Explore our high-efficiency, multi-phase electrical machinery designed for heavy-duty industrial drives and custom utility configurations.
Xi’an Lite SIMO Motor Co., Ltd is an electric company, and a core enterprise specializing in the manufacturing of large/medium-sized, high/low voltage AC motors, DC motors, synchronous motors, and explosion-proof motors within the Chinese mechanical engineering industry. As a comprehensive manufacturing and service supplier, SIMO integrates motor design, machining, mold making, assembly, and rigorous system testing under one roof.
The company ranks TOP in China’s motor manufacturing sector concerning production scale, technological innovation, and engineering range. By continuously leveraging advanced electromagnetic simulation and design systems, SIMO has sustained a fast-growing trend, building an unmatched reputation for supplying rugged, high-performing induction machinery to demanding industries worldwide.
A closer look at the key metrics powering our high-voltage and low-voltage electrical machinery manufacturing facilities.
Understanding the design paradigms, structural features, and mechanical behaviors that define modern squirrel cage induction motors.
The squirrel cage asynchronous motor is the most widely adopted electro-mechanical driver in modern industrial production. Its name derives from the rotor construction, which resembles a rotating cage of conductive bars short-circuited by end rings. Designed to operate on the principle of electromagnetic induction, these motors utilize a three-phase stator winding that generates a rotating magnetic field (RMF). The difference in speed between the rotating magnetic field and the physical rotor—known as the slip—induces electromotive force (EMF) and current in the rotor bars, creating mechanical torque.
The robustness of a squirrel cage motor depends entirely on its design engineering. At SIMO, we build motors using premium grade raw materials and advanced simulation technologies:
Laminated high-permeability, low-loss silicon steel sheets reduce eddy currents. Precision slot tooling ensures high winding copper fill factor, maximizing motor efficiency and torque output.
High-pressure aluminum die-cast or copper-bar rotors reduce internal resistance. Every rotor undergoes precise dynamic balancing to satisfy the ISO 1940-1 G1.0/G2.5 balance grades.
Class F or Class H insulation systems utilize Vacuum Pressure Impregnation (VPI) with solvent-free epoxy resins. This offers superior dielectric strength and moisture resistance.
For large-scale industrial projects, off-the-shelf motors often fall short of mechanical and thermal boundary conditions. An OEM (Original Equipment Manufacturer) approach ensures that factors such as the starting torque ratio, moment of inertia (J), and thermal starting limits are carefully engineered. By working directly with SIMO Motor, global procurement teams and plant engineers can request custom shaft extensions, tailored mounting configurations (foot, flange, or vertical), and specialized terminal box entries that integrate seamlessly with existing legacy systems.
Tracing the development and technological progress of Xi'an SIMO Motor from its origins in 1955 to a global brand.
SIMO Motor was established and led by the local government, forming the foundation of modern high-voltage electrical machinery manufacturing in northwestern China.
The company relocated to its primary facility in Xi'an city, establishing the mechanical tooling, coil winding, and rotor casting shops.
Formally renamed to Xi'an Motor Factory after undergoing a series of successful state acquisitions and strategic integrations.
Successfully reformed from a state-owned factory into a limited liability company, introducing private R&D investments and market-oriented operations.
SIMO Motor Group was officially established, managing 14 specialized subsidiaries covering material supply, machinery fabrication, and technical services.
Relocated to a modern, high-tech industrial park equipped with advanced state-of-the-art winding, insulating, and testing systems.
Rebranded to Tech Full Simo Motor, aligning corporate operations, supply chain logistics, and quality assurance with Western industrial expectations.
Ranked as one of the best motor manufacturers globally, continuously optimizing YKS, YE5, and YBX5 series to meet the transition to premium high-efficiency standards.
SIMO offers a broad range of standard and specialized electric motors engineered for all types of industrial workloads.
With registered capital of 21.5 million RMB, fixed assets exceeding 380 million RMB, and more than 1,172 sets of advanced equipment, our R&D is geared toward highly specialized systems. Our catalog covers 34 major series, comprising over 1,800 varieties, and upwards of 19,500 individual specifications. Our power range scales from 0.35 kW up to 25,000 kW.
Including the YX, YXKK, and YXKS series high-voltage, high-efficiency three-phase asynchronous motors, and the YR, YRKK, and YRKS wound rotor series. These units are built to operate reliably at 3kV, 6kV, or 10kV configurations.
Designed to comply with international energy classes, featuring the YE3, YE4, and YE5 ultra-premium efficiency asynchronous motors, as well as the YVFE3, YVFE4, and YVFE5 variable frequency adjustable-speed motors.
Targeting explosive environments with our YBX3, YBX4, and YBX5 explosion-proof low/high-voltage three-phase asynchronous motors, as well as specialized TDMK synchronous motors for mine milling and underground grinding mills.
How different geographic and climatic regions configure SIMO motors to survive extreme conditions and meet local operational mandates.
Mining operations require motors that can withstand sub-zero cold starts, high vibration, and abrasive dust. In these environments, SIMO's TDMK and YKS series are configured with space heaters to prevent condensation in the stator core when deactivated. Combined with heavy-duty roller bearings (SKF or FAG) and grease piping systems, these motors deliver reliable torque to jaw crushers and slurry pumps in remote areas.
With temperatures exceeding 50°C, cooling efficiency and explosion protection are critical. SIMO's YBX5 series totally enclosed fan cooled (TEFC) and explosion-proof motors use custom cast-iron frames designed for optimal air flow. Specialized flameproof enclosures contain internal arcs, preventing ignition in hazardous zone 1 and zone 2 environments.
Large municipal water pumping stations require continuous operation with low energy consumption. SIMO’s YE5 (IE5 Ultra Premium Efficiency) squirrel cage motors operate in combination with variable frequency drives (VFDs) to match supply network demand. Insulated non-drive end bearings prevent electrical erosion from high-frequency shaft currents.
Anticipating the technological shifts in electrical machinery design, magnetic materials, and environmental efficiency regulations.
Global regulatory bodies are pushing requirements past IE4. SIMO's engineering team is optimizing the rotor slot geometry and stator laminations to minimize load losses, positioning our squirrel cage motors at the forefront of the green industrial transition.
Integrating vibration accelerometers, RTD temperature sensors, and flux coils within the motor housing allows operators to monitor performance in real time, shifting maintenance strategies from reactive to predictive.
As VFD drive setups become standard, stator winding insulation must resist steep wave-front voltage surges (dV/dt). SIMO is developing dual-coat corona-resistant enameled wires and reinforced phase insulation to extend service life.
How SIMO's integrated production ecosystem ensures stable pricing, high material quality, and dependable delivery timelines.
Industrial procurement is heavily impacted by supply chain volatility, metal price fluctuations, and transit times. Operating out of our advanced plant in Xi'an, China, SIMO Motor mitigates these risks through strategic supply agreements and deep vertical integration. By handling structural steel casting, coil winding, rotor casting, shaft machining, and vacuum pressure impregnation in-house, we eliminate reliance on third-party fabricators. This setup protects our production schedules from external delays and guarantees consistent quality control at every stage of assembly.
Furthermore, our proximity to raw material hubs for high-grade copper and electrical steel reduces logistics costs, allowing us to offer highly competitive pricing. With 3 production facilities and over 260 technical engineers on site, SIMO can easily balance custom production runs with high-volume OEM contracts, maintaining short lead times even during peak global demand.
SIMO motors are certified by international standards bodies, ensuring easy customs clearance and hassle-free commissioning on site.
To meet the strict import requirements of different regions, SIMO has achieved compliance with ISO9001 Quality System Certification, European Union "CE", United States "UL", and Russian Federation "GOST". This certification portfolio qualifies our motors for use in highly regulated sectors worldwide, including offshore oil platforms, underground coal mines, and public utility projects.
Answers to common questions regarding the installation, efficiency, and customization of squirrel cage induction motors.
In standard squirrel cage designs, direct-on-line (DOL) starting draws a high starting current (typically 5 to 7 times the rated current) while producing a starting torque of about 1.5 to 2.2 times the full-load torque. At SIMO, we can adjust rotor slot geometries (such as using deep rotor bars or double squirrel cage configurations) to increase starting torque while limiting inrush currents.
YE4 (IE4) and YE5 (IE5) motors minimize stator copper losses, rotor aluminum/copper losses, and core losses through the use of high-grade silicon steel laminations and optimized windings. In 24/7 applications, a 1% to 2% efficiency gain can recover the initial cost of the motor in energy savings within the first 12 to 18 months of operation.
Standard motors are rated for operation up to 1,000 meters above sea level. At higher altitudes, the thinner air reduces cooling efficiency. To compensate for this, SIMO engineers can either supply a larger frame size (derating the motor), use Class H insulation with Class F temperature rises, or upgrade the cooling fan to maintain safe operating temperatures.
VPI eliminates air pockets within the stator slots, securing the windings against mechanical vibration and improving thermal conductivity. In explosion-proof applications, VPI ensures the winding assembly remains sealed against moisture, dust, and corrosive vapors, protecting the unit against internal electrical faults.
For low-voltage motors, we generally use sealed-for-life or open ball bearings from SKF, NSK, or FAG. For large, high-voltage motors, we utilize heavy-duty roller bearings or sleeve bearings. Re-lubrication intervals depend on speed and operating temperature, typically ranging from 2,000 to 8,000 operating hours. These details are clearly specified on the motor’s nameplate.
Yes. When driven by VFDs, high-frequency common-mode voltages can induce shaft currents that damage bearing raceways. For motors with frame sizes 280 and above, SIMO installs insulated non-drive end (NDE) bearings or shaft grounding brushes to protect the bearings from electrical discharge erosion.
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