Rossi gearmotor composed of MR 21 81 UP2A gearbox and three-phase asynchronous motor

1. General Description

The Rossi gearmotor, consisting of the MR 21 81 UP2A gearbox and a three-phase asynchronous motor, is a powerful and versatile combination of motor and gearbox for industrial applications. This used gearmotor offers an excellent opportunity to purchase a high-quality device at a lower cost than a new one. Robustness and reliability are the main strengths of this machine.

2. Visual Appearance and Construction

Visually, the Rossi gearmotor with the MR 21 81 UP2A gearbox appears to be a solid and well-assembled unit. The MR 21 81 UP2A gearbox has a compact structure, typically made of aluminum alloy or steel, with a robust, industrial look. The three-phase asynchronous motor mounts directly to the rear of the gearbox, creating an integrated unit. The machine is available in gray or blue, with a corrosion-resistant painted finish.

Components:

• MR 21 81 UP2A reducer: Metal body, epicyclic or worm gears.
• Three-phase asynchronous motor: Cylindrical body with external cooling fans and electrical connection terminals.

3. Measurements and Technical Data

• Rossi MR 21 81 UP2A reducer:

  • Type: Planetary or worm gear reducer.
  • Dimensions: Detailed specifications not always available online, but generally compact to fit in tight spaces.
  • Transmission Ratio: Variable depending on the model and application needs.

• Three-phase asynchronous motor:

  • Power: 3 kW or 3.6 kW, depending on the specific version.
  • Revolutions per minute: 1450 rpm.
  • Operating Frequency: 50 Hz and 60 Hz.
  • Motor Type: Three-phase asynchronous motor, designed to operate on three-phase alternating current.

4. Mechanical Characteristics

• Transmission Efficiency: The MR 21 81 UP2A reducer is designed to offer high efficiency with reduced noise and vibration.
• Maximum Torque: Torque varies depending on the gear ratio and engine power. Typically high for industrial applications.
• Input and Output Speed: The output shaft speed is adjustable according to the gear ratio and engine speed.

5. Procedure for Use

To use the Rossi gearmotor with MR 21 81 UP2A reducer, follow these steps:

1. Installation: Mount the gearmotor on a stable base using the mounting flanges. Make sure the motor and gearmotor are aligned correctly.
2. Electrical Connection: Connect the motor to the three-phase electrical network, making sure that the voltage and frequency match the specifications (50 Hz or 60 Hz).
3. Gearbox Setup: Set the desired gear ratio through the gearbox. This may require adjusting the gears or other internal components.
4. Startup and Test: Turn on the engine and test the gearmotor. Check for vibrations and strange noises and make sure everything is working properly.

6. Matching Accessories

• Replacement Gears: To adapt the gearbox to different transmission needs.
• Cooling Devices: If the gearmotor operates in hot or high intensity environments.
• Speed ​​and Torque Sensors: To monitor and adjust the performance of the gearmotor.
• Brackets and Mounts: To ensure proper installation and alignment.

7. Mathematical Formulas for Optimal Operation

• Couple (T):

  $$T$$

  Where:

  • TT $T$ = Torque (Nm)
  • PP $P$ = Motor power (W)
  • ω\omega $\omega$ = Angular velocity (rad/s)

• Angular Velocity (ω):

  $$\omega$$

  Where:

  • ω\omega $\omega$ = Angular velocity (rad/s)
  • nn $n$ = Engine speed (rpm)

• Transmission Ratio(s):

  $$i$$

  Where:

  • ii $i$ = Transmission ratio
  • NingressoN_{\text{ingresso}} $N$ ingresso ​=
  • NuscitaN_{\text{uscita}} $N$ uscita ​=

8. Workable Materials

The Rossi gearmotor with MR 21 81 UP2A gearbox and asynchronous three-phase motor is suitable for a wide range of industrial applications, including the processing of materials such as:

• Metals: For machining and assembly processes.
• Plastics: In manufacturing and handling applications.
• Wood: For the processing and production of wooden components.
• Composite Materials: In sectors requiring high precision.

9. Maintenance and Control of Used Goods

• Visual Inspection: Check for signs of wear, external damage, and lubricant leaks. Verify that all components are in good condition.
• Lubrication Check: Make sure the gearbox and motor are well lubricated according to the manufacturer's specifications.
• Operation Test: Perform load tests to ensure that the gear motor operates without abnormal vibration and noise.
• Maintenance Documentation: Check the service and maintenance documentation to ensure that the gearmotor has been properly maintained.

10. Areas of Use

The Rossi gearmotor consisting of the MR 21 81 UP2A reducer and the asynchronous three-phase motor is used in various sectors, including:

• Industrial Automation: To operate machines and production lines.
• Transmission Systems: In mechanical transmission and speed reduction applications.
• Textile Sector: For the handling and control of textile processes.
• Food Industry: For the handling and processing of materials and production equipment.

11. Advantages of Buying Used

• Lower Cost: The used gearmotor offers excellent value for money, reducing the cost compared to the new one.
• Reliability: If well maintained, a used gearmotor can guarantee performance comparable to that of a new one.
• Immediate Availability: Buying used reduces delivery wait times, allowing for quick replacement or start-up of operations.

Conclusion

The Rossi gearmotor, consisting of the MR 21 81 UP2A gearbox and a three-phase asynchronous motor, is a versatile and powerful solution for industrial applications requiring high reliability and robustness. Thanks to its solid construction and excellent performance, this gearmotor is an advantageous choice, especially if purchased used, allowing you to obtain a high-quality product at a lower price and with immediate availability.