Three-Phase Induction Motors – IE3 IE4 Premium Efficiency Industrial Electric Motor
Y2/YE3/YE4 Series Three-Phase Induction Motor Overview
The Y2, YE3, and YE4 series industrial electric motors manufactured by Korea Ever-Power represent our core product line for general-purpose drive applications. Built on IEC standard frame dimensions from size 63 through 355, these motors provide direct dimensional interchangeability with major international brands including ABB, Siemens, WEG, and Leroy-Somer.
Our YE3 series meets IE3 (Premium Efficiency) requirements per IEC 60034-30-1, while the YE4 series achieves IE4 (Super Premium Efficiency) classification. Both lines comply with the European Union ErP Directive 2019/1781, making them suitable for installation in EU member states without additional efficiency documentation.
Motor housings are available in die-cast aluminum alloy (frames 63 through 160) or high-grade cast iron (frames 160 through 355). All motors feature F-class insulation rated to 155°C with temperature rise assessed at B-class (80K), providing a substantial thermal safety margin for continuous duty (S1) operation.
Technical Specifications
The following table summarizes the principal technical parameters for our three-phase induction motor range. All values are based on rated conditions at 380V, 50Hz supply with ambient temperature of 40°C and altitude below 1,000 meters.
| Parameter | Specification |
|---|---|
| Motor Series | Y2 (IE1/IE2), YE3 (IE3), YE4 (IE4) |
| Power Range | 0.06 kW – 315 kW (0.08 HP – 420 HP) |
| IEC Frame Sizes | 63M, 71M, 80M, 90S/L, 100L, 112M, 132S/M, 160M/L, 180M/L, 200L, 225S/M, 250M, 280S/M, 315S/M/L, 355M/L |
| Number of Poles | 2-pole (3000 rpm), 4-pole (1500 rpm), 6-pole (1000 rpm), 8-pole (750 rpm) at 50Hz |
| Rated Voltage | 380V (standard), 400V, 415V, 440V, 460V, 660V available |
| Rated Frequency | 50Hz (standard), 60Hz available |
| Efficiency Class | Y2: IE1/IE2 per IEC 60034-30-1; YE3: IE3; YE4: IE4 |
| Insulation Class | Class F (155°C), temperature rise assessed at Class B (80K) |
| Protection Class | IP55 (dust-tight, water jet protected from all directions) |
| Cooling Method | IC411 (totally enclosed fan cooled, TEFC) |
| Duty Rating | S1 (continuous duty) |
| Mounting Types | IM B3 (foot), IM B5 (flange), IM B14 (face), IM B35 (foot + flange), IM V1 (vertical) |
| Housing Material | Aluminum alloy ADC12 (frame 63–160); Cast iron HT200/HT250 (frame 160–355) |
| Rotor Material | Die-cast aluminum squirrel cage rotor, dynamically balanced to G6.3 |
| Stator Core | Cold-rolled silicon steel laminations, 0.5mm thickness, low iron loss grade |
| Bearing Type | Deep groove ball bearings (e.g., 6205-2RS, 6208-2RS), L10 life ≥ 20,000 hours |
| Noise Level | ≤ 68 dB(A) at 1 meter (4-pole, frame 132 and below) |
| Vibration Grade | ≤ 1.8 mm/s (frame 63–132); ≤ 2.8 mm/s (frame 160–355) |
| Ambient Temperature | -15°C to +40°C (special winding available for -40°C or +60°C) |
| Connection | Δ (delta) for ≤ 3 kW; Y (star) for ≥ 4 kW at 380V |
| Standards Compliance | IEC 60034, GB/T 755, GB 18613-2020, EU ErP Directive 2019/1781 |
Available Mounting Configurations
All three-phase induction motors from Korea Ever-Power are available in multiple IEC-standard mounting configurations. The mounting type is specified by the IM code on the motor nameplate. The most common configurations are shown below:
IM B3 — Foot Mount
Horizontal foot-mounted, most common configuration for floor or base plate installation
IM B5 — Flange Mount
Large flange with plain holes, direct coupling to pumps, gearboxes, and fans
IM B14 — Face Mount
Small flange with threaded holes, ideal for gearmotor and reducer coupling
IE3 vs IE4 Energy Efficiency Comparison
Selecting the correct efficiency class directly affects long-term energy costs. The table below compares actual measured efficiency values for our YE3 (IE3) and YE4 (IE4) motors at 4-pole, 50Hz operation. For facilities running motors continuously, upgrading from IE2 to IE3 typically pays for itself within 12 to 18 months through reduced electricity consumption.
| Rated Power (kW) | Y2 / IE2 (%) | YE3 / IE3 (%) | YE4 / IE4 (%) | Annual Savings vs IE2 |
|---|---|---|---|---|
| 0.75 | 77.4 | 80.7 | 83.5 | ~$85/yr |
| 4.0 | 83.8 | 86.6 | 89.1 | ~$310/yr |
| 7.5 | 86.7 | 89.1 | 91.4 | ~$490/yr |
| 15 | 89.2 | 91.2 | 93.0 | ~$830/yr |
| 30 | 91.4 | 92.9 | 94.3 | ~$1,250/yr |
| 55 | 92.6 | 93.9 | 95.0 | ~$1,980/yr |
| 110 | 93.7 | 95.0 | 95.8 | ~$3,960/yr |
Annual savings calculated at 8,000 operating hours per year with electricity cost of $0.10/kWh. Actual savings depend on local energy rates and operating conditions.
Features and Engineering Advantages
High-Efficiency Stator Design
Stator cores are assembled from 0.5mm cold-rolled silicon steel laminations with optimized slot geometry. This design reduces iron core losses by 15–20% compared to conventional Y-series motors. Each stator undergoes automated winding with Class F enameled copper wire, vacuum pressure impregnation (VPI), and high-voltage dielectric testing at 1,500V + 2 × rated voltage.
Precision-Balanced Rotor
All rotors are die-cast aluminum in a single shot for uniform conductor bar quality. Each rotor assembly is dynamically balanced to ISO 1940 grade G6.3 (G2.5 available on request). This ensures vibration levels below 1.8 mm/s for frame sizes up to 132 and below 2.8 mm/s for frames 160 through 355, measured at no-load condition.
Enhanced Heat Dissipation
The motor housing features parallel and vertical radiating fins cast directly into the frame. This dual-direction fin pattern increases the effective cooling surface area by approximately 25% over conventional single-direction designs. Combined with the external fan (IC411 cooling), operating temperatures remain within safe limits even at sustained full-load conditions.
Low Noise and Vibration
Pre-lubricated deep groove ball bearings (ZZ or 2RS shielded type) with L10 rated life exceeding 20,000 hours contribute to smooth, quiet operation. The fan cover is aerodynamically shaped to reduce airflow turbulence noise. Measured sound pressure levels are typically 61–68 dB(A) at 1 meter distance for 4-pole motors in frame sizes 63 through 132.
IEC Dimensional Interchangeability
All mounting dimensions, shaft diameters, key sizes, and flange bolt patterns conform strictly to IEC 60072-1. This allows our motors to serve as direct drop-in replacements for ABB M3BP, Siemens 1LE1/SIMOTICS GP, WEG W22, and Nord SK series without any modification to the existing installation base plate or coupling arrangement.
Corrosion-Resistant Surface Treatment
Motor housings receive a three-layer surface treatment: phosphating primer, epoxy-based anti-corrosion intermediate coat, and polyurethane topcoat (RAL 5010 standard). This coating provides salt spray protection for a minimum of 500 hours per ISO 9227, making the motor suitable for coastal and moderately corrosive industrial environments.
Industry Applications
Three-phase induction motors are the most widely used type of electric motor in industrial and commercial installations worldwide. Our Y2/YE3/YE4 series motors are actively serving the following sectors:
HVAC and Water PumpingCentrifugal pumps, AHU fans, chilled water systems, cooling tower fans. 4-pole motors from 2.2 kW to 110 kW are the standard choice. |
Food and Beverage ProcessingConveyor drives, mixers, fillers, packaging lines. For washdown areas, pair with our stainless steel IP69K motors. |
Mining and Material HandlingBelt conveyors, crushers, vibrating screens, bucket elevators. Cast iron housings recommended for 30–315 kW applications. |
Chemical and PetrochemicalReactor agitators, transfer pumps, compressors. For hazardous zones, see our explosion-proof motor range. |
Textile and SpinningSpinning frames, looms, dyeing machines. Low-vibration 6-pole motors preferred to prevent yarn breakage on high-speed lines. |
Printing and PackagingWeb presses, winders, coating machines. For precise speed control, pair with a VFD or choose our YVF inverter-duty motors. |
Cross-Reference Replacement Guide
Our three-phase induction motors follow IEC 60072-1 standard dimensions, making them direct replacements for the following international motor families. No modifications to the mounting base, coupling, or electrical connections are required when replacing like-for-like frame sizes and power ratings.
| Brand | Motor Series | Korea Ever-Power Replacement | Frame Compatibility |
|---|---|---|---|
| ABB | M3BP, M2BA, M3AA | YE3 / YE4 Series | IEC 71–355, identical bolt pattern |
| Siemens | 1LE1, SIMOTICS GP, 1LA7 | YE3 / YE4 Series | IEC 71–315, identical shaft |
| WEG | W22, W21 | YE3 / YE4 Series | IEC 63–355, direct swap |
| Leroy-Somer | LSMV, FLSES | YE3 / YE4 Series | IEC 80–315, matching flange |
| Nord Drivesystems | SK 200E, SK 700E | YE3 / YE4 Series | IEC 71–280, same key slot |
Installation Guidelines
Proper installation is essential for motor longevity and performance. Follow these steps when installing a Korea Ever-Power three-phase induction motor:
Inspect the motor upon delivery for transportation damage. Verify the nameplate data matches the purchase order including power rating, voltage, frequency, and frame size. Rotate the shaft by hand to confirm free movement.
Prepare a rigid, flat, and level mounting surface. For foot-mounted (IM B3) motors, use shims if necessary to achieve alignment within 0.05 mm across the mounting feet. Anchor bolts should be grade 8.8 or higher.
Align the motor shaft with the driven equipment using a dial indicator or laser alignment tool. Maximum allowable parallel misalignment is 0.05 mm and angular misalignment is 0.03 mm per 100 mm of coupling span.
Connect the power cables to the terminal box according to the wiring diagram. For 380V supply: motors rated 3 kW and below use delta connection; motors rated 4 kW and above use star connection. Verify the phase sequence for correct rotation direction.
Measure insulation resistance between windings and frame using a 500V megohmmeter before first energization. Minimum acceptable reading is 5 MΩ for new motors.
Perform a test run at no-load for a minimum of 30 minutes. Monitor vibration, bearing temperature, and current draw. Bearing temperature should stabilize below 95°C. If all readings are satisfactory, proceed to connect the driven load.
Maintenance Requirements
Bearings in our standard motors are pre-lubricated with lithium-based grease (Shell Gadus S2 V100 2 or equivalent) and sealed for maintenance-free operation for the first 10,000 to 15,000 running hours under normal conditions. Re-greasing intervals by frame size:
Frame 63 through 132: Re-grease every 10,000 hours or 2 years (whichever comes first)
Frame 160 through 225: Re-grease every 8,000 hours or 18 months
Frame 250 through 355: Re-grease every 5,000 hours or 12 months
Inspect the fan cover for debris accumulation every 3 months. Clean the cooling fins with compressed air to maintain thermal performance. Check terminal box connections for tightness annually. Measure insulation resistance at least once per year and record the readings for trend analysis.
Frequently Asked Questions
What is a three-phase induction motor and how does it work?
A three-phase induction motor converts electrical energy into mechanical rotational energy using electromagnetic induction. When three-phase alternating current flows through the stator windings, it creates a rotating magnetic field that induces current in the rotor conductors, generating torque. The rotor turns slightly slower than the magnetic field — this difference is called slip and is typically 2–5% at full load.
How do I determine the correct motor size for my application?
Calculate the required shaft power based on load characteristics (flow/head for pumps, speed/weight for conveyors). Add a 10–15% safety margin, then select the motor with the matching frame size, pole count, and voltage rating. Contact our engineering team for free motor sizing assistance with your specific parameters.
Can a three-phase motor run on single-phase power?
A three-phase motor cannot run directly on single-phase power. However, it can be operated from a single-phase supply using a variable frequency drive (VFD) that converts single-phase input to three-phase output. This approach works well for motors up to approximately 5.5 kW.
What does IP55 protection rating mean?
IP55 is an Ingress Protection rating per IEC 60529. The first digit (5) means complete dust protection. The second digit (5) means protection against water jets from any direction. IP55 motors are suitable for indoor and outdoor use in most industrial environments except submersion or high-pressure washdown.
Why is IE3 efficiency mandatory in the European Union?
EU Regulation 2019/1781 mandates IE3 minimum for motors 0.75–200 kW. Since July 2023, motors 75–200 kW must meet IE4. This targets industrial electricity consumption, which accounts for approximately 70% of total EU industrial energy use.
How often should bearings be replaced?
Under normal conditions, L10 bearing life exceeds 20,000 hours (approximately 2.5 years continuous or 5+ years single-shift). Replace bearings when vibration exceeds 4.5 mm/s or bearing temperature rises 15°C above historical baseline.
What is the difference between 2-pole and 4-pole motors?
Pole count determines speed. At 50 Hz: 2-pole runs at approximately 2,900 rpm (for pumps and compressors), 4-pole at 1,450 rpm (most common for general drives), 6-pole at 960 rpm (low-speed applications), and 8-pole at 720 rpm.
Can your motors be used with a variable frequency drive?
Yes. Standard Y2/YE3/YE4 motors support basic VFD operation within 30–60 Hz. For wide speed range, frequent starts, or operation below 20 Hz, our YVF inverter-duty motor series with H-class insulation and independent cooling is recommended.
What is the minimum order quantity and lead time?
No strict minimum order. We accept from 1 unit for evaluation, with volume pricing from 10 units. Standard models ship in 7–15 business days. Custom specifications typically require 25–35 days.
Do you provide replacements for ABB or Siemens motors?
Yes. Our IEC-standard motors are direct dimensional replacements for ABB M3BP, Siemens 1LE1/SIMOTICS, WEG W22, and Leroy-Somer LSMV. We provide cross-reference tables for frame, shaft, and mounting compatibility verification.
Customer Experiences
We switched to Korea Ever-Power YE3 series on our water treatment pump station. The 45 kW 4-pole motors have been running 24/7 for nine months without a single issue. Energy monitoring confirmed a 2.1% reduction in electricity consumption compared to the previous IE2 motors. Delivery to our Sydney warehouse took only 18 days.
Mark T., Maintenance Supervisor
Municipal Water Treatment Plant, Sydney, Australia
Our textile mill needed 60 motors in frame sizes 90L through 132M for our spinning line upgrade. The Ever-Power team provided a detailed cross-reference table matching our existing dimensions. All 60 units dropped into the existing mounting bases without any modification. Vibration readings averaged 1.2 mm/s compared to 2.4 mm/s on the old units.
Suresh K., Plant Engineer
Textile Manufacturing Group, Coimbatore, India
We specified YE4 IE4 motors for a new cement plant conveyor system requiring 22 kW and 37 kW 4-pole drives. After 14 months of operation in a dusty, high-temperature environment (ambient 38°C), all motors continue to perform within their rated specifications. Professional export packaging was also appreciated.
Omar A., Project Director
Cement Manufacturing, Jeddah, Saudi Arabia
As an OEM packaging machine manufacturer, we needed consistent quality across hundreds of units per year. Korea Ever-Power has supplied us with YE3 1.5 kW and 2.2 kW motors for two years now. Zero failures across 400+ units delivered. Custom nameplate branding was a significant advantage for our machines.
Thomas B., Purchasing Director
Packaging Machinery OEM, Stuttgart, Germany
We operate 200+ centrifugal pumps across three wastewater plants. Replacing failed motors used to take 6–8 weeks with our previous supplier. Since sourcing from Korea Ever-Power, replacement motors arrive in 10–12 days. IEC frame dimensions match exactly, so our technicians complete a motor swap in under 3 hours including alignment.
Ricardo M., Operations Manager
Water Utility Company, São Paulo, Brazil
Important Technical Note
Specifications listed on this page are based on standard catalog values at rated conditions (380V, 50Hz, 40°C ambient, altitude below 1,000m). Actual motor performance may vary depending on supply voltage tolerance, load characteristics, ambient conditions, and installation quality. For applications outside standard conditions, please contact our engineering team for a detailed performance calculation. All data conforms to IEC 60034, GB/T 755, and GB 18613-2020 standards.
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Additional information
| Editor | Cxm |
|---|