Working on a blower which is directly coupled with motor

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    Coupled Motor
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Discussion Overview

The discussion revolves around the design considerations and power savings associated with converting a blower from a direct motor coupling to a belt drive system. Participants explore the implications of this change, including alignment issues and power efficiency, while seeking to understand the potential power savings from reducing the blower's operational RPM.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant outlines a design summary for a blower system, including motor power, service factor, and pulley dimensions, and seeks assistance in calculating potential power savings from the RPM reduction.
  • Another participant notes that the power savings depend on the specific blower and suggests that a performance curve is necessary for accurate calculations.
  • A participant emphasizes that the motor RPM remains constant at 1480, while the blower RPM is the variable changing in the system.
  • One reply highlights the advantages of belt drives, such as the lack of lubrication requirements and the ability to adjust pulley sizes, while mentioning minor torque losses due to friction.
  • A later reply suggests contacting the blower manufacturer for the performance curve, which is essential for understanding the blower's operational characteristics.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of a performance curve for calculating power savings, indicating that the discussion remains unresolved regarding the specifics of power savings without that information.

Contextual Notes

The discussion lacks specific performance data for the blower, which may limit the ability to accurately assess power savings. There are also assumptions about the impact of friction losses and the operational characteristics of the blower that remain unverified.

adilakbar
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Hi everyone,

I am mechanical engineer by profession. I need little help from you guys.
I am working on a blower which is directly coupled with motor. Now I am plannig to shift it to Belt Drive.
Purpose behind doing this was that we need to save power and avoid alignment issues related to it.
I have done all calculation for it summary of it is below

Design Summary

Motor Power (hp) 121
Service Factor 1.3
Design Power (hp) 157
Motor rpm 1480
Required blower rpm 700
Speed Ratio 2.11
Motor Pulley Dia (in) 7.1
Blower Pulley Dia (in) 14.9
Belt Length (in) 95
Center Distance (in) 30.20
Number of belts 10

After doing all that calculation I am stuck in one thing how much power is saved by doing this and do we need to install lower rating motor in it when we shift to belt drive kindly help in this regard.
In simple words how much power is saved when motor rpm are reduced from 1480 to output rpm 700.

Regards
Adil Akbar
 
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That depends on your specific blower. It should have a curve.

BTW, the motor rpm is still 1480, the blower rpm is what is changing.
 
Can you explain which curve are you talking about. I don't have any curve of that blower.
 
The nice thing about belt drives is they require no lubrication. You can adjust pulley sizes to achieve the desired RPM. You lose a small amount of torque due to friction losses, but, not enough to be of concern. Driving a blower coupled directly to the motor shaft is generally frowned upon.
 
The fan manufacturer will have a performance curve for your specific model of blower. I'd contact the manufacturer if you don't have that info.
 

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