Explore our top-tier manufacturing line of low-voltage, high-voltage, and explosion-proof synchronous and asynchronous electric motors tailored for demanding global environments.
Modern heavy manufacturing, oil extraction, mining, and power generation continuously push the operational envelopes of mechanical systems. At the heart of these facilities lie large-scale electric motors. As output demands intensify, traditional air cooling (IC01, IC411) and water jacket cooling (IC71W) systems face severe spatial and thermal limitations. Oil cooled electric motor architectures represent a massive leap forward in thermal management technology, replacing air or water with specialized dielectric fluid circulating directly through or around critical heat-producing components.
By directly contacting the stator windings, end turns, and rotor configurations with oil, manufacturers can achieve significantly higher heat transfer coefficients. Heat is carried away up to 10 times more efficiently than air. This enables a drastic reduction in motor size, eliminating the massive external heat exchangers and cooling fans that occupy critical space in underground mines, offshore drilling platforms, and marine vessels.
From an procurement and operational standpoint, the industry demands access to discount oil cooled electric motor manufacturers who can scale production while conforming to high international standards (IEC, NEMA, IEEE). Xi'an Lite SIMO Motor Co., Ltd. fills this global need by combining state-of-the-art Chinese manufacturing efficiencies with high-end R&D expertise gained over more than six decades of specialized development.
Direct oil contact eliminates the air gap thermal resistance, facilitating up to 35% higher power-to-weight ratios compared to air-cooled equivalents.
Fully enclosed oil-loop designs protect internals from corrosive marine salt, abrasive coal dust, and combustible gases (ATEX/IECEx compliance).
Uniform cooling prevents localized thermal hotspots, dramatically reducing insulation degradation and doubling the mean time between failures (MTBF).
By removing large external cooling fans, oil-cooled systems run remarkably quiet, complying with strict occupational safety regulations.
Xi’an Lite SIMO Motor Co., Ltd. is a premier electric company and a cornerstone enterprise in the Chinese mechanical industry. We specialize in the development, engineering, and manufacturing of large/medium-sized, high/low voltage AC motors, DC motors, synchronous motors, and explosion-proof motors. As a comprehensive manufacturing and service supplier, SIMO integrates motor design, advanced mechanical processing, complex mold making, precision assembly, and rigorous testing under one roof.
SIMO consistently ranks at the absolute top of China’s motor manufacturing sector regarding production scale, technical capabilities, and global distribution. Over the past several decades, the company has maintained a rapid development trajectory, delivering advanced power solutions to thousands of industrial clients worldwide.
With a registered capital of 21.5 million RMB and fixed assets valued at 380 million RMB, SIMO operates 3 advanced manufacturing factories and 1 subsidiary. We possess over 1,172 sets of specialized machinery to ensure unmatched production quality.
SIMO Motor is established under state guidance, laying the foundation for modern heavy industrial motor manufacturing in China.
Operations relocate to a new, larger plant in Xi'an City, scaling up output capacity for post-war industrial development.
Following a series of strategic acquisitions and corporate integrations, the factory officially becomes the Xi'an Motor Factory.
Transitioning to meet modern economic demands, the state-owned factory successfully reforms into a highly agile limited liability company.
Establishment of the SIMO Motor Group, expanding our footprint with 14 specialized subsidiaries covering all segments of electric powertrain technology.
The entire manufacturing line moves to a state-of-the-art, high-tech development zone, adopting global automation standards.
The company officially registers as Tech Full Simo Motor, aligning corporate strategy with globalized trade networks.
Focusing on high-efficiency, environment-specific technologies including variable frequency drives, PM motors, and oil-cooled solutions.
How direct liquid cooling solves the physics limitations of air, and what the next decade holds for motor architecture.
Standard air-cooled motors rely on heat conduction from the copper windings through the stator core to the outer frame, which is cooled by an external fan. Air has a very low thermal conductivity (~0.026 W/m·K), introducing high thermal resistance. Water cooling improves on this but introduces safety risks if leakage occurs near high-voltage windings.
Oil cooling systems utilize synthetic, high-dielectric silicone or hydrocarbon-based oil. Because these oils are electrically non-conductive, they can be sprayed directly onto the hot stator end windings or run through channels embedded directly in the rotor shaft. This drops winding temperatures by 30°C to 50°C instantly, preventing insulation aging and maximizing power density.
| Thermal & Mechanical Parameters | Traditional Air Cooled (IC411) | Water Jacket Cooled (IC71W) | Direct Oil Cooled (SIMO Spec) |
|---|---|---|---|
| Thermal Conductivity (W/m·K) | 0.026 (Very Low) | 0.60 (Medium) | 0.13 - 0.16 (High relative to safety) |
| Dielectric Safety Margin | N/A (Air gaps susceptible to dust) | Dangerous if leakage occurs | Absolute (>30 kV breakdown voltage) |
| Motor Footprint Relative Ratio | 100% (Baseline) | 75% (Compact) | 55% - 60% (Ultra-Compact) |
| Active Rotor Core Cooling | External heat exchange only | Difficult, complex seals | Excellent (Via hollow shaft channels) |
| Acoustic Noise Output | High (85 - 95 dBA) | Low (70 - 75 dBA) | Ultra-Low (<65 dBA) |
| Insulation Thermal Degradation Rate | Standard Arrhenius Curve | Moderate | Reduced by 60% due to no hotspots |
How SIMO delivers premium-grade, heavily certified industrial motors at competitive "discount" global rates.
The word "discount" in heavy industry should never imply compromised quality; instead, it represents structural cost optimization. Xi'an Lite SIMO Motor Co., Ltd. achieves this through deep integration into the world's most robust electrical engineering cluster in Shaanxi, China. By sourcing raw copper, high-grade silicon steel sheets, and heavy castings locally, we eliminate the compounded middleman fees that inflate Western-manufactured motor prices.
Our class H and class F Vacuum Pressure Impregnation systems ensure that the insulation resin completely fills every microscopic void, providing absolute protection against moisture, dust, and vibration.
Rotors are balanced down to ISO G1.0 quality grade limits, ensuring vibration-free operation at variable speeds up to 10,000 RPM, preventing bearing wear.
Every single high-voltage and low-voltage motor undergoes full-load dynamometer testing, vibration monitoring, and dielectric tests before dispatch, ensuring out-of-the-box reliability.
Where oil cooled and high-efficiency SIMO motors excel under severe, specialized operating conditions.
In deep mines, space is highly restricted and air is saturated with abrasive coal dust. Traditional air-cooled motors suffer from filter blockages and thermal stress. Our TDMK series and custom oil-cooled synchronous motors are completely sealed, exchanging heat via a closed-loop system, ensuring high-torque operation for ball mills and crushers without dust ingress.
Chemical processing units require flameproof security. Our YBX3, YBX4, YBX5, and YFB3/YFB4 series explosion-proof motors prevent gas ignition. Combining these frames with liquid cooling ensures that even during temporary overloads, the outer casing temperature never reaches the auto-ignition point of surrounding volatile organic compounds (VOCs).
Large municipal pumping stations run continuously, consuming megawatts of power. By using our high-efficiency YE5 IE5 Ultra Premium motors, operators can save up to 4% on annual electricity costs. When configured with liquid cooling, these motors can be submerged directly in water shafts, saving valuable surface pump house real estate.
SIMO motors meet the highest international standards, ensuring seamless localization, installation, and safety compliance across all global jurisdictions.
Professional insights into thermal management, customization, supply chain options, and global support.
Usually, transformer oils, synthetic hydrocarbons, or silicone-based oils are preferred due to their high dielectric breakdown strength (typically >30 kV) and low viscosity. Lower viscosity ensures that the fluid flows rapidly through winding slots and rotor channels, maximizing convective heat transfer. Ester-based biodegradable oils are gaining traction due to environmental and fire safety regulations.
When motors operate at very low speeds (high load), traditional shaft-mounted cooling fans lose their effectiveness because fan speed is tied directly to rotor speed. This is where variable frequency motors like our YVFE3 and YJP series excel. Incorporating independent liquid cooling loops ensures constant cooling regardless of operating speeds, preventing motor overheating under low-frequency, high-torque configurations.
Maintenance focuses primarily on fluid loop integrity. Operators should conduct semi-annual oil analysis tests to check for particulate buildup, moisture content, and dielectric breakdown strength. The closed system design significantly reduces the need for bearing lubrication adjustments and winding cleaning, resulting in a lower lifetime operating cost compared to air-cooled motors in harsh environments.
Yes, SIMO has an active R&D team of 260+ engineers who specialize in custom modifications. Whether you require shaft extensions, non-standard mounting configurations (IM B3, IM V1, etc.), unique voltage inputs (ranging from 380V to 13.8kV), or specific ATEX zone ratings, our factory can engineer a direct drop-in replacement tailored to your existing mechanical infrastructure.
View more high-voltage, slip-ring, DC, and premium efficiency motors engineered by SIMO to keep global supply chains moving efficiently.
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