dual motor grinding mill drive synchronous motor

  • Load Sharing of Dual Motor Grinding Mill Drives IEEE

    Load Sharing of Dual Motor Grinding Mill Drives Abstract: Relatively small slowly varying shaft position and velocity variations superimposed on the normal running speed of dual Mining Grinding and Processing WEG,Grinding and processing. WEG offers the most reliable and efficient solutions for milling plants for ferrous and nonferrous products with their experience of mill drive systems.

  • Evaluation of synchronous motors on grinding mills

    2014417· This paper reviews various Mill drive configurations and improved synchronous motor characteristics when used with more advanced Current Source Load Sharing of Dual Motor Grinding Mill Drives IEEE Xplore,Load Sharing of Dual Motor Grinding Mill Drives Abstract: Relatively small slowly varying shaft position and velocity variations superimposed on the normal running speed of dual drive grinding mill motors can cause individual

  • Mining Grinding and Processing WEG

    The use of synchronous motors can also provide power factor correction with external field excitation; they can be designed with a high number of poles so without using large and expensive gearboxes they can reach rate speed when directly coupled to the mill pinion.Evaluation of synchronous motors on grinding mills,2014417· This paper reviews various Mill drive configurations and improved synchronous motor characteristics when used with more advanced Current Source Inverter (CSI) drives. It will also review the different synchronous motor excitation types and resulting performance characteristics with VFD control for new or retrofit installations.

  • TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS

    for the mill bearings, the mechanical mill brake control and the visualization of all parts of the drive system. Figure 1 shows a picture of a ringmotor used in copper concentrators. The poles of the rotor are directly mounted on the surface of the mill flange. Typically, the synchronous motors used in SAG mills have a power higher than 10 MW.Solutions for the Mining Industry TMEIC,Once the synchronous motor is started, the drive synchronizes the motor with the supply to operate directly across the line. As soon as the first mill motor is started and bypassed to the line, the drive is available to start the second mill. The same process is repeated to make the drive available for starting the third mill.

  • Evaluation of Synchronous Motors on Grinding Mills

    synchronous motors, VFD, CSI, VSI, LCI, efficiency, grinding mills, motor field excitation I. INTRODUCTION This paper concentrate on modern motor and drive solutions for single and dual pinionHow the Modern SER Drive boosts grinding ,It is the only mill controller with the ability to offer 100 per cent motor torque at hypersynchronous speeds for single or dual motor mills up to 22MW, an exclusive benefit no other technology can match. It also returns

  • Large AC Adjustable Speed Motors for Metals Rolling Mills

    Synchronous motors highstrength fi xing brace between the rotor coil of each salientpole to secure its position under all rolling conditions including frequent reversing operations. coilend connection capable of withstanding expansion and contraction movements of the rotor coil in the direction of the motor shaft. Induction motorsMill drive selection for semiautogenous grinding mills,to a gear drive with air clutches. motor, $1.28 million each 6000 Two secondary ac synchronized motors coupled to a gear mill, $2.5 million 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

  • LOW SPEED ASYNCHRONOUS MOTORS FOR MILL

    Synchronous motor cost is higher due to construction complexity, need for exciter and excitation panel, brushes, brush lifters. Figure 1 represents the equivalent circuit for a synchronous motor. voltage at what might be considered a “standard” value. Rather, both . Figure 1. Synchronous Motor Equivalent Circuit. Note the need for the fieldPaper machine drives Products (Pulp and paper) ABB,Paper machine drives system. ABB's Paper Machine Drive System PMC800 gives papermakers increased performance, greater energy savings and improved product quality. Whether the ABB drives are used on

  • CMP Paper 16.10.09 Final ABB

    Single and dual pinion configurations can be powered by low speed synchronous motors (approx. 160 200rpm) connected directly to the pinions driving the ring gear or by high speed asynchronous motors (approx. 750 1500 rpm) that require a reducer between the pinions and the motors.SAG Mill Components Mineral Processing & Metallurgy,418· If the advantages of a synchronous motor are desired on any dual pinion drive application, dual synchronous motors are available to drive dual pinion gear arrangements featuring load sharing control devices.

  • (PDF) Dynamic Analysis of SeriesConnected and ResearchGate

    422· Fig. 1: Two Synchronous Motor Mill drive. For such drive arrangements, it is important that the load on the girth gear is equally shared between the two motors. However, load imbalance.Mining Grinding and Processing WEG,The use of synchronous motors can also provide power factor correction with external field excitation; they can be designed with a high number of poles so without using large and expensive gearboxes they can reach rate speed when directly coupled to the mill pinion.

  • Evaluation of synchronous motors on grinding mills

    2014417· This paper reviews various Mill drive configurations and improved synchronous motor characteristics when used with more advanced Current Source Inverter (CSI) drives. It will also review the different synchronous motor excitation types and resulting performance characteristics with VFD control for new or retrofit installations.TECOWEsTinghOusE,In general, synchronous motors have less of a system voltage drop during startup than induction motors. Power factor improvement is one of the most attractive considerations in selecting a synchronous machine. Synchronous motors operate at leading power factors and are typically available with rated power factors ranging from unity to 0.80

  • TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS

    for the mill bearings, the mechanical mill brake control and the visualization of all parts of the drive system. Figure 1 shows a picture of a ringmotor used in copper concentrators. The poles of the rotor are directly mounted on the surface of the mill flange. Typically, the synchronous motors used in SAG mills have a power higher than 10 MW.Synchronous Motors on Grinding Mills: The Different Excitation ,93· Abstract: Synchronous motors (SMS) continue to be a viable alternative to induction motors because of efficiency advantages. Since SMs have long been used to provide leading kvar for power factor (PF) improvement and to help with the device switching in loadcommutated inverter (LCI) drives, these machines are efficient prime movers for

  • Evaluation of Synchronous Motors on Grinding Mills

    synchronous motors, VFD, CSI, VSI, LCI, efficiency, grinding mills, motor field excitation I. INTRODUCTION This paper concentrate on modern motor and drive solutions for single and dual pinionDesign and dynamic behavior of large Ring Motors for ,this synchronous motor consists of poles installed at a flange of the grinding mill. A closed air circuit cooling system limits the operating temperature to permitted values. Ring Motors vary the speed of the mill by changing the stator frequency. A cycloconverter provides variable frequency for start, stop and speed variation during operation.

  • Mill drive selection for semiautogenous grinding mills

    to a gear drive with air clutches. motor, $1.28 million each 6000 Two secondary ac synchronized motors coupled to a gear mill, $2.5 million 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 millionMotors for Metal Rolling Mills TMEIC,TMEIC designs and manufactures two types of AC solutions for this purpose. Salient pole synchronous motors that meet the high power and torque demands of a hot strip mill, as well as roughing and finishing stands. Excellent torque characteristics Superior efficiency Unit power factor Easy to control

  • LOW SPEED ASYNCHRONOUS MOTORS FOR MILL

    Synchronous motor cost is higher due to construction complexity, need for exciter and excitation panel, brushes, brush lifters. Figure 1 represents the equivalent circuit for a synchronous motor. voltage at what might be considered a “standard” value. Rather, both . Figure 1. Synchronous Motor Equivalent Circuit. Note the need for the fieldApplication of AC Induction Motors with Variable Frequency ,the synchronous speed of a 2pole motor is 3000 RPM, while an 8pole motor has a synchronous speed These motor and drive systems provide smoother starting, with lower amp draw, all with a lower priced motor. SPECIFYING AC INDUCTION MOTORS 1800 RPM and CHP 1800 1960 RPM, whereas a high pressure grinding mill motor

  • Paper machine drives Products (Pulp and paper) ABB

    At the core of the PMC800 drives: highperformance ABB‘s engineered ACS800 multidrives, M3 or M4 type motors and 800xA automation that stresses maintainability and energy efficiency. Design features include: High efficiency IGBT technology with the high performance DTC control High power density by small drive dimensions, liquid or air cooledSiemens Electric Motors SIMOTICS Drive Technology Global,SIMOTICS electric motors for industry. Quality and innovation from the very beginning: We cover the complete range of industrial motors synchronous as well as asynchronous: from standard electric motors through servomotors for motion control applications up to high voltage and DC motors. This is all based on more than 150 years of experience.

  • Technical Memorandum on Grinding Mill Motor Power

    224· The SAG mill power draw model of Austin (using the calibration by Doll, 2013) is used to predict the process power draw at the mill shell, P shell,and the efficiency losses for the drive's,