Explore our top tier medium voltage, flameproof, and asynchronous motor systems certified under global standards for heavy-duty industrial applications.
Authorized partnership accelerating the next generation of smart manufacturing and medium voltage motor technologies globally.
As the authorized primary distributor of Wolong Electric Drive Group Co., Ltd. (founded in 1984, listed on the Shanghai Stock Exchange, code SH600580), we serve as a vital link between world-class motor engineering and industrial operations globally. With over 30 years of continuous technical iteration, Wolong operates 3 major manufacturing bases, 39 high-capacity factories, and 3 state-of-the-art research centers globally.
Our focus revolves around the design, optimization, supply, and lifecycle maintenance of heavy industrial medium voltage (MV) and high voltage (HV) electric motors. By integrating elite engineering expertise with local technical support networks, we guarantee that your drive applications operate with optimized power density, maximum uptime, and industry-leading safety protocols.
Custom engineering solutions engineered to withstand extreme mechanical loads, harsh climates, and high-consequence hazardous environments.
Tailored explosion-proof topologies (including Flameproof Ex d, Increased Safety Ex e, and Pressurized Ex p) designed specifically for petrochemical refinery processes, coal mining operations, and volatile chemical plants. Our products meet global standards for zone-classified hazardous locations.
Our medium voltage permanent magnet synchronous motors (PMSM) and frequency-controlled induction motors optimize energy conversion. We provide advanced systems designed to cut total ownership cost (TCO) and reduce carbon emissions for high-power industrial equipment.
From water treatment facilities with high-capacity pumps to pipeline compressor systems and large-scale mining conveyors, our design experts configure cooling type, mounting option, and shaft specifications to fit your plant's footprints perfectly.
Through strategic acquisitions of the world's most reputable motor brands, Wolong has unified global technical leadership and manufacturing excellence.
Schorch (founded in 1882) established standards for heavy-duty industrial motors. In 2011, Wolong acquired 97.94% of the Austrian ATB Group, integrating the ATB brand, Morley (specialized in rugged underground coal mines), and Laurence Scott (renowned for low starting current nuclear sector generators).
Brook Crompton brought over a century of electric motor design expertise. Renowned for pioneered energy-efficient designs, they developed the premium "W" and "10" series low, medium, and high voltage AC motors suited for harsh operating environments.
Dating back to 1999, Wolong collaborated with OLI vibration motor and Ex vibration sensors. In 2015, China's largest explosion-proof research and manufacturing base, CNE (Nanyang Explosion-proof Group), officially joined Wolong to drive advances in safety-critical drive platforms.
General Electric's (GE) commercial and industrial motor division joined Wolong. GE's century-long legacy in heavy industries (petroleum, water treatment, mining, cement) brought unmatched engineering reliability and NEMA-standard design expertise to our global footprint.
A look inside our medium voltage motors, showcasing advanced material sciences and design validation platforms.
Our rotors feature premium squirrel cage designs engineered for reliable starting torque and high operational loads. Cast aluminum rotors are produced using centrifugal casting or advanced die-casting techniques, ensuring a single-piece construction that integrates rotor bars and end rings.
For high-capacity medium voltage motors, we employ high-conductivity copper bar rotors. These benefit from mature bar-securing processes and automated end-ring welding. For high-speed applications, specialized alloy retaining rings ensure physical stability and prevent deformation under centrifugal stress.
The reliability of a medium voltage motor depends heavily on its insulation. Our stator coils are crafted with multi-layered polyester film reinforced with glass cloth, using high-content, low-powder mica tape. This structure is integrated through the Vacuum Pressure Impregnation (VPI) process.
After extraction and insertion, the complete stator winding undergoes automated thermal curing. The resulting VPI system provides high dielectric strength, excellent mechanical protection, moisture resistance, and thermal endurance. This allows the motor to withstand voltage spikes and thermal cycles over decades of service.
Our motor frames are optimized using digital multi-physics simulation platforms, validating structural dynamics and fluid cooling flow. We use high-tensile cast iron or welded steel structures that offer excellent thermal dissipation and vibration dampening.
By establishing sufficient frequency isolation margins, the motor frame avoids resonance during operation. This robust design protects internal components from severe external mechanical shocks, maintains low vibration levels, and reduces hot spots within the motor housing.
The cooling fan system consists of a dynamically balanced fan, an air guide cylinder, protective mesh windows, and integrated silencer plates. It is designed to optimize airflow while minimizing aerodynamic noise.
The side-mounted air intake system prevents backpressure issues when the motor is installed near walls or other machinery. Combined with internal sound-absorbing acoustic liners, it reduces overall noise levels. The fan cover meets IP22 standards, keeping operators safe while maintaining cooling efficiency.
Our manufacturing facilities and motor configurations comply with international safety, energy, and environmental standards.
ATEX / Nemko
IECEx Standard
CSA Standard
CE Standard
SABS Standard
TESTSAFE Ex
To support global supply chains, Wolong maintains a comprehensive certification portfolio for its electric motors:
How our drive systems are deployed across various regions and industries to keep operations running smoothly.
Brand: Morley. Morley's wet and dust-filled underground environments require highly durable frame structures and excellent thermal management. Certified with TESTSAFE, our high-voltage conveyor and shearer motors deliver reliable torque and flameproof safety for deep-underground operations.
Brand: GE / NEMA Standard. In pipeline compressor stations across North America, medium voltage motors run continuously. Our NEMA-standard three-phase induction motors are configured with custom VFD packages, providing high efficiency, lower starting currents, and reliable operation in remote areas.
Brand: Laurence Scott. High-power nuclear cooling pump systems require low starting currents and robust electrical design to safeguard grid stability. Laurence Scott motors provide the reliable starting performance required for auxiliary power units and naval propulsion generators.
Leading the transition toward carbon-neutral industrial facilities with connected smart technologies.
As industries adopt digital manufacturing models, medium voltage motor monitoring is moving from reactive maintenance to AI-driven predictive diagnostics. Wolong is integrating smart IoT sensors into its MV motors to capture data on temperature rise, vibration patterns, magnetic flux deviations, and insulation leakage current.
This data is analyzed using cloud-based machine learning systems to predict winding breakdown risks, bearing wear, and structural imbalances before they cause unplanned downtime. Combining this with variable frequency drive (VFD) technology helps optimize energy consumption under fluctuating load profiles, reducing operational overhead.
Answers to common engineering questions regarding the selection, application, and maintenance of medium voltage motors.
A: For machinery drawing high power (typically above 200 kW to 300 kW), low-voltage motors draw high currents, requiring thick cables and causing high energy losses ($I^2R$). By increasing voltage (e.g., to 6kV or 10kV), current drops, allowing for smaller cables, lower losses, and improved system efficiency.
A: MV motors face high electrical stress. Air pockets within stator slots can lead to partial discharges (corona effect), which erode insulation over time. The VPI process removes air and moisture under a vacuum, then forces high-grade epoxy resin into the windings under pressure. This creates a solid, void-free insulation barrier that improves heat transfer and mechanical strength.
A: An Ex d (flameproof) motor is built with a heavy enclosure designed to contain an internal explosion without letting flames escape to the surrounding atmosphere. An Ex p (pressurized) motor maintains a positive pressure of clean air or inert gas inside the housing, preventing explosive external gases from entering. Ex p is often used for larger high-power motors where a heavy flameproof casing is impractical.
A: Large electric motors can draw starting currents 6 to 8 times their rated current, causing voltage drops on weak grids. We address this by designing motors with high-impedance rotors, using wound rotor designs, or integrating variable frequency drives (VFDs) to ramp up speed gradually and protect grid stability.
Advanced permanent magnet synchronous, variable frequency, and high-capacity wound rotor induction systems.
NANFANG
