Explore our leading industrial electric drive solutions, certified to match the rigorous demands of global oil, gas, chemical processing, and mining industries.
Technical whitepaper analyzing pneumatic and variable-frequency electrical drive safety integration in extreme risk zones.
Explosion-proof air motors are historically favored in petrochemical processing, paint shops, and mining sites due to their absolute spark-free physical nature. They rely entirely on pressurized gas expansion. However, modern heavy-duty process industries demand precision speed control, energy efficiency monitoring, and digital integration. Shaanxi Nanfang Motor, as the authorized distributor of the global pioneer Wolong Electric, bridges this technical divide. We offer cutting-edge ATEX, IECEx, and CSA certified low-voltage variable frequency drives (VFD) and positive-pressure motors to replace or work alongside heavy-duty pneumatic compressors.
The global push towards carbon neutrality forces chemical manufacturers to evaluate every kilowatt spent. While pneumatic air motors run at typical energy efficiency rates of 15% to 25%, our variable frequency synchronous permanent magnet motors (such as the Wolong WEPM series) operate at IE4 and IE5 super-premium efficiency zones. This optimization minimizes thermal dissipation, which in turn drastically reduces the surface temperature profile of the motor—a vital requirement for satisfying T4 (135°C) and T6 (85°C) thermal compliance parameters in explosive hydrocarbon gas environments.
In combustible powder handling (Zone 21 & 22) or volatile refinery zones (Class I Division 1 & 2), thermal emission is the primary hazard. Traditional air motors mitigate this by using cooling gas expansion. Modern Wolong high-efficiency synchronous systems achieve equivalent thermal safety by minimizing electrical losses. The digital multi-physics simulation of our motor frames optimizes heat dissipation pathways, ensuring that the external casing never reaches the ignition threshold of surround gaseous compounds, even during continuous overload or low-frequency high-torque operational phases.
Authorized global distribution pathway for Wolong Group—a world-class conglomerate combining historic Western motor technology and Chinese high-efficiency manufacturing.
Shaanxi Nanfang Motor Technology Co., Ltd. is the premier authorized partner of Wolong Electric Drive Group Co., Ltd. Established in 1984, Wolong successfully entered the public stock market in 2002 (SH600580). Over nearly four decades, Wolong has scaled its infrastructure to include 3 major manufacturing bases, 39 advanced industrial factories, and 3 high-tech R&D centers globally. Our mission is to combine the engineering heritage of century-old Western brands with the unrivaled agility of China's automated manufacturing sector.
Wolong acquired a 97.94% stake in Austria’s ATB Group, one of Europe’s top three electric motor conglomerates. This brought Morley (nearly 130 years of underground coal mining expertise) and Laurence Scott (specializing in low starting currents and naval combat vessel generators) into our unified design ecosystem.
By bringing Germany's Schorch (est. 1882) and Brook Crompton (venerable pioneer in low and high-voltage energy-efficient designs) under the Wolong umbrella, we secured access to unmatched engineering capabilities in petrochemicals, tunnels, and deep-sea systems.
China's largest scientific research and manufacturing hub for flameproof motors, Nanyang Explosion-proof Group (CNE), officially joined Wolong. This consolidated our capability to build custom motors for nuclear power, military installations, and heavy coal logistics.
Wolong integrated GE’s commercial and industrial motor division. This partnership dramatically boosted our engineering authority in NEMA standard motor production, supporting global mining, metal processing, and massive water treatment facilities.
Detailed insight into the material science and structural modifications that prevent ignition in hazardous industrial operations.
The core of our high-efficiency explosion-proof drives relies on a squirrel cage rotor configuration. For standard low-voltage configurations, we utilize premium centrifugal aluminum casting and advanced die-casting techniques. This melts pure aluminum into the slots of the laminated steel rotor core, creating a monolithic structure with integrated rotor bars and end rings. This process ensures consistent torque, prevents dynamic imbalances, and minimizes air gap friction.
For high-voltage or high-torque operations, we employ copper bar rotors fabricated with precise induction welding and dependable copper bar locking rings. A protective ring design specifically developed for high-speed systems prevents mechanical deformation under centrifugal forces, ensuring long-term operational safety in hazardous mining and conveyor operations.
The stator winding is designed to withstand intense electrical stress and prevent potential internal sparking. Our insulation system uses high-grade polyester film reinforced with premium glass cloth, combined with low-powder and medium-powder mica tape containing rich mica content.
Once the stator coils are wound and placed in the slots, they undergo our high-pressure Vacuum Pressure Impregnation (VPI) cycle. This eliminates any air pockets or moisture within the stator core, filling all voids with high-grade insulating resin. The resulting winding assembly provides excellent dielectric strength, mechanical stability, thermal conductivity, and chemical resistance against corrosive gases in petrochemical facilities.
Our motor frames are built on a digital platform utilizing advanced structural, thermal, and fluid multi-physics simulations. Manufactured from high-tensile cast iron or heavy-welded steel plates, these frames feature excellent structural redundancy and natural frequency isolation margins. This design minimizes resonance issues that could lead to bearing failure or dynamic friction.
The cooling fins are positioned to optimize airflow, preventing hot spots and keeping the outer frame temperature well below the ignition point of combustible gases. The frame's rugged construction allows it to withstand severe mechanical shocks and contain any internal explosion without propagating it to the surrounding environment.
Traditional cooling fans generate significant high-frequency noise and can be vulnerable to debris entry. Our low-noise fan cover system solves this with an integrated fan cover body, an air guide cylinder, a protective window, and silencer plates. The side-entry air inlet bypasses physical obstacles behind the motor, reducing aerodynamic drag and noise caused by air turbulence.
Equipped with specialized sound-absorbing materials, the fan hood reduces overall noise levels by several decibels. The entire assembly meets IP22 protection standards, preventing accidental contact with the rotating fan while ensuring a steady, cool airflow over the motor frame.
Our motors are tested to comply with international regulations, facilitating entry into markets worldwide.
Nemko / ATEX
CSA Standard
CE Mark
CCC Certificate
SABS Approved
TESTSAFE
ISO 9001: Our manufacturing processes adhere to ISO 9001 quality management standards, ensuring reliability and traceability across our production lines.
NEMA Standards: To verify compliance with NEMA mechanical performance specifications, our low-voltage motors undergo efficiency tests, insulation resistance measurements, starting torque checks, and noise/vibration evaluations. These products hold UL and CSA certificates for the North American market.
ATEX & IECEx: Essential for hazardous gas and dust zones in Europe and international markets, these certifications verify that our flameproof (Ex d), increased safety (Ex e), non-sparking (Ex nA), and positive pressure (Ex p) motors meet strict explosive atmosphere regulations.
TESTSAFE: This certification opens up the Australian coal mining market, ensuring our mining machinery complies with local safety requirements.
How our explosion-proof motors serve critical industrial processes around the globe.
Our YQ Series low-voltage marine motors carry full DNV Type Approval, making them suitable for marine vessels and offshore drilling platforms. They are built to withstand high humidity, salt spray corrosion, and vibration, providing reliable power for bilge pumps, steering gear, and deck machinery.
In oil and gas extraction and refining, volatile hydrocarbons present constant explosion risks. Our positive pressure (Ex p) and flameproof (Ex d) motors power large compressors, exhaust fans, and product transfer pumps, maintaining safety in Class I Division 1 and Zone 1 environments.
Underground mining requires robust equipment due to methane gas and fine coal dust. Featuring robust cast-iron frames and optimized insulation, our Morley-branded mining motors are designed to drive heavy conveyors, mine ventilation systems, and slurry pumps under harsh conditions.
Answers to common questions from procurement managers and engineers regarding certifications, mechanical parameters, and custom options.
Flameproof (Ex d) enclosures are designed to contain any internal explosion without letting the flame ignite volatile gases in the surrounding atmosphere. Positive pressure (Ex p) motors maintain a clean air or inert gas pressure inside the casing that is higher than the outside pressure, preventing explosive gases from entering the enclosure in the first place.
We supply Wolong’s variable frequency speed regulation motors (such as the YBBP and BPY-S30 series). These motors are designed to operate with variable frequency drives (VFDs) without experiencing insulation failure or overheating at low speeds, preventing hot spots on the motor body.
Yes. While pneumatic air motors are safe, they are often less energy-efficient. Replacing them with our ATEX/IECEx certified variable frequency electric motors can reduce energy consumption by up to 60% while providing precise digital speed control and real-time system monitoring.
These acquisitions allow us to combine historic European motor engineering with Wolong's automated manufacturing scale. For example, Morley designs mine motors, Schorch focuses on oil and gas projects, and Laurence Scott supplies naval-grade equipment.
We use centrifugal aluminum casting or die-casting for standard motors to eliminate rotor bar voids. For high-speed and large motors, we use copper bar rotors with copper bar locking rings and dynamic balancing to prevent mechanical issues under high centrifugal force.
The windings are insulated with mica tape and undergo Vacuum Pressure Impregnation (VPI) for moisture and thermal stability. We also embed PTC thermistors and PT100 resistance temperature detectors in the windings and bearings to monitor temperatures and trigger shut-offs if thresholds are exceeded.
Our marine-duty motors, such as the YQ series with DNV type approval, use corrosion-resistant coatings, C4 or C5-M grade paints, stainless steel nameplates, and IP56 or IP66 enclosures to protect against salt air and water intrusion.
Yes, we provide custom configurations to match existing footprints. We can adjust shaft dimensions, terminal box locations, foot-mountings (B3, B5, B35), flange dimensions, and voltage parameters to replace legacy equipment with minimal modification.
Explore our high-voltage non-sparking, permanent magnet, and positive pressure motors designed for heavy industrial applications.
NANFANG