Engineered for high performance, continuous reliability, and certified safety compliance across petrochemical, mining, and industrial sectors.
The global demand for high-reliability, explosive-proof drive systems continues to expand under tight regulatory conditions. Exe (Increased Safety) explosion-proof motor technology represents a critical line of defense in modern processing environments. Unlike traditional Exd flameproof configurations, the primary structural philosophy of Exe relies on a system of preventive engineering. The design prevents the generation of sparks, internal arcs, and thermal hot spots under both standard running states and specified abnormal conditions. As industrial operations in petroleum refining, natural gas storage, maritime transport, and grain processing demand longer duty cycles and high efficiency, Exe protection solutions serve as the primary architecture for risk mitigation.
From a macro commercial standpoint, key procurement sectors have experienced strict mandates for safety integration. Major project developers, particularly across the Middle East, the North Sea, and North America, have shifted their project specifications towards motors featuring higher insulation integrity, precise thermal tracking, and rigorous enclosure sealing. Modern Exe motors must balance extreme mechanical stresses with electrical safety parameters, making material selection and engineering design tolerances the decisive factor for reliable plant operation.
Xi'an Lite SIMO Motor Co., Ltd (LITESIMO) stands as a foundational enterprise within the Chinese mechanical industry, specializing in the design, development, and system supply of large and medium-sized, high and low voltage AC motors, DC motors, synchronous machines, and explosion-proof motors. As a fully integrated manufacturer, SIMO's core competencies stretch across mechanical design, advanced tooling fabrication, component casting, custom assembly, and precision diagnostic testing.
Founded in 1955, SIMO Motor has accumulated more than six decades of technical and operational experience. Today, the corporation operates out of a modernized manufacturing facility supported by a registered capital of 21.5 million RMB. Our production infrastructure spans three designated manufacturing divisions and one subsidiary plant, hosting a suite of 1,172 sets of high-precision heavy manufacturing machinery. SIMO maintains a workforce exceeding 1,200 employees, which includes 260 technical engineers, 21 senior engineers, and 15 industry-leading specialists.
SIMO Motor is established and led by local industrial planning authorities.
The operations relocate to a newly designed industrial facility in Xi'an City.
Officially named Xi'an Motor Factory after structured integration processes.
Transition from a state-owned enterprise to a limited liability corporation.
SIMO Motor Group is established, encompassing 14 specialized subsidiaries.
Operations transfer to a new high-tech manufacturing plant featuring automated processes.
Company transitions to Tech Full Simo Motor, optimizing global business operations.
Continuing global growth, leading high-efficiency and safety-critical motor advancements.
Procuring explosion-proof equipment for hazardous areas involves complex regulatory steps and engineering specifications. Large global enterprises prioritize quality control, international compliance, and long-term operating support when selecting manufacturing partners. SIMO satisfies these rigorous standards by integrating multiple international design and safety protocols into our standard production lines.
Global systems operate in environments ranging from sub-zero Arctic gas pipelines to high-humidity offshore marine platforms. Our Exe and Exd motor components undergo advanced sealing techniques, marine-grade epoxy coatings, and chemical-resistant insulation, yielding reliable protection against moisture, dust, and aggressive gas mixtures.
We systematically address regulatory barriers. LITESIMO maintains compliance protocols including the European CE mark, North American UL certifications, Russian GOST standards, and the Chinese domestic GB safety codes. This comprehensive certification suite helps reduce cross-border regulatory delays.
Unplanned downtime in a hazardous chemical plant can lead to significant financial losses. Our global support services assist operators through initial design consulting, mechanical alignment verification, on-site commissioning, and diagnostic field inspections.
LITESIMO designs drive systems rather than individual components. High-voltage and low-voltage electric motors must match the load profiles and dynamics of the driven equipment. Our systems are engineered to integrate with compressors, heavy ventilators, high-pressure water pumps, and bulk conveyors.
| Industry Sector | Typical Applications | Safety Requirements Met | Recommended SIMO Series |
|---|---|---|---|
| Petrochemical & Refining | Centrifugal pumps, reciprocating gas compressors, mixing vessels | ATEX / IECEx Zone 1 & Zone 2, Gas groups IIA, IIB, IIC, Class T3/T4 | YBX3, YBX4, YBX5 high-efficiency Ex motors |
| Mining & Minerals | Mine hoisting systems, coal crushing mills, ventilation fans | High mechanical load resistance, dust explosion proof (Group I / II) | YR, YRKK, YRKS wound rotor high-voltage motors |
| Power Generation & Utilities | Boiler feed pumps, draft fans, cooling tower circulating pumps | Continuous operation duty cycle, variable speed compatibility | YX, YXKK, YXKS series high-voltage efficiency motors |
| Heavy Processing Industries | Rolling mills, large industrial extruders, cement kilns | High startup torque, high speed control resolution | Z4 and Z series industrial DC motors, T / TD synchronous motors |
In application engineering, the interaction between the variable frequency drive (VFD) and the motor is a key design factor. LITESIMO's engineering team coordinates winding insulation parameters with the high voltage rate-of-rise (dV/dt) produced by modern IGBT frequency converters. Our YVFE3, YVFE4, and YVFE5 variable frequency and variable speed systems utilize reinforced corona-resistant insulation systems to prevent premature dielectric failure.
The development of industrial electric machinery centers on two priorities: maximizing energy efficiency and integrating digital diagnostics. Modern international regulations demand compliance with high efficiency standards. By developing IE4 and IE5 level ultra-premium efficiency asynchronous drive lines (such as the YE4 and YE5 series), LITESIMO helps operators reduce electric energy consumption while maintaining low operating temperatures, which is a key requirement for Exe safety compliance.
Our ongoing research and development roadmap focuses on the following primary areas:
We integrate real-time copper winding temperature tracking and bearing vibration sensors. By embedding RTD and PTC sensors directly into the stator core during assembly, our systems provide continuous diagnostics to control rooms, preventing thermal overload conditions before they trigger hazard shutdowns.
Through the use of cold-rolled non-oriented silicon steel sheets, we minimize core losses and eddy currents. This metallurgical control ensures the motor operates with minimal temperature rise under fluctuating loads, helping maintain safety margins in Zone 2 atmospheres.
For operations requiring high torque at low speeds, we are expanding our large-scale synchronous generator and motor applications. By eliminating intermediate mechanical gearboxes, we reduce mechanical losses and remove friction surfaces that could present ignition hazards.
LITESIMO maintains compliance protocols verified by international standards. Our manufacturing divisions operate under the strict guidelines of the ISO9001 Quality Management System. Our industrial motors carry certifications including CE for the European Economic Area, UL for North America, GOST for Russian and Commonwealth markets, and China's domestic Ex standards.
To support global projects, LITESIMO maintains a structured supply chain. From the selection of raw materials to the machining of heavy steel rotor shafts, each process is documented and traceable. When field commissioning requires specialized supervision, our technical team provides on-site alignment, vibration baseline recording, and startup verification to help operators satisfy local health and safety regulations.
SIMO's Quality Assurance framework is backed by international testing bodies, certifying performance and safety in demanding operating conditions.
The primary difference lies in the safety design concept. An Exd (Flameproof) motor is designed to contain an internal explosion. Its heavy enclosure is built to withstand pressure without rupture and prevent hot gases from escaping into the external environment. In contrast, an Exe (Increased Safety) motor focuses on prevention. It uses tight design tolerances, high-grade insulation, and temperature control to ensure no internal arcs, sparks, or hot surfaces occur during standard operation and startup. This makes Exe motors lighter and more compact than Exd models, though they require precise control systems.
The thermal limit time (tE) is the time required for rotor or stator windings to heat from their maximum operating temperature to their limit temperature under locked-rotor current conditions. LITESIMO's engineering team calculates this limit through computer simulation and verifies it during full-load testing. The motor's protection system must disconnect the machine from the electrical supply within the specified tE limit to prevent hazardous surface temperatures.
Yes, but they must be specifically rated for VFD operation. Variable Frequency Drives generate high-frequency voltage spikes (dV/dt) that can degrade standard winding insulation. LITESIMO's VFD-compatible motors, such as the YVFE3 and YVFE4 series, utilize corona-resistant magnet wire, reinforced phase insulation, and insulated non-drive-end bearings to prevent electrical discharge damage.
Mining operations require equipment certified under Group I (coal mining with methane/dust hazards) with high mechanical impact resistance. Chemical processing plants fall under Group II (surface industries with gas or dust hazards), categorized into Gas Groups IIA, IIB, or IIC and Temperature Classes T1 to T6. LITESIMO manufactures motors certified for both Group I (Mining) and Group II (Industrial) classes, complying with IECEx, ATEX, and GOST protocols.
Explore our high-voltage motors, soft-start solutions, and DC drive systems for heavy industrial operations.
LITESIMO's quality assurance framework is integrated into all production stages. For heavy equipment operated in explosive gas or combustible dust areas, material integrity is essential. We select premium electromagnetic steel sheet stock and high-grade copper bars to minimize electrical and mechanical failure risks. Stator coils undergo vacuum-pressure impregnation (VPI) with solventless resins to achieve insulation properties that meet Class F and Class H standards.
Each motor is tested at our facility prior to shipment. Tests cover winding resistance measurements, load performance verification, dynamic balance checks, sound power measurement, and overspeed testing. We supply full trace documentation, certificate compliance records, and parameter test sheets to simplify integration into project management systems.
Lite Simo
