Explore our premium catalog of high-efficiency flameproof and increased-safety AC motors developed for high-voltage operational stability and safety compliance.
Shaanxi Nanfang Motor Technology Co., Ltd. is the authorized global distributor of Wolong Electric Drive Group Co., Ltd. Wolong, established in 1984 and listed on the Shanghai Stock Exchange in 2002 (code SH600580), has spent over three decades transforming into the definitive world leader in motor manufacturing and advanced drive control systems.
With 3 key manufacturing bases, 39 state-of-the-art factories, and 3 global R&D centers, Wolong drives high-end technical advancements in China, Europe, and Japan. Our strategic path has merged renowned global motor brands, consolidating a comprehensive industrial motor portfolio designed to fulfill standard, customized, and hazardous operational demands globally.
Bringing century-old engineering lineage into modern applications. From Morley's mining expertise to Laurence Scott's nuclear designs and GE's heavy industrial power, our integrated solutions have established a standard of excellence.
Rotor dynamic, structural mechanical, and fluid thermal calculations are simulated on unified digital platforms to guarantee mechanical longevity and heat dissipation performance.
In-house certification tests check full load capacity, sound levels, high-frequency harmonics, and thermal saturation bounds under strict explosive simulator parameters.
How technical developments, safety compliance requirements, and decarbonization strategies are transforming next-generation drive designs.
Industrial operations are increasingly focused on improving energy efficiency. High-voltage explosion-proof motors are moving beyond traditional IE3 efficiency classes toward IE4 and IE5 super-premium efficiency standards. Manufacturers achieve this by optimizing stator slot shapes, reducing windage loss, and using high-grade silicon steel sheets to lower magnetic core losses.
Modern explosion-proof systems are evolving into smart, connected devices. Integrated explosion-proof vibration sensors, thermal couplers, and air pressure gauges continuously stream operating data to centralized plant control systems. AI-driven predictive maintenance platforms analyze these data signatures, allowing operators to schedule maintenance before structural faults occur, reducing costly plant downtime.
International chemical, petrochemical, and oil exploration initiatives require unified compliance standards. Procurement teams demand motors that carry both ATEX (Europe) and IECEx (International) certifications. Multi-certified motors streamline safety audits and reduce the engineering overhead of managing regional variations across global project sites.
Our core technical design principles ensure reliable performance, mechanical integrity, and high explosion safety standards.
Rotor System: Features a rugged squirrel cage design utilizing cast aluminum or high-performance copper bars. The centrifugal aluminum casting and precision die-casting techniques unify the rotor bars and end rings into a single, cohesive component. This structure ensures high torsional strength, thermal resilience, and optimal starting torque characteristics.
Stator Insulation: Coils are wrapped with high-mica content tape, layered with glass cloth, and insulated with premium polyester film. The complete assembly undergoes a rigorous Vacuum Pressure Impregnation (VPI) process, resulting in a dense insulation barrier. This design provides reliable electrical resistance, mechanical strength, and moisture-proofing, qualifying it for high-temperature and harsh industrial applications.
Motor Frame Structure: Our motor frames are engineered using digital platforms that simulate fluid and multi-physics structural fields. Cast from high-strength cast iron or structural steel, they provide structural redundancy and vibration damping. This design handles external mechanical impacts while optimizing thermal paths to minimize local hot spots.
Optimized Ventilation: The low-noise fan system features an aerodynamic air guide cylinder, protective windows, and silencer plates. The side-entry air intake minimizes turbulence and flow losses. Combined with integrated sound-absorbing materials, the system reduces operating noise while maintaining an IP22 rating to prevent direct contact with rotating components.
Key financial and operational considerations for engineering procurement managers when selecting high-voltage, explosion-proof motors.
Selecting an explosion-proof motor involves analyzing more than just the initial purchase price. The overall value is defined by the Total Cost of Ownership:
Energy Efficiency Savings: Because high-voltage motors operate continuously in critical industrial processes, a 1% increase in energy efficiency can lead to significant cost savings. Over a typical 15-year operational lifespan, energy costs can account for more than 90% of the motor's total cost of ownership.
How Wolong has integrated centennial motor brands and global expertise to build a leading technical foundation.
WOLONG has pursued a global branding strategy by acquiring established, industry-leading motor manufacturers. These strategic partnerships have integrated centuries of engineering expertise into our current product lines:
Wolong acquired 97.94% of the Austrian ATB Group, which includes the Morley mining motor brand and Laurence Scott. This acquisition expanded Wolong's capabilities in heavy-duty mining and nuclear power applications.
Founded in 1882, Schorch joined Wolong. Their experience in drive systems for the oil, gas, and chemical industries strengthened Wolong's presence in high-voltage petrochemical applications.
CNE, one of China's largest explosion-proof motor research and manufacturing bases, joined Wolong. This partnership strengthened the group's manufacturing capacity and technology base for explosion-proof applications.
Wolong acquired GE's commercial and industrial motor business. This integration brought GE's design standards, quality systems, and industrial experience in North America into the Wolong Group.
Our motors are tested and certified to comply with international explosion-proof standards and safety guidelines.
How our engineering solutions address the specific environmental and operational challenges of different industries.
Our motors are designed for offshore drilling rigs, pipelines, and refinery environments. Options include flameproof (Ex d), increased safety (Ex e), and pressurized (Ex p) enclosures that handle ambient temperature swings, saline corrosion, and explosive atmospheres.
Designed for coal face conveyors, shearers, and ventilation fans. Our mining motors use thick-walled cast iron construction to resist impact damage, dust accumulation, and damp conditions, keeping critical mine systems running reliably.
We build specialized motors for cooling water pumps, boiler feed pumps, and auxiliary draft fans. These systems are engineered to run reliably during voltage fluctuations and carry certifications for safety-critical nuclear installations.
Our development pipeline focuses on three key design areas to meet the changing needs of global industries:
Technical guidance and answers for engineers and procurement managers.
An Ex d (flameproof) motor is designed with an enclosure strong enough to contain an internal explosion without damage. It prevents the internal flame from escaping and igniting explosive gases in the surrounding environment.
An Ex e (increased safety) motor focuses on prevention. It uses tight design tolerances to prevent sparks, arcs, and excessive temperatures from occurring during normal operation, making it suitable for Zone 2 environments where explosive gases are rarely present.
The VPI process extracts air and moisture from the stator windings under vacuum, then forces solventless insulating resin into the coil structures under high pressure. This eliminates air voids, improving the motor's dielectric strength, mechanical rigidity, heat dissipation, and resistance to environmental moisture.
Ex p motors maintain a continuous positive pressure of clean air or inert gas inside the enclosure. This overpressure prevents surrounding explosive gases or dust from entering the housing. If the internal pressure drops below the minimum safe threshold, integrated pressure monitoring systems trigger an alarm or shut down the motor.
Global testing is guided by the IEC 60079 series for explosion-proof equipment and IEEE 112 / IEC 60034 for electrical and thermal performance. These protocols cover flame path tolerances, enclosure pressure containment, temperature rise limit tests, and efficiency measurements.
Explore our additional line of certified flameproof conveyor motors, dust-proof induction systems, and specialized industrial drives.
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