Explore our premium industrial series engineered for extreme safety, peak efficiency, and maximum reliability under hazardous environments.
Xi’an Lite SIMO Motor Co., Ltd is an electric company, main enterprise specializing in the manufacturing of large/medium-sized, high/low voltage AC motors, DC motors, synchronous motor, and explosion-proof motor in the Chinese mechanical industry. SIMO is a comprehensive manufacturing and service supplier of motor design, manufacturing, mechanical processing, mold making, assembling. The Company ranks TOP in China’s motor industry as to its scale of production, and has maintained fast-growing development trend for consecutive years.
For decades, LITESIMO has stood at the absolute forefront of heavy industrial motor innovation in China and global export markets. Our design and manufacturing infrastructure is built to support the critical requirements of international markets seeking safe, explosion-proof power delivery solutions. With a persistent focus on global standards compliance, we consistently provide customized electrical drive systems that meet precise client specifications and strict regional operating regulations.
By leveraging our profound engineering expertise and modern R&D center, we have successfully developed high-efficiency motor options that directly address the rising global energy costs. Whether for hazardous gas groups, dust-ignition environments, or massive high-voltage grid integrations, SIMO remains the definitive benchmark for longevity, system security, and reliable electric power transmission.
Understanding the strict definitions, chemical conditions, and physical requirements behind explosion-proof safety standards.
In global industrial plants, the search term Ex Dii Bt4 (commonly labeled as Ex d IIB T4 under IEC and GB standards) defines a precise set of environmental defense levels:
Conventional motors run hot and produce electrical sparks during startup, reversing, or line fluctuations. In hazardous facilities filled with volatile hydrocarbons or organic dust, these small sparks can trigger catastrophic events.
An Ex Dii Bt4 explosion-proof motor mitigates these risks using a heavy duty cast-iron frame with precision-machined joints. The flameproof joints act as flame paths, cooling escaping combustion gases below their ignition temperature before they can escape. This mechanical isolation makes LITESIMO's flameproof motors the standard choice for refineries, paint booths, and processing plants globally.
The Company was founded in 1955 originally and now has more than 60 years history of motor manufacturing and selling. The registered capital is 21.5 million RMB. SIMO has 3 manufacturing factories, one subsidiary factory, with fixed assets 380 million RMB and more than 1172 sets of advanced equipment. There are more than 1200 employees, more than 260 technical engineers, including 21 senior engineers, 15 experts engineers.
SIMO Motor established and leaded by government.
Move to the new plant in Xi'an city.
Change name into Xi'an Motor Factory after series acquiring and integrating.
Reformed into limited company from stated owned factory.
SIMO motor group established, with 14 subsidiaries.
Moved to the high tech and advanced new plant.
Change name into Tech Full Simo Motor.
Still on the way to be one of the best motor manufacturers.
LITESIMO motors drive essential global infrastructures. From petrochemical plants to heavy mining operations, our explosion-proof systems operate in diverse applications.
Upstream, midstream, and downstream operations represent the primary operating fields for our Ex Dii Bt4 motors. Refineries processing high-pressure crude and volatile gases depend on these drives to operate chemical process pumps, pipeline compressors, and catalytic fans. Our motors undergo rigorous tests to handle voltage fluctuations and ensure uninterrupted performance under demanding operations.
Dust explosions are a serious hazard in industrial milling, grain silos, and bulk packaging plants. LITESIMO's dust-ignition-proof motors, including the YFB3 and YFB4 series, are built with tightly sealed enclosures that prevent conductive or non-conductive combustible dusts from getting inside. This design reduces operating temperatures and mitigates the risk of dust ignition.
Methane gas accumulation and coal dust are constant safety concerns in subterranean mines. LITESIMO provides robust YBX3, YBX4, and YBX5 explosion-proof low-voltage and high-voltage motors designed to withstand the harsh conditions of underground extraction. These motors feature robust frames that handle impacts and heavy vibrational stress from crushers, conveyor lines, and heavy-duty fans.
Large-scale water supply systems, municipal drainage plants, and cooling towers require high-power operations. LITESIMO high-voltage synchronous generators (TFW series) and wound rotor motors (YRKK, YRKS) deliver the continuous torque needed to manage large water volumes. Backed by modern heat exchangers, these units maintain lower operating temperatures to prolong bearing and insulation life.
LITESIMO offers a comprehensive catalog spanning 34 major series, more than 1,800 varieties, and more than 19,500 specifications, with a power range from 0.35kW to 25,000 kW. Our products meet modern industrial demands for performance and durability.
SIMO passed ISO9001 Quality System Certification, EU “CE", US “UL”, Russian "GOST", and so on. Electric motors are widely applied in electricity, coal, petroleum, mining, metallurgy, railway, transportation, chemical industry, agriculture, water economy, aviation, navigation and high technologies and other areas in China and abroad.
Operating globally requires strict compliance with localized certifications. LITESIMO works to align with local safety, environmental, and operating standards for all exported products. By maintaining certifications like CE for the European Economic Area, UL for North America, and GOST for the Eurasian region, we ensure our clients experience smooth import processes and hassle-free system commissions. Our explosion-proof products undergo continuous audits by third-party laboratories to verify the integrity of flameproof enclosures and terminal boxes under extreme pressure loads.
Building the next generation of smart, safe, and highly efficient electric motor systems for international heavy industries.
Global energy regulations are shifting toward ultra-premium efficiency targets to lower operational costs and carbon emissions. LITESIMO is expanding its YE5 and YBX5 lines to provide IE5-grade solutions for standard and explosive environments. By using low-loss silicon steel sheets and optimizing rotor slot designs, these motors minimize internal winding losses, delivering high energy efficiency under continuous operations.
The future of industrial motors lies in digitalization. LITESIMO is developing integrated sensor solutions designed for hazardous areas. These sensors monitor temperature rises, vibration signatures, and insulation resistance in real time. Advanced data processing allows plant engineers to predict bearing failures and plan maintenance schedules, avoiding unexpected operational shutdowns.
Technical answers to common questions about selection, standards, and applications for explosion-proof electric motors.
These groups classify explosive gases based on their Maximum Experimental Safe Gap (MESG) and Minimum Igniting Current (MIC) ratio. Group IIA gases (e.g., propane) are the least volatile, Group IIB gases (e.g., ethylene) are moderately volatile, and Group IIC gases (e.g., hydrogen, acetylene) are the most volatile. An Ex Dii Bt4 (IIB) motor is suitable for both IIB and IIA atmospheres but cannot be used in areas requiring a IIC rating.
Yes, provided the motor is specifically certified for VFD operation (such as the YBBP or YVFE3 series). Running a standard flameproof motor on a VFD without thermal monitoring can lead to higher winding temperatures at low speeds, which may compromise the T4 temperature rating.
The T4 rating limits the motor's maximum surface temperature to 135°C (275°F) under the most severe operating conditions. This prevents the motor frame from becoming an ignition source for external gases with auto-ignition temperatures above 135°C.
Flameproof joints must be inspected regularly for corrosion, scratches, or mechanical wear. Never paint these joints or apply non-approved sealants, as this can affect the gap dimensions and compromise the motor's safety rating.
Review our extended motor catalog for heavy industrial drives, including wound rotor high voltage, ultra-efficient induction, and high-performance DC motors.
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