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Advantages of SER drives for SAG mills Friday, December 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 (cyclo-converter) is typically used because gearboxes and pinion gears reach their present limit in size.
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5.5 Self controlled synchronous motor Drive empolying load commuated Thyristor Inverter In fig wound field synchronous motor is used for large pow er drives.Permanent magnet synchronous motor is used for medium power drives. This drive consists of two converters.i.e source side converter and load side conve rter.
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When using a motor without bearings, the whole drive system only has two (2) pulley bearings and no couplings versus conventional design which requires twelve (12) bearings and two (2) couplings (figure 3). A low-speed synchronous motor with bearings would need two addi-tional bearings and a large coupling between the motor and drive pulley.
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Advantages of Synchronous Motor 1. It can be operated under a wide range of power factors, both lagging and leading. Hence, it can be used for power factor correction, in addition to supplying torque to drive loads. 2. Most synchronous motors are rated between 150 kW and 15 kW and run at speeds from 150 to 1800 RPM. 3.
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Synchronous motors are inherently not able to self-start on an AC power source with the utility frequency of 50 or 60 Hz. As stated in Chapter 1, this is because synchronous motors can develop a torque only when running at the synchronous speed.However, the synchronous speed for the utility frequency is too fast for the rotor to synchronize for starting as shown in …
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SYNCHRONOUS MOTOR DRIVES: Operation form faced frequency supply, synchronous motor variable speed drives, and variable frequency control of multiple synchronous motors. Self-controlled synchronous motor drive employing load commutated thruster inverter. Link: Unit 7 Notes —————————— UNIT – 8 INDUSTRIAL DRIVES: Rolling mill ...
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The permanent-magnet synchronous machine (PMSM) drive is one of best choices for a full range of motion control applications. For example, the PMSM is widely used in robotics, machine tools, actuators, and it is being considered in high-power applications such as industrial drives and vehicular propulsion.
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Give some application of load commutated inverter fed synchronous motor drive. Some prominent applications of load commutated inverter fed synchronous motor drive are high speed and high power drives for compressors, blowers, conveyers, steel rolling mills, main-line traction and aircraft test facilities.
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Synchronous motor driving a reciprocating compressor. Synchronous Motors For the Paper Industry Advantages •Higher efficiency Synchronous motors have a unique and merited position as the most efficient electrical drive in the industry and are often 1-2% more efficient than induction motors. • Power factor correction
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With the DR...J motors (LSPM technology), we, as a motor manufacturer, have succeeded in combining the advantages of the durable and robust asynchronous motor with those of the low-loss, compact synchronous motor. For greater efficiency in your applications. ... Group drive of several motors with synchronous speed on a frequency inverter;
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for the mill bearings, the mechanical mill brake control and the visualization of all parts of the drive system. Figure 1 shows a picture of a ringmotor used in copper concentrators. The poles of the rotor are directly mounted on the surface of the mill flange. Typically, the synchronous motors used in SAG mills have a power higher than 10 MW.
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The synchronous motor consists of a rotor and a stator. In the DST2 permanent-field synchronous motors, ... the long-term advantages of direct drive technology such as greater productivity, lower maintenance, better energy efficiency, etc. pay for themselves and it makes sense to replace the classical solutions with modern direct drives.
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A permanent magnet synchronous motor requires a control system, for example, a variable frequency drive or a servo drive. There are a large number of control techniques implemented control systems. The choice of the optimal control method mainly depends on the task that is put in front of the electric drive.
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With gearless drive systems, a low-speed synchronous motor replaces the high-speed asynchronous motor, gearboxes and couplings. The motor's rotor is flanged directly to the shaft of the drive pulley, thus eliminating gearboxes, couplings and the associated lubrication and cooling systems. The motor also does not require motor bearings.
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Synchronous motors. Synchronous motors cover the bases that induction motors cannot, namely their "asynchronous" nature. Synchronous motors match the output rotational frequency to the input AC frequency, allowing designers to use these motors in precisely timed applications, such as clocks, rolling mills, record players, and more.
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This paper provides a base case using standard accepted technology of two wound rotor single speed 4476 kW (6000 hp) motors to drive the primary SAG mills of a hypothetical 36,364 t/d (40,000 stpd) typical porphyry copper mill. One other fixed speed drive will be described and five variable speed drive configurations will be reviewed.
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SYNCHRONOUS MOTOR DRIVES: Operation form faced frequency supply, synchronous motor variable speed drives, and variable frequency control of multiple synchronous motors. Self-controlled synchronous motor drive employing load commutated thruster inverter.
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Abstract: Synchronous motors continue to be a viable alternative to induction motors because of efficiency advantages. Long used for providing leading kVARs for PF improvement and helping with the device switching in Load Commutated Inverter (LCI) drives, these machines are efficient prime movers for large Mill applications.
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motor drive for ball mill eindhovensestudentenraad nl. sincronous motor drive ball mill Ball MILL drive motor choices666 Кб In North America the most common drive in the past has been the low speed synchronous motor driving through an open pinion and bull this drive depends on the clutch to accelerate the mill it also may not be acceptable for some of the gear trains used …
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Synchronous motors continue to be a viable alternative to induction motors because of efficiency advantages Long used for providing leading kVARs for PF i . dual motor grinding mill drive synchronous . chinagrindingmill synchronous motors with millDual Motor Grinding Mill Drive Synchronous Motor air clutch synchronous grinding mill .
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The permanent magnet synchronous motors are very efficient, brushless, very fast, safe, and give high dynamic performance when compared to the conventional motors. It produces smooth torque, low noise and mainly used for high-speed applications like robotics. It is a 3-phase AC synchronous motor that runs at synchronous speed with the applied ...
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Dual motor grinding mill drive synchronous motor Cement Mill Drives Transmission (Mechanics) Engines Scribd The driving motors used in the cement industry can be broadly classified as Slip ring induction motor with rotor resistance starters and speed control are suited as crusher driv Function A cement mill is a drive used to.
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The Difference Between Synchronous and Asynchronous Motor are explained considering factors like its type, slip, requirement of additional power source, requirement of slip ring and brushes, their cost, efficiency, power factor, current supply, speed, self starting, effect in torque because of change in voltage, their operational speed and various applications of both …
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Synchronous 8 to 40 Poles Motors The 8 to 40 pole synchronous motor is a horizontal three-phase salient-pole synchronous motor. TDMK large synchronous slip ring motor for ball mill This series of ball mill synchronous motor is mainly suitable for large AC three-phase synchronous motor used in transmission mine mill. The main transmission ...
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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 pinion solutions were developed to power the mills.
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The induction motor does not require an excitation system to start motor. The Synchronous Motor requires the DC excitation system (or prime mover) to start the motor (i.e. for the rotor rotating). The motor is cheap, especially cage rotors and maintenance-free. The motor is costly and requires frequent maintenance.
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The site adopts ES580L driver + permanent magnet synchronous motor control + speed reduction. mechanism, which mainly drives the ball mill cylinder device to rotate. The adaptation of the ES580L driver perfectly solves the problem that the low-frequency output torque is not enough, and the overload capability is low, which may cause an alarm.
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