High-reliability low & high-voltage AC electric motors compliant with international standards.
Shaanxi Nanfang Motor Technology Co., Ltd. is the authorized global distributor of Wolong Electric Drive Group Co., Ltd. (founded in 1984, listed on the Shanghai Stock Exchange in 2002 under code SH600580). Over nearly four decades, Wolong has solidified its position as a global leader in motor and drive control research, development, and manufacturing.
With an intensive global brand strategy, Wolong manages 3 premium manufacturing bases, 39 modern production facilities, and 3 world-class R&D centers across the globe. Our drive systems supply clean, efficient, and robust power to the world's most demanding environments, from mining and subsea petroleum exploration to heavy-duty industrial compression stations.
How Wolong brought together the world’s most trusted motor manufacturers under a unified banner of technological excellence.
Wolong successfully acquired 97.94% of the Austrian ATB Group, positioning itself as a top-tier European manufacturer. This integration absorbed iconic brands like Morley (boasting nearly 130 years of history in high-performance underground coal mining motor design) and Laurence Scott, renowned for specialized low starting-current systems and generators that power British nuclear plants and naval vessels.
Established in 1882, Schorch joined Wolong in 2011. A standard-setter for customized heavy industrial driving systems, Schorch drives excel in petro-chemical plants, waste-water management facilities, marine operations, and transport tunnel ventilation across Europe and the Middle East.
Wolong integrated CNE (China's leading explosion-proof scientific research and production center). This enhanced our technological capability to manufacture explosion-proof motors (including low and high voltage) used extensively in chemical, metallurgical, and defense infrastructure.
Wolong acquired GE's Commercial & Industrial Motors division. Bringing GE’s heritage of over a century in heavy industrial motor innovation, this division solidified Wolong's presence in the Americas across water treatment, cement processing, and pipeline compressor drives.
By bringing Brook Crompton Motors (celebrated for premium "W" and "10" series energy-efficient drives) and OLI Brand (the world’s largest producer of high-frequency vibration motors and sensors) into the ecosystem, Wolong now offers the most complete power transmission portfolio globally.
An in-depth analysis of motor selection, thermal management, and design criteria for compressed air applications.
Air compressors represent one of the most mechanically demanding duties for electric motors. Unlike constant-torque applications, rotary screw, centrifugal, and reciprocating air compressors experience fluctuating load conditions, frequent start-stops, and high starting-torque requirements.
To withstand these stresses, a compressor motor must provide high breakdown torque, exceptional thermal reserve (typically Class H insulation with Class B temperature rise), and a robust rotor construction that prevents fatigue failures during high-inertia start sequences.
Modern compressor systems rely heavily on Variable Speed Drives (VSD) to align air production with actual demand, saving up to 35% in energy costs. However, VFD operation introduces issues like voltage spikes and common-mode bearing currents. Wolong motors feature optimized slot designs, insulated non-drive end bearings, and premium grounding brushes (e.g., AEGIS rings) to guarantee long-term operation under variable frequencies.
Exploring the mechanical, electrical, and thermal components engineered to achieve maximum reliability.
Featuring a robust squirrel-cage design. Cast aluminum rotors are produced via advanced centrifugal or die-casting techniques, ensuring a single-piece construction that integrates rotor bars and end rings. For larger capacity systems, copper bar rotors with reliable end-ring welding provide optimal slip-reduction and elevated start torque.
Coils are crafted from high-performance polyester film reinforced with glass cloth and high-mica-content tape. Through the VPI (Vacuum Pressure Impregnation) process, the stator develops excellent dielectric strength, high thermal stability, moisture resistance, and mechanical defense against vibrations.
Developed on a digital structural simulation platform, the high-strength cast iron (or alternative welded steel) frame offers structural redundancy. It provides heat dissipation surfaces, isolates internal mechanical vibrations, and withstands shocks in high-pressure compressor duties.
This compact system features an air guide cylinder, protective window, and acoustic silencer plate. Side-located air inlets optimize flow around rear obstacles. Rated at IP22, the design reduces aerodynamic turbulence and operational sound pressure levels.
Ensuring cross-border compliance and trouble-free integration into international facilities.
For high-hazard environments (like oil refineries, chemical plants, and underground mines), compliance with local safety standards is non-negotiable. Wolong manufactures motors certified by international bodies to ease regulatory approval for compressor OEMs worldwide.
Our facilities are fully certified under ISO 9001 quality management systems. For North American markets, our NEMA standard low-voltage motors comply with UL and CSA guidelines, undergoing starting torque, starting current, and noise verification. For European markets, all motors comply with IEC standards, featuring CE markings and IE3/IE4/IE5 energy efficiency ratings.
Our explosion-proof and flameproof models carry ATEX and IECEx certifications. Additionally, our acquisition of the TESTSAFE certification (Australia's premier coal product safety body) provides access for mining-specific compressor drives into Oceania.
Nemko / ATEX
CSA Approval
CE Compliance
SABS Quality
As global industries transition toward net-zero emissions, the demand for high-efficiency compressor systems is reshaping motor design. Our engineering team, across centers in China, Europe, and Japan, focuses on three pillars:
Replacing standard induction motors with high-torque Permanent Magnet Synchronous Motors (PMSM). These systems offer IE5 efficiency and maintain their efficiency profile even during part-load operations, which is standard for variable-demand industrial air compressors.
Integrating vibration, temperature, and current sensors directly into the motor frame. Connected to cloud analytics platforms, these sensors enable predictive maintenance schedules, avoiding unplanned shutdowns in critical production lines.
Employing computational fluid dynamics (CFD) modeling to redesign stator cooling jackets. Better heat dissipation yields lighter motor casings and extends bearing grease life, reducing routine maintenance cycles.
Procuring heavy industrial motors requires balancing performance specifications with supply chain logistics. At Shaanxi Nanfang Motor Technology Co., Ltd, we support procurement teams with a comprehensive framework:
We analyze local power networks, ambient temperature patterns, altitudes, and hazardous gas exposures to customize motor specifications (e.g., winding design, bearing selection, and spatial heating systems for anti-condensation).
With 39 manufacturing plants worldwide, we can coordinate production across multiple sites to optimize shipping, minimize duties, and accelerate delivery schedules.
We provide field engineers to support initial installation, alignment checks, and test runs, ensuring your compressor starts up within warranty parameters.
Through our distribution network, we supply OEM-original stators, rotors, bearings, and explosion-proof terminal boxes to keep your operations running continuously.
Advanced drive motors designed for variable speed control, flameproof operation, and extreme temperature conditions.
Technical answers to help engineers, procurement teams, and system designers select the right motor.
Air compressors, especially reciprocating and loaded rotary screw types, often start against backpressure in the discharge lines. This requires the motor to generate high starting torque (NEMA Design C or Design D specifications) to overcome initial resistance without stalling or overheating the windings.
VFDs align the motor's operating speed with actual compressed air demands. By avoiding full-speed idling cycles, VSD compressors can reduce system energy consumption by up to 35%, lower starting current demands (preventing voltage drops in your facility), and reduce mechanical stress on the compressor screws.
Using Class H insulating materials (capable of withstanding up to 180°C) while designing the motor to run at a Class B temperature rise (80°C limit) creates a thermal safety margin of 45°C. This thermal buffer protects the motor against unexpected overloads, high ambient temperatures, and voltage harmonics caused by VFDs.
VPI (Vacuum Pressure Impregnation) places the wound stator in a vacuum tank to draw out moisture and air pockets before injecting resin under high pressure. Once cured, the windings form a solid structure with high resistance to moisture, particulate contamination, and electrical breakdown.
Depending on the location, motors must carry certifications like ATEX (Europe), IECEx (Global), CSA/UL (North America), or EAC (Eurasian Customs Union). These verify that the motor's explosion-proof (Ex d) or increased safety (Ex e) housing prevents internal sparks from igniting external hazardous gases or dust.
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