Troubleshooting Motor Vibration Issues in Overhung Fan Setup

Question:

I am facing challenges in identifying the source of the vibration experienced in the motor's vertical and horizontal positions, both on the non-drive and drive ends, measured in mm/s. Despite inspecting the alignment, checking for looseness, and examining its mounting, the issue persists. The fan is mounted in an overhung position, connected to two plumber block housings via a shaft, and driven by belts connected to the motor. Any assistance in resolving this issue would be greatly appreciated.

Top Replies

When experiencing vibration problems, it is recommended to seek advice in the vibration forum where there is more activity. Providing specifics such as vibration levels and prominent frequencies can aid in identifying the root cause, whether it be a balance, belt, or electrical issue. To facilitate discussion, consider attaching plots like spectrums, TWF, or trends for further analysis and troubleshooting.

Thank you for the prompt response. I will investigate further. The vibration levels are significantly higher in the Horizontal position Drive and non-drive, reaching 90mm/s. The motor is audibly buzzing with vibration. The spectral analysis indicates an immediate spike, likely representing the RPM, with little else noticeable. The irregular spacing suggests that the issue is not electrical. I suspect misalignment, as upon inspection, the belts are vibrating significantly, with the inner belt exhibiting more bounce than the outer belt.

Robertmac expressed gratitude for the prompt response and mentioned that they will investigate further. The increased vibration levels, particularly at the Horizontal position Drive and non-drive, are concerning at 90mm/s. The motor is emitting a buzzing sound due to the high vibration levels, which could indicate resonance issues with the fan, motor, or belt. It is recommended to check the natural frequency of the components and conduct a thorough inspection of the base/foundation. Kindly share the spectrum for further analysis. Regards, Irshad Akhtar.

Before balancing the impeller, it is important to thoroughly inspect it for any material buildup or erosion. Additionally, conducting dynamic balancing can help ensure optimal performance.

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Frequently Asked Questions (FAQ)

FAQ: 1. What are possible reasons for motor vibration in both vertical and horizontal positions in an overhung fan setup?

Answer: - Motor vibration in an overhung fan setup can be caused by various factors such as misalignment, imbalance, worn bearings, belt issues, or structural problems.

FAQ: 2. How can I troubleshoot motor vibration issues in an overhung fan setup?

Answer: - To troubleshoot motor vibration issues, you should inspect alignment, check for looseness in components, examine mounting conditions, evaluate belt tension, and assess bearing health.

FAQ: 3. What specific steps can be taken to address motor vibration in an overhung fan setup connected by belts to the motor?

Answer: - Specific steps to address motor vibration include ensuring proper alignment of components, tightening all connections, checking for worn bearings, adjusting belt tension, and examining the structural integrity of the mounting.

FAQ: 4. Are there any common problems associated with motor vibration in overhung fan setups?

Answer: - Common problems associated with motor vibration in overhung fan setups include misalignment of components, imbalanced fan blades, loose connections, worn bearings, and inadequate belt tension.

FAQ: 5. How important is it to address motor vibration issues promptly in an overhung fan setup?

Answer: - Addressing motor vibration promptly is crucial in an overhung fan setup to prevent potential damage to components, reduce energy consumption, extend the lifespan of the equipment, and ensure optimal performance of the system.

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