Bonfiglioli BN71C4 8D1702022F AC Motor 0.75 kW 1670 rpm 265/460V 3PH

The Bonfiglioli BN71C4 8D1702022F AC motor is a three phase asynchronous motor built on the IEC 71 frame with a four pole configuration. It is rated at 0.75 kW and operates at approximately 1670 rpm, with a voltage rating of 265/460V AC for three phase supply. The part number 8D1702022F identifies the specific build. This motor is designed for dependable continuous duty in pumps, fans, conveyors, and general industrial machinery where a compact frame and stable torque delivery are required.

Product Overview

The BN series is a well established range of Bonfiglioli three phase motors used in industrial drive systems. The frame 71 size is compact and fits many standard mounting arrangements. The four pole configuration produces a moderate speed suitable for general applications. The 0.75 kW rating places the motor in the low to medium power range, which is common for auxiliary drives and small machines. The dual voltage rating of 265/460V allows connection to different supply configurations according to the terminal arrangement.

The motor includes a stator, rotor, shaft, bearings, terminal box, and cooling fan. The housing supports the internal components and provides mounting points. The fan and fan cover provide cooling airflow over the housing during operation. The terminal box provides a safe connection point for the electrical supply. The motor can be used as a standalone drive or paired with a gearbox to achieve lower output speed and higher torque.

Construction and Design

The motor housing is designed to protect internal components and support the bearing assemblies. The stator windings are insulated to withstand the electrical stresses of industrial operation. The rotor is mounted on a shaft supported by bearings selected for the expected radial and axial loads. The shaft extension is machined to accept couplings, pulleys, or other driven components. The fan and fan cover provide cooling airflow over the housing during operation.

The terminal box allows the motor to be connected to the supply and control circuit. Electrical connections should be made according to the connection diagram and local regulations. The mounting arrangement may include feet, flanges, or other interfaces depending on the build. Proper mounting ensures that the motor remains aligned with the driven equipment and that vibration is controlled. Seals and bearing covers help protect the internal components from dust and moisture in normal industrial environments.

Performance Characteristics

The performance of the BN71C4 motor depends on its electrical design and the connected load. Motor speed is primarily determined by the supply frequency and the number of poles. The four pole design provides a moderate speed suitable for many general applications. Torque is produced by the interaction between the stator field and the rotor current. The motor should be operated within its rated voltage, frequency, and duty cycle to maintain stable thermal performance.

Starting current and starting torque should be considered when selecting protective devices and control equipment. The motor should be protected against overload, phase loss, and abnormal supply conditions. Efficiency and thermal behavior are important in continuous operation. Adequate ventilation around the motor helps maintain stable temperatures. When variable speed operation is required, the motor and drive should be selected together to ensure compatibility.

Applications

The Bonfiglioli BN71C4 motor is suitable for pumps, fans, conveyors, mixers, packaging equipment, and general machine drives. The frame 71 size makes it useful in equipment where space is limited. The 0.75 kW rating provides enough power for many small and medium duties. The motor can be paired with a gearbox when lower output speed or higher torque is needed.

The operating environment should be considered when applying the motor. Dust, moisture, chemicals, and high ambient temperatures can affect insulation, bearings, and cooling. In such conditions, additional protection or a different motor configuration may be required. The motor should be installed where it can be inspected and maintained. Correct alignment with the driven equipment helps reduce vibration and bearing load.

Installation Guidelines

Installation should begin with a check of the nameplate data and a visual inspection of the motor. The motor should be mounted on a rigid base that can withstand the torque reaction. The shaft should be aligned with the driven equipment to avoid excessive radial and axial loads. Couplings should be fitted according to the manufacturer recommendations and checked for alignment. Mounting bolts should be tightened to the recommended torque.

Electrical connections should be made by qualified personnel following local regulations. The supply voltage and frequency must match the motor rating. The direction of rotation should be verified before connecting the load. Proper grounding is essential for safe operation. After installation, a short run without load helps confirm that the motor operates smoothly and without abnormal noise or vibration.

Maintenance Recommendations

Regular maintenance helps ensure reliable motor operation. The cooling fan and fan cover should be kept clean to maintain airflow. Bearing noise and vibration should be monitored. The motor insulation resistance can be measured periodically to detect deterioration. Electrical connections should be checked for tightness and signs of overheating. Any abnormal noise, smell, or temperature rise should be investigated promptly.

In environments with dust or moisture, additional protection measures may be needed. The motor should be kept clean and dry. Maintenance records help identify trends and support planned servicing. Following a consistent maintenance schedule reduces the risk of unexpected downtime and extends the operating life of the motor.

Selection Considerations

When selecting the BN71C4 motor, engineers should confirm the supply voltage, frequency, phase, rated power, speed, frame size, mounting, and enclosure requirements. The motor must provide enough torque for the load under starting and running conditions. The duty cycle and ambient temperature affect thermal capacity. Protective devices should be selected to match the motor and load characteristics.

The motor interface must match the driven equipment or gearbox. Shaft dimensions, flange dimensions, and mounting holes should be checked. For variable speed applications, the motor should be compatible with the selected drive. Correct selection and installation help ensure dependable performance, stable thermal behavior, and long service life.

Conclusion

The Bonfiglioli BN71C4 8D1702022F AC motor offers a compact frame 71 solution with 0.75 kW of power, approximately 1670 rpm, and 265/460V three phase compatibility. Its construction supports reliable operation in pumps, fans, conveyors, and general industrial machinery. With proper installation and maintenance, the motor provides stable performance and long service life.