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Ring gear drives huge grinding mill. ... Low-speed versions are normally synchronous motors and are used with air clutches. The ndida SAG mill will be, by far, the largest gear-driven mill ...
B. SYNCHRONOUS MOTOR WITH AIR CLUTCH The high starting torque design synchronous motors directly connected to the mills have been used for years. This type of drive would be able to accelerate the mill in about eight seconds, but would require about 600% current inrush. The low starting torque design synchronous motors with an air clutch used
Right from the beginning we have high performance slow-running motors for the metal industry in our delivery program. After direct current motors having dominated for a long time, today dynamic, high-quality three-phase motors are used: for larger torques as synchronous machines as solid pole versions, for smaller torques as asynchronous squirrel-cage motors.
Abstract: Synchronous motors (SMS) continue to be a viable alternative to induction motors because of efficiency advantages. Since SMs have long been used to provide leading kvar for power factor (PF) improvement and to help with the device switching in load-commutated inverter (LCI) drives, these machines are efficient prime movers for large mill applications.
How the LM vertical ball mill works: The vertical ball mill drives the mill drive gearbox through the motor to drive the disc to rotate. The material falls from the feed port to the grinding disc through the lock feeder, and the hot air enters the mill from the air inlet.
A squirrel-cage motor or a synchronous motor started direct on line without any help of a frequency converter normally cannot produce sufficient starting torque. Therefore it is required to accelerate the mill without load until the rated speed and then, by means of a clutch system, couple the motor to the mill. Another possibility is to use a
Synchronous motors are usually of the low torque type in order to reduce the inrush current and the load of the mill drive train. A starting coupling is required to limit the motor torque during mill start. In the case of a high-speed synchronous motor a hydraulic coupling can be used. Low-speed low-torque motors use air clutches for a ...
AC adjustable speed motor drive systems are the preferred technology for new rolling mill installations and modernization projects. TMEIC designs and manufactures two types of AC solutions for this purpose. Salient pole synchronous motors that meet the high power and torque demands of a hot strip mill, as well as roughing and finishing stands.
Jul 11, 2019· Principle of Operation Synchronous Motor. Synchronous motors are a doubly excited machine, i.e., two electrical inputs are provided to it. Its stator winding which consists of a We provide three-phase supply to three-phase stator winding, and DC to the rotor winding.
Sag Mill Synchronous Motors Prompt : Caesar is a famous mining equipment manufacturer well-known both at home and abroad, major in producing stone crushing equipment, mineral separation equipment, limestone grinding equipment, etc.
May 08, 2016· What is synchronous motor and why it needs exciter? What is synchronous motor and why it needs exciter? Sunday, May 8, 2016. SYNCHRONOUS: means "turns at a speed proportional to applied frequency independent of load". ... A Synchronous Induction Motor is a motor that will operate at Synchronous speeds: There is no slip rpm.
This channel was founded by Sabin Mathew, an IIT Delhi post graduate in 2012. At Learn Engineering, we aim to provide quality engineering education. Our vide...
7.1 Ball Mill drives with synchronous motor and air clutch/fluid coupling. 7.2 Ball Mill with slip ring induction motor. 8. Maintenance and operational issues 18 8.1 Synchronous motor and exciter 8.2 Slip ring induction motor and rheostat 8.3 Air clutch 8.4 Fluid coupling 9. Conclusions 21
Up to 3,600 rpm, 53 MW, Synchronous Motor TMEIC custom designs and builds medium and high power synchronous motors for special applications such as driving mills, blowers, pumps and compressors. The example shown here is a 53 MW synchronous motor for a steel mill blower. It runs at 3,000 rpm with a 10 kV supply. Data for typical synchronous ...
Synchronous motors require additional starting mechanism to initially rotate the rotor near to the synchronous speed. No starting mechanism is required in induction motors. The power factor of a synchronous motor can be adjusted to lagging, unity or leading by varying the excitation, whereas, an induction motor always runs at lagging power factor.
Motor Protection. 446. Protection. The SPM controls starting, synchronizing and protection of collector-ring or . brushless type synchronous motors. Squirrel Cage Protection. An important motor protection function is preventing squirrel cage winding . overheating during motor starting. For brushless motors squirrel cage
A mill can be provided with a low speed synchronous motor having torques of approximately 40% starting, 30% pull-in and 175% pull-out for use with a magnetic clutch. A magnetic clutch drive may involve a close coupled unit with two pinionshaft bearings and combination clutch-coupling (Drive 1), or four bearings with a clutch and flexible ...
COPPER MOUNTAIN: OVERVIEW ON THE GRINDING MILLS AND THEIR DUAL PINION MILL DRIVES ... Mill drive motor type Synchronous 200 RPM Inside diameter 10,363 mm Length 6,096 mm ... mills driven by a dual pinion drive option have utilized an air clutch not only to start the mill, but also to facilitate rough load sharing between the two pinions. ...
Jun 16, 2004· I have a Synchronous Motor coupled to a Ball Mill by clutch. It starts uncoupled and after it synchronizes the clutch engages the load. Nameplate and other data and parameters are: 1000HP, PF 1.0, 4160V, 60HZ, 180 rpm, 60°C Rise Stator, 70°C Rise Rotor, Excitation 125V, kVA 800, 111 Amps armature, 125 V field, Exc. Amps 158, frame 9404, GE.
synchronous motor clutch mill - PE Jaw Crusher. Ball mills are used primary for single stage fine grinding, regrinding, and as the second stage in two stage ... how air clutch engage cement mill - building crusher . Free Chat
On site we have a Sag Mill Driven by a 5500KW Motor. We have a vibration issue right across the Mill. ... a synchronous motor shall run at a very precise speed. If you really measure 210 RPM, then something is terribly wrong. ... The specialist they brought to site,first thing he wanted to change the clutch. When the Sag Mill was in operation ...
ball mill air clutch install - ketorent. ball mill air clutch components ball mills, the starting torque restrictions of some of the newer mill drive configurations, and the softness of some In other parts of the world, the wound Drive 2 A 5000 HP, 514 rpm synchronous motor with an air clutch and gear box to a Get Price 【More Info】
The synchronous motor and induction motor are the most widely used types of AC motor. The difference between the two types is that the synchronous motor rotates at a rate locked to the line frequency since it does not rely on current induction to produce the rotor's magnetic field.
Ball mill, 13' diameter x 21' long, Manufactured by Allis Chalmers (Svedala), rubber-lined mill, with Siemens-Allis 2,000 HP, 4000 volt, 200 RPM synchronous motor, Eaton airflex clutch. Includes trommel discharge, ball mill rejects conveyor, lube system, etc. .
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