Examine our high-performance low voltage, high efficiency, and safety-certified electric motors built for severe environments.
Shaanxi Nanfang Motor Technology Co., Ltd. serves as the premier authorized distributor of Wolong Electric Drive Group Co., Ltd., presenting a unified infrastructure for heavy-duty rotary apparatuses.
Founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (code SH600580), Wolong has advanced motor and drive systems on a global scale. Operating 3 key manufacturing bases, 39 manufacturing factories, and 3 localized R&D hubs globally, Wolong maintains an expansive technical layout. At Shaanxi Nanfang Motor Technology, we integrate this technological powerhouse to deliver optimal foot-mounted electric motor systems, guaranteeing continuous uptime in demanding operations.
Foot-mounted configurations (IM B3 / IM 1001 according to IEC standards) form the backbone of industrial rotating machinery, delivering rigid shaft alignment and stable mounting bases.
Global regulatory landscapes are driving the phase-out of sub-standard motors. Modern factories prioritize WE3, WE4, and WEPM variable-frequency permanent magnet synchronous motors (PMSM) to achieve IE4 and IE5 efficiency levels, reducing total lifetime operating expenditures (OPEX).
WEPM series PMSM motors leverage rare-earth magnetic rotor assemblies, providing higher power density, lower heat generation, and superior torque characteristics at low frequency. This design reduces rotor core losses and optimizes overall motor dimensions.
Dynamic process controls require high-voltage and low-voltage variable frequency drives (VFD). Incorporating insulated bearing architectures (such as hybrid ceramic bearings) protects the motor from shaft currents caused by high-frequency VFD switching.
Procurement divisions require motor assets that comply with safety, structural, and ecological regulations across global jurisdictions.
Critical for chemical plants, refineries, and mining facilities. Our YBBP, NEXP, and TAW explosion-proof motors are certified for Zone 1, Zone 2, Zone 21, and Zone 22 applications, conforming to international safety standards.
Offering permanent magnet and standard induction solutions compliant with IEC 60034-30-1. Upgrading to IE4/IE5 efficiency reduces utility costs and lowers CO2 emissions, supporting corporate sustainability targets.
Providing heavy-duty, low-vibration cast iron structures (frame sizes 80 to 630+). These motors are engineered to withstand continuous load variations, torsional vibrations, and external mechanical impacts.
| Application Standard | Target Geographic Region | Applicable Regulatory Directives | Design Characteristics & Protection Types |
|---|---|---|---|
| IEC Standard | Europe, Asia-Pacific, South America | CE, ATEX, IECEx, RoHS | Metric system frames, IP55/IP56, Class F/H insulation, Ex d/de/ec protection modes. |
| NEMA Standard | North America (USA, Canada, Mexico) | UL, CSA, IEEE 841, DOE Efficiency | Imperial dimensions, Service Factor (SF) 1.15, severe-duty construction, explosion-proof class/division setups. |
| Marine & Offshore | International Shipyards & High-Seas Platforms | DNV, ABS, BV, Lloyd's Register | YQ marine motor series, anti-corrosive epoxy coat systems, condensation heating, salt-spray protection. |
| Heavy-Duty Mining | Global underground coal mines | TestSafe, MSHA, MA (China) | Morley wet-environment and flameproof structures, water-cooled enclosures, high mechanical stress mitigation. |
Inside Wolong's industrial motor product range, engineered components ensure high durability, stable output, and thermal dissipation.
Our rotors employ a squirrel cage architecture, with cast aluminum components produced via advanced centrifugal casting or high-pressure die-casting. This process forces molten pure aluminum into the core slots, forming integrated rotor bars and end-rings. This construction ensures high structural reliability and excellent start-up and running torque characteristics. For large-capacity motors, copper bar rotors are utilized, featuring secure slot-bar layouts and robust end-ring welding procedures. Dynamic balancing to G1.0/G2.5 limits (ISO 1940) minimizes residual vibration, extending bearing life in severe applications.
The stator coil is wound with premium round or flat copper wire, insulated with polyester film, glass cloth backing, and high-grade mica tapes. Our stators undergo the Vacuum Pressure Impregnation (VPI) process to ensure void-free insulation resin coverage. The result is a robust stator assembly featuring high dielectric strength, mechanical stability under load cycles, moisture resistance, and thermal endurance (exceeding Class F requirements with Class B temperature rise margins).
The motor housing is developed using digital multi-physics simulation platforms, optimizing air path dynamics and structural rigidity. Made from high-strength grey cast iron (or structural steel for custom configurations), the frame offers structural margin and thermal dissipation. The foot-mounted configurations (IM B3) feature solid, integrated feet designed to handle mechanical shocks, minimize vibration levels, and isolate resonant frequencies from connected equipment.
The low-noise ventilation system consists of an engineered fan cover, an air-guide cylinder, safety inlet windows, and silencer plates. The optimized air intake profile minimizes turbulence and air resistance, reducing acoustic signatures caused by energy losses in the air stream. The fan hood complies with IP22/IP23 finger-safety requirements while ensuring cool air is directed along the frame fins, keeping the motor operating at stable temperatures.
Through strategic acquisitions of established global motor manufacturers, Wolong has consolidated centuries of engineering expertise into a unified industrial drive network.
In 2011, Wolong acquired 97.94% of the Austrian ATB Group. This integration brought the Morley brand, with nearly 130 years of underground coal mining motor expertise, into our group. It also included Laurence Scott, a pioneer in low-starting-current motors for nuclear power facilities and naval support vessels. This acquisition established Wolong as a manufacturer of highly specialized electric machines for demanding applications.
Brook Crompton brought over a century of experience in motor design and innovation to the group. Known for developing energy-efficient designs, Brook Crompton has created a complete range of low, medium, and high-voltage AC motors. This includes the premium "W" and "10" series, engineered for reliable operation in hazardous and harsh industrial environments.
Schorch joined the Wolong Group in 2011, bringing a reputation for high-quality heavy-duty drive systems. Schorch motors are widely used in critical applications including petrochemical refineries, municipal water systems, shipbuilding, steel processing, and wind tunnels, offering high reliability in large frame ratings.
Dating back to 1999, Wolong established a partnership with OLI. Today, OLI is a leading global brand for industrial vibration motors (MVE series) and vibration sensors. This technology supports bulk material handling, concrete compaction, and agricultural process industries worldwide.
In 2015, Wolong integrated China's Nanyang Explosion-Proof Motor Group (CNE), expanding our hazardous-area product portfolio. In 2018, GE Industrial Motors joined the group, bringing commercial and industrial drive technologies. This integration strengthened our capabilities to support global heavy industries, including oil and gas, petrochemicals, mining, power generation, and water treatment.
Wolong's manufacturing processes and product lines are certified to conform to major international engineering standards, enabling access to global industrial projects.
Nemko / ATEX
CSA
CE
CCC
SABS
TESTSAFE
ISO 9001: Quality management systems verify that motor design, material procurement, manufacturing tolerances, and final load testing comply with international quality standards.
NEMA Standards: Confirms Wolong's electric motors meet NEMA mechanical and electrical performance requirements. Testing includes efficiency verification, insulation resistance testing, starting current/torque measurement, durability, and vibration limits.
IECEx and ATEX: Mandatory for explosive atmospheres (EU and global). Certification covers flameproof (Ex d / Ex db), increased safety (Ex e / Ex ec), dust-ignition proof (Ex t), and positive pressure (Ex p) protective configurations.
TESTSAFE: Certification through Testsafe, an established coal product certification body, provides access for Wolong's mining motors and specialized heavy-duty equipment to the Australian and international coal mining sectors.
We design integrated motor-drive systems to meet evolving industrial requirements for high efficiency, predictive maintenance, and operational reliability.
Next-generation Wolong motors feature smart vibration accelerometers, RTD winding probes, and magnetic flux sensors. These components monitor motor health in real-time, allowing operators to transition from scheduled maintenance to predictive intervention, reducing unplanned downtime.
Research focuses on nanostructured insulation resins to withstand high dV/dt stresses from next-generation wide bandgap (SiC/GaN) VFDs. Development also includes high-temperature slot liners and magnetic steel alloys to reduce stray load losses.
Aligned with global net-zero goals, Wolong's manufacturing bases utilize green electricity, optimize material utilization, and source recycled copper and aluminum. This approach reduces the embodied carbon footprint of our heavy industrial motors.
Our motor solutions support heavy machinery operations across diverse industrial sectors: fans, cooling tower assemblies, centrifugal water pumps, screw and reciprocating compressors, conveyors, crushers, and marine propulsion equipment. We serve industries including commercial ventilation, oil and gas extraction, petrochemical refining, coal processing, metallurgy, nuclear power generation, and automated manufacturing systems.
Technical details and selection criteria for industrial foot-mounted (IM B3) motors.
IEC IM B3 motors (per IEC 60034-7) feature metric shaft, keyway, and mounting foot dimensions, with the terminal box typically positioned on top or right-hand side facing the drive end. NEMA foot-mounted motors use imperial dimensions. NEMA F-1 configurations place the conduit box on the left-side (facing opposite drive end), while F-2 places it on the right-side, requiring careful shaft and foundation alignment planning during retrofits.
The VPI process extracts air and moisture from the stator coils using vacuum pressure, then injects solventless epoxy resin under high pressure. This eliminates internal voids and air bubbles, preventing partial discharge (corona effect) caused by high-voltage spikes (dV/dt) from VFD switching, ensuring stable operation under continuous inverter control.
Cast aluminum rotors are suitable for standard medium-duty motors due to their cost efficiency and reliability. For high-power applications (above 200 kW) or equipment with high starting inertia and long starting periods (such as heavy crushers and large fans), copper bar rotors are preferred. Copper's higher thermal conductivity and lower electrical resistance reduce rotor losses, limit heating, and improve overall efficiency.
VFD operation can induce shaft voltages that lead to electrical discharge through the bearings (machining/pitting). For motors above frame size 280, we recommend using an insulated bearing on the non-drive end (NDE) or hybrid ceramic bearings with silicon nitride rolling elements. For large motors, grounding brushes on the drive-end shaft discharge stray currents safely to the frame.
Water-cooled motors utilize an internal cooling jacket, eliminating the need for an external fan and reducing acoustic noise. This design keeps the motor's outer surface temperature low, which is beneficial in hazardous environments containing combustible dust or gases with low ignition points, while protecting the motor from corrosive ambient air.
DNV Type Approval verifies that our YQ series low-voltage marine motors meet the rigorous standards of maritime classification societies. This certification ensures the motors' design, materials, and safety systems can withstand offshore environment conditions, including structural vibration, high humidity, salt corrosion, and wide temperature variations.
Review our specialized high-voltage, synchronous, brushless, and explosion-proof motors engineered for heavy industrial operations.
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