The world's first permanent magnet direct-drive WK-55 electric shovel, co-developed by China Energy Zhunneng Group and Taiyuan Heavy Industry Co, has entered heavy-load testing at the Har Us open-pit coal mine in Ordos city.

Since commissioning began in late December 2024, the machine has undergone nearly four months of rigorous testing, completing evaluations of its hoisting, walking, slewing, crowd mechanisms, auxiliary systems, and no-load coordination. Each stage was closely integrated, steadily overcoming technical challenges and laying a solid foundation for full operational deployment.

Compared to the traditional WK-55 model, the upgraded version introduces groundbreaking innovations. Its "permanent magnet motor + drum" direct-drive system replaces conventional mechanisms, streamlining the machine's structure and reducing maintenance costs.

The domestically developed variable-frequency control system also replaces Siemens' 6SE70, breaking foreign technology monopolies. Efficiency has improved from 10 to 15 percent, and a hydraulic electromagnetic braking system now responds in under 130 milliseconds during power loss – enhancing both safety and component lifespan.

Estimates suggest the new shovel can save up to 800,000 kWh of electricity annually, cutting carbon dioxide emissions by 225 metric tons. The machine marks a significant step forward in advancing energy efficiency and supporting the green, low-carbon transformation of the mining industry.