Bonfiglioli T56BN/4 Three-Phase Asynchronous Motor

The Bonfiglioli T56BN/4 three phase asynchronous motor is a compact electric motor built on the frame 56 design with a four pole configuration. It is intended for low power industrial applications where reliable rotation and simple integration are required. The four pole design provides a practical speed for small machines, fans, pumps, and auxiliary equipment. The T56BN/4 designation identifies the frame and configuration within the Bonfiglioli motor range. The exact electrical ratings are determined by the nameplate and the specific build.

Product Overview

The T56BN/4 motor belongs to the family of Bonfiglioli asynchronous motors used in industrial drive systems. Asynchronous motors are robust and widely applied because they are simple, reliable, and easy to maintain. The frame 56 size is compact and suits small machines where space is limited. The four pole configuration produces a nominal speed that is lower than a two pole motor and higher than a six pole motor, offering a balanced choice for general low power duties.

The motor can be used as a standalone drive or combined with a gearbox to achieve a lower output speed and higher torque. When combined with a reducer, the motor flange and shaft must match the gearbox input interface. The T56BN/4 is designed for standard industrial mounting and electrical connection. Proper selection requires matching the motor to the load, supply, environment, and control method.

Construction and Design

The motor housing supports the stator, rotor, bearings, and shaft. The stator windings are insulated for industrial operation. The rotor is mounted on a shaft that is supported by bearings selected for the expected loads. The shaft extension is machined to accept pulleys, couplings, or other driven components. 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. Connections should be made according to the connection diagram and local regulations. The mounting arrangement allows the motor to be secured to a machine frame or base. Proper mounting ensures alignment with the driven equipment and helps control vibration. Seals and bearing covers protect internal components from dust and moisture in normal industrial environments.

Performance Characteristics

The performance of the T56BN/4 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 small machines. 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 T56BN/4 motor is suitable for small machinery, fans, pumps, conveyors, packaging equipment, and auxiliary drives. Its compact frame 56 design makes it useful in equipment where space is limited. The four pole configuration provides a practical speed for many low power applications. 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. When the motor is part of a geared drive, the gearbox maintenance schedule should also be followed.

Selection Considerations

When selecting the T56BN/4 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 T56BN/4 three phase asynchronous motor offers a compact frame 56 design with a four pole configuration for low power industrial drives. Its construction supports reliable operation in small machinery, fans, pumps, and auxiliary equipment. With proper installation and maintenance, the motor provides stable performance and long service life.