Y, YKK Series High‑Voltage Three‑Phase Asynchronous Motors

Y and YKK series high‑voltage three‑phase asynchronous motors are classic squirrel‑cage induction motor families manufactured in compliance with IEC international standards. Both series adopt squirrel‑cage rotor design for S1 continuous heavy‑duty operation, yet they differ greatly in cooling structure and protection performance. Y series features open‑type IC01 ventilation and IP23 protection grade, suitable for clean and well‑ventilated indoor workshops. YKK series is built as closed box‑type motors equipped with IC611 air‑to‑air heat exchanger, delivering higher protection grade for dusty, humid and lightly corrosive industrial environments. These two product lines cover wide power and voltage ranges, serving as mainstream drive solutions for fans, water pumps, compressors and crushers across power, mining, cement and chemical industries.

Core Technical Parameters

Electromagnetic design for both series is optimized via finite element simulation. The stator core is laminated with premium low‑loss silicon steel sheets to minimize iron loss, stray loss and magnetic leakage during long‑time full‑load running. Stator windings use high‑strength electromagnetic wires and go through VPI vacuum pressure impregnation treatment. The integrated winding structure provides excellent dielectric strength, corona‑resistance and thermal‑aging resistance, capable of enduring voltage fluctuation and repeated startup impact from high‑voltage power grid. Cast‑aluminum rotor is cost‑effective for medium‑power models, while copper‑bar rotor offers superior mechanical strength, lower loss and better starting performance for large‑power heavy‑load conditions. Every rotor assembly undergoes high‑precision dynamic balance calibration to keep vibration and noise within standard allowable limits.

Structural differences define their applicable scenarios. Y series open‑ventilation IC01 structure inhales fresh ambient air and discharges hot air directly. It features high cooling efficiency and low cost, yet the IP23 open layout cannot block fine dust and moisture. Thus Y series is only recommended for clean pump houses, power plant auxiliary workshops and well‑ventilated indoor sites. YKK adopts welded rigid steel‑plate box frame and top‑mounted air‑to‑air cooler. Two fully independent air loops are arranged inside: internal hot air circulates within sealed cavity and exchanges heat with external cool air through heat exchanger. Since internal air circuit is completely isolated from workshop atmosphere, dust, smoke and damp gas cannot contaminate windings and iron core, greatly reducing insulation fouling and extending service life.

Bearing configuration is selected according to power rating. Medium‑power units adopt heavy‑duty rolling bearings; large‑power models are equipped with sliding bearings. PT100 temperature sensors can be embedded in stator windings and bearing chambers as optional configuration, feeding real‑time temperature signals to central control system for remote monitoring and over‑temperature early warning. Space heaters can be installed to prevent condensation moisture during motor shutdown. Customization options include tropical anti‑humidity coating, high‑altitude adaptation, special terminal box layout and double shaft extension.

Y series is widely used for power‑station induced draft fans, forced‑draft fans and circulating water pumps. YKK series is preferred for cement plants, mines and chemical workshops to drive ball mills, belt conveyors, compressors and large‑size blowers. Before shipment, each motor completes full factory acceptance tests covering insulation resistance test, high‑voltage withstand test, no‑load running test, vibration and noise inspection. With mature design, reliable operation and flexible model selection between open‑type and closed‑type structures, Y and YKK series high‑voltage asynchronous motors provide proven and economical high‑power driving solutions for global heavy‑industry projects.