Explore our high-performance, certified solutions engineered for Zone 1, Zone 2, Zone 21, and Zone 22 applications globally.
Modern process automation in hazardous locations demands more than just robust casing. The global transition towards the Industrial Internet of Things (IIoT), real-time efficiency analytics, and highly volatile operating conditions has positioned Explosion-Proof Variable Frequency Drives (VFDs) and compatible explosion-proof synchronous/asynchronous motors as critical infrastructure assets.
In high-risk chemical processing, deep-shaft mining, offshore drilling, and refinery setups, speed regulation cannot compromise functional safety. Legacy fixed-speed systems are rapidly being phased out. Operating pumps, fans, compressors, and conveyors with high-voltage VFDs allows operators to adjust pressure and flow smoothly, reducing systemic mechanical stress, mitigating water-hammer occurrences, and generating massive energy savings (often exceeding 30%).
However, running an explosion-proof motor on a VFD induces high-frequency voltage harmonics, steep voltage rises (dV/dt), and potential shaft currents. Selecting an experienced exporter that understands this electromagnetic symbiosis is paramount. The system must meet strict global standards—ranging from Europe's strict ATEX directives, global IECEx parameters, North American NEMA configurations, to regional regulations like EAC (CU-TR) in Eurasia.
Authorized Global Distributor of Wolong Electric Drive Group. Integrating the World’s Leading Motor Brands and Control Systems to Drive Heavy Industrial Safety.
Shaanxi Nanfang Motor Technology Co., Ltd. is the premier authorized distributor of Wolong Electric Drive Group Co., Ltd. Founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (code SH600580), Wolong has grown to become the world's preeminent motor manufacturer. With 3 world-class corporate R&D centers, 39 advanced manufacturing bases, and 3 global production hubs, Wolong has solidified its footprint across key international markets, offering unrivaled control systems and motor technologies.
How Shaanxi Nanfang Motor and Wolong Electric Integrated A Century of Global Motor Expertise.
ATB (Austria)
Acquired 2011, 3 Major European bases
Brook Crompton (UK)
100+ Years Legacy, High-Efficiency
Schorch (Germany)
Est. 1882, High-Voltage Systems
OLI (Global/China)
Industrial Vibrating Technology Leader
GE Industrial Motors
Joined in 2018, North American StandardIn 2011, WOLONG company obtained profound technical, topological, and product patents by acquiring 97.94% of the Austrian ATB Group, which placed them in direct control of three major European motor manufacturers. ATB’s portfolio contains industry legends such as Morley and Laurence Scott.
Morley Motors, with its nearly 130-year history, is the global hallmark of flameproof and Ex-proof machinery in underground coal extraction. Laurence Scott, celebrated for supplying low starting-current systems to British nuclear facilities and generators to the Royal Navy, has garnered the prestigious Queen's Award for Enterprise for three consecutive years.
Similarly, Brook Crompton Motors integrated its comprehensive low, medium, and high voltage AC motor designs, including the W and 10 series, under the Wolong banner. Further strengthening their foothold in German heavy industries, Schorch Motors (established 1882) joined the collective, delivering high-spec driver configurations for global oil & gas pipelines, petrochemical refineries, and marine test beds.
Furthermore, in 2015, China’s largest and most advanced explosion-proof motor scientific R&D institution, Nanyang Explosion-Proof Group (CNE), formally joined Wolong. CNE’s technology dominates the domestic coal, petrochemical, and nuclear power plant auxiliary systems.
The acquisition of the General Electric (GE) commercial and industrial motor division in 2018 completed Wolong's global reach, combining GE's massive legacy engineering archives in oil & gas, metallurgy, and material processing with Wolong's state-of-the-art lean manufacturing lines.
Through this integration, Shaanxi Nanfang Motor Technology Co., Ltd. delivers system design capabilities that seamlessly bridge Chinese supply chain efficiency with European and American engineering specifications.
Why Procurement Managers Globally Prefer Partnering with China's Premier VFD Exporters.
China houses the most integrated supply chain for rare-earth metals, high-grade silicon steel sheet laminations, high-conductivity copper windings, and advanced semiconductor modules. This eliminates international raw material transit lags and buffers against global supply chain volatility.
By executing advanced automated production processes (VPI lines, computerized winding arrays, static and dynamic balancing, and integrated multi-physics laboratory testing) at massive scale, we drastically lower the unit production cost of high-voltage and flameproof motor units.
Unlike rigid Western manufacturing setups, Chinese factories are structured for highly agile product engineering. Whether it is adjusting mounting dimensions, adding custom RTD sensors, using specialized paint for extreme offshore corrosion resistance, or modifying VFD cabinet layouts, lead times are kept minimal.
A closer look at how Wolong motors achieve world-class thermal, electrical, and mechanical reliability.
Our rotors feature premium squirrel cage designs. For lower range outputs, cast aluminum rotors are built using centrifugal casting or advanced die-casting techniques. The molten pure aluminum is injected into the rotor core slots under pressure, producing a robust, single-piece structure integrating both bars and end rings. For large-capacity motors, copper bar rotors are utilized, incorporating advanced induction brazing to secure structural integrity. High-speed models are equipped with custom retention rings to counter centrifugal load stresses and prevent rotor deflection.
The motor coils are crafted from polyester film reinforced with glass cloth, using low-powder mica tape or medium-powdered mica tape with a high mica content. After the stator cores are wound and checked, they undergo the Vacuum Pressure Impregnation (VPI) process. Under intense vacuum and pressure, high-grade resin penetrates all voids in the stator coils. The cured structure delivers exceptional dielectric strength, mechanical stiffness, resistance to humidity, and Class F/H thermal margins, shielding the motor against the high voltage spikes of VFD control.
The motor frame is designed using fully digital simulations analyzing structural, thermal, and fluid dynamics fields. Utilizing mature high-strength cast iron (or structural steel for bespoke requirements), the frame boasts high physical stiffness, exceptional heat dissipation surface profiles, and sufficient natural frequency margins. The result is a structural setup that handles external mechanical shock, maintains ultra-low vibration levels, and ensures the motor runs cooler, extending bearing and grease life cycles.
Our low-noise fan cover system consists of a dynamic fan cover body, an air guide cylinder, an inlet mesh protective window, and internal sound-absorbing panels. The compact design reduces overall vibration. The air intake is located on the side, circumventing blockages behind the motor housing and minimizing power-robbing turbulence. The incorporation of sound-absorbing materials drastically reduces fan noise without restricting air flow. Rated to IP22/IP55, the fan cover ensures complete protection against contact with the rotating blades.
Eliminating International Trade Barriers and Guaranteeing Industrial Compliance in Extreme Hazardous Settings.
Our entire low and high-voltage explosion-proof motor product family has achieved Nemko/ATEX and IECEx compliance. We meet Directive 2014/34/EU criteria for safe application in combustible gas, vapor, mist, and dust clouds across diverse industrial sectors.
To confirm compatibility with North American grids and hazardous environment classifications (Class I Div 1/2, Class II Div 1/2), our electric motors undergo testing for insulation resistance, torque profiles, thermal limits, and are certified under UL and CSA standards.
All motors bear CE markings signifying compliance with health, safety, and environmental protection standards. We also meet China's CCC requirements, representing safe operation and low-emission engineering.
TESTSAFE is the leading certification authority in the Southern Hemisphere. Our TESTSAFE and SABS certifications enable Shaanxi Nanfang Motor to supply explosion-proof underground coal mining systems directly to Australia and South Africa.
Our VFD and explosion-proof motor systems operate under the most grueling conditions worldwide.
Providing heavy-duty, flameproof conveyor, ventilation, and water pump motors (YB3, YBK3 series) configured for ATEX M2 and Ex d I Mb ratings, capable of handling high concentration of coal dust and methane gas safely.
Speed control on high-pressure pumps and gas compressors. Our VFD-driven Ex-d, Ex-de, and positive pressure Ex-p systems prevent arcing or thermal buildup, mitigating risks in gas zones 1 and 2 (Group IIA, IIB, IIC).
Built with marine-grade C5-M anti-corrosion paint coatings, stainless steel shafts, and specialized heating elements to counter moisture buildup, ensuring remote offshore operations remain continuously active.
The industrial drive landscape is seeing rapid advancements aimed at higher safety margins and lower energy waste:
Guidelines for Engineering and Procurement Directors sourcing integrated Ex-proof Motor and VFD systems.
Strictly verify if the installation location requires Class I (Gas), Class II (Dust), Division 1/2, or Zone 0/1/2/20/21/22 ratings. Make sure to specify the temperature class (T1-T6) based on the auto-ignition points of ambient vapors.
Always source the VFD and motor as a matched system. Voltage spikes (dV/dt) from PWM drives can degrade winding insulation. Incorporating output reactors, dV/dt filters, or sinus filters is essential for cable lengths exceeding 50 meters.
Ensure your supplier performs load testing, thermal checks at low frequencies, VPI verification, and insulation resistance checks before shipment. Always request official ATEX/IECEx test certificates.
Authoritative technical answers to common queries regarding Explosion-Proof VFDs and motors.
Complete your industrial drive chain with our high-power synchronous and asynchronous motor lines.
NANFANG
