Engineered for complex load dynamics, certified safety, and high-efficiency standard compliance.
Shaanxi Nanfang Motor Technology Co., Ltd is the authorized distributor of Wolong, a globally dominant powerhouse in electric drive engineering. Wolong Electric Drive Group Co., Ltd was founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (code SH600580).
With over 30 years of continuous growth, Wolong operates 3 R&D centers, 39 manufacturing factories, and 3 global production bases. Dedicated to premium industrial motors and control systems, Shaanxi Nanfang Motor acts as the critical bridge to bring these world-class, energy-efficient solutions to heavy industrial applications worldwide.
Through key strategic acquisitions, Wolong has combined centuries of industrial heritage with advanced manufacturing technologies.
Acquired in 2011. One of the top three major European motor manufacturers, bringing elite Austrian technology to heavy industries.
Over a century of mastery in motor design and technological innovation, producing highly efficient "W" and "10" series motors.
Founded in 1882 in Germany. Standardizing heavy-duty drive systems for petrochemicals, water management, and shipbuilding.
China's largest explosion-proof motor scientific research and production base, acquired in 2015 to dominate safety applications.
The consolidation of global leaders including Morley (underground mining specialists for 130 years), Laurence Scott (providing low-starting-current motors for defense and nuclear plants), and the industrial division of General Electric (GE) in 2018 has established Wolong as an unrivaled player in the motor industry. These integrations combine European precision engineering, NEMA-compliant reliability, and massive scaling efficiency.
Under the hood of our high-quality frequency drive motors are precision-machined elements designed for high thermal stability and electrical performance.
Our motors utilize precision-fabricated squirrel cage rotor designs, offering cast aluminum configurations processed through die-casting or centrifugal casting. By casting pure aluminum directly into the core slots, we create a unified, robust structure that delivers outstanding starting torque.
For high-capacity motors operating on VFDs, we employ copper bar rotors with advanced end-ring welding technology. This setup features specialized retaining rings to withstand mechanical stress under high-speed operations and high dV/dt rates.
The winding structure uses high-quality polyester film layered with glass cloth and high-mica-content tape. Through the Vacuum Pressure Impregnation (VPI) process, the entire stator core is sealed, curing into a dense, solid component.
This process eliminates air pockets, providing resistance to moisture, chemical corrosion, and mechanical vibration. The result is class F or H thermal insulation that tolerates the voltage spikes common to variable frequency drives.
Our motor frames are optimized using multi-physics simulation platforms modeling both mechanical stress and fluid dynamics. Constructed from high-tensile cast iron or fabricated steel, these frames are built with structural margins to isolate natural frequencies and minimize resonant vibration.
This thermal-fluid design enhances heat dissipation across the rib structures, maintaining low winding temperature rises even when running at low speeds under constant torque loads.
Operating a motor under high carrier frequencies can generate acoustic noise. To address this, our design integrates a lightweight, low-noise fan cover, air guide cylinder, protective window, and silencing baffle plates.
Its side-inlet configuration reduces intake turbulence and flow restriction, lowering overall noise levels. Rated to IP22 ingress protection, the system prevents accidental contact with the fan blades during operation.
Our compliance with international standards helps streamline global procurement, customs clearing, and local site installations.
ATEX
CSA
CE
CCC
SABS
TestSafe
A technical overview of design improvements, efficiency trends, and the advantages of Chinese industrial manufacturing.
Running a standard AC motor on a Variable Frequency Drive (VFD) exposes it to harmonic voltages, high-frequency currents, and thermal stress. The high-speed switching frequencies of modern IGBT inverters cause high rate-of-rise voltage spikes (high dV/dt).
Without adequate corona-resistant enameled wire, phase barriers, and insulated bearings, standard motor windings can degrade prematurely, leading to ground faults.
The industry is shifting from traditional induction motors toward permanent magnet technology (such as the WEPM series). This combination reduces rotor copper losses, helping motors meet and exceed IE5 ultra-premium efficiency standards.
Integrating this technology with VFDs enables stable torque delivery across a wide operating range, helping plants reduce energy consumption in variable load applications like pumps, fans, and compressors.
Our manufacturing facility in China leverages localized access to rare-earth magnets (NdFeB) and raw copper, combined with automated precision winding lines.
This integration allows us to produce customized mechanical shafts, non-standard mounting configurations, and multi-voltage ratings with competitive lead times, ensuring prompt deliveries for global industrial projects.
Industrial plants require unified electrical solutions rather than standalone components. Shaanxi Nanfang Motor provides integrated motor-drive packages engineered to minimize electrical resonance:
Explosion-proof motors (YBBPX, YZYKS, YBXKK) paired with VFD panels, equipped with certified flameproof terminal boxes, internal thermistors (PT100), and space heaters to prevent moisture condensation.
Designed to withstand mechanical shock in low-seam applications. Water-cooled or flameproof structures (YBC, YBSD) ensure safe operation in methane-rich coal faces.
DNV-certified marine motors (YQ Series) featuring anti-corrosive coatings, stainless steel hardware, and windings designed to tolerate high saline moisture.
High-voltage induction motors optimized for municipal pumping stations. These motors are engineered for soft-starting capabilities to prevent water hammer in long pipelines.
A reference guide for engineering procurement departments specifying large variable-speed AC motors.
| Selection Factor | Standard AC Induction Motors | Premium VFD-Rated Motors (Our Spec) | Permanent Magnet Synchronous (PM) |
|---|---|---|---|
| Insulation Grade | Class F (Standard Wire) | Class F or H (VPI, Corona-Resistant) | Class H (VPI, High Thermal Capacity) |
| Speed Turndown Ratio | 2:1 or 4:1 (Variable Torque) | 10:1 (Constant), 20:1 (Variable) | 100:1 (Full Constant Torque from 0 RPM) |
| Cooling Methods | IC411 (Self-Ventilated Fan) | IC416 (Forced Ventilation) or IC411 | IC411, IC416, or Liquid/Water Cooled |
| Bearing Protection | Standard steel ball bearings | Insulated bearings + Shaft grounding brush | Hybrid ceramic bearings + Grounding rings |
| Efficiency Target | IE2 / IE3 Class | IE3 / IE4 Class | IE5 Ultra-Premium Class |
Answers to technical questions regarding our frequency drive motors and services.
VFD-rated motors feature enhanced winding insulation (often VPI processed) to withstand voltage spikes (dV/dt) from inverter switches. They also incorporate insulated bearings or grounding rings to prevent electrical erosion and are designed with cooling configurations (like forced ventilation) to dissipate heat when running at low speeds.
We use insulated bearings (typically on the non-drive end) and shaft grounding rings. These components help divert stray shaft currents away from the bearing raceway to the ground, protecting the rolling elements from pitting and electrical fluting.
Yes. Our flameproof (Ex d) and positive pressure (Ex p) motor series, such as YBBPX and YZYKK, are certified under international systems including ATEX, IECEx, CSA, and CCC, making them suitable for petrochemical and gas processing plants.
Yes. Our motors are designed to operate with standard VFD inverters from major global manufacturers. We recommend configuring the drive parameters to match the motor nameplate values, including voltage-to-frequency curves and current limits.
For operations requiring continuous constant torque at low speeds, we provide auxiliary blowers (IC416 cooling). This independent fan maintains constant cooling airflow, preventing thermal buildup in the motor frame.
Yes. Permanent Magnet Synchronous Motors (PMSMs) do not have a slip-start capability like induction motors. They must be operated with a VFD that supports PM motor control algorithms for start-up and speed regulation.
We provide a standard 12-month warranty from commissioning or 18 months from delivery. Extended warranty options, field start-up assistance, and preventative diagnostic services can be arranged upon project specification.
Yes. Our engineering department can customize shaft diameters, keys, flanges, and terminal box orientations to facilitate replacements or fit custom machinery footprints.
Designed for severe duty environments, underground mines, and high-temperature safety applications.
NANFANG
