Explore our elite range of highly efficient, low voltage explosion-proof (Ex) motors designed for operations in hazardous environments worldwide.
Pioneering Heavy Industrial Drives and Electric Motors since 1955
Xi’an Lite SIMO Motor Co., Ltd stands as a cornerstone of China's heavy mechanical industry. Over the course of more than six decades, SIMO has grown into a highly comprehensive manufacturer and global service provider of electric motors. Our core capabilities cover motor design, mechanical processing, mold fabrication, assembly, and strict testing procedures.
Representing the peak of manufacturing scale in China's motor sector, we are dedicated to supplying standard and customized high/low-voltage AC motors, DC motors, massive synchronous generators, and specialized low-voltage explosion-proof (Ex) motors that sustain high-duty operations in extreme industrial environments.
Over 60 Years of Structural Evolution, Leading China's Industrial Drive Advancements.
SIMO Motor is established under state leadership, pioneering localized electrical machinery design to power China's initial industrial growth.
Relocation to a new dedicated industrial manufacturing site in Xi'an city, scaling up initial manufacturing processes.
Renamed to Xi'an Motor Factory following strategic government-led acquisitions and industrial integration.
Restructured into a modern shareholding limited liability company from a state-owned enterprise, driving technological agility.
Establishment of the SIMO Motor Group, expanding operations across 14 specialized subsidiaries and sub-factories.
Relocated to a newly constructed, state-of-the-art advancement plant in Xi'an's high-tech developmental zone.
Transitioned corporate naming to Tech Full Simo Motor, establishing a strong international footprint in global supply chains.
Executing Industry 4.0 methodologies to remain a premier worldwide manufacturer of low voltage explosion-proof motors.
Under the Hood of Xi'an SIMO’s Enterprise Motor Systems
Xi'an SIMO designs and manufactures a massive portfolio of motors. Our R&D covers 34 major series, including more than 1,800 varieties and over 19,500 distinct specifications. The power ratings span from a delicate 0.35 kW up to an ultra-heavy 25,000 kW. This encompasses high-efficiency low-voltage induction motors, heavy-wound rotor high-voltage motors, explosion-proof motors, large-scale synchronous motors, and high-torque DC motors.
Our motors are engineered to meet strict international criteria. Operating parameters like winding temperature limits and insulation systems are closely managed. Standard units feature Class F insulation with Class B temperature rise evaluations, and Class H is available for harsh environments. SIMO uses high-grade copper windings and Vacuum Pressure Impregnation (VPI) with solventless epoxy resin. This process minimizes air voids in the insulation, improving thermal dissipation and dielectric strength to protect against transient overvoltages and moisture ingress.
Decarbonization, Smart Diagnostics, and Material Advancements for Next-Gen Drives
We are transitioning our low-voltage AC induction and explosion-proof models from IE3/IE4 (YBX3/YBX4) configurations to IE5 (YE5/YBX5) ultra-premium efficiency standards. We achieve this by optimizing stator core laminations with low-loss silicon steel sheets and refining the rotor geometry to reduce overall copper and iron losses.
The integration of smart micro-sensors into the motor housing enables real-time monitoring of stator temperature, vibration (3-axis velocity), and bearing health. This data is fed into predictive maintenance platforms via Modbus/Ethernet protocols, preventing unplanned downtime in hazardous Zone 1 and Zone 2 operations.
We utilize customized Class H slot insulation alongside high-temperature lubricating greases. This setup enables our explosion-proof models to maintain full rated load torque under variable frequency drive (VFD) controls, even at low operating speeds where ventilation cooling efficiency drops.
How SIMO Solves Extreme Operational Challenges Across Vital Sectors
In oil refining, offshore drilling, and chemical synthesis, atmospheric gas mixtures represent a major risk. SIMO’s YBX3, YBX4, and YBBP series low-voltage explosion-proof motors are designed to contain internal explosions. The flameproof joints prevent hot gases from escaping and igniting surrounding atmospheric mixtures, meeting Zone 1, Zone 2, and gas groups IIA, IIB, and IIC requirements.
Mining operations require robust mechanical designs due to dust and abrasive materials. SIMO’s YBK3 flameproof motors are specifically engineered for underground coal mines, featuring heavy cast-iron frames that resist physical impacts. Similarly, our TDMK and large AC synchronous motors deliver high torque to run grinding mills and crushing plants under variable load conditions.
Pumping stations require continuous operation and high efficiency. SIMO's YE4/YE5 IE4/IE5 ultra-premium induction motors run continuously with minimal thermal stress, reducing energy consumption. IP55/IP56 ingress protection ensures stable operation in high-humidity pump rooms and wastewater treatment plants.
Boiler draft fans, large pumps, and heavy exhaust ventilation systems require reliable high-power motors. SIMO’s YKS and YXKK high-voltage motors feature dual-flow cooling systems (water-to-air YKS, air-to-air YXKK) that manage thermal performance under continuous heavy operation, maintaining high availability for utility generation plants.
Integrating Advanced Smart Manufacturing Processes
Our operations leverage 3 manufacturing plants and 1 specialized subsidiary facility. Our plant in Xi’an high-tech zone spans an impressive footprint equipped with 1,172 sets of advanced manufacturing and testing apparatuses. This extensive infrastructure provides complete control over the production workflow, from stator winding and CNC frame machining to rotor dynamic balancing and full load testing.
By keeping core processes like tool making, mechanical processing, and VPI varnishing in-house, we reduce dependency on external supply chains. This setup allows us to offer shorter lead times and adapt designs to specific requirements. Integrated production planning also helps optimize costs, allowing us to supply IEC, ATEX, and UL certified motors globally at competitive prices.
SIMO Motors comply with international quality, explosion protection, and efficiency standards
Our quality management system is certified to ISO9001. We maintain compliance certifications with various global standards agencies, including EU CE, American UL, and Russian GOST. Our explosion-proof motors are designed to satisfy international standards like ATEX Directive 2014/34/EU and the IECEx scheme, supporting smooth integration into complex projects globally.
Expert Answers on Designing, Operating, and Customizing Industrial Low Voltage Ex Motors
Ex d (Flameproof) is designed to withstand an internal explosion of a gas or vapor mixture. The flameproof joints prevent the flame or hot gases from escaping and igniting the surrounding explosive atmosphere. This is typical for gas groups IIA, IIB, and IIC (found in our YBX3 and YBX4 series).
Ex tb / Ex tc (Dust Ignition Protection by Enclosure) focuses on preventing dust ingress. The enclosure (IP65 or IP66 rating) prevents explosive dusts (such as coal dust, grain dust, or metal residues) from contacting hot internal components or sparks, protecting operations under heavy dust conditions (found in our YFB3 and YFB4 series).
Running a standard induction motor at low speeds under VFD control reduces the effectiveness of the shaft-mounted fan, which can lead to overheating if high torque is required. SIMO addresses this in our YBBP and YVFE3 variable frequency series with two key design choices:
We configure motors to project requirements, including:
VPI is a critical process for heavy-duty motors. It involves placing the wound stator under vacuum to draw out air pockets, then applying solventless epoxy varnish under high pressure to fully coat the windings. This process improves thermal conductivity, moisture resistance, and mechanical strength, helping the motor withstand the stresses of frequent starts and industrial duty cycles.
High-Efficiency AC/DC Motors, Synchronous Systems, and Mining Machinery
Lite Simo
