High voltage explosion-proof motors play a key role in ensuring safety, reliability, and operating efficiency in hazardous industrial environments. Across chemical facilities, offshore oil and gas production platforms, pipeline transportation corridors, and deep underground mines, explosive gases and volatile dust configurations are a constant presence. System drives in these environments must operate reliably while ensuring they do not act as ignition sources under thermal or electrical fault conditions.
With global safety regulations harmonizing under strict ATEX and IECEx standards, modern engineering requirements are shifting from basic mechanical isolation to smart, highly integrated safety systems. Today's industrial developers demand motors that offer robust explosion protection alongside high operational efficiency (conforming to IE4 and IE5 guidelines) to minimize energy waste and carbon emissions. High-quality Ex-proof high voltage motors help bridge the gap between strict regulatory safety compliance and low total cost of ownership (TCO).
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.
Fully compliant with international safety directories. We supply different kinds of Ex certificates for your specific industry and market demands, facilitating hassle-free local regulatory approvals.
Our technology makes IE5/IE4/IE3 efficiency configurations available across frames. We also specialize in custom permanent magnet type layouts to optimize operating efficiency under variable load profiles.
A broad product line covering motors that meet the needs of different industries and hazardous areas, from small auxiliary pumps to large industrial cooling tower fan installations.
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 domestic motor manufacturer, Wolong has significant advantages in explosion-proof performance, reliability, durability, etc., and is widely used in dangerous environments such as petroleum, chemical industry, coal mines, etc., and has passed the explosion-proof certification of national authoritative agencies and international fields: ATEX, IECEx, CU-TR, etc.
In 2011, WOLONG acquired 97.94% of the Austrian ATB Group, one of the three major European motor manufacturers, becoming the actual controller of ATB. This strategic move brought invaluable technical support, establishing Wolong as a premier global motor manufacturer.
With a history spanning nearly 130 years, Morley is closely linked to underground coal mining. Renowned globally for power and reliability, Morley mine motors provide high-specification, high-performance, and high-quality electrical drive solutions.
A pioneer in supplying low-starting-current motors for nuclear power stations and marine generators for naval vessels. Laurence Scott's technology has been recognized with the Queen's Award for three consecutive years.
A key motor designer boasting over a century of technical excellence. Brook Crompton is a pioneer in high-efficiency design. Its portfolio includes the "W" and "10" series, as well as motors engineered for hazardous and harsh industrial sites.
Founded in 1882, Schorch sets high-quality standards in large heavy-duty motor systems. They supply high-spec drive packages for global projects in oil & gas, chemical processing, power generation, and steel plants.
Dating back to 1999, Wolong's partnership with OLI has established a globally recognized portfolio for vibration motors (MVE) and Ex-proof vibration sensors, serving bulk material handling applications.
In 2015, China's largest explosion-proof motor R&D and production base joined Wolong. CNE specializes in low-voltage and high-voltage Ex motors utilized across mining, petroleum, metallurgy, and nuclear installations.
In 2018, GE's commercial and industrial motor division partnered with Wolong. This integration combined GE's long-standing manufacturing heritage with Wolong's global production footprint to serve heavy industry.
Squirrel Cage Cast Aluminum and Copper Bar Designs: The rotor features a squirrel cage design, with cast aluminum rotors being widely utilized. These rotors are produced using 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.
Vacuum Pressure Impregnation (VPI) Treatment: 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.
Multiphysics Simulation and Structural Optimization: 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.
Integrated Aerodynamic Silencing: 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.
Future high-voltage Ex-proof motors will integrate smart, non-invasive vibration, thermal, and acoustic sensors. Real-time diagnostic data is analyzed at the edge to predict bearing failures and coil breakdown before unscheduled downtime occurs.
By incorporating advanced permanent magnet technologies and high-grade silicon steel laminations, our product development roadmap is shifting toward standardizing Ex-proof motors with IE5 efficiency ratings, significantly reducing system energy consumption.
Deploying advanced nanocomposite mica materials and refined VPI processes yields higher thermal margins. This ensures reliable operation under temporary overload cycles and in high-temperature ambient conditions without insulation degradation.
Our centralized production plants in China leverage vertically integrated supply chains. From raw copper casting and precise silicon steel slitting to automatic wire winding and high-pressure insulation treatment, every step is performed under one roof. This minimizes transportation delays and ensures consistent component quality.
This localized manufacturing base provides robust supply chain resilience against global logistical disruptions. Supported by a comprehensive vendor ecosystem and optimized component inventory, Shaanxi Nanfang Motor Technology Co., Ltd. can offer reliable lead times for highly customized high voltage motor orders. This setup ensures prompt delivery schedules for international projects.
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.
Our localized support model combines Shaanxi Nanfang Motor Technology Co., Ltd.'s prompt customer response with Wolong's global factory network (Vietnam, Germany, United Kingdom, Austria, Mexico, India, Serbia, etc.). This ensures that regardless of your installation site location, local technicians are available to manage mechanical commissioning, certification alignment, and on-site maintenance.
We provide localized technical assistance, engineering reviews, motor performance analysis, and support for hazardous area certification audits. This localized service model minimizes system downtime, optimizes spare parts availability, and ensures your drive assets comply with regional safety frameworks and operating directives.
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.
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