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ball mill starting with slip ring motors and liquid rheostat

2020-07-18T21:07:44+00:00
  • Wound Rotor Induction Motor with Liquid Rheostat Arcing ...

    9/18/2011  Hi, We operate ball mills with dual-coupled 3500hp 4160v wound rotor induction motors. We have recently experienced frequent arcing of the slip rings which seem Wound Rotor Induction Motor with Liquid Rheostat Arcing Slip Rings - Electric motors generators engineering - Eng-Tips

  • Liquid starter : Liquid rheostat Electrolytic Starter ...

    Electrolytic starters, liquid rheostat, specially designed by AKA AUTOMATION offers optimum starting performance. ... Liquid starter for slip ring motors 30kW - 700kW. Find out more; Read the features sheet; GINO-AKA. ZAC du bois Chaland. 15 rue des Pyrénées, 91090 LISSES

  • Liquid rheostat - Wikipedia

    OverviewDescriptionAdvantages and disadvantagesUsesCurrent useSafety issues with older designsA liquid rheostat or water rheostat or salt water rheostat is a type of variable resistor. This may be used as a dummy load or as a starting resistor for large slip ring motors. In the simplest form it consists of a tank containing brine or other electrolyte solution, in which electrodes are submerged to create an electrical load. The electrodes may be raised or lowered into the liquid to respectively decrease or increase the electrical resistance of the load. To stabilize the load, the mixture
  • liquid rotor starter for large slip ring induction motors ...

    ball mill starting with slip ring motors and liquid . Starting of slip ring induction motor explained in an easy manner. A Slip Ring induction motor can be started with external resistance added in its ... be a form of rheostat, connected in star, thus kept at maximum when the motor starts .... slip ring motor by 200kw Variable Frequency Drive ...

  • Ball Mills Liquid

    Ball Mill Starting With Slip Ring Motors And Liquid. Ball mill drive motor choices Artec Machine Systems. ball mills the starting torque restrictions of some of the newer mill drive In more recent times the wound rotor motor with the liquid rheostat has come into use in .. this maintenance especially the maintenance of the slip rings and brushes.

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

    A Slip Ring induction motor can be started with external resistance added in its rotor circuit. But how does external resistance aid in better starting characteristics? Read here to know about the starting arrangement and the role played by the external resistances in obtaining better starting characteristics. Also know about the qualities of slip ring induction motors.

  • liquid starter for grinding mill motor - Popular Education

    Flexible Slip Energy Recovery Drive - Siemens. For example, the mill speed can be increased to reach the best grinding results ... Additionally, the system of slip-ring motors (WRIM) and ... SAG mills and ball mills in the mining industry, where ... liquid starter ... Startup with rotor starter. Read More

  • Mining - Grinding and Processing WEG

    Induction motors. For ball and SAG /AG mills with a single or double pinion, motors with squirrel cage rotor are normally used when constant speed and low starting current are required. ... for maintenance. In a speed variation range, slip energy recovery systems can be used together with the traditional starting system (liquid rheostat) aiming ...

  • Current on rotor connected to rheostat Mike Holt's Forum

    12/22/2009  This liquid Rheostat is a Salt Water Rheostat and is controlling the rotor on a 6500HP Ball Mill Motor. I thought there was both voltage and current on the Rheostat when up to full speed. Thanks for the confirmation.

  • Liquid Resistance Rotor Starter - Pioneer Electrical Works

    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.

  • 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 ...

  • Mining - Grinding and Processing WEG

    Variable Speed . Single or double pinion driving systems. Designed to drive and control the speed of the medium voltage motors coupled to the SAG/AG, ball and HPGR mills with single or double pinion, the MVW01 frequency drive uses state of the art technology through a multilevel structure with medium voltage IGBTs, reducing the harmonic currents on the motor to extremely low levels.

  • LIQUID RESISTANCE STARTERS - NHP Electrical

    draw, a wound rotor (or slip ring) motor can provide unparalleled starting performance. NHP offers a range of Australian made and industry proven fixed and moving electrode liquid resistance starters for use with low and medium voltage wound rotor motors from 200 kW to 12.4 MW. 2

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

    A Slip Ring induction motor can be started with external resistance added in its rotor circuit. But how does external resistance aid in better starting characteristics? Read here to know about the starting arrangement and the role played by the external resistances in obtaining better starting characteristics. Also know about the qualities of slip ring induction motors.

  • Current on rotor connected to rheostat Mike Holt's Forum

    12/22/2009  This liquid Rheostat is a Salt Water Rheostat and is controlling the rotor on a 6500HP Ball Mill Motor. I thought there was both voltage and current on the Rheostat when up to full speed. Thanks for the confirmation.

  • High voltage motors for mills More for mining

    Slip-ring motors are induction motors with a wound rotor solution. They are available up to powers of 18 MW and represent a good choice for installations in remote areas or with high starting torque requirements. A liquid rheostat is used for starting. ABB’s motors represent a robust, safe and energy efficient solution for energy-intensive ...

  • Liquid starter - Electric motors generators engineering ...

    7/31/2003  I've got a 500kW, 6.6kV slip ring induction motor, which uses a liquid starter to bring it up to speed and is then switched to synchronous operation. ... The motor drives a cement ball mill, and the operator is blaming the starter but I think that if it is not accelerating as it used to then the load has increased. ... Go to the "Search" bar at ...

  • What is a liquid resistance starter?where it is used??

    lrs is used in applications where high starting torque is required with minimal current. in slip ring motors liquid resistence is inserted with the rotor circuit so as to increase the slip thereby increasing the torque and reducing the current. resistence is cut in steps and is

  • slip ring induction motor for sag mills

    SLIPRING INDUCTION MOTOR STARTING Slip Ring Induction motor Starter – M/s Sakthi Power Innovatives an ISO 9001 : 2015 Certified Company is engaged in designing and manufacturing of Slip Ring induction motor starter which is ideal for replacing old 'Resistance' and Rotor Control Circuit, liquid or chemical starters where the stator control ...

  • Starting current of MV motor - AC Drive China

    9/15/2013  The liquid rheostat has insufficient volume to adequately dissipate the heat buildup during normal start / run conditions, in which case the chemical composition may be varying. ... very typical for a ball mill or sag mill as Chris mentioned. ... the equivalent of DOL with a slip ring motor is electrodes shorted out which should not be possible ...

  • Starting current of MV motor - AC Drive China

    9/15/2013  The liquid rheostat has insufficient volume to adequately dissipate the heat buildup during normal start / run conditions, in which case the chemical composition may be varying. ... very typical for a ball mill or sag mill as Chris mentioned. ... the equivalent of DOL with a slip ring motor is electrodes shorted out which should not be possible ...

  • Liquid starter - Electric motors generators engineering ...

    7/31/2003  I've got a 500kW, 6.6kV slip ring induction motor, which uses a liquid starter to bring it up to speed and is then switched to synchronous operation. ... The motor drives a cement ball mill, and the operator is blaming the starter but I think that if it is not accelerating as it used to then the load has increased. ... Go to the "Search" bar at ...

  • 1000 HP Slip Ring Type Induction Motor and its starter ...

    8/26/2017  Liquid resistance starter (LRS) , In which external resistance is liquid media which is use for the starting method of slip ring motor. Since in a Slip Ring Induction Motor, the Rotor resistance is low, this can cause very high current and low starting torque.

  • Synchronous Motor for Sale, DC Motors, Electric Motors, AC ...

    7,000hp Motor, GE AC Wound (Slip Ring) Rotor, 390rpm, 12,800volts with liquid rheostat NEED SOME MOTORS ?, SEND YOUR REQUEST AND WE WILL FIND IT FOR YOU [email protected]

  • Slip Ring Motor Fundamentals - Bright Hub Engineering

    The slip ring and external rheostat makes it possible to add external resistance to the rotor circuit, enabling them to have a higher resistance during starting and thus higher starting torque. When running under normal conditions, the slip rings are automatically short-circuited by means of a metal collar, which is pushed along the shaft, thus ...

  • Wound Rotor - TECO-Westinghouse Motor Company

    easily. Wound rotor motors also can develop high starting torque at standstill - while maintaining low inrush. Long motor life is ensured with the use of external resistor banks or liquid rheostats that dissipate heat build-up generated during motor start-up. What makes the wound rotor motor a unique induction machine is its rotor.

  • How a slip ring motor work? - Answers

    The stator coil is exactly the same as a 3 phase induction motor. The difference being the rotar which has 3 phase wiring in star point or delta connection and also has the sliprings connected to ...

  • Liquid Resistance Starter - cse-uniserve.au

    smooth soft starting of heavy-load applications that use 3 phase slip ring motors with rated voltage up to including 11kV, rated motor powers from 200kW up to 10,000kW. Reference Projects Omya Australia - NSW Ball mill application: Rating 600 kW Fixed speed Test and commissioning RASP Mine Project - NSW Ball mill application:

  • Liquid Resistance Starters for Large Slip Ring Motors ...

    Whether it is a small pump or 18MW ball mill, our LRS units offer the lowest cost, longest life and most reliable motor starting for fixed or variable speed applications. The technology is simple, robust and suitable for use by all levels of operators with varying levels of experience.

  • Wound Rotor Induction Motors and Starters

    Wound Rotor Induction Motors and Starters Powell Industries, Inc. PO Box 12818 ... starting torque, and slip, are fixed. Although a motor designer can vary these characteristics at the design stage, once the motor is ... like the starting resistors, or a continuously variable resistance, like a liquid rheostat. Wound Rotor Induction Motors and ...

  • Wound Rotor Induction Motors and Starters

    Wound Rotor Induction Motors and Starters Powell Industries, Inc. PO Box 12818 ... starting torque, and slip, are fixed. Although a motor designer can vary these characteristics at the design stage, once the motor is ... like the starting resistors, or a continuously variable resistance, like a liquid rheostat. Wound Rotor Induction Motors and ...

  • Wound Rotor - TECO-Westinghouse Motor Company

    easily. Wound rotor motors also can develop high starting torque at standstill - while maintaining low inrush. Long motor life is ensured with the use of external resistor banks or liquid rheostats that dissipate heat build-up generated during motor start-up. What makes the wound rotor motor a unique induction machine is its rotor.

  • Rotor Resistance Starters - Home – OHMIC RESISTORS ...

    Slip Ring Motors are primarily used to start high inertia load or a load that requires a starting torque across a full speed range. By correctly selecting the resistors inserted into the Rotor circuit, the motor is able to produce maximum torque at a relatively low current from zero to full speed.

  • Lrs Principle - Motor Starting - LMPForum

    A very basic overview, but the advantage of wound rotor slip ring motor is that, through a LRS u can vary the resistance of the rotor. The advantages are 1. able to manipulate the torque speed curve, allowing u start with a much higher torque. Wound motors are suitable for application with heavy starting duties such as ball/sag mills, crushers etc.

  • Wye-Delta Starters vs Softstarters Mike Holt's Forum

    4/27/2017  The ball mill when loaded had a very large initial intertia and it needed a high initial starting torqure which was provided by a Liquid Rheostat. Depending on the rate at which the resistance in the Rheostat would change would affect the starting time of this motor and load.

  • Cement plant increases reliability, while reducing ...

    Slip ring rotor motors are recommended for applications that have high inertia loads, for example, mills, fans, and crushers. For these types of motors, the brush lifting system consists of starting the machine with the brushes in contact with the slip rings, connecting the rotor to the rheostat.

  • GEA30775 RM MV HV Motors Brochure r4 HR

    reliable starting but also ensures the best protection for your investment. Wound Rotors ~ Versatile ~ Long Track Recor d of Success ~ Soft Starts With the ability to provide a ‘soft-start’ when used in conjunction with a liquid resistor as well as some speed control, the wound rotor motor has long been utilized in mining and other process

  • AC Motors - Kirloskar Electric

    Starting: Stator Rotor Starter/Liquid Rotor Starter: Permissible starts/hr. 2 Hot Or 3 Cold or 4 Equally spread: Loading at reduced volts: These motors are designed to run at 75% of rated supply voltage for a duration of five minutes. Insulation / temp.rise: Class F/F: Temp rise Stator/Rotor: Class B/F: Direction of rotation: Bi-directional: No ...

  • Milling - Energy intensive and high maintenance

    Ball mills on the other hand, as far as process requirements are concerned, did not require variable speed. However, frequency converter based drive systems provide benefits that improve the ball mill operation. FIXED SPEED CONFIGURATIONS The key issue to operate a mill in a fix speed mode is the starting.

  • siemens/mining Flexible Slip Energy Recovery Drive

    For example, the mill speed can be increased to reach the best grinding results and efficiency, to tap the full potential of the mill. In case the mill begins to experience vibration, the speed can be decreased to calm down the system. A shutdown of the system is no longer required. Additionally, the system of slip-ring motors (WRIM) and