2500kW YKK Series HV Motor with IC611 Air‑to‑Air Cooling ‑ Model YKK630‑4

Model YKK630‑4 is a high‑power squirrel‑cage high‑voltage asynchronous motor within YKK product family, rated at 2500 kW, 4‑pole configuration and equipped with IC611 air‑to‑air closed cooling system. Manufactured to comply with IEC standards, this box‑type heavy‑duty motor is engineered for S1 continuous full‑load operation. Its sealed cooling architecture isolates internal air circulation from surrounding workshop atmosphere, enabling stable performance in dusty, humid and slightly corrosive industrial environments. Widely used in power, cement, mining and metallurgy industries, it delivers reliable driving power for large fans, compressors, ball mills and belt conveyors for heavy‑industrial projects.

Core Technical Parameters 

Electromagnetic design of YKK630‑4 is optimized by finite‑element simulation targeting 2500 kW high‑power operating conditions. The stator core adopts high‑performance low‑loss silicon‑steel sheets, which effectively reduce iron loss, stray loss and magnetic leakage under long‑term full‑load running. Stator windings are assembled with high‑strength corona‑resistant magnet wire and processed with complete VPI vacuum pressure impregnation. The solid integrated winding structure improves dielectric strength, thermal stability and resistance against electrical aging, capable of enduring grid voltage fluctuation and frequent startup impact in high‑voltage power networks. Given the 2500 kW high‑power rating, copper‑bar squirrel‑cage rotor is adopted instead of cast‑aluminum design. Copper‑bar rotor provides superior mechanical rigidity, lower rotor loss and excellent starting performance, restricting starting current while maintaining sufficient starting torque to mitigate impact on factory power supply. Every rotor assembly undergoes high‑precision dynamic balance calibration to strictly control vibration and noise during full‑load operation.

This motor features welded steel‑plate box‑type frame with high structural stiffness and anti‑shock performance. The core feature is the top‑mounted IC611 air‑to‑air heat exchanger with two independent closed air loops. The internal hot air circulates within the sealed motor cavity and exchanges heat with external fresh cooling air through the heat exchanger. Since internal air circuit is completely separated from workshop ambient air, dust, moisture and industrial fumes cannot contaminate windings and iron core, slowing insulation fouling and extending service life significantly compared with open‑type IP23 motors.

Bearing system is configured with heavy‑duty sliding bearings for this large‑power model. PT100 temperature sensors can be embedded inside stator windings and bearing housings as optional configuration. Real‑time temperature signals can be transmitted to central control system for remote monitoring and over‑temperature early warning. Space heater is optional to prevent winding condensation under shutdown status. Customization options include high‑altitude modification, tropical anti‑humidity & anti‑corrosion coating, special terminal box layout and double shaft extension according to site conditions.

YKK630‑4 2500 kW motor is mostly selected to drive large induced‑draft fans, process compressors, ball mills and heavy‑duty belt conveyors in thermal power plants, cement works, mining and metallurgical complexes. Before delivery, each unit completes comprehensive factory acceptance tests covering insulation resistance test, high‑voltage withstand test, no‑load running test, vibration, noise and power‑factor inspection. Featuring high power output, closed protection, stable thermal performance and low maintenance demand, YKK630‑4 serves as a proven high‑power drive solution for heavy‑duty continuous‑production industrial facilities.