High-efficiency, low-voltage, and high-voltage AC electric motors engineered for hazardous areas and extreme industrial environments.
Shaanxi Nanfang Motor Technology Co., Ltd serves as the premier authorized global distributor for Wolong Electric Drive Group Co., Ltd. Founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (SH600580), Wolong has pioneered transitions in the electric machine industry. With 3 world-class corporate R&D centers, 39 advanced smart manufacturing facilities, and 3 global manufacturing bases, Wolong is an international powerhouse in motor manufacturing and electronic drive control systems.
By executing an aggressive global brand integration strategy, Wolong has consolidated the intellectual property, design legacies, and manufacturing assets of historic Western European and American electric motor pioneers. Our combined product catalog spans fractional horsepower pumps up to massive multi-megawatt high-voltage positive pressure systems designed for crucial infrastructure projects.
Our engineered solutions ensure continuous operation, safe isolation of electrical arcs, high thermal endurance, and mechanical integrity in explosive dust atmospheres (Class II) and vapor-filled petrochemical installations (Class I, Division 1 & 2 / Zone 1 & 2).
Global Factories
Exporting Countries
Core Innovation Patents
Mega Projects Completed
Engineered to eliminate internal explosive propagation risks while delivering unmatched fluid-handling efficiency.
Designed to comply with rigorous explosion-proof directives including ATEX (Europe), IECEx (Global), CSA (North America), EAC (Eurasian Union), and TestSafe (Australia/Oceania). Provides reliable performance in gas Zone 1, Zone 2, and dust Zone 21/22 environments.
Meets eco-design regulations with asynchronous and permanent magnet synchronous motors (PMSM) up to IE5 efficiency levels. Lowers total cost of ownership (TCO) and limits carbon footprint through reduced energy losses.
Highly customizable frame sizes (from 80 to 1000mm), mounting configurations (B3, B5, B35, V1), terminal box placements, shaft extensions, and specific duty cycles (S1 to S9) optimized for API 610 pumps.
Under the hood of Wolong's explosion-proof technology: premium materials and advanced structural design.
Our squirrel-cage rotors are engineered using high-pressure centrifugal aluminum casting or die-casting to eliminate gas porosity. This design delivers high starting torque, low slip rates, and robust transient overload capacity.
Our stators are built with high-grade, double-insulated copper wire wrapped with composite polyester film and glass-fiber mica tape, designed for low thermal aging and high dielectric strength.
The motor enclosure is designed using Finite Element Analysis (FEA) to ensure it can contain internal explosions without rupturing or igniting surrounding explosive atmospheres.
Designed for low-noise operation, our cooling fans optimize airflow distribution across the frame while minimizing acoustic footprints.
How Wolong has integrated European and American legacy engineering with modern manufacturing efficiency.
Acquired by Wolong in 2011, ATB is one of Europe's premier industrial motor brands. This acquisition integrated Morley (famous for heavy-duty flameproof mining drives) and Laurence Scott (well-known for high-voltage, low-starting-current machines used in naval and nuclear applications).
With over a century of electric machine design history, Brook Crompton joined the Wolong Group, contributing its robust "W" and "10" series designs and high-efficiency motor lines.
Established in 1882 in Germany and acquired by Wolong in 2011, Schorch provides engineered driving systems for oil and gas, power generation, water treatment, and chemical processing.
Partnered with Wolong in China since 1999, OLI is a world leader in electric external vibrators, dynamic rotary systems, and specialized explosion-proof vibration sensors.
Acquired in 2015, CNE is China's largest scientific research and manufacturing base for flameproof and explosion-resistant electric motors, widely used in chemical and national defense projects.
Integrating GE's commercial and industrial motor division in 2018 added key American API, IEEE-841, and Class I Div 1/2 design standards to Wolong's global product line.
Compliance is safety. Our motors are tested and approved by leading global notification bodies.
Nemko / ATEX
CSA Standard
CE Directives
CCC Ex
SABS (South Africa)
TESTSAFE (Australia)
Underwriters Laboratories (UL) & Canadian Standards Association (CSA): Tested for Class I, Div 1 & 2, Groups A, B, C, and D, and Class II, Div 1 & 2, Groups E, F, and G. Complete compliance with NEMA MG1 design standards.
ATEX (Directive 2014/34/EU) & IECEx: Approved for Zone 1 (Ex d, Ex de, Ex p) and Zone 2 (Ex n, Ex ec) gas classifications, as well as Zone 21 and Zone 22 (Ex tb, Ex tc) dust protection classifications.
TestSafe (Australia): The acquisition of TestSafe certification enables the export of Chinese-manufactured heavy-duty mining and explosion-proof motors directly to Australia and Oceania.
Why EPC companies, OEM pump manufacturers, and major distributors choose us.
Manufacturing in our Chinese facilities provides a highly integrated industrial ecosystem. We source high-grade raw materials—such as cold-rolled non-oriented silicon steel sheets and 99.99% pure oxygen-free copper wire—directly from local, high-capacity smelters. By incorporating automated CNC machining, robotic winding, and digital QA testing systems, we deliver European-engineered precision at a competitive cost of ownership.
Our explosion-proof pump motors are built for heavy-duty process applications:
• Petroleum Refining & Offshore Drilling: Pumping crude oil, LPG, and hydrocarbon products.
• Chemical & Pharmaceutical Processes: Handling volatile acids, solvents, and corrosive chemicals.
• Deep Shaft & Open-Cast Coal Mining: Conveying slurry, mine drainage water, and ventilation systems.
• Wastewater & Slurry Lift Stations: Managing explosive methane gas pockets in municipal sewage systems.
In-depth answers to common questions about explosion-proof pump motor technologies.
A Flameproof (Ex d) enclosure is designed to withstand an internal explosion of a flammable gas-air mixture without transmitting the explosion to the surrounding atmosphere. The joints and flameproof paths are engineered to cool escaping combustion gases below their ignition temperatures.
Conversely, an Increased Safety (Ex e) design uses methods to prevent electrical sparks, arcs, or dangerous surface temperatures from occurring under both normal running and specified overload conditions. It does not contain an internal explosion but prevents ignition sources from developing.
When operating a motor via a Variable Frequency Drive (VFD) in a hazardous area, you must prevent excessive thermal rise caused by high harmonics and reduced cooling at low speeds.
Key requirements include:
• Incorporating PTC thermistors or PT100 temperature sensors directly in the stator windings to monitor thermal conditions in real time.
• Utilizing insulation systems designed to handle VFD-induced voltage spikes (e.g., insulated non-drive end bearings to prevent circulating shaft currents).
• Specifying variable frequency flameproof series like the Wolong Nanyang YBBP to ensure thermal safety across the entire speed control range.
Positive Pressure (Ex p) designs prevent explosive gases from entering the motor enclosure by maintaining a continuous internal overpressure of protective gas (air or inert gas) relative to the surrounding atmosphere.
This design allows large high-voltage motors (such as the YZYKK series) to operate safely in Zone 1 or Zone 2 areas where flameproof enclosures are impractical due to size, weight, or thermal limitations.
High-capacity synchronous, asynchronous, wound rotor, and permanent magnet electric motors.
Consult with our application engineers for tailored mounting, certification compliance, and direct-factory procurement pricing.
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