Explore our high-voltage and low-voltage heavy-duty explosion-proof motors designed to operate reliably in gaseous, dust-hazardous, and petrochemical industries.
Shaanxi Nanfang Motor Technology Co., Ltd. is the authorized global distributor of Wolong Electric Drive Group Co., Ltd. founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (code SH600580).
Over more than three decades of strategic expansion and high-end tech integration, Wolong has built a global motor manufacturing ecosystem, including 3 primary manufacturing bases, 39 advanced manufacturing factories, and 3 localized research and development (R&D) centers across Europe, Asia, and the Americas.
By executing an aggressive global brand integration strategy, Wolong has integrated a portfolio of globally recognized industrial giants. Wolong now acts as a technology and production powerhouse, offering high-efficiency solutions, variable frequency drives, and heavy machinery components that satisfy IEC, NEMA, ATEX, and IECEx requirements across global markets.
Explore Wolong Group Core TechAn authoritative look at safety standards, efficiency benchmarks, and supply chain strategies in hazardous environment operations.
In modern petrochemical, hydrogen, coal mining, and industrial process industries, explosion safety is non-negotiable. Standard electric motors can act as ignition sources due to electrical arcing, surface heating, or static buildup. Flame proof motors (typically designated under protection type "Ex d" or "Ex de") are engineered specifically to contain any internal explosion and prevent the propagation of sparks or flames into the surrounding hazardous atmosphere.
Currently, global procurement teams are shifting toward high-efficiency permanent magnet technology (PMSM) paired with variable frequency drives. This migration ensures safety compliance with IECEx and ATEX standards while driving down operational costs (OPEX) in oil platforms, refineries, and underground coal extraction.
Industrial operations in North America, the European Union, Australia, and the Middle East face different regulatory frameworks (NEC, ATEX, Testsafe). International procurement requires manufacturers with mature, cross-certified platforms. Wolong's unique structure bridges these requirements: NEMA standard frames (NSHE series) certified under UL and CSA are delivered alongside IEC-compliant, ATEX-approved medium-voltage and high-voltage machines.
The manufacturing capabilities in China have evolved from simple assembly lines to highly automated, smart digital factory platforms. Wolong's intelligent factories integrate automated stator winding, advanced VPI (Vacuum Pressure Impregnation) chambers, precision dynamic balancing, and automated test arrays that simulate extreme load conditions. This smart manufacturing foundation guarantees that every export motor maintains strict dimensional tolerance, structural redundancy, and flame-path safety compliance, providing substantial cost advantages and fast delivery cycles.
How our engineering design solves complex industrial challenges in demanding environments.
We provide full-spectrum explosion-proof certifications (ATEX, IECEx, CU-TR/EAC, Testsafe, UL, CSA) tailored for diverse hazardous locations globally. Our motors comply with Gas Groups IIA, IIB, IIC and Dust classification requirements.
Choose from our dynamic line of IE3, IE4, and ultra-high efficiency IE5 induction and permanent magnet synchronous motors. Reduced energy consumption leads directly to lowered greenhouse gas emissions and lower lifecycle costs.
We offer extensive customization, including variable frequency speed regulation (VFD integration), high-voltage configurations up to 13.8kV, space heaters, RTDs, specialized shaft designs, and chemical-duty paint systems.
Wolong has established dedicated motor and drive control R&D centers in China, Europe, and Japan, complemented by a Central Research Institute in Shanghai. This global collaborative network allows Wolong to conduct advanced materials research, multi-physics simulations, and noise attenuation optimization. Certain motor product lines represent the absolute peak of global drive technology.
Our brand portfolio includes historic icons such as Brook Crompton, Morley, Laurence Scott, Schorch, and ATB, alongside China's premier explosion-proof research and manufacturing base, Nanyang Explosion Group (CNE). This unique combination guarantees world-class heritage and engineering expertise.
Bringing together legendary British, German, Austrian, and American electric motor manufacturing giants under one unified global drive strategy.
In 2011, WOLONG Group achieved a milestone by acquiring 97.94% of the Austrian ATB Group, positioning WOLONG as a core controller of European motor design. The ATB group brings along specialized manufacturers:
WOLONG successfully integrated Brook Crompton Motors, a pioneer in high-efficiency design and standard industrial electric motors, including the famous Brook Crompton "W" and "10" series for harsh processing environments.
Additionally, Schorch Electric Motor (established in 1882 in Germany) joined WOLONG. Schorch drives are critical to petrochemical pipeline systems, gas extraction, and public water infrastructure. Their heavy-duty asynchronous and synchronous flameproof motors provide security under extreme load transitions.
For screeners, feeders, and bulk handling systems, WOLONG's partnership with OLI Vibration Motors (dating back to 1999) delivers high-grade Ex vibration sensors and heavy-duty industrial vibrators.
In 2018, the industrial motor division of General Electric (GE) merged its operational capability with WOLONG. This integration provides engineering backup for NEMA-frame, heavy-duty processing machinery, cement plants, and pulp facilities across the Americas.
A detailed analysis of the metallurgical, insulation, and aerodynamic features built into our explosion-proof motor line.
Featuring a squirrel-cage construction, our rotors utilize centrifugally cast aluminum or precision die-cast methodologies for low-voltage frames. For larger high-voltage systems, copper bar rotors with advanced end-ring welding and dynamic balancing are integrated to prevent bar fracture under high starting torque loads.
Built with high-content mica tapes and reinforced with polyester film/glass cloth. The entire stator assembly goes through VPI (Vacuum Pressure Impregnation) to eliminate micro-voids, providing moisture resistance, high dielectric strength, and Class H thermal margins.
Constructed from high-tensile cast iron or welded steel, structural shapes are optimized through multi-physics heat dissipation and vibration simulations. High structural redundancy ensures that the frame absorbs mechanical shock and prevents structural deformation under peak explosion pressures.
Designed with an integrated air guide cylinder, protective intake screens, and silencer plates. The IP22-rated side-inlet configuration decreases wind resistance and noise while shielding the fan from external physical impacts.
We maintain certification compliance to facilitate seamless system engineering across all major international jurisdictions.
Nemko / ATEX
CSA
CE Mark
CCC
SABS
TESTSAFE
Our motors are designed, manufactured, and tested to meet these international standard structures:
Where our explosion-proof motor systems run 24/7 without interruption.
Installed in offshore drilling rigs, refinery pipelines, and storage hubs. These motors power heavy compressors, crude transfer pumps, and hazardous ventilation fans where flammable gases (methane, ethylene, hydrogen) are continuously present.
Our heavy-duty, water-cooled flameproof motors withstand high moisture, coal dust accumulation, and mechanical impacts on conveyors, coal cutters, and ventilation shafts.
Featuring corrosion-resistant paint coatings and IP66 sealing options, these motors drive agitators, reactors, and centrifugal blowers handling highly reactive chemicals.
Answers to critical questions regarding flameproof motor selection, maintenance, and international compliance.
Ex d (Flameproof) motors are built to contain any internal explosion that may occur within the motor frame. The enclosure's flame paths cool exiting gases so they cannot ignite the external hazardous atmosphere. Ex e (Increased Safety) motors focus on preventing any sparks, arcing, or hot spots from occurring through stricter component clearances, premium insulation, and reduced temperature parameters, but they are not designed to contain an internal explosion.
No, VFD pairing requires careful thermal and electrical engineering. Using a VFD can increase motor operating temperatures due to harmonic currents and reduced cooling fan speeds at low frequencies. The motor must be specifically certified for VFD operation (e.g., our BPY-S30 or WEPM series) and typically includes embedded RTDs to monitor winding temperatures and ensure compliance with temperature class limits (e.g., T4 or T5).
Class/Division is the traditional North American classification system, whereas Zone classification is the international system defined by IEC/EN standards. Class I Division 1 is generally comparable to Zone 0 and Zone 1, representing areas where hazardous gases are likely to be present. Class I Division 2 corresponds to Zone 2, where hazardous mixtures occur only under abnormal conditions. We offer motors certified under both systems to ensure compliance with local electrical codes.
VPI introduces high-quality insulating resin into the motor windings under vacuum and pressure. This process removes air pockets and moisture, ensuring complete impregnation. The result is a solid insulation block that improves mechanical integrity, heat dissipation, and resistance to environmental contaminants, which is critical for medium- and high-voltage motors in harsh environments.
Cast aluminum rotors are standard for low-voltage, high-volume production because they provide excellent structural integrity and good torque characteristics. Copper bar rotors, used in larger high-voltage motors, offer lower electrical resistance, which increases operating efficiency and allows for optimized start-up profiles under heavy load conditions.
Browse our advanced permanent magnet synchronous motors (PMSM) and low-voltage heavy-duty cast-iron motors.
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