Purchase now: Bonfiglioli BN 90S 2 AC Electric Motor
Purchase now: Atlantechdrives provides you the BN 90S 2 230/400-50 IP55, an exceptionally reliable and rugged high-speed three-phase asynchronous AC induction motor manufactured by the global power transmission experts at Bonfiglioli. Designed to comply strictly with standard IEC international dimensions, the BN series is universally recognized for its unparalleled durability in severe industrial applications. This specific model is built on an IEC 90S aluminum frame. The «S» designation stands for a Short stator core, providing a highly compact footprint for its power class. Most importantly, it features a highly specialized 2-pole stator winding. Operating at a standard 50Hz frequency, it delivers a blistering synchronous speed of 3000 RPM (typically running around 2820-2880 RPM under nominal full load). This extremely high base speed makes it the absolute ideal prime mover for applications requiring rapid rotational velocity rather than massive starting torque, such as heavy-duty centrifugal water pumps, high-volume industrial ventilation fans, high-speed rotary compressors, and precision machine tool spindles. Enclosed in a thermally optimized aluminum housing with an IP55 protection rating, it effectively repels abrasive factory dust and low-pressure water jets.
Technical Specifications of the BN 90S 2 Motor
This motor utilizes premium-grade copper windings and high-quality Class F electrical insulation, ensuring it can withstand significant internal heat generation without electrical breakdown. The dynamically balanced rotor guarantees whisper-silent, vibration-free 24/7 operation even at its maximum rated velocities.
- Part Number: BN 90S 2 230/400-50 IP55
- Motor Type: 3-Phase AC Induction Motor
- Frame Size: IEC 90S (Lightweight aluminum construction, short core)
- 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 Terminal Wiring
Understanding the mechanical output of your motor is critical for preventing catastrophic 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 rotational torque for the same horsepower rating. You must never blindly replace a broken 4-pole motor with a 2-pole motor without verifying your gearbox ratios or pump impeller capacities, as the suddenly increased speed will violently overload the driven system. Furthermore, the motor’s 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. Incorrectly wiring this motor in Delta (Δ) at 400V will melt the copper insulation within seconds, causing a severe short circuit and a potential fire.
Maintenance and Bearing Lifespan at 3000 RPM
The BN 90S 2 is a high-speed machine. Operating continuously near 3000 RPM places significantly more friction and mechanical stress on the internal ball bearings than standard 1500 RPM motors. Routine vibration analysis and auditory checks are highly recommended to prevent unexpected downtime. Because it is a TEFC (Totally Enclosed Fan Cooled) motor, the rear plastic cooling 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.
Frequently Asked Questions (FAQs)
Q: Can I safely 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 a massive 20% to an incredible 3600 RPM. You must ensure your driven machinery can safely handle this increased rotational velocity without vibrating apart.
Q: What does the «S» mean in the 90S frame size?
A: The IEC 90 frame size dictates the physical external dimensions (shaft height). The «S» designates a Short internal core length within that 90 frame geometry, providing a specific power output that is less than the longer 90L variant but in a more compact casing.
Do you need more references from this brand? Explore our full catalog of Bonfiglioli here.
For high-speed industrial applications, this 2-pole asynchronous motor delivers the perfect input power to efficiently drive right-angle units like the VF 44 P1 70 P63 B5 B3 worm gearbox.
