R-modyn

Overview

General description
Technical data overview
Customer benefits
Typical applications

General description

R-modyn are rolling mill motors and are used worldwide in the metals industry in rolling mills.Tailored to address particular customer requirements, they are used as main drives in almost all rolling applications and all rolling mill types – in five different types of construction.
Their extremely high smooth running properties and dynamic performance play a decisive role in achieving maximum product quality – even at high power ratings. Their range of power ratings extends from 0.5 MW up to 16.5 MW at speeds of between 20 and 1500 rpm.
For the typical requirements in the rolling mill area – wide speed control range with a constant maximum power – R-modyn motors can provide up to 250% rated torque over the complete speed range without requiring any special measures. The synchronous motors – with cylindrical rotor – can even withstand the highest forces, surge loads and step-like load changes.
In spite of the enormous loads, the motors have a high speed stability and extremely low torque ripple. With 30 to 2460 kNm, the converter-fed motors also cover a wide torque range.

top of page

Technical data overview

Brief overview
Motor type:	Synchronous motor with laminated cylindrical rotor Optional: squirrel cage induction motor
Type of construction:	IM1001 / IM7311 / IM 7315 Optional: IM3011 and IM3231 (edger)
Power rating:	500 kW – 16.5 MW
Speed:	20 – 1500 rpm (typical base speed: 50 – 900 rpm)
Overload capability:	2.0 x M_rated continuously running rolling mill motors, coilers 2.5 x M_rated edgers, beam rolling mills, reversing mill motors (rougher) (up to 2.75 M_rated maximum)
Speed:	20 – 1500 rpm (typical base speed: 50 – 900 rpm)
Voltages:	Designed for converter operation
Cooling type:	Water/air, forced ventilation Optional: ventilation through the foundation/pipe connection
Degree of protection:	Motor housing IP44, slip-ring housing IP23 Optional: motor housing IP54, slip-ring housing IP54
Regulations/Standards:	IEC60034 Optional: NEMA MG-1

top of page

Customer benefits

Features	Customer benefits
Wide speed control range with constant power rating (field weakening)	Optimum adaptation to the torque and speed requirements of the rolling process
Overload capability up to 275% of the rated torque: minimum speed changes – also for maximum load changes (e.g. for the load impact of heavy passes)	Sufficient power reserves for process tolerances and the ability to add new steel types to the range.
Low moment of inertia, e.g. for reversing motors	Short reversing times for a high throughput, high control quality in the drive train
Slip-ring excitation	Power reserves for high throughput. Constant tension over the complete speed range, outstanding control dynamic performance secures consistently high quality of the rolled material
Pedestal bearings for high power ratings: can withstand axial surge loads of up to 700 tons	Absorbs the axial forces of gearless rolling stands even in fault situations
Rugged technology with a long service life, proven Micalastic® insulation system, cylindrical rotor	Continuous disturbance-free motor operation guarantees the highest degree of availability of the complete plant
Compact, material-optimized motor design	Low capital investment, lower lifecycle costs
Adapted to address customer requirements: e.g. existing foundations	Cost/time saving for retrofits ensures a fast payback time of the investment
Drive system and plant solution possible	Everything from a single source from sector experts, no unnecessary interfaces, high reliability through components that are harmonized and coordinated with one another
Large installed base – more than 3300 rolling mill motors worldwide	Process know-how secures high-quality, competent service from Siemens head office or a Siemens partner close to you