High-efficiency, explosion-proof, and custom-engineered electric motor drive systems designed for hazardous, marine, and heavy industrial fluid power applications worldwide.
Select premium three-phase asynchronous, high-voltage, and explosion-proof motors with worldwide compliance certificates.
Shaanxi Nanfang Motor Technology Co., Ltd. stands as the premiere authorized distributor of Wolong (Wolong Electric Drive Group Co., Ltd.). Founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (Ticker Code: SH600580), Wolong has transitioned from a localized motor manufacturing shop into an absolute global giant.
Currently operating 3 massive manufacturing bases, 39 state-of-the-art factories, and 3 localized R&D centers worldwide, Wolong focus on the engineering, construction, testing, and lifecycle distribution of advanced electric motors and drive control systems. Integrating a global brand strategy, Wolong leverages decades of European, Asian, and American research to produce premium-grade motors for critical infrastructure, oil, gas, maritime logistics, and high-pressure hydraulic pumping sectors.
LEARN MORE ABOUT USUnparalleled reliability under harsh ambient temperatures, extreme mechanical vibration, and hazardous gaseous atmospheric conditions.
Comprehensive explosion-proof compliance certificates spanning multiple classifications (Ex d, Ex de, Ex e, Ex nA) ensuring safe hydraulic pressure generation within Zone 1, Zone 2, Zone 21, and Zone 22 hazardous fields.
Supplying premium IE3, IE4, and ultra-premium IE5 motor configurations. We leverage advanced rotor dynamics and rare-earth Permanent Magnet (PM) technologies to cut parasitic energy losses in high-duty hydraulic loops.
An extensive industrial catalog spanning low-voltage asynchronous, high-voltage explosion-proof AC drives, marine-certified synchronous motors, and distributed condenser systems engineered for grid stability.
How Wolong brought together the world’s most trusted motor manufacturers to build a unified technology and service powerhouse.
Wolong initiated strategic joint ventures with OLI, establishing a global foothold in industrial vibration technology and sensor applications.
Wolong acquired 97.94% of the ATB Group, absorbing century-old European brands Laurence Scott (specializing in low-starting-current naval power), Morley (famed for coal mining flameproof motors), and Schorch (the standard for petrochemical drive systems).
China's premier high-voltage, explosion-proof research and manufacturing base officially integrated with Wolong, strengthening domestic and international Ex-certified supply chains.
Wolong acquired GE's commercial and industrial motor division, alongside the integration of Brook Crompton, achieving a comprehensive product offering across NEMA and IEC markets.
Mitigating regulatory risk with certified quality management, explosion protection, and marine type-approvals.
Harmonized European standards compliance for explosive atmospheres.
North American safety listing for industrial machinery and motor controls.
Declaration of compliance with European health, safety, and eco-design directives.
China Compulsory Certification for explosion protection and safety.
South African Bureau of Standards quality compliance certification.
Australian coal mining and heavy industrial explosive testing standard.
Wolong has secured the majority of product certifications, enabling it to penetrate the international market and navigate localized technical barriers with ease:
An engineering breakdown of the core elements that ensure high starting torque, thermal management, and robust protection classes.
The rotor features a highly reliable squirrel cage design. Cast aluminum rotors are produced using centrifugal aluminum casting or precision die-casting techniques, where molten pure aluminum is poured into the slots of the rotor core. This results in a single-piece construction that integrates the rotor bars and end rings.
For larger capacity and high-voltage motors, copper bar rotors are employed, benefiting from dependable bar securing and advanced end-ring welding procedures. The protective ring design of high-speed motors further ensures safe, long-term operation of the copper bar rotor under heavy hydraulic loads.
The stator coil is crafted from premium polyester film reinforced with glass cloth, utilizing low-powder or medium-powdered mica tape with a high mica content. Following the winding phase, the entire assembly undergoes the VPI (Vacuum Pressure Impregnation) process.
VPI ensures that the varnish deeply penetrates the insulation layers, leaving a pristine, void-free finish. This meticulous engineering provides exceptional electrical performance, mechanical strength, resistance to moisture, and thermal stability (Class F or Class H insulation systems).
The motor frame employs a fully digital design platform for structural and fluid multi-physics field simulations. This allows us to optimize the cooling rib arrangement, ensuring efficient thermal dissipation under continuous operating conditions.
Utilizing mature, high-strength cast iron (or steel as an alternative), the frame boasts exceptional structural redundancy, outstanding heat dissipation properties, and ample inherent frequency isolation margins. This design enables the machine to endure significant mechanical shocks, minimize vibration, and ensure low temperature rises.
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 layout to avoid obstacles behind the motor. This minimizes adverse effects on ventilation and reduces noise caused by energy loss during air propagation. Incorporating sound-absorbing materials, the system lowers overall motor noise while maintaining an IP22 rating (or higher) to prevent accidental contact with the rotating fan blades.
Strategic insights from our SEO Growth & Technical Engineering teams, detailing the future of hydraulic drive systems.
In modern heavy industries, unscheduled downtime can cost millions. Integrating vibration sensors (such as our OLI-compatible diagnostic systems) and thermal sensors directly into the motor frame allows for real-time condition monitoring. This shift from reactive maintenance to predictive maintenance helps operators identify bearing wear and stator overheating before a breakdown occurs.
Our CE-certified motors can be integrated with smart VSD (Variable Speed Drive) systems, enabling soft-starts and dynamic speed adjustments that align with varying hydraulic pump pressures, reducing system wear.
As industrial plants look to lower energy costs, they are shifting from low-voltage systems to high-voltage configurations. Using high-voltage motors (like our YBXKK or YBBPX series) reduces current draw and cable sizing, leading to lighter electrical infrastructure.
This transition requires robust insulation materials to handle voltage spikes. Our VPI-processed, mica-insulated stators are engineered to withstand these spikes, ensuring long-term reliability in high-voltage setups.
| Parameter / Standard | IEC (International / EU) | NEMA (North American) | China (GB Standards) |
|---|---|---|---|
| Efficiency Classifications | IE1, IE2, IE3, IE4, IE5 | Standard, Energy Efficient, Premium | Grade 3, Grade 2, Grade 1 (YE3, YE4) |
| Explosion Protection | ATEX / IECEx (Zones 1, 2, 21, 22) | Class I/II, Div 1 & Div 2 | CCC Ex (Zones 1, 2, 21, 22) |
| Frame Dimensions | Metric (mm) e.g., 355 ~ 560 | Imperial (inches) e.g., NEMA 449T | Metric (GB/T standardized) |
| Design Approvals | CE, DNV (Marine), Nemko | UL Listing, CSA Approval | CQST, CNE Group Standard approvals |
Where our high-performance motor technology meets heavy-duty fluid power systems.
Driving high-pressure hydraulic pumps in hazardous, gaseous areas requires flameproof enclosures (Ex d/de) that prevent internal sparks from igniting external vapors. Our ATB and Schorch brands are standard choices for refineries worldwide.
Operating shearers, water pumps, and heavy hydraulics requires dust-ignition-proof certifications (Ex tD). Our Morley and Nanyang explosion-proof series provide the reliability needed to perform under high mechanical shocks and dust loads.
Salty, humid environments degrade standard steel frames. Our YQ series low-voltage marine motors feature DNV Type Approval certificates, anti-corrosive coatings, and IP56/IP66 enclosure protection to withstand offshore challenges.
Clear answers to common questions about hydraulic pump electric motors, safety standards, and global logistics.
CE certification indicates that the motor complies with all applicable European safety, health, and environmental protection directives. For hydraulic applications, this means the motor has passed testing for electromagnetic compatibility (EMC), low voltage directives, and machinery safety, ensuring it can be legally sold and operated within the EU and aligned regions.
VPI replaces traditional dip-and-bake insulation methods. Under a vacuum, air bubbles and voids in the stator windings are removed, allowing the insulating resin to fully penetrate the slots. This creates a solid, moisture-resistant barrier that improves heat dissipation, structural rigidity, and electrical insulation strength.
ATEX is a European directive based on safety zones (Zones 0, 1, 2). IECEx is a global standard system aligning with many of the same zones. NEMA standards categorize hazardous areas by Class (Class I for gas, Class II for dust) and Division (Division 1 for continuous presence, Division 2 for abnormal conditions). Wolong manufactures motors to meet both metric IEC/ATEX and imperial NEMA/CSA standards.
Yes, permanent magnet synchronous motors (PMSM) are excellent for variable displacement hydraulic pumps. They offer higher power density and maintain high efficiency even at low speeds and partial loads. When paired with a VSD, they provide precise torque control and lower energy use compared to standard induction motors.
Our motors are constructed with high-grade grey cast iron (GG25 or GG30) for heavy industrial use, providing excellent structural rigidity and vibration absorption. For marine applications, we apply multi-layer epoxy coatings and use stainless steel external hardware to protect against salt corrosion.
A glimpse inside our global manufacturing bases, showing R&D facilities and production floors.
Select high-voltage, NEMA-compliant, and heavy-duty flameproof water/hydraulic pump motors.
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