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The arrival of Siemens low speed dual-pinion mill drives ...

07/02/2017  The arrival of Siemens low speed dual-pinion mill drives at Collahuasi Copper Mine, Chile. Watch later.

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Ball Mill Drives - 911 Metallurgist

22/10/2016  Motor speeds should be between 580 and 1160 rpm. The lower speeds apply to large diameter mills, the higher speeds to the smaller. DIRECT CONNECTED Ball Mill DRIVE. When power exceeds 300 HP a direct connected drive is recommended. This drive is also applicable for lower power requirements if desired. Synchronous motors are preferred, but in some cases wound rotor motors

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SAG Mill Variable Speed Drive - 911metallurgist

18/07/2018  For power requirements up to approximately 4,476 kW (6,000 hp), it is convenient to drive the mill through a ring gear and single pinion arrangement. The pinion is driven by a low speed brushless synchronous motor driving through an air clutch.

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Siemens: Fast delivery of the low speed dual-pinion mill ...

07/02/2017  The arrival of the low speed dual-pinion mill drives for Collahuasi Copper Mine, Chile Siemens Mining industry... Logistic challenge: New stage goal.

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Drive Systems Metal Solutions GE Power Conversion

Low Voltage and Medium Voltage AC variable speed drives. GE's latest range of MV7000 Medium Voltage drives (power range up to 81 MW) is based on a modern IGBT device. This provides excellent control of motor speed, torque, and power and responds rapidly to changes in load, speed and torque commands. MV7000 is a leading solution across a wide range of Metals applications. It is designed to meet GE customers’ expectations for power quality, quality output, efficiency, reliability, low ...

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Powerful Performance. Flexible Control.

FORCE™ Technology, is the original Allen-Bradley patented field-oriented Control that provides excellent low speed/zero speed performance and delivers accurate torque and speed regulation. PowerFlex 755T drives offer TotalFORCE® Technology that builds on the original FORCE technology to deliver superior motor control through

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Drive Systems Metal Solutions GE Power Conversion

Low Voltage and Medium Voltage AC variable speed drives. GE's latest range of MV7000 Medium Voltage drives (power range up to 81 MW) is based on a modern IGBT device. This provides excellent control of motor speed, torque, and power and responds rapidly to changes in load, speed and torque commands. MV7000 is a leading solution across a wide ...

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Medium Voltage Drives SINAMICS Electric Drives -

Together, the drives’ variable speed capability and Advanced Cell Bypass technology allowed the mine to maximize throughput while maintaining motor efficiency. After installing the SINAMICS PERFECT HARMONY VFD on their ball mill applications, the mine owners saw such improvement in their process — and profits! — that they went on to install the drive on three additional applications as well.

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ABB in Mining

Gearless Mill Drives - Increased process availability, reliability and energy efficiency (English - png - Drawing) Underground mine automation illustration (English - pdf - Drawing) Ring-geared low speed dual pinion (English - pdf - Drawing) Ring-geared mill drive high speed single pinion (English - pdf - Drawing)

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MV7000 Medium Voltage Drives GE Power Conversion

MV7000 drives can feed both induction and synchronous machines with high performance vector control across all speed ranges. For multiple drive applications with both motoring and regenerating drives, a common DC link fed by a single active front end can reduce overall equipment cost and footprint. Our Medium Voltage drives family. The MV7000 is part of GE’s medium voltage drive family which ...

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Powerful Performance. Flexible Control.

PowerFlex Low Voltage Drives Powerful Performance. Flexible Control. 2 Rockwell Automation Publication PFLEX-SG002N-EN-P - February 2021 PowerFlex Low Voltage Drives Selection Guide What’s Inside What’s New Corrosive Gas Protection Facilities with corrosive gases are constantly addressing the threat of early equipment failure and have had very few options to combat this, until

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The Inside of a Wind Turbine Department of Energy

Drives the generator. Low-speed shaft: Turns the low-speed shaft at about 30-60 rpm. Nacelle: Sits atop the tower and contains the gear box, low- and high-speed shafts, generator, controller, and brake. Some nacelles are large enough for a helicopter to land on. Pitch: Turns (or pitches) blades out of the wind to control the rotor speed, and to keep the rotor from turning in winds that are too ...

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Products TMEIC

Low Voltage AC Drives. TMEIC offers Low-Voltage AC Drives, including the TMdrive-10e2 and the TMdrive-10SPR (Slip Power Recovery). Learn More. DC Drives. The TMdrive-DC from TMEIC is a family of DC system drives for new and retrofit applications. Learn More. PV Inverters. TMEIC's PV Inverters improve the efficiency and reliability of electric power supply systems using power conversion ...

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100 Most Important MCQ on Electric Drive Industrial ...

27/02/2021  Systems employed for motion control are called drives and may employ any of the prime movers. ... Low Noise; Constant speed; All of the above; Show Explanation. Answer 1. High Efficiency. Explanation:- Advantages of Group driver electric drive. Saving in the initial cost: One 150 kW motor costs much less than ten 15 kW motors required to drive 10 separate machined. High Efficiency:-The ...

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What is the reason causes motor ... - Variable Speed Drives

Most of variable speed drives are applying on high temperature fans, kiln head coal mill fans, kiln head surplus fans, raw mill circulating fans and so on. Two production lines ... Variable speed drive for ID Fans in mining industry. Variable speed drive application in purification system optimizes the system performance, improves purification effect, reduces power consumption greatly ...

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What's the minimum frequency (speed) can a VFD run?

03/12/2014  It is actually a low frequency of a fraction of a Hertz, to several Hz - depending on the size of the motor (VFD) and its rated slip. The choice of frequency is a compromise between effective induction on the rotor, and minimum magnetizing current (higher frequency) - and operation in the right part of the (reduced starting frequency) torque-speed curve (lower frequency is preferred). A ...

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LOW SPEED ASYNCHRONOUS MOTORS FOR MILL APPLICATIONS

LOW SPEED ASYNCHRONOUS MOTORS FOR MILL APPLICATIONS . V. Matthews, Siemens Process Industries Drives, Alpharetta GA . INTRODUCTION Typical grinding electrification requirements are defined by high power, constant torque and slow speed. Dual pinion mills also include a need for tight tolerances in torque between the two motors, to avoid overloading any single motor.

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Medium Voltage Drives SINAMICS Electric Drives -

Together, the drives’ variable speed capability and Advanced Cell Bypass technology allowed the mine to maximize throughput while maintaining motor efficiency. After installing the SINAMICS PERFECT HARMONY VFD on their ball mill applications, the mine owners saw such improvement in their process — and profits! — that they went on to install the drive on three additional applications as well.

More

MV7000 Medium Voltage Drives GE Power Conversion

MV7000 drives can feed both induction and synchronous machines with high performance vector control across all speed ranges. For multiple drive applications with both motoring and regenerating drives, a common DC link fed by a single active front end can reduce overall equipment cost and footprint. Our Medium Voltage drives family. The MV7000 is part of GE’s medium voltage drive family which ...

More

Cycloconverter - an overview ScienceDirect Topics

Cycloconverter-fed synchronous motors are well suited for low-speed drives with high torque at standstill, and high-capacity gear-less cement mills (tube or ball mill above 5 MW) have been the first applications of these drives.

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Engineering Info - MasterDrives

Ratio High Speed Low Speed Ratio = RPM High RPM Low RPM Feet per Minute of Belt RPM = FPM and Pulley Diameter .262 x diameter in inches Belt Speed Feet per Minute RPM Pulley Diameter FPM = .262 x RPM x diameter in inches Ratio Teeth of Pinion Teeth of Gear Ratio = Teeth of Gear Teeth of Pinion Ratio Two Sprockets or Pulley Diameters Ratio = Diameter Driven Diameter Driver 3. Force -

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Products TMEIC

Low Voltage AC Drives. TMEIC offers Low-Voltage AC Drives, including the TMdrive-10e2 and the TMdrive-10SPR (Slip Power Recovery). Learn More. DC Drives. The TMdrive-DC from TMEIC is a family of DC system drives for new and retrofit applications. Learn More. PV Inverters. TMEIC's PV Inverters improve the efficiency and reliability of electric power supply systems using power conversion ...

More

Constant Torque Variable Frequency ... - Drives Systems

15/01/2015  Variable-speed drives can also run a motor in specialized patterns to further minimize mechanical and electrical stress. For example, an S-curve pattern can be applied to a conveyor application for smoother deceleration and acceleration control, which reduces the backlash that can occur when a conveyor is accelerating or decelerating.

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What is the reason causes motor ... - Variable Speed Drives

Most of variable speed drives are applying on high temperature fans, kiln head coal mill fans, kiln head surplus fans, raw mill circulating fans and so on. Two production lines ... Variable speed drive for ID Fans in mining industry. Variable speed drive application in purification system optimizes the system performance, improves purification effect, reduces power consumption greatly ...

More

What's the minimum frequency (speed) can a VFD run?

03/12/2014  It is actually a low frequency of a fraction of a Hertz, to several Hz - depending on the size of the motor (VFD) and its rated slip. The choice of frequency is a compromise between effective induction on the rotor, and minimum magnetizing current (higher frequency) - and operation in the right part of the (reduced starting frequency) torque-speed curve (lower frequency is preferred). A ...

More

Do VFDs really improve the power factor of AC motors?

07/12/2018  Variable frequency drives typically have very high PF D values. This is because the DC bus capacitors supply the necessary reactive current to the motor for inducing the rotor’s magnetic field, and the AC supply line only has to supply real power. This means voltage and current remain almost perfectly in phase, with very little displacement, and the power factor can be at or near unity.

More

LOW SPEED ASYNCHRONOUS MOTORS FOR MILL APPLICATIONS

LOW SPEED ASYNCHRONOUS MOTORS FOR MILL APPLICATIONS . V. Matthews, Siemens Process Industries Drives, Alpharetta GA . INTRODUCTION Typical grinding electrification requirements are defined by high power, constant torque and slow speed. Dual pinion mills also include a need for tight tolerances in torque between the two motors, to avoid overloading any single motor.

More

ABB drives in metals Medium voltage drives for improved ...

the rolling mill process with ABB drives, customers in the metals industry are able to optimize production, minimize wear, ... range even at very low speeds. Optionally, the ARU can be dimensioned to compensate reactive power generated by other loads connected to the same network. Network friendly For applications where high power is required, ARU modules can be connected in parallel. The ...

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Cycloconverter - an overview ScienceDirect Topics

Cycloconverter-fed synchronous motors are well suited for low-speed drives with high torque at standstill, and high-capacity gear-less cement mills (tube or ball mill above 5 MW) have been the first applications of these drives.

More

Engineering Info - MasterDrives

Ratio High Speed Low Speed Ratio = RPM High RPM Low RPM Feet per Minute of Belt RPM = FPM and Pulley Diameter .262 x diameter in inches Belt Speed Feet per Minute RPM Pulley Diameter FPM = .262 x RPM x diameter in inches Ratio Teeth of Pinion Teeth of Gear Ratio = Teeth of Gear Teeth of Pinion Ratio Two Sprockets or Pulley Diameters Ratio = Diameter Driven Diameter Driver 3. Force -

More

Products TMEIC

Low Voltage AC Drives. TMEIC offers Low-Voltage AC Drives, including the TMdrive-10e2 and the TMdrive-10SPR (Slip Power Recovery). Learn More. DC Drives. The TMdrive-DC from TMEIC is a family of DC system drives for new and retrofit applications. Learn More. PV Inverters. TMEIC's PV Inverters improve the efficiency and reliability of electric power supply systems using power conversion ...

More

Understanding Variable Speed Drives (Part 1) ECM

01/03/1999  Understanding Variable Speed Drives (Part 1) Operating a motor at the outer limits of its voltage requirements reduces its efficiency and causes premature failure. Three basic types of variable frequency drives offer certain advantages as well as disadvantages depending on your motor application. The new flux vector drive is also discussed.

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Gearbox Manufacturers USA Precision Gearbox

Ondrives.US’ rack and pinion actuator gear drives convert rotational motion into linear motion, or vice versa. Our compact designs provide short strokes from 10mm to 30mm. Planetary Motorized Gearboxes. Our motorized planetary reducers are small, inline devices designed for low backlash performance in speeds up to 3,000 RPM. Slim, compact footprints make them ideal for applications

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What is the reason causes motor ... - Variable Speed Drives

Most of variable speed drives are applying on high temperature fans, kiln head coal mill fans, kiln head surplus fans, raw mill circulating fans and so on. Two production lines ... Variable speed drive for ID Fans in mining industry. Variable speed drive application in purification system optimizes the system performance, improves purification effect, reduces power consumption greatly ...

More

Difference between V/F control and vector control ...

24/11/2013  If you try to run at those low speeds with a V/Hz drive, you will typically see the motor shaft "cogging" as it tries to turn. Vector Control:- 1. Vector drives can separately manipulate the voltage and frequency to always produce the optimum V/Hz ratio for maximum torque. In this way, vector drives can generate more starting torque, and can provide full torque down to 1 Hz or less, while V/Hz ...

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Do VFDs really improve the power factor of AC motors?

07/12/2018  Variable frequency drives typically have very high PF D values. This is because the DC bus capacitors supply the necessary reactive current to the motor for inducing the rotor’s magnetic field, and the AC supply line only has to supply real power. This means voltage and current remain almost perfectly in phase, with very little displacement, and the power factor can be at or near unity.

More