Leading-edge flame-proof and heavy-duty industrial electric motors engineered to withstand hazardous environments.
Xi’an Lite SIMO Motor Co., Ltd stands as a pillar enterprise specializing in the R&D, manufacturing, and servicing of large and medium-sized, high/low voltage AC motors, DC motors, synchronous motors, and highly engineered explosion-proof (flameproof) motors in the Chinese machinery industry.
For decades, SIMO has established itself as a comprehensive manufacturing superpower integrating state-of-the-art electric motor design, mechanical processing, mold fabrication, precision assembly, and rigorous safety testing. Ranked at the absolute top tier of China's motor sector, we represent unparalleled scale, technology, and service reliability.
A heritage built since 1955, driving technological milestones in heavy motor production.
SIMO Motor is established and led by the Chinese national government to kickstart heavy industrial motor production.
Relocation to our expansive, optimized manufacturing facility in Xi'an City to meet domestic high-power requirements.
Rebranded as Xi'an Motor Factory after extensive resource integration and key industry acquisitions.
Transitioned successfully from a state-owned industrial enterprise to a modern limited liability corporation.
SIMO Motor Group is established, structuring 14 specialized subsidiaries under one core brand.
Operations move to our current High-Tech Industrial Zone plant, equipped with fully automated CNC machining centers.
Positioned firmly as one of the premier heavy-duty AC/DC and explosion-proof motor manufacturers globally.
Executive Summary: Modern chemical, petrochemical, oil, and gas extraction processes present volatile and unpredictable atmospheres. In these critical environments, electric motors must perform flawlessly while neutralizing ignition risks. This whitepaper analyzes the engineering principles behind Ex d / Ex e flame-proof and explosion-proof asynchronous motors, identifying critical safety parameters, compliance standards, and raw material strategies for global procurement teams.
In industrial safety, "Flame Proof" (Ex d) and "Increased Safety" (Ex e) represent two distinct protection strategies outlined by the International Electrotechnical Commission (IEC). An Ex d flameproof motor is designed with an enclosure capable of withstanding an internal explosion of a flammable gas mixture. It must prevent the transmission of the internal explosion to the surrounding explosive atmosphere.
Key to this concept is the "flame path" (or joint gap). Flame paths are engineered channels where the metallic components of the motor housing meet. When an internal spark ignites gas within the motor casing:
Conversely, Ex e increased safety motors focus on preventing hot spots, sparks, or arcs from forming in the first place through premium insulation, controlled winding temperatures, and specialized terminal block designs. Incorporating these dual-layer protections (Ex de) represents the peak of modern engineering for high-risk zones.
Specifying the correct explosion-proof motor requires matching the equipment rating with the specific hazards present. Motors are classified according to gas groups and maximum surface temperatures:
SIMO provides a comprehensive catalog with 34 major series, 1,800 varieties, and over 19,500 specific configurations. Our outputs span from 0.35 kW up to 25,000 kW to power heavy infrastructure globally. Below are our specialized manufacturing samples:
How localized supply chain integration and manufacturing scale translate to global competitiveness.
Chinese industrial clusters, particularly in historic engineering hubs like Xi'an, leverage localized raw materials. This includes ultra-high-grade electromagnetic silicon steel sheets and 99.99% pure oxygen-free copper coils, eliminating logistics delays and raw material markups.
We implement state-of-the-art Vacuum Pressure Impregnation (VPI) equipment. Vacuum extraction followed by high-pressure epoxy resin application guarantees class-H insulation and void-free windings, offering high resistance to chemical degradation and moisture ingress.
Every flame-proof housing is subjected to hydrostatic pressure testing, dynamic balancing, and insulation tests under extreme operating parameters. This ensures 100% compliance with international standards like ATEX, IECEx, UL, and GOST before dispatch.
The global industrial landscape is undergoing major shifts due to carbon neutrality goals, digital transformation, and safety regulation updates. Our engineering department identifies the following core trends:
Customized drive solutions for high-risk, high-load sectors globally.
Purchasing heavy flame-proof electrical equipment requires thorough quality assurance. When importing high-power explosion-proof machinery from China, procurement engineers should utilize the following compliance checklist:
SIMO meets globally recognized standards for electrical quality, safety, and reliability.
Detailed engineering answers regarding motor protection, maintenance, and sourcing.
Complete selection of low voltage, variable frequency, and high-efficiency electric motors.
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