Browse our premier segment of low-voltage and high-voltage three-phase asynchronous motors designed for extreme duty cycles, flameproof mine installations, and high-efficiency standard drives.
Shaanxi Nanfang Motor Technology Co., Ltd serves as the premier authorized global distributor of Wolong Electric Drive Group Co., Ltd. Established with a vision to deliver robust industrial motor and control configurations, we optimize supply chains to connect global enterprises with manufacturing and R&D bases that have been pioneering motor technology since 1984.
Wolong, listed on the Shanghai Stock Exchange in 2002 (code SH600580), has cultivated a sprawling industrial network comprised of 3 core manufacturing bases, 39 individual specialized factories, and 3 state-of-the-art technological research and development centers globally. By combining deep-seated localization support with the unparalleled engineering capacity of China’s largest motor manufacturing conglomerate, we supply systems featuring international-grade high-voltage, low-voltage, and explosion-proof certifications for critical sectors like oil & gas, infrastructure, mining, and heavy power generation.
A multi-brand portfolio including decades-old names like ATB (Austria), Brook Crompton (UK), Schorch (Germany), Morley, Laurence Scott, OLI, and GE Industrial Motors. Wolong integrates Western engineering principles with Chinese advanced mass manufacturing.
Certified with ATEX, IECEx, CSA, Nemko, UL, SABS, and TESTSAFE. Our designs comply with NEMA Premium, IEC IE3, IE4, and IE5 efficiency standards to meet international carbon reduction and performance goals.
Our technical route prioritizes mechanical redundancy, high-purity conductor materials, and advanced thermal simulation to deliver motors that exceed performance parameters in volatile, dust-heavy, and high-vibration applications.
The squirrel cage rotor utilizes a highly refined, low-resistance cast aluminum design, manufactured via centrifugal aluminum casting or high-pressure die-casting. Molten pure aluminum is injected into the skewed slots of the laminated rotor core, creating a single-piece conductor layout complete with integrated end rings and cooling fins. This eliminates joint-resistance degradation and structural failure points.
For larger high-voltage applications, heavy-duty copper bar rotors are deployed. These bars are permanently anchored in place using advanced brazing and high-frequency induction welding techniques. High-speed models are further outfitted with non-magnetic alloy protective retaining rings to resist intense centrifugal force at over-speed conditions, ensuring consistent air-gap performance and minimizing slip-loss.
The stator coil is wound with premium polyester-imide enameled copper wire, layered with high-mica-content tape, reinforced with glass cloth, and insulated with polyester film. Once configured into the core slots, the stator assembly undergoes the industry-leading Vacuum Pressure Impregnation (VPI) process with Class H solvent-free resin.
This VPI procedure completely replaces micro-voids, moisture, and air pockets with high-density solid dielectric insulation. The resulting winding assembly delivers exceptional mechanical stiffness to withstand electromagnetic shock loads during starting, excellent thermal conductivity, resistance to chemical attack, and Class F (or Class H) insulation performance.
Our heavy-duty motor frames are developed on a digital multi-physics simulation platform incorporating finite element analysis (FEA) for structural dynamics and computational fluid dynamics (CFD) for cooling optimization. Constructed from high-tensile cast iron or welded structural steel, our frames feature thick heat-dissipation fins to maximize surface area contact with cooling air.
This rigid construction is designed with substantial mechanical safety margins to absorb extreme torque stresses and prevent structural resonance. By isolating natural frequencies from common operational speeds, the frame reduces vibration velocity to Grade A levels (per IEC 60034-14), protecting internal bearings and significantly extending the motor’s operational life.
Our ventilation system comprises a lightweight fan, a robust air guide shroud, protective inlet grilles, and noise-damping silencer plates. It is designed to overcome space limitations when positioned near walls or secondary structural equipment. The lateral air inlet design minimizes acoustic energy transfer along the direct line of sight, reducing aerodynamic noise caused by turbulence.
The fan is dynamically balanced and paired with noise-absorbing acoustic linings. This combination keeps ambient operating noise levels well below OSHA and European health standards while maintaining optimal cooling airflow across the frame. The fan hood complies with IP22 (or optionally IP44/IP55) standards to prevent foreign objects or personnel from making contact with rotating components.
Wolong electric motors are tested and certified by leading international testing bodies, facilitating seamless integration into projects with strict safety and energy regulations.
Wolong is an ISO 9001:2015-certified motor manufacturer. Our quality control system manages everything from raw material verification to advanced winding tolerances and final load testing, ensuring reliable motor operation under harsh conditions.
Our explosion-proof product lines meet European ATEX and global IECEx standards for Zone 1 and Zone 2 hazardous areas. They are also certified by CSA and UL for Class I Division 1 & 2 locations across North America.
With SABS approval for South Africa and TESTSAFE certification for Australia, Wolong flameproof and mine-duty motors meet strict safety requirements for deep underground coal mining operations.
Wolong has developed a global presence by acquiring and integrating established motor manufacturers worldwide. This strategy combines advanced Western design experience with China’s manufacturing capacity.
In 2011, Wolong acquired the Austrian ATB Group, which includes Laurence Scott (known for low starting-current machines and naval generators) and Morley (a supplier of mining-duty explosion-proof motors with a 130-year history). This acquisition brought European motor design standards and specialized heavy-industry technology into the Wolong portfolio.
This was followed in 2011 by the integration of Schorch (Germany), a brand dating back to 1882 that specializes in large high-voltage machinery for chemical, petrochemical, and power applications. The integration of Brook Crompton Motors brought a range of standard high-efficiency low-voltage and medium-voltage industrial drives to the group.
In 2015, Nanyang Explosion-Proof Group Co., Ltd (CNE), China’s research and manufacturing base for explosion-proof motors, officially joined Wolong. In 2018, Wolong acquired the commercial and industrial motor division of General Electric (GE), further expanding its product range and engineering capabilities for heavy process industries.
Our factories utilize automated winding systems, large VPI chambers, and full load-testing bays to ensure that every motor meets high performance standards before leaving the facility.
Three-phase asynchronous squirrel cage induction motors are widely used in heavy industrial processes due to their simple design, reliability, and low maintenance requirements. Key application areas include:
Underground coal shearers, conveyors, and cutting heads operate under high vibration and high dust levels. Our flameproof series (like YBK3 and YBC) are engineered to prevent flame transmission while delivering the high torque required for continuous operation.
Petrochemical plants use chemical pumps, compressors, and high-pressure blowers in environments with explosive gases. Our ATEX/IECEx certified explosion-proof motors (such as YB3 and WEBP3) feature flameproof enclosures designed to contain internal gas explosions without igniting the surrounding atmosphere.
High-capacity water supply projects and wastewater treatment facilities require high-voltage motors (like YKK and YR/YRKK series) to drive large centrifugal pumps and aerators continuously, prioritizing high energy efficiency and low failure rates.
The industrial motor sector is evolving toward higher efficiency, integrated condition monitoring, and compatibility with variable frequency drives (VFDs). Our development roadmap focuses on several key areas:
Building on our YE4 and WEBP3 series, we are developing IE5 permanent magnet synchronous motors (PMSM) and synchronous reluctance motors (SynRM). These designs reduce rotor losses, allowing for higher efficiency levels and smaller frame sizes.
By integrating temperature, vibration, and magnetic flux sensors directly into the motor frame, we enable real-time condition monitoring. Automated alerts detect bearing wear or winding imbalances before they cause unexpected downtime.
Wolong’s production model combines raw material integration with advanced manufacturing processes to maintain consistent supply timelines:
| Supply Chain Component | Wolong Strategy | Customer Benefit |
|---|---|---|
| Raw Material Sourcing | Long-term partnerships for electrical steel sheet laminations and high-purity copper windings. | Stable material pricing and consistent motor performance. |
| Manufacturing Redundancy | 39 factories worldwide with standardized casting, machining, and winding equipment. | Production load balancing to protect delivery schedules from local disruptions. |
| Integrated Testing | On-site high-voltage and load-testing laboratories certified by TÜV, CSA, and CNAS. | Accelerated certification and compliance verification. |
Review answers to common technical questions regarding specification, starting methods, protection ratings, and maintenance protocols.
Examine our selection of high-voltage asynchronous motors, NEMA-compliant explosion-proof units, and variable speed motors for demanding process environments.
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