Explore our elite range of global industrial standard HV asynchronous & wound rotor induction motors optimized for severe duties.
An authoritative breakdown of medium and high-voltage rotating electrical machinery in heavy industries.
In modern industrial infrastructure, High Voltage (HV) induction motors serve as the foundational prime movers. Across global mining operations, offshore oil platforms, hydrocarbon pipelines, water treatment facilities, and power generation plants, these machines convert massive amounts of electrical energy into reliable mechanical torque. Because industrial processes have grown increasingly continuous and large-scale, the demand for high-efficiency, explosion-proof, and variable frequency high-voltage motors has reached historic levels.
In the context of the global transition toward carbon neutrality, industrial plants face double-pronged pressure: to improve operational reliability and significantly reduce energy consumption. High-voltage asynchronous induction motors account for roughly 30% to 40% of industrial power consumption. Consequently, selecting an elite motor system is no longer just a purchasing decision—it is a core strategy to reduce Scope 2 greenhouse gas emissions, minimize downtime risk, and ensure regulatory compliance in dangerous operational zones.
Modern mega-factories require high-voltage motors that run reliably even on weak grids. Advanced wound rotor systems reduce startup current spikes and maintain excellent system power factor coefficients.
Global regulatory landscapes are mandating IE3 and IE4 minimum efficiency standards for electric motor drive systems. Transitioning to premium high-voltage solutions delivers swift ROI through reduced utility costs.
Petrochemical, chemical, and coal mining environments present constant explosive gas and dust hazards. Certified flameproof and explosion-proof motors prevent ignition hazards under high pressures and extreme temperatures.
Shaanxi Nanfang Motor Technology Co., Ltd. is the authorized global distributor of Wolong. Wolong Electric Drive Group Co., Ltd. was established in 1984 and listed on the Shanghai Stock Exchange in 2002 (code SH600580). Over three decades of growth, Wolong has built 3 key manufacturing bases, 39 manufacturing plants, and 3 global research and development centers.
By executing a focused global brand integration strategy, Wolong has brought together some of the world's most historic and advanced motor brands, establishing itself as a global leader in high-voltage motor research, process design, and manufacturing quality.
How Wolong integrated over two centuries of European and American motor engineering excellence.
A deep dive into the materials, simulations, and processing technologies that ensure long service lives for our high-voltage motors.
Our rotors feature robust designs engineered for heavy starting cycles. We utilize centrifugal aluminum casting and advanced die-casting methods, which integrate the rotor bars and end rings into a solid structure. This single-piece construction delivers excellent thermal capacity and high mechanical strength.
For larger high-voltage applications, copper bar rotors are used. The copper bars are secured into the rotor slots and welded to the end rings. High-speed models also incorporate high-strength retention rings, protecting the copper bars from centrifugal forces and ensuring stable operation at high speeds.
The stator coils are insulated with high-grade polyester film and glass-reinforced mica tape. These insulated coils undergo our Vacuum Pressure Impregnation (VPI) process, forming a solid, void-free insulation system.
VPI ensures excellent moisture protection, mechanical strength, and thermal stability. This enables the motor to withstand constant thermal cycling and transient overvoltages common in industrial networks without insulation degradation.
The motor frames are designed using finite element analysis (FEA) and fluid dynamics software. Cast from high-strength iron or fabricated from heavy structural steel, the frames are engineered to minimize vibration and resist external mechanical stresses.
Designed with generous thermal safety margins, the frames ensure optimal heat dissipation. Their structural stiffness helps keep internal vibration levels well below ISO 10816 limits, extending the service life of the bearings and seals.
The fan and hood assembly is optimized for efficient cooling with minimal noise. By using aerodynamic fan profiles, side air inlets, and acoustic absorption materials, our cooling systems reduce windage noise and operating temperatures.
This design also minimizes ventilation blockages in confined industrial spaces. With an IP22 rating, the fan cover prevents debris ingress and contact with rotating components while maintaining consistent cooling airflow.
Our motors carry international certificates, enabling installation in highly regulated hazardous locations worldwide.
Nemko / ATEX
CSA Standard
CE Conformity
CCC Mark
SABS Standard
TESTSAFE
Our commitment to rigorous testing helps users bypass international trade barriers, ensuring our motors meet local regulatory standards directly upon delivery.
For applications in hazardous environments containing explosive gases or combustible dusts, our high-voltage motors are certified to IECEx and ATEX standards. These certifications ensure the motors operate safely in explosive zone configurations (Zone 1, Zone 2, Zone 21, and Zone 22) across Europe and globally.
Our production facilities operate under ISO 9001 certified quality management systems. This standard governs every phase of production, from raw material procurement to stator winding, VPI insulation, rotor balancing, and final full-load routine testing.
To serve North American industries, our motors are built and tested in accordance with NEMA MG1 standards. Key testing protocols include stator winding insulation resistance testing, temperature rise measurements, starting torque verification, and vibration analysis. Low-voltage models carry UL and CSA approvals.
TESTSAFE certification simplifies the entry of mining motors into Australia and other major mining markets. This ensures our flameproof and mining-duty drive systems meet the safety standards required for underground coal and mineral mining operations.
Providing reliable drive systems for critical machinery in demanding applications.
Our motors are designed to drive high-capacity centrifugal pumps, natural gas compressors, and oil transport pumps. With certified flameproof and dust-proof enclosures, these motors operate reliably in severe outdoor and offshore environments.
We supply heavy-duty slip ring (wound rotor) motors for overland conveyors, ball mills, and grinders. These motors deliver high starting torque and manage high-inertia loads without straining the electrical grid.
Our motors drive boiler feed pumps, cooling water pumps, and draft fans in power plants. Designed for high efficiency and low maintenance, they help plants optimize their internal power consumption.
We provide large-scale vertical and horizontal motors for municipal water supply systems, desalination plants, and irrigation projects. These motors are engineered for long service lives in continuous-run operations.
Our commitment to research and development guides the next generation of industrial drive systems.
Industrial electrification requires constant development in motor efficiency, diagnostic monitoring, and system integration. Our R&D efforts focus on three primary pillars:
Technical answers to key engineering and procurement questions about high-voltage induction motors.
A comprehensive selection of explosion-proof, dust-proof, and high-efficiency low-voltage motors.
NANFANG
