Industrial grade, globally certified explosion-proof AC motors engineered for gas, vapor, and coal dust environments.
Shaanxi Nanfang Motor Technology Co., Ltd. is the authorized distributor of Wolong. Wolong Electric Drive Group Co., Ltd. was founded in 1984 and successfully listed in 2002 (code SH600580). Over more than 30 years of strategic development, Wolong has established 3 world-class manufacturing bases, 39 advanced factories, and 3 high-tech R&D centers globally.
By specializing in the design, engineering, and manufacturing of high-performance electric motors and complex drive control systems, Wolong drives global industrial efficiency. Our ongoing commitment to a global brand strategy makes us a frontrunner in R&D, process optimization, precision manufacturing, and localized distribution networks.
Analyzing key advancements driving the next generation of hazardous location powertrain designs.
The global push for carbon neutrality is driving industrial operations to transition from standard IE3 motors to ultra-premium IE4 and IE5 permanent magnet topologies. Even within Class 1 Div 1 requirements, minimizing energy dissipation reduces internal temperatures, directly increasing motor safety margins.
Multi-certified powertrains that simultaneously fulfill NEMA Class 1 Div 1, ATEX Zone 1, and IECEx standards are replacing single-region models. OEMs benefit from consolidated spare parts inventories and reduced localized compliance complexity across global sites.
Integrating explosion-proof smart vibration, current, and temperature sensors onto the motor frame enables real-time diagnostic capabilities. AI-driven monitoring predicts winding insulation failures or bearing wear before catastrophic downtime incidents occur.
Industrial procurement teams targeting Class 1 Div 1 motors must balance safety parameters with long-term operational costs. Key parameters include checking the Gas Group compatibility (Group C & D vs Group A & B), ensuring the critical temperature class (T-Code) matches local environment conditions, and planning for severe ambient temperatures.
As a primary global OEM supplier, Shaanxi Nanfang Motor offers customizable frame dimensions, dynamic shaft sizing, special terminal box layouts, and tailored winding profiles. Our direct engineering consultations ensure your drive components perfectly match standard centrifugal pumps, oil compressors, mud agitators, and heavy ventilation systems.
Engineered drive packages tailored to withstand the harshest environments globally.
In environments with continuous exposure to hydrocarbon gases, our flameproof and positive pressure motors (YZYKK and YZYKS series) provide reliable mechanical power to heavy process pumps and gas compressors. Engineered with corrosion-resistant finishes to withstand sour gas components.
Through the renowned Morley brand, we supply heavy-duty cutting and conveyor motors designed specifically for underground coal mining. These systems feature impact-resistant enclosures and robust structural frames to withstand high mechanical vibrations and combustible coal dust.
Equipped with specialized seawater-resistant seals and anti-condensation heaters, our marine explosion-proof range provides reliable power for offshore drilling platforms, dynamic positioning thrusters, and safety-critical fire water pumps.
Precision manufacturing details and mechanical features of Wolong explosion-proof motors.
Our rotors feature an optimized squirrel cage design. Cast aluminum rotors are produced using centrifugal aluminum casting or die-casting techniques. Molten pure aluminum is poured directly into the slots of the rotor core, creating a single-piece construction that integrates the rotor bars and end rings.
This structural integrity guarantees long-term reliability and provides excellent torque properties. For larger capacity systems, we implement copper bar rotors utilizing high-strength welding procedures on the end rings. High-speed motors incorporate specialized protective retaining rings to prevent centripetal distortion.
The coil system is crafted from high-grade polyester film reinforced with glass cloth, using low-powder mica tape with a high mica content. Following the VPI (Vacuum Pressure Impregnation) process, a pristine white coil structure is produced.
Once the billet is extracted, it undergoes thermal curing cycles to form a unified, solid insulation block. The insulation system is meticulously engineered to provide high electrical insulation margins, mechanical strength, moisture resistance, and thermal stability in tough conditions.
The motor frame is developed using digital simulations of structural and fluid multi-physics fields. This process preserves the core design while utilizing high-strength cast iron (or structural steel) to ensure structural redundancy.
This digital design guarantees high thermal dissipation efficiency and ample natural frequency isolation margins. The structure is built to withstand mechanical shocks, reduce vibration levels, and limit temperature rise during continuous operation in hazardous atmospheres.
The low-noise fan cover system comprises a fan cover body, an air guide cylinder, a protective window, and a silencer plate. Its compact structure and lightweight design facilitate vibration reduction.
The air inlet is situated on the side, optimizing the clearance behind the motor and minimizing noise from air path turbulence. Incorporating advanced sound-absorbing materials, the fan cover is rated IP22, preventing accidental contact with the rotating fan blades.
Integrating historic global motor manufacturers to build a comprehensive hazardous area power portfolio.
WOLONG has expanded its technical capabilities through strategic global acquisitions, integrating historic international motor manufacturers into its network.
In 2011, WOLONG acquired a 97.94% stake in the Austrian ATB Group, which includes Morley and Laurence Scott. Morley brings nearly 130 years of history in underground coal mining drives, while Laurence Scott is recognized for low starting current designs used in power plants and naval applications.
Additionally, Brook Crompton Motors joined the group, bringing over a century of experience in motor design and energy-efficient systems. The acquisition of Schorch in 2011 added high-specification drive systems for chemical, power, and water projects. OLI joined the network in 1999, bringing vibration motor and sensor technology.
In 2015, the addition of CNE (Nanyang Explosion-proof Group) strengthened our explosion-proof motor R&D. In 2018, the integration of General Electric (GE) commercial and industrial motors added further depth to our technical capabilities.
Nearly 130 years of underground coal mining technology and high-specification drive systems.
Specialists in low starting current systems and naval-grade generator applications.
Innovators in premium efficiency low/medium voltage motors for harsh processing environments.
Deep expertise in heavy industrial drivetrains for oil, gas, and mining applications.
WOLONG electric motors carry all necessary certificates to clear trade and safety barriers worldwide.
Our compliance strategy covers the entire motor value chain to support international trade and localized project installations:
ISO 9001 Ex Standard: WOLONG maintains ISO 9001 certification across its manufacturing plants, establishing a standardized framework for explosion-proof quality control.
NEMA Mechanical & Electrical Standards: To verify compliance with NEMA mechanical performance specifications, our low-voltage electric motors undergo standard testing including efficiency, insulation resistance, starting current, torque, vibration, and noise testing. These designs are certified by UL and CSA.
IECEx & ATEX Standards: Our explosion-proof low-voltage and high-voltage motors carry IECEx and ATEX certifications, facilitating direct export and compliance within European Union markets.
TESTSAFE Standard: Through Testsafe, the largest coal product certification body in the Southern Hemisphere, WOLONG mining motors are certified for entry into Australia and other regional coal mining markets.
Developing explosion-proof propulsion systems designed for the future of industrial automation.
Developing motors certified for Group IIB+H2 and Group IIC atmospheres. This research ensures safety in hydrogen generation, transport, and storage facilities globally.
Testing nano-composite stator insulation materials to improve thermal conduction. This design helps reduce stator hot-spots and extends motor service life in Class 1 Div 1 installations.
Creating integrated motor-inverter packages where the variable frequency drive is housed within a flameproof enclosure on the motor body, reducing cabling complexity and EMI risks.
Expert answers to common engineering and sourcing questions regarding Class 1 Div 1 and explosion-proof motors.
A: Class 1 Div 1 is a North American standard defined by the NEC (National Electrical Code), covering environments where flammable gases, vapors, or liquids are present under normal operating conditions. Zone 1 is an international classification under the IECEx/ATEX schemes. While similar, they differ in testing methods, temperature classifications, and terminal box designs. Our multi-certified motors can meet both specifications.
A: Yes, but the motor must be certified for inverter duty. VFD operation introduces harmonic heating and voltage spikes (high dV/dt). Our motors utilize Class H insulation systems and verified thermistor combinations to prevent surface temperatures from exceeding the rated temperature class (T-code) during VFD speed regulation.
A: Each design undergoes explosion testing, where the motor is placed in a test chamber filled with an explosive gas mixture. The gas inside the motor is ignited, and the frame must contain the explosion without igniting the surrounding atmosphere. Standard testing also includes hydrostatic pressure tests on the cast iron enclosure, insulation resistance, and dynamic balancing.
A: We offer engineering customization to match standard NEMA and IEC frame sizes. Our design team can customize mounting flanges (C-face, D-flange), shaft extensions, and keyway shapes to match the footprint of existing pumps, gearboxes, or blowers.
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