High-Quality 3 Phase Electric Ac Motor Manufacturer & Companies

Empowering Global Heavy Industries with High-Efficiency, Explosion-Proof, and Advanced Intelligent Motor Drive Solutions

GLOBAL PARTNERSHIP

Authorized Global Distribution Partnership

Shaanxi Nanfang Motor Technology Co., Ltd. is the premium authorized distributor of Wolong. Wolong Electric Drive Group Co., Ltd., founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (code SH600580), has spent over three decades establishing itself as the world-leading developer of electric motor systems and drive controls. Today, Wolong operates 3 state-of-the-art global manufacturing bases, 39 specialized production factories, and 3 multinational R&D centers.

Through strategic integrations and direct technology alignment, Shaanxi Nanfang Motor delivers world-class industrial equipment designed for high durability and certified performance in extreme operations. We supply highly tailored three-phase AC motors equipped to satisfy safety parameters in hazardous environments, offering direct access to the global motor market's finest European, Asian, and American manufacturing lineages.

Wolong R&D Global Center
100+ Production Lines
58+ Exporting Countries
32+ Innovative Patents
200+ Mega Projects Completed

Our Solution & Global Brand Consolidation

Wolong has integrated the technological intellectual property of legendary motor companies. We construct complete driving packages combining high-efficiency operation, environmental sustainability, and explosion-proof compliance.

ATEX/IECEx/EAC Certified

Engineered for hazardous zones. Providing robust certification architectures (including ATEX, IECEx, CSA, UL, CU-TR/EAC) to verify safe operation in explosive atmospheres, volatile gas fields, and chemical process plants.

High Efficiency (IE3/IE4/IE5)

Delivering high-efficiency asynchronous motors and next-generation Permanent Magnet Synchronous Motors (PMSM) configured to IEC standards. Drastically reducing grid dependency and cooling load requirements.

Diversified Product Lines

Spanning custom marine auxiliary motors, high-torque mining conveyor systems, variable frequency induction systems, high-temperature fire-rated ventilation motors, and robust high-voltage non-sparking machinery.

Consolidating Century-Old Global Engineering Expertise

Wolong's growth includes the acquisition of the world's most reputable industrial names. In 2011, Wolong acquired 97.94% of the Austrian ATB Group (ATB Motor), positioning itself alongside the absolute elite of European motor design. The ATB group brought together legendary British and Continental marques:

  • Morley Motors: Featuring nearly 130 years of history, Morley is highly esteemed in underground coal mining systems. Morley motors are built to withstand maximum mechanical strain, shock loads, and toxic, humid coal faces.
  • Laurence Scott: Known for pioneering low starting current equipment, supplying specialized generators and auxiliary systems to nuclear plants and naval vessels.
  • Brook Crompton Motors: Boasting over a century of low, medium, and high-voltage AC motor design. Known for the premium "W" and "10" series and optimized speed drive packages.
  • Schorch Motors: Founded in Germany in 1882, setting international benchmarks in high-power driving systems for oil & gas, chemical plants, wastewater treatment, and steel fabrication.
  • GE Commercial & Industrial Motors: In 2018, General Electric's industrial motor division joined the Wolong portfolio, adding American heavy-duty engineering heritage.
  • OLI Vibration Motors (MVE): Wolong jointly developed the Chinese vibration technology division with OLI, establishing market leadership in precision sensors and vibration exciter solutions.
  • CNE (Nanyang Explosion-Proof Group): Joining Wolong in 2015, CNE represents China's premier explosion-proof research and manufacturing base.
ATB Motor Factory Production
Brook Crompton Motor Manufacturing
Schorch heavy duty motor factory
OLI Vibration motor technology

Deep-Dive Engineering & Component Construction

Our 3-Phase AC electric motors are developed using simulated structural, thermal, and electromagnetic multi-physics digital models. The high mechanical reliability is derived from optimized components.
1. High-Performance Rotor Assembly
Wolong Squirrel Cage AC Motor Rotor
The rotor utilizes a highly reliable squirrel cage design. For low-voltage standard machinery, cast aluminum rotors are cast using centrifugal aluminum or high-pressure die-casting processes. This merges the rotor bars and end rings into a solid, monolithic component. For heavy industrial high-voltage configurations, we apply copper bar structures with specialized braze-welded joints, reinforced by non-magnetic stainless steel retaining rings. This prevents rotor bar distortion under rapid acceleration and high-speed centrifuges.
2. Advanced VPI Stator Insulation
Advanced VPI Stator Insulation
Our stators are built with high-grade, low-loss silicon steel laminations wound with polyester-imide-coated copper wire. The winding layers are separated using mica tapes (high-mica content or medium-powder mica tape) combined with protective glass cloth. The completed stator is processed using VPI (Vacuum Pressure Impregnation). Under extreme vacuum and pressure cycles, standard solventless resins deeply penetrate the micro-cavities. This yields void-free insulation with Class H or Class F rating, offering moisture proofing, high dielectric strength, and optimal thermal dissipation.
3. Optimized Heavy Cast Iron Frame
Robust Cast Iron Frame Structure
Utilizing dynamic finite element analysis (FEA), the motor frames are cast from high-tensile grey cast iron or welded steel plates. The frame architecture includes optimized external cooling fins designed to balance convective heat transfer. The rigid frame structure is designed to isolate natural harmonic frequencies, preventing resonance during variable-speed operations. This layout absorbs high mechanical shocks, limits vibration transmission, and protects internal shaft alignments.
4. Low-Noise Fan Hood System
Low-noise fan cover system
The low-noise ventilation mechanism comprises a compact fan shroud, internal air guide cylinders, an entry guard window, and acoustic silencer panels. The side-entry air configuration bypasses rear obstacles to prevent backpressure. Using aerodynamics-based impeller designs, it minimizes turbulent flow and friction loss, significantly lowering acoustic output. The system holds an IP22 protection rating, preventing physical contact with the rotating fan blades.

Localized Application Scenarios in Heavy Industry

From remote sub-zero mining shafts to high-humidity offshore oil platforms, our three-phase AC electric motors are built to match local environmental demands.

Petrochemical & Natural Gas Refining

Explosion-proof YFB3, YBSS, and YBSD flameproof motors are engineered for Class I Division 1 and Zone 1/2 gas handling. They prevent internal sparks from igniting external hydrocarbons. Ideal for driving large high-pressure gas compressors, volatile fluid transfer pumps, and cooling tower fans.

Heavy Duty Underground Mining

Morley-engineered water-cooled and flameproof mining motors operate on primary conveyors, coal cutters, and deep ventilation shafts. Heavy-duty housings protect internal windings from moisture, grit, and impact in underground mine galleries.

Municipal Water & Wastewater Treatment

Supplying high-voltage vertical asynchronous motors and energy-efficient PMSMs (like the WEPM series) to drive continuous-run high-capacity axial intake pumps, primary mud aerators, and municipal effluent treatment systems, optimizing municipal power budgets.

Power Generation & Nuclear Facilities

Laurence Scott brushless synchronous systems are built for safety-critical auxiliary feed pumps and cooling loop circulation inside nuclear reactor islands and fossil fuel plants. Low starting current profiles prevent voltage drops in emergency backup generators.

Marine Propulsion & Auxiliary Systems

Motors with ABS, DNV-GL, and Lloyd's Register certifications operate on ocean-going vessels. These systems drive high-torque bow thrusters, bilge drainage pumps, deck cranes, and winch drives under salty, high-vibration maritime conditions.

Steel Mills & Metal Processing

High-temperature fire-induction motors (WXF series) and variable frequency induction motors run hot-rolling mills, slag processing areas, and combustion exhaust fans, maintaining continuous torque despite extreme heat and voltage harmonics.

China Factory Precision Motor Supply Chain
SUPPLY CHAIN DOMINANCE

China's Supply Chain Resilience & Efficiency

Our centralized manufacturing ecosystem integrates raw materials sourcing, high-precision casting, automated copper winding, and final testing under a unified quality control structure. This vertical integration buffers our supply chains against global shipping and raw material fluctuations.

By leveraging Wolong's consolidated Chinese manufacturing footprint, we offer highly optimized production timelines without sacrificing quality. High-precision laser laminating machines, automated VPI chambers, and robotized balance-calibration stations ensure high structural consistency across every production run. Consequently, global buyers benefit from cost efficiencies, rapid prototyping, and scalable production capacities that meet strict project delivery windows.

Global Compliance & Certifications Matrix

Wolong motors comply with leading international quality and safety benchmarks, streamlining imports and local regulatory clearances across global jurisdictions.
Wolong ATEX Ex Certification

ATEX Ex

Wolong ATEX System Certificate

ATEX ISO

Wolong IECEx Quality Assessment

IECEx Quality

ATEX Safe Execution Certificate

Safe Execution

Wolong ATEX Certification

ATEX Standard

ISO 9001 Ex Standard

Our manufacturing sites operate under certified ISO 9001 quality management structures. In hazardous locations, additional ISO 80079-34 requirements govern the production of explosive-atmosphere explosion-proof products.

NEMA & North American Codes

Low-voltage and medium-voltage models are tested to NEMA MG-1 standards, holding valid certifications from UL (Underwriters Laboratories) and CSA (Canadian Standards Association) for safe distribution in the United States and Canada.

ATEX & IECEx European Codes

For chemical, marine, and mining spaces within Europe, we provide CE-marked motors that comply with ATEX Directive 2014/34/EU and international IECEx standards, including Ex d (flameproof), Ex e (increased safety), Ex p (pressurized), and Ex n (non-sparking) classifications.

TESTSAFE Southern Hemisphere

Through Testsafe certification (Australia's primary authority for mining approvals), we maintain streamlined access for Chinese mining motors entering Oceanian mining projects, confirming that the equipment aligns with Australian safety regulations.

EAC / CU-TR Compliance

Providing CU-TR 012 (explosive atmospheres safety) and CU-TR 004 (low voltage safety) certificates, enabling smooth customs processing and plant installations throughout the Eurasian Economic Union (EAEU).

Additional Regional Compliance

Our product portfolio also carries local certifications such as SABS (South Africa), CC (China Compulsory Certificate), and standard CE configurations, ensuring compliance in diverse regional markets.

Technical Roadmap & Future Outlook

We design our three-phase AC systems to adapt to changing industrial standards. Our technical roadmap focuses on three main developments:

1. Next-Generation IE5 Permanent Magnet Technology

We are shifting our product lines toward permanent magnet synchronous designs (PMSM). By replacing aluminum squirrel cages with neodymium iron boron (NdFeB) rotors, we eliminate rotor copper loss, maintaining IE5 efficiency even at partial loads.

2. Integrated Smart IoT Sensors

Future Wolong drives will feature integrated vibration, temperature, and magnetic flux sensors. Using edge computing, these systems process operational data to flag anomalies before bearing or winding issues cause unplanned downtime.

3. Digital Twin Product Customization

Using cloud-linked multi-physics software, we can customize parameters like starting torque and thermal tolerance to match specific local loads. We simulate performance digitally prior to physical manufacturing.

Technical FAQ: 3-Phase AC Electric Motors

Frequently asked questions regarding international safety standards, customizable options, and motor retrofitting.
What are the primary differences between Flameproof (Ex d) and Increased Safety (Ex e) motors?
Flameproof (Ex d): The motor housing is engineered to contain any internal explosion, preventing internal sparks or burning gases from escaping and igniting surrounding explosive atmospheres. The joints between parts are designed as flame paths to cool escaping gases below ignition temperatures.

Increased Safety (Ex e): The motor is designed to prevent sparks, arcs, or excessive temperatures from occurring on internal or external components during standard operation. This design relies on strict tolerances, enhanced insulation, and thermal monitoring to avoid ignition hazards.
How does Vacuum Pressure Impregnation (VPI) protect motors in marine and high-humidity applications?
The VPI process extracts air and moisture from the stator windings using a deep vacuum, followed by the application of solventless resin under pressure. This fills all voids, creating a solid, moisture-resistant barrier that protects against airborne salt, high humidity, and thermal cycling, helping prevent winding short circuits.
Can Wolong variable frequency speed regulation motors (YBBP/YVF) operate without external cooling?
This depends on the speed range and load characteristics. In operations with low speeds and constant torque, fan speed drops, which reduces cooling. To prevent overheating, we equip these motors with independent external forced ventilation systems (IC416) or water-cooled jackets, maintaining safe operating temperatures across the entire speed range.
How does a permanent magnet synchronous motor (PMSM) compare to a standard induction motor?
PMSM motors use permanent magnets on the rotor instead of induced fields, eliminating rotor current losses. This allows them to achieve IE5 efficiency ratings, higher power density, and consistent torque output across a wide speed range, outperforming traditional induction designs in energy-intensive operations.
What parameters are simulated on Wolong's multi-physics structural and fluid platform?
We run simulations covering transient electromagnetic performance, rotor dynamics, convective thermal profiles, and acoustic output. By identifying mechanical stress points, cooling bottlenecks, and potential resonance issues digitally, we optimize motor frames before physical production begins.