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In a ringmotor drive, Figure 4, a ringshaped motor encircles the mill and drives it directly without gears. The motor consists of rotating rotor elements (poles) that are bolted to the mill shell ...
USE OF THE LATEST TECHNOLOGY TO OVERCOME THE DEMANDS OF MILL OPERATION Tatiana Ravani von Ow,, Sales Manager Ringgeared Mill Drives ... were based on the slip energy recovery system with a wound rotor motor or AC drives. Faster ... of the gearless mill drives the operational output frequency is from Hz up to about 5 6 Hz. ...
motor life is ensured with the use of external resistor banks or liquid rheostats that dissipate heat buildup generated during motor startup. What makes the wound rotor motor a unique induction machine is its rotor. Instead of a series of rotor bars, a set of insulated rotor .
A woundrotor motor, also known as slip ringrotor 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. Woundrotor motors can be started with low
Mar 16, 2005· A wound rotor motor with shorted rotor circuits will likely have too little slip (the torquespeed curve is too near vertical). This makes the current under overload conditions rise too rapidly causing problems for the drive, especially if the drive sizing is a bit skimpy.
The induction motor drive has many applications like it is used in fans, blowers, mill runout tables, cranes conveyers, traction, etc. The induction motor drive is selfstarting, or we can say when the supply is given to the motor, it starts rotating without any external supply.
Search for used wound rotor motors. Find , AllisChalmers, General electric, P H, and Titan for sale on Machinio. ... 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. F... Washington, USA. Click to ...
Wound Rotor Motor Starters. ... Benshaw has successfully applied a 480VAC 700HP AC Variable Frequency Drive for positioning a MV synchronous motor driven ball mill. The Benshaw variable frequency drive powers the 4160Volt 3500HP synchronous ball mill motor during positioning to smoothly rotate the ball mill and bring it to the proper position ...
Dec 19, 2014· For large mills requiring variable speed, the wound rotor motor and SER drive are economical for a total rating of approximately 2MW to 16MW. Above 16MW, the gearless drive (cycloconverter) is typically used because gearboxes and pinion gears reach their present limit in size.
Woundrotor Induction. Common in Australia and Africa, the woundrotor motor also uses a gear system to transmit energy to the mill. It operates at a higher motor speed than the synchronous motor and needs an additional mechanical gearbox to reduce the motor shaft speed to the pinion speed needed to drive the mill.
MENZEL slip ring motors, also called wound rotor motors, are available in all current motor cooling and protection types for lowvoltage from 75 kW as well as medium and high voltage up to 15000 kW. They set technical standards in terms of size, performance, economy and reliability.
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 ...
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 municipal chat online.
Most woundrotor 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 woundrotor motors use resistor to connect the rotor windings. The resistance can be adjusted to control the speed/torque characteristis of the motor. To use a variable ...
HiTorque Drive System: The SIEG drive on the mini lathe and mini mill incorporates a 350 Watt conventional wound rotor DC motor and PWM controller card. The gears provide two speed ranges to enhance low speed torque because the output torque of a DC drive like this falls off as the motor .
We have the largest inventory in the world composed of 100 to 20,000 HP AC electric motors in wound rotor, squirrel cage, synchronous, vertical, and
AC Slip Ring/Wound Rotor Motors. AC Synchronous Motors. AC Vertical Motors. DC Motors. Full Voltage Starters. Reduced Voltage Starters. Variable Frequency Drives. Products. New Squirrel Cage Motors. Products. New Siemens Variable Frequency Drives. New Motortronics Soft Start Medium Voltage. Rebuilt Electric Motors. Large Electric Motors. Our ...
Wound rotor motors are typically used in application requiring high starting torques, a limited number of operating speeds, or a stepped acceleration to achieve a soft start. Typically, existing applications utilize an electromechanical starter on the stator, and introduce multiple stages of resistance in the rotor via a contactor arrangement to achieve a soft ramp.
Jun 28, 2019· The method of powering mills such as AG, SAG and Ball has a Fixed speed drives, with wound rotor motors or synchronous machines, were the .
A variablefrequency drive (VFD) or adjustablefrequency drive ... Woundrotor synchronous motors can be run at even higher speeds. In rolling mill drives, often 200300% of the base speed is used. The mechanical strength of the rotor limits the maximum speed of the motor.
So, we are able to control the speed of this type of motor easily. A woundrotor motor can be used in several forms of adjustablespeed drive. Certain types of variablespeed drives recover slipfrequency power from the rotor circuit and feed it back to the supply, allowing wide .
Woundrotor motors deliver speed control of heavy and hightorque ''s special about the woundrotor motor? This type of 3phase induction motor has high starting torque, which makes it ideal for applications where standard NEMA design motors fall short. The woundrotor motor is particularly effective in applications where using a squirrelcage motor may result in a starting current that''s
The primary drive is a 5000 HP (3730 KW) A/C Wound Rotor Motor. The hard charging Schorch motor keeps churning day after day. Dual axial pole magnets, cyclone air cleaning system, and split picking station allow for extremely clean and dense ferrous scrap. Slip Power Recovery Drive is included. Motor rotor current is managed in a switchable ...
Feb 07, 2008· vfd on slip ring "wound rotor" motors posted in Variable Speed Drives: I am involved in converting a ball mill, which requires a large amount of starting torque, from a slip ring motor driven application to a vfd driven appl. . We have sent the motor to our motor guy to refurbish and interconnect the rotor there any advice or similar applications out there that could be helpful ...
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