overgrinding, and optimizes load distribution between SAG and ball mill (Mular, Halbe & Barratt, 2002). Power consumption is influenced by load respectively torque and mill speed. This means that further energy can be saved if a mill speed below the rate speed is re-

Synchronous Motor: Features, Applications, Advantages and Disadvantages

The speed of a synchronous motor is independent of load. Synchronous motors are not inherently self-starting. Some auxiliary means have to be provided for starting. ... rotary kilns and variable-speed ball mills, etc. Some industrial applications of synchronous motors are such as high power and high speed compressors, blowers, …

Mill drive selection for semiautogenous grinding mills

ball mills, 18x27 drive with an air clutch, motor, $602,000 6050 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 ...

Explosion-Proof Permanent Magnet Synchronous Motor with Variable

Explosion-Proof Permanent Magnet Synchronous Motor with Variable Frequency Speed Drive 2 in 1 for Mine, Find Details and Price about Ball Mill Miner Motor Water Pump Motor from Explosion-Proof Permanent Magnet Synchronous Motor with Variable Frequency Speed Drive 2 in 1 for Mine - Xinda Green Energy Co., Limited ...

Synchronous Motor: Construction, Working, and Applications

VFD is used to control the speed of the synchronous motor. Its speed is independent of the load. Therefore synchronous motor is not affected by any variation in the load. The Increase in load increase the torque. A synchronous motor will stall if the torque increase beyond the breakdown torque. Synchronous motor either run at synchronous speed ...

LCI'S AND SYNCHRONOUS MOTORS APPLIED TO …

4.3 Synchronous Motor Salient pole synchronous motors pose another unique set of characteristics. These motors get their rotor excitation from a separate source and can, therefore, operate at synchronous speed. The typical synchronous motor has a speed torque curve shown in Figure 4.

Commissioning Variable Speed SAG Mill Gearless Drive

Each SAG primary mill (Boliden-Allis) operates with two 5.000 HP. Ball Mills as secondary grinding stage. The Electric Drive (SIEMENS) consists a 11.000 HP synchronous motor of variable speed. General Description of the Drive. The SAG Mill Drive is mainly formed by a 11,000 HP. Ring Type Synchronous Motor of double …

Ball Mill Positioning

synchronous motor to start as a typical induction motor. During starting when the motor is near full speed, the DC field excitation is then applied and the motor synchronizes. Once synchronized the motor operates as a synchronous motor at its rated speed. As the mill rotates and grinds the clinker, the balls are eroded and the liner is damaged ...

1 x SAG Mill & Siemens Motor

Mill Details (2 x Ball Mills & 4 x GE Motors, Type of Mill Ball Mill Mill Dimensions 6,706 mm x 11,125 mm (22' x 36.5') (D x L) Mill Speed 12.44 RPM Liners Excluded Mill Drive Motor Type Dual Pinion Synchronous (2 Motors per Mill) Mill Drive Motor Size 2 x 4,650 kW min = 9,300kW per mill Variable Speed Drive No Max. Volumetric Load 45%

BROCHURE Synchronous motors High performance in …

speed delivers clear benefits. Rolling mills, mine hoists, pumps and compressors are typical examples of variable speed applications. Synchronous motors with variable speed drives (VSDs) are also commonly used in the main propulsion system in ships. Optimized electrical drive systems with variable speed motors can also provide …

BALL MILL DRIVE MOTOR CHOICES

Drive 5 - A 5000 HP, 1200 rpm synchronous - induction motor with liquid rheostat and dc field excitation to a dual pinion gear driven mill. For the power supply in this study, four …

The engineering and process effects of choosing a …

Many grinding mill owners choose a variable speed drive for their mill to cope with variations in ore hardness, plant throughput and other process considerations. Two important engineering decisions that owners must make before purchasing a variable speed drive system are the selection of the motor nominal design speed and the motor …

VFD Ball Mill Solutions

Working with a long time customer and local partner in the motor controls industry, Benshaw was able to solve this problem by applying a 480VAC 700HP AC variable frequency drive. The Benshaw VFD powers the 4160 volt – 3500HP synchronous ball mill motor during positioning to smoothly rotate the ball mill and bring it to the …

GE Motor Technology to Drive Mexico's Largest Ball Mill …

Variable Speed Motors

The synchronous motor platform ranges from 1 to 70 MW in both fixed and variable speed designs. Voltages range from 1kV - 70kV and all major enclosures are available including: WPII (IC01), TEAAC (IC611), and TEWAC (IC81W). ... (twin drive), SAG mills, ball mills; Hoists & blowers; Refiners & wind tunnel motors; California Transparency in ...

LOW SPEED ASYNCHRONOUS MOTORS FOR MILL …

Variable speed application for grinding is most commonly applied to the SAG mill circuit due to the need to accommodate ore of variable hardness arriving from the mine. Ball Mills tend to operate at constant speed however AFDs areincreasingly applied to the Ball Mill circuit to reduce start-up current, eliminate the gearbox, and optimize energy

Elom-TDMK high torque ball mill synchronous motor

TDMK high voltage synchronous motors special design for mill machines such as ball mill motor, steel rolling mill motor, paper mill motor, this series motors are high starting torque, high inertia requirement, with high efficiency and stable performance

Milling

concerned, did not require variable speed. However, frequency converter based drive systems provide benefits that improve the ball mill operation. FIXED SPEED CONFIGURATIONS The key issue to operate a mill in a fix speed mode is the starting. A squirrel-cage motor or a synchronous motor started direct on line

GE Motor Technology to Drive Mexico's Largest Ball Mill …

The site is Latin America's largest ball mill operation. Grupo Mexico will use GE's advanced synchronous motor technology to add 84 megawatts (MW) of power at six Buenavista ball mills.

Mining

WEG can offer a complete mill driving system for applications that require reliability, high availability, easy configuration and system updates such as the input switchboard, dry …

Mining

Constant speed. Low speed synchronous motors. Synchronous motors are widely used in mill driving systems at a constant speed using an air clutch between the motor shaft and mill p

TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS …

SAG mills have a power higher than 10 MW. Even ball mills have a power larger than 10 MW. For this reason, they have an important impact in energy consumption and in the operation of the power distribution system. Figure 1. Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed synchronous ...

14. Variable Frequency Synchronous Motor Drives

Variable Frequency Synchronous Motor Drives • Large, low speed reversing drives, such as needed for gear-less rolling mills or mine hoists, with stringent requirements for high dynamic performance. In the past, these were mainly DC motors but they can now be built as AC synchronous motors supplied by cycloconverters, thereby eliminating

Ball Mill (Ball Mills Explained)

The motor is usually fitted with a variable speed drive (VSD) to control the rpm of the ball mill. Gearbox – used for speed reduction from the motor to the ball mill. Balls – usually manufactured from manganese alloy steel, but the material depends upon for what material the mill will grind ( chrome steel alloy and rubber also available).

Large AC Adjustable Speed Motors for Metals Rolling …

TMEIC2 installed its first AC adjustable-speed motor drive system for a rolling mill main stand in 1980; by January 2004 TMEIC had installed AC adjustable- ... tension range aluminum foil mills. 2. Synchronous or induction motor solutions, fed from either a voltage source inverter (such as IEGT, GCT or IGBT) or cycloconverter.

Increasing availability through advanced Gearless Drive …

Synchronous

With all of the advancements made in adjustable frequency drive technology, the variable speed synchronous motor is a logical choice for applications requiring high torque at low speed with a high-speed range. Applications: Rolling, Ball and Sag Mills; Chippers; Mixers; Pulp Refiners; Pumps; Fans; Compressors; Specialty Applications

STEPPING FORWARD: USING VARIABLE SPEED DRIVES …

Variable Speed, Variable Speed Drive, Semi-autogenous mill, Ball mill, efficiency, drive system. INTRODUCTION. Comminution circuits for mining have evolved from basic …

LV Ball Mill Solutions

Working with a long time customer and local Benshaw partner in the motor controls industry, Benshaw has successfully applied a 480VAC 700 HP AC variable frequency drive for positioning a medium voltage synchronous motor driven ball mill. The variable frequency drive powers the 4160Volt – 3500HP synchronous ball mill motor during …