7.5HP Three Phase Motor
What is a 7.5HP Three Phase Motor?
The 7.5HP three-phase motor features a reinforced 132S frame, a thickened cast iron housing, and thickened high-purity copper windings. It boasts an insulation class of F and a protection class of IP55, supporting 50Hz/60Hz global dual-frequency switching and adapting to the full range of international industrial voltages from 380V to 690V. It can withstand 24-hour uninterrupted production, frequent heavy-load starts and stops, and harsh working conditions involving dust and humidity, making it widely applicable in chemical, water treatment, mining, building materials, large fans and pumps, and heavy-duty conveying equipment. The 5.5KW motor offers ample power reserve, stronger resistance to load impacts, and superior stability during continuous operation, making it a core motor for upgrading standardized factory equipment, supporting heavy-duty production lines, and driving high-load fluid equipment.
- 1.15 High Service Factor, Enhanced Heavy-Duty Fault Tolerance. Unlike ordinary small and medium-power motors with a standard service factor of 1.0, this model boasts an ultra-high service factor of 1.15, capable of withstanding 115% overload for extended periods. It perfectly handles sudden load shocks, uneven material distribution, and heavy-load start-up delays. In scenarios involving heavy-duty intermittent overloads and large load fluctuations, it avoids frequent tripping, overheating shutdowns, and winding burnout. Its fault tolerance far exceeds that of conventional small-power motors, making it suitable for complex, variable-load industrial production environments.
- The 132S enlarged frame provides a robust and deformation-resistant structure. Utilizing a 132S enlarged and reinforced cast iron frame, it boasts a larger size and thicker housing compared to smaller motors of 5HP and below, resulting in a comprehensive upgrade in rigidity, vibration resistance, and impact resistance. Under high loads and continuous operation, there is no resonance or misalignment deformation. Equipped with double-sealed high-precision bearings, the overall machine vibration is extremely low, effectively preventing bearing wear, shaft misalignment, and abnormal noise malfunctions caused by long-term heavy-duty operation, significantly extending the overall service life of the machine.
- Comprehensive factory inspection. Every motor undergoes seven core inspections before leaving the factory: insulation withstand voltage test, three-phase current balance test, no-load temperature rise test, 115% overload durability test, torque accuracy test, noise and vibration test, and waterproof and dustproof sealing test. 100% inspection before leaving the factory ensures accurate parameters and meets performance standards, preventing substandard or defective products from entering the market.
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Model |
7.5HP Three phase motor |
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Frame |
132 |
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Power |
7.5 Horse power 5KW |
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Speed |
3000rpm, 1500rpm, 1000rpm |
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Voltage |
380/400V, 400/690V 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 |
Φ38 |
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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 |
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Duty |
S1 |
Installation position
Q: What is the practical industrial significance of a service factor of 1.15 for a 7.5HP 5.5KW motor?
A: A service factor of 1.15 indicates that the motor can stably withstand 115% of its rated power load for extended periods, a core characteristic of mainstream industrial motors. Ordinary low-power motors only support a standard 1.0 load, and are prone to tripping and overheating due to slight load fluctuations. In contrast, the 7.5HP motor, with its ultra-high service factor, perfectly adapts to complex operating conditions such as uneven material distribution, heavy start-stop cycles, and sudden load shocks. It offers higher fault tolerance, more stable operation, and is more suitable for long-term use in mass-production industrial equipment.
Q: What causes excessive vibration in a 5.5kW three-phase motor, and how can it be resolved?
A: Abnormal vibration in this power motor is often caused by uneven equipment installation, misalignment of the coupling, load eccentricity, loose mounting feet, or worn bearings. This 7.5HP motor undergoes high-precision dynamic balancing at the factory, ensuring that the overall static vibration value strictly meets standards. In daily use, simply ensure the mounting surface is level, properly aligned, and the mounting bolts are tightened. Regularly checking the bearing condition will maintain low-vibration, stable operation and effectively prevent equipment resonance and component wear.
Q: What are the differences in operating conditions between vertical and horizontal installations of a 7.5HP three-phase motor?
A: The horizontal B3 installation of the 7.5HP 5.5KW motor is a general-purpose industrial model, offering even stress distribution and good vibration damping. It is suitable for most horizontally placed equipment such as fans, pumps, and conveyors, and features convenient maintenance and an extremely low failure rate. The vertical V1/B5 flange installation concentrates stress on the shaft end and is specifically designed for vertical equipment, mixing equipment, and vertical pump bodies, offering higher installation precision. The core selection should be based on the equipment structure. For heavy-duty, long-term operation, the horizontal model is preferred; for precision vertical equipment, the vertical model is sufficient.
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