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Product Overview
This guide covers how Premium (IE3) and Super Premium (IE4) three-phase induction motors are applied across industry. Both classes use the same squirrel-cage principle and IEC frames, so the choice depends on running hours, duty and local rules rather than on mechanical fit.
IE3 suits general machinery with moderate running hours and markets that require Premium Efficiency. IE4 suits pumps, fans and compressors that run most of the year, where lower losses repay the higher price. IE3 efficiency comes from lower iron and copper losses than IE2 motors, and IE4 goes a step further with better core steel, more copper in the slot, tighter air-gap control and lower fan and friction losses, cutting losses by roughly another 15 to 20 percent.
Application also decides pole count: 2-pole for fans, compressors and machine tools, 4-pole for general drives with gearboxes, 6-pole for low-noise ventilation and mixers, and 8-pole for slow direct-drive loads.
Main points for buyers
- 1Confirm the efficiency class. Check the IE3 / IE4 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 and IE4 motors, 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 IE3 and IE4 motors. 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 and YE4 series | Private-label model name on the nameplate |
| Efficiency class | IE3 Premium and IE4 Super Premium Efficiency (IEC 60034-30-1) | Efficiency test report with the shipment on request |
| Number of poles | 2, 4, 6 or 8 | Pole count selected per order |
| Synchronous speed at 50 Hz | 3,000 to 750 rpm (2 to 8 poles) | Specify the pole count with the order |
| Rated speed at 50 Hz | 690 to 2,980 rpm depending on poles | Depends on power rating and supply frequency |
| Power range | 0.75 to 355 kW (IE3), 0.75 to 160 kW (IE4) | Other ratings on request |
| Frame size | 80 to 355 (IE3), 80 to 315 (IE4) | 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
IE3 and IE4 motors are 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 |
| Pump and HVAC | Water pumps, booster sets, air-handling fans | Long running hours make efficiency gains visible on the energy bill |
| Compressors and blowers | Screw compressors, roots blowers, vacuum pumps | Steady load and high duty cycle suit premium-efficiency motors |
| Conveying and material handling | Belt conveyors, feeders, screw conveyors | Standard IEC frame sizes fit common gearboxes and reducers |
| Mining and quarrying | Crushers, screens, ventilation fans | Continuous S1 duty and an IP55 enclosure handle dust and shock |
| Chemical processing | Agitators, process pumps, exhaust fans | Enclosed construction and Class F insulation for long continuous running |
Target Customers
Suitable and Unsuitable Uses
- Buyers who stock one range for markets with different efficiency requirements
- Projects that compare IE3 and IE4 payback before choosing
- Machinery makers that offer both a standard and a premium model
- Rarely used equipment where efficiency makes little difference
- Explosive atmospheres unless an explosion-proof version is specified
- Special torque or speed profiles not checked with our engineers
Selection Guidance
- 1Define the load. Set required shaft power, starting torque and duty cycle before looking at models.
- 2Choose the speed or type. Match the class to running hours, the pole count to the driven speed and the enclosure to the environment. Our engineers can propose a model if you send load and site details.
- 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.
- Check the real operating point of the driven machine, since a lightly loaded motor loses efficiency and power factor.
- Fit overload and thermal protection, and respect the permitted number of starts per hour.
