VEM Thurm K21R 71 G 4 Three-Phase Motor with Bonfiglioli VF44 F1 10
The VEM Thurm K21R 71 G 4 three phase motor with Bonfiglioli VF44 F1 10 gearbox is an integrated drive assembly that combines a VEM electric motor with a Bonfiglioli worm gear reducer. The VEM K21R 71 G 4 motor uses a frame 71 design and a four pole configuration. The Bonfiglioli VF44 F1 10 gearbox provides right angle speed reduction with a compact worm gear design. Together, these components form a drive package suitable for industrial machinery that requires reliable torque transmission and controlled output speed.
Product Overview
The VEM Thurm K21R 71 G 4 motor is a three phase asynchronous motor designed for industrial drive duties. The frame 71 size is compact and suits machines with limited mounting space. The four pole configuration provides a moderate speed suitable for many general applications. The motor includes a stator, rotor, shaft, bearings, terminal box, and cooling provisions. The Bonfiglioli VF44 F1 10 gearbox uses a worm and wheel design to reduce the motor speed and increase output torque.
The VF44 F1 10 configuration defines the gearbox size, shaft arrangement, and ratio code. The gearbox housing supports the worm shaft and wheel with sufficient rigidity for stable gear mesh. The motor and gearbox are matched to form a compact assembly. The combined unit can be used in conveyors, packaging machinery, and general industrial equipment where a right angle drive is preferred.
Construction and Design
The VEM motor housing supports the stator, rotor, bearings, and shaft. 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 terminal box provides a safe connection point for the electrical supply. The motor shaft connects to the gearbox input through the matching interface.
The Bonfiglioli VF44 gearbox uses a hardened worm shaft and a bronze worm wheel. The housing maintains correct alignment between the worm and wheel under load. Bearings support the radial and axial forces generated by the gear mesh. Seals protect the lubricant and bearings from dust and moisture. Lubrication is contained within the housing and distributed to the gear mesh and bearings during operation. The compact assembly reduces the number of separate transmission components.
Performance Characteristics
The VEM K21R 71 G 4 motor provides the input power and speed for the assembly. The four pole configuration produces a moderate speed, and the VF44 gearbox reduces this speed according to the F1 10 ratio code. The output torque is increased in proportion to the reduction ratio, subject to gearbox efficiency and torque limits. The worm gear design provides smooth torque transfer and quiet operation.
The integrated drive should be selected with an appropriate service factor for the duty cycle. Starting loads, shock loads, and continuous operation affect the thermal and mechanical capacity of the assembly. The motor should be protected against overload and abnormal supply conditions. The gearbox should be checked for thermal capacity when operating at high duty cycles or high ambient temperatures. Correct lubrication and installation help maintain stable performance.
Applications
The VEM K21R 71 G 4 with Bonfiglioli VF44 F1 10 is suitable for small conveyors, packaging machines, labeling equipment, rotary feeders, and general industrial machinery. The compact assembly is useful in machines where space is limited and a direct motor and gearbox package is preferred. The worm gear reducer provides smooth operation and a right angle layout that can simplify machine design.
The motor can be connected to standard industrial supply arrangements according to the nameplate rating. The geared drive can be used in applications that require frequent starting and stopping, provided that the duty cycle and thermal capacity are considered. 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 assembly. The geared motor should be mounted on a rigid base that can withstand the torque reaction. Mounting bolts should be tightened to the recommended torque. The motor should be connected according to the terminal diagram for the available supply voltage. The output shaft should be aligned with the driven equipment to avoid excessive radial and axial loads.
After installation, the assembly should be checked for smooth rotation and correct oil level in the reducer. A short run without load helps confirm that the motor and gearbox operate correctly. The direction of rotation should be verified before connecting the load. Any unusual noise, vibration, or temperature rise should be investigated before full service. Electrical connections should be made by qualified personnel following local regulations.
Maintenance Recommendations
Regular maintenance supports reliable performance and long service life. The motor cooling fan and fan cover should be kept clean. The reducer oil level and oil condition should be checked at recommended intervals. Seals and bearings should be inspected periodically. Leakage, abnormal noise, or vibration should be addressed promptly. Electrical connections should be checked for tightness and signs of overheating.
The exterior of the motor and gearbox should be kept clean to support heat dissipation. Adequate airflow around the assembly helps maintain stable temperatures. In dusty or humid environments, additional protection may be needed. Maintenance records help identify trends and support planned servicing. Following a consistent maintenance schedule reduces the risk of unexpected downtime.
Selection Considerations
When selecting the VEM K21R 71 G 4 with VF44 F1 10 gearbox, engineers should confirm the supply voltage, frequency, motor power, output speed, output torque, duty cycle, and environmental conditions. The ratio code and motor speed determine the output speed. The available torque depends on motor power and gearbox efficiency. A service factor should be applied for starting loads, shock loads, and continuous operation.
The motor and gearbox interfaces must match. The mounting arrangement should suit the machine layout and provide adequate support. The output shaft and mounting features should match the driven equipment. Correct selection and installation help ensure smooth operation, stable thermal behavior, and long service life.
Conclusion
The VEM Thurm K21R 71 G 4 three phase motor with Bonfiglioli VF44 F1 10 gearbox offers a compact integrated drive solution with reliable motor performance and smooth worm gear reduction. Its construction supports dependable torque transmission in conveyors, packaging machinery, and industrial equipment. With correct installation and maintenance, the assembly provides stable performance and long service life.
