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Product Overview
IE3 4 Pole Motor refers to a three-phase asynchronous induction motor with 4 poles, built to the IE3 Premium Efficiency class. When three-phase power is applied to the stator winding, it creates a rotating magnetic field at a synchronous speed of 1,500 rpm on a 50 Hz supply (120 x frequency divided by number of poles). The squirrel-cage rotor follows that field with a small slip, so the shaft turns at 1,400 to 1,490 rpm at rated load rather than exactly 1,500 rpm.
Inside the YE3 series design, the stator core is stacked from low-loss silicon steel laminations and wound with copper wire under Class F insulation. The rotor carries cast aluminium bars, and the totally enclosed, fan-cooled frame (IP55) keeps dust and water spray away from the windings. IE3 efficiency comes from lower iron and copper losses than IE2 motors, which typically means around 15 to 20 percent less wasted energy and a cooler-running winding.
In practice, four-pole machines are known for the most widely used pole count, balancing speed, torque, frame size and price better than any other. Because it is the default choice for most catalogues, check the frame, flange and shaft details against your equipment drawing rather than assuming a match.
Main points for buyers
- 1Confirm the efficiency class. Check the IE3 marking and ask for efficiency at 100, 75 and 50 percent load, not only the class label.
- 2Match rated speed, not only pole count. A small slip difference changes fan and pump power noticeably.
- 3Check the mechanical interface. Compare frame size, mounting (B3, B5 or B35), shaft diameter and flange with the driven equipment drawing.
- 4Lock down the electrical data. Confirm voltage, frequency and terminal connection before ordering, because special windings take longer than standard ones.
- 5Request the paperwork. Ask for CE and CCC documents, nameplate data and test reports so customs and your own customers have no questions.
When comparing quotations for IE3 4 Pole Motor, look beyond the ex-works price. Rated power and frame size set the material content, while copper and silicon steel prices move the figure from month to month. Special voltage, 60 Hz windings, a higher protection class, brakes or encoders add cost, as do test reports and OEM packaging. Order quantity, container loading, sea freight, import duty and local VAT then decide the landed cost per unit, so ask each supplier to quote on the same Incoterm and the same rating.
Typical specification of the IE3 4 Pole Motor. Values are standard offers; ratings, voltage and options can be adjusted to your order.
| Parameter | Standard Offer | Customization Options |
| Product type | Three-phase asynchronous induction motor, squirrel-cage rotor | ODM design from your working conditions |
| Model series | YE3 series | Private-label model name on the nameplate |
| Efficiency class | IE3 Premium Efficiency (IEC 60034-30-1) | Efficiency test report with the shipment on request |
| Number of poles | 4 | Not applicable, pole count fixed per model |
| Synchronous speed at 50 Hz | 1,500 rpm | Other pole counts available as separate models |
| Rated speed at 50 Hz | 1,400 to 1,490 rpm | Depends on power rating and supply frequency |
| Power range | 0.75 to 355 kW | Other ratings on request |
| Frame size | 80 to 355 | Special shaft or flange dimensions on request |
| Rated voltage | 380 V, 400 V or 415 V, three-phase | 220 V to 690 V and other voltages on request |
| Frequency | 50 Hz | 60 Hz winding and nameplate |
| Protection class | IP55 | IP56 or IP65 on request |
| Insulation and temperature rise | Class F insulation, Class B temperature rise | Class H insulation and thermistors on request |
| Duty type | S1 continuous | S2 to S8 on request after thermal check |
| Cooling method | IC411, totally enclosed fan-cooled | IC416 separate fan for VFD operation |
| Mounting | B3, B5 and B35 | V1 and other mounting forms |
| Housing material | Cast iron frame and end shields for most ratings | Aluminium frame on small ratings on request |
| Ambient and altitude | Minus 15 to plus 40 degrees C, up to 1,000 m | Higher altitude or temperature with derating |
| Options | Standard motor without options | Brake, encoder, space heater, explosion-proof, VFD-ready design |
| Certification and quality system | ISO9001, China CCC, EU CE | Inspection and test documents on request |
| Nameplate, color and packaging | Standard nameplate, standard color, export carton | OEM nameplate, RAL color, wooden case |
Final values for a given rating are confirmed on the datasheet issued with your quotation.
Application
The IE3 4 Pole Motor is used wherever a reliable, efficient three-phase drive is needed. The sections below cover typical industries, buyer types, selection and day-to-day use.
Application Scenarios
| Industry | Typical Equipment | Why It Fits |
| Conveying and lifting | Belt conveyors with gear reducers, winches, hoist auxiliaries | A standard 1,500 rpm input matches most gearbox ratings |
| Pump and HVAC | End-suction pumps, cooling water pumps, fans | Balanced torque and speed suit the widest range of pump curves |
| Mining and port machinery | Feeders, crusher auxiliaries, bulk-handling equipment | Robust continuous duty with common mounting sizes for easy replacement |
| Textile and machine tools | Spinning, weaving and machining drives | Stable speed and low vibration support repeatable output |
| Export machinery and OEM equipment | Machines shipped to markets that require IE3 motors | Meeting the minimum efficiency level avoids redesign and customs questions |
Target Customers
Suitable and Unsuitable Uses
- General-purpose drives for pumps, fans, conveyors and gearboxes
- Replacing standard 4-pole units in existing equipment
- Projects that need wide spare-part and distributor availability
- Loads that need more than 3,000 rpm without a gearbox
- Direct drive of very slow equipment below 800 rpm
- Frequent start-stop duty beyond the thermal limit of an S1 rating
Selection Guidance
- 1Define the load. Set required shaft power, starting torque and duty cycle before looking at models.
- 2Choose the speed or type. Use 4-pole as the default when the load has a gearbox or follows standard pump and fan curves. Confirm frame, flange and shaft dimensions against the driven equipment before ordering.
- 3Set the environment. Note ambient temperature, altitude, dust, moisture and whether IP55 or higher is needed.
- 4Fix the interface. Confirm voltage, frequency, mounting type, shaft size and the documents your market requires.
Usage Notes
- Compare supply voltage and frequency with the nameplate before connecting, and stay within plus or minus 5 percent voltage.
- Check that the star or delta connection matches the nameplate and the supply.
- Measure insulation resistance before the first start, and again after long storage or damp conditions.
- Align the coupling or set belt tension correctly, since misalignment is a leading cause of early bearing failure.
- Keep the fan cover clear and leave space for airflow around the frame.
- Re-check the driven machine speed after a replacement: a motor with lower slip runs slightly faster than an older, less efficient unit.
- Fit overload and thermal protection, and respect the permitted number of starts per hour.
