In modern industrial applications, thermal control is paramount. Three-phase cooler motors act as the heart of ventilation units, industrial heat exchangers, cooling towers, and heavy condenser systems. Unlike single-phase alternatives, 3-phase cooling motors provide high constant torque, exceptional electrical balance, and structural reliability. As manufacturing complexes face mounting thermal challenges from high-density computation, chemical processing, and metallurgical operations, the demand for robust, continuous-duty cooler motors has reached unprecedented levels.
Global regulatory bodies, including the European Commission (ErP Directive) and the US Department of Energy (DOE), are enforcing stringent Minimum Energy Performance Standards (MEPS). This transition has pushed industrial operators to migrate from standard motors to IE3, IE4, and IE5 super premium efficiency levels. High-efficiency 3-phase motors minimize thermal emissions inside the motor itself, leading to longer winding insulation lifespans, lower energy bills, and reduced operational carbon footprints.
Shaanxi Nanfang Motor Technology Co., Ltd. is the official authorized distributor of Wolong Electric Drive Group Co., Ltd. (founded in 1984, listed on the Shanghai Stock Exchange in 2002, code SH600580). Over the past three decades, Wolong has grown into a dominant power in global industrial machinery, building an unparalleled footprint of 3 main manufacturing bases, 39 manufacturing factories, and 3 global R&D centers.
By prioritizing state-of-the-art research and development, strict quality standards, and an aggressive global brand integration strategy, Wolong delivers highly tailored solutions for oil, gas, chemical processing, coal mining, metallurgy, and water treatment industries worldwide.
Chinese manufacturing facilities have evolved from manual assembly lines to fully integrated, intelligent smart factories. Utilizing robotic winding, computerized CNC metal stamping, automated Vacuum Pressure Impregnation (VPI), and dynamic balancing systems, we guarantee high dimensional consistency and zero assembly errors for every motor.
Our plants are located within dense industrial clusters. We procure premium electromagnetic copper wire, high-permeability cold-rolled silicon steel sheets, and heavy-duty structural cast iron housing directly from localized partners. This high concentration minimizes lead times and shields customers from international supply disruptions.
Every motor batch undergoes thorough physical tests, including stator core insulation resistance testing, winding surge test, high-potential dielectric test, vibration profile analysis, and load-temperature rise verification. This rigorous approach ensures full compliance with international standards before shipment.
Different kinds of Ex certificates for your industry and market, ensuring absolute safety in explosive, dusty, and hazardous industrial zones.
IE5/IE4/IE3 efficiency levels are available, alongside advanced Permanent Magnet Synchronous Motors (PMSM) for maximum energy savings.
Rich product line covering low, medium, and high voltage three-phase motors to meet the demanding requirements of various process industries.
Wolong has established motor and drive control R&D centers in China, Europe, and Japan, and established a central research institute in Shanghai. It is committed to the research of leading technologies in the field of motor and control technology. Some products have reached the international leading level.
Wolong owns leading domestic brands such as Nanyang Explosion, as well as internationally renowned century-old brands, such as Brook Crompton, Morley, Laurence Scott, Schorch, ATB, etc., and has a high brand reputation in the fields of oil and gas, petrochemicals, mining, etc.
As a well-known motor manufacturer, Wolong has significant advantages in explosion-proof performance, reliability, durability, etc., and are widely used in dangerous environments such as petroleum, chemical industry, coal mines, etc., and have passed the explosion-proof certification of national authoritative agencies and international fields: ATEX, IECEx, CU-TR, etc.
Accumulated with abundant assets 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. In 2011, WOLONG company acquired strong technical and technological support. WOLONG's holding group successfully acquired 97.94% of the Austrian ATB Group (ATB motor), one of the three major European motor manufacturers, becoming the actual controller of the ATB Group, and has become a world-renowned and high-strength global motor manufacturer. ATB motor group included the brand Morley in the mining industry and Laurence Scott.
Both are excellent in the 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. With its extensive background in technological innovation and design, Brook Crompton Motors leads the way in motor technology advancements and pioneers in the creation of energy-efficient motors. Driven by technology and innovation, Brook Crompton Motor 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. Brook Crompton also provides user-friendly adjustable speed drive packages to provide users with efficient and reliable drive systems.
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. Schorch collaborates with its strongest partners to provide services across various industries, including oil and gas, chemicals, power generation, water supply and wastewater management, shipbuilding, steel and metal processing, test stations, tunnels, and so forth.
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.
In 2015, WOLONG Electric Nanyang Explosion-proof Group Co., Ltd. (CNE), China's largest explosion-proof motor scientific research and production base, joined the WOLONG Group and successfully realized strategic cooperation. With various types of explosion-proof motors, low voltage asynchronous motors, Ex-proof high voltage motors, Nanyang Explosion Group's motors are mainly used in oil, coal, chemical, metallurgy, electricity, military, nuclear power, and other fields.
In 2018, General Electric (GE) industrial motors joined the ranks of WOLONG. As the oldest manufacturer of commercial and industrial electrical equipment, GE caters to a multitude of heavy industries, encompassing oil and gas, petroleum and chemicals, power generation, mining and metal processing, paper, water treatment, cement, and materials processing. With abundant experience in electric motor manufacturing, GE provides huge support to WOLONG.
"WOLONG, originating in the city of Shangyu and burgeoning in China, is now rising as a global pioneer in the advanced cultivation and innovation of electric motor manufacturing!"
Adhering to a comprehensive marketing strategy for electric motors across the entire industry chain, WOLONG has secured major global certifications, breaking international trade barriers and ensuring safety compliance.
Nemko / ATEX
CSA
CE
CC / CCC
SABS
TESTSAFE
WOLONG is an ISO 9001-certified Ex motor manufacturer. This certification underpins our entire production and quality management. To meet NEMA's mechanical and electrical standards, we carry out comprehensive performance audits, covering efficiency testing, starting current/torque limits, vibration analysis, and temperature rise curves. For NEMA applications, WOLONG motors hold UL and CSA certificates.
For hazardous environments, our low and high-voltage motors hold IECEx and ATEX certifications, allowing direct integration in European industrial zones. Additionally, we hold the Australian TESTSAFE certification (the largest coal industry certification body in the Southern Hemisphere), opening direct supply pathways for mine-duty and explosion-proof motors into Australia.
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.
In modern HVAC and cooler tower units, energy load varies with ambient temperatures. Our 3-phase cooler motors are optimized for VFD (Variable Frequency Drive) operation. By adjusting motor rotation speed dynamically according to the actual cooling load, plants save up to 40% of their thermal management energy consumption, while lowering system start-up currents.
For installations in the Middle East or marine offshore environments, motors are tropicalized. We utilize special anti-corrosion marine epoxy coatings, IP56/IP66 mechanical sealing structures, and space heaters to prevent moisture condensation during cold stand-by cycles, ensuring failure-free operations under ambient conditions of up to 60°C.
Smart factory systems demand real-time diagnostics. Integrating Ex vibration sensors (such as OLI sensor interfaces) and RTD winding/bearing temperature sensors directly into the cooler motor allows central control panels to flag potential bearing wear or phase imbalances before they escalate into costly shutdowns.
As a globally esteemed manufacturer of motors and drive solutions, WOLONG boasts 39 manufacturing facilities and 4 research and development centers (R&D centers) 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.
Procurement departments in major engineering companies (EPCs) evaluate industrial motor suppliers on several criteria beyond cost. A reliable partner must align with international standards to ensure low Total Cost of Ownership (TCO).
| Procurement Criterion | Technical Expectation | Wolong / Nanfang Compliance Value |
|---|---|---|
| Certificates & Approvals | ATEX, IECEx, UL, CSA, EAC, SABS | Fully certified and tested with documents validated by third parties. |
| Efficiency Class | IE3 Premium, IE4/IE5 Super Premium | Meets and exceeds EU eco-design requirements, reducing power losses. |
| Customization Level | Shaft modifications, voltage variations, sensor integration | Full OEM/ODM design engineering utilizing 3 global R&D centers. |
| Enclosure Protection | IP55, IP56, IP65, IP66 | Fully sealed, weatherproof designs for heavy outdoor installations. |
| Warranty & Service Life | Class F/H Insulation, high bearing load ratings | Long-life design, minimal wear profile, global service network. |
A1: Three-phase cooler motors offer superior power density, self-starting capabilities, and consistent torque. They run with significantly less vibration, reducing mechanical wear on the fan blades and bearings. Furthermore, 3-phase designs draw a balanced current profile, reducing total heat generation inside the control cabinet and allowing for more efficient electrical cabling layout in large factories.
A2: The VPI process removes all air pockets, moisture, and voids from the stator slot windings. Liquid resin penetrates deep into the glass cloth and mica tapes under vacuum, followed by high-pressure curing. This turns the entire winding into a solid block, yielding excellent thermal conductivity, resistance to chemical attack, structural integrity against mechanical vibrations, and high dielectric strength.
A3: Our explosion-proof (Ex d, Ex e) motor lines, including the YB3, YB4, and YBSS series, are built with heavy flameproof cast iron enclosures. Should an internal short-circuit trigger a spark, the robust housing contains the thermal ignition and cools escaping gases through long, narrow flamepath joints. This prevents any ignition of explosive ambient gases, coal dust, or chemical vapors.
A4: Yes. Specialized low-voltage and high-voltage motors like the YBBP, WEBP3, and WEPM series are designed specifically for VFD operation. They utilize reinforced winding insulation to withstand high voltage peaks (dv/dt) generated by modern drive switchboards, and can be fitted with insulated bearings to prevent stray shaft currents from causing electrical pitting.
A5: European markets require CE markings alongside ATEX certification for explosive atmospheres. For Australia, our motors comply with relevant AS/NZS standards, supported by the TESTSAFE certification pathway. This allows procurement departments to clear regulatory requirements smoothly.
A6: Cast aluminum rotors are standard for low to medium-power applications due to their lightness, ease of casting, and balanced torque properties. For high-voltage, large-capacity motors, copper bar rotors are preferred because copper has lower electrical resistance, minimizing rotor thermal losses and maximizing startup efficiency in heavy fan and compressor loads.
NANFANG
