Purchase now: Bonfiglioli BN 100LB 4 AC Electric Motor
Purchase now: Atlantechdrives provides you the BN 100LB 4 230/400-50 IP55, a rugged, exceptionally reliable 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 a universal workhorse built for extreme durability across all heavy industrial sectors. This specific model is built on an IEC 100LB aluminum frame. The «LB» designation is critical: it signifies an extended (Long) stator core, delivering significantly higher horsepower and torque output than the standard 100 frame geometry while maintaining the same physical shaft height. Engineered with a 4-pole stator winding and operating at 50Hz, it delivers a synchronous speed of 1500 RPM (typically running around 1420-1460 RPM under nominal full load). It provides the absolute ideal balance of rotational speed and high starting torque, making it the premier choice for driving large worm gearboxes, heavy inline helical reducers, massive centrifugal fluid pumps, and industrial ventilation blowers. Protected by a highly durable IP55 rating, it effectively repels factory dust and water jets.
Technical Specifications of the BN 100LB 4 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 duty cycles. The dynamically balanced rotor guarantees whisper-quiet, vibration-free operation.
- Part Number: BN 100LB 4 230/400-50 IP55
- Motor Type: 3-Phase AC Induction Motor
- Frame Size: IEC 100LB (Extended core for maximum torque)
- Number of Poles: 4-Pole (1500 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: Star-Delta Terminal Wiring
Incorrect wiring at the terminal box is the absolute leading cause of instant motor destruction during plant commissioning. Expert Tip: The nameplate of the BN 100LB 4 explicitly states «230/400V». This dictates that the individual copper coils inside the motor are engineered to handle a maximum of 230 Volts across them. If your industrial facility provides a standard 400V 3-phase power supply, you must arrange the brass bridging links inside the terminal box into the «Star» (Y) configuration. This safely distributes the 400V across two coils in series. If you mistakenly wire the terminal block in the «Delta» (Δ) configuration and apply 400V, the coils will receive nearly double their rated voltage. The insulation will melt, and the motor will short out and catch fire within seconds.
Maintenance and VFD Compatibility (Inverter Duty)
The BN 100LB 4 features Class F insulation, making it highly robust and fully suitable for use with Variable Frequency Drives (VFDs) or inverters to control process speeds. However, you must be aware of its thermal limitations at low RPMs. Because it is a TEFC motor (Totally Enclosed Fan Cooled), the rear plastic cooling fan is directly attached to the rotor shaft. At extremely low speeds (below 25 Hz), the fan does not spin fast enough to push adequate air over the cooling fins to dissipate the heat generated by the copper losses. If your machine design requires running the motor at continuously low speeds under heavy load, consider adding an external forced-ventilation (servo-fan) unit to the rear of the motor cowl.
Frequently Asked Questions (FAQs)
Q: Can I run this 50Hz motor in a country with a 60Hz power grid?
A: Yes. Most Bonfiglioli 50Hz induction motors can be safely operated on a 60Hz grid. However, the synchronous speed will increase by 20% (from 1500 RPM to 1800 RPM), and you must adjust your driven machine’s gearing to compensate for the higher output speed.
Q: What does the IP55 protection rating actually mean?
A: IP55 signifies that the motor housing is highly protected against dust ingress (it will not interfere with operation) and is protected against low-pressure water jets from any direction, making it suitable for factory washdown environments.
Do you need more references from this brand? Explore our full catalog of Bonfiglioli here.
This 4-pole asynchronous motor provides the ideal power output to drive high-torque gear units such as the universal W 75 U 25 P90 B14 B3 for continuous industrial duty.
