4HP Three Phase Motor
What is a 4HP Three Phase Motor?
The 4HP three-phase motor (rated power 3.0KW) is an industrial-grade three-phase asynchronous induction motor built strictly in accordance with IEC international electrical standards and domestic GB standards. It balances high efficiency and energy saving, stable output, and an ultra-long service life, making it a core universal power component for small and medium-sized industrial equipment. This 3.0KW three-phase motor supports dual-band operation at 50Hz/60Hz, is compatible with industrial voltages in many countries worldwide, and features all-pure copper windings, a high-strength cast iron body, an IP55 protection rating, and an F-class insulation rating. It can adapt to complex industrial conditions such as continuous full-load operation and alternating high and low loads. It is widely applicable to fans, pumps, air compressors, machine tools, conveying equipment, agricultural machinery, and light industrial automation equipment, making it a mainstream preferred motor for domestic and international industrial support, cross-border procurement, and equipment modification.







- IP55 high protection, suitable for complex industrial conditions. The entire machine adopts a fully enclosed structure design, with an IP55 dust and water protection rating, which can effectively prevent dust, water vapor, metal shavings, and other impurities from entering the machine body, making it perfectly suitable for harsh industrial environments such as humid, dusty, and open-air ventilation. Equipped with an independent high-power cooling fan and dense ring-shaped heat dissipation fins, the TEFC fully enclosed self-cooling system has excellent heat dissipation efficiency, preventing heat accumulation and overheating shutdowns during long-term high-load operation, and maintaining a stable operating state.
- Low noise and vibration reduction, maintenance-free and long-lasting operation. Utilizing high-precision silent bearings and dynamic balancing technology, the machine experiences minimal vibration during operation, with no-load noise below 72 decibels. Operation is smooth, without jamming or shaking. The high-strength cast iron body is rigid, deformation-resistant, and impact-resistant, with a tight sealing structure that prevents dust and oil leaks. It requires minimal daily maintenance, making it suitable for long-term stable operation in automated unattended production lines, effectively saving on labor and maintenance costs.
- Five rigorous factory quality inspections. Before leaving the factory, each 4HP three-phase motor must undergo five core quality inspection processes: insulation withstand voltage test, no-load operation test, full-load temperature rise test, noise and vibration test, and waterproof and dustproof test. This process eliminates issues such as falsely labeled parameters and defective products leaving the factory, ensuring that the performance of each product meets the standards and that its operational stability, safety, and durability are guaranteed.

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Model |
4HP Three phase motor |
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Frame |
100 |
|
Power |
4 Horse power 3KW |
|
Speed |
3000rpm, 1500rpm, 1000rpm |
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Voltage |
220/380V, 230/400V, or customization |
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Frequency |
50HZ/60HZ |
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Efficiency |
IE1, IE2, IE3, IE4 |
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Motor shaft diameter |
Φ28 |
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Cooling |
Fan |
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Protection |
IP44/IP54/IP55 |
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Housing |
Aluminum/Cast Iron |
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Ambient temperature |
-15℃≤0℃≤40℃ |
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Altitude |
No exceeding 1000 meters |
|
Duty |
S1 |


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Q: How many kilowatts is a 4HP three-phase motor?
A: According to industry-standard conversion, a 4HP industrial three-phase motor has a rated power of 3KW. It is the most commonly used small to medium-power motor in the industrial field and is suitable for the vast majority of small and medium-sized general-purpose mechanical equipment.
Q: What are the differences between cast iron and aluminum alloy 4HP motors, and how should you choose?
A: Cast iron 4HP three-phase motors offer greater rigidity, vibration resistance, impact resistance, and better heat dissipation, making them suitable for heavy-duty, continuous operation, and dusty/humid industrial conditions. Aluminum alloy motors are lighter and have a more refined appearance, but are only suitable for light-duty, intermittent operation equipment.
Q: Is a 4HP three-phase motor suitable for frequency converter applications? Is a frequency converter motor required?
A: This standard 4HP 3.0KW three-phase asynchronous motor is compatible with conventional frequency converters for speed regulation, meeting the speed control requirements of most general-purpose equipment. For applications requiring long-term low-frequency, high-torque, and frequent start-stop frequency converter operation, a custom-designed independent frequency converter motor can be provided. This motor features frequency converter insulation technology and high-frequency vibration resistance design, effectively preventing rapid temperature rise and winding aging issues under frequency converter conditions, making it suitable for automated speed control production lines.
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