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Product Overview
IE4 8 Pole Motor refers to a three-phase asynchronous induction motor with 8 poles, built to the IE4 Super Premium Efficiency class. When three-phase power is applied to the stator winding, it creates a rotating magnetic field at a synchronous speed of 750 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 690 to 740 rpm at rated load rather than exactly 750 rpm.
Inside the YE4 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. IE4 goes a step further with better-grade core steel, more copper in the slot, tighter air-gap control and reduced fan and friction losses, so waste heat is again roughly 15 to 20 percent lower than IE3.
In practice, eight-pole machines are known for low speed and high torque for direct drive of slow machinery. It also has the largest frame and the lowest power factor per kilowatt in the range, so compare total installed cost with a 4-pole motor plus gearbox.
Main points for buyers
- 1Confirm the efficiency class. Check the 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 IE4 8 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 IE4 8 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 | YE4 series | Private-label model name on the nameplate |
| Efficiency class | IE4 Super Premium Efficiency (IEC 60034-30-1) | Efficiency test report with the shipment on request |
| Number of poles | 8 | Not applicable, pole count fixed per model |
| Synchronous speed at 50 Hz | 750 rpm | Other pole counts available as separate models |
| Rated speed at 50 Hz | 690 to 740 rpm | Depends on power rating and supply frequency |
| Power range | 0.75 to 90 kW | Other ratings on request |
| Frame size | 80 to 315 | 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 IE4 8 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 |
| Cooling and ventilation | Cooling tower fans, large low-speed fans | Around 740 rpm allows direct drive without belts or a gearbox |
| Pumps and slurry handling | Slurry pumps, large-bore water pumps | Low speed reduces wear on impellers and seals |
| Mining and heavy machinery | Crushers, slow conveyors, ball-mill auxiliaries | High torque per revolution for heavy, slow loads |
| Chemical and port equipment | Heavy agitators, slow-speed mixers, handling equipment | Reliable low-speed drive where a gearbox is hard to maintain |
| Long-running continuous plants | Pumping stations, ventilation systems, compressors that run most of the year | Lower losses cut energy cost over thousands of operating hours |
Target Customers
Suitable and Unsuitable Uses
- Direct drive of large low-speed fans and cooling tower fans
- Slow, heavy loads where a gearbox adds maintenance
- Slurry and large-bore pumps designed for about 740 rpm
- Small, light loads where a 4-pole motor with a gearbox costs less overall
- Compact installations with strict size and weight limits
- Applications that depend on high power factor at partial load
Selection Guidance
- 1Define the load. Set required shaft power, starting torque and duty cycle before looking at models.
- 2Choose the speed or type. Choose 8-pole for direct drive of slow loads at about 740 rpm. Compare total installed cost with a 4-pole motor plus gearbox, including space, maintenance and energy.
- 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.
- Match the starting method to the load inertia; low-speed motors can draw high starting current relative to rating, so use a soft starter or drive when needed.
- Fit overload and thermal protection, and respect the permitted number of starts per hour.
