Explore our first selection of heavy-duty industrial electric motors, designed for hazardous areas, mine milling, and variable speed operations.
A professional exploration of non-sparking (Ex Ec) and dust-tight (Ex Tc) containment solutions for modern industrial processing plants.
In petrochemical plants, grain processing facilities, mills, and mines, safety is of paramount importance. Global regulatory frameworks classify explosive environments into zones based on risk level and duration. To meet the demanding requirements of Zone 2 (gas) and Zone 22 (dust) environments without incurring the substantial weight and expense of traditional flameproof (Ex d/db) containment housings, the industry turns to specialized Ex Ec and Ex Tc motors.
Ex Ec (IEC/EN 60079-7): Transitioned from the legacy "Ex nA" (non-sparking) protection method, Ex Ec represents the latest evolution in "increased safety." These motors are precision engineered to ensure that during normal starting and operation, they cannot produce electrical arcs, sparks, or dangerously high temperatures that might ignite surrounding explosive gases (like hydrogen, ethylene, or methane). Crucial engineering specifications include tight control of air gap clearances, high-integrity insulation materials, and robust electrical connections that resist vibrations.
Ex Tc (IEC/EN 60079-31): Ex Tc design focuses on preventing fine, combustible dusts (such as coal dust, flour, grains, or wood fibers) from penetrating the motor enclosure and igniting on hot internal components. This requires strict IP ratings (IP5X or IP6X), special double-lip oil seals, high-temperature resistant gaskets, and thermal limitations to ensure the outer frame temperature remains safely below the glowing threshold of dust layers.
| Protection Code | Underlying Standard | Applicable Zone | Protection Mechanism | Primary Industry Application |
|---|---|---|---|---|
| Ex Ec (formerly Ex nA) | IEC/EN 60079-7 | Zone 2 (Gas) | Elimination of internal sparks and high temperature hot spots | Petroleum refineries, chemical transport, gas pump stations |
| Ex Tc | IEC/EN 60079-31 | Zone 22 (Dust) | Ingress protection (IP55/IP66) to exclude dust from reaching heat sources | Flour mills, sugar packaging, coal handling, grain elevators |
| Ex db (Flameproof) | IEC/EN 60079-1 | Zone 1 & 2 (Gas) | Containment of internal explosion within heavy cast enclosure | Offshore drilling rigs, hydrogen processing plants |
| Ex tb / Ex ta | IEC/EN 60079-31 | Zone 21 & 20 (Dust) | Extreme dust tightness with guaranteed surface temperature limits | Direct coal pulverized feeds, highly volatile dust silos |
From a state-owned enterprise in 1955 to China's leading medium and high voltage motor manufacturing powerhouse.
Xi’an Lite SIMO Motor Co., Ltd is a premier enterprise specializing in the research, design, and manufacturing of large/medium-sized, high/low voltage AC motors, DC motors, synchronous motors, and high-safety explosion-proof motors. Ranking at the top of China's motor industry in terms of production capacity and technological capability, SIMO is a complete, comprehensive supply-chain partner offering dynamic solutions from design to casting, machining, insulation encapsulation, assembly, and rigorous testing.
Our expansive industrial plant houses over 1,172 sets of advanced equipment, backed by an elite engineering team of over 260 technical specialists, including 21 senior engineers and 15 expert engineers. This core intellectual resource enables us to configure custom Ex Ec and Ex Tc motors designed specifically for international environments.
SIMO Motor established and led by the Chinese government, starting a rich engineering heritage.
Relocated to a dedicated, new manufacturing facility in the industrial zone of Xi'an city.
Renamed Xi'an Motor Factory following strategic industrial acquisitions and integrations.
Reformed into a highly efficient limited company, modernizing corporate governance.
SIMO Motor Group established, scaling operations up with 14 specialized subsidiaries.
Moved to the newly constructed, high-tech advanced manufacturing base in Xi'an.
Renamed to Tech Full Simo Motor, driving integration with global automated electrical standards.
Strengthening high-end R&D in variable frequency, high-voltage, and explosion-proof Ex Ec and Ex Tc motors.
Discover how SIMO blends raw-material cost advantages with cutting-edge engineering to serve global EPC contractors.
Our factory is located in the Xi'an industrial cluster, providing direct access to premium silicon steel, high-purity oxygen-free copper, and high-durability castings. This proximity dramatically reduces material lead times and transport overhead.
We supply motors conforming to ATEX, IECEx, UL, CE, and GOST certificates. We design and test Ex Ec and Ex Tc motors to ensure smooth approval processes with local health and safety regulatory boards globally.
Whether you require specific shaft extensions, dual-conduit terminal boxes, custom RTD sensors, space heaters, or non-standard flange mounting, our in-house engineering team provides rapid 3D CAD design turnarounds.
SIMO products conform to the highest safety and performance criteria recognized by prominent inspection authorities globally.
Our products meet standard qualifications including ISO9001 Quality System Certification, EU "CE", US "UL", Russian "GOST", and Chinese local explosion-proof frameworks. They are utilized extensively in coal mines, power generation, oil & gas drilling, steel metallurgy, agricultural ventilation, and municipal water conservancy.
High-efficiency operation in demanding gas and dust environments.
In refining areas where hydrocarbons, butane, or solvent vapors are processed, Zone 2 gases represent a continuous hazard. Ex Ec motors are used for large centrifugal pumps, high-pressure cooling fans, and compressor packages.
Fine dust from corn, wheat, or barley can ignite easily. Ex Tc motors feature tight IP65 seals that keep fine organic dust out of terminal connections and bearing housings, preventing explosive dust-ignition events.
Mines require high-starting-torque synchronous and asynchronous motors. Combining dust protection with gas safety, SIMO motors like the YB3, YBX4, and TDMK series run ventilation systems, conveyor belts, and grinding mills safely.
Ensure compliance, lower your TCO, and implement smart technologies when acquiring heavy-duty motors.
While the upfront purchase cost of a motor is a consideration, energy efficiency accounts for over 90% of a motor's lifetime operational cost. Selecting high-efficiency lines, such as the YE4 (IE4) and YE5 (IE5) series, can reduce power consumption in heavy-duty plants.
Modern industrial plants rely on variable-speed control. Sourcing VFD-compatible motors, such as our YBBP or YVFE3 lines, is critical. These motors are designed with reinforced winding insulation and insulated bearings to protect against voltage spikes.
The industry is moving toward smart, predictive maintenance. Ex-certified vibration sensors, winding RTDs, and bearing temperature detectors can be integrated directly onto SIMO motors, enabling you to detect potential mechanical issues before they occur.
Get answers to technical and regulatory questions about selecting, installing, and maintaining motors in explosive areas.
Review our second collection, featuring high-efficiency low-voltage induction motors, DC motors, and soft-start cabinets.
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