An authoritative analysis of electrification, high-power drivetrains, and global industrial procurement trends.
Medium and high-voltage motors account for over 60% of all electrical energy consumed by heavy industries globally. Transitioning to IE4 and IE5 efficiency classes dramatically decreases Scope 2 emissions, ensuring regulatory compliance with strict carbon directives across Europe, North America, and Asian manufacturing hubs.
Underground coal mining, petrochemical synthesis, and gas pipelines run under volatile atmospheres. Equipment must feature robust explosion-proof ratings (ATEX/IECEx/EAC) to prevent internal electrical faults or thermal points from igniting external hazardous mixtures.
In continuous process operations, the Total Cost of Ownership (TCO) is heavily dominated by unplanned downtime. Deploying premium-grade mechanical casings, high-thermal margin insulation, and advanced cooling layouts mitigates electrical aging and premature motor degradation.
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 rapid expansion, Wolong has established 3 major manufacturing bases, operates 39 state-of-the-art factories, and manages 3 R&D centers worldwide. Wolong focuses exclusively on the design and manufacture of high-reliability electric motors and advanced electronic control systems, executing a global brand strategy that positions it at the leading edge of technology, research, production processes, and international market sales.
How Wolong integrated over 150 years of European and American motor engineering heritage to create a global R&D 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. In 2011, WOLONG company acquired strong technical and technological supports. WOLONG’s holdings 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. This positioned Wolong as a world-renowned, high-strength global motor manufacturer. ATB motor group included the brand Morley in the mining industry and Laurence Scott.
Both brands represent peak engineering. 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, synonymous with quality, power, and reliability. It provides the global market with high-specification, high-performance, high-quality electrical mine motor equipment. Laurence Scott, a pioneering company that supplied motors for British nuclear power plants, is renowned for manufacturing equipment with low starting currents and equipping 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 the WOLONG group, bringing over a century of expertise in electric motor design. Leading the way in energy-efficient motors, Brook Crompton developed a complete range of low, medium, and high voltage AC motors, including the premium Brook Crompton "W" and "10" series. They also provide adjustable speed drive packages for reliable systems. In parallel, Schorch electric motor joined WOLONG in 2011. Since 1882, Schorch has set the standard for high-quality motors, catering to global projects in oil and gas, chemicals, power generation, water supply, wastewater management, shipbuilding, steel processing, test stations, and tunnels.
Regarding vibration motors (MVE) and Ex vibration sensors, OLI Brand owns the largest market share globally. In 1999, WOLONG started a joint 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, officially joined the WOLONG Group. With various types of explosion-proof motors, low-voltage asynchronous motors, and Ex-proof high-voltage motors, Nanyang Explosion Group's products are widely deployed in oil, coal, chemical, metallurgy, electricity, military, and nuclear power fields.
In 2018, General Electric (GE) commercial and industrial motor division joined the ranks of WOLONG. As one of the oldest manufacturers of commercial and industrial electrical equipment, GE caters to major heavy industries, including oil and gas, petroleum and chemicals, power generation, mining, metal processing, paper, water treatment, cement, and materials processing. With deep experience in electric motor manufacturing, GE provides robust technology transfer and market support to WOLONG, making it a true global pioneer in motor innovation.
Exploring the multi-physics simulations, premium insulation, and metallurgy that define Wolong's reliability.
The stator coil is crafted from premium polyester film reinforced with glass cloth, using low-powder or medium-powdered mica tape with high mica content. Following the VPI (Vacuum Pressure Impregnation) process, a pristine white coil insulation structure is formed. After the billet is extracted, it undergoes VPI treatment to transform into a finished unit. The windings are engineered for electrical performance, mechanical strength, moisture resistance, and high thermal stability under Class F/H ratings.
The rotor features a rugged squirrel cage design, utilizing cast aluminum produced via centrifugal casting or high-pressure die-casting. This integrates the rotor bars and end rings, guaranteeing outstanding torque properties. For larger capacity and high-speed motors, copper bar rotors with copper alloy end rings are employed using reliable welding procedures. The protective ring design of high-speed motors ensures the long-term integrity of the copper bar rotor under heavy dynamic stress.
The motor frame is developed on a fully digital simulation platform using structural and fluid dynamics. Utilizing high-strength cast iron or structural steel, the frame features high structural redundancy, excellent heat dissipation, and natural frequency isolation margins. It is engineered to endure mechanical shocks, maintain low vibration levels, and reduce temperature rise in the motor core.
Comprising a fan cover body, air guide cylinder, protective window, and silencer plate, this system features a lightweight structure to minimize vibration. The side air inlet optimizes ventilation flow while reducing acoustic energy. Integrated sound-absorbing materials lower motor noise. The fan cover is rated IP22, preventing accidental contact while facilitating clean air circulation.
Analyzing the manufacturing scale and technological advantages of China's premier HV motor export pipeline.
Our manufacturing facilities in China leverage localized supply networks for critical raw materials, including high-grade cold-rolled silicon steel, high-purity oxygen-free copper wires, and specialized cast iron. This proximity minimizes raw material transport times and cost overheads, enabling rapid production turnaround.
From stator winding tension control to automated vacuum pressure impregnation (VPI) cycles and rotor balancing, the factories use manufacturing execution systems (MES). This end-to-end trace logging ensures consistency across production batches, meeting the standards expected by international oil, gas, and power generation companies.
Global market access secured through compliance with major international electrical, explosion-proof, and mining certificates.
Adhering to a comprehensive marketing strategy for electric motors across the entire industry chain, WOLONG has secured major product certifications to enter international markets:
- ISO Standard: WOLONG is an ISO 9001 certified Ex motor manufacturer. This standard is a critical gateway for surmounting trade barriers and entering global markets, serving as a prerequisite for production, business operations, and trade.
- NEMA Standard: To confirm that WOLONG's electric motors meet NEMA's mechanical and electrical performance specifications, we conduct thorough testing. This includes efficiency tests, insulation resistance testing, starting current and torque tests, durability testing, and vibration/noise assessments. For low-voltage motors, WOLONG has acquired UL (Underwriters Laboratories) and CSA (Canadian Standards Association) certificates.
- IECEx and ATEX Standard: For low & high-voltage motors, including explosion-proof types, WOLONG has acquired IECEx and ATEX certificates. This facilitates the export of compliant motor systems to European countries (EU).
- TESTSAFE Standard: Testsafe is the largest coal product certification body in the Southern Hemisphere. Acquiring Testsafe certification opens channels for Chinese coal mining motors to enter Australia and other global mining equipment markets, further enhancing the international reach of WOLONG's systems.
Nemko / ATEX
CSA
CE
CC (CCC)
SABS
TESTSAFE
With 39 manufacturing facilities and 4 R&D centers across China, Vietnam, the UK, Germany, Austria, Italy, Serbia, Mexico, and India, WOLONG motors serve global heavy industries.
Powering high-capacity pipeline compressors, raw crude water pumps, oil transport pumps, and chemical refinery ventilation fans. Flameproof casings and ATEX/IECEx ratings prevent ignition in volatile hydrocarbon atmospheres.
Providing heavy-duty, flameproof motors for armored face conveyors, continuous miners, roadheaders, and underground ventilation systems. Built to withstand impact, heavy dust, and moisture in mine workings.
Driving large recirculating water pumps, boiler feed pumps, coal pulverizers, forced draft fans, municipal water treatment systems, and high-volume desalination plants with long-term motor reliability.
Comparison data across key product series designed for industrial process automation and hazardous areas.
| Motor Series | Voltage Range | Efficiency Rating | Ex-Proof Classification | Typical Applications |
|---|---|---|---|---|
| YKK Series | 6kV, 10kV, 11kV | IE3 / IE4 | Safe Area / Increased Safety | Compressors, Pumps, Fan Systems |
| YB3 / YBX3 Series | 380V - 10kV | IE3 / IE4 Premium | Ex d IIC T4 Gb | Petrochemical Pumps, Refineries |
| YBSD Series | 1140V - 3.3kV | High efficiency industrial | Ex d I Mb / Coal Mine | Scraper Conveyors, Coal Cutters |
| TBVF Series | 380V - 6kV (VSD) | IE4 / IE5 Ultra-efficient | Ex d ib IIB T4 Gb | PMSM Variable Speed Mines |
| WEPM Series | 380V - 690V | IE5 super premium | Standard / Ex Optional | Variable speed pump packages |
How the next generation of high-voltage electric drivetrains integrates IoT diagnostics and ultra-high efficiency permanent magnet materials.
High-voltage PMSM systems are replacing induction motors in variable load applications. Using rare-earth permanent magnet rotors, these systems eliminate rotor copper losses, maintaining high efficiency even at partial loads. When combined with Variable Frequency Drives (VFDs), energy consumption drops by up to 30% compared to traditional constant-speed systems.
Modern industrial plants use smart vibration sensors, RTD stator temperature sensors, and partial discharge monitors directly on the motor frame. These transmit real-time telemetry to edge computers or cloud analytics platforms, alerting maintenance teams to bearing wear, insulation aging, or shaft misalignment before catastrophic failure occurs.
Answers to technical, regulatory, and procurement questions for project engineers and supply chain managers.
YKK series motors utilize air-to-air cooling (IC611) with a box-type construction, suitable for standard heavy-duty applications. YKS series motors feature water-to-air cooling (IC81W), offering superior cooling performance and a compact footprint in restricted spaces. YB3/YBX3 series motors are flameproof explosion-proof motors (Ex d) designed specifically for hazardous locations, with robust casings that contain internal explosions and prevent external gas ignition.
The VPI process places the wound stator under a deep vacuum to draw out air pockets and moisture from the mica insulation tape, then injects epoxy resin under high pressure. This results in a void-free insulation structure that improves dielectric strength, heat dissipation, structural rigidity, and resistance to environmental moisture and chemical contamination.
Motors deployed in hazardous zones must be certified to local and international explosion-proof standards. In Europe, ATEX directives are mandatory. Internationally, the IECEx scheme is widely accepted, while the EAC certification is required for the Eurasian Economic Union. In North America, motors must meet NEMA standards with UL/CSA listings for specific class, division, and group environments.
IE4 and IE5 Permanent Magnet Synchronous Motors (PMSMs) offer high efficiency, particularly under partial load conditions, and feature a higher power-to-weight ratio. They eliminate rotor losses and run cooler than induction motors, extending bearing and insulation life. In variable-speed applications, they deliver significant electricity savings, yielding a rapid return on investment (ROI).
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