Engineered for hazardous underground operations and explosive atmospheres. Fully certified to global standards.
Critical engineering considerations, regulatory demands, and total cost of ownership (TCO) optimization in heavy-duty mineral extraction.
In modern industrial mining operations—whether extraction occurs in deep underground coal seams or vast, arid open-pit mines—electric motors represent the mechanical muscle behind productivity. The procurement of mining-duty motors is no longer a simple transactional task; it is a multi-dimensional engineering calculation focused heavily on risk mitigation, system efficiency, and environmental compliance.
Global procurement teams at top-tier mining houses, engineering procurement construction (EPC) companies, and original equipment manufacturers (OEMs) face intense pressure to deliver maximum uptime under extreme operational stressors. Motors installed on heavy equipment like conveyor belts, crushers, slurry pumps, and tunnel boring machines (TBMs) are subjected to continuous shock loads, abrasive dust, corrosive chemical environments, and high ambient moisture.
Consequently, the buying journey prioritizes manufacturers who can provide comprehensive third-party safety credentials (such as ATEX, IECEx, CSA, and TestSafe) alongside verifiable efficiency ratings (IE3, IE4, and the emerging IE5 standards). Additionally, smart procurement demands reliable global supply chain networks and post-sale technical support, ensuring that when an unexpected shaft issue arises, replacement components or engineering expertise are deployed immediately to prevent catastrophic financial losses associated with mining downtime.
Integrating global heritage with advanced Chinese manufacturing capability to supply the world's most reliable industrial electric drives.
Shaanxi Nanfang Motor Technology Co., Ltd. is the authorized global distributor of Wolong Electric Drive Group Co., Ltd. Founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (Stock Code: SH600580), Wolong has grown to become a premier global superpower in motor manufacturing and drive systems. Through a strategic sequence of acquisitions over more than three decades, Wolong has established 3 core manufacturing bases, 39 advanced factories, and multiple global R&D centers, positioning itself as a technology leader across China, Europe, the Americas, and the Asia-Pacific region.
Wolong's strength lies not only in its massive production capacity but also in its ownership of some of the most respected, century-old brands in electric machinery history. Under the unified Wolong banner, global industrial brands work synergistically to design next-generation products for heavy industries:
Acquired in 2011, Austria's ATB Group includes Morley, a brand with over 130 years of history in underground coal mining drives. Synonymous with rugged reliability and explosion-proof integrity worldwide.
Founded in 1882, Schorch sets quality standards in oil, gas, and power systems. Laurence Scott specializes in low-starting-current motors, having pioneered designs for naval vessels and nuclear plants.
China's premier research and production base for hazardous area electric motors. CNE joined Wolong in 2015, establishing market dominance in heavy-duty gas and dust explosion-proof applications.
The acquisition of Brook Crompton Motors further expanded Wolong's presence. Brook Crompton is recognized globally for its technological innovation in low, medium, and high-voltage AC electric machinery, developing highly efficient motor platforms (including the signature "W" and "10" series) optimized for harsh industrial process environments.
In addition, partnerships with OLI in 1999 secured market leadership in heavy-duty vibration motors (MVE series) and vibration analysis technology. Wolong's capabilities were further strengthened in 2018 with the acquisition of General Electric's (GE) commercial and industrial motor division, integrating decades of heavy-duty industrial expertise in North American markets, particularly in petroleum, paper, and metallurgy.
Reviewing our path of expansion, technology integration, and certification alignment over the last three decades.
2011: ATB Group Acquisition
Wolong acquired 97.94% of Austria's ATB Group, integrating Morley's mining motors and Laurence Scott's specialized technology into its portfolio.
Brook Crompton Motors
Expansion of the low and medium voltage AC motor lines, strengthening the global distribution network across the Americas, Europe, and Asia.
Heavy-Duty Manufacturing
Integration of Morley’s advanced underground mining motor fabrication and design capabilities at Wolong's global production sites.
Schorch Heavy Electric Motors
German engineering excellence in variable speed drive packages and high-voltage motor fabrication, serving major oil and gas projects globally.
Vibration Motor Integration
Collaboration with OLI to supply robust vibrator systems and monitoring technology for material handling applications.
CNE Strategic Integration
Consolidating China's largest explosion-proof electric drive production infrastructure to optimize lead times and scale manufacturing capabilities.
GE Industrial Drive Alliance
Integration of GE's high-spec industrial motor design standards and North American distribution networks to expand global market access.
State-of-the-Art Core Testing
High-voltage full-load test beds and climate chambers verifying motor characteristics across various operations and environmental conditions.
Multi-National Manufacturing Bases
Collaborating across sites in China, Europe, and Vietnam to balance production loads and optimize logistics for global delivery.
Tailored motor architectures and control systems designed to address the specific performance challenges of key mining machinery.
Designed for environments with explosive gas and coal dust. Features heavy positive pressure housings (YZYKS/YZYKK series) and flameproof enclosures (YBS/YBSS series) to prevent internal ignition from escaping.
Complies with IE3, IE4, and IE5 specifications. Permanent magnet models (WEPM series) optimize operating costs in heavy industrial environments by reducing electrical energy losses during continuous operation.
Custom engineering for specific equipment interfaces, including underground coal shearers (YBC series), tunnel boring machines (YBU/YBUS/YBUD series), and long-distance conveyors.
Nemko / ATEX
CSA
CE
CCC
SABS
TESTSAFE
To support global deployments, our industrial motors are certified to international standards. The acquisition of **TestSafe** certification enables our coal mining motors to comply with Australian regulatory frameworks, simplifying integration for equipment destined for the Southern Hemisphere. Similarly, UL and CSA approvals ensure compliance with North American NEMA standards, while ATEX and IECEx compliance facilitates deployment across the EU and in regions requiring certified explosion-proof equipment.
Understanding the material selection, design elements, and quality control processes that define our heavy-duty motors.
The rotor is a key component in converting electrical energy to mechanical torque under continuous load. The design utilizes a squirrel cage construction, featuring cast aluminum rotors produced using centrifugal casting or high-pressure die-casting. This process results in a single-piece component integrating rotor bars and end rings, which provides mechanical strength and stable torque characteristics.
For larger capacities, copper bar rotors are used. These components rely on specialized bar securing and end ring welding processes to handle dynamic thermal expansion and high starting currents. In high-speed designs, a protective retention ring helps maintain copper bar alignment and structural integrity under high centrifugal forces.
The stator coil is insulated using a combination of polyester film and glass-fiber cloth, along with high-content mica tapes. This insulation is applied to withstand mechanical vibrations, high moisture, and thermal stress in mining operations.
Following winding installation, the stator assembly undergoes Vacuum Pressure Impregnation (VPI). The VPI process removes air voids and moisture from the insulation layer, sealing it with a high-strength protective resin. This ensures dielectric strength, moisture resistance, heat dissipation, and long-term winding life under Class F or Class H thermal conditions.
Our heavy-duty motor frames are developed using digital design platforms that simulate structural mechanics and thermal fluid dynamics. These simulations optimize casting geometry to handle structural stress and vibration in mineral processing environments.
Manufactured from high-strength cast iron or structural steel plates, the frames feature robust structural margins. External cooling fins are designed for heat dissipation, while vibration-damping mounting pads reduce natural frequency resonance. This design helps minimize structural fatigue and extends bearing life under continuous loads.
Operating sound levels are managed via our low-noise fan cover system, which integrates a contoured fan cover body, an air guide cylinder, a protective window, and a sound-damping silencer plate. This layout guides air flow across the motor frame, minimizing cooling losses and reducing noise generated by air turbulence.
By positioning the air inlet on the side, the design prevents blockages caused by nearby structures, keeping airflow consistent. The cover features an IP22 rating, preventing foreign object ingress and contact with the fan blades. The integration of sound-absorbing materials helps reduce high-frequency noise without limiting cooling performance.
Precision Machining: Advanced CNC machining centers maintain precise shaft-to-bearing concentricity and control tolerances on flameproof joints.
Dynamic Balancing: Rotors are balanced on high-precision equipment to minimize vibration, reducing wear on bearings and seals.
Insulation Integrity: Automated testing verifies surge resistance, insulation resistance, and power factor values prior to VPI resin impregnation.
Full-Load Performance: Standard factory acceptance tests verify efficiency, temperature rise, and vibration under rated loads.
Adapting to the transition toward decarbonization, predictive maintenance, and intelligent electrification in the global mining sector.
The global mining industry is working to reduce carbon emissions, prompting operators to replace fossil-fuel power systems with electric drives. Our technical roadmap focuses on expanding high-efficiency motor options, including the **WEPM series** (Permanent Magnet Synchronous Motors). These motors maintain high efficiency across variable load ranges, helping operators lower power usage in ventilation and material handling applications.
Unexpected motor failure in underground applications can lead to costly operational disruptions. To address this, we are integrating digital monitoring technologies into our high-voltage drives. Built-in vibration and temperature sensors communicate with control systems to identify winding deterioration, bearing wear, and cooling blockages before they cause downtime, enabling predictive maintenance schedules.
Operating pumps and fans at fixed speeds can result in unnecessary energy usage. Our variable-frequency explosion-proof motors (**YBBP series**) are designed to withstand the electrical stress associated with VFD control, such as high voltage rise times (dV/dt) and shaft currents. Using insulated bearings and integrated VFD filters, these systems enable precise speed control and reduce overall energy consumption.
Ensuring timely delivery, local regulatory compliance, and post-installation support through our international network.
Leveraging Wolong’s 39 global factories and logistics hubs, we coordinate production and shipping schedules to minimize transport lead times to key mining regions in Australia, South Africa, and the Americas.
We configure motor assemblies to comply with local certifications, including MSHA in the USA, TestSafe in Australia, ATEX in Europe, and national safety marks in local markets.
We provide technical support, start-up commissioning, and spare parts distribution through our global network, helping operators maintain equipment reliability and minimize down-time.
Answers to common engineering and commercial questions regarding our heavy-duty mining and explosion-proof motors.
From water-cooled variable frequency drives to dust-proof high-voltage machines, find the precise motor for your application.
NANFANG
