800kW YJS Series High Voltage Motor | 6000V Rib Cooled Type

The 800 kW 6000V YJS series rib‑cooled high‑voltage three‑phase squirrel‑cage asynchronous motor is a compact totally‑enclosed high‑efficiency drive unit designed in compliance with IEC international standards. Adopting IC411 rib‑surface cooling (TEFC‑totally enclosed fan‑cooled), this motor eliminates bulky top‑mounted air‑to‑air heat exchangers which are typical for YKK box‑type motors. Built with high‑strength cast‑iron housing with dense external cooling ribs, it achieves high power density and compact overall dimensions. Suitable for S1 continuous heavy‑duty operation, it can be directly connected to 6 kV industrial power grid, widely applied in power plants, petrochemical, water conservancy, cement and mining industries for driving water pumps, fans, compressors and other heavy‑duty process equipment.

Core Technical Parameters 

Electromagnetic design is optimized by finite‑element simulation for 800 kW high‑power compact frame constraints. The stator core is laminated with premium low‑loss silicon‑steel sheets to effectively reduce iron loss, stray loss and magnetic leakage under long‑term full‑load and partial‑load running conditions. Stator windings adopt corona‑resistant high‑conductivity copper magnet wire and go through complete VPI vacuum pressure impregnation treatment. The solid integrated winding structure delivers excellent dielectric strength, thermal stability and anti‑aging performance, capable of resisting industrial grid voltage fluctuation and repeated startup impact. For this 800 kW high‑power specification, copper‑bar squirrel‑cage rotor is configured as standard, featuring superior mechanical rigidity, low rotor loss and reliable starting characteristics. Each rotor assembly undergoes strict high‑precision dynamic balance calibration to keep vibration and noise within IEC‑specified allowable limits across the full operating range.

The outstanding structural advantage of this YJS motor lies in its IC411 rib‑cooled totally‑enclosed construction. Heat generated inside the motor is transferred to densely arranged external cooling ribs of the cast‑iron frame and dissipated by a shaft‑driven external fan. Without additional air‑to‑air heat exchanger components, overall length and installation height are greatly reduced compared with equivalent‑power YKK motors, saving valuable space inside equipment rooms. The fully‑enclosed housing prevents dust, fibre debris and mild corrosive gas from invading internal windings and iron core, offering much better environmental adaptability than open‑type IP23 high‑voltage motors.

Bearing configuration is matched according to pole number and operating speed. Heavy‑duty rolling bearings are adopted for most medium‑speed models. PT100 temperature sensors can be embedded in stator windings and bearing housings as optional configuration, transmitting real‑time temperature signals to central control system for remote condition monitoring and over‑temperature early warning. Space heater can be equipped to avoid winding condensation during motor shutdown. For variable‑frequency energy‑saving transformation projects, IC416 independent external fan cooling can be supplied to guarantee sufficient cooling airflow under low‑speed operationMade-in-Ch.... Customization options include high‑altitude adaptation, damp‑tropical anti‑corrosion coating, modified terminal‑box orientation and double‑shaft extension to satisfy diverse on‑site project requirements.

This 800 kW YJS rib‑cooled motor is widely used for multiple industrial scenarios. In thermal power stations, it drives large‑capacity auxiliary fans and circulating water pumps; in petrochemical enterprises, it matches process compressors and conveying equipment; in cement and mining plants, it serves blowers and large water pumps. It supports direct‑on‑line startup or high‑voltage soft‑starter configuration according to actual grid capacity. Before delivery, each motor completes comprehensive factory acceptance tests, covering insulation resistance test, high‑voltage withstand test, no‑load running test, efficiency verification, vibration and noise inspection. Featuring compact layout, high protection grade, stable high‑power output and convenient maintenance, the 800 kW YJS 6000V rib‑cooled high‑voltage motor provides an economical and reliable drive solution for modern industrial facilities with limited installation space.