Engineered for global reliability. Click below to view specifications, dimensional drawings, and certification options.
Three-phase asynchronous electric motors serve as the workhorses of the global manufacturing economy. Across municipal pump systems, metallurgy rollers, petrochemical compressors, and mining mills, the requirement for robust torque, operational efficiency, and long lifespan is paramount. As power grids adapt to more demanding sustainability frameworks, the choice of a three-phase motor is no longer just about horsepower—it is about system efficiency, thermal stability, and low lifecycle operational costs.
At Xi’an Lite SIMO Motor Co., Ltd., our engineering philosophy relies on over 60 years of R&D. By deploying advanced Class F vacuum pressure impregnation (VPI) insulation, optimized stator laminate geometries, and precision dynamic rotor balancing, we ensure our high-voltage and low-voltage motors operate in the most demanding conditions, providing exceptional power factors and reducing unexpected downtime.
Whether you require standard low-voltage IEC solutions like the YE5 Ultra Premium series or explosion-proof custom-built high-voltage units like the YBX5 series, SIMO Motor ensures compliance with the most stringent global standards, including UL, CE, and GOST.
Three-phase AC electric motors are configured to meet distinct mechanical loads, ambient atmospheres, and power characteristics across industrial sectors.
Applications like raw coal crushers, cement ball mills, and conveyor belts demand massive starting torque. Heavy-duty three-phase slip ring (wound rotor) motors like the YR/YRKK series provide external resistance starter compatibility to manage high-inertia startup sequences without thermal stress on the windings.
Flammable gases, volatile fumes, and heavy airborne combustible dust require specialized containment designs. SIMO’s YBX3, YBX4, and YBX5 explosion-proof series feature flameproof enclosures that prevent internal sparks or thermal surges from igniting surrounding external atmospheres.
Pumps and fans demand continuous (S1 duty) cycles. Variable speed regulation is essential to conserve energy under shifting system pressures. Variable Frequency Drive (VFD) three-phase asynchronous motors like the YVFE3, paired with custom high-voltage soft start cabinets, eliminate line pressure spikes.
Our origin goes back to 1955, at the beginning of China's heavy industrial modernization. Over the decades, Xi’an Lite SIMO Motor Co., Ltd. has developed from a local state-owned workshop into a premier industrial manufacturing group. Today, the corporation manages a comprehensive campus characterized by high-tech manufacturing, testing laboratories, and precision machining lines.
With a registered capital of 21.5 million RMB, fixed assets valued at 380 million RMB, and a footprint that encompasses 3 main manufacturing facilities and a specialized subsidiary plant, SIMO is built for scale. Our manufacturing floor holds over 1,172 sets of advanced industrial machinery, from vacuum impregnators and automated winding tools to dynamic balance analyzers and comprehensive high-voltage testing beds.
Human capital is the cornerstone of our engineering expertise. Our team of 1,200+ professionals includes a dedicated force of 260+ technical engineers, 21 senior engineers, and 15 state-level expert engineers who steer our national research programs and structural designs.
A history of industrial capability spanning over half a century.
SIMO Motor is established under state guidance, forming the core base for heavy AC/DC motor production in northwest China.
Expanded manufacturing capacity and officially integrated regional engineering assets under the name Xi'an Motor Factory.
Reformed into a modern joint-stock company, introducing computerized design tools, CNC machinery, and high-efficiency product lines.
Relocated to a modern high-tech industrial park, integrating heavy crane capability, advanced dynamic balancing, and VPI systems.
Advancing motor development with ultra-premium IE4/IE5 efficiency ranges, explosion-proof motors, and digital IoT temperature/vibration sensors.
Three-phase asynchronous induction motors function via electromagnetic induction, where a rotating magnetic field (RMF) generated by the stator windings induces currents in the rotor bars. The interaction between this RMF and the rotor current generates rotational torque. To optimize this process, several engineering aspects must be fine-tuned:
The stator core is composed of insulated, cold-rolled non-oriented silicon steel laminations. By using high-quality steel (with low core loss characteristics), hysteresis and eddy current losses are minimized. Copper wire purity remains critical; we utilize double-enameled copper wire with Class H rating to ensure the coils can withstand transient over-voltages and operational heat without insulation breakdown.
Moisture, chemicals, and mechanical vibrations are major causes of stator winding insulation failure. The entire stator assembly undergoes a rigorous Vacuum Pressure Impregnation (VPI) process. Under vacuum, air pockets are removed from the windings; subsequently, solventless resin is introduced under high pressure. When cured, this forms a solid, void-free matrix that improves heat dissipation, enhances structural strength, and keeps out contaminants.
Vibration in large high-voltage motors (such as the YRKK or YKS series) can accelerate bearing wear, cause shaft fatigue, and lead to noise pollution. Rotors are dynamically balanced to ISO 1940 standards (precision G1.0 or G2.5 grades). Shafts are forged from premium carbon steel (45# or 40Cr), then ground to fine tolerances to support heavy mechanical loads.
Understanding the standard specs of typical three-phase AC induction motors helps procurement teams match machinery requirements with long-term cost benefits.
| Motor Series Group | Standard Power Range (kW) | Voltage Options (V) | Efficiency Class | Common Industrial Applications |
|---|---|---|---|---|
| YE3, YE4, YE5 | 0.35 kW – 375 kW | 380V / 400V / 415V / 660V | IE3 Premium to IE5 Ultra-Premium | Continuous duty fans, conveyors, compressors, standard pumps |
| YXKK, YKS (High Voltage) | 185 kW – 25,000 kW | 6,000V (6kV) / 10,000V (10kV) | High-Efficiency Asynchronous | Mining ventilation fans, water utility pumps, steel industry crushers |
| YBX3, YBX4, YBX5 | 0.55 kW – 1,000 kW | 380V / 660V / 1140V / 6kV | Explosion-Proof (Ex d IIBT4 / IIC) | Petrochemical pumps, offshore drilling platforms, coal mines |
| YR, YRKK, YRKS | 160 kW – 15,000 kW | 380V / 6kV / 10kV | Slip-Ring (Wound Rotor) type | High-torque mining mills, cement kiln drives, heavy crushers |
| YVFE3, YVFE4 | 0.55 kW – 2,000 kW | 380V / 660V / 6kV | Variable Frequency Drive (VFD) compatible | Dynamic control fans, rolling mills, complex automated lines |
SIMO motors undergo testing and certification protocols to ensure compliance with global engineering codes.
Our products are certified by international organizations, ensuring they meet energy efficiency, environmental safety, and operating criteria across major industrial markets.
The global motor manufacturing landscape is experiencing a transition driven by digitalization and environmental regulations. Our engineering roadmap addresses several key shifts:
Purchasing heavy three-phase industrial motors requires careful attention to transport security, documentation, and mechanical alignment upon arrival. SIMO Motor supports global buyers with:
Technical answers to support your engineering and procurement decisions.
A: A squirrel cage induction motor uses solid conductor bars short-circuited by end rings, offering a robust and virtually maintenance-free design suited for general industrial applications. A wound rotor (slip ring) motor (e.g., YR/YRKK series) features three-phase insulated windings connected through slip rings and carbon brushes to external resistance. This allows you to add resistance during startup to limit inrush current while achieving high starting torque. It is ideal for high-inertia loads like large ball mills and crushers.
A: High-voltage motors are typical for power requirements exceeding 200 kW. By using a higher operating voltage, the current draw decreases proportionally. This reduces copper wire dimensions, minimizes heat losses in cables, and simplifies electrical control switchgear. It is suitable for heavy-duty pumps, large fans, and compressors in mines and petrochemical facilities.
A: Variable Frequency Drives (VFDs) use high-frequency pulse-width modulation (PWM) to control speed. These fast-switching pulses can cause high-frequency voltage spikes, stressing the insulation and inducing shaft currents that can damage bearings. SIMO’s YVFE3 and variable-speed AC series utilize reinforced Class F corona-resistant insulation systems, insulated bearings at the non-drive end, and optional grounding brushes to route shaft currents safely away from the bearings.
A: Explosion-proof environments require formal certification. Standard low-voltage or high-voltage motors are not safe for these areas. SIMO’s YBX3, YBX4, and YBX5 explosion-proof series are certified under ATEX, IECEx, and GB (China) standards, classified as Ex d IIB or IIC T4, ensuring they can contain internal explosions without igniting gases in the surrounding environment.
A: Our standard motors come with IP54 or IP55 protection (enclosed against dust and splashing water), with optional upgrades to IP56 or IP65. Cooling methods conform to international standards, including IC411 (totally enclosed fan-cooled - TEFC), IC611 (air-to-air heat exchanger), and IC81W (water-cooled), depending on the thermal and environmental requirements of the application.
Engineered for global reliability. Click below to view specifications, dimensional drawings, and certification options.
Lite Simo
