mill starting with slip ring

mill starting with slip ring

Suitable Starter for Ball Mill Starting Through Slipring ...

2011-6-25  06/23/2011 6:05 AM. Dear all, kindly suggest for a suitable starter to start a ball mill with 2600 kw, 1000 rpm, 11 kv slipring induction motor. has any latest invented to start the motor other than LRS FCMA. can the VVFD solution fullfil the initial torque compansation. the GD2 value of mill is around 400 kg m2.

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Starting of slip ring induction motor explained in an easy ...

2009-7-29  Low starting current when compared to squirrel cage induction motors, 3. Speed is varied with the help of external resistance, from 50% to 100% of the full speed, 4. Higher brush and slip ring maintenance required, 5. As the brush wears out, it may lead to intermittent contact, and thus heavy sparking. Thus we have seen in detail the starting ...

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ABB slip-ring modular motors - ABB high voltage

Slip-ring modular motors. NMK slip-ring motors are used in applications requiring high starting torque or low starting current. They are especially suitable for heavy load inertia applications like mill drives or situations where network conditions are weak. Slip-ring motors are built using proven standardized motor design, high-quality ...

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3 phase slip ring induction motors: 220 V - 13,800 V

The slip ring rotor chamber of the IC 411 slip ring induction motor is separated by what is known as a labyrinth seal, which prevents contamination from coal dust. The slip ring rotor chamber has two modification openings. This means that the state of the carbon brushes and the slip ring

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MILL DRIVES FOR CEMENT INDUSTRY TOPICS FOR

2014-1-2  C. Roller Mill Drives • High speed slip ring induction motor with rheostat • High speed low torque synchronous motor (Roller Lifters) • High speed high torque synchronous motor. (without roller lifter) October 29, 2006 7 D. GEARLESS BALL MILL DRIVE • For large mills, greater than 10’000 hp

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Liquid Resistance Rotor Starter – PIONEER ELECTRICAL

Pioneer Electrical Works, started manufacturing slipring motor starters, in a modest way, in 1967. Nearely a quarter century later, PIONEER has for the first time in india, manufactured 5000 kW liquid resistance slip ring motor rheostats.

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Three Phase Slip Ring Rotor Starter Control Power

Three Phase Slip Ring Rotor Starter Control Power Diagrams. Electrical Technology. 6 Less than a minute. 3 Phase Slip Ring Rotor Starter Control Power Diagrams. Abbreviations: O/L = Over Load Relay. NO = Normally Open.

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What are slip rings and why do some motors use them?

2018-8-21  Physically, a slip ring is a continuous ring, whereas a commutator is segmented. Functionally, slip rings provide a continuous transfer of power, signals, or data. Specifically, in AC motors, they transfer resistance to the rotor

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MAINTENANCE OF CARBON BRUSHES, BRUSH

2017-7-13  commutator / the slip rings with an “M” grade of grinding stone before commissioning. Cleaning z Remove as much dust as possible with a vacuum cleaner. Blow dry air though the rotor and the stator in both directions, i.e. commutator (or slip ring) side and opposite. Best practice is to blow the dust out of the machine and not through it.

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Electrolytic starter (LRS) for high power slipring motors ...

The level variation of electrolyte is pretty slow, which does not enable resistance to vary quickly enough for some specific applications (control of the slip for the ball mills for example). Why using a starter for slip ring motors. In order to start a slip ring motor, the accelerating torque has to be sufficiently higher than the resisting ...

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3 phase slip ring induction motors: 220 V - 13,800 V

The slip ring rotor chamber of the IC 411 slip ring induction motor is separated by what is known as a labyrinth seal, which prevents contamination from coal dust. The slip ring rotor chamber has two modification openings. This means that the

More

MILL DRIVES FOR CEMENT INDUSTRY TOPICS FOR

2014-1-2  C. Roller Mill Drives • High speed slip ring induction motor with rheostat • High speed low torque synchronous motor (Roller Lifters) • High speed high torque synchronous motor. (without roller lifter) October 29, 2006 7 D. GEARLESS BALL MILL DRIVE • For large mills, greater than 10’000 hp

More

Slip Ring Induction Motor - Construction, Speed Control ...

2019-9-10  These are used in increasing the starting torque of the motor. Slips rings are connected to the external high resistance circuit. The addition of these rings along with the external high resistance increases the resistance and decreases the inductive reactance. The function of a three-phase slip ring induction motor is shown in the figure below.

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Advantages and Disadvantages of Slip Ring Induction

2021-8-21  Hence slip ring motors are considered as variable speed motors. Slip ring motors have high over loading capacity, smooth acceleration under heavy loads, and no abnormal heating during starting; Disadvantages: Initial and maintenance cost is more compared to squirrel cage motor because presence of slip rings, brushes, short circuiting devices etc.

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Methods Of Starting Synchronous Motor Electrical ...

3. As a Slip Ring Induction Motor. The above method of starting synchronous motor as a squirrel cage induction motor does not provide high starting torque. So to achieve this, instead of shorting the damper winding, it is designed to a form a

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MAINTENANCE OF CARBON BRUSHES, BRUSH

2017-7-13  commutator / the slip rings with an “M” grade of grinding stone before commissioning. Cleaning z Remove as much dust as possible with a vacuum cleaner. Blow dry air though the rotor and the stator in both directions, i.e. commutator (or slip ring) side and opposite. Best practice is to blow the dust out of the machine and not through it.

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ELECTRICAL ENGINEERING IMPORTANT MCQ-INDUSTRIAL

2016-10-28  (d) Slip ring induction motor Ans: c. 46. In case of _____ speed control by injecting e.m.f. in the rotor circuit is possible, (a) d.c. shunt motor (b) schrage motor (c) synchronous motor (d) slip ring induction motor Ans: d. 47. A pony motor is used for the starting which of the following motors ? (a) Squirel cage induction motor

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300+ TOP INDUSTRIAL DRIVES Objective Questions and

(a) Slip ring induction motor (b) Synchronous motor (c) D.C. shunt motor (d) Schrage motor Answer: b. 45. has the least value of starting torque to full load torque ratio. (a) D.C. shunt motor (b) D.C. series motor (c) Squirrel cage induction motor (d) Slip ring induction motor Answer: c. 46.

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A BASIC UNDERSTANDING OF THE MECHANICS OF

2003-10-15  on wear is another issue. Stresses from Hertzian pressure in 4-high cold mill back up rolls were measured years ago, the results were never published, but of high interest - also, maybe later. K. H. Schröder July 2003 K. H. Schröder: A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS File: SCHROEDER_ROLLS_010703.DOC

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Methods Of Starting A Slip Ring Motor - MOFLON

A slip motor can be started by two different methods - the first method is called the current limiting method. The second method employed for starting of slip ring follows the modern slip ring and it is known as the definite time

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MILL DRIVES FOR CEMENT INDUSTRY TOPICS FOR

2014-1-2  C. Roller Mill Drives • High speed slip ring induction motor with rheostat • High speed low torque synchronous motor (Roller Lifters) • High speed high torque synchronous motor. (without roller lifter) October 29, 2006 7 D. GEARLESS BALL MILL DRIVE • For large mills, greater than 10’000 hp

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Wind Turbine Slip Rings - Moog Inc.

2021-9-25  Moog offers a WP7129 direct replacement pitch control slip ring for the NEG Micon NM72 / 82 wind turbines. Moog’s unit mounts directly to the gearbox with a through passage for the hydraulic lines and wiring. Moog offers a WP7286 direct replacement pitch control slip ring

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What are slip rings and why do some motors use them?

2018-8-21  Physically, a slip ring is a continuous ring, whereas a commutator is segmented. Functionally, slip rings provide a continuous transfer of power, signals, or data. Specifically, in AC motors, they transfer resistance to the rotor

More

Slip Ring Induction Motor - Construction, Speed Control ...

2019-9-10  These are used in increasing the starting torque of the motor. Slips rings are connected to the external high resistance circuit. The addition of these rings along with the external high resistance increases the resistance and decreases the inductive reactance. The function of a three-phase slip ring induction motor is shown in the figure below.

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Starting methods of three phase induction motors ...

2021-5-5  Slip-ring motors are started with full line voltage, as external resistance can be easily added in the rotor circuit with the help of slip-rings. A star connected rheostat is connected in series with the rotor via slip-rings as shown in the fig. Introducing resistance in rotor current will decrease the starting

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Know how to control the speed of slip ring motors - Bright ...

2009-7-31  The external rheostat which is used for the starting purpose of these slip ring motors can be used for its speed control too. But the point to look into is the starting rheostat must be rated for “continuous” operation. We have already discussed about the rheostat starting of slip ring motors

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Advantages and Disadvantages of Slip Ring Induction

2021-8-21  Hence slip ring motors are considered as variable speed motors. Slip ring motors have high over loading capacity, smooth acceleration under heavy loads, and no abnormal heating during starting; Disadvantages: Initial and maintenance cost is more compared to squirrel cage motor because presence of slip rings, brushes, short circuiting devices etc.

More

Difference Between Slip Ring Squirrel Cage Induction ...

The starting torque of the slip-ring motor is high, whereas in squirrel cage motor it is low. The maintenance cost of the slip ring motor is high as compared to squirrel cage motor because the slip ring motor consists brushes and rings. The copper loss is more in slip ring

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A BASIC UNDERSTANDING OF THE MECHANICS OF

2003-10-15  on wear is another issue. Stresses from Hertzian pressure in 4-high cold mill back up rolls were measured years ago, the results were never published, but of high interest - also, maybe later. K. H. Schröder July 2003 K. H. Schröder: A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS File: SCHROEDER_ROLLS_010703.DOC

More