Vídeo Aulas WEG: Cuidados Mecânicos com Motores

Summary

This video lesson focuses on essential mechanical care for motors, covering key topics like motor fixation, foundation, and alignment. It explains how to securely fix motors using screws or flanges, ensuring proper dimensional fit and concentricity. The video emphasizes the importance of avoiding excessive vibration, proper foundation construction, and minimizing energy loss through correct alignment. Additionally, it highlights maintenance best practices such as avoiding improper tension on belts and ensuring alignment to prevent premature wear on components. Key tools like tension meters and alignment devices are recommended to maintain motor efficiency and longevity.

Takeaways

• 😀 Motors should be securely fixed by their feet or flanges, with the dimensional specifications available in the product's technical catalog.
• 😀 The fixation screws should have a thread length 1.5 times the diameter of the screw for optimal performance.
• 😀 For large motors or harsh environments, it is recommended to support the motor in addition to flange fixation, ensuring proper support.
• 😀 The motor should never be supported on its fins; if necessary, purchase a motor with a flange designed for this purpose.
• 😀 Base thickness and flange depth must be considered when determining the screw length for fixation between the motor and the base.
• 😀 The foundation for motors should minimize vibrations and be made of concrete or metal, with at least 75% of the motor's feet in contact with the base.
• 😀 Avoid using roller bearings for direct coupling as they can create noise and cause premature damage due to insufficient preload.
• 😀 Always use the correct tools to prevent damage to the motor, and follow the manufacturer’s specifications for maximum load and speed.
• 😀 When using pulleys and belts, ensure proper tension: too tight causes bearing damage, while too loose can lead to slippage and excessive heat.
• 😀 Misalignment of pulleys can cause additional stress on bearings and shafts, so proper alignment is crucial for extending motor life and reducing energy consumption.

Q & A

What are the main mechanical care considerations for motors?

The main considerations include proper fixation, foundation, and alignment. These factors ensure the motor operates efficiently and avoids premature wear or damage.

How should a motor be fixed?

A motor can be fixed by its feet or flange. The dimensions for fixing are specified in the product's technical catalog. For feet fixation, the screw length should be at least one and a half times the screw diameter.

What is recommended for fixing larger motors or in severe applications?

For larger motors or severe applications, it's recommended to use additional support along with flange fixation to ensure stability and prevent damage.

Can a motor be supported by its cooling fins?

No, the motor should never be supported by its cooling fins. If necessary, an alternative construction with a different flange design should be used.

What is important when determining the screw length for motor fixation?

The screw length must take into account the thickness of the user's base and the depth of the motor's flange thread. For large flanges, the screw should not exceed the thread length to avoid contact with the motor's coil.

How should motors be mounted to minimize vibration?

Motors should be mounted on a concrete or metal base, with at least 75% of the motor feet in contact with the surface. The base should be free from vibrations caused by nearby machinery, and the structure should maintain rigidity to avoid resonance.

What is the impact of using roller bearings in direct coupling?

Using roller bearings for direct coupling can cause excessive noise and premature damage due to insufficient preload, which can lead to bearing failure.

What are some key precautions when using motor couplings with pulleys and belts?

The belt tension should be carefully managed to avoid it being too tight, which can damage bearings, or too loose, which can cause slippage and excessive heat. A tension meter should be used according to the belt manufacturer's specifications.

What are the different types of misalignment in motor installations?

Misalignment can occur in three forms: parallel, radial angular, or axial. Proper alignment tools like dial indicators or laser alignment instruments should be used to ensure accuracy.

How does misalignment affect motor performance?

Misalignment increases energy consumption, accelerates wear on components like seals and bearings, and can lead to issues like shaft wear, leakage, contamination, overheating, and vibration.