Purchase now: Bonfiglioli BN 90LA 6 AC Electric Motor
Purchase now: Atlantechdrives provides you the BN 90LA 6 230/400-50 IP55, an exceptionally rugged and high-torque three-phase asynchronous AC induction motor manufactured 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 90LA aluminum frame. The «LA» designation indicates an extended (Long) stator core, which delivers a significantly higher power output within the standard 90 frame footprint. More importantly, it features a specialized 6-pole stator winding. Operating at a standard 50Hz frequency, it delivers a synchronous speed of 1000 RPM (typically running around 920-960 RPM under nominal full load). This lower base speed generates vastly superior starting and running torque compared to standard 1500 RPM motors, making it the absolute ideal prime mover for heavy-duty agitators, massive industrial mixers, slow-moving crushers, and high-torque conveyor drives. Encased 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 90LA 6 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 during heavy starting loads. The dynamically balanced rotor guarantees silent, vibration-free 24/7 operation.
- Part Number: BN 90LA 6 230/400-50 IP55
- Motor Type: 3-Phase AC Induction Motor
- Frame Size: IEC 90LA (Extended core for higher power)
- Number of Poles: 6-Pole (1000 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: 6-Pole Dynamics and Star-Delta Wiring
Understanding the mechanical output and electrical wiring of your motor is critical for preventing catastrophic failure. Expert Tip: Because this is a 6-pole motor (1000 RPM), it provides approximately 50% more torque for the same horsepower rating than a standard 4-pole motor. When integrating this motor with a gearbox, you must calculate your final output speed and torque based on this lower 950 RPM base speed. Furthermore, the nameplate explicitly states «230/400V». This indicates that the individual copper coils inside the stator are engineered to handle a maximum of 230 Volts. 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, causing a severe electrical short.
Maintenance and VFD Compatibility at Low Speeds
The BN 90LA 6 features robust Class F insulation, making it highly suitable for operation with Variable Frequency Drives (VFDs) or inverters. However, because it is a TEFC (Totally Enclosed Fan Cooled) motor, the rear plastic fan is directly attached to the rotor shaft. If you use a VFD to run this already slow 6-pole motor at exceptionally low frequencies (below 20 Hz) under heavy load, the fan will not push enough air over the cooling fins to dissipate the heat generated by the copper losses. For continuous, high-torque low-speed operation, you must install an external forced-ventilation unit (servo-fan) to prevent thermal tripping and bearing 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, the synchronous speed will increase by 20% (from 1000 RPM to 1200 RPM), and you must adjust your driven machine’s gearing to compensate for the higher rotational output.
Q: What does the «LA» mean in the 90LA frame size?
A: The IEC 90 frame size dictates the physical dimensions (shaft height, bolt hole spacing). The «L» stands for Long (referring to the length of the internal stator core), and the «A» designates the specific high-power rating within that extended geometry.
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