BONFIGLIOLI RIDUTTORI 8N44020231-545902 BN90LA4-BA AC Brake Motor RBD8.2

The Bonfiglioli BN90LA4-BA AC brake motor identified by code 8N44020231-545902 is a three phase asynchronous motor equipped with an RBD8.2 brake. The BN90LA4 designation identifies the frame 90 motor with a four pole configuration and a long stator design. The BA code indicates the brake configuration. This motor is designed for applications that require reliable stopping and holding torque in addition to normal driving operation. It is suitable for conveyors, hoists, packaging machinery, and industrial automation.

Product Overview

The BN series is a well established range of Bonfiglioli three phase motors used in industrial drive systems. The frame 90 size provides a balance between compact dimensions and power capacity. The four pole configuration produces a moderate speed suitable for many general applications. The RBD8.2 brake is a spring applied electromagnetic brake that engages when power is removed. This design provides holding torque when the motor is stopped and can also provide stopping torque during normal operation.

The brake motor includes a stator, rotor, shaft, bearings, terminal box, cooling fan, and brake assembly. The brake is mounted at the rear of the motor and connected to the supply through the terminal box or a separate brake circuit. 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 supports the stator, rotor, bearings, and brake assembly. The stator windings are insulated for industrial operation. The rotor is mounted on a shaft supported by bearings selected for the expected loads. The fan and fan cover provide cooling airflow over the housing. The brake assembly includes a friction disc, spring, and electromagnet. When power is applied, the electromagnet releases the brake; when power is removed, the spring applies the brake.

The terminal box provides a safe connection point for the motor and brake supply. Electrical connections should be made according to the connection diagram and local regulations. The brake air gap and friction disc should be checked periodically. The mounting arrangement allows the motor to be secured to a machine frame or gearbox. Proper mounting ensures alignment with the driven equipment.

Performance Characteristics

The BN90LA4-BA motor provides the driving torque and speed for the application, while the RBD8.2 brake provides stopping and holding torque. The brake torque should be selected to suit the load inertia and stopping requirements. The brake release and engagement times affect the stopping behavior. The motor should be operated within its rated voltage, frequency, and duty cycle to maintain stable thermal performance.

Frequent braking can generate heat in the brake and motor. The duty cycle should be considered when selecting the brake motor. The brake air gap should be maintained within the specified range for reliable operation. The motor should be protected against overload, phase loss, and abnormal supply conditions. Correct selection and installation help ensure reliable braking and long service life.

Applications

The Bonfiglioli BN90LA4-BA brake motor is suitable for conveyors, hoists, packaging machines, labeling equipment, and industrial automation systems. The brake provides holding torque when the motor is stopped, which is important in applications that require the load to remain in position. The motor can be paired with a gearbox when lower output speed or higher torque is needed.

The brake motor should be installed in a location that allows inspection and maintenance of the brake. Correct alignment with the driven equipment helps reduce vibration and bearing load. The brake supply should be connected according to the documentation. Correct selection helps ensure reliable operation and long service life.

Installation Guidelines

Installation should begin with a check of the nameplate data and a visual inspection of the motor and brake. 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 motor and brake supply must match the nameplate ratings. The brake release and engagement should be checked before connecting the load. Proper grounding is essential for safe operation. After installation, a short run without load helps confirm that the motor and brake operate correctly.

Maintenance Recommendations

Regular maintenance supports reliable performance and long service life. The brake air gap and friction disc should be checked at recommended intervals. The cooling fan and fan cover should be kept clean. Bearing noise and vibration should be monitored. 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 may be needed. The motor and brake 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 and brake.

Selection Considerations

When selecting the BN90LA4-BA brake motor, engineers should confirm the supply voltage, frequency, rated power, speed, frame size, mounting, brake torque, and duty cycle. The brake torque must be sufficient for the load and stopping requirements. The motor must provide enough torque for the load under starting and running conditions. The installation environment affects cooling and protection requirements.

The motor and brake interfaces must match the driven equipment and control system. For variable speed applications, the motor and drive should be compatible. Correct selection and installation help ensure reliable braking, stable performance, and long service life.

Conclusion

The Bonfiglioli BN90LA4-BA AC brake motor with RBD8.2 brake offers a reliable drive and braking solution for conveyors, hoists, packaging machinery, and industrial automation. Its construction supports stable motor performance and dependable holding torque. With correct installation and maintenance, the motor and brake provide reliable operation and long service life.