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Slip Ring Motor MCQ [Free PDF] - Objective Question Answer ...

Rotor resistance starter: Rotor resistance starter is used in a high rating slip ring induction motor. It uses an external resistance/phase in the rotor circuit so that the rotor will develop a high value of torque. High torque is produced at low …

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Voltage Sag due to Induction motor starting – Voltage ...

S= slip which is the ratio of the difference between the synchronous speed (n s) and rotor speed (n m) to the synchronous speed. Slip = (n s – n m)/ n s. The core loss resistance and the magnetizing impedance of the motor will be much larger than the rotor impedance during starting condition and hence we can ignore it.

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'SER' – Slip Energy Recovery Grinding Mill Speed Control

An SER works with wound rotor induction drive motors, configured with LRS (Liquid Resistance Starting). ... With our SAG mill running at 65.4% critical speed …

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Starter of SAG Mills with rotor resistance

Starter of SAG Mills with rotor resistance. Q: For now I am working on a mining project which involves starting two SAG mills, the method of starting these mills is by rotor resistance and likewise we are using an energy recovery system (SER), could someone tell me how this system works SER? Each mills have two motors of 8000 kW at 13.8 kV.

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Used Sag Mill for sale. Hardinge equipment & more | Machinio

32 x 12 ft (9.8 x 3.7 m) Hardinge Koppers SAG Mill 6800 HP (5100 kW) Two GE wound rotor induction motors: - 3400 HP - 710 RPM - 4000 V - Includes motor starter. - Includes lube system and temperature sensors.

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CHAPTER 11

The Rotor The rotor contains the armature winding, which is the high-power winding of the DC machine. The slots in the lamination provide space for the armature coil. When operating as a generator, the armature winding is rotated through the field, generating a DC voltage that is delivered to the load. For motor operation, the armature winding

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Rotor Resistance Starters - BrainKart

ROTOR RESISTANCE STARTERS . o The easiest method of starting wound rotor (slip-ring) induction motors is to connect some extra resistance in the rotor circuit as shown in fig.. o Connection of extra resistance in the rotor circuit decreases the starting current and at the same time increases the starting torque.. o As the motor starts rotating the extra resistance is …

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Induction Motor Starting Methods - Bright Hub Engineering

Switching from start to run positions causing transient current, which can be greater in value than those obtained by DOL starting. 4. Rotor Resistance Starter. This starter is used with a wound rotor induction motor. It uses an external resistance/phase in the rotor circuit so that rotor will develop a high value of torque.

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Uneven SAG Mill Drive Power Draw - Grinding ...

Differences between drives power draw of two drives sag mills. In a double drive/pinion SAG, we face different power draw between each drives. ... to me this unequal load sharing would be apparent from start-up and would probably …

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Rotor resistance motor starter - YouTube

Slip Ring induction motorSpec10hp, 3 phase, 18A rated current, 1440rpm, TEFC, IP44, wound rotor

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All types of Motor Starter: Applications and Advantages ...

An electrical motor starter is a device or can be called a circuit which is to be connected in series with the motor to reduce the starting current and maintain the starting speed of the motor and also to protect the motor from overload, short circuit faults. DC Motor Starter, AC Motor Starter,Two-point Starter,Three-point Starter, Four-point Starter, Direct-on-line Starter or DOL Starter ...

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liquid starter for ball mill - pochiraju.co.in

LIQUID RESISTANCE STARTERS - NHP. their attention to liquid resistance starting of wound rotor motors. Applications. Suitable for use with heavy industrial machines such as; ball and SAG mills,. Get Price

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Ball Mills - an overview | ScienceDirect Topics

Oleg D. Neikov, in Handbook of Non-Ferrous Metal Powders, 2009 Tumbling Ball Mills. Tumbling ball mills or ball mills are most widely used in both wet and dry systems, in batch and continuous operations, and on a small and large scale.. Grinding elements in ball mills travel at different velocities. Therefore, collision force, direction and kinetic energy between two or more …

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MOTOR TECHNOLOGY Saving energy - TMEIC

• Grinding mills that require high torque at starting as they often sit with a full load of ... • One 10,000kW liquid resistance starter (rheostat) • One dual Slip Energy Recovery system (SPR drive). ... one of two wound rotor motors for a 10,000kW SAG mill ICR SEPTEMBER 2009.

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Gearless mill drives

• 28 MW GMD for a 40' SAG mill • 28 MW GMD for 42' SAG mill Whether it is size or an installation at the highest altitude (4600 m.a.s.l.), ABB's GMDs are well positioned to contribute to the building of larger and ever more powerful mills. — Leading the gearless mill drive evolution

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CSE Uniserve Product Overview

CSE Uniserve Liquid Resistance Starters ... • Designed for speed control of wound rotor induction motors. Typical application include mills, crushers, fans and pumps • Designed and manufactured in Europe to CSE Uniserve's specification for the ultimate in …

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Mill Safe Start MIII - SDG

Mill Safety Start System Mark III Mill Safe Start MIII o • Protecting the largest LRS-started mills since 2010. • Generation III Mill Safe Start: o Still the only proven real-time locked charge protection for grinding mills started with LRS. Extensive specialized rotor protection functions focused on grinding mills applications.

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Electromechanical Dynamic Behaviour and Start-Up ...

This paper presents a dynamic simulator of the electromechanical coupling start-up of a ball mill. The electromechanical coupling model based on the dynamic model of the ball mill, the characteristic equation of the clutch, and the dynamic model of the induction motor is established. Comparison between the simulation results of angular speed, load torque and current obtained …

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Starter of SAG Mills with rotor resistance

Starter of SAG Mills with rotor resistance Hi everybody, For now I am working on a mining project which involves starting two SAG mills, the method of starting these mills is by rotor resistance and likewise we are using an energy recovery system (SER), could someone tell me how this system works SER?

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Electrical Machines - Induction Machines - Standardization

Start behaviour of wound rotor machines can be controlled by adding resistance to the rotor circuit, as shown in Fig. 1: In the circuit model above, the actual resistance R E has been referred to the rotor as R′ E.It can be seen from the circuit model that the increased impedance will reduce the start current.

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LIQUID RESISTANCE STARTERS - NHP

Fixed electrode liquid resistance starters m350 sTArTer for use with low and medium voltage wound rotor motors from 200 kW to 750 kW, maximum rotor volts = 1500 V OVerVieW The M350 is a two stage liquid resistance starter, each stage replacing the equivalent of approximately five stages of fixed resistance.

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EPMA Liquid Resistance Starter - CSE Uniserve

The Australian-built market leading Unistarter EPMA Series liquid resistance starters offer the ultimate quality in starting large slip ring motors in mining, cement and water . ... Record rotor current waveforms ... Ball and SAG mills and cyclone feed pump .

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Benefits of continuous data acquisition from critical ...

start to work with Autogenous (AG), Semi- Autogenous (SAG) and Ball mills. Traditionally moved through a girth gear either with single or dual pinion, there are several variable speed drive trains alternatives in the market: a) using gearboxes attached to high speed Squirrel Cage (SC) motors with VFCs or Wound Rotor Induction

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Lrs And Ser For A Sag Mill, Ball Mill - Eurocentrum Bistro

Sag Mill Motor Stator. Sag mill sag is an acronym for semiautogenous grinding and applies to mills that utilize steel balls in addition to large rocks for grinding the sag mills use a minimal ball charge of 6 to 15 a rotating drum throws large rocks and steel balls in a cataracting motion which causes impact breakage of larger.

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Lrs Principle - Motor Starting - LMPForum

Share. Posted August 9, 2009. There are two ways a Liquid Resistance Starter can be used. 1) as a primary resistance starter where the resistance is connected in series with the stator of a standard squirrel cage motor and. 2) as a secondary resistance starter where the resistance is connected in series with the rotor of a wound rotor motor.

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(PDF) Evaluation of synchronous motors on grinding mills

Similar to the induction motor start, rotor resistance, ... Ball mills and SAG mills, vertica l grinding mills for raw or finishing sec tions all have a constant torq ue speed .

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Medium Voltage VSDs in mill drive applications

Two mills typically used are Ball Mills and SAG Mills which form part of the early stages of the recovery of various metals such as gold, platinum, uranium, copper and other ... starting resistance on the rotor of the slipring motor the full load cur- ... combination over medium voltage slipring motors using liquid resistance starters. It ...

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Liquid Resistance Starters GINO-AKA

type starter series, GINO-AKA provides a cost-effec-tive, reliable solution for the cement and industrial sector. For the minerals market, particularly for Ball and SAG Mills, GINO-AKA developed the MAK type starters with additional features for the specific de-mands. The robust design guarantees high operational relia-bility and long service life.

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Starting Methods of Synchronous Motor - your electrical guide

Where the starting torque is heavy, the motor is provided with a wound-rotor to be started as a slip-ring induction motor. The field is closed through resistance at the time of starting. It is connected to the DC source only when the motor has come up to the speed. The application of field current can be manual or automatic. Synchronous Motor ...