Premium low-voltage and high-voltage AC electric motors engineered for heavy-duty coal mine machinery and explosive environments.
Underground coal mining remains one of the world's most demanding electrical engineering applications. The presence of explosive gases (methane) and combustible coal dust demands drive systems designed for peak electrical efficiency and maximum explosion safety. Globally, the mining sector is undergoing a massive transformation, transitioning towards decarbonization, automated remote operations, and digital health monitoring. Consequently, high-performance, flameproof motors are central to this transformation.
High-efficiency motors, particularly IE4 and IE5 permanent magnet synchronous designs, are replacing older asynchronous units to significantly lower carbon footprints and minimize operational expenses. Modern coal mines require motors capable of coping with extreme voltage fluctuations, heavy-duty mechanical loads, and harsh high-humidity or abrasive conditions while providing absolute safety in Zone 1 and Zone 2 environments.
Combining local application expertise with the global engineering and manufacturing power of Wolong Electric Drive Group.
Shaanxi Nanfang Motor Technology Co., Ltd. serves as the authorized partner and primary global channel distributor of Wolong Electric Drive Group Co., Ltd. Founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (code SH600580), Wolong has grown to become a world leader in motor drive and control systems.
Wolong operates 3 primary global manufacturing bases, 39 advanced factories, and 3 state-of-the-art research and development centers worldwide. By focusing on motor control technology, Wolong delivers highly integrated, smart drive packages that increase productivity across energy, extraction, and petrochemical markets.
Wolong's growth is driven by the strategic acquisition of some of the most respected and long-standing brands in the industrial motor industry.
Acquired by Wolong in 2011, the Austrian ATB Group is one of Europe's top three motor manufacturers. Within ATB, Morley Motors brings over 130 years of history specializing in underground coal mining. Morley is globally respected for heavy-duty, high-performance flameproof mine machinery drives, including Laurence Scott motors known for low starting currents.
A pioneer with over a century of innovation in electric motor design, Brook Crompton joined the Wolong Group, introducing its highly efficient "W" and "10" series. These motors are optimized for hazardous, abrasive environments, providing exceptional energy savings and robust mechanical performance.
Established in Germany in 1882, Schorch joined Wolong in 2011. Schorch represents premium engineering in large, customized drive systems for oil and gas, heavy chemicals, maritime propulsion, steel plants, and tunnel ventilation applications worldwide.
Dating back to their joint operations in China in 1999, OLI holds the largest global market share in heavy-duty vibration motors (MVE) and Ex-certified vibration sensors, ensuring reliable performance in material sifting and flow operations.
Acquired in 2015, CNE is China's largest research and production base for explosion-proof motors. The brand's low-voltage asynchronous and high-voltage Ex-proof motors are widely used in dangerous oil, gas, chemical, metallurgical, and nuclear energy installations.
In 2018, GE's commercial and industrial motor division joined Wolong. As one of the oldest names in industrial engineering, GE brings advanced technology and massive industrial project experience, supporting Wolong's global reach in oil and gas, mining, water treatment, and materials processing.
A look inside the design details that protect Wolong motors against thermal stress, humidity, and explosive gas ignition.
Featuring a robust squirrel cage layout, our rotors are produced using centrifugal casting or advanced die-casting processes, integrating the rotor bars and end rings. This ensures high structural integrity and excellent torque transmission. For larger-capacity motors, copper bar designs are employed with secure welding procedures and high-speed safety rings, guaranteeing reliable long-term operations under heavy mechanical loads.
Our coils are insulated with high-mica content tape, reinforced with glass cloth and polyester film. The entire assembly undergoes a Vacuum Pressure Impregnation (VPI) cycle, forming a solid, moisture-proof, and flame-retardant structure. This design provides excellent dielectric strength, high thermal stability, and mechanical resistance to moisture and vibration.
Designed using 3D multi-physics fluid and thermal simulations, our high-grade cast iron or steel frames feature high structural margins. The design optimizes heat dissipation and isolates motor vibration. This ensures the frame can withstand significant mechanical shocks and keeps internal temperatures low, even during continuous overload operations.
The ventilation system features an air guide cylinder, protection window, and integrated silencer plates. The side-entry air inlet bypasses external obstacles behind the motor housing to reduce energy losses and lower sound levels. Rated at IP22, the fan hood ensures high protection while maximizing cooling air flow.
We design our products around the three core pillars of modern mine operations: safety compliance, energy efficiency, and project flexibility.
We provide globally recognized certification coverage, enabling fast integration into hazardous oil, gas, chemical, and coal mining environments.
Available in IE3, IE4, and IE5 efficiency levels, including advanced permanent magnet synchronous motor options to reduce energy consumption.
Comprehensive low-voltage and high-voltage power options built for variable speed applications, ventilation fans, pumps, and continuous haulage machinery.
Operating a global mining business requires compliance with strict regional and international standards. Shaanxi Nanfang Motor Technology ensures that every motor shipped conforms to the standard certifications required for the local market.
Nemko/ATEX
CSA
CE
CCC
SABS
TESTSAFE
Wolong's motor designs are utilized globally to power critical heavy equipment in diverse industries.
Ventilation Fans
Slurry & Water Pumps
Gas Compressors
Continuous Miners
Conveyor Systems
Tunnel Boring Machines
Nuclear Cooling Pumps
Petrochemical Machinery
Wolong is focused on driving the future of electric motor technology through integration with digital monitoring systems. Our next-generation smart motors feature integrated wireless vibration sensors, high-frequency stator thermal sensors, and real-time current signature analysis. These technologies allow predictive maintenance algorithms to identify mechanical failures before they cause unexpected downtime.
Additionally, we are expanding our permanent magnet synchronous motor (PMSM) systems. Operating on high-performance Variable Frequency Drives (VFDs), these systems deliver full torque even at zero-speed, providing improved safety and control for heavy conveyors and tunnel boring machinery.
Detailed technical answers to common questions asked by engineers and procurement professionals.
Ex d (flameproof) indicates the motor's enclosure is designed to contain an internal explosion of gas or coal dust without propagation. Ex de combines a flameproof (Ex d) main enclosure with an increased safety (Ex e) terminal box. The Ex e design provides extra protection against high temperatures and sparking at connection points, making it highly reliable for underground coal mines.
Vacuum Pressure Impregnation (VPI) extracts air pockets and moisture from the stator coils, filling them with high-mica insulation. This produces a solid structure that protects the stator winding from moisture, high humidity, vibration, and coal dust, ensuring high dielectric strength.
Unlike standard induction motors, PMSM drive systems run at high energy efficiency (IE5 and beyond) across their entire speed range. They deliver full startup torque at low frequency, reducing mechanical wear on conveyor belts and tunnel boring cutters while lowering overall energy consumption.
Engineered for heavy conveyor belts, boring systems, pumps, and variable frequency drive applications.
Connect with our engineering specialists to specify the exact explosion-proof motor system configurations, dimensions, and efficiency grades for your mine installations.
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