Ex-compliant electric motors engineered for high-performance and safety in extreme Class I, Class II, Zone 1, and Zone 2 environments.
Shaanxi Nanfang Motor Technology Co., Ltd. is the primary authorized distributor of Wolong. As a critical sales, customization, and deployment wing, we connect industrial end-users globally with Wolong's unparalleled drive technology. Wolong Electric Drive Group Co., Ltd., founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (SH600580), has established itself as an absolute powerhouse in the global motor and control sector. Over four decades of continuous R&D and strategic global expansion have solidified Wolong's status as a top-tier designer and manufacturer of electric motors, especially for harsh and hazardous industrial environments.
Today, Wolong operates a vast industrial footprint comprising 3 key manufacturing bases, 39 state-of-the-art factories, and 3 global research and development centers. With localized engineering teams and regional stock warehouses, the group integrates top-tier R&D with localized application engineering to assist process plants, system integrators, and OEM equipment builders in executing projects seamlessly, on time, and in strict accordance with local safety mandates.
Through targeted strategic acquisitions of historic European and American motor companies, Wolong has unified centuries of rotating machine engineering expertise under a single, highly capable supply chain.
In 2011, Wolong acquired a 97.94% stake in the Austrian ATB Group, positioning itself as a key player in the European motor market. The ATB acquisition incorporated historic heavy industrial brands including Morley and Laurence Scott. Morley brings a century of expertise in building severe-duty mine motors. Laurence Scott specializes in heavy-duty custom engineering, low starting current motors for nuclear applications, and generator sets for naval vessels. This milestone also brought the German brand Schorch (established in 1882) under the Wolong umbrella, enhancing the group's capacity to design custom high-voltage, explosion-proof motors for high-power petrochemical compression systems.
Through the integration of Brook Crompton Motors, Wolong incorporated a premier British industrial brand with over a century of electric motor design expertise. Brook Crompton is recognized for pioneering early high-efficiency low-voltage motors. Additionally, in 1999, Wolong established a joint business framework with OLI Vibration Motors. This partnership combined global engineering for vibratory feeders, screens, and concrete consolidation systems with Wolong's manufacturing capability, establishing OLI as a global brand in vibration motor and Ex-certified vibration sensor technologies.
In 2015, China’s largest research and production base for explosion-proof motors, Wolong Electric Nanyang Explosion-proof Group Co., Ltd. (CNE), merged into the Wolong Group. This integration consolidated domestic manufacturing of flameproof, positive-pressure, and non-sparking high-voltage motors. To further expand its global footprint, Wolong acquired General Electric's (GE) commercial and industrial motor division in 2018. This acquisition brought GE's design platforms, NEMA standards expertise, and relationships across North American oil and gas, heavy mining, pulp and paper, and water treatment sectors into the group.
Every component is engineered to withstand extreme conditions, prevent thermal ignition, and suppress internal explosions.
Our rotors feature squirrel-cage designs optimized for hazardous environment duties. Cast aluminum rotors are produced using centrifugal casting or high-pressure die-casting, integrating rotor bars and end-rings into a single component. This structure enhances mechanical reliability and provides consistent torque output. For high-output applications, copper bar rotors are utilized, incorporating secured bars and end-ring welding. A high-speed protective retaining ring is also used to help prevent mechanical deformation during transients.
The stator coils are insulated with polyester film and reinforced glass-cloth, utilizing high-mica-content tapes. The entire assembly undergoes Vacuum Pressure Impregnation (VPI) to fill air voids with solventless resin, forming a solid, moisture-resistant barrier. This process enhances heat dissipation, mechanical strength, and moisture resistance, while providing Class F insulation standard with Class B temperature rise margins.
The motor frames are developed on digital structural and thermodynamic simulation platforms. These platforms evaluate thermal paths and structural natural frequencies, utilizing cast iron or heavy steel fabrications. The designs feature integrated cooling fins, low vibration levels, and mechanical structural margins. This construction helps isolate high shock loading and internal pressure waves in the event of an explosive ignition, preventing path escapes.
The low-noise ventilation system consists of an aerodynamic fan cover, a low-turbulent fan, and integrated silencer linings. The air inlet utilizes a side-suction design, which reduces the impact of nearby obstructions and lowers noise generation. Sound-attenuating elements within the path absorb high-frequency windage noise. The fan system is rated to IP22 ingress standards, preventing contact with moving parts.
To facilitate international trade and ensure safety compliance across boundaries, Wolong has obtained certifications for major global jurisdictions.
These certifications facilitate compliance for low-voltage and high-voltage explosion-proof motors exported to EU and international markets, adhering to EN/IEC 60079 series standards for Zone 1, Zone 2, Zone 21, and Zone 22 applications.
These standards verify that the electric motors meet North American mechanical and electrical specifications. Testing includes full-load efficiency, starting torque, insulation resistance, and thermal endurance (UL 1004 & CSA C22.2 No. 100).
As a coal product certification body in the Southern Hemisphere, TestSafe compliance supports the import of Chinese-manufactured underground mining motors into Australian mining operations.
Nemko/Atex
CSA
CE
CCC
SABS
TESTSAFE
How our vertical integration and localized engineering models address key supply chain risks for global project developers.
Manufacturing explosion-proof motors requires access to raw materials, electrical steels, silicon steel laminations, and copper wire. Wolong's facilities in Nanyang and Shangyu are situated near domestic metal processing hubs, securing feedstock supplies and insulating production schedules from raw material shocks.
Explosion-proof standards differ worldwide. Shaanxi Nanfang Motor Tech coordinates design parameters, drawings, and testing certifications (such as Ex d, Ex e, Ex nA, or Ex tc) to align with regional standards before fabrication begins, minimizing field installation delays.
Through brand integrations including ATB in Austria, Brook Crompton in the UK, Schorch in Germany, and GE in North America, we utilize regional engineering offices and service centers to provide technical support, start-up commissioning, and warranty services.
Procuring industrial-grade rotating machinery involves evaluating long-term costs beyond the initial purchase price. By utilizing high-efficiency permanent magnet synchronous designs (such as our WEPM series) and integrating digital remote monitoring, plants can reduce energy consumption and schedule predictive maintenance, helping to lower the total cost of ownership.
Adapting to modern process automation requirements through high-efficiency motor engineering and smart monitoring systems.
Answers to key engineering, procurement, and regulatory compliance queries regarding hazardous area electric motors.
An Ex d flameproof motor is designed to contain any internal explosion without allowing the flame to escape into the surrounding explosive atmosphere. The joints are engineered to cool escaping gases below the ignition temperature. An Ex e increased safety motor is built to prevent sparks, arcs, or dangerous hot spots from occurring on internal or external components under normal operating and overload conditions. Ex d is typically selected for Zone 1 environments with higher explosion risks, while Ex e is commonly utilized in Zone 2 applications.
Wolong operates a global technology platform that coordinates engineering designs across its subsidiaries. For example, high-voltage technologies from Schorch (Germany) are integrated with high-efficiency manufacturing technologies in China. Similarly, GE’s NEMA designs and Laurence Scott’s custom industrial designs are shared across the group to provide unified products globally.
VPI removes air from the stator slots using a vacuum, followed by the application of resin under high pressure. This process eliminates voids where moisture, chemicals, or dust could collect, which could lead to insulation breakdown and electrical sparking. It improves heat dissipation, structural rigidity, and electrical isolation under heavy workloads.
Yes, series such as the WEPM PMSM are designed for VFD operation. When operating a motor with a VFD in a hazardous area, thermal sensors must be installed to monitor winding temperatures and prevent overheating at lower operating speeds, which could exceed the auto-ignition threshold of the surrounding gases.
TestSafe certification verifies that mining motors meet Australian safety standards. Obtaining this certification enables Chinese-built heavy-duty mining motors to be used in Australian coal mining applications, aligning with local equipment compliance mandates.
High-voltage, non-sparking, positive pressure, and specialized heavy duty drive systems for process machinery.
NANFANG
