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(PDF) Evaluation of synchronous motors on grinding mills

This paper concentrate s on modern motor and drive solutions for s ingle and dual pinion of Grinding Mill Motors and . Drives is a synchronous drive of grinding ball mills 4 MW, 150 rpm, 6

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Paper # 25 Copper Mountain Overview on the Grinding

Mill type Wet grinding, overflow discharge Mill drive motor size 17,000 HP Mill drive motor type Synchronous 200 RPM Inside diameter 7,315 mm Length 11,430 mm Effective grinding length (EGL) 11,886 mm Bearing type Partial Journal, 120 degree bronze insert Bearing size 3,200 mm diameter by 710 mm wide Bearing material Bronze

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Load Sharing of Dual Motor Grinding Mill Drives IEEE

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 motor torque variations which disturb load sharing. The magnitude of load or torque unbalance is a function of the magnitude of the mechanical variation, the type of motors used, i.e., induction or synchronous, the

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Evaluation of synchronous motors on grinding mills IEEE

Apr 17, 2014 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.

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Drive Solutions for the Global Mining Industry

All three grinding mills are driven by synchronous motors of identical ratings. One drive can start any of the three motors in any desired sequence as shown by the blue lines in the fi gure above. Once the synchronous motor is started, the drive synchronizes the motor with the supply to

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Load Sharing of Dual Motor Grinding Mill Drives

Relatively small slowly varying shaft position and velocity variations superimposed on the normal running speed of dual drive grinding mill motors can cause individual motor torque variations which disturb load sharing. The magnitude of load or torque unbalance is a function of the magnitude of the mechanical variation, the type of motors used, i.e., induction or synchronous, the number of

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Mill drive selection for semiautogenous grinding mills

the SAG mill with the dc drive. The ac synchronous motors used in the gear and gearless drives have a higher efficiency than the dc drive. Thus: for large motor horsepowers, the efficiency would affect the operating cost of the operation. Typically, the overall drive efficiency when using an ac synchro-nous motor is 92~0, whereas the equiva-

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Design 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 sys-tem limits the operating temperature to permitted values. Ring Motors vary the speed of the mill by changing the sta-tor frequency. A cycloconverter provides variable frequency for start, stop and speed variation during operation.

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Synchronous Motors Electric machine

Synchronous motors have a unique and merited position as the most efficient electrical drive in the industry and are often 1-2% more efficient than induction motors. Power Factor Correction Synchronous motors can operate at leading power factors, providing VARs to the power system, reducing demand charges often caused by induction motors.

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[randpic] (PDF) Evaluation of synchronous motors on grinding mills This paper concentrate s on modern motor and drive solutions for s ingle and du

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