Y2 Series 6-Pole Three-Phase Asynchronous Motor

Y2 Series 6-Pole Motor — 1000 rpm High-Torque Industrial Drive

The Y2-*-6 six-pole motor series delivers a synchronous speed of 1000 r/min at 50Hz, producing approximately 50% more shaft torque than a 4-pole motor of identical power rating at the same frame size. This torque advantage is fundamental to its role in heavy industrial applications where direct-drive or minimal-reduction drivetrain design is preferred, eliminating one stage of gearing and its associated power loss, maintenance cost, and mechanical complexity.

Korea Ever-Power produces 24 standard model ratings in the 6-pole configuration, from the Y2-71M1-6 at 0.18 kW through the Y2-315L2-6 at 132 kW. Frame sizes span IEC 71M through 315L, fully interchangeable with Y-series, YE3-series, and equivalent international IEC-frame motors. The larger air gap and wider pole pitch of 6-pole designs result in lower acoustic noise than 2-pole or 4-pole motors at comparable power levels.

When paired with our helical gear reducers or worm gear reducers, the 6-pole motor requires a lower reduction ratio to reach the desired final output speed, resulting in a more efficient and compact gearmotor assembly. For applications needing precise speed control at 1000 rpm base speed, the YVF2 variable frequency motor series shares identical frame dimensions and serves as a direct substitution.

Rated Torque Comparison at 7.5 kW

For the same 7.5 kW rated power, the torque at rated speed differs substantially across pole counts:

Torque = (P × 9550) / n. Highlighted row is the 6-pole motor on this page.

When to Choose 6-Pole

Choose a 6-pole motor when one or more of the following conditions apply to your application:

• The driven machine operates optimally at 900–1000 rpm and no gearbox is required
• High starting torque is needed (Tst/Tn ratios of 2.0–2.1 across the range)
• Low acoustic noise is a priority — 6-pole motors produce less fan and electromagnetic noise than 2-pole or 4-pole models
• The load has high inertia (large flywheels, heavy conveyors) requiring long acceleration without overheating
• The motor will be paired with a gearbox requiring input speed below 1000 rpm to reach very low final output speeds
• Variable frequency inverter control is not available but reduced output speed compared to 4-pole is desired

Conveyors and Hoists

High starting torque and controlled acceleration for loaded belt conveyors, chain hoists, and overhead crane drives

Mixers and Agitators

Direct-drive or single-stage reduction to mixing vessels, kneaders, and agitators in chemical and food processing

Low-Noise Environments

Textile looms, woodworking, and production environments where lower acoustic noise is a priority over high shaft speed

Food and Beverage

Gentle agitation of food products, dough mixers, filling machines, and packaging conveyors requiring moderate speed and high torque

Environmental Limits

• Ambient temperature: −15°C to +40°C
• Relative humidity: ≤ 90% (no condensation)
• Altitude: ≤ 1,000 m above sea level
• Frequency: 50 Hz (60 Hz available on request)
• Voltage tolerance: ±5% of rated value
• 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
• ISO 2373 — vibration grading

Motor Features

• IP54 — dust-protected, splash-proof
• Class F insulation (155°C rated)
• Temperature rise per Class B (80K)
• IC0141 TEFC forced air cooling
• Vibration ≤ 1.8 mm/s (frames 71–132)
• Vibration ≤ 2.8 mm/s (frames 160 and above)

Why do some Y2-6-pole models start at frame 71 rather than 63?

Six-pole motors have a longer magnetic pole pitch than 4-pole or 2-pole motors of the same frame size. At very small frame sizes (63M), the stator bore is too small to physically accommodate six poles while maintaining adequate slot depth and winding area for useful output power. The smallest practical 6-pole frame in the Y2 range is 71M, producing 0.18 kW. The 63M frame is used only for 2-pole and 4-pole configurations where the shorter pole pitch requires less stator circumference per pole.

How does the noise level of a 6-pole motor compare to a 4-pole of the same power?

6-pole motors are measurably quieter than 4-pole motors at equivalent power. For example, the Y2-132M-4 (7.5 kW) generates noise of 71 dB(A) at rated load, while the Y2-132M2-6 (5.5 kW) generates 69 dB(A). The lower shaft speed means the external cooling fan rotates at approximately two-thirds of the speed of a comparable 4-pole motor fan, substantially reducing aerodynamic fan noise. Electromagnetic noise from slot passing frequency is also lower due to the reduced frequency of pole transitions per revolution.

Can I use a 6-pole Y2 motor with a variable frequency drive?

Standard Y2 motors can be operated with a VFD for limited speed range applications (typically 50–100% of rated speed). For full variable speed operation from near-zero to rated speed under constant torque, the YVF2 series inverter duty motor is recommended. The YVF2 uses an independent IC416 external cooling fan that maintains full airflow regardless of shaft speed, preventing overheating at low operating frequencies. It shares the same IEC frame dimensions as the Y2 series.

What is the rated torque of the Y2-160L-6 at 11 kW?

Using the formula Tn = (P × 9550) / n: Tn = (11 × 9550) / 960 = 109.3 N·m. The maximum torque during transient overload is Tmax = Tn × 2.1 = 229.5 N·m. Compare this to the 4-pole equivalent Y2-160M-4 at the same 11 kW rated output, which produces a rated torque of only (11 × 9550) / 1460 = 71.9 N·m — 52% less torque at the same power. This torque difference directly reduces the gearbox input torque and therefore the required gearbox size and cost.

Are 6-pole Y2 motors suitable for hoist and crane applications?

Standard Y2-6-pole motors can drive hoists when combined with a brake motor variant. For hoist duty, we recommend the Y2EJ electromagnetic brake motor series, which shares the same 6-pole IEC frame dimensions and adds a DC electromagnetic disc brake for rapid stopping and load holding when power is removed. The Y2EJ-*-6 brake motor range is specifically designed for hoist, overhead crane, and vertical lift applications requiring both the controlled 960 rpm speed and fail-safe braking.

What is the power factor of Y2 6-pole motors and why is it lower than 4-pole?

The power factor of Y2 6-pole motors ranges from 0.66 (frame 71, 0.18 kW) to 0.87 (frame 315, 132 kW) at rated load. 6-pole motors have a lower power factor than equivalent 4-pole motors because the longer pole pitch requires a deeper and wider air gap, increasing the magnetizing current needed to establish the rotating magnetic field. This magnetizing current is reactive and does not contribute to useful mechanical output, lowering the overall power factor. For installations with power factor correction requirements, capacitor banks can compensate for reactive current at the motor terminals.

What is the minimum order quantity and lead time for Y2 6-pole motors?

Standard 6-pole frames from 80M through 160L are typically available from stock or with 2–4 week production lead time for small quantities. Frames 180L and above may require 4–8 weeks. There is no minimum order quantity for standard catalog models. Volume pricing applies for orders of 10 units and above per model. Contact our team with your model number and quantity for current availability and pricing.