Ex-proof & high-efficiency three-phase motors trusted by global enterprises for extreme hazardous environments.
Shaanxi Nanfang Motor Technology Co., Ltd. is the authorized global distributor of Wolong. Wolong Electric Drive Group Co., Ltd. was established in 1984 and listed on the Shanghai Stock Exchange in 2002 (code SH600580). Over the past three decades, Wolong has solidified its global footprint with 3 prominent manufacturing bases, 39 advanced factories, and 4 dedicated R&D centers across the globe. Wolong focuses exclusively on the design and manufacture of high-performance electric motors and control systems, prioritizing a comprehensive global brand integration strategy that secures its leading position in R&D, processing technology, and sales in heavy industries.
Why global heavy industries source their three-phase induction and synchronous motors from our integrated industrial cluster.
From primary refining of cold-rolled non-oriented silicon steel sheets and premium electrolytic copper coils to advanced automated stator winding facilities, China's domestic motor ecosystem minimizes logistical delays and optimizes production costs.
Our collaborative institutions focus on fluid dynamics, thermal dissipation simulation, and rotor balancing technology. We produce multi-physics virtual test rigs to evaluate motor vibrations and structural redundancy under extreme dynamic loads.
Every industrial unit manufactured complies with stringent global benchmarks: ATEX and IECEx for flameproof protection, NEMA for American industrial projects, CSA for Canadian mining, and SABS/TESTSAFE for major South African and Australian operations.
Securing global technology dominance through targeted strategic acquisitions of century-old electric drive manufacturers.
In 2011, Wolong acquired 97.94% of the Austrian ATB Group. This acquisition integrated Morley's 130-year legacy in heavy coal mining drive systems, and Laurence Scott's specialized low-starting-current nuclear-grade generators. These brands provide unmatched high-specification mechanical designs.
Brook Crompton brought over a century of electric motor expertise to the Wolong group. Famed for pioneering energy-efficient motor designs, their premium "W" and "10" series low, medium, and high-voltage AC motors deliver reliable drive performance in hazardous and harsh industrial fields.
Acquired in 2011, German manufacturer Schorch has defined high-quality custom heavy-duty electric motors since 1882. Schorch drive systems serve oil and gas pipelines, large chemical plants, and heavy municipal water management facilities worldwide.
Founded in 1999 as a joint business venture, OLI owns the largest global market share for industrial vibration motors (MVE) and Ex vibration sensors. Their high-performance products are critical for processing raw bulk materials, mining sifters, and automated material handling equipment.
In 2015, Wolong acquired Nanyang Explosion-proof Group Co., Ltd. (CNE), China's premier explosion-proof research and manufacturing base. CNE specializes in high and low-voltage flameproof, increased safety, and positive pressure motors for oil, chemical, and nuclear power projects.
In 2018, General Electric's commercial and industrial motor division joined the Wolong ecosystem. Combining GE's robust American market presence and heavy industrial design standards with Wolong's advanced manufacturing scale, we deliver high-efficiency industrial motors globally.
An inside look at our advanced components, insulation systems, and structural designs.
Our rotors feature robust squirrel-cage designs. Cast aluminum rotors are produced using centrifugal casting or advanced high-pressure die-casting techniques. This merges the rotor bars and end rings into a unified, high-integrity unit to improve starting torque. For high-output applications, we use hand-inserted copper bar rotors featuring custom alloy end rings welded via precise automated procedures. High-speed motors also utilize custom-alloy retaining rings to prevent centripetal rotor displacement during dynamic acceleration.
Our stator coils use high-grade polyester-imide enameled wire, insulated with medium-powdered or low-powder mica tape containing high-density mica. We apply a full VPI (Vacuum Pressure Impregnation) process, pulling a deep vacuum before injecting solvent-free epoxy resin. This fills all voids, curing the winding into a solid unit with excellent moisture resistance, high mechanical strength, and superior thermal conductivity (Class F or H insulation ratings).
Our motor frames are optimized using digital structural and fluid multi-physics simulation platforms. Cast from high-tensile grey cast iron or welded from structural carbon steel, the design prioritizes large heat-dissipation fins to maximize convective airflow. Internal support ribs minimize vibration and structural resonance, helping the motor withstand heavy mechanical shocks and maintaining low vibration levels.
The fan cover system comprises an optimized fan cowl, air guide cylinder, protective debris screens, and integrated acoustic silencer plates. The side-entry air inlet bypasses obstacles behind the motor frame, minimizing intake turbulence and aerodynamic noise. Fitted with sound-absorbing lining materials and rated to IP22 protection, the system prevents accidental contact while maintaining optimal cooling airflow.
Ensuring cross-border compliance and project acceptance with certified drive systems.
Nemko / ATEX
CSA Standard
CE Directives
CCC Mark
SABS Approved
TESTSAFE Australia
Our marketing strategy relies on robust certification compliance. ISO 9001 Ex Standard: Wolong maintains accredited quality systems, simplifying trade and compliance for international buyers. NEMA Standards: Mechanical dimensions and electrical criteria are verified through comprehensive load, starting torque, and vibration tests to secure UL and CSA listings. IECEx & ATEX Standards: Certified flameproof (Ex d), increased safety (Ex e), and positive pressure (Ex p) designs facilitate simple integration across European (EU) and international chemical markets. TESTSAFE Standards: Certification via Testsafe—the Southern Hemisphere's premier mining safety authority—permits the export of Chinese coal mine motors directly to Australian and South African underground installations.
Engineered to drive heavy equipment and industrial infrastructure globally.
Petrochemical refining requires continuous operation and high explosion-proof protection. We supply medium and high-voltage Ex d, Ex e, and Ex p motors to drive process compressors, high-pressure oil pump systems, and cooling towers, ensuring safety in hazardous atmospheres.
Our heavy-duty flameproof mine motors drive high-load slurry pumps, conveyor systems, and coal shearers. Equipped with water-cooled jackets (YBBP series) and robust steel frames, these motors withstand high humidity, abrasive coal dust, and mechanical impacts.
Water treatment and power plants rely on large vertical induction motors (YKS, YKK series) to drive feedwater pumps and circulating fans. High electrical efficiency and low starting currents ensure grid stability during startup, minimizing operational costs.
Global industrial motor procurement is shifting from initial cost optimization to evaluating the Total Cost of Ownership (TCO). Sourcing officers must balance efficiency ratings, maintenance needs, and digital connectivity.
Expert answers to common technical, regulatory, and sourcing questions about 3-phase AC motors.
PMSM motors, such as the WEPM series, achieve IE4 or IE5 ultra-efficiency ratings by utilizing high-coercivity permanent magnets on the rotor, eliminating rotor copper losses. This results in a higher power density, smaller frame size, and excellent efficiency even at partial loads or low speed operation under VFD control.
Wolong products hold multiple certificates including ATEX (Europe), IECEx (Global), CSA (North America), SABS (South Africa), and TESTSAFE (Australia). These standards ensure that flameproof (Ex d), increased safety (Ex e), or positive pressure (Ex p) motors meet local safety requirements, allowing global operations to standardize on a single motor vendor.
The VPI (Vacuum Pressure Impregnation) process extracts air and moisture from the stator core and insulation layers under a vacuum. Solventless epoxy resin is then injected under pressure to fill all microscopic voids, creating a solid insulation block that protects against electrical surges, moisture ingress, chemical contaminants, and mechanical vibrations.
NEMA and IEC motors have different mounting footprints, shaft diameters, and configurations (inch-based vs. metric). However, Wolong designs custom dual-compliant motors or metric equivalents that match the electrical requirements of NEMA specifications while fitting physical IEC mounts, simplifying replacement in older facilities.
For offshore projects, motors require specialized marine coatings (C5-M paint systems), corrosion-resistant stainless steel hardware, and anti-condensation space heaters to prevent internal moisture buildup. We supply certified marine-grade three-phase motors with certifications from ABS, DNV-GL, and Lloyd's Register.
Explosion-proof, variable frequency, and high-voltage motors designed for industrial applications.
NANFANG