Explore our primary range of explosion-proof, variable frequency, high-voltage, and custom synchronous electric motors manufactured to global engineering standards.
In the heavy-duty industrial landscape, Totally Enclosed Fan Cooled (TEFC) squirrel cage induction motors represent the cornerstone of dependable mechanical power transmission.
As engineering standards shift globally towards higher efficiency metrics, such as the IEC IE3, IE4, and IE5 standards, industrial facilities must carefully choose their rotating electrical machinery to guarantee maximum uptime, thermal efficiency, and safety. A TEFC (Totally Enclosed Fan Cooled) motor is specifically engineered to operate under demanding environmental conditions. The internal components are completely isolated from external dust, moisture, and corrosive atmospheres, preventing failure mechanisms that commonly plague open drip-proof (ODP) designs.
At Xi’an Lite SIMO Motor Co., Ltd. (LITESIMO), we combine over 68 years of heavy industrial manufacturing expertise with cutting-edge engineering processes. We produce squirrel cage induction motors that solve the most complex drive challenges in mining, municipal water pumping, chemical manufacturing, power generation, and metallurgical refining. By leveraging precision balance rotors, custom copper cage constructions, and advanced vacuum pressure impregnation (VPI) insulation, LITESIMO delivers TEFC motor solutions that maximize system reliability while lowering the Total Cost of Ownership (TCO).
A Totally Enclosed Fan Cooled (TEFC) squirrel cage motor features an enclosed frame (preventing free exchange of air between the inside and outside of the case) with an external fan attached to the shaft. The fan blows air over the frame's cooling fins to dissipate heat. The rotor consists of conductive bars arranged in a cylinder, resembling a squirrel cage, which interact with the stator's electromagnetic field to generate mechanical torque without slip rings or carbon brushes.
Technological innovations in materials science and electronics are shaping the future of TEFC induction machinery.
To meet international climate agreements, our technical roadmap targets standardizing IE5 and developing IE6 ultra-premium efficiency profiles. We minimize electromagnetic loss by utilizing thin-gauge laminated silicon steel cores, optimizing stator slot geometries, and reducing stray load losses through advanced copper rotor casting techniques.
Integrating micro-sensor arrays directly into TEFC motor frames allows for real-time condition monitoring. These integrated systems measure winding temperatures, vibration levels, and stator current harmonics. These variables feed directly into industrial SCADA and cloud-based predictive maintenance systems to forecast bearing failures and prevent unplanned shutdowns.
Through computational fluid dynamics (CFD) optimization of the external cooling fan and housing fins, we maximize heat dissipation while minimizing aerodynamic drag and acoustic emissions. Novel insulation systems containing nanostructured resins are being integrated to handle thermal stress under VFD drive control.
Xi’an Lite SIMO Motor Co., Ltd. (established in 1955) is an electric company and a key manufacturing enterprise specializing in the production of large and medium-sized, high/low voltage AC motors, DC motors, synchronous motors, and explosion-proof motors within the Chinese mechanical industry. Over the course of nearly 70 years, SIMO has grown to rank at the top of China's electrical machinery sector, operating as a comprehensive supplier of motor design, mechanical processing, mold fabrication, assembly, and testing services.
LITESIMO maintains continuous production growth by investing in advanced tooling and engineering talent. Today, the corporation features a registered capital of 21.5 million RMB, operates 3 manufacturing plants and 1 subsidiary factory, holds fixed assets of 380 million RMB, and maintains more than 1,172 sets of advanced industrial production equipment. The workforce comprises over 1,200 employees, including more than 260 technical engineers, 21 senior engineers, and 15 expert engineers.
SIMO Motor is established and led by the state government, targeting baseline industrial motor supply.
The factory relocates to its new industrial site in Xi'an city, scaling up production capacity.
The facility is renamed Xi'an Motor Factory following strategic mergers and acquisitions.
Reformed from a state-owned enterprise into a modern limited liability company.
SIMO Motor Group is established, encompassing 14 specialized subsidiaries.
The main operations move to a high-tech and advanced new manufacturing facility.
Rebranded as Tech Full Simo Motor, optimizing global distribution networks.
Consolidating its position as a top motor manufacturer, supplying energy-efficient motors globally.
LITESIMO motors are designed to operate under harsh, high-load conditions across key global infrastructure sectors.
Mining sites present challenges such as abrasive dust, heavy vibration, and high ambient temperatures. Our custom TDMK series AC synchronous motors and high-voltage wound rotor induction systems (YR, YRKK, YRKS) provide the high startup torque required by ball mills, sag mills, jaw crushers, and heavy conveyor belts.
Additionally, the YBK3 series flameproof squirrel cage motors are specifically certified for underground coal mining, ensuring safety in atmospheres containing methane and coal dust.
In chemical refineries and petroleum processing plants, explosive gases represent a constant hazard. LITESIMO's line of YBX3, YBX4, and YBX5 explosion-proof low and high-voltage motors feature cast-iron frames designed to contain internal ignition, preventing flammable gases from exploding in the surrounding environment. These TEFC motors are used for high-pressure pumps, compressors, and ventilation fans.
Water transport systems require continuous operation from high-power pump motors. Our YXKS and YKS high-voltage water-cooled motors and YE3/YE4/YE5 TEFC motors deliver high reliability and efficiency. By pairing these motors with YVFE3 or YVFE4 variable-frequency drive systems, water plants can adjust flow rates dynamically, reducing energy usage and thermal strain on the windings.
High temperatures and airborne particulate matter are common in steel mills. LITESIMO’s large-scale DC motors (Z2, Z4, and Z series) and synchronous motors are built to withstand rapid load reversals and constant thermal cycling. The robust frame designs protect internal components from metallic dust, reducing winding insulation failure.
LITESIMO leverages advanced manufacturing technologies to provide high-quality motors at scale.
Operating from Xi'an, LITESIMO's manufacturing facilities feature automated production lines, CNC machining centers, and comprehensive test beds. Our integration of Factory 4.0 principles begins with raw material selection. We use high-purity electrolytic copper for stator windings and low-loss silicon steel sheets to reduce electromagnetic losses, ensuring each motor meets energy efficiency standards.
Our manufacturing processes include:
By managing casting, winding, machining, assembly, and testing in-house, LITESIMO ensures consistent quality control. Our supply chain configuration allows us to maintain stable production lead times and secure raw materials even during market volatility, offering global clients a reliable sourcing partnership.
LITESIMO's high-power test laboratory can conduct full-load testing on motors up to 25,000 kW, validating performance criteria such as torque curves, efficiency values, heat rise, and noise levels before shipping.
When sourcing heavy industrial TEFC motors, engineers and procurement managers must evaluate several technical criteria to ensure long-term compatibility.
| Motor Series | Voltage Range | Power Range (kW) | Cooling Class | Primary Industrial Applications |
|---|---|---|---|---|
| YX / YXKK / YXKS | 6kV, 10kV (HV) | 220 – 25,000 | IC411 / IC611 / IC81W | Power station fans, water pumps, compressors, steel rolling mills |
| YR / YRKK / YRKS | 380V to 10kV | 160 – 20,000 | IC411 / IC611 / IC81W | Wound rotor for heavy-start ball mills, crushers, winch systems |
| YE3 / YE4 / YE5 | 380V, 660V (LV) | 0.75 – 1,000 | IC411 (TEFC) | General machinery, blowers, chemical pumps, packaging systems |
| YVFE3 / YVFE4 / YVFE5 | 380V to 10kV | 0.55 – 10,000 | IC416 (TEFV) / IC411 | VFD-driven speed regulating systems, textile mills, paper mills |
| YBX3 / YBX4 / YBX5 | 380V to 10kV | 0.55 – 4,000 | IC411 (Explosion Proof) | Hazardous environments, coal mines, oil refineries, chemical reactors |
| TDMK / T / TD / TK | 3kV, 6kV, 10kV | 200 – 25,000 | Custom / IC01 / IC37 | Heavy synchronous mining ball mills, cement mills, large compressors |
| Z2 / Z4 / Z Series | Standard DC Voltages | 0.75 – 2,000 | IC01 / IC06 / IC17 / IC37 | Extruders, paper mills, metallurgy rolling mills, marine propulsion |
To ensure correct motor selection, engineering teams should evaluate the following factors:
LITESIMO motors comply with major international engineering standards to support seamless integration into global projects.
To support international engineering companies (EPCs) and operators, LITESIMO maintains certifications from global standards organizations. We have implemented an ISO 9001 quality management system covering design, manufacturing, material sourcing, and testing.
Our products conform to the following standards:
In addition to compliance certification, LITESIMO provides field service engineering support. Our technical team assists with installation, commissioning, vibration analysis, and warranty support worldwide, helping to ensure smooth motor integration and operation.
Common technical questions regarding the installation, maintenance, and specification of heavy industrial TEFC and squirrel cage induction motors.
TEFC (Totally Enclosed Fan Cooled) motors isolate internal components from the surrounding atmosphere, using an external shaft fan to blow air across the frame's cooling fins. They are suitable for dusty, wet, and corrosive environments. ODP (Open Drip Proof) motors allow ambient air to flow directly through the windings for cooling. While ODP motors are typically more cost-effective per kilowatt, they are restricted to clean, dry, indoor environments to prevent winding contamination.
VFDs control motor speed by switching voltage on and off rapidly, which can generate high-voltage spikes (reflected waves) that stress winding insulation. LITESIMO VFD-duty motors feature phase insulation, corona-resistant magnet wire, and class F or H insulation to withstand these voltage spikes. Additionally, running at low speeds reduces the cooling air flow from the shaft-mounted fan, which may require a blower for external force ventilation (TEFV/IC416 cooling).
Synchronous motors (like the TDMK or T series) are typically selected for large, low-speed applications (such as mining ball mills or reciprocating compressors) where power factor correction is required. Synchronous motors operate at a constant speed regardless of load variations and can run at a leading power factor, helping to improve the overall power factor of the plant electrical system.
Excessive vibration causes mechanical stress that accelerates bearing wear, damages winding insulation, and can lead to shaft fatigue. LITESIMO dynamic balancing limits residual unbalance to levels below ISO G1.0/G2.5, helping to extend the operating life of bearings and mechanical couplings.
Explosion-proof motors (such as the YBX3, YBX4, and YBX5 series) must be housed in frames designed to withstand an internal gas explosion without allowing the flame to ignite gases or dust in the surrounding atmosphere. These motors are certified to Ex d, Ex e, or Ex nA standards under ATEX, IECEx, or local standards like GB and GOST.
We manufacture a wide range of motor configurations, including synchronous models, wound rotor systems, high-voltage induction machines, and medium-to-large DC motors.
Lite Simo
