Explore our primary collection of high-performance explosion-proof, multi-voltage, and custom-wound induction motors certified for dangerous and heavy-duty locations.
Modern industrial operations face unprecedented pressures to shrink equipment footprints while scaling operational output. Historically, conventional air-cooled motors relied heavily on convective air current flows. However, as high-power mining applications, deep-well water pumps, tunnel boring operations, and petrochemical refineries require high-density designs, traditional fan-based convection falls short.
Liquid-cooled electric motors bypass these limitations by routing coolants directly around high-heat areas like stator slots and stator end windings. This direct thermodynamic design provides exceptional heat absorption, enabling motors to operate continuously at high torque output without risk of insulation breakdown. Procurement directors in regions like North America, Europe, Australia, and East Asia prioritize these solutions to ensure uninterrupted uptime in hazardous situations.
This shift towards closed-loop liquid jacket configurations (using water-glycol or oil) has become a benchmark for smart plants. By replacing external ventilation covers with internal cooling loops, plants reduce dust ingress and lower ambient mechanical noise. This design is highly beneficial for underground coal excavation systems and offshore oil platforms.
Shaanxi Nanfang Motor Technology Co., Ltd serves as the authorized global distributor of Wolong. Established in 1984, Wolong Electric Drive Group Co., Ltd. was listed on the Shanghai Stock Exchange in 2002 (SH600580). Over three decades of growth, Wolong has expanded to include 3 manufacturing bases, 39 factories, and 3 global R&D centers.
By integrating century-old global motor brands—including Brook Crompton, Morley, Laurence Scott, Schorch, ATB, and OLI—Wolong provides customized industrial electric motor solutions worldwide.
This combined expertise allows us to deliver motors certified to domestic and international standards (ATEX, IECEx, CSA, UL) for critical applications in petrochemicals, mining, power generation, and water management.
How Wolong integrated premier global motor manufacturers to build a comprehensive portfolio of explosion-proof and heavy-industry electric drives.
In 2011, Wolong acquired a 97.94% stake in the Austrian ATB Group. This acquisition integrated the Morley brand, which brings nearly 130 years of history in underground coal mining. Morley motors are built to withstand heavy impacts and wet environments in hazardous underground mining areas.
Laurence Scott, a long-term supplier of low starting-current motors for the British nuclear sector and naval vessels, joined Wolong alongside Germany’s Schorch (established 1882). Schorch specializes in heavy-duty drive systems for oil, gas, and municipal water plants worldwide.
Brook Crompton brings over 110 years of experience in high-efficiency low- and medium-voltage motors, including the "W" and "10" series. In 2018, General Electric (GE) partnered with Wolong to support its commercial and industrial motor division across heavy mining, metal processing, and papermaking.
A look at our components, built using multi-physics simulations and premium raw materials to withstand severe industrial wear.
Our coils are insulated with polyester film, reinforced glass cloth, and high-content low- or medium-powder mica tape. Using the Vacuum Pressure Impregnation (VPI) process, the finished stator assembly provides reliable moisture resistance, mechanical strength, and thermal stability in hot or humid environments.
Our rotors feature a squirrel cage configuration. Cast aluminum rotors are produced using centrifugal or die-casting techniques for a solid, single-piece build. For larger capacities, we use copper bar rotors with welded end rings and protective high-speed retaining rings.
Our motor frames are designed using multi-physics structural and fluid dynamic simulations. Cast from high-strength iron or fabricated steel, they offer robust structural redundancy, stable heat dissipation paths, and high natural vibration isolation margins to handle mechanical impacts.
This system features a lightweight fan cover, an air guide cylinder, a protective window, and a silencer plate. The side-entry air intake avoids obstacles behind the motor, optimizing airflow and reducing noise. Rated to IP22, the design prevents accidental physical contact with the fan.
How liquid-cooled electric drives are adapting to meet upcoming requirements for energy efficiency, smart monitoring, and sustainable operations.
International regulations are driving a shift toward higher efficiency classes. Traditional IE3 and IE4 induction systems are being replaced by high-power density permanent magnet configurations (such as the WEPM series). Integrating permanent magnets directly into the rotor design reduces excitation losses, helping systems meet IE5 efficiency metrics and lower lifetime operating costs.
Our engineering team uses real-time CFD (Computational Fluid Dynamics) to build virtual models of internal liquid cooling paths. These simulations map local heat spots across stator winding ends, allowing us to customize glycol channel diameters to balance pressure drop and heat extraction. This process prevents localized thermal aging and extends winding life.
Our modern liquid-cooled motors feature integrated diagnostic arrays. These sensors monitor inlet and outlet coolant temperatures, vibration signatures, and insulation leakage current. By connecting these sensors to central SCADA systems via Modbus or Profinet, operators receive predictive alerts before mechanical failures occur.
To support international trade and installation in hazardous areas, Wolong maintains certification compliance across multiple global regulatory systems.
Our advanced production facilities utilize automated winding, continuous VPI processes, and dynamometer load testing to guarantee motor reliability.
Answers to common engineering and procurement questions regarding liquid-jacket cooling systems and hazardous area compliance.
Liquid-cooled motors provide higher thermal dissipation efficiency because liquids have a higher heat capacity than air. This design allows for a smaller physical footprint while maintaining equivalent power output. It also lowers ambient noise levels and prevents external dust from entering the motor, making it suitable for hazardous, high-temperature, or confined spaces.
Our motors support standard industrial cooling fluids, including water-glycol mixtures and specialized dielectric oils. The internal channels are treated to prevent corrosion and chemical reactions, ensuring compatibility with standard plant cooling networks.
We use flameproof enclosures, positive pressure shells, and non-sparking configurations designed for explosive environments. Our motors carry certifications from international safety bodies, including ATEX (Europe), IECEx (Global), CSA/UL (North America), and TESTSAFE (Australia), ensuring compliance with local safety standards.
Unlike induction systems, PMSMs use integrated permanent magnets in the rotor, which reduces excitation losses. This improves torque density and efficiency, enabling the motors to meet IE5 premium efficiency standards and reduce energy consumption under varying loads.
Explore the remaining collection of our heavy-duty tunnel boring, flameproof, positive-pressure, and high-temperature fire pumps.
Connect with Shaanxi Nanfang Motor Technology for custom shaft dimensions, thermal protections, and localized support.
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