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wound rotor motor mill drives

  • Wound Rotor Motor What is it Motion Control Tips

    Jul 17, 2017 · The stator of a wound rotor motor is the same as a typical induction motor, but the rotor has a three-phase winding, with each of the winding terminals connected to separate slip rings. In contrast, a traditional induction motor (aka "squirrel cage motor") has windings that are permanently short-circuited by an end ring. These motors are widely used in applications requiring high starting torque or low starting current, including mill drives, cement plants, mines, utilities, water works and many more. Features Separate slip ring comparment at non drive end to prevent dust ingress into motor

  • Slip Ring Induction MotorsBaldor

    These motors are widely used in applications requiring high starting torque or low starting current, including mill drives, cement plants, mines, utilities, water works and many more. Features Separate slip ring comparment at non drive end to prevent dust ingress into motor Jul 17, 2017 · The stator of a wound rotor motor is the same as a typical induction motor, but the rotor has a three-phase winding, with each of the winding terminals connected to separate slip rings. In contrast, a traditional induction motor (aka "squirrel cage motor") has windings that are permanently short-circuited by an end ring.

  • Eddy Current and Wound Rotor Drives Minneapolis, MN

    Wound-Rotor Drives. Wound-rotor induction motor speed is controlled by varying the current through the motor s rotating armature. Transistors control the current to provide smooth acceleration and deceleration. Wound-rotor drives are available in ratings from 50 HP and higher. Maximum top speeds are about 95 percent of synchronous speed and motors connected directly to the pinions driving the ring gear or by high speed motors that require a gear reducer between the pinions and the motors. Low speed motors are synchronous motors whereas the high speed solution is normally equipped with an asynchronous squirrel-cage motor. Fixed speed drives, with wound rotor motors or synchronous

  • SAG Mill ComponentsMineral Processing Metallurgy

    The use of wound rotor motors also provides for a low inrush situation, if the power system study demands it, and makes mill speed variation possible. This variation comes generally at a sace in motor efficiency because the reduced power demand from the mill Motors, A.C., Slip Ring, 60 Cycle AC Slip Ring Motors, Electric Motor Frame, Induction General Electric, Westinghouse, Allis-Chalmers, Toshiba, Asea, Reliance

  • Can a VFD run a wound-rotor motor

    Altivar variable frequency drives may be used to operate wound-rotor motors. Most wound-rotor motors are used where high starting torque is required so an Altivar 312, Altivar 32 or Altivar 71 drive would be most suitable for this application. The wound-rotor motors use resistor to connect the rotor BALL MILL DRIVE MOTOR CHOICESArtec Machine Systems. All has started about 50 years ago with mill diameters less than 20 feet driven by fix speed synchronous or wound rotor motors with the power of about 2 MW. Around 10 years later, the mill sizes increased, but the necessary torque could not be transmitted by one pinion therefore dual

  • SER DRIVE

    The Slip Energy Recovery Drive (SER Drive) is a technology well proven in the industry for large power motoring systems that allows precise motor speed control at the same time that recover the slip energy in the Wound Rotor Induction Motors (WRIM).They are also the dominant technology in wind turbines. Altivar variable frequency drives may be used to operate wound-rotor motors. Most wound-rotor motors are used where high starting torque is required so an Altivar 312, Altivar 32 or Altivar 71 drive would be most suitable for this application. The wound-rotor motors use resistor to connect the rotor

  • Eddy Current and Wound Rotor Drives Minneapolis, MN

    Wound-Rotor Drives. Wound-rotor induction motor speed is controlled by varying the current through the motor s rotating armature. Transistors control the current to provide smooth acceleration and deceleration. Wound-rotor drives are available in ratings from 50 HP and higher. Maximum top speeds are about 95 percent of synchronous speed and Synchronous motors are preferred, but in some cases wound rotor motors may be used. Motor speeds will vary from 225 rpm to 450 rpm. The motor and pinion shafts are connected together through a flexible coupling. This drive is the most compact, resulting in minimum floor space. BALL MILL DRIVE MOTOR CHOICES artec-machine

  • What is Induction Motor Drive Explanation Starting

    The induction motor drive has many applications like it is used in fans, blowers, mill run-out tables, cranes conveyers, traction, etc. The induction motor drive is self-starting, or we can say when the supply is given to the motor, it starts rotating without any external supply. Fixed speed drives, with wound rotor motors or synchronous machines, were the Liquid Resistor Starter (LRS) are containing agitated mechanical parts requiring Read More. Starting of slip ring induction motor explained in an easy manner. where a 600kW ball mill motor is started by use of a secondary liquid. Read More. Wound Rotor

  • Use of wound rotor motor with VFD Automation Control

    Aug 14, 2003 · Wound rotor motors typically are high torque-high slip motors. They have starting torque ratings about double standard motors and VFDs typically limit the starting current and torque. Older motors may not stand up to the high voltage spikes generated by the switching devices in the VFD. The secondary resistors with contactors are extreemly A wound-rotor motor, also known as slip ring-rotor motor, is a type of induction motor where the rotor windings are connected through slip rings to external resistance. Adjusting the resistance allows control of the speed/torque characteristic of the motor. Wound-rotor motors can be started with low inrush current, by inserting high resistance into the rotor circuit as the motor accelerates

  • Slip Ring Induction MotorsBaldor

    These motors are widely used in applications requiring high starting torque or low starting current, including mill drives, cement plants, mines, utilities, water works and many more. Features Separate slip ring comparment at non drive end to prevent dust ingress into motor We have solutions for all motors and drives cement applications LV MV squirrel cage motors LVfrequency converters-- Single drive up to 2800 kW-- Multi drive up to 5600 kW MVfrequency converters 315 kW up to 27000 kW Direct Torque Control (DTC) Converter transformers DC drives (new revamping) Slipring motors (wound rotor induction motors)

  • ball mill liquid rotor starterpopulareducation

    Fixed speed drives, with wound rotor motors or synchronous machines, were the Liquid Resistor Starter (LRS) are containing agitated mechanical parts requiring Read More. Starting of slip ring induction motor explained in an easy manner. where a 600kW ball mill motor is started by use of a secondary liquid. Read More. Wound Rotor In wound rotor motors, the rotor is "wound" with wire similar to the stator, with their terminal ends connected to 3 slip rings on the output shaft. These slip rings are attached to brushes and variable power resistor banks, where operators can change the speed of the motor by varying the resistance through the rotor

  • Mineral Processing Toshiba International Corporation

    Application Ball Mill Equipment 1 x 44000kW 30 pole 6600 volt Synchronous Motor Location Kalgoorlie, Western Australia Ernest Henry Mine Application 1 x 11000kW SAG Mill driven by Dual 5500kW motors, 1 x 5500kW Ball Mill Equipment 3 x 5500kW 6 pole 11000 volt Wound Rotor Induction Motors Location Cloncurry, Queensland In module 3 you will learn principles of DC motors, traditional brushed motors, as well as electronically driven brushless motors. We will discuss shunt wound, series wound, compound wound, servo, stepper, and torque motors

  • What is a Wound Rotor Motor and How Does it Work

    In wound rotor motors, the rotor is "wound" with wire similar to the stator, with their terminal ends connected to 3 slip rings on the output shaft. These slip rings are attached to brushes and variable power resistor banks, where operators can change the speed of the motor by varying the resistance through the rotor motors connected directly to the pinions driving the ring gear or by high speed motors that require a gear reducer between the pinions and the motors. Low speed motors are synchronous motors whereas the high speed solution is normally equipped with an asynchronous squirrel-cage motor. Fixed speed drives, with wound rotor motors

  • Gearless mill drivesGrinding ABB

    Our GMD eliminates all mechanical components of a conventional mill drive system, such as ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings By mounting the rotor poles directly onto the mill, the mill itself becomes the rotor of the gearless motor. The wound rotor induction motor has some distinct application advantages. Historically, it has been used for hard-to-start, high inertia fans, or where power system requirements demand a soft start. With a liquid rheostat, or a static secondary speed control, the wound rotor is an important alternative drive

  • Wound rotor motor mill drivesexart

    Wound Rotor Motor Mill Drives. A wrim is a type of induction motor with unique construction, in the cement and mining industry for starting and driving large grinding mills in fact, until about 1985, a wound rotor induction motor was the, motors on grinding mills, slip power recovery drives have been applied in other industries, such as in Application Ball Mill Equipment 1 x 44000kW 30 pole 6600 volt Synchronous Motor Location Kalgoorlie, Western Australia Ernest Henry Mine Application 1 x 11000kW SAG Mill driven by Dual 5500kW motors, 1 x 5500kW Ball Mill Equipment 3 x 5500kW 6 pole 11000 volt Wound Rotor Induction Motors Location Cloncurry, Queensland

  • Use of variable frequency drives with wound rotor motors

    Jim McKee (deceased) Alabama Electric Motor Service Sheffield, Alabama Technical Education Committee Member The slip ring or wound rotor induction motor (WRIM) has been used in a variety of applications. Many of these applications use the WRIM s high starting torque capabil­ity while limiting current to start and run very high inertia loads such as hammer mills, rolling mills, centri­fuges The wound rotor motor has a lower starting torque per amp of starting current than any other type of three phase motor. Inverter rated motors are specifically designed to be operated by variable frequency drives. True. Ramping permits the motor to bring the load up to speed slowly as opposed to simply connecting the motor

  • TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL

    systems for wound rotor motors and frequency converter drives. Improvements in power electronics technology and controls have resulted in variable frequency converters that offer high efficiency, high reliability and availability at competitive cost. The first Gearless Mill Drive Aug 14, 2003 · I used to design wound rotor starters, and a VFD can work, but as some people mentioned, not always. A Wound rotor motor has double or more starting torque avaible to it, and this torque is (as mentioedn in one reply) a factor of the motor so the VFD will not hurt the rated starting torque.having said that, most VFDs only hold 200 (if that) current for a very limited time before

  • Wound Rotor Induction MotorThe Engineering Projects

    Oct 10, 2016 · That was the basic structure of stator, now let s talk about rotor. Rotor of Wound Rotor Induction Motor. In Wound Rotor Induction Motor, the rotor has a 3 phase winding similar to stator winding. Rotor is also cylindrical in shape and has slots to carry winding. The winding is placed evenly on slots of the rotor. are connected to 3 slip rings. Jul 17, 2017 · The stator of a wound rotor motor is the same as a typical induction motor, but the rotor has a three-phase winding, with each of the winding terminals connected to separate slip rings. In contrast, a traditional induction motor (aka "squirrel cage motor") has windings that are permanently short-circuited by an end ring.

  • Torque Capabilities of DC and AC Drives in the Constant

    the rotor control resistors. To use a wound rotor motor as an adjustable speed drive, the rotor control resistors must be rated for continuous current. If the motor is used only for a slow acceleration or high Sponsored by Texas Instruments. Sensorless, sinusoidal brushless dc motor control reduces ripple and boosts efficiency in automotive applications.

  • Can a VFD run a wound-rotor motor

    Altivar variable frequency drives may be used to operate wound-rotor motors. Most wound-rotor motors are used where high starting torque is required so an Altivar 312, Altivar 32 or Altivar 71 drive would be most suitable for this application. The wound-rotor motors use resistor to connect the rotor Oct 10, 2016 · That was the basic structure of stator, now let s talk about rotor. Rotor of Wound Rotor Induction Motor. In Wound Rotor Induction Motor, the rotor has a 3 phase winding similar to stator winding. Rotor is also cylindrical in shape and has slots to carry winding. The winding is placed evenly on slots of the rotor. are connected to 3 slip rings.