High-efficiency low and high voltage industrial asynchronous motors engineered for hazardous areas
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 (stock code: SH600580), Wolong has evolved into an uncontested global giant in motor manufacturing and control systems.
Supported by 3 global manufacturing bases, 39 advanced factories, and 3 global R&D centers, Wolong serves as a strategic innovation partner across key markets worldwide. Our dedication to premium quality, safety integration, and localized customer service sets the benchmark for explosive hazard protection.
LEARN MOREA comparative overview of safety metrics, industrial standards, and explosion protection dynamics
In hazardous industrial environments characterized by explosive gases, vapors, or combustible dust, electric motors pose inherent ignition risks due to potential electrical arcs, mechanical friction, and high surface temperatures. Among the various methods recognized under the IEC 60079 series, Increased Safety "Ex e" stands out as a highly specialized, non-sparking electrical protection topology.
Unlike Flameproof (Ex d) designs which are engineered to contain an internal explosion without allowing the flame front to escape, Increased Safety (Ex e) focuses on prevention. By implementing strict mechanical tolerances, enhanced insulation systems, and optimized electrical air gap clearances, Ex e design guarantees that no hot spot, spark, or arc can manifest under standard operating conditions or specified overload scenarios. This makes Ex e motors significantly lighter, more cost-effective, and easier to service than their bulky Ex d counterparts.
We supply products complying with stringent European Union directive (ATEX), international IECEx standards, and Eurasian Customs Union (EAC) regulations. Our motors are certified for Zone 1, Zone 2, Zone 21, and Zone 22 operations.
Our comprehensive portfolio features IE3, IE4, and leading-edge IE5 permanent magnet synchronous designs. Reducing energy dissipation translates directly to lower carbon footprints and minimal thermal release in hazardous operations.
From low voltage variable frequency speed motors to multi-megawatt high voltage positive pressure machines, our catalog accommodates oil refineries, marine platforms, mining shafts, and chemical processing facilities.
Leveraging century-old industry engineering giants to build the ultimate safety ecosystem
Wolong Group’s growth has been fueled by targeted strategic acquisitions of global motor manufacturers. By consolidating the IP, manufacturing capacities, and testing standards of these iconic European and American brands, Shaanxi Nanfang Motor Technology provides global buyers with unrivaled engineering authority.
Acquired in 2011, ATB is a European market leader. Specializing in high-power mining and petrochemical motors, ATB integrates Morley and Laurence Scott brands under its umbrella.
With over 110 years of expertise, Brook Crompton is renowned for high-performance low voltage motors. Their flagship "W" series sets the industry standard for durability in harsh environments.
Established in Germany in 1882, Schorch delivers heavy-duty drive systems for pipelines, shipping vessels, and heavy chemical plants with unparalleled high-voltage expertise.
Joined Wolong in 2018, reinforcing our portfolio with NEMA standard motors. This merger provides critical support for North American markets and specialized offshore platforms.
Evaluating the unique combination of manufacturing scale, supply-chain agility, and premium quality control
At our Nanyang production base (the largest explosion-proof motor research and manufacturing center in China), we control everything from silicon steel stampings, wire drawing, and casting, to stator winding and high-voltage testing. This minimizes external lead times and ensures quality control.
Our modern lines utilize CNC stator-core winding equipment, automated Vacuum Pressure Impregnation (VPI) installations, and robotic welding setups. This guarantees that mechanical tolerances in our explosion-proof air gaps remain consistent down to the micrometer level.
Our factory processes conform fully to ISO 9001 and IECEx OD 005 (Explosion Protection Quality System). This alignment enables us to issue dual-certified ATEX/IECEx products directly from our lines, reducing secondary import overheads for global project buyers.
How our advanced mechanical components assure explosion-proof safety and thermal efficiency
Our rotors feature a robust squirrel-cage design. For standard applications, centrifugal or high-pressure die-cast aluminum rotors are utilized, integrating end rings and cooling fins. For heavy-duty high-voltage installations, copper bar rotors are used. This option features advanced brazing, custom end-ring profiling, and high-speed retaining rings that prevent rotor bar displacement under start-up load transients.
Our stator insulation comprises high-grade polyester film backed with glass cloth and high-mica-content tapes. Using state-of-the-art Vacuum Pressure Impregnation (VPI), we eliminate any internal voiding or moisture pocketing. The resulting winding structure offers excellent mechanical strength, structural durability, resistance to chemical corrosion, and superb thermal dissipation properties.
Our motor housing employs a digital design framework utilizing advanced finite element analysis (FEA) and fluid dynamics (CFD) simulation tools. Cast in premium grade grey cast iron or fabricated steel plates, the frames feature integrated structural ribbing to maximize surface area and cooling. The casing provides high structural rigidity to endure high impact shock loads while preventing structural resonances.
Comprising a custom engineered shroud, air-guide cylinder, safety window, and internal silencer, our fan hood design delivers high volume cooling air while reducing high frequency noise levels. The dynamic air intake pathway prevents debris accumulation. Rating at IP22 to IP55, it guarantees no mechanical contact with the rotating fan blade, conforming to safety codes.
Our explosion-proof systems are authorized and approved for deployment by regulatory bodies globally
Compliance is the foundation of industrial hazard protection. Shaanxi Nanfang Motor Technology distributes motors that undergo rigorous performance verification and safety testing. This rigorous testing enables our systems to satisfy key regulatory frameworks, overcoming technical trade barriers.
Nemko / ATEX
CSA
CE
CC (CCC Ex)
SABS
TESTSAFE
ISO 9001 Standard: Our factories comply with the ISO 9001 quality framework, establishing a documented line of traceability from raw steel coils to the final testing bay.
NEMA Standards: For our North American partners, our low and medium voltage motors are certified to NEMA MG1 specifications. These motors are UL and CSA certified, and undergo rigorous tests including efficiency validation, insulation breakdown resistance, starting torque, and vibration checks.
IECEx and ATEX Compliance: Essential for European and global offshore applications. Every Ex e motor design undergoes thermal runaway tests, flame path checks, dust ingress protection verification, and impact safety analysis.
TESTSAFE Standard: This standard enables us to distribute specialized explosion-proof mining motors in Australia and the broader Oceania region, confirming our capability to meet tough deep-shaft mine criteria.
Step inside our state-of-the-art testing bays, rotor assemblies, and production areas
Solving extreme challenges across the world's most demanding operating zones
Explosion-proof motors are safety-critical assets in modern infrastructure projects. Depending on the geographical zone and local regulatory environment, the demand for Ex e and other flameproof motors varies, requiring deep engineering expertise to solve site-specific difficulties:
Decarbonization, predictive maintenance, and next-generation smart drives
The industrial landscape is transforming rapidly under the influence of global carbon neutrality mandates and Industry 4.0 digitalization. Explosion-proof motor design is evolving along three key trends:
1. IE5 Ultra-Efficiency & Permanent Magnet Technologies: Traditional induction motors lose efficiency at low speeds. By integrating rare-earth permanent magnet rotors, our newer series (like the TBVF series) achieve IE5 efficiency. This reduces operating costs, decreases winding temperatures, and extends the motor's operating life.
2. Smart Ex Sensors & Real-time Edge Diagnostics: Historically, inspecting motors in Zone 1 environments required costly shutdowns. Modern Ex motors integrate certified vibration and temperature sensors (such as our OLI-compatible Ex sensors). These transmit real-time telemetry over wireless protocols to predict bearing failures before they occur.
3. Variable Frequency Drive (VFD) Optimization: Designing explosion-proof motors for VFD operation requires special insulation systems to resist high voltage spikes (dv/dt). Our BPY and YBBP series are engineered for variable speed duty, incorporating insulated non-drive end bearings to eliminate destructive shaft currents.
Important design and compliance considerations answered by our chief applications engineering team
Specialized water-pump, flameproof, variable frequency, and high-efficiency standard AC motors
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