Product Highlights

High Efficiency & Energy Saving: Optimized design with low-loss silicon steel sheets cuts motor losses and boosts output capacity. Customizable Voltage and Power: Rated power reaches up to 25000kW; available voltage options include 6kV, 10kV, 11kV, 13.2kV and 13.8kV. Reliable Squirrel-Cage Rotor: Equipped with cast aluminum or high-performance welded copper bar rotors, free from breakage for stable and trouble-free operation. Premium Insulation Technology: Stator windings adopt Class F insulation materials with VPI vacuum pressure impregnation treatment, delivering outstanding moisture resistance and impulse withstand capability. Flexible Protection and Cooling: Protection grades ranging from IP23 to IP56; cooling modes IC01, IC611 and IC81W are optional to match site requirements. Global Standard Compliance: Approved with ISO9001, CCC and CE certifications; conforms to GB755 national standard and IEC 60034-1 international standard. User-Friendly Maintenance Design: Modular box-type construction grants easy access for installation and overhaul; on-line oil filling and draining without shutdown. Proven Industrial Track Record: Exported to more than 20 countries worldwide; ideal for compressors, fans, pumps and mining machinery.

Product Attributes

Product Description

The Y, YKS, YQF, YKK squirrel cage and YR, YRKS, YRQF, YRKK wound rotor high voltage three-phase induction motor series were initially introduced and developed by our factory back in the 1980s, with over 30 years of iterative upgrading. Benefiting from advances in insulation materials, adoption of low-loss silicon steel sheets, upgraded technical grades and optimized electromagnetic design, these motors feature reduced power loss and improved power density. Drawing on nearly 60 years of high voltage induction motor design and manufacturing experience, our team carried out the latest round of optimization to satisfy domestic and global market demands. Test results verify that this motor series reaches or approaches world-class levels in both technical performance and economic efficiency. Mass-produced and widely deployed across China, these motors have been exported to over 20 countries and regions covering Europe, America, Africa and other areas, earning consistent positive feedback from end users. Built with premium raw materials and mature manufacturing processes, they stand out for high efficiency, energy saving, low vibration, stable operation and convenient installation & maintenance. Power ratings, electrical characteristics, mounting dimensions and tolerances comply with GB755 Rotating electrical machines – Ratings and performance, IEC 60034-1 and relevant machinery industry standards. This motor family offers 5 enclosure protection grades: IP23, IP44, IP54, IP55 and IP56 per GB4942.1 and IEC 60034-5. IP23 units can be converted to IP44 (pipe ventilation) or IPW24 (weather-protected type). Custom protection grades are available upon request. Three standard cooling methods are supplied as specified in GB/T1993 and IEC 60034-6: IC01, IC611 and IC81W. Alternative cooling schemes can be customized according to customer requirements. The standard construction and mounting form is IMB3 (horizontal foot-mounted), compliant with GB997 and IEC 60034-7.

Based on rotor type, protection grade and cooling system, the series is divided into 8 sub-models:

The technical data and outline mounting dimensions of 10kV motors can be adapted to develop 3kV, 10.5kV and 11kV variants of the same frame sizes.

Application

These high voltage induction motors serve as prime movers to drive compressors, fans, water pumps, conveyors and other general machinery. They are widely used in mines, machinery plants, petrochemical facilities, power stations and other industrial and mining sites. When ordered for equipment with large rotational inertia such as blowers, coal mills, rolling mills, crushers and belt conveyors, customers shall provide complete technical parameters and sign a technical agreement with us for dedicated design, to guarantee reliable motor operation.

Normal Operating Conditions

• Altitude ≤1000m above sea level
• Maximum ambient temperature ≤40°C; minimum ambient temperature: -15°C for rolling bearing motors, 5°C for sliding bearing motors; YKS / YRKS series minimum ambient temperature 5°C
• For YKS and YRKS air-water cooled motors: cooling water inlet temperature 5°C ~ 33°C
• Monthly average maximum relative humidity ≤90% in humid months, with monthly average minimum temperature ≤25°C
• Power supply frequency: 50Hz ±1%
• Supply voltage fluctuation within ±5% of rated voltage
• Duty type: continuous running S1

Construction Description

Y and YR form the base series with IP23 protection and IC01 cooling. Derivative models including YKS (air-water cooling), YQF (weather-protected), YKK (air-air cooling), YRKS, YRQF and YRKK are developed from this base platform. It adopts internationally popular box-type construction. The frame and end shields are fabricated from welded steel plates with high rigidity and light weight. After removing the protective cover or cooler, internal inspection and access are straightforward, simplifying field installation and servicing. The stator features external core pressing structure. Stator windings use Class F insulation and anti-corona materials. Winding terminals are secured with specialized reliable binding techniques. The whole stator undergoes VPI vacuum pressure impregnation with solventless Class F varnish, delivering stable insulation, excellent moisture resistance and impulse withstand capability. Most squirrel cage rotors are cast aluminum design with zero risk of rotor bar breakage for dependable operation. Copper bar squirrel cage rotors use advanced high-reliability welding and slot locking technology. Wound rotors also adopt Class F insulation and full VPI treatment. Two bearing configurations are available: rolling bearing and sliding bearing, selected according to motor power and speed. Basic bearing protection grade is IP44, and upgraded bearing sealing matches higher motor protection grades. Rolling bearing versions are fitted with on-line oil filling and draining fittings. Operators can replenish or drain lubricant without stopping the motor. The main terminal box is sealed to IP54. It is normally mounted on the non-drive end right side (viewed from shaft extension), and can be relocated to the left side on request. Cable entry ports support top, bottom, left and right orientation, with dedicated independent earthing terminals inside.

Starting Guide for Y, YKS, YQF, YKK Induction Motors

Finite element thermal and stress simulation is applied for squirrel cage rotor design to prevent premature rotor damage caused by overload during startup. Customers shall comply with the following requirements:

• The total inertia of driven machinery (referred to motor speed) shall not exceed the allowable load inertia listed in technical datasheets
• The terminal voltage at motor terminals shall remain no less than 85% of rated voltage during starting
• The load torque curve matches typical fan or pump resistance torque characteristics

When the above conditions are satisfied, the motor permits two successive cold starts or one hot start, with interval until full natural stop. Additional restart attempts require a minimum 1-hour waiting period. If driven load inertia exceeds specified limits, frequent starting or heavy-load startup is required, please contact our engineering team for custom design to ensure safe starting performance.

Certifications

ISO9001, CCC, CE

Packaging & Shipping

YSL Series High Voltage AC Squirrel Cage Asynchronous Induction Motor Power range: 0.55kW ~ 20000kW Voltage range: 380V to 13.8kV Shaft height: 80mm–1120mm

Our Advantages

Wide power coverage Superior starting characteristics Suitable for all industrial sectors for global supply High reliability to cut downtime and operational costs Flexible customizable design Witness FAT (Factory Acceptance Test) available on-site or remotely

Quality Control & In-process Inspection

All measuring instruments and gauges are calibrated annually. Full-stage inspection is implemented for every component.

Test Items

Every motor must complete full testing before shipment and comes with an individual test report upon passing.

• Routine test: Winding three-phase DC resistance, winding insulation resistance to earth, high voltage withstand test, no-load current, no-load power, no-load loss, three-phase current unbalance, locked rotor current, locked rotor torque, maximum torque, rotation direction, vibration (horizontal / vertical / axial), noise and more
• Type test: Full-load input power, full-load current, stator winding loss, rotor winding loss, iron loss, mechanical loss, stray loss, full-load slip, stator winding temperature rise, bearing temperature, hot insulation resistance, overload test, full-load power factor, efficiency and more

After Sales Service

Warranty Terms

Standard warranty: 12 months from commissioning or 18 months from delivery, whichever occurs first. Extended warranty plans are available, please contact our sales team for quotation.