Advantages of SER drives for SAG mills | GoHz
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 (cyclo-converter) is typically used because gearboxes and pinion gears reach their present limit in size.
A 1500 hp wound rotor motor drives a roughing mill | Chegg
Transcribed image text: A 1500 hp wound rotor motor drives a roughing mill setup to reduce a hot metal steel billet from 200mm x 200mm to 120mm x 120mm. Due to its continuous operation and in consideration of the heat, the gearbox, which the motor drives need constant circulating lubrication via an oil pump driven by a 7.5 hp motor.
TECO-Westinghouse Wound Rotor Motors
Wound Rotor. Wound rotor motors are an extremely versatile breed of induction motors. Featuring a rugged design, these machines provide the unique ability to gradually bring up to speed high-inertia equipment and large loads smoothly and easily. Wound rotor motors also can develop high starting torque at standstill – while maintaining low inrush.
Roughing mill set-up A 1500 hp wound rotor motor | Chegg
Transcribed image text: Roughing mill set-up A 1500 hp wound rotor motor drives a roughing mill setup to reduce a hot metal steel billet from 200mm x 200mm to 120mm x 120mm. Due to its continuous operation and in consideration of the heat, the gearbox, which the motor drives need constant circulating lubrication via an oil pump driven by a 7.5 hp motor.
Ball Mill Drives - Mineral Processing & Metallurgy
DIRECT CONNECTED Ball Mill DRIVE. When power exceeds 300 HP a direct connected drive is recommended. This drive is also applicable for lower power requirements if desired. Synchronous motors are preferred, but in some cases wound rotor motors may be used. Motor speeds will vary from 225 rpm to 450 rpm.
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 coils.
MOTOR TECHNOLOGY Saving energy - TMEIC
Figure 4: typical SAG mill motor drive equipment. Since such drives Figure 3: one of two wound rotor motors for a 10,000kW SAG mill ICR SEPTEMBER 2009. are in volume production at this time, support should be available for years to come. Getting renewal parts for …
Roughing mill set-up A 1500 hp wound rotor motor | …
Transcribed image text: Roughing mill set-up A 1500 hp wound rotor motor drives a roughing mill setup to reduce a hot metal steel billet from 200mm x 200mm to 120mm x 120mm. Due to its continuous operation and in consideration of the heat, the gearbox, which the motor drives need constant circulating lubrication via an oil pump driven by a 7.5 hp motor.
vfd on slip ring "wound rotor" motors - Variable Speed ...
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 windings.Is there any advice or similar applications out ...
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 ...
Wound Rotor Motor Mill Drives - Fact Jeugd Noord
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.
Medium Voltage VSDs in mill drive applications
Ac Squirrel cage motors draw around 500% to 900% of Full Load Current (FLC) during starting. This might not pose a huge concern when starting motors with low kilowatt (kW) ratings but as soon as one starts talking about mill drive applications where the installed motors are generally in the range of 800 kW up to 15 000 kW, it does become a concern.
A 1500 hp wound rotor motor drives a roughing mill | …
Transcribed image text: A 1500 hp wound rotor motor drives a roughing mill setup to reduce a hot metal steel billet from 200mm x 200mm to 120mm x 120mm. Due to its continuous operation and in consideration of the heat, the gearbox, which the motor drives need constant circulating lubrication via an oil pump driven by a 7.5 hp motor.
Electric Drives for Large Ore Grinding Mills
The high-torque wound-rotor motor starts the mill under control of a resistor-contactor secondary or a stepless liquid rheostat. The latter can be regulated for constant torque or constant acceleration, or some combination as indicated. The liquid-rheostat is preferable, but a little more expensive for smaller drives.
Can a VFD run a wound-rotor motor? | Schneider Electric USA
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 …
Drive Solutions for the Global Mining Industry
drive application is a dual-pinion SAG mill driven by two 5,000 kW wound rotor induction motors (WRIM). Two TMdrive- 10SPRs control motor speed by recovering rotor current and returning the power to the utility supply.