Explore our highly certified variable frequency and explosion-proof synchronous & asynchronous AC motors engineered for severe duty environments.
Addressing the shifting paradigm in high-output power generation, electrification, and international energy compliance standards.
In the modern industrial landscape, the demand for high-speed AC motors is witnessing unprecedented growth. Driven by macro-level sustainability directives, the global processing industries—ranging from oil and gas extraction to municipal wastewater management and heavy metal smelting—are shifting away from carbon-heavy drive configurations. As an authorized global distributor of Wolong Electric Drive Group, Shaanxi Nanfang Motor Technology Co., Ltd. is positioned at the intersection of raw engineering innovation and targeted application compliance.
High-speed rotating machinery operates under strict physical and thermal limits. Unlike standard utility induction motors, high-speed and permanent magnet synchronous motors (PMSM) must balance structural rigidity with optimized thermal dissipation. This is particularly vital in environments where variable speed drive (VSD) systems control the dynamic loading of compressors, turbo-blowers, and high-pressure pumps. Ensuring motor survivability and operational safety at elevated frequencies requires advanced stator core laminations, robust rotor retention sleeves, and resilient Class H VPI insulation systems.
Connecting Wolong's global technological footprint with local industrial requirements.
Shaanxi Nanfang Motor Technology Co., Ltd serves as the authorized 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 include 3 global manufacturing bases, 39 individual production factories, and 3 state-of-the-art research and development centers worldwide. This expansive infrastructure allows Wolong to remain a global leader in motor design, process controls, and specialized distribution networks.
A core element of Wolong's competitive advantage lies in its strategic acquisition of renowned, century-old motor brands. By integrating specialized global manufacturers, Wolong has synthesized centuries of engineering experience into a single portfolio:
In 2011, Wolong expanded its technical capabilities by acquiring 97.94% of the Austrian ATB Group. As one of Europe's top three motor manufacturers, ATB brought highly specialized product lines into the Wolong fold, including the prestigious Morley mining motor line and Laurence Scott heavy industrial engineering.
Morley Motors: Boasting nearly 130 years of history, Morley is synonymous with high-power, reliable underground coal mining motors. They specialize in high-specification, explosion-proof equipment for severe duty mining environments.
Laurence Scott: Renowned for manufacturing low-starting-current motors, Laurence Scott has supplied equipment for British nuclear power plants and generators for naval vessels, receiving the Queen's Award for three consecutive years.
Brook Crompton Motors: As an industry pioneer with over 100 years of experience, Brook Crompton has driven the development of energy-efficient motor designs. Their portfolio includes low, medium, and high-voltage AC motors like the premium "W" and "10" series, designed for harsh and hazardous industrial environments.
Schorch Electric Motor: Founded in 1882, Schorch joined Wolong in 2011. Schorch provides drive systems for challenging projects in oil and gas, petrochemicals, power generation, water management, shipbuilding, and steel processing.
OLI Brand: Established in 1999 as a joint venture with Wolong in China, OLI is a global leader in industrial vibration motors (MVE) and Ex vibration sensors.
Nanyang Explosion Group (CNE): Joining Wolong in 2015, CNE is China's largest research and production base for explosion-proof motors. Their products are widely used in hazardous fields such as petroleum, coal, chemical processing, metallurgy, nuclear power, and defense applications.
General Electric (GE) Industrial Motor Alliance (2018): In 2018, Wolong integrated GE's commercial and industrial motor division. This partnership brought GE's design expertise in heavy-duty oil & gas, mining, water treatment, and materials processing motors into Wolong's global network.
Minimizing operating costs and boosting system reliability through advanced design and certification.
Our motors carry global explosion-proof certifications, allowing operators to deploy our equipment across hazardous locations worldwide, from oil wells to underground coal faces.
We supply motors meeting IE3, IE4, and ultra-premium IE5 efficiency standards. Our permanent magnet synchronous motors (PMSM) reduce electrical losses, lowering the total cost of ownership.
Our product range covers everything from low-voltage marine auxiliary motors to large, high-voltage variable-frequency drives for pipeline compressors, ensuring we meet diverse industry requirements.
With R&D centers located in China, Europe, and Japan, as well as a central research institute in Shanghai, Wolong drives innovations in motor materials, electromagnetic design, and power electronics. This research network ensures our products match the performance levels of any global manufacturer.
An engineering look at the materials, construction methods, and design parameters of our AC motors.
Our squirrel-cage rotors utilize centrifugal cast aluminum or die-cast techniques to form a single-piece construction of rotor bars and end rings. This design minimizes rotor bar resistance and provides reliable starting torque.
For high-capacity, high-voltage machines, copper bar rotors are used. The joints are secured using automated induction welding, while high-speed designs incorporate retaining rings to prevent radial distortion at high RPMs.
Our stator windings use high-grade polyester-imide enameled copper wire, insulated with glass-cloth reinforced mica tape. This ensures reliable insulation and resistance to corona discharge under high dV/dt inverter stresses.
The complete stator core undergoes a Vacuum Pressure Impregnation (VPI) process using solvent-free epoxy resins. This creates a solid structure with excellent moisture resistance, high mechanical strength, and superior thermal dissipation.
Designed using multi-physics structural and fluid dynamic simulations, our motor frames are cast from high-strength grey iron (or fabricated structural steel for larger sizes). This provides rigid support and minimizes vibration.
The design isolates structural natural frequencies from the rotating speed range, preventing resonance. External cooling fins are optimized to maximize heat transfer under low-speed, high-torque operating conditions.
Our ventilation system comprises a lightweight fan cover, integrated air guide cylinders, protective screens, and sound-absorbing acoustic linings. This design reduces flow losses and keeps operating noise levels low.
The side-entry air inlet design prevents obstruction behind the motor housing. Rated at IP22 minimum, the shroud prevents contact with rotating fan blades while maintaining adequate cooling airflow.
Ensuring compliance with major international standards and local industrial directives.
Navigating different national and regional standards is a key challenge for global procurement managers. Equipment used in oil refineries, deep coal mines, or marine vessels must meet local safety certifications before installation. Wolong's comprehensive testing programs ensure our motor families comply with major international standards:
Nemko / ATEX
CSA
CE
CCC
SABS
TESTSAFE
Our technical teams work directly with EPC contractors to integrate motors into wider drive systems. This includes running torsion analysis on the drive shaft, matching the motor's insulation with VFD output characteristics, and selecting the appropriate bearing arrangements for heavy-duty belt or direct-drive coupling.
With service centers and partner networks across Europe, Asia, and the Americas, we provide commissioning support, alignment checks, and warranty services. This minimizes downtime and ensures the equipment is correctly set up from day one.
Deploying specialized high-performance drives across major heavy industries.
Wolong's motors are engineered for demanding roles across major industrial sectors, where reliability and efficiency are critical:
Powers high-voltage pipeline compressors, oil injection pumps, and refinery ventilation fans. Our explosion-proof designs are rated for continuous operation in Zone 1 and Zone 2 environments.
Our heavy-duty motors drive coal shearers, armored face conveyors, and exhaust ventilation fans, featuring dust-ignition-proof frames and water-jacket cooling options.
DNV-approved low-voltage motors driving auxiliary bilge pumps, cooling water circulation loops, deck winches, and thrusters, designed to resist salt spray and marine corrosion.
Next-generation motor designs focusing on permanent magnet technology and digital health monitoring.
As industrial processes require higher efficiency and precision, our technology roadmap focuses on two main areas:
Our permanent magnet synchronous motors (PMSM) offer higher power density and efficiency compared to standard induction motors, particularly under partial load conditions. By embedding high-coercivity rare earth magnets into the rotor, we eliminate rotor slip losses. This reduces operating temperatures, prolongs bearing life, and lowers energy consumption for variable-speed applications.
Modern plants are adopting predictive maintenance strategies. We are integrating vibration sensors, winding temperature detectors (RTDs), and insulation leakage monitoring into our motor designs. By feeding this data into local control systems or cloud-based analytics, operators can monitor motor health in real-time, predict potential failures, and schedule maintenance to avoid unplanned outages.
Answers to common technical questions regarding selection, operation, and compliance.
IE5 is the "Ultra-Premium" efficiency class defined by IEC 60034-30-2. IE5 motors reduce energy losses by approximately 20% compared to IE4 models. This is typically achieved using permanent magnet synchronous motor (PMSM) technology rather than standard squirrel-cage induction designs, especially in variable-speed applications.
VFDs introduce fast-switching voltage pulses (high dV/dt), which can stress stator windings and cause corona discharge. Vacuum Pressure Impregnation (VPI) coats the stator coils in a solid, void-free epoxy block. This design prevents winding movement, improves heat transfer, and protects the insulation system against voltage spikes from the drive.
The Wolong Nanyang WXF series is designed for emergency ventilation and high-temperature environments. It can run continuously under normal load, but is also certified to operate at elevated temperatures (such as 300°C or 400°C for up to two hours) in emergency smoke extraction scenarios.
DNV Type Approval indicates that the motor design has been verified and tested for marine environments. This ensures the motor can handle the vibration, humidity, salt corrosion, and voltage fluctuations typical of marine vessels and offshore platforms.
ATEX is a mandatory European Union directive that applies to both electrical and non-electrical equipment in explosive atmospheres. IECEx is an international certification scheme focusing specifically on electrical equipment. Most of our explosion-proof motors carry dual ATEX and IECEx certification, facilitating deployment in both EU and international markets.
Specialized marine motors, high-voltage induction drives, increased-safety synchronous motors, and heavy duty cutting units.
NANFANG
