Calculating Torque for Fan Speed

  • Thread starter Thread starter violin_writer
  • Start date Start date
  • Tags Tags
    Fan Torque
Click For Summary

Discussion Overview

The discussion revolves around calculating the torque required to spin a fan blade at a specific speed, focusing on factors such as weight, size, and operating conditions. Participants explore theoretical and practical aspects of fan operation.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant suggests that the weight of the fan blade affects the torque required, noting that a lighter fan is easier to turn than a heavier one.
  • Another participant argues that at a constant speed, the size and design of the fan are more critical than its weight.
  • A third participant points out that the speed of the fan does not have a direct impact on torque, emphasizing the importance of operating conditions such as pressure and airflow.
  • One participant introduces the Fan Laws or Affinity Laws as a potential resource for understanding the relationship between fan speed and torque requirements.

Areas of Agreement / Disagreement

Participants express differing views on the factors influencing torque, with no consensus reached on the primary determinants. Multiple competing perspectives remain regarding the significance of weight, size, and operating conditions.

Contextual Notes

Some assumptions about the fan's design and operating environment are not fully explored, and the discussion does not resolve the mathematical relationships involved in calculating torque.

violin_writer
Messages
18
Reaction score
0
Hello, I need figure out the torque is required to spin a fan blade at a certain speed. I know it doesn't particularly matter how big the fan is, but how heavy it is. I know a 1gm fan is much easier to turn than a 2gm fan.

Can anyone help me?
 
Engineering news on Phys.org
At a constant speed, it's not the weight that matters, it's the size of the fan (well, its design).

Get a fan curve from the manufacturer, this shows you the power required to drive the fan at a range of speeds.
 
...and the speed of the fan doesn't actually have a direct impact, it's the operating conditions: the pressure and airflow.
 
There are three Fan Laws or Affinity Laws that may help you get started:
http://www.nrmurphy.com/fans_laws.html
 

Similar threads

Replies
6
Views
7K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 6 ·
Replies
6
Views
4K
  • · Replies 2 ·
Replies
2
Views
3K
Replies
5
Views
3K
  • · Replies 6 ·
Replies
6
Views
4K
  • · Replies 3 ·
Replies
3
Views
2K
Replies
3
Views
3K
  • · Replies 3 ·
Replies
3
Views
3K
Replies
3
Views
14K