Explore our premium range of industrial AC electric motors built for safety in hazardous environments, extreme performance efficiency, and heavy-duty durability.
The Premium Gateway to Wolong Electric's Global Manufacturing Excellence
Shaanxi Nanfang Motor Technology Co., Ltd. is the authorized global distributor of Wolong Electric Drive Group Co., Ltd. Founded in 1984, Wolong Electric successfully listed on the Shanghai Stock Exchange in 2002 (Stock Code: SH600580). Over the past three decades, Wolong has expanded dynamically to operate 3 global manufacturing bases, 39 advanced factories, and 3 research and development centers worldwide.
Through a rigorous international integration program, Wolong has solidified its leadership position in the electric drive industry. Wolong is committed to a unified global brand strategy, maintaining high standard R&D, structural design, testing, manufacturing, and support infrastructure across major target markets in Europe, the Americas, Asia-Pacific, and the Middle East.
A Professional Engineering Guide to Explosion Protection, Industrial Trends, and Supply Chain Architecture
The global process industry is transitioning rapidly toward energy efficiency and smart diagnostic networks. In hazardous environments like petrochemical plants, deep coal mines, and offshore LNG terminals, high-voltage explosion-proof motors (Ex Motors) serve as the primary prime movers for large pumps, heavy compressors, and multi-mile conveyor belts. The current engineering trends include:
Procurement decisions in the Oil & Gas, Mining, and Power sectors are dictated by high safety standards and reliable operational lifetimes. Specifying a High Voltage Ex Motor requires a comprehensive review of target configurations, certification cross-recognition, and field alignment. Purchasing entities focus on VPI (Vacuum Pressure Impregnation) winding integrity, bearings protection systems, and mechanical shaft strength to handle heavy radial or axial loads. Sourcing from experienced Chinese manufacturers like Wolong guarantees international standard alignment at highly competitive lifecycle costs.
China’s industrial strategy has turned manufacturing centers like Wolong’s plants into highly digitalized "Smart Factories". Vertical integration of the supply chain—from rare earth mining for permanent magnets, in-house copper bar casting, advanced stamping lines, to automatic VPI encapsulation units—protects the manufacturing cycle from raw material supply shocks. With 39 factories operating under unified ERP/MES control, production runs are optimized for speed, precision, and repeatability, offering global customers stable lead times and customized engineering designs.
Why global engineers specify our electric drives for hazardous locations
Different kinds of Ex certificates are available for your local regulatory framework and regional safety directives. Reliable and certified protection against explosion hazards.
IE5, IE4, and IE3 high-efficiency motors are ready for global deployment. We also design permanent magnet synchronous motors (PMSM) for deep energy conservation and optimal torque ratios.
A broad technology platform covering low voltage, medium voltage, and high voltage asynchronous and synchronous Ex motors matching extreme load profiles in classified zones.
Wolong operates leading motor and drive control R&D centers in China, Europe, and Japan, with a central research institute in Shanghai. Their engineers continuously develop top-tier tech to keep products at leading global standards.
Wolong group owns top-tier domestic brands like Nanyang Explosion (CNE), alongside internationally renowned century-old brands, including Brook Crompton, Morley, Laurence Scott, Schorch, and ATB.
WOLONG electric drives have significant advantages in explosion safety, reliability, and durability. Widely certified by global agencies including ATEX, IECEx, CU-TR (EAC), CSA, UL, and TESTSAFE.
Premium raw materials, high precision engineering, and strict validation protocols
The rotor features a high-performance squirrel cage design, utilizing cast aluminum rotors produced using centrifugal aluminum casting or high-pressure die-casting techniques. In this process, molten pure aluminum is poured directly into the slots of the rotor core, creating a single-piece construction that integrates the rotor bars and end rings.
The structural integrity and manufacturing process of cast aluminum rotors guarantee the motor rotor's reliability, and also endow the motor with outstanding torque properties. For larger capacity high-voltage motors, copper bar rotors are employed, which benefit from dependable bar securing and advanced end-ring welding procedures. Additionally, the protective ring design of high-speed motors further ensures the reliable operation of the copper bar rotor under heavy dynamic loads.
The coils are crafted from premium polyester film reinforced with high-density glass cloth. High-mica content tape is wound around the conductors, utilizing low-powder or medium-powdered mica options. Following winding, the assembly goes through a modern VPI (Vacuum Pressure Impregnation) process, transforming the bare windings into a fully sealed, high-strength insulation block.
The winding and insulation are meticulously engineered to provide exceptional electrical performance, mechanical strength, resistance to moisture, and long-term thermal stability under harsh duty cycles.
Our motor frames are developed on a digital platform for structural and fluid multi-physics simulation. This structural modeling retains the integrity of the original patents while using high-strength cast iron (or structural steel options).
The frame boasts exceptional structural redundancy, outstanding heat dissipation properties, and ample inherent frequency isolation margins for the entire machine. It is engineered to endure significant mechanical shocks, maintain a superior low-vibration level, and ensure lower temperature increases during continuous operation.
The ventilation structure consists of an optimized fan cover body, an air guide cylinder, a protective window, and a silencer plate. Its compact structure and lightweight design minimize mechanical vibrations.
The air inlet is located on the side, minimizing adverse effects on ventilation and reducing noise caused by energy loss along the flow path. The system also incorporates sound-absorbing materials that lower the overall motor noise. The fan cover is rated IP22, ensuring safety protection.
Building a Global Industrial Empire through Targeted Acquisitions of Century-Old Motor Brands
Over its years of strategic growth, Wolong Electric has built a comprehensive technology and manufacturing network by acquiring some of the world's most respected motor manufacturers.
"Originating in Shangyu and growing in China, WOLONG is now a global pioneer in the innovation and manufacturing of electric drives."
Fully compliant with international safety and performance standards
WOLONG maintains a comprehensive certification profile to support project compliance in global markets:
Serving major infrastructure, energy, and process projects around the world
As a globally integrated manufacturer of motors and drive systems, WOLONG operates 39 production facilities and 4 R&D centers across China, Vietnam, the UK, Germany, Austria, Italy, Serbia, Mexico, and India.
WOLONG's industrial motor lineup supports major applications in energy, manufacturing, and transport infrastructure. These systems are used to drive pumps, fans, compressors, and high-capacity conveyor belts in challenging operating conditions.
Common engineering questions regarding High Voltage Explosion-Proof Motors
Premium heavy duty drive motors for specialized high-power applications
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