Purchase now: Bonfiglioli BN 112M 4 AC Electric Motor
Purchase now: Atlantechdrives provides you the BN 112M 4 230/400-50 IP55, an exceptionally rugged, industrial-grade 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 and reliability across all heavy industrial sectors. This specific model is built on an IEC 112M aluminum frame. The «M» designation is critical: it signifies a Medium stator core length, which provides a massive jump in horsepower and continuous torque capability compared to smaller 90 and 100 frame motors. Engineered with a highly balanced 4-pole stator winding and operating at 50Hz, it delivers a synchronous speed of 1500 RPM (typically running around 1440-1460 RPM under nominal full load). This 4-pole configuration provides the absolute ideal balance of operational speed and high starting torque, making it the premier prime mover for driving large heavy-duty worm gearboxes, massive inline helical reducers, high-volume centrifugal fluid pumps, and severe-duty industrial ventilation blowers. Protected by a highly durable IP55 rating, it effortlessly repels factory dust and direct water jets.
Technical Specifications of the BN 112M 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 brutal duty cycles. The dynamically balanced rotor guarantees whisper-quiet, vibration-free operation even under maximum load.
- Part Number: BN 112M 4 230/400-50 IP55
- Motor Type: 3-Phase AC Induction Motor
- Frame Size: IEC 112M (Medium 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: The Star-Delta Starting Protocol
The 112M frame size typically produces around 4.0 kW (5.5 HP) of mechanical power. At this size, correct wiring at the terminal box becomes absolutely critical for plant safety. Expert Tip: The nameplate of the BN 112M 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. Because of its large size, starting this motor Direct-On-Line (DOL) can cause a massive inrush current spike that might trip your factory’s main breakers. It is highly recommended to use a VFD, a Soft Starter, or an automated Star-Delta contactor system to bring this motor up to speed smoothly.
Maintenance and VFD Compatibility (Inverter Duty)
The BN 112M 4 features premium Class F insulation, making it highly robust and fully suitable for use with Variable Frequency Drives (VFDs) to precisely control process speeds and conserve energy. However, you must be acutely aware of its thermal limitations at low RPMs. Because it is a TEFC motor (Totally Enclosed Fan Cooled), the rear plastic cooling fan is mechanically driven directly by the rotor shaft. At extremely low speeds (below 20-25 Hz), the fan simply does not spin fast enough to push adequate air over the aluminum cooling fins. If your machine design requires running this heavy motor at continuously low speeds under high torque load, the internal copper losses will cause severe overheating. In such cases, you must add an external forced-ventilation (servo-fan) unit to the rear of the motor cowl to prevent insulation failure.
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 and verify that the pump or fan load does not exceed the motor’s horsepower limits at that higher speed.
Q: What does the IP55 protection rating actually mean?
A: IP55 signifies that the motor housing is highly protected against dust ingress (dust will not accumulate in sufficient quantities to interfere with operation) and is protected against low-pressure water jets from any direction, making it highly suitable for harsh factory washdown environments.
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