High-Performance Rotating Machinery for Marine, Mining, and Oil & Gas Industries
Modern heavy industries are undergoing a massive transition towards higher voltage levels to optimize energy efficiency and grid stability. Motors operating at up to 13800 V (13.8 kV) are vital for processes requiring megawatt-range outputs. By elevating operating voltage, global manufacturing enterprises significantly reduce current values, allowing for thinner power cabling, decreased transmission losses, and reduced transformer weight.
In regions like North America, the Middle East, and Australia, heavy industrial networks rely heavily on 13.8 kV grids. Standardizing on 13.8 kV motors simplifies substation design by eliminating intermediate step-down transformers. Global procurement managers now prioritize suppliers that can deliver certified high-voltage machines that comply with both IEC and NEMA guidelines.
High-voltage motors up to 13.8 kV are specialized assets designed for major mechanical systems. Common industrial demands include:
Shaanxi Nanfang Motor Technology Co., Ltd. is the authorized distributor of Wolong Electric Drive Group Co., Ltd. Founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (code SH600580), Wolong has grown to become a dominant force in international motor manufacturing.
With 3 major manufacturing bases, 39 state-of-the-art factories, and 3 global R&D centers, Wolong operates a truly international supply and technological network. Focusing on motors and drive control systems, Wolong integrates advanced R&D with global manufacturing capability, offering world-class efficiency, explosion protection, and customizable power solutions.
By integrating iconic, century-old motor brands, Wolong has unified global technical excellence:
Digital Physics Field Modeling & Robust Physical Materials for 13.8kV Operation
Designing motors that operate continuously at up to 13800 V requires extreme precision in mechanical structure and insulation engineering. Wolong utilizes multi-physics simulation platforms to model fluid dynamics, thermal dissipation, and electromagnetic fields, guaranteeing structural redundancy and long-term durability under demanding industrial cycles.
Stator windings at 13.8kV face high electrical stress and corona risks. The coils are insulated using polyester film-reinforced glass cloth and high-density, low-powder or medium-powder mica tapes. Following wire placement, the complete stator undergoes a meticulous Vacuum Pressure Impregnation (VPI) cycle, creating a solid insulation block. This provides high dielectric strength, moisture proofing, resistance to chemical corrosion, and thermal stability.
Rotor assemblies are engineered according to application demands. For standard duties, squirrel-cage rotors are cast using high-purity aluminum via centrifugal or die-cast techniques to form integrated rotor bars and end rings, delivering excellent starting torque. For heavy-duty or higher-capacity machines, copper bar rotors are used. These feature robust bar locking and precision end-ring welding, with protective rings to prevent centrifugal distortion during high-speed runs.
The motor frame is designed using structural and fluid dynamic simulations to ensure high rigidity and efficient heat transfer. Made from high-grade cast iron or fabricated steel plates, the frame provides robust mechanical protection and limits resonance frequencies to prevent vibration. This helps control overall vibration levels and temperature rise, ensuring reliability in aggressive industrial conditions.
The ventilation system features a compact fan hood, air guide cylinders, protective grilles, and silencer plates. It includes an optimized side air inlet that bypasses rear physical blockages to maintain airflow while reducing noise from turbulence. Built-in sound-damping panels reduce operating noise, and the IP22 enclosure rating keeps personnel safe from contact with moving parts.
We offer motors certified to ATEX, IECEx, and EAC standards for hazardous environments. These include Flameproof (Ex d), Pressurized (Ex p), and Non-Sparking (Ex nA) variants, providing safe operation in zone 1 and zone 2 areas across chemical plants, gas pipelines, and underground mines.
Our products meet IE3, IE4, and IE5 energy efficiency standards. We also manufacture permanent magnet synchronous motors (PMSM) that maintain high efficiency under variable speed drive (VSD) operations, helping industrial users reduce energy consumption and operating costs.
Our product line supports diverse applications, from large marine propulsion drives to compact coal shearers. We supply turn-key drive packages containing customized soft starters or variable frequency drives, ensuring compatibility with your facility's power supply.
Adhering to Demanding Industrial Quality Frameworks Worldwide
Shaanxi Nanfang Motor and Wolong supply products that meet major global standards, enabling seamless integration into international projects and industrial plants.
Nemko / ATEX
CSA Standard
CE Directives
CCC Ex
SABS Standard
TESTSAFE
ISO 9001 Standard: Our manufacturing processes are fully compliant with ISO 9001 quality management standards, supporting consistent production quality and supply chain reliability.
NEMA Standard: For North American projects, we supply motors built to NEMA mechanical and electrical standards. They undergo testing for efficiency, starting currents, insulation resistance, and vibration levels, and carry UL and CSA approvals.
IECEx & ATEX Standards: For hazardous locations, our products are certified to European (ATEX) and international (IECEx) explosion-proof directives, allowing safe installation in areas containing flammable gases or dust.
TESTSAFE Standard: Testsafe certification facilitates the supply of Chinese-manufactured coal mining motors to the Australian mining market, confirming compliance with local underground safety standards.
Designing the Next Generation of Decarbonized & Smart Drive Technologies
The global drive technology landscape is evolving to prioritize integration with intelligent monitoring networks and increased operating efficiency. Wolong's technology roadmap focuses on combining advanced material science with digital diagnostic capabilities.
In support of global carbon reduction targets, we continue to expand our range of ultra-high-efficiency motors. By combining permanent magnet designs with optimized rotors, these motors help lower energy losses in continuous industrial applications.
Additionally, our synchronous condenser packages provide reactive power support to electrical grids, helping manage the integration of renewable energy sources.
Answering Engineering and Compliance Questions for Procurement Teams
Standard, Permanent Magnet, and Heavy Duty Positive Pressure Motors
Precision Assembly Lines and Rigorous Electrical Testing
Every high-voltage motor undergoes performance testing before shipment, including insulation resistance checks, load tests, starting torque validation, and vibration measurements. This rigorous quality control ensures that each machine delivers the required reliability for demanding industrial applications.
Contact our sales and engineering team for technical datasheets, CAD dimensional drawings, or custom quote requests for projects requiring operating voltages up to 13800 V.
Contact Our Engineering Team
NANFANG