Engineered explosion-proof configurations and advanced motor drive systems for process industries.
Founded in 1955, Xi’an Lite SIMO Motor Co., Ltd is an electric company and a main enterprise specializing in the manufacturing of large/medium-sized, high/low voltage AC motors, DC motors, synchronous motors, and explosion-proof motors in the Chinese mechanical industry. SIMO stands as a comprehensive manufacturing and service supplier covering motor design, manufacturing, mechanical processing, mold making, and full-scale assembling. The company ranks TOP in China's motor industry regarding production scale and has maintained a rapid development trend for consecutive decades.
A comprehensive overview of engineering parameters, hazardous classifications, and safety principles.
In hazardous environments, an "Increased Safety" (Ex eb/ec) motor plays a crucial role in preventing explosions. Unlike flameproof (Ex db) motors that are designed to withstand an internal explosion without propagating it to the outside atmosphere, increased safety motors focus on preventing any ignition sources from developing in the first place.
This is achieved by implementing strict design protocols that eliminate the occurrence of electrical arcs, sparks, and hot surfaces on all internal and external parts of the machine during standard operation and under specific overload scenarios.
By using premium copper windings and optimizing slot geometry, we reduce electric stresses. Advanced insulation coating minimizes winding dielectric breakdown, maintaining total system integrity even under extreme fluctuating voltages.
Increased safety motors must maintain low surface temperatures. Thermal design involves calculating worst-case scenarios (tE time), ensuring the stator and rotor do not reach the auto-ignition temperature of surrounding gases.
High-precision machining of stator cores and rotor shafts prevents mechanical rubbing. By utilizing strict concentricity controls, the mechanical clearance remains consistent under all dynamic loading conditions.
Industrial procurement teams must evaluate multiple protection topologies based on ambient gas groups (Group IIA, IIB, IIC) and dust configurations (Group IIIA, IIIB, IIIC). The following guide explains these differences:
| Protection Type | IEC/EN Standards | Core Method of Protection | Suitable Hazard Zones |
|---|---|---|---|
| Increased Safety (Ex eb) | IEC 60079-7 | Prevents sparks, arcs, and high temperatures by upgrading component design. | Zone 1, Zone 2 |
| Flameproof (Ex db) | IEC 60079-1 | Contains internal explosions and cools escaping gases to prevent ignition. | Zone 1, Zone 2 |
| Increased Safety (Ex ec / Ex nA) | IEC 60079-7 / -15 | Basic prevention of sparking during normal operation for non-sparking machines. | Zone 2 only |
| Dust Ignition Protection (Ex tb/tc) | IEC 60079-31 | Enclosure IP rating prevents combustible dust ingress (e.g. coal, flour, chemical powders). | Zone 21, Zone 22 |
More than 60 years of technical innovation and growth in large-scale motor manufacturing.
SIMO Motor was established and led by the government to support industrial growth.
Relocated to a new dedicated plant in Xi'an city to expand manufacturing capabilities.
Renamed to Xi'an Motor Factory following strategic acquisitions and integration.
Reformed into a limited liability company from a state-owned enterprise.
SIMO Motor Group established, growing to incorporate 14 specialized subsidiaries.
Moved to a state-of-the-art facility equipped with modern machining lines.
Officially renamed to Tech Full Simo Motor to reflect our high-tech engineering focus.
Continuing to innovate as one of the best high-voltage and safety motor manufacturers globally.
Aligning safety motor configurations with international operating criteria and harsh ambient profiles.
Large-scale industrial procurement demands strict adherence to performance profiles and operating characteristics. Global engineering, procurement, and construction (EPC) companies require safety motors that satisfy diverse specifications, including:
Seamless validation across ATEX (Europe), IECEx (Global), UL (North America), and GOST (Russia). Procurement departments require unified testing procedures to minimize localized regulatory friction.
Ability to operate in ambient temperatures from -40°C to +60°C. Motors require IP55 to IP66 ingress protection ratings to counter dust storms, sea spray, and chemical run-offs.
Demand for IE4 and IE5 (YE4/YE5) high-efficiency series asynchronous motors to reduce operational expenditures and align with corporate carbon reduction initiatives.
We supply a wide range of motors, encompassing 34 major series, over 1,800 varieties, and 19,500 individual specifications. Output ranges span from 0.35 kW to 25,000 kW.
| Motor Series Class | Model Series Codes | Voltage & Configuration | Target Industrial Application |
|---|---|---|---|
| High Efficiency Asynchronous | YE3, YE4, YE5 Series | Low Voltage, Ultra Premium | General machinery, pumps, industrial ventilation fans. |
| High Voltage High Efficiency | YX, YXKK, YXKS Series | High Voltage, 6kV, 10kV | Water conservancy projects, large compressors, municipal water works. |
| Wound Rotor High Voltage | YR, YRKK, YRKS Series | Slip-Ring Heavy-Duty Start | Heavy-load grinding mills, steel mills, crushing machines. |
| Explosion-Proof / Ex Safety | YBX3, YBX4, YBX5, YFB4, YBK3 | Low/High Voltage Ex d & Ex e | Petroleum refineries, offshore rigs, underground coal mines. |
| Synchronous Motors | T, TD, TK, TDMK, TFW Series | Large scale, up to 25,000 kW | Reciprocating compressors, large mills, industrial power plants. |
| DC Motors | Z2, Z4, Z Series | Medium / Large frame DC | Rubber extrusion, metal rolling mills, marine propulsion. |
The modernization of electric drivetrains focuses on safety, efficiency, and intelligence. SIMO Motor is developing smart diagnostic solutions that integrate seamlessly with plant control networks.
Explore some of our production and design setups:
Rigorous validation to maintain reliability and performance under demanding operating conditions.
Simo Motor has obtained ISO9001 Quality System Certification, EU "CE", US "UL", and Russian "GOST" certifications. Our electric motors are deployed globally in power generation, coal mining, petrochemicals, metallurgy, railways, chemical production, agriculture, water conservation, aviation, and marine systems.
Browse our core asynchronous, synchronous, and DC motor series optimized for modern plants.
Answers to common questions regarding design parameters, safety classifications, and lead times.
An Ex d (Flameproof) motor is designed to withstand internal explosions. Its heavy enclosure prevents internal flames or hot combustion gases from escaping into the external environment. In contrast, an Ex e (Increased Safety) motor focuses on prevention. It incorporates structural design modifications (such as high-grade winding insulation, controlled air gaps, and thermal monitoring) to prevent sparks, arcs, or excessive surface temperatures from occurring under all normal and specified overload conditions.
VFD operation can introduce high-frequency voltage spikes and increased harmonic heating within motor windings. SIMO's variable frequency motor series (such as the YVFE3 and YVFE4 lines) utilize Class H insulation, insulated non-drive end bearings to eliminate shaft currents, and external cooling fans to maintain safe winding temperatures even when running at low speeds with constant torque load profiles.
Petrochemical areas characterized by explosive dust require Ex tb (Zone 21) or Ex tc (Zone 22) certifications under the IEC 60079-31 standard. Our YFB4 dust explosion-proof series features IP65 sealing, dust-tight joint paths, and strict external surface temperature limiting to prevent dust ignition.
Large synchronous motors (like our T and TD series) or high-voltage wound rotor motors (such as the YR series) draw high starting currents. A high-voltage soft-starting cabinet manages this inrush current, reducing thermal and mechanical stress on the motor windings and the supply grid, which helps extend the operating lifespan of the entire system.
For custom high-voltage configurations (such as YKK or YKS series up to 25,000 kW), typical engineering and production lead times range from 8 to 16 weeks. This includes full mechanical layout modeling, electrical design verification, factory acceptance tests (FAT), and coordination of ATEX, CE, or GOST certifications.
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