Explore our leading industrial low-voltage & high-voltage three-phase asynchronous motors manufactured with global certifications.
Strategic analysis of the thermal dynamics, international market adoption, and efficiency paradigms of air-to-air cooling topology.
In modern industrial drive engineering, thermal management determines the operational lifespan, efficiency, and reliability of high-voltage (HV) electric motors. Among the standardized cooling systems designated by the International Electrotechnical Commission (IEC 60034-6), the IC611 cooling configuration stands as a foundation for heavy-duty industrial applications. An IC611 motor is equipped with an air-to-air heat exchanger (cooling tubes) mounted on the frame. The internal air circuit is driven by a shaft-mounted internal fan, circulating hot air inside the active components of the motor through the heat exchanger tubes. Simultaneously, a shaft-mounted external fan forces cool ambient air through these tubes, facilitating rapid thermal exchange without exposing the interior winding to dust, corrosive chemical gases, or moisture.
The global demand for IC611 cooling motors has experienced significant growth, propelled by the expansion of petrochemical processing, municipal wastewater treatment, heavy mining operations, and clean energy generation. Unlike open-loop cooled motors (such as IC01), IC611 motors provide an IP55 or higher ingress protection rating, isolating the stator windings from contaminants. While liquid-cooled motors (IC81W) offer higher thermal density, they require a constant water infrastructure, making them prone to scaling, corrosion, and leakage. IC611 motors present a self-contained, maintenance-free cooling alternative, highly favored in remote or harsh terrains.
Geographically, high-voltage air-to-air cooled motors are critical assets in the Middle Eastern oil and gas corridor, Siberian natural gas transport networks, Australian open-cut mining complexes, and rapidly growing East Asian manufacturing sectors. The transition toward high-efficiency benchmarks (IE3 and IE4 MEPS) has pushed design engineers to adopt advanced electromagnetic models and optimized fluid-dynamics simulations to reduce windage losses associated with the IC611 external and internal fan systems. By minimizing these losses, contemporary manufacturers deliver motors that maintain high thermal margins while achieving peak operating efficiencies.
Shaanxi Nanfang Motor Technology Co., Ltd & The Global Manufacturing Capabilities of Wolong Electric Drive Group
Shaanxi Nanfang Motor Technology Co., Ltd is the authorized distributor of Wolong. Wolong Electric Drive Group Co., Ltd was founded in 1984 and successfully listed in 2002 (code SH600580). After more than 30 years of development, Wolong has 3 manufacturing bases, 39 factories, and 3 R&D centers worldwide now. Wolong has always focused on the manufacture of motors and control systems, committed to a global brand strategy, making Wolong a leader in R&D, technology, process, manufacturing and sales in the global market.
This massive manufacturing infrastructure is backed by strategic acquisitions of the world’s most prestigious legacy motor brands, turning Wolong into a global power in advanced electrical rotating machines. These brands carry over a century of engineering wisdom and custom solutions, meeting the procurement needs of the world's most demanding enterprises.
How state-of-the-art Chinese motor factories deliver unmatched cost-to-performance ratios and strict quality compliance.
The manufacturing efficiency of Chinese factories specializing in high-voltage IC611 cooling motors represents a synthesis of highly integrated supply chains, advanced automation, and continuous technological upgrading. Leading facilities in China utilize digital twin modeling to simulate electromagnetic performance and fluid dynamics of air-to-air cooling manifolds prior to production. This integration reduces waste and ensures that structural frame castings, copper winding configurations, and heat exchanger assemblies are optimized for the specified frame sizes (from 355 to 630 and above).
Key efficiency drivers include:
A timeline of international strategic acquisitions bringing century-old engineering expertise under a single manufacturing powerhouse.
Accumulated with abundant asset and brilliant experiences in manufacturing, WOLONG started to reach for higher attempts. To be the leading manufacturer of AC motors & drives worldwide, WOLONG strove to acquire the oversea groups.
WOLONG’s holdings group successfully acquired 97.94% of the Austrian ATB Group (ATB motor), one of the three major European motor manufacturers, and became the actual controller of the ATB Group. ATB motor group included the brand Morley in the mining industry and Laurence Scott, both excellent in motor manufacturing.
Morley motor, with its nearly 130-year history, has been closely linked to underground coal mining. Currently, the Morley brand is highly esteemed in the global underground coal market and has become synonymous with quality, power, and reliability. It is a manufacturer that can provide the mine motor with high-specification, high-performance, high-quality electrical equipment for the global market.
Laurence Scott, the pioneering company that supplied motors for British nuclear power plants, is currently renowned for manufacturing equipment with low starting currents and also equips British naval vessels with generators. Following its acquisition by WOLONG, the company has been honored with the Queen's Award for three consecutive years.
Brook Crompton Motors joined WOLONG group as well. Brook motor stands as a venerable and profoundly skilled participant within the electric motor sector, boasting over a century of mastery in the technology and design of electric motors. Brook Crompton has developed a complete range of low voltage, medium voltage and high voltage AC motors, including the premium Brook Crompton “W”, “10” series and motors suitable for operation in hazardous and harsh environments.
Schorch electric motor joined WOLONG in 2011. Since its establishment in 1882, Schorch has set the standard for high-quality motors. The company offers a diverse range of driving systems to customers globally, catering to both domestic and international projects across oil and gas, chemicals, power generation, water supply, metal processing, and tunnels.
Regarding the vibration motor (MVE) and Ex vibration sensor, OLI Brand owns the largest market around the globe. Dating back to the year of 1999, WOLONG has jointly started the business with OLI vibration motor in China.
WOLONG Electric Nanyang explosion-proof group Co., Ltd. (CNE), China's largest explosion-proof motor scientific research and production bases, joined the WOLONG Group. Realized strategic cooperation in low/high voltage explosion-proof motors used in oil, coal, chemical, metallurgy, electricity, military, and nuclear power fields.
General Electric (GE) commercial and industrial electrical equipment divisions joined the ranks of WOLONG. Bringing abundant motor manufacturing heritage to support heavy industries including oil and gas, mining, metal processing, paper, water treatment, and cement globally.
An in-depth breakdown of the high-grade components powering the reliability of our rotating electrical machines.
The rotor features the squirrel cage design, with cast aluminum rotors being widely utilized. These rotors are produced using either centrifugal aluminum casting or die-casting techniques, where molten pure aluminum is poured into the slots of the rotor core, resulting in a single-piece construction that integrates the rotor bars and end rings. The structural integrity and manufacturing process of cast aluminum rotors guarantee the motor rotor's reliability, and also endow the motor with outstanding torque properties. For larger capacity motors, copper bar rotors are employed, which benefit from dependable bar securing and end ring welding procedures. Additionally, the protective ring design of high-speed motors further ensures the reliable operation of the copper bar rotor.
The coil is crafted from polyester film and reinforced with glass cloth, utilizing either low-powder mica tape with a high mica content or medium-powdered mica tape with an abundance of mica. Following the VPI (Vacuum Pressure Impregnation) process, a pristine white coil emerges from the production line. After the billet is extracted from the wire, it proceeds through the VPI process to transform into a finished unit. The winding and insulation are meticulously engineered to provide exceptional electrical performance, mechanical strength, resistance to moisture, and thermal stability.
The motor frame employs a fully digital platform for structural and fluid multi-physics field simulations. This simulation platform retains the original patent's structure and design, utilizing mature, high-strength cast iron (or steel as an alternative). The frame boasts exceptional structural redundancy, outstanding heat dissipation properties, and ample inherent frequency isolation margins for the entire machine. It is engineered to endure significant mechanical shocks, maintain a superior vibration level, and ensure a lower temperature increase in the motor.
The low-noise fan cover system comprises a fan cover body, an air guide cylinder, a protective window, and a silencer plate. Its compact structure and lightweight design facilitate vibration reduction. The air inlet is situated on the side, which optimizes the avoidance of obstacles behind the motor, minimizing adverse effects on ventilation and reducing noise caused by energy loss during propagation path changes. The system also incorporates sound-absorbing materials that absorb noise, thereby lowering the overall motor noise. Additionally, the fan cover is rated IP22, ensuring that hands cannot come into contact with the fan.
Ensuring absolute compliance with globally recognized electric motor and explosion-proof regulatory frameworks.
Adhere to the comprehensive marketing strategy for the electric motor and the entire industry chain: WOLONG has secured the majority of product certifications, enabling it to penetrate the international market.
Deployment of highly reliable drive systems across heavy industries, engineering machinery, and extreme environments.
As a globally esteemed manufacturer of motors and drive solutions, WOLONG boasts 39 manufacturing facilities and 4 research and development centers (R&D center) across various countries including China, Vietnam, the United Kingdom, Germany, Austria, Italy, Serbia, Mexico, India and so forth.
WOLONG's diverse range of motors finds application across a multitude of industrial sectors, serving equipment such as fans, water pumps, compressors, and engineering machinery. These motors are integral to various industries, including ventilation and refrigeration, construction, oil and gas, petrochemicals, coal chemistry, metallurgy, electric and nuclear power, maritime, and industrial automation, to name a few. WOLONG's mission is to deliver optimal solutions and services to our customers.
In oil & gas fields, for instance, IC611 cooling motors run continuous centrifugal pump networks where ambient dust or gas makes air-to-air cooling isolation critical. In steel mills and blast furnace projects, these motors power massive ventilation fans and air compressors, operating reliably under extreme thermal stresses. In municipal water pump stations, the low-vibration cast frames protect the motor from wear and tear, ensuring trouble-free water supply operations.
Understanding key parameters, variable frequency drive compatibility, and the future of smart motor diagnostics.
Global procurement teams in heavy industries face challenging requirements when specifying medium-voltage and high-voltage motor assets. Beyond the basic kW rating and frame size, engineers focus heavily on VFD (Variable Frequency Drive) compatibility, insulation systems, and condition monitoring accessories. The integration of IC611 cooling configuration motors with modern VFD drives demands insulated bearings (often on the non-drive end) to protect against circulating shaft currents. These currents, caused by common-mode voltages in VFD output waveforms, can otherwise cause bearing fluting and premature lubricant failure.
Key procurement checklist elements include:
Expert answers addressing common electrical engineering, cooling configuration, and installation inquiries.
Broad catalog of explosion-proof wound rotor, variable frequency, and high-efficiency low/high voltage induction machines.
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