Engineered and Distributed by Shaanxi Nanfang Motor Technology Co., Ltd. - High Performance & Dynamic Operations
Navigating the Shift to High-Efficiency, Decarbonized, and Customized Drive Technology
In modern process plants, standard IEC and NEMA induction motors frequently encounter limits in performance, physical spacing, and harsh environment endurance. The sector of "Other Series Motors" addresses these limits by covering non-standard, custom-engineered, and specialized industrial drives. These include high-voltage positive pressure designs (such as the YZYKS series), increased-safety brushless synchronous units (TAW series), and customized wound rotor induction systems (YR, YRKS, YRKK). As industrial processes transition to higher power densities and variable frequency regulations, specialized motors provide the custom engineering needed for safety and uptime in mining, oil and gas, and chemical operations.
Driven by strict environmental and safety regulations such as Europe's ATEX directives and global IECEx standards, global heavy industries are replacing aging, inefficient drive packages. Modern process installations now require integrated variable frequency speed regulation systems and energy-saving designs that comply with IE3, IE4, and IE5 thresholds. Customized drive solutions help operators lower operational expenses (OPEX) while maintaining thermal safety and mechanical reliability in explosive or highly corrosive environments.
High-voltage motors (typically operating from 3kV to 11kV) run at lower currents than low-voltage alternatives. This reduced current allows for smaller supply cables, simpler switchgear, and lower overall system power losses. However, running at high voltages demands advanced insulation materials, precise thermal cooling system designs, and strict mechanical tolerance control to prevent electrical tracking and partial discharge.
Additionally, application scenarios like coal shearers, deep-sea exploration outboards, and large-scale industrial centrifugal fans require custom torque curves and unique frame geometries. For example, wound rotor motors (YR/YRKK) deliver high starting torque with low starting currents, making them ideal for heavy conveyors and grinders. Meanwhile, distributed synchronous condensers provide critical reactive power support to stabilize local power grids. Partnering with a manufacturer that possesses deep simulation capabilities and global certification pathways ensures customized motors integrate cleanly into existing plants without costly mechanical modifications.
Industrial motors do not operate in isolation; they function within complex process systems. Shaanxi Nanfang Motor Technology Co., Ltd. supplies motors designed using integrated multi-physics platforms. These platforms evaluate electromagnetic performance, thermal dynamics, structural resonance, and fluid cooling paths simultaneously. This design approach prevents local hotspot formation, isolates motor natural frequencies from external piping vibration, and ensures reliable operation over extended life cycles.
Authorised Distributor of Wolong Electric Drive Group Co., Ltd.
Shaanxi Nanfang Motor Technology Co., Ltd. is the authorized distributor of Wolong, a global motor manufacturing brand. Founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (code SH600580), Wolong Electric Drive Group Co., Ltd. has developed over three decades into a leading motor drive supplier. The company operates 3 global manufacturing bases, 39 individual production factories, and 3 global R&D centers, providing advanced technology, manufacturing scale, and distribution support to global markets.
Through strategic acquisitions, Wolong has integrated several established motor manufacturers into its portfolio. This includes the Austrian ATB Group (acquired in 2011, which includes mining specialist Morley and Laurence Scott), UK-based Brook Crompton, Germany's Schorch, vibration motor manufacturer OLI, China's CNE (Nanyang Explosion-Proof Group), and cooperation with General Electric (GE) industrial motor business. This unified network combines century-long design traditions with modern manufacturing efficiency to deliver reliable motor solutions worldwide.
By acquiring and partnering with leading global motor brands, Wolong offers a broad range of industrial motor technologies:
How Shaanxi Nanfang Motor Tech Combines Global Engineering with China's Advanced Supply Chain
We offer full certification compliance for hazardous environments. From Ex d (flameproof) to Ex e (increased safety) and Ex p (pressurized), our motors meet global regulatory requirements for petrochemicals, mining, and oil platforms.
We support global carbon reduction goals by supplying motors in IE3, IE4, and ultra-premium IE5 efficiency classes. We also provide permanent magnet synchronous motor (PMSM) systems to optimize energy consumption under variable load profiles.
Our catalog covers low, medium, and high-voltage AC motors alongside distributed synchronous condensers, variable frequency speed regulation systems, and coal shearer motors, allowing for unified plant procurement.
Producing motors in Wolong's domestic facilities delivers significant cost and lead-time advantages. By using automated stator winding, advanced VPI insulation lines, and local raw material suppliers, we lower production costs. Additionally, our testing facilities can run full-load tests up to 10MW, ensuring that all motors meet operational standards before shipping, reducing on-site startup delays.
Material Quality and Structural Engineering Behind Our Industrial Motors
We use squirrel cage designs with cast aluminum rotors for standard applications. These rotors are manufactured using centrifugal casting or high-pressure die-casting, which pours pure aluminum into the rotor core slots. This process forms integrated rotor bars and end rings, providing reliable starting torque characteristics. For larger high-voltage motors, we use copper bar rotors with welded end rings to handle high mechanical stress and thermal expansion. High-speed models also incorporate alloy retaining rings to prevent rotor bar deformation under centrifugal force.
Our stator windings use high-grade polyester film insulated copper wires wrapped with glass cloth and high-mica content tape. After winding, the stator core undergoes a vacuum pressure impregnation (VPI) process using solvent-free resin. The resin cures into a solid, void-free insulation structure that provides mechanical strength, moisture resistance, and high thermal conductivity (Class F or Class H insulation). This process prevents insulation breakdown from moisture and chemical attack in harsh environments.
Our motor frames are designed using multi-physics structural and fluid dynamic simulations. Made from high-strength grey cast iron or welded structural steel, the frames provide structural rigidity to resist mechanical shocks. The cooling fin geometry is optimized to improve airflow and heat dissipation, maintaining a low internal temperature rise. Rigid frame feet also prevent mechanical resonance under variable frequency operation, extending bearing life.
The cooling system consists of an aerodynamic fan cover, air guide cylinder, protection grille, and integrated silencer plates. The side-entry air inlet reduces backpressure and noise caused by air turbulence. Integrated acoustic dampening materials absorb high-frequency fan noise to help meet workplace safety standards. The fan assembly meets IP22 protection standards, preventing accidental contact with rotating parts while maintaining high cooling airflow.
Comparison of Core Parameters Across Major Special Industrial Motor Series
| Motor Series | Voltage Range | Ex-Proof Protection Type | Efficiency Class | Cooling Method | Key Application Areas |
|---|---|---|---|---|---|
| YKK Series | 3 kV - 11 kV | Non-hazardous / Safe Area | IE3 / IE4 | IC611 (Air-to-Air Cool) | Pumps, Fans, Compressors, Conveyors |
| YZYKS Series | 6 kV - 11 kV | Ex pxb / Ex pyb (Positive Pressure) | IE3 / IE4 | IC81W (Air-to-Water Cool) | Petrochemical Refineries, Gas Processing |
| TAW Series | 3 kV - 10 kV | Ex eb (Increased Safety) / Brushless Synch | IE4 / IE5 Class | IC611 / IC81W | Large Hydrogen Compressors, Oxygen Plants |
| YB3 / YBX5 | 380V - 1140V (LV) | Ex db IIC T4 Gb (Flameproof) | IE3 (YB3) / IE5 (YBX5) | IC411 (Self-Ventilated) | Chemical Stills, Oil Pumps, Drilling Rigs |
| YR / YRKK | 6 kV - 10 kV | Slip-Ring / Wound Rotor | IE3 Standard | IC611 / IC01 | Ball Mills, Mine Hoists, Heavy Crushers |
| WEX3 Series | 220V - 690V | Ex db eb IIC T4 Gb | IE3 / IE4 (Brook Crompton Design) | IC411 | Offshore Platforms, Grain Silos, Paint Mills |
Approved for Compliance Across European, American, Asian, and African Markets
Nemko / ATEX
CSA
CE
CCC
SABS
TESTSAFE
Wolong manufacturing bases are ISO 9001 certified, ensuring traceable quality management from raw material inspection through rotor balancing and final VPI curing. For markets in North America, our low-voltage and medium-voltage motor lines are designed and tested to meet NEMA mechanical performance and mounting standards, holding UL and CSA certificates to verify starting torque and insulation ratings.
For chemical and mining environments, Wolong motors comply with IECEx and European ATEX directives. This compliance allows for deployment in Zone 1 and Zone 2 gas hazardous areas, and Zone 21 and Zone 22 dust environments. Our product certifications also include the Australian TESTSAFE standard, which permits our coal mining motors to operate in Australian underground mining projects.
Touring Our Industrial Manufacturing Bases, Quality Testing, and Materials Storage
Wolong's growth includes the acquisition of several long-standing European motor manufacturers. In 2011, the group acquired 97.94% of Austria's ATB Group, integrating mining motor brand Morley and marine generator supplier Laurence Scott. These acquisitions brought advanced winding designs and low-starting-current technologies into the Wolong product line.
Today, Wolong operates a manufacturing network that includes UK-based Brook Crompton, Germany's Schorch, vibration specialist OLI, and China's Nanyang Explosion-Proof Group. This integration enables the sharing of R&D assets and manufacturing standards across factories in China, Europe, and Asia, supporting the delivery of globally compliant industrial motors.
Deploying Specialized Motors in Harsh Environments and Heavy Processing Sectors
In oil refining, ethylene cracking, and natural gas transport, motors operate near explosive gases. Our YZYKS positive pressure and YB3/YBX5 flameproof high-voltage motors are designed to isolate potential ignition sources. Using internal air-to-water cooling (IC81W) systems, these motors run reliably at high loads in high ambient temperatures, driving critical pumps and process compressors.
For installations exposed to corrosive ocean salt spray, these motors are finished with multi-layer epoxy coatings and use stainless steel external hardware. The IP55/IP56 terminal boxes are sealed to prevent moisture ingress, helping to avoid insulation resistance drop during shutdown periods.
Underground coal mining requires robust motor designs due to high dust levels, damp conditions, and restricted space. The YBC series coal shearer motors are engineered with space-saving frames that fit into cutter loader bays while providing high breakdown torque. Water jackets are integrated directly into the stator frames to handle the thermal loads of continuous coal cutting.
For mine ventilation fans, our YKK and YRKK series high-voltage motors provide continuous air circulation. By matching the motor design with custom variable-frequency drives (VFDs), operators can adjust air flow rates to match underground activity, helping to optimize overall mine energy consumption.
Strategic Advice for Engineering Managers, OEM Buyers, and Plant Operations Directors
When procurement managers purchase high-capacity industrial motors, the initial purchase price represents only a portion of the lifetime cost. Over an operational life of 15 to 25 years, energy consumption, maintenance, and unplanned downtime make up the majority of the Total Cost of Ownership (TCO). Specifying IE4 or IE5 high-efficiency motors from Shaanxi Nanfang Motor Tech can help reduce energy consumption and lower operational costs.
Additionally, selecting the correct cooling system is critical for motor longevity. Air-to-air cooling (IC611) systems are self-contained and require minimal maintenance, making them suitable for remote installations. In contrast, air-to-water cooling (IC81W) systems are more compact and provide superior heat transfer, making them ideal for high-ambient process environments where cooling water is available.
To prevent on-site delays, we recommend incorporating standard factory testing into procurement contracts. Wolong testing facilities conduct Type Tests and Routine Tests, including winding resistance measurements, vibration checks, and load temperature tests, in accordance with IEC 60034 standards.
Our global engineering support network helps simplify cross-border compliance. Working with Shaanxi Nanfang Motor Tech provides access to engineering teams who can help align motor specifications with local grid parameters, hazardous area zones, and mechanical interfaces, reducing installation and commissioning risks.
Answers to Common Queries from Engineers and Procurement Teams
ATEX is a mandatory European Union directive applicable to equipment intended for use in explosive atmospheres within the EU. It includes both technical standards and quality system audits. IECEx is an international certification scheme designed to facilitate global trade by harmonizing standards for electrical equipment in explosive atmospheres. While ATEX is legally required in Europe, IECEx is widely accepted across global markets, including Australia, Asia, and the Middle East. Many of our explosion-proof motors carry dual ATEX and IECEx certification to simplify global compliance.
Wound rotor induction motors (slip-ring motors) are selected for applications that require high starting torque combined with a low starting current. By connecting external resistance to the rotor circuit via slip rings, operators can control the motor's torque-speed characteristics. This design is suitable for heavy-start equipment like ball mills, crushers, and long mining conveyors. Squirrel cage motors are generally preferred for standard applications due to their simpler, lower-maintenance design.
Positive pressure protection (Ex p, as used in our YZYKS series) maintains a continuous protective gas pressure (typically clean instrument air or nitrogen) inside the motor enclosure. This internal pressure is kept higher than the surrounding atmospheric pressure, preventing external explosive gases from entering the motor frame. Built-in pressure monitoring systems automatically sound an alarm or cut motor power if the purge pressure drops below the safety threshold, making it a reliable solution for high-voltage installations in Zone 1 environments.
All high-voltage stators undergo a Vacuum Pressure Impregnation (VPI) cycle in automated chambers. The stator is placed under a deep vacuum to remove air and moisture from the winding layers. Solvent-free epoxy resin is then introduced and pressurized, forcing the resin deep into the insulation structure. This process creates a void-free, mechanically rigid winding assembly that provides high thermal dissipation and protects the insulation against moisture and electrical tracking.
Standard high-voltage induction motors generally have a production lead time of 12 to 16 weeks. For custom-engineered motors requiring positive-pressure designs, specialized shaft configurations, or specific cooling methods, lead times range from 18 to 24 weeks. This timeline includes multi-physics design engineering, casting, copper coil winding, VPI processing, and factory testing. We work with global freight partners to manage delivery logistics to the job site.
Yes. Our variable frequency speed regulation motors (including the BPY-S30 and WEBP3 series) are designed to operate with modern third-party VFDs. These motors feature reinforced winding insulation to handle voltage spikes (dV/dt) from PWM drives and insulated non-drive end bearings to prevent damage from shaft currents. We also offer optional grounding brushes to protect the motor bearings.
Additional Industrial Designs, Coal Mining Drives, and Synchronous Grid Condensers
NANFANG
