Purchase now: Bonfiglioli BN 71A 2 AC Electric Motor
Purchase now: Atlantechdrives provides you the BN 71A 2 230/400-50 IP55, a premium high-speed three-phase asynchronous AC induction motor engineered by the global power transmission experts at Bonfiglioli. Designed to comply strictly with IEC international standards, the BN series is universally recognized for its unparalleled durability in severe industrial applications. This specific model is built on an IEC 71A aluminum frame and features a specialized 2-pole stator winding. Operating at a standard 50Hz frequency, it delivers a blistering synchronous speed of 3000 RPM (typically running around 2780-2850 RPM under nominal full load). This high base speed makes it the absolute ideal prime mover for applications requiring high-velocity rotation rather than high starting torque, such as heavy-duty centrifugal water pumps, high-volume industrial ventilation fans, high-speed compressors, and precision machine tool spindle drives. Enclosed in a highly durable, thermally optimized housing with an IP55 protection rating, it effectively repels factory dust and low-pressure water jets.
Technical Specifications of the BN 71A 2 Motor
This motor utilizes premium-grade copper windings and high-quality Class F insulation, ensuring it can withstand significant internal heat generation without electrical breakdown. The dynamically balanced rotor guarantees silent, vibration-free 24/7 operation even at maximum rotational velocity.
- Part Number: BN 71A 2 230/400-50 IP55
- Motor Type: 3-Phase AC Induction Motor
- Frame Size: IEC 71A (Lightweight aluminum construction)
- Number of Poles: 2-Pole (3000 RPM synchronous speed at 50Hz)
- Voltage Requirement: 230V Delta (Δ) / 400V Star (Y)
- Frequency: 50 Hz
- Protection Rating: IP55 (Dust-tight and water jet protected)
- Cooling Method: IC411 (Totally Enclosed Fan Cooled – TEFC)
Expert Installation Advice: 2-Pole Dynamics and High-Speed Applications
Understanding the mechanical output of your motor is critical for preventing machine failure. Expert Tip: Standard industrial motors are typically 4-pole (1500 RPM). Because this is a 2-pole motor (3000 RPM), it runs exactly twice as fast but provides half the torque for the same horsepower rating. You must never replace a 4-pole motor with a 2-pole motor without verifying your gearbox ratios or pump impeller capacities, as the increased speed will catastrophically overload the driven system. Furthermore, the nameplate explicitly states «230/400V». If your factory provides a standard 400V 3-phase power supply, you must arrange the brass terminal links inside the junction box into the «Star» (Y) configuration to safely distribute the voltage. Incorrectly wiring this motor in Delta (Δ) at 400V will melt the copper insulation within seconds.
Maintenance and Bearing Lifespan at 3000 RPM
The BN 71A 2 is a high-speed machine. Operating continuously near 3000 RPM places significantly more stress on the internal ball bearings than standard 1500 RPM motors. Routine vibration analysis and auditory checks are highly recommended. Because it is a TEFC (Totally Enclosed Fan Cooled) motor, the rear plastic fan is directly attached to the rotor shaft and spins incredibly fast. You must ensure the fan cowl remains completely free of dust, lint, or debris blockages. Any airflow restriction will cause the motor to rapidly overheat, destroying the factory-sealed bearing grease and leading to premature mechanical failure.
Frequently Asked Questions (FAQs)
Q: Can I run this 50Hz motor on a 60Hz power grid?
A: Yes. Most Bonfiglioli 50Hz motors can safely operate on a 60Hz grid. However, because it is a 2-pole motor, the synchronous speed will increase by 20% to an incredible 3600 RPM. You must ensure your driven machinery can safely handle this increased rotational velocity.
Q: What does the «A» mean in the 71A frame size?
A: The IEC 71 frame size dictates the physical dimensions (shaft height, bolt hole spacing). The «A» designates the specific power rating (core length) within that 71 frame geometry, typically indicating the standard or shorter core length compared to a «B» variant.
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