Y2 Series 2-Pole Three-Phase Asynchronous Motor

Y2 Series 2-Pole Motor — 3000 rpm High-Speed Performance

The Y2-*-2 two-pole motor series achieves a synchronous speed of 3000 r/min under 50Hz power supply, making it the fastest-running standard frame motor in the three-phase induction motor range. The higher rotational speed means a given power output is delivered at lower torque, which reduces frame size and weight compared to a 4-pole or 6-pole equivalent at the same power rating.

Korea Ever-Power produces 20 standard frame sizes in the 2-pole configuration, from the compact 63M frame at 0.18 kW up to the 315L frame at 200 kW. The design follows GB/T18680-2008 for dimensional interchangeability, ensuring direct replacement compatibility with all major IEC-frame motors on the market.

All Y2-2-pole motors feature die-cast aluminum fins for enhanced heat dissipation, low-noise ball bearings with L10 bearing life exceeding 20,000 hours, and Class F insulation with temperature rise evaluated at Class B standard — providing a generous thermal margin for extended motor life in demanding duty cycles.

Environmental Limits

• Ambient temperature: −15°C to +40°C
• Relative humidity: ≤ 90% (no condensation)
• Altitude: ≤ 1,000 m above sea level
• Frequency: 50 Hz standard (60 Hz available)
• Supply voltage tolerance: ±5% of rated
• Duty cycle: S1 continuous operation

Standards and Certification

• GB/T18680-2008 — Y2 series technical conditions
• JB/T8680-1998 — Chinese national standard
• IEC 60034-1 — rotating electrical machines
• IEC 60034-5 — IP protection degrees
• ISO 1680 — noise measurement method
• ISO 2373 — vibration grade

Motor Features

• IP54 — dust-protected, splash-proof
• Class F insulation (155°C rated)
• Temperature rise per Class B (80K)
• IC0141 TEFC cooling method
• Vibration ≤ 1.8 mm/s (frames 63–132)
• Winding: Y-connection ≤ 3 kW; Δ-connection ≥ 4 kW

A 2-pole motor operates at twice the speed of a 4-pole motor for the same supply frequency. At 50Hz, synchronous speed is 3000 rpm, and actual full-load speed typically falls between 2800 and 2982 rpm depending on frame size. This high shaft speed makes 2-pole motors the preferred choice when the driven machine operates at similar speeds, such as centrifugal pumps, axial fans, centrifugal compressors, high-speed conveyors, and direct-drive generators.

Because power equals torque times speed, a 2-pole motor producing the same output power as a 4-pole motor requires only half the torque. Lower torque demand means smaller shaft diameter, lighter rotor, reduced bearing loads, and a more compact overall package. For applications where installation space is limited, a 2-pole motor often provides the same power in a smaller IEC frame size.

The efficiency characteristic of 2-pole motors at 50Hz is generally favorable in the mid-to-large power range (above 5.5 kW), where the Y2-132S-2 through Y2-315L2-2 models achieve efficiencies from 85.7% to 94.8%. The high shaft speed also means that belt drives, chain drives, and couplings to slower-speed equipment require only a modest reduction ratio, simplifying drivetrain design.

HVAC and Pump Systems

Direct coupling to centrifugal pumps for water supply, circulation, and HVAC chiller systems

Chemical Plant Drives

Powering process pumps, agitators, and blowers in chemical, petrochemical, and pharmaceutical facilities

Textile Machinery

High-speed spinning, weaving, and winding machines that benefit from 3000 rpm direct drive

Food Processing Lines

Hygienic drives for food-grade pumps, conveyors, and mixing equipment requiring compact high-speed motors

What is the actual running speed of a Y2 2-pole motor at 50Hz?

The synchronous speed at 50Hz for a 2-pole motor is 3000 rpm. The actual full-load slip speed ranges from 2800 rpm (smaller frames 63–80) to 2982 rpm (frame 315). The slip value depends on motor size: smaller motors have proportionally higher slip. For precision speed matching, the exact rated speed for each model is shown in the technical data table above.

Can Y2 2-pole motors operate on a 60Hz supply?

Yes. The Y2 series is available in 60Hz variants. On a 60Hz supply, a 2-pole motor runs at a synchronous speed of 3600 rpm. Power output increases proportionally with frequency for the same torque, so a 60Hz Y2 motor produces approximately 20% more power than the same frame at 50Hz. Please specify 60Hz (and voltage, e.g., 460V 60Hz) when placing an order.

Is the Y2 2-pole motor compatible with inverter drive (VFD) control?

Standard Y2 motors are not specifically rated for VFD operation. For variable speed applications requiring inverter drive, we recommend the YVF2 series VFD motor, which features an independent IC416 external cooling fan maintaining full airflow at low speed, reinforced insulation for dV/dt stress, and low rotor inertia for fast speed response.

What flange types are available for the Y2-*-2 range?

Y2 2-pole motors are available in IM B3 (foot mount, no flange), IM B5 (foot mount with large flange, plain through-holes), IM B35 (foot mount with flange), IM B14 (no foot, small flange with threaded holes), and IM V1 (vertical mounting, no foot, plain-hole flange). The standard delivery is B3. For B5 or B14 mounting please specify the flange code and frame size when ordering, as flange dimensions vary by frame.

What is the difference between Y2 and YE3/YE4 motors in the same frame?

The Y2 series meets IE1 and IE2 efficiency levels per IEC 60034-30-1. The YE3 series achieves IE3 (Premium Efficiency) and the YE4 series achieves IE4 (Super Premium Efficiency), typically requiring 2–4% less electrical input for the same mechanical output. YE3 and YE4 motors use higher-grade silicon steel laminations, optimized winding configurations, and precision machining for lower friction losses. They share the same IEC frame dimensions for direct dimensional interchangeability.

What voltages are available for Y2 2-pole motors?

Standard voltage is 380V 50Hz (Y-connection for powers up to 3kW, delta-connection for 4kW and above). Alternative voltages including 400V, 415V, 440V, 460V, and dual-voltage windings (e.g., 220/380V or 380/660V) are available on request. For export to markets using 460V 60Hz or 415V 50Hz, please specify the voltage requirement at the time of order.

How should I read the locked-rotor current ratio (Ist/In) in the table?

Ist/In is the ratio of the starting current to the rated current. A value of 7.5 means the motor draws 7.5 times its rated current at the moment of startup (zero speed). This transient current typically lasts 2–10 seconds until the motor accelerates to running speed. Knowing Ist/In is essential for sizing circuit breakers, contactors, and soft-starters, and for confirming that the upstream supply can tolerate the inrush without causing voltage drops that affect other equipment on the same circuit.

What is the minimum order quantity and lead time for Y2 2-pole motors?

Standard frame sizes (63M through 160L) are typically available from stock or with a 2–4 week lead time for small quantities. Larger frames (180M through 315L) and non-standard voltages may require 4–8 weeks for production. There is no minimum order quantity for standard models, but bulk pricing is available for orders of 10 units and above. Contact our sales team for current stock availability and pricing.