Direct Drive Roller System for Steel Industry
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Solution Overview
Problem
Current metalworking drive systems for rollers and winches suffer from torsional flexibility, leading to control accuracy issues and high maintenance costs due to complex mechanical components, which result in inefficiencies and reliability problems, especially when handling high-inertia loads like those in rolling mills.
Innovation Solution
A direct drive system with an electric motor integrated directly to the roller element, eliminating the need for intermediate mechanical components like gears and clutches, and incorporating a capture magnet to prevent magnetic interference, ensuring high torsional rigidity and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional drive train with clutches, gears, and intermediate mechanical components is used, then the drive can be separated from the roller for maintenance and installation, but the torsional flexibility causes control accuracy issues and oscillations in speed and angle of rotation
Solution Approach 1:
The electric motor is merged directly with the roller element to form an integrated direct drive system. The motor housing is connected directly to the roller housing, eliminating intermediate mechanical components like clutches and gears. This integration ensures torsional rigidity while maintaining ease of maintenance through modular design where the entire motor-roller assembly can be replaced as a unit.
Solution Approach 2:
The conventional mechanical transmission system (clutches, gears, cardan shafts) is replaced with a direct electromagnetic drive. The electric motor generates torque directly on the roller element through electromagnetic fields, eliminating mechanical transmission components that cause torsional flexibility and control inaccuracies.
2Ease of manufacture
If a conventional drive train with multiple mechanical components is used, then the drive can be mounted separately from the roller, but the complexity of moving parts increases maintenance costs and reduces reliability
Solution Approach 1:
The electric motor and roller element are merged into a single integrated assembly. The motor housing connects directly to the roller housing, creating a unified structure with no intermediate mechanical components. This reduces the number of moving parts that can fail, thereby improving reliability while maintaining installation flexibility through modular assembly design.
Solution Approach 2:
The problematic intermediate mechanical components (clutches, gears, bearings, cardan shafts) are extracted and removed from the drive train. Only the essential direct connection between motor and roller remains, eliminating sources of failure and maintenance requirements associated with complex mechanical transmissions.
3Strength
If a conventional drive train with gears and clutches is used, then the drive can be designed for high overload, but the space requirements and foundation costs increase significantly
Solution Approach 1:
The bulky mechanical transmission system (gears, clutches, reduction stages) is replaced with a compact electric motor that delivers high torque directly. The motor's electromagnetic design allows for high overload capacity without requiring large mechanical components or extensive foundation structures, significantly reducing the occupied space and foundation costs.
Solution Approach 2:
The drive system transitions from mechanical torque multiplication through gears to electromagnetic torque generation. This parameter change allows the motor to produce high torque at low speeds directly, eliminating the need for large gear systems and reducing the overall footprint and foundation requirements while maintaining high overload capacity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The direct drive system enhances control accuracy, reduces maintenance needs, and improves energy efficiency by eliminating complex mechanical parts, allowing for compact and reliable operation with increased drive power and reduced noise, while also simplifying the drive train and reducing costs.
Implementation Method 1
an electric motor with a stator and a rotor. The rotor is connected to the roller element, whereby the rotation of the rotor is transmitted to the roller element
Implementation Method 2
Furthermore, the device has at least one capture magnet, which is set up to prevent magnetic particles from being absorbed into the electric motor
Data Source
Figure 1
Figure 2a~3
Figure 4~5
AI summary
Device for handling a metal material in strip form in metal working, wherein the device comprises: at least one rolling element (200, 301), preferably a roller (200), a roll (200) or a winch (301), which is provided for cross-sectionally changing, transporting, storing, building up tension in and/or reducing tension in the metal material in strip form, and a drive (10, 100), which comprises an electric motor, preferably a torque motor or synchronous motor, with a stator (12, 102, 102') and a rotor (11, 101, 100'), wherein the device also comprises a frame (202, 302), the rotor (11, 101, 101') is connected to the rolling element (200, 301), whereby the rotation of the rotor (11, 101, 101') is transmitted to the rolling element (200, 301), and the stator (12, 102, 102') is mounted directly on the frame (202, 302) and/or the rotor (11, 101, 101') is connected directly to the rolling element (200, 301) or a shaft (201, 304) of the rolling element (200, 301).