Safe handling of liquid steel ladles: modernization of drive and braking systems in a steelmaking plant

In the steel industry, few operations demand as much control and reliability as the handling of a liquid steel ladle. In addition to the high weight of the load, the material is transported at extreme temperatures, making it essential for every movement of the overhead crane to take place safely and predictably.

In an application carried out at a steelmaking plant, Varixx developed a drive, reversing, and braking solution for four motors, modernizing older equipment and providing greater operational safety, easier maintenance, and improved process reliability.

The challenge: controlling a critical load safely

The ladle used in the steelmaking plant transports molten steel and is moved by a large overhead crane. During operation, the system must not only move the load, but also reverse its direction and perform braking in a controlled manner.

In this type of application, a predictable stop is especially important to reduce load sway and provide greater control during movement.

The existing installation also presented another challenge: it used older electromechanical contactors, with moving components subject to wear, as well as converters with a non-modular design, making maintenance interventions more complex. The images shown on page 2 of the material illustrate the older equipment installed at the plant before the modernization.

An integrated solution for four motors

To modernize the application, Varixx developed a system for the four motors responsible for moving the liquid steel ladle, identified in the project as motors A, B, C, and D.

Each motor received a solution based on three main functions: drive, responsible for starting and stopping the motor and initiating movement; reversing, which allows the direction of rotation to be changed; and braking, responsible for decelerating and holding the load.

Standardizing the solution across all four motors also simplifies maintenance and spare parts management.

Electromagnetic braking without physical contact

One of the main features of the application is the use of a Foucault-type electromagnetic brake.

Its operation is based on a magnetic effect, with no friction between parts. As a result, there is no wear on mechanical braking elements such as brake pads or shoes.

In addition to reducing wear, the braking force can be adjusted precisely. In this application, this contributes to a smoother stop, reduced load sway, and lower maintenance requirements.

From older technology to a modern solution

The modernization replaced an architecture based on older equipment with electronic and modular components.

For drive and reversing functions, the older electromechanical contactors, subject to wear on their moving components, were replaced by modern electronic switching contactors with no contact wear.

For braking, the previous non-modular converter was replaced by a modular solution, making future interventions, maintenance, and component replacement easier.

The comparison presented in the material clearly demonstrates this evolution: interventions that were previously longer and more complex can now be carried out more quickly, while standardizing the four motors helps simplify maintenance.

Modernization using the existing infrastructure

Another important aspect of the project was the use of the plant’s existing infrastructure.

Rather than requiring a complete redesign of the installation, the solution was developed around the available resources, helping reduce both the required investment and the downtime during implementation.

The system also incorporates electrical protection at different levels, including power supply failure detection, helping protect the motors and equipment involved in the operation.

Benefits for steelmaking operations

With the modernization, the application delivers important benefits for demanding steel industry operations:

• Greater operational safety through controlled braking of a critical load;

• Reduced maintenance requirements thanks to frictionless braking and the use of electronic components;

• Greater robustness, with components designed for the demanding conditions of the steel industry;

• Standardization of the four motors, simplifying spare parts management and maintenance interventions;

• Faster installation by making use of the existing infrastructure and reducing the impact on production;

• Reduced exposure to unplanned downtime associated with wear on older components.

Technology applied to safety and operational continuity

Modernizing an industrial system does not simply mean replacing older equipment. In critical applications, modernization must take into account safety, reliability, maintenance, and production continuity.

In this steelmaking application, Varixx integrated drive, reversing, and braking functions into a standardized solution for four motors, replacing technologies subject to wear with modern equipment designed for simplified maintenance.

The result is an operation that is safer, more predictable, and better prepared for the demands of handling critical loads in the steel industry.