What guarantees the highest product quality in rolling mills?

Transcription

1 What guarantees the highest product quality in rolling mills? Siemens synchronous motors: A synthesis of high dynamic performance, extremely smooth running characteristics and ruggedness. Answers for industry.

2 Rolling-mill main drives: Exemplary when it comes to smooth running characteristics and dynamic performance In rolling mills, interruption-free processes and the quality of the rolled steel are of foremost importance. Drive technology plays a significant role in achieving this. With extremely high smooth running characteristics and dynamic performance, our main drives play a decisive role in attaining maximum product quality - even at high power ratings. Our synchronous motors with cylindrical rotor cover a power range from 500 kw up to 16.5 MW at speeds of between 20 and 1500 rpm perfectly tailored to meet your technical requirements. At home in rolling mills around the world Our rolling-mill motors are used in almost every rolling mill around the globe whether as drives for all hot and cold rolling mills or as drives for plate stands with the highest torque ratings worldwide. These powerful motors also prove their reliability in section and rod mills when processing carbon and stainless steels as well as in the area of aluminum and non-ferrous metals. 2

3 Synchronous motors with cylindrical rotor advantages at a glance Everything for interruption-free processes and outstanding quality of the rolled steel: Wide speed control range with constant power (field weakening) Optional overload capability up to 275% of the rated torque: minimum speed changes even at maximum load changes (e.g. during load impact) Low moment of inertia e.g. for reversing motors Slipring excitation: excellent dynamic performance; full torque even at the lowest speeds Pedestal bearing version for high power ratings: can withstand axial shock loads of up to 700 tons Extremely rugged technology with a long service life: permanent disturbancefree motor operation ensures the availability of the complete plant Compact motor design with optimized materials: low capital investment and lower lifecycle costs Can be adapted to specific customer demands: e.g. existing foundations Drive system and plant solution possible Large installed base - more than 3300 motors worldwide: competent service partner

4 Synchronous motor with cylindrical rotor: Crafted to handle the highest forces and abrupt load changes From the very nature of the process, drives for rolling mills are subject to high load changes and shock-type loads. For typical requirements in the rolling mill area - a wide speed range with continuous maximum power - generally a synchronous motor is more cost-effective than an induction motor. Without any special measures, it is capable of overloads of up to 275% of the rated torque over the complete speed range. Our powerful synchronous motors have a high speed stiffness and an extremely low torque ripple in spite of the enormous loads that are applied. The converter fed motors also cover a wide torque range from 30 all the way up to 2460 knm. 4

5 Durable technology and compact motor design When it comes to operating the complete plant, rolling-mill motors have an important role to play - or even a key one. The extremely rugged synchronous motor technology with a long service life plays a decisive role in the continuous disturbance-free operation of the motors and in turn secures the availability of your complete plant. The compact motor design with optimized materials further ensures a low capital investment and lower lifecycle costs. High availability and low maintenance costs Cylindrical rotor motors especially set themselves apart as a result of the extremely compact and reliable design. The complete rotor as well as the stator have the MICALASTIC vacuum-pressure impregnated insulation system used for high-voltage motors and proven over many years in operation. This results in high mechanical durability and constant electrical properties. Using the VPI technique (Vacuum Pressure Impregnation), which is perfectly coordinated with the insulation design, this insulation system fulfills all requirements - e.g.: Line or converter operation High switching and reversing strength due to the high stiffness of the winding overhangs Almost void-free insulation Excellent corona shielding Long service life as a result of the thermal endurance and temperature class F design Insensitive to chemically aggressive atmospheres Low maintenance costs Contrary to salient pole rotors, cylindrical rotors have no bolted pole connections or other retaining elements. The risk that bolt connections can loosen is therefore minimized - and maintenance costs are correspondingly low. The press fit between the core assembly and the rotor shaft as well as the compact design ensures outstanding ruggedness. For reversing mill motors, the rotor core is also tangentially wedged. Winding support ring for the rotor winding overhang The rotor winding overhang is tied to a special support ring and achieves its enormous stability and long service life as a result of the VPI technique Technical data at a glance Motor type Synchronous motor with laminated cylindrical rotor Optional: squirrel-cage induction motor Design IM 1001 / IM 7311 / IM 7315 Optional: IM 3011 and IM 3231 (edger) Speed Overload capability Voltages Cooling type Degree of protection 500 kw 16.5 MW rpm (typical base speed: rpm) 2.0 x Mrated continuously running rolling-mill motors, coilers 2.5 x M rated edgers, beam mills, reversing mill motors: up to 2.75 M rated maximum Designed for converter operation Regulations IEC Optional: NEMA MG -1 Water/air, force ventilated Optional: cooling through the foundation/pipe connection Motor IP44, slipring compartment IP23 Optional: motor IP54, slipring compartment IP54 5

6 Always the optimum features through tailored options Robust bearing design pedestal bearings for high power ratings Depending on the customer specifications and requirements, the motors either have roller or sleeve bearings. All of our rolling-mill motors have a locating bearing as standard. The size is defined by the forces that have to be absorbed. For direct drives of large plate mills, the axial thrust bearings are, for instance, designed for additional axial forces of up to 7000 kn that can occur in an emergency (when a roll breaks). Low moment of inertia for reversing motors Short torque response times and a low moment of inertia ensure short reversing times and that the speeds quickly adapt to the particular requirements when accelerating and braking. Even enormous load changes, for instance at the load impact, only have a minimum impact on the speed. The slipring excitation ensures the full torque even at the lowest speeds - and also improves the dynamic performance of the closed-loop control. High power ratings through effective cooling As standard, the rolling-mill motors are either equipped with an air-water cooler (IC86W) or are designed for cooling through ducts in the foundation (IC37). Cooling air is fed in at both face ends and the hot air is discharged from the back of the stator; for an IC86W cooling type the hot air is cooled in the motor using an air-water heat exchanger. This effective cooling guarantees a high power density. Further, the optimized air routing ensures a uniform temperature distribution within the winding therefore avoiding hotspots and facilitating a compact design. 6

7 Transformed from old to new By optimizing all of the relevant components, the outer dimensions are shorter and flatter than for older rolling-mill motors. As a consequence, the performance and/or efficiency of the machine or plant can be increased without any significant retrofit work. If it involves improving the performance of the existing plant as a whole, then our latest generation of rolling-mill motors offer you a favorablypriced solution. Replacement made easy It goes without saying that the foremost objective is to ensure simple, fast and smooth replacement. This is the reason that we adapt the performance data as well as the interfaces to the driven machine, the foundation and the electric cable, cooling water and bearing oil connections to the existing infrastructure. Our current range of rolling-mill motors can even replace motors from other manufacturers. In order to avoid resonant points in operation, when required, our engineering team can perform structural analyses. 7

8 Competence in numbers Especially in the metal processing sector, increasing productivity, higher capacities, lower operating costs and less emission are all issues that count. These are the factors against which successful solutions are measured. More than 3300 installed rolling-mill motors make us your competent solution supplier for rolling mills. This is also proven by the reference examples shown on the next page. All from a single source When required, we can also provide you with the complete drive system: Motor and converter - already perfectly harmonized and coordinated with one another in our factory. Generally, cycloconverters and PWM converters are used. The medium-voltage converters from the SINAMICS family are the matching system partner for our rolling-mill motors. 8

9 Customer: Baosteel, Baoshan Iron & Steel Group, Shanghai, China Requirement: Heavy plate mill. Operation start of the plate mill March Solution: Twin Drives for plate mill Power: kw Speed: 50 rpm Torque: 1910 knm Converter: SIMOVERT D Customer: Voestalpine, Linz, Austria Requirements: Tandem of rolling-mill drives. Special fit to existing foundation. Solution: Revamp, Twin Drives for hot strip plate mill Power: 2x 7000 kw Speed: rpm Torque: 2x 270 knm Customer: Requirements: Arcelor-Mittal Eisenhüttenstadt GmbH Germany (previously called EKO Stahl) Hot Strip Mill. All of the main drive motors were supplied, Siemens general supplier for the electrical engineering and automation. Solution: 2 vertical edger motors 1 twin reversing mill motor 5 finisher motors 1 crop shear motor 1 downcoiler motor Power kw: Speed rpm: Torque knm: Converter: SIMOVERT D, Masterdrive 9

10 Always the optimum drive The following table provides you with an overview of our rolling-mill drives. With this wide range, we cover the complete range of power ratings and can also implement the perfect drive for you. Small rolling-mill drives Design IM 1001 Applications Speed Torque Shaft height Finishing stand motors for cold rolling mills, coiler motors for cold and hot rolling mills MW rpm < 62 knm mm Compact rolling-mill drives (medium size) Design IM 1001 Applications Speed Torque Shaft height Drive for coilers, finishing stands, cold/hot rolling mills MW rpm up to 435 knm mm Motors for finishing lines Design IM 7311 Applications Hot strip finishing mill Speed Torque Shaft height MW rpm up to 685 knm 800 mm 10

11 Motors for reversing rolling mills Design IM 7311 Applications Twin motor for plate mills, heavy roughing stands Speed Torque Shaft height 5 16 MW rpm up to 2460 knm 800 mm Vertical edger Design IM 3011, IM 3231 Applications Edging stands in hot rolling mills or plate mills Speed Torque MW rpm knm Induction motor Design IM 1001 Applications Drive for shears, sizing presses Speed Torque Shaft height MW rpm up to 70 knm mm

12 More information: Siemens AG Industry Sector Industry Solutions Metals Technology Schuhstraße Erlangen, Germany Siemens AG Industry Sector Large Drives Nonnendammallee BERLIN GERMANY Subject to change without prior notice Order No.: E20001-A430-P500-X-7600 Dispostelle WÜ/30843 GD.LD.XX.LD.SO WS Printed in Germany Siemens AG 2010 The information in this brochure only provides a general description and performance features. For a specific application, this information will not always be applicable in the form described here. This information can also change due to ongoing product development. The required performance features are only binding if they have been expressly agreed upon in the form of a written contract. All product designations could be trademarks or product names of Siemens AG or other companies, which, if used by third parties, could infringe the rights of their owners.

13 Technical data of synchronous motors for rolling mills.

14 Technical data (standard / optional) Motor type Design Speeds Torques Overload capability Synchronous motor with laminated cylindrical rotor Optional: squirrel cage induction motor IM 1001 / IM 7311 / IM 7315, optional: IM 3011 and IM 3231 (edger) 500 kw 16.5 MW IM 7311: rpm (reversing mill motors) IM 1001: approx rpm IM 73xx: knm, IM 10xx: knm 2.0 x M rated continuously running rolling-mill motors, coilers 2.5 x M rated edgers, beam mills, reversing rolling-mill motors Optional: up to 2.75 M rated maximum Regulations IEC 60034, optional: NEMA MG 1 Shaft height Voltage IM 73xx: mm / IM 10xx: mm Designed for converter operation Torque characteristics 0 n rated m = const., n rated nmax m n -1 Cooling Separately-driven fan Excitation Degree of protection Main connection Auxiliary terminal box Water/air, force ventilated, optional: air with pipe connection Mounted, optional: integrated in the cooler cover Sliprings Motor IP44, optional: Motor IP54 Slipring compartment IP23, optional: Slipring compartment IP54 Busbars at the bottom, optional: 1 terminal box for each system IP55, optional: stainless steel Bearings Sleeve bearings, self-aligning roller bearings (not IM 7x) Optional: oil supply system; single-pipe cooler in the bearing possible depending on the speed and size Axial forces Oil intake, sleeve bearing Oil outlet, sleeve bearing Pressurized oil, sleeve bearing Insulation system Corresponding to the application area IM 1001 up to 50 kn, IM 731x up to 1000 kn DIN version with throttle valve, flowmeter, manometer, flange, meeting flange (H09), where required DIN version oil outlet with sight glass, thermometer bore and mating flange (H11), if required If required, oil pumps are mounted on the bearing shield, IM 731x: next to the bearings on the base frame Micalastic VPI impregnation Paint finish Standard system RAL 7030 Optional: special paint system; other RAL colors Winding temperature monitoring Air temperature monitoring Leakage water monitoring Bearing monitoring Anti-condensation heating 6 Pt100, 4-wire from the terminal box, optional: 12 Pt100, 18 Pt100 2 Pt100 cold air, 1Pt100 hot air Optional: 1 flow monitor per fan With contact 1 Pt100 for each radial bearing / 2 Pt100 for each axial bearing SPM measuring nipple can be screwed in for roller bearings Voltage depending on the requirement