Engineered for hazardous locations, delivering peak efficiency, custom mechanical configuration, and certified safety compliance.
Industrial operations in hazardous environments demand the highest levels of electrical safety, mechanical endurance, and operational efficiency. The term "Box Design" represents an advanced modular housing concept for high-voltage (HV) motors. Unlike traditional cylindrical ribbed frames, box-style enclosures facilitate optimized cooling configurations, structural stiffness, and custom acoustic attenuation, making them the standard choice for major chemical plants, oil refineries, and mine ventilation sites globally.
Modern procurement strategies require deep technical integration between explosion-proof (Ex) motor manufacturers and engineering procurement companies (EPCs). Key priorities include:
Large-scale energy and infrastructure projects evaluate electric drive systems using precise operational data. The following factors define modern supply chain criteria:
High structural margins minimize resonance and prevent localized mechanical fatigue.
Modular box systems support top-mounted air-to-air (IC611) or air-to-water (IC81W) heat exchangers.
Vacuum Pressure Impregnation (VPI) with high-content mica tapes guarantees long life cycle performance.
Engineered variable speed drives (VSD) match loads precisely, eliminating system surges.
Shaanxi Nanfang Motor Technology Co., Ltd & Wolong Electric Drive Group Co., Ltd.
Shaanxi Nanfang Motor Technology Co., Ltd serves as the premier authorized global distributor of Wolong. Founded in 1984, Wolong Electric Drive Group Co., Ltd. was listed on the Shanghai Stock Exchange in 2002 (code SH600580). Over the past three decades, Wolong has expanded to 3 core manufacturing bases, 39 advanced factories, and 3 global R&D centers, positioning itself at the absolute forefront of the global electric motor and drive control industry.
Our collaborative mission is focused on delivering a global brand strategy that blends Chinese engineering agility, European design excellence, and American industrial reliability. By leveraging high-precision manufacturing, we ensure that every box design Ex motor provides optimized safety margins and low operational downtime in hazardous petrochemical, coal mining, and process industries.
Unifying legendary engineering heritage under a single, unified electric drive platform.
Acquired in 2011, Austria's ATB Group brought robust European design technology. Its subsidiary, Morley, carries nearly 130 years of underground coal mining expertise. Meanwhile, Laurence Scott has supplied specialized low starting current motors for British nuclear facilities and heavy-duty naval vessel generators for generations, winning the Queen's Award multiple times.
Brook Crompton represents over a century of low, medium, and high-voltage design, pioneering energy-efficient standard motors and Ex-proof machinery like the "W" and "10" series. Schorch, established in Germany in 1882, is a premier supplier for complex driving systems in oil and gas, shipbuilding, tunnel drives, and advanced test benches.
In 2015, China's largest explosion-proof base, Nanyang Explosion-Proof Group (CNE), joined Wolong. Partnering with OLI in 1999 secured market leadership in vibration motors. In 2018, acquiring General Electric's (GE) industrial motor business expanded technological strength in American heavy industries.
A deep engineering look inside the structural components that drive high-voltage safety and resilience.
Our rotors leverage a rugged squirrel-cage design configured through cast aluminum or copper bar welding. Centrifugal aluminum casting and high-pressure die-casting ensure void-free filling of the rotor core slots. This single-piece construction, integrating rotor bars and end rings, yields excellent thermal and mechanical load capacities.
For high-capacity or variable-frequency drives, copper bar rotors with precision welded end-rings are used. The addition of retaining or protective rings prevents structural deformation during high-speed operation.
The insulation system utilizes low-powder or medium-powder mica tape backed with high-tensile glass cloth and polyester film. Following structural winding, the entire stator core undergoes the Vacuum Pressure Impregnation (VPI) process, resulting in a dense, void-free insulation barrier.
This process gives the windings outstanding electrical strength, moisture resistance, and thermal stability (insulation class F or H), making them capable of handling the high-frequency voltage spikes generated by variable speed drives.
Utilizing structural and fluid multi-physics digital simulations, the motor frame is engineered using high-strength cast iron or welded steel plates. The box design is highly redundant, providing exceptional mechanical stiffness and resistance to external shocks.
By optimizing internal heat flow paths and isolating structural resonance frequencies, the frame design ensures low noise and minimal vibration during operation.
The cooling fan system includes an optimized shroud, internal air guide cylinder, protective window, and acoustic silencer plate. Placing the air intake on the side helps avoid obstructions behind the motor, reducing energy losses and lowering noise emissions.
Equipped with sound-absorbing materials, the fan cover has an IP22 rating, preventing accidental contact with rotating components while maintaining optimal airflow.
Enabling safe, compliant operations in restricted and hazardous industrial zones worldwide.
To support global distribution, Wolong has obtained key certifications required to clear trade barriers and meet local safety laws:
A look at our factory floors, precise testing processes, and global certification records.
Engineered to deliver high safety margins and reliable performance across demanding industrial environments.
Used to power offshore oil platforms, pipelines, and refineries, our Ex d and Ex p motors reliably drive heavy-duty compressors, crude oil transmission pumps, and high-flow air coolers, keeping process loops running safely.
Specifically designed for underground coal mines, these flameproof motors are built to withstand coal dust and methane exposure. They deliver high starting torque for heavy conveyor belts, continuous miners, and main ventilation fans.
These motors feature anti-corrosion finishes and chemical-resistant VPI insulation, providing reliable service in chemical processing plants. They drive critical reactor agitators, centrifuges, and waste-gas exhaust fans.
Additionally, Wolong’s electric motors provide reliable drive systems for infrastructure equipment, including high-capacity water treatment pumps, ventilation systems, cement manufacturing machinery, and power generation turbines, backed by global service and support.
Global standards for energy efficiency and industrial safety are rapidly evolving. The transition to premium IE4 and IE5 standards is no longer just a regulatory requirement; it is a key strategy for lowering long-term operating costs. Wolong's product roadmap focuses on integrating advanced permanent magnet synchronous motors (PMSM) with variable frequency speed regulation systems, allowing facilities to match motor output directly to real-time process demands.
Additionally, we are incorporating smart diagnostics into our Ex motor configurations. Using integrated Ex vibration sensors, thermal probes, and real-time current signature analysis, our motors feed operational data directly to central control systems. This enables predictive maintenance, helping plant managers prevent costly unplanned shutdowns and extend the lifespan of their drive components.
Ensuring operational reliability in challenging environments with engineered industrial electric motor configurations.
Common questions regarding configuration, safety certifications, and custom orders for explosion-proof motor systems.
NANFANG