YRKS 7109-4CT Three Phase Slip Ring Induction Motor 3550kW

Title:

YRKS  Three Phase Induction Motor

Brief Introduction

The SIMO YRKS series three phase slip ring induction motor stands as a flagship line of high-power, heavy-duty slip-ring (wound rotor) induction motors, engineered to meet the most demanding requirements of industrial sectors worldwide. Designed and manufactured by Xi'an SIMO Motor Co., Ltd., a leading name in motor technology, this series combines robust mechanical construction with advanced electrical performance to deliver reliable, long-lasting operation in applications where high starting torque, controlled acceleration, and low maintenance are non-negotiable.

At the core of the YRKS series three phase slip ring induction motor is its wound rotor design, which sets it apart from standard squirrel cage motors. By incorporating external resistors into the rotor circuit, these motors achieve exceptional starting torque with minimal inrush current-a critical advantage for heavy-load applications such as ball mills, crushers, conveyor systems, and large-scale pumps. This design also enables smooth, cost-effective speed regulation without the need for complex variable frequency drives, making the YRKS series an ideal choice for industries like mining, metallurgy, cement production, and power generation, where precise control over large machinery is essential.

The YRKS7109-4CT model, a representative of the series, exemplifies its technical prowess. Rated at 3550 kW and 50 Hz, it operates at a stable 1490 r/min, with a stator voltage of 10,000 V and a rotor voltage of 2170 V. Both stator and rotor windings feature Class F insulation, providing thermal stability and resistance to harsh operating temperatures, while the IP54 protection rating shields internal components from dust ingress and water splashes. The IC 81W cooling system ensures efficient heat dissipation during continuous S1 duty cycles, preventing overheating and extending the motor's service life. With a power factor of 0.86, the YRKS7109-4CT optimizes energy utilization, reducing long-term operational costs and supporting sustainability goals.

Mechanically, the YRKS series three phase slip ring induction motor is built for durability. Premium DQ18-200B bearings on both drive and non-drive ends minimize vibration and noise, while the standardized Y connection for stator and rotor simplifies installation and retrofitting with existing equipment. Compliant with the GB/T13957 standard, these motors undergo rigorous testing to ensure performance and reliability, backed by SIMO's decades of engineering expertise.

Beyond technical excellence, the YRKS series offers tangible business benefits. Its ability to handle heavy loads and frequent starts reduces downtime, while the low-maintenance design lowers operational overhead. For global customers, the series combines Chinese manufacturing precision with adherence to international quality standards, making it a trusted solution for critical industrial drives. Whether powering a cement mill in Southeast Asia or a conveyor belt in a European mine, the SIMO YRKS series delivers the power, performance, and peace of mind that modern industries demand.

Main Technical Parameters

Why choose Simo Brand YRKS series of Motor?

YRKS series high-voltage motors use international advanced motor design technology, combined with strict production technology and high-quality raw materials, to ensure that each motor performs well in long-term use.

Production Details

Frame

• Box structure frame, easy for maintaining and installation

• Flexible for special installation dimensions

• Customizable outlook and dimensions

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Stator

• 99.9% pure copper winding for stator to ensure the output power and efficiency

• Excellent insulation system with 5 more processing flows

• All the windings are fitted in by handwork to ensure all slots are full and avoid any possible winding flaw.

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Rotor

• Aluminum casting rotor with high quality silicon steel rotor core to assure induction efficiency

• Copper bar rotor is available for YKK motor

• Well and precisely machined shafts with good capacity of strength and toughness

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Testing

• All motors must pass the piece testing before painting and packaging

• Type tests will be regularly performed for each series, more often for new developed series and variants.

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Package and delivery

• All motors will be packaged well before delivery

• Plastic cover inside, vacuum tin foil outer and then solid wood box

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Applications

In the mining industry, YRKS series motors are widely used in mining equipment, hoists, crushers and other equipment.These equipment usually need to withstand large loads, and the high power output of YRKS motors can meet these needs and ensure the efficient operation of mine operations.

Cement

Power Station

Water

Mining

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