Browse our primary range of explosion-proof three-phase AC asynchronous motors designed for critical industrial drives.
Shaanxi Nanfang Motor Technology Co., Ltd is the official authorized distributor of Wolong. Founded in 1984 and listed in 2002 (code SH600580), Wolong Electric has built a powerful global network of manufacturing sites, technical research centers, and safety-certified testing divisions. Wolong is committed to a global brand strategy, leading in design precision and high-durability motor manufacturing for hazardous industries worldwide.
Explore Distribution ProfileIndustrial facilities in harsh environments require explosion-proof motor configurations that mitigate mechanical and electrical spark hazards, ensuring absolute plant safety.
Flameproof (Ex d) structures contain internal explosions without letting flame fronts escape. Dynamic tolerances and critical joint lengths cool escaping gases below ignition temperatures.
High efficiency reduces heat buildup and lowers surface temperatures (T-class parameters), which is crucial for minimizing ignition risks in flammable atmospheres.
Modern Ex motors feature RTDs and thermistors, along with insulated bearings to resist harmful VFD harmonic currents, preventing spark-generating insulation failures.
Integrating European precision and American heavy-duty engineering under one unified manufacturing ecosystem.
Acquired in 2011, Austria's ATB Group brings over a century of European engineering expertise. Morley specializes in robust underground coal mining conveyor systems and flameproof equipment.
Known for premium high-efficiency motors. Schorch (est. 1882) provides heavy-duty drive systems for oil and gas, petrochemicals, and marine operations, meeting strict European standards.
Joined Wolong in 2018. GE's medium and high voltage designs support heavy industries, while CNE (China's leading explosion-proof base) ensures high performance for petrochemical and mining applications.
WOLONG's strategic acquisitions have consolidated top-tier European technology. By taking control of the Austrian ATB Group (including Morley in underground mining and Laurence Scott in low-starting-current naval systems), WOLONG gained access to advanced mechanical designs and nuclear-grade safety protocols. Laurence Scott, renowned for its low starting currents, has equipped naval vessels and nuclear plants, earning the prestigious Queen's Award for three consecutive years.
Further integrations brought Brook Crompton's efficiency and Schorch's heavy-duty industrial systems under the Wolong umbrella. Partnering with OLI for vibration motors (MVE) and acquiring General Electric's (GE) commercial and industrial motor division in 2018 has established Wolong as a leading global manufacturer of explosion-proof and standard industrial motors.
Designed for mechanical strength and thermal efficiency, preventing ignitions in explosive dust and gas atmospheres.
The rotor features a squirrel cage design, with cast aluminum rotors widely utilized for their reliability and durability. These rotors are produced using centrifugal casting or high-pressure die-casting, integrating rotor bars and end rings into a single, high-strength component. This design ensures structural integrity and outstanding torque properties.
For larger capacities and high-voltage operations, copper bar rotors are used. They feature secure bar anchoring and advanced end-ring welding, while high-speed designs include retention rings to prevent centripetal deformation.
The stator coil is insulated with high-grade polyester film reinforced with glass cloth and high-mica-content tapes. The complete assembly undergoes a Vacuum Pressure Impregnation (VPI) process to ensure a void-free structure, protecting it against moisture, vibration, and thermal stress.
This meticulous insulation engineering prevents micro-discharges and corona tracking, which is essential for ensuring long operational life and spark-free performance in volatile gas atmospheres.
The motor frame is designed using digital structural and fluid multi-physics simulations to optimize heat dissipation and minimize vibration. Built from high-tensile cast iron or fabricated steel, the frame offers exceptional structural rigidity to absorb mechanical shocks and resist external impacts.
The external cooling rib design increases active surface area, while optimized internal air paths ensure balanced heat distribution, keeping surface temperatures well below hot-spot limits.
The low-noise ventilation system includes a dynamic guide cylinder, protective intake window, and integrated silencer plate. The side-entry air intake reduces turbulence, energy loss, and acoustic levels.
The fan blades are aerodynamically optimized for maximum airflow at minimal shaft load. Rated at IP22, the fan cover prevents external contact while protecting internal moving parts from debris.
Our advanced manufacturing facility integrates Industry 4.0 principles, employing robotic welding, automated winding, and real-time smart monitoring. These digital workflows ensure consistent manufacturing quality and eliminate human error in safety-critical insulation applications.
With complete vertical integration—from raw material processing to final dyno load testing—we minimize external supply risks. This unified supply chain ensures predictable, reliable lead times even during global supply disruptions, providing a key advantage for large engineering projects.
We comply with all major international standard systems, enabling smooth integration and compliance approval for your project.
ATEX / Nemko
CSA Certs
CE Compliance
CCC Ex-proof
SABS South Africa
TESTSAFE Australia
WOLONG maintains active, audited production files across global agencies, ensuring smooth import and engineering approvals without project delays:
Providing high-reliability drive power for critical infrastructure and processes across diverse operational environments.
Driving high-pressure centrifugal pumps, oil transfer stations, gas compressors, and refining mixers where volatile hydrocarbon fumes (Gas Group IIB/IIC) are constantly present.
Driving tunnel boring machines (TBMs), longwall shearers, and heavy conveyors. Features robust cast-iron housings resistant to coal dust buildup and mechanical impacts.
Powering large ventilation fans in highway and railway tunnels. Designed to operate reliably at elevated temperatures during emergency smoke extraction.
Answers to common technical, compliance, and ordering questions from procurement managers and engineers.
ATEX is a mandatory European Union directive required for equipment used in hazardous areas within the EU. IECEx is an international certification scheme recognized globally. Many projects specify both to simplify compliance verification across different regions.
Our VFD-compatible Ex motors are equipped with PT100 temperature sensors in the windings and bearings to monitor thermal conditions. We also use insulated bearings to prevent bearing currents and electrical pitting, ensuring spark-free operation.
We provide extensive customization, including specialized shaft dimensions, non-standard mounting configurations (IM B3, B5, B35), custom terminal box positions, heavy-duty paint finishes for marine environments, and space heaters to prevent condensation.
Through our global network of 39 factories and authorized service centers across Europe, Asia, and the Americas, we provide prompt technical support, replacement parts, and field engineering services to minimize operational downtime.
Specialized motor models designed for tunnel boring, water pumping, variable frequency control, and high-voltage applications.
NANFANG
