Watt Governor
This governor was initially used by James Watt in steam engine. The spindle is driven by the output shaft of the prime mover. The balls are mounted at the junction of the two arms. The upper arms are connected to the spindle and lower arms are connected to the sleeve as shown in Figure 14.4.
Figure 14.4 Watt Governor
Masses of the sleeves and upper and lower arms are considered as negligible for simplicity of analysis. We can ignore the frictional forces also. The ball is subjected to the three forces: centrifugal force (Fc), weight (mg), and tension in upper arm (T). Taking moment about point O
(Intersection of arm and spindle axis), we get
Example 14.2: Calculate the vertical height of a Watt governor rotating at the speed of 80 rpm. Also calculate the change in the height when the speed increases to 100 rpm.
Solution:
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