YE3/IE3 Premium Efficiency AC Gear Motor | Three Phase Motor

Product Overview

The YE3 (IE3 Premium Efficiency) series represents the current mainstream high-efficiency standard for industrial squirrel-cage three phase motors under IEC 60034-30-1. It sits one tier above the IE2 High Efficiency level and one tier below the IE4 Super Premium level — a practical middle ground that delivers meaningful energy savings over legacy motors without the price premium of the top efficiency class. The power range covers 0.12 kW through 315 kW in 2-pole and 4-pole configurations, with rated voltages available at 380 V, 400 V, and 415 V.

YE3 motors are built on high-strength cast-iron housings with Class F insulation (155 °C thermal rating), IP55 ingress protection, and IC0141 self-ventilated cooling. The stator uses cold-rolled silicon steel laminations with optimized slot geometry to reduce core losses, while the copper content in the winding is increased compared to IE2 designs to cut resistive (I²R) losses. These engineering improvements add up to 1 to 3 percentage points of efficiency gain over IE2 at every load point — and those percentage points compound into thousands of kWh saved annually on motors running 4 000+ hours per year.

For Korean manufacturers who are upgrading from older Y or Y2 series motors, the YE3 provides the best balance of efficiency improvement and purchase cost. All frame sizes conform to IEC 60072 mounting dimensions, making the YE3 a direct bolt-in replacement for any existing IEC-standard AC 기어 모터. The efficiency gains comply with Korea's tightening energy performance standards and support corporate carbon-reduction reporting targets.

Operating Conditions

• Ambient temperature: −15 °C to +40 °C
• Altitude: Not exceeding 1 000 m (derate above 1 000 m)
• Rated voltage: 380 V, or any voltage between 220–760 V on request
• Rated frequency: 50 Hz / 60 Hz
• Protection class: IP55
• Insulation class: F (155 °C), H (180 °C) available on request
• Cooling method: IC0141 (shaft-mounted fan, self-ventilated)
• Duty: S1 (continuous)
• Connection: Star-connection (Y) for ≤3 kW; delta-connection (Δ) for >3 kW

Technical Specifications

The following table provides performance data for all YE3/IE3 models at three common supply voltages. The efficiency column shows rated, 75 %, and 50 % load efficiency values — a feature particularly useful for applications that run at partial load for extended periods, since motor efficiency typically peaks between 75 % and 100 % of rated output.

Note: The 4-pole data section continues beyond the models shown above. For the complete 4-pole, 6-pole, and 8-pole specification tables, please contact our engineering team at [email protected].

Installation Dimention

 

Energy Savings Analysis: IE3 vs IE2 and IE1

The financial case for IE3 motors depends on operating hours. A motor that runs only 2 000 hours per year may not pay back its price premium within the warranty period. A motor running 6 000+ hours per year almost certainly will. The table below illustrates annual electricity savings for three common motor sizes, comparing IE3 to IE2 and IE1 at Korean industrial electricity rates (approximately 100–120 KRW/kWh).

For a plant running 20 motors of 22 kW at 6 000 hours per year, replacing IE1 units with IE3 saves roughly 110 000 kWh annually — equivalent to 13 million KRW or more, depending on the tariff tier. The payback period on the motor price premium is typically 18 to 30 months.

Core Advantages

Application Scenarios

Centrifugal Pumps and Fans

Continuous-duty centrifugal loads are the ideal application for IE3 motors because they run at or near rated load for thousands of hours per year. The efficiency improvement translates directly into lower electricity bills. YE3 motors in the 7.5 to 75 kW range are the most popular choices for HVAC supply fans, cooling tower motors, and industrial water transfer pumps in Korean manufacturing plants.

Conveyor Systems

Belt conveyors, roller conveyors, and screw conveyors in warehousing, food processing, and bulk-material handling run motors at varying loads throughout the shift. The YE3's high part-load efficiency (75 % and 50 % values published for every model) means it maintains good performance even when the conveyor runs lightly loaded between production peaks.

Machine Tools and Compressors

CNC lathes, milling machines, and air compressors demand reliable starting torque and stable running speed. The YE3 locked-rotor torque ratio (Tst/Tn) of 2.2 to 2.3 times on most models ensures confident starting under load, while the maximum torque ratio (Tmax/Tn) of 2.0 or higher provides margin for transient overloads.

 

Quality Certifications and Warranty

Each YE3 motor ships with a factory test report documenting measured efficiency, current, speed, and temperature rise at rated load. Additional credentials include ISO 9001:2015 quality management certification, CE marking for European export markets, and CCC certification for Chinese domestic compliance. RoHS declarations are available on request. Our standard warranty covers 18 months from shipment date. Spare parts — bearings, fan assemblies, terminal blocks — are stocked at our Korean depot for overnight delivery.

Related and Complementary Products

Pair the YE3 with a planetary gearbox for coaxial, high-efficiency speed reduction, or a worm gear reducer for right-angle output and self-locking applications. For conveyor and agricultural drives, sprocket and chain sets provide reliable, low-maintenance power transmission. If you need even higher efficiency, consider upgrading to the YE4/IE4 super premium efficiency AC gear motor from the same product family.

Frequently Asked Questions

What is the actual difference between IE2 and IE3?
At the component level, IE3 motors use thinner, lower-loss electrical steel laminations, more copper in the winding (reducing I²R losses), and tighter manufacturing tolerances on the air gap. The result is a 1 to 3 percentage point efficiency improvement at rated load, depending on the frame size. Larger motors have a smaller absolute gap because their baseline efficiency is already high.

Can the YE3 start direct-on-line?
Yes. All models support DOL starting. The Ist/In ratio (locked-rotor current divided by rated current) is listed in the specification table — use it to verify that your supply transformer and protection devices can handle the inrush. Star-delta or soft starters can be used if the inrush is too high for your supply.

Is the YE3 compatible with variable frequency drives?
The standard YE3 uses IC0141 self-ventilated cooling, which depends on rotor speed. Running below 25 Hz for extended periods reduces cooling airflow and may cause overheating. For sustained low-speed VFD operation, specify the YVF2 variant with IC416 independent cooling fan, or fit an external blower to the YE3.

Are the frame dimensions the same as the older Y2 series?
Yes. The YE3 follows IEC 60072 mounting dimensions. Frame sizes, shaft heights, foot hole patterns, and flange dimensions are identical to the Y2 and YE2 series. The YE3 is a direct bolt-in replacement with no mechanical modifications needed.

What efficiency data do you publish — rated load only?
We publish efficiency at three load points: 100 %, 75 %, and 50 % of rated output. This is important because many motors in real installations run at 60 to 80 % of their nameplate rating. The 75 % load efficiency is often the most representative figure for total cost-of-ownership calculations.

Do you offer volume pricing for fleet replacement orders?
Yes. Orders of 10 or more units receive project pricing. We also assign a dedicated logistics coordinator for fleet orders to manage production scheduling, staggered delivery windows, and on-site delivery sequencing. Contact our sales team at acgearmotor.top for a fleet quotation.

Customer Reviews

Lee Min-ho, Facility Engineer, Incheon (early 2025)
"We upgraded 22 fan motors from Y2 to YE3 across two AHU plants. Measured current dropped by 5 to 8 % on each unit. The motors run cooler and quieter. Our energy management system confirmed a 6.5 % reduction in total fan electricity consumption for the quarter."

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Cho Eun-ji, Production Manager, Chungcheong-do (mid 2024)
"Packaging line application. We replaced 6 conveyor motors with YE3-100L-4 units. Installation was a straight swap — same bolt pattern, same shaft size. Production resumed within half a day. No issues after 11 months of continuous two-shift operation."

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Yoon Sang-cheol, Maintenance Supervisor, Gyeonggi-do (late 2024)
"We needed a 30 kW pump motor fast. The European supplier quoted 8 weeks. Korea Cyclo delivered the YE3-200L1-4 in 12 days. The efficiency test report came with the motor. Our calibration team verified the numbers on our dynamometer — within 0.2 % of the catalog value."

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Baek Ji-won, Procurement Specialist, Seoul (early 2025)
"We compared five suppliers for a 15-motor fleet order. Korea Cyclo's YE3 pricing was 35 % below the European equivalent at the same IE3 specification. Delivery was 14 days, packaging was solid, and the CE paperwork was complete. We have reordered twice since."

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Kang Tae-yeon, Plant Director, Ulsan (mid 2025)
"Chemical plant duty. The YE3-132S2-4 drives a solvent transfer pump 20 hours per day. Bearing temperature is stable at 62 °C after 9 months. The factory test report accurately predicted the operating current. We are planning to replace 8 more motors in the next turnaround."

Packing and Shipping