Engineered for hazardous zones, severe duty environments, and high-performance industrial drive applications.
The global transition towards low-carbon industrial manufacturing has repositioned 3-phase induction motors from simple workhorses to sophisticated energy-efficient drive units. Industrial automation, chemical processing, mining conveyor systems, and fluid transport infrastructure account for more than 40% of the world's electricity consumption, placing high-efficiency motor technology at the center of carbon reduction frameworks.
With regulatory bodies in Europe, North America, and APAC tightening efficiency minimums (IE3 and IE4 transitions, heading towards IE5 permanent magnet synchronous configurations), modern heavy industries face the challenge of upgrading drive infrastructure without compromising on mechanical footprints and hazardous zone safety. High-voltage (HV) and low-voltage (LV) explosion-proof motor systems now demand advanced thermal performance, robust enclosures, and digital simulation validation to withstand heavy continuous operational profiles.
At Shaanxi Nanfang Motor Technology Co., Ltd., we bridge this operational gap. Through our authorized distribution of Wolong Electric Drive Group, we deliver advanced metallurgical design, VPI insulation technology, and precision-engineered rotor assemblies to the world's most demanding environments.
Shaanxi Nanfang Motor Technology Co., Ltd is the authorized global distributor of Wolong Electric Drive Group Co., Ltd.
Why Tier-1 industrial enterprises specify Wolong solutions for major drive systems.
Our complete range of hazardous area motors boasts certificates across Ex-db, Ex-eb, and Ex-tb configurations, complying with standard safety profiles required in North America, Europe, Australia, and Russia.
We supply advanced permanent magnet synchronous motors (PMSM) and ultra-high efficiency asynchronous induction platforms, reducing operational losses and energy consumption across high duty cycles.
Supported by 39 factories and local engineering networks globally, Shaanxi Nanfang Motor provides customized technical support, frame size drop-in replacements, and commissioning assistance.
Wolong operates localized technological centers in Europe (Austria and Germany), China, and Japan, alongside a Central Research Institute in Shanghai. This multi-region collaboration develops next-generation insulated bearings, low-current startup control strategies, and complex fluid-thermal simulations. Our engineering teams utilize digital platforms to model stress distributions, magnetic field paths, and airflow dynamics, ensuring that our final customized industrial motors maintain structural reliability and low noise emissions.
Wolong motors comply with leading international quality systems and explosion-proof regulatory frameworks.
Nemko / ATEX
CSA
CE Mark
CCC
SABS
TESTSAFE
ISO Standards Compliance: Wolong manufactures under ISO 9001 certified quality control processes, ensuring traceable material certificates, testing steps, and consistent production parameters for all Ex motor structures.
NEMA Performance Standards: For mechanical configurations used in North American markets, our low-voltage electric motors undergo standard testing including efficiency verification (per IEEE 112B method), insulation resistance testing under temperature stress, starting torque profile validations, and vibration testing. This ensures full certification under UL and CSA standards.
IECEx and ATEX Directives: Our heavy-duty motors carry extensive EU-type examination certificates for hazardous environments. This simplifies local compliance processes for project engineering teams integrating our drives into offshore platforms and gas pipelines.
TESTSAFE Certification: By securing TESTSAFE certification (the primary coal mining equipment testing body in the Southern Hemisphere), Wolong provides coal mine underground motors that comply directly with Australian regulations, enabling seamless project execution in Oceania and South American mineral extraction corridors.
Inside the high-reliability stator, rotor, frame, and cooling assemblies.
Our squirrel-cage rotors utilize centrifugal cast-aluminum and high-pressure die-cast construction. Molten pure aluminum is poured into the slots of the laminated steel rotor core, forming a unified component that integrates the rotor bars and end rings. This construction provides high structural stability and excellent startup torque characteristics. For heavy-duty industrial systems, we employ copper-bar rotors with welded end-rings, featuring containment structures for high-speed variable frequency applications.
Our stator windings utilize high-purity copper conductors wrapped in polyester film-reinforced glass tape or premium high-mica content insulation tape. After the winding phase, the complete stator core is subjected to the VPI (Vacuum Pressure Impregnation) process to eliminate voids and moisture. This creates a solid resin-insulated winding system that provides high dielectric strength, mechanical stability under electromagnetic load changes, and moisture resistance.
Using digital multi-physics simulation tools, the motor frame is optimized for thermal dissipation and natural frequency isolation. Cast from high-tensile strength cast iron (or structural steel for custom configurations), the frame withstands external mechanical shocks, reduces overall vibration levels, and maintains low thermal gradients across the motor structure.
The cooling assembly consists of a fan cover, air guide, protective screen, and acoustic damping plates. Featuring a side-inlet design that minimizes airflow obstruction when positioned close to walls, the fan reduces acoustic emissions by changing sound wave propagation paths. Rated to IP22/IP55, the hood prevents foreign objects from contacting the internal cooling blades.
Powering heavy industry, municipal water, marine propulsion, and petrochemical refineries worldwide.
Driving high-pressure compressors, fluid transfer pumps, and process air coolers in refining complexes. Fully explosion-proof constructions (Ex db / Ex eb) ensure operations in zone 1 and zone 2 gas atmospheres.
Supplying conveyor drives, coal crushing mills, and underground ventilation fans with high starting torque, dust protection (Ex tb), and resistance to transient electrical overloads.
Powering regional municipal water supply pumps, stormwater pump systems, and industrial wastewater treatment aeration fans with variable-frequency speed control packages.
Powering auxiliary generators, electric outboard propulsion drives, and heavy ballast pumps, featuring saltwater-resistant paint systems and vibration isolation compliance.
Driving the digital transformation of electrical machines and power systems.
The integration of Internet of Things (IoT) sensors directly into motor housings marks the next phase in industrial reliability. Future drive systems utilize real-time vibration, temperature, and current signal analysis to diagnose stator winding degradation, bearing wear, and misalignment prior to unplanned shutdowns.
Wolong's development focus includes integrated variable-frequency drives (VFD) that coordinate with smart grid operations, allowing motors to optimize performance based on real-time power fluctuations. This minimizes mechanical stress, reduces reactive power consumption, and increases overall system longevity.
Furthermore, research in permanent-magnet configurations aims to minimize dependence on rare-earth materials by exploring advanced synchronous reluctance (SynRM) platforms, ensuring sustainability and high performance across a wide range of operating speeds.
Insights from our application engineers regarding design specifications, certifications, and operational parameters.
Ex db (flameproof) motors are designed with a heavy enclosure capable of containing an internal explosion without transmitting the ignition to the surrounding explosive atmosphere. The joints are precision flamepaths that cool escaping gases. Ex eb (increased safety) motors focus on preventing the generation of sparks, arcs, or excessive temperatures during normal operations, using enhanced insulation materials and larger air gap clearances between components.
The VPI process extracts air and moisture from the stator winding insulation package under vacuum, replacing it with a high-solids resin under pressure. This eliminates air voids inside the insulation layers, reducing partial discharges and improving heat transfer from the coils to the iron core. This treatment helps lower hot-spot temperatures and increases the motor's operating lifespan.
Yes. Motors designated for variable frequency operation (such as the Wolong YBBP and YBBPX series) are designed with insulated non-drive end bearings to prevent shaft currents from damaging the bearing elements. Additionally, they feature stator insulation suited for VFD voltage rise times (dv/dt) and auxiliary cooling fans that maintain adequate ventilation at low operating speeds.
We verify electrical efficiency using the IEEE 112 Method B dynamometer test, which measures output torque, electrical power inputs, and stator winding heat losses, while calculating stray load losses. We also monitor insulation resistance, startup current limits, and vibration levels to ensure complete alignment with NEMA MG1 requirements.
The inclusion of ATB and Schorch integrates over a century of European engineering expertise into the Wolong production system. This allows us to manufacture bespoke driving packages, custom low-vibration machines, high-output-density HV motors, and specialist marine propulsion systems using validated European design methodologies and certified manufacturing facilities globally.
High-voltage variable speed motors, brushless excitation synchronous platforms, and high-efficiency AC drives.
NANFANG
