Explore our premium range of industrial high-efficiency explosion-proof and three-phase asynchronous motors engineered for hazardous areas.
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).
With over 35 years of dedicated focus on motors and control systems, Wolong operates 3 manufacturing bases, 39 state-of-the-art factories, and 3 global R&D centers. Through a persistent global brand strategy, Wolong has solidified its leadership position in R&D, safety engineering, advanced manufacturing, and global distribution of explosion-proof electrical machinery.
Explore Company ProfileGlobal R&D Centers: Strategically situated across China, Europe, and Japan, with a central research institute located in Shanghai.
Acquired Heritage Brands: Includes ATB, Schorch, Brook Crompton, Morley, Laurence Scott, and OLI Vibration Motors.
Strategic Partner: Key global industrial partner with General Electric (GE) industrial motor division since 2018.
Unlocking technological growth and safety compliance in hazardous industrial operations.
We manufacture equipment to survive the harshest environments. Our comprehensive safety suites are fully certified by international bodies including Nemko, CSA, CE, CC, SABS, and TestSafe for Zone 1, Zone 2, Zone 21, and Zone 22 applications.
Empowering decarbonization paths with IE3, IE4, and IE5 ultra-high efficiency motors. Utilizing permanent magnet and variable speed drive technology to minimize heat output and decrease total energy consumption by up to 25%.
Our catalog covers low, medium, and high voltage three-phase synchronous and asynchronous AC motors. Custom structures are available for tunnel boring, petrochemical processing, maritime vessels, and underground coal extraction.
The global integration of legendary industrial brands under the Wolong Group umbrella.
Acquired by Wolong in 2011 (97.94%). Incorporates Morley (mining motors with 130+ years history) and Laurence Scott (low starting current technology for British nuclear plants & navy generators).
Joined Wolong with over a century of expertise in electric motor design. Renowned for energy-efficient products like the premium W series, built to withstand chemical and dust hazards.
Established in 1882, Schorch joined Wolong in 2011. Providing high-standard customized heavy-duty driving systems for oil and gas, shipbuilding, and power generation.
Global market leader in concrete consolidation and vibration technology. Wolong began joint operations with OLI vibration motors in China in 1999.
China's largest explosion-proof motor R&D and manufacturing base. Jointly integrated into Wolong in 2015 to serve key petrochemical, nuclear power, and defense fields.
Acquired GE Industrial Motors division in 2018, leveraging General Electric's century-long experience in medium and high-voltage commercial motor manufacturing.
Designed for extreme safety: structural and thermodynamic engineering of our explosion-proof motors.
Our rotors feature optimized squirrel cage architecture. Cast aluminum rotors are produced via advanced centrifugal casting or precision high-pressure die-casting. This process pours molten, pure aluminum directly into the slots of the laminated steel rotor core, ensuring zero-porosity, one-piece construction with integrated cooling blades.
For large-capacity and high-voltage motors, copper bar rotors are applied. These feature robust bars secured via high-frequency silver alloy brazing on the end rings. High-speed rotors are equipped with alloy protective retaining rings to prevent centripetal distortion, offering stable performance at variable speeds.
The stator coil windings are wrapped using high-purity mica tape (medium-powdered or low-powder mica with polyester film backing) reinforced with fiberglass cloth. Once wound, the stator undergoes the VPI (Vacuum Pressure Impregnation) process, curing under temperature to form a solid, void-free, moisture-proof winding system.
This complex impregnation cycle guarantees high dielectric strength, exceptional mechanical protection against electromagnetic vibratory stress, high thermal conductivity, and outstanding chemical resistance to corrosive gases common in refinery plants.
Constructed utilizing finite element analysis (FEA) and fluid dynamics simulation platforms, our frames provide excellent structural rigidity and heat dissipation. The frame structure is cast from high-tensile gray iron or welded steel, ensuring safety margins capable of containing internal gas explosions without risk of rupture.
Generous cooling fin geometry facilitates heat transfer in natural convection and forced cooling schemes. Frame sizes from 80 up to 1000+ mm provide isolation from external mechanical shocks, maintaining vibration levels well within Class A criteria (ISO 10816).
Explosion-proof cooling fan systems feature anti-static non-sparking plastic or non-sparking alloy fan blades. The system includes an aerodynamic fan cover body, integrated silencer plates, and sound-absorbing composite liners designed to reduce high-frequency acoustic noise while maintaining optimum pressure drop.
The side-inlet layout diverts blockages behind the motor and achieves IP22 to IP55 protection ratings. It keeps high-velocity airflow directed over the motor surface, guaranteeing a lower overall temperature rise and keeping operations quiet and compliant with environmental standards.
Overcoming regulatory and technical barriers in global hazardous materials distribution.
Our commitment to explosion safety is verified through comprehensive testing. Wolong ensures complete regulatory support for international project developers. From standard industrial setups to critical offshore gas platforms, our engineering files are fully approved and audited by leading certification bodies worldwide.
Nemko / ATEX
CSA
CE
CCC
SABS
TESTSAFE
Under the hood of advanced industrial motor fabrication and global application sectors.
Our custom explosion-proof motors are deployed in ventilation, refrigeration, tunnel excavation, maritime shipping, offshore drilling rigs, chemical processing, coal extraction, and critical power generation. Our engineering teams configure frames, winding profiles, cooling methods, and excitation technologies to match your technical requirements.
Defining next-generation hazardous area drive technologies.
Integration of Ex-rated vibration and temperature sensors into the motor frame. This enables cloud-based predictive maintenance, identifying insulation wear, bearing failures, and lubrication degradation before unplanned downtime occurs.
Replacing standard induction rotors with high-coercivity permanent magnet structures. This provides high torque density and efficiency class IE5 performance at lower operational temperatures, reducing the risk of auto-ignition.
Optimizing motors for Variable Frequency Drive (VFD) operations under ATEX certification. Specialized insulation systems and shaft grounding rings prevent micro-discharge issues, extending bearing and winding life.
Get detailed technical answers regarding explosion-proof motor selection and standards.
Ex d (Flameproof): The enclosure can withstand an internal explosion without igniting explosive gases in the surrounding atmosphere. Ex e (Increased Safety): Design features prevent sparks, arcs, or hot surfaces under normal or overload conditions. Ex p (Pressurized): A continuous positive pressure of inert gas prevents explosive atmospheres from entering the enclosure.
VFDs introduce high peak voltages and fast rise times, which can cause overheating and bearing currents. An explosion-proof motor must be certified for VFD operation. This ensures temperature class compliance across the speed range and includes isolated bearings or grounding brushes to prevent electrical discharges.
Europe requires compliance with the ATEX directive. Motors must have a valid EU-Type Examination Certificate issued by a Notified Body, and the manufacturer's facility must have a Quality Assurance Notification (QAN) audit report. Global IECEx certificates are also widely accepted as baseline technical files.
Dust hazard protection (Ex t) relies on an IP-rated enclosure (typically IP65 or IP66) to prevent combustible dust from contacting hot internal components, coupled with strict limitation of the maximum external surface temperature.
VPI (Vacuum Pressure Impregnation) removes air pockets and moisture from stator windings, replacing them with a cured resin. This eliminates partial discharges, improves heat transfer, and protects windings from vibrations, moisture, and chemical exposure.
Yes. Wolong manufactures a full line of NEMA-standard AC induction motors (NSHE series). These meet NEMA dimensions and electrical requirements, are tested to IEEE standards, and carry UL and CSA safety certifications.
Engineered to drive heavy industrial pumps, compressors, fans, and mixers safely in hazard-prone configurations.
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