Explore our elite portfolio of CE-certified motor designs optimized for flameproof applications, high starting torques, and severe industrial duties.
Within modern heavy industrial drives, the demand for Low Voltage High Torque (LVHT) motors has escalated significantly. These specialized electrical machines bridge the gap between high-power starting requirements and the physical/safety limitations of low-voltage electrical systems (typically defined as voltage levels under 1000V AC). Ensuring compliance with CE Certification is critical for deployment in the European Economic Area (EEA), establishing that the motors meet strict safety, health, and environmental protection standards under directives such as the Low Voltage Directive (LVD) 2014/35/EU and the Electromagnetic Compatibility (EMC) Directive 2014/30/EU.
For applications such as conveyor drives, coal shearers, tunnel boring machines, compressors, and high-capacity water pumps, managing starting current while maximizing mechanical torque is a complex electrical engineering challenge. These environments demand robust magnetic circuits, high slip control, superior thermal margins, and, in many cases, certified flameproof or increased safety construction. Wolong Electric Drive Group, partnering globally with specialized distributors like Shaanxi Nanfang Motor Technology Co., Ltd., offers an extensive portfolio of high-efficiency low-voltage solutions engineered to thrive under severe-duty cycles (S1 to S9) in hazardous and non-hazardous fields alike.
Shaanxi Nanfang Motor Technology Co., Ltd. is the authorized global distributor of Wolong Electric Drive Group Co., Ltd. Founded in 1984 and listed on the Shanghai Stock Exchange in 2002 (code SH600580), Wolong has grown to become a preeminent force in the global motor manufacturing industry. Through structured international mergers, acquisitions, and technological integrations, Wolong has consolidated several of the world's most historic and technologically advanced motor brands under one parent corporation. This strategic synergy provides an unmatched depth of manufacturing and R&D capability:
Acquired in 2011, ATB is one of Europe's top three motor manufacturers. It includes industry-defining sub-brands such as Morley (130+ years of underground mining excellence) and Laurence Scott (low starting current machines for nuclear plants and naval vessels).
An icon in the electric motor sector with over a century of experience in motor design and technology. Brook Crompton is a pioneer in energy-efficient motors, contributing advanced frame design patents and specialized variable speed drive packages.
Founded in 1882, Schorch represents the gold standard for heavy-duty industrial drive systems, offering specialized engineering for hazardous areas, offshore marine operations, oil & gas installations, and high-capacity municipal water grids.
A global leader in industrial vibration motor technology (MVE series) and Ex vibration sensors. Wolong's joint operations with OLI since 1999 have secured the group the largest global market share in flow aids and vibrating equipment drives.
In 2018, General Electric's commercial and heavy industrial motor division joined the Wolong Group. This integration brought century-old heavy industrial expertise, American NEMA compliance patents, and high-torque mechanical engineering systems into the group.
Joining the group in 2015, China's largest explosion-proof motor R&D and manufacturing base provides cutting-edge tech in flameproof enclosure designs, high-efficiency cooling, and high-voltage composite explosion protection.
Industrial motors must endure continuous thermal and mechanical stress. Our low-voltage high-torque motors are engineered with structural redundancy and premium materials.
Our rotors feature premium squirrel cage designs. Cast aluminum rotors are produced using advanced centrifugal aluminum casting or high-pressure die-casting techniques. This technique forces molten pure aluminum into the laminations of the rotor core, creating a seamless, single-piece structure that integrates the rotor bars and end rings. The absolute integrity of the cast aluminum structures prevents localized high resistance, maintaining superb torque curves. For heavy duty and higher-power ratings, copper bar rotors are utilized with high-specification brazing and end-ring welding. For high-speed applications, retaining ring structures prevent dynamic distortion under centrifugal force.
Stator coils are wrapped using a combination of premium polyester film, glass cloth, and rich mica tapes. Following the winding process, the entire stator undergoes Vacuum Pressure Impregnation (VPI). VPI removes moisture and air pockets from the slots, replacing them with a highly cross-linked insulation resin that cures into a rigid, void-free structure. This delivers superior dielectric strength, exceptional resistance to moisture and chemical attack, and excellent thermal conductivity, keeping the motor within its Class F or Class H thermal limits even during continuous overload operations.
Our motor frames are engineered utilizing multi-physics simulation platforms, optimizing both structural rigidity and thermodynamic flow. Constructed from high-tensile cast iron or fabricated structural steel, the frames provide generous structural safety factors and excellent heat dissipation. Heavy external cooling ribs are positioned to optimize air flow paths. The internal rib distribution ensures high torsional stiffness, dampening harmonic vibrations and protecting the bearings and stator alignment from torque pulsations during startup.
The cooling system consists of a low-noise fan, an aerodynamic air guide cylinder, protective mesh windows, and integrated silencer panels. The air intake is positioned on the side to prevent restriction from adjacent structures. Sound-absorbing materials are strategically integrated within the air paths to reduce aerodynamic shear noise. The fan cover delivers IP22 protection, preventing accidental touch or ingress of debris, ensuring constant, unrestricted airflow over the frame cooling ribs.
To facilitate trouble-free import, local grid connection, and regulatory compliance in different parts of the world, Wolong maintains a vast directory of third-party certifications.
ATEX / Nemko
CSA Standard
CE Compliance
CCC Ex
SABS South Africa
TestSafe Australia
At the center of Wolong’s global manufacturing engine lies a network of highly automated, digitalized production hubs. These facilities represent the peak of China Factory 4.0, integrating intelligent systems to control production quality and optimize cost efficiency. Rather than relying on traditional assembly lines, Wolong uses robotic stator winding arrays, computer-controlled automatic VPI chambers, and automated dynamic balancing platforms to guarantee that every motor is built to exact tolerances.
This localized supply chain integration provides significant structural resilience for global EPC (Engineering, Procurement, and Construction) companies. By sourcing essential laminations, high-grade copper wires, and heavy cast iron casings within a localized raw-material cluster, the factory reduces lead times and minimizes exposure to global shipping volatility. Under strict ISO 9001, ISO 14001, and ISO 45001 management systems, Wolong balances cost-efficiency with high-quality engineering. Global buyers gain access to premium European and American heritage technologies (such as ATB, Laurence Scott, Schorch, and GE) optimized by the scale and speed of Chinese production hubs.
The industrial motor sector is undergoing a transformation driven by efficiency regulations and digitalization. Wolong's technology roadmap focuses on three main developments:
Although IE3 remain the minimum requirement in many jurisdictions, Wolong’s R&D focuses on expanding the range of YE5 ultra-high-efficiency induction motors and TBVF permanent magnet synchronous motors. By optimizing magnetic materials and reducing rotor resistance losses, our designs satisfy the highest IE5 parameters, substantially lowering lifetime carbon footprints and operating costs for continuous-duty industrial sites.
Traditional fixed-speed induction motors are increasingly replaced by Variable Speed Drives (VSD). Our new permanent magnet (PM) synchronous systems, like the TBVF series, provide high torque output even at low operating speeds. Unlike typical induction motors that experience reduced cooling and efficiency at low speeds, PM synchronous motors maintain constant torque, making them ideal for heavy starting loads such as slurry pumps and mine conveyors.
To reduce unplanned downtime, Wolong motors can be fitted with integrated diagnostic arrays. These sensors monitor bearing temperature, stator vibrations, and insulation degradation in real time. Using OLI vibration-sensing expertise, these systems detect alignment issues or bearing wear early, allowing operators to plan preventative maintenance and avoid costly system failures.
Our low-voltage high-torque motors are designed to meet the rigorous demands of heavy industries, from underground mining to marine environments.
Underground mining requires explosion-proof safety and high starting torque. Operating in tight, methane-rich spaces, motors like the YBS / YBSD series drive high-capacity armored face conveyors. These motors provide high pull-up torque to start fully loaded belts from a standstill without overloading the mine's power system.
Tunneling cutters face severe shock loads, shifting geology, and heavy vibrations. The YBU/YBUS/YBUD series is designed with reinforced cast steel frames and heavy-duty windings to absorb mechanical shocks, maintaining stable torque under variable rock loads.
Municipal water networks rely on continuous, high-efficiency operation. Heavy water pump motors, including the YBRB flameproof series, run continuously in wet environments. Their high-efficiency design helps reduce municipal electricity costs, while their high starting torque handles fluid inertia in long pipelines.
Refineries and petrochemical plants process volatile hydrocarbons, requiring reliable flameproof containment. Wolong’s certified motors, such as the YB3 and YE5 series, prevent gas ignition, operating reliably in continuous-duty applications like compressors, fans, and mixers.
Common questions from industrial procurement teams and project engineers regarding the selection and deployment of low-voltage high-torque motors.
A: Our low-voltage high-torque series, such as the YBS and YBK3 mine-duty motors, typically achieve a starting torque ratio (Tst/Tn) between 2.0 and 2.8, depending on the specific model. This high starting torque is achieved by optimizing the rotor slot geometry (deep-bar or double-cage designs) to utilize the skin effect during startup, maximizing initial resistance and torque while keeping starting current in check.
A: Variable Frequency Drives (VFDs) can introduce voltage spikes (high dV/dt) that stress stator insulation. To protect against this, our motors feature vacuum pressure impregnation (VPI) using class H resin and mica tape insulation. This process eliminates internal air gaps and creates a void-free winding structure that resists corona discharge and voltage spikes, ensuring a long operating life even when driven by modern IGBT converters.
A: Ex d (flameproof) motors are built with heavy cast enclosures designed to contain an internal explosion of gas or dust without allowing it to propagate to the surrounding atmosphere. Ex e (increased safety) motors focus on preventing any electrical arcs, sparks, or hot surfaces from developing during normal operation and starting. Wolong offers composite Ex de configurations, which combine a flameproof stator casing with an increased-safety terminal box for easier field wiring.
A: Squirrel cage induction motors rely on rotor slip and induction, which can lead to reduced efficiency and high heat generation at low speeds, often requiring external forced cooling fans. In contrast, Permanent Magnet Synchronous Motors (like the TBVF series) run in synchronization with the stator magnetic field, maintaining high efficiency and full rated torque down to zero speed without overheating. This makes them ideal for high-inertia startup applications.
A: Australia's coal mining industry enforces strict safety standards, particularly AS/NZS 60079. TestSafe is the authorized testing body in the Southern Hemisphere that verifies compliance with these standards. Wolong’s TestSafe certification verifies that our explosion-proof mining motors conform to Australian requirements, allowing direct integration into local mining projects without additional onsite testing.
A: The YBU series features a high-tensile cast steel or heavy-walled cast iron frame designed to absorb mechanical shocks. Stator windings are reinforced with additional slot packing and end-winding bracing to prevent movement from vibration. Additionally, we use heavy-duty roller bearings housed in reinforced end-shields to ensure mechanical alignment is maintained under heavy radial and axial loads.
Explore our specialized heavy industrial products, designed for high-inertia conveyors, cutting drums, and marine applications.
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