In modern heavy industries, the demand for High-Voltage Explosion-Proof (HV Ex) Motors has surged dramatically. These machines are the heart of safety-critical operations, performing tirelessly in environments filled with combustible gases, volatile dusts, and extreme temperatures. Today, heavy industries globally are transitioning toward higher efficiency classes (IE3, IE4, and IE5) to comply with stringent environmental legislation and mitigate carbon footprints.
Undergoing complex operations in oil & gas refineries, offshore drilling platforms, chemical manufacturing complexes, and deep underground coal mines requires motors that provide massive torque while ensuring absolute prevention of internal sparks escaping into the environment. The CE Certification acts as a vital passport, confirming that these heavy-duty systems comply with European Union directives including ATEX, alongside the international standard framework of IECEx.
Shaanxi Nanfang Motor Technology Co., Ltd. is the authorized global distributor of Wolong. Founded in 1984, Wolong Electric Drive Group Co., Ltd. was successfully listed on the Shanghai Stock Exchange in 2002 (code: SH600580). Over nearly four decades of structural scaling and industrial innovation, Wolong has established 3 major manufacturing bases, 39 individual state-of-the-art factories, and 3 premier R&D centers worldwide.
The group focuses heavily on the design, production, and supply chain management of advanced electric motors and smart drive control systems. Committed to a comprehensive global brand strategy, Wolong has secured its position as an international leader in technical processes, R&D capability, and global sales reach.
Learn More About Our OperationsWe provide comprehensive Ex certification options tailored to your distinct geographical and regulatory markets, including European ATEX, International IECEx, North American CSA, and Eurasian EAC (CU-TR).
Equipped with custom winding styles, we provide IE3, IE4, and advanced IE5 performance standards. This includes permanent magnet synchronous motors (PMSM) configured to reduce dynamic heat loss.
Our exhaustive portfolio covers low-voltage asynchronous units, high-voltage positive pressure type motors, and water-cooled explosion-proof frequency adjustment speed regulation systems.
Establishing world-class motor engineering research centers in Germany, Japan, Austria, and Shanghai to spearhead innovation in VFD-controlled topologies.
Integration of legendary brands including Brook Crompton, ATB, Morley, Laurence Scott, and Schorch to harness century-long engineering expertise.
State-of-the-art domestic production facilities (Nanyang Explosion-Proof base) delivering reliable flameproof housings (Ex d) and increased safety frameworks (Ex e).
Why do major international engineering procurement teams repeatedly turn to China for High-Voltage Ex Motors? The reasons extend far beyond initial cost parameters. It lies in China's highly integrated supply chain ecosystem. At the Wolong production bases, we combine advanced digital production lines, automated coil winding arrays, and high-performance Vacuum Pressure Impregnation (VPI) equipment. This high degree of automation ensures consistent insulation quality across high production volumes.
Furthermore, our factories leverage local access to premium electrical steel laminations and ultra-pure electrolytic copper. This secure materials stream enables us to maintain shorter lead times and adapt designs to custom shaft configurations or extreme environmental setups, ensuring rapid dispatch to international ports.
In 2011, Wolong acquired 97.94% of the Austrian ATB Group, positioning itself alongside the leading three motor manufacturing entities in Europe. Through the acquisition, the group incorporated specialized brands such as Morley and Laurence Scott. Morley holds a 130-year legacy of engineering excellence in underground coal mining equipment, while Laurence Scott remains a pioneer in producing low-starting-current generators and machinery for marine and nuclear power plants.
Over the following decade, this footprint expanded further. Brook Crompton brought a century of design expertise in low, medium, and high-voltage energy-efficient motors, leading to the development of the "W" and "10" series. Schorch (acquired in 2011) brought a legacy dating back to 1882, providing heavy-duty drive systems for petrochemical and steel processing plants. These integrations were further bolstered by acquiring GE Industrial Motors in 2018 and partnering with OLI vibration motors.
Based in Austria, ATB delivers premium European-engineered solutions for the global oil, chemical, and heavy processing sectors.
Heavy-duty underground mining motors engineered to withstand severe physical impacts and combustible coal-dust environments.
Specialist in customized electric motors with low starting currents, designed for critical infrastructure and marine applications.
Specializing in energy-efficient low, medium, and high-voltage AC motors.
Heavy industrial drive systems for petrochemical and municipal water management.
China's premier base for explosion-proof research and development.
Acquired commercial and industrial range supporting petrochemical and heavy manufacturing.
With the combined engineering heritage of GE, Brook Crompton, ATB, and Schorch, Wolong has streamlined its global production protocols. Whether your application requires dynamic NEMA-compliant frame dimensions or standard metric-base IEC housings, our integrated production lines can execute and deliver them.
This collaborative framework allows Shaanxi Nanfang Motor to supply products globally, backed by professional localized technical support. We assist engineering offices during the feed stage and provide remote support during final commissioning.
Take a visual tour inside our advanced machining centers, automatic impregnation lines, and stator winding facilities. Each facility is managed under ISO 9001 and strictly conforms to ATEX/IECEx quality assurance protocols.
Industrial equipment operating in hazardous environments must conform to strict local safety certifications. In contrast to standard machinery, explosion-proof motors undergo rigorous audits, casing pressure testing, flamepath gap checks, and static temperature evaluations.
Nemko / ATEX
CSA Group
CE Compliance
CCC Mark
SABS Africa
TESTSAFE
Understanding the interior components of high-voltage explosion-proof motors demonstrates their engineering quality. Below is a detailed view of the stator, rotor, frame, and cooling systems that enable reliable operation under severe duties.
We employ robust cast aluminum or welded copper bar squirrel-cage structures. The cast aluminum rotors are manufactured using high-pressure centrifugal casting to eliminate internal gas voids, ensuring balanced current distribution.
For higher kilowatt capacities, we employ customized copper bar configurations. The bars are joined to the end rings using high-frequency silver induction welding to withstand dynamic starting torque, while high-speed applications incorporate containment rings to maintain physical integrity.
Our stators utilize Class H insulation components wrap-insulated with premium mica tape. Following core insertion, the stator assembly undergoes a full Vacuum Pressure Impregnation (VPI) cycle.
This VPI process forces solventless resin to penetrate all voids within the winding pack. This creates a solid, moisture-resistant insulation structure that provides mechanical support and helps prevent localized electrical discharges.
The external frames are designed using finite element analysis (FEA) to withstand high mechanical shocks and pressure differentials. Cast in high-tensile iron or fabricated steel, they offer robust structural stability.
The frame designs feature optimized cooling fins to maximize airflow heat dissipation. This configuration minimizes frame vibration and maintains the rotor within tight operating tolerances.
To lower ambient noise levels, our motors incorporate sound-attenuated fan covers. These designs feature internal aerodynamic baffles and high-performance sound-absorbing materials.
The air inlets are positioned to reduce turbulence and energy losses, helping to lower operating noise. The fan hoods conform to IP22 specifications, preventing external particulate contact with the fan.
Our explosion-proof high-voltage motor portfolio is deployed globally, driving critical process equipment in severe-duty environments.
Designed for offshore platforms and onshore refineries, these motors drive feed pumps, seawater injection systems, and gas compressors under ATEX/IECEx Zone 1 and Zone 2 safety directives.
Engineered to resist corrosive vapours and volatile gases. Positive pressure enclosures (Ex p) prevent ambient chemical mixtures from penetrating the stator frame.
Designed to meet MSHA and TestSafe specifications, these motors power continuous miners, underground ventilation fans, and heavy-duty conveyor systems in dust-heavy coal mining operations.
NANFANG
