Medium Voltage (MV) induction motors represent the prime movers of global heavy industry. From petrochemical centrifugal compressors to long-distance mine conveyors and thermal power plant water pumps, these machines operate in the critical voltage window of 1kV to 15kV, bridging the gap between low-voltage distribution limits and high-voltage transmission lines. Modern manufacturing emphasizes optimized power-to-weight ratios, reduced starting currents, and superior insulation endurance under harsh thermal cycle stresses.
As heavy industry shifts toward energy decarbonization, the demand for high-efficiency MV drives has surged. The total lifecycle cost of an induction motor is heavily dominated by operational energy costs—often representing over 95% of the total cost of ownership. Consequently, the adoption of IE4 and IE5 super premium efficiency classes is no longer optional but a regulatory and financial imperative for global plant operators.
Shaanxi Nanfang Motor Technology Co., Ltd. stands as the authorized channel and strategic delivery arm of Wolong Electric Drive Group Co., Ltd. Founded in 1984 and listed on the Shanghai Stock Exchange (SH600580) in 2002, Wolong has grown to become the world’s leading motor manufacturer. Wolong operates a massive industrial footprint with 3 global manufacturing bases, 39 manufacturing plants, and 3 state-of-the-art R&D centers globally.
Wolong's global reach is reinforced by the acquisition of prestigious, century-old motor brands. By integrating ATB, Brook Crompton, Morley, Laurence Scott, Schorch, OLI, CNE (Nanyang Explosion-Proof), and the commercial industrial motor division of General Electric (GE), Wolong has built an unparalleled technology suite, covering standard industrial configurations as well as complex marine, nuclear, and flameproof applications.
Acquired in 2011, ATB is one of Europe's top three motor manufacturers. This group includes Morley, boasting over 130 years of history in underground coal mining. Morley is synonymous with quality, power, and reliability in hazardous mining environments.
Laurence Scott is legendary for low starting current designs used in British nuclear plants and naval vessels. Brook Crompton is a pioneer in motor energy efficiency, offering premium "W" series low, medium, and high-voltage motors for challenging operating conditions.
Established in Germany in 1882, Schorch sets the standard for high-power drive systems. CNE (Nanyang Explosion-Proof Group) joined in 2015 as China's largest research and production base for explosion-proof motors, supporting petrochemical, nuclear, and aerospace sectors.
Our stator coils utilize polyester film combined with glass cloth and high-mica content tape. Following assembly, the wound stator undergoes a full Vacuum Pressure Impregnation (VPI) cycle, creating a moisture-resistant, mechanically rigid winding block. This process minimizes partial discharge risks, ensuring reliable performance in harsh medium-voltage applications.
For standard high-torque demands, squirrel cage rotors are produced using centrifugal aluminum casting or die-casting techniques. For larger capacities or high-vibration applications, copper bar rotors are utilized. These feature custom copper bars welded to heavy-duty end rings, ensuring long-term thermal stability and mechanical integrity.
Constructed using high-strength cast iron or structural steel, our motor frames are engineered using finite element analysis (FEA) and computational fluid dynamics (CFD) simulation. This design process ensures structural rigidity and high thermal dissipation, effectively isolating mechanical vibrations and reducing thermal gradients across the core.
Featuring a compact aerodynamic design with a fan cover body, air guide cylinder, protective window, and silencer plate, this system optimizes cooling performance while minimizing noise. Sound-absorbing lining materials damp aerodynamically generated noise, and the IP22 protection rating prevents accidental physical contact.
We offer flameproof (Ex d), positive pressure (Ex p), and non-sparking (Ex ec) motors tailored for offshore drilling, refineries, chemical storage, and dusty underground mine shafts.
By optimizing winding fills, rotor laminations, and airgap tolerances, our motors meet international IE3, IE4, and IE5 energy efficiency standards, reducing both emissions and operating costs.
We supply custom drives for heavy equipment, including high-torque tunnel boring machines, continuous mine conveyors, pipeline compressors, and large-scale industrial water pumps.
To support project requirements in all global markets, our motors and drives hold complete international approvals, ensuring hassle-free integration, local code compliance, and safety.
Our commitment to global standards covers several key industrial frameworks:
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