Metal strips, typically less than 3mm thick and delivered in coil form, serve as the foundational material for continuous, high-speed production in the metallurgical industry. During the full process of strip unwinding, high-speed operation, and precise recoiling, quality issues such as stretching breakage, misalignment, and surface wrinkling often occur. The constant tension control system is the core equipment ensuring stable production, acting as the “nervous system” of the strip production line.
As the primary energy-consuming component in strip production lines, the motors within constant tension systems account for approximately 94% of total life-cycle energy costs. This makes motor-driven upgrades the key breakthrough for energy savings and performance improvement. Traditionally, the industry relies on a “three-phase asynchronous motor + gearbox + imported inverter” configuration, which suffers from low efficiency, high energy consumption, frequent gearbox wear, noise, oil leakage, and large space requirements, highlighting the urgent need for cost reduction and efficiency enhancement.
Targeting Industry Pain Points with Precision Solutions
Wolong Nanyang Explosion-Proof Motor (Wolong Nanyang) has closely collaborated with professional metallurgical equipment integrators to understand the challenges and technical requirements of cold-rolled strip production lines. Conventional constant tension drive systems on these lines face issues such as low transmission efficiency, high energy consumption, frequent gearbox wear, excessive noise, and lubrication problems, all of which limit production quality and cost efficiency.
To address these issues, customers chose Wolong’s customized low-speed permanent magnet direct-drive motors and advanced drive control systems. This solution modernizes traditional transmission systems, improving energy efficiency and productivity, while meeting the requirements for increased output, energy savings, and environmental compliance.
Customized Solutions for Complex Metallurgical Work Conditions
The Wolong solution includes high-precision, high-power low-speed permanent magnet motors, integrated cooling systems, and a multi-drive DC microgrid control system. With IP55 protection and S1 continuous duty rating, the system adapts to harsh production environments and supports precise bidirectional rotation, high torque at low speed, and stable tension control throughout the production process.
Following the principle of “high efficiency, minimal modification, maximum retention of existing core equipment,” the upgrade focuses solely on the drive and control system. The traditional multi-drive asynchronous motors, gearboxes, and imported inverter cabinets are replaced by the new permanent magnet system, reducing mechanical transmission power losses and maintenance costs, while significantly increasing daily production capacity.
Performance Metrics Driving Quality and Energy Savings
Leveraging Wolong’s high-end drive control technology, the upgraded production line achieves industry-leading performance: precise control with PG vector technology allows speed accuracy up to ±0.25%, eliminating strip misalignment and wrinkling; motor power ranges from 30kW to 500kW, with overall system efficiency ≥95%, achieving up to 25% energy savings and more than 20% increase in daily output; maintenance frequency drops to less than once per year, eliminating oil leakage and environmental contamination; and operating noise is ≤85dB(A), meeting green manufacturing standards, while the inverter cabinets provide multiple safety protections and mean time between failures exceeds 50,000 hours. The upgrade comprehensively enhances production stability, processing precision, speed, and product yield, achieving simultaneous quality, efficiency, and cost improvements.
Full Lifecycle Support for Long-Term Operation
Wolong provides a standardized, full-process service system to ensure smooth project implementation and long-term operational stability. Within 7 days of contract activation, customers receive complete technical documentation and equipment qualification certificates. During installation and commissioning, Wolong offers free on-site technical guidance to facilitate rapid production start-up. A rapid-response after-sales mechanism guarantees 24-hour support and 48-hour engineer arrival for any manufacturing issues, alleviating customer concerns about operation and maintenance.
Green and Low-Carbon Implementation for Metallurgical Upgrades
By replacing traditional low-efficiency drive systems with high-performance permanent magnet direct-drive motors, Wolong not only reduces electricity consumption at its source but also eliminates gearbox oil leakage and excess noise, improving production environments. Post-upgrade calculations show annual electricity savings of up to 1.7 million kWh, optimizing energy consumption per ton of steel and supporting the metallurgical industry’s transition to efficient, low-carbon, and green modern production lines. This solution provides a strong driving force for intelligent, environmentally friendly transformation of traditional metallurgical operations.
