Optimized low RPM, flameproof, explosion-proof, and custom heavy-duty electric motors developed for highly demanding operating conditions.
Shaanxi Nanfang Motor Technology Co., Ltd serves as the premier authorized global distributor of Wolong Electric Drive Group Co., Ltd. Founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (code: SH600580), Wolong has advanced over three decades to establish a formidable global footprint.
Wolong currently maintains 3 manufacturing bases, 39 state-of-the-art factories, and 3 specialized global R&D centers. Committed to a sophisticated global brand strategy, Wolong acts as a market leader in technology research, manufacturing processes, quality design, and localized services.
By offering customized low RPM motors and high-voltage driving systems, we provide comprehensive industrial solutions designed to maximize efficiency, reduce operational overhead, and ensure absolute safety in hazardous operating environments.
Learn More About Wolong
Wolong's strategic acquisitions bring together the world's most trusted legacy motor brands, elevating technological design and market capability.
Acquired in 2011, ATB is one of Europe's top three motor manufacturers. This acquisition integrated renowned heavy-industry brands, including Morley (underground mining specialists) and Laurence Scott (custom low-starting-current solutions).
A global leader in high-efficiency industrial motors for over 100 years. Brook Crompton is famous for pioneering the energy-efficient "W" and "10" series motors, bringing advanced low-voltage and high-voltage dynamic drive expertise to Wolong.
Established in Germany in 1882, Schorch defines high-quality, heavy-duty drive systems for petrochemical and tunneling applications. Combined with OLI, the global leader in industrial vibration motors, our mechanical depth is unmatched.
In 2018, General Electric (GE) Industrial Motors joined Wolong. As a legendary manufacturer of commercial and heavy-duty electrical equipment, GE brings premium expertise to our designs for petrochemical, power generation, and steel applications.
Similarly, the integration of CNE (Nanyang Explosion-Proof Group)—China's largest research and production base for explosion-proof motors—cemented our leadership in safety critical technologies. This combination allows us to manufacture complex drive solutions that perform reliably in extreme environments.
As carbon neutrality targets accelerate globally, heavy industries demand low RPM electric motors that optimize energy consumption, reduce reliance on high-wear gearboxes, and eliminate down-time.
Traditional setups use high-speed motors paired with complex mechanical gearboxes, leading to energy loss, high friction, and regular maintenance requirements. Wolong's customized low RPM motors act as direct-drive units. By eliminating the gearbox, they reduce transmission losses by 5% to 15%, lowering overall operational costs in mining, wastewater management, and heavy manufacturing.
Modern petrochemical, oil & gas, and heavy chemical operations face strict safety regulations. The integration of Nanyang CNE, ATB, and GE allows Wolong to offer a comprehensive range of certified explosion-proof motors. These units are built to withstand corrosive atmospheres and prevent explosive events in hazardous areas, aligning with changing international safety guidelines.
In response to global regulations targeting industrial emissions, Wolong provides permanent magnet synchronous motors (PMSM) and high-efficiency induction motors rated IE4 and IE5. By improving partial-load efficiency, these designs help heavy industries lower energy consumption and meet international sustainability metrics.
A detailed look at the mechanical engineering and material science that ensure the reliability of Wolong's low RPM electric motors.
The rotor features a rugged squirrel-cage design, with cast aluminum options produced using advanced centrifugal casting or high-pressure die-casting. This process pours molten, pure aluminum into the core slots to form a single, integrated piece that combines the rotor bars and end rings, delivering excellent starting torque and structural durability.
For high-capacity or specialized applications, we use high-grade copper bar rotors. These elements are secured with durable bar-locking systems and end-ring welding. For high-speed models, customized protective retaining rings are added to safeguard the assembly against centrifugal stresses and maintain balance under heavy dynamic loads.
The stator windings are insulated using high-performance polyester film reinforced with woven glass cloth. They are wrapped with low-powder mica tape or medium-powdered mica tape, which contains a high percentage of natural mica for superior dielectric strength.
Once wound, the stator undergoes a comprehensive Vacuum Pressure Impregnation (VPI) process. This cycle removes air pockets and cures the assembly, creating a solid, moisture-resistant winding. This structural design provides excellent mechanical strength, high thermal stability, and reliable performance in damp or corrosive environments.
The motor frame is developed using digital multi-physics simulation platforms, optimizing structural load distribution and fluid-dynamic cooling. Using high-strength cast iron or structural steel, these frames are built with substantial mechanical margin.
The rib arrangement is engineered to dissipate heat quickly, keeping internal temperatures within stable limits. By calculating resonance frequencies, the frame design isolates mechanical vibrations, protecting internal bearings and extending the operating life of the entire drive system.
The ventilation system consists of an engineered fan cover, an air-guide cylinder, protective mesh windows, and integrated silencer plates. The side-inlet design helps avoid obstacles behind the motor, optimizing airflow and reducing the noise generated by turbulent air.
Constructed with specialized sound-absorbing materials, the fan cover attenuates high-frequency noise. Rated at IP22, the hood design prevents external contact with the fan blades, ensuring a safe and quiet working environment.
Wolong motors comply with all major international trade and safety regulations, ensuring smooth integration and reliable compliance for global projects.
Nemko/ATEX
CSA
CE
CCC
SABS
TESTSAFE
Engineered to deliver high torque and reliable performance in demanding, safety-critical environments.
Tunneling cutters require massive startup torque under heavy soil loads. Wolong's specialized flameproof motors supply high torque density from start, driving the cutterhead reliably through rock and soil without overheating.
Underground operations demand absolute flameproof protection due to the presence of methane and coal dust. Supported by our Morley brand heritage, Wolong's heavy-duty conveyor and shearer motors operate reliably under continuous high-load conditions.
From pipeline pumps to process compressors, gas processing facilities require motors with certified explosion protection. Our positive-pressure housing motors (YZYKK, TAW, and TZYW series) isolate potential electrical arcs from flammable gases, ensuring safe, continuous operation.
How Wolong is adapting to the next generation of industrial drive technology, electrification, and intelligent controls.
Wolong is integrating intelligent diagnostic sensors directly into our low RPM electric motors. These integrated vibration sensors and temperature probes continuously monitor motor health during operation.
By connecting to plant control systems or cloud diagnostics, this setup enables predictive maintenance. Operators can detect bearing wear or winding issues early, preventing unexpected outages and extending the lifetime of the machine.
Our engineering research focuses on developing permanent magnet motors that meet emerging IE6 efficiency standards. By utilizing high-coercivity permanent magnet materials and optimized stator windings, these motors minimize slip losses.
We are also researching lightweight composite materials for motor fans, housings, and terminal boxes to reduce physical weight while keeping mechanical and heat dissipation capabilities high.
Expert answers to common engineering questions regarding the application, selection, and performance of low RPM electric motors.
Explore our technical range of synchronous condensers, tunnel boring drives, high-temperature units, and certified flameproof industrial motors.
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