Discover our main selection of heavy-duty industrial electric motors, built for durability, explosive atmosphere security, and customized starting torque performance.
For more than 60 years, Xi’an Lite SIMO Motor Co., Ltd. has served as a cornerstone of China's electrical machinery manufacturing industry. Built on engineering heritage and deep technical expertise, our corporation specializes in designing and manufacturing large/medium-sized, high and low voltage AC motors, DC motors, synchronous motors, and highly specialized explosion-proof industrial electric motors.
As a comprehensive manufacturer and services supplier, our capabilities extend from initial custom motor design, precision mechanical machining, and mold fabrication to dynamic assembly, rigorous load testing, and direct supply chain operations. Today, SIMO ranks at the top of China's industrial motor market with three modern production plants, a registered capital of 21.5 million RMB, and fixed assets exceeding 380 million RMB.
Under the hood of SIMO's signature wound rotor and slip ring designs, engineered to deliver unparalleled starting torque under severe loads.
Unlike squirrel-cage motors, wound rotor slip ring motors incorporate a 3-phase insulated winding connected to slip rings. This enables the introduction of external resistance, giving absolute control over starting torque and inrush current characteristics.
Class F and Class H Vacuum Pressure Impregnation (VPI) is applied to all windings. This prevents micro-vibrations, guards against heavy dust environments, and delivers thermal resistance suitable for continuous high-temperature industrial settings.
Incorporates state-of-the-art constant force brush springs and high-grade carbon brush materials. Simplifies regular maintenance checks and guarantees continuous contact stability without premature copper ring pitting.
| Series & Classification | Voltage Options | Power Output Range | Primary Industrial Application | Key Performance Edge |
|---|---|---|---|---|
| YR / YRQ Series (LV/HV Slip Ring) | 380V, 6KV, 10KV | Up to 25,000 kW | Heavy Crushers, Compressors, Ball Mills | Adjustable starting current limiters, high thermal inertia. |
| YRKK Series (Air-Air Cooled Slip Ring) | 6KV, 10KV | 160 kW – 10,000 kW | Steel rolling mills, cement mixers, mine hoists | Enclosed air-to-air heat exchangers, robust outdoor IP54/IP55 rating. |
| YRKS Series (Water-Air Cooled Slip Ring) | 6KV, 10KV | 220 kW – 15,000 kW | Water Conservancy, Mine Extraction, Large Fans | Ultra-low noise, superior cooling performance in closed/dense configurations. |
| TDMK Series (Large Synchronous Mine Mill) | 6KV, 10KV | Up to 20,000 kW | Primary Mining Mills, Sag Mills | Power factor correction capabilities with immense torque tolerance. |
Operating heavy machinery under severe load conditions demands custom starting characteristics. Standard squirrel-cage motors suffer from high starting inrush current (up to 600-700% of nominal current), which causes severe voltage drops in the power grid. SIMO Slip Ring Motors solve this. By allowing connection of a rotor starter (resistor grid or liquid starter), starting current is reduced to 150-200% while keeping torque close to breakdown limit.
Our motors are optimized for localized industrial challenges:
Why global heavy-industry OEMs rely on SIMO's integrated manufacturing and vertical quality control.
By keeping core processes in-house (such as metal casting, precision punching, mechanical processing, and mold assembly), we dramatically reduce lead times for custom frame sizes and non-standard shaft configurations.
Equipped with 1172 sets of high-precision diagnostic and manufacturing equipment. Every motor undergoes insulation resistance testing, vibration analysis, load tests, and mechanical runout verification before leaving our facility.
With 260+ technical engineers, including 21 senior engineers and 15 expert engineers, we don't just supply standard catalogue items. We co-develop customized slip ring motors to fit existing mounting foundations perfectly.
The convergence of heavy electro-mechanics with smart diagnostic technologies for Industry 4.0.
Integration of real-time sensory units monitoring temperature inside the slip-ring enclosure, carbon brush wear markers, and vibration spikes, transmitting data directly to centralized control centers.
Developing hermetically sealed slip-ring enclosures with specialized dynamic air circulation systems, keeping maintenance intervals long even in high-moisture or sandy desert applications.
Optimizing electromagnetic designs through finite element analysis (FEA), lowering copper losses in the rotor windings to push the boundary of slip ring motor efficiency towards modern green energy standards.
Reliability verified by major testing organizations. Our machinery meets international parameters for safe operation across diverse grid systems.
SIMO products are certified under ISO9001 Quality System, EU CE, US UL, Russian GOST, and more, ensuring seamless deployment in global environments.
Get answers to critical engineering, operation, and selection questions regarding wound rotor asynchronous systems.
Slip ring motors are selected for applications requiring very high starting torque under full load (e.g., ball mills, crushers) and where the electrical grid capacity is limited. By inserting external resistance in series with the rotor winding through the slip rings, the motor can generate maximum torque at starting speed while drawing significantly less starting current.
Due to sliding electrical contact, slip ring assemblies require periodic inspection. This includes monitoring carbon brush wear, maintaining correct spring tension on brush holders, removing carbon dust from the housing, and checking for ring eccentricities or pitting. SIMO's high-tech brush holders minimize these maintenance intervals significantly.
YRKS (water-to-air cooling) motors transfer heat through an internal water heat exchanger, allowing the motor to be more compact, silent, and independent of ambient air quality. YRKK (air-to-air cooling) utilizes dual-path ventilation pipes which are exceptionally robust, simple, and optimal for outdoor locations with available wind flow, eliminating the need for cooling water piping.
Yes. Our engineers specialize in matching legacy structural dimensions, including shaft heights, mounting holes, coupling types, and terminal box positions. This minimizes expensive piping or foundation alterations in older plants during upgrades.
Browse our robust portfolio of custom asynchronous high-voltage and low-voltage motors built for safety-critical and hazardous installations.
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