13-08-2012, 04:25 PM
Controlling Speed Mechanically
Controlling Speed Mechanically.ppt (Size: 1.83 MB / Downloads: 218)
Electrical Speed Controls
Tachometer
Automotive Cruise Control
Andy Wallner’s Presentation Yesterday
Why Use an Electronic Governor?
Allows for very precise governing
Requires very limited amount of moving parts
Can fit in small areas
Easy to adjust for changes in application
Interfaces easily with other controlling devices
Mechanical Governor Shortcomings
Have a delayed response time called “droop”
This delay in response time induces something called “hunting”
Can be thought of in terms of overshoot and over/under damping
Can tune a mechanical system to minimize hunting using additional external mechanical governors
Relation to Our Senior Design Project
We are building a winnowing machine for use in Kenya
Need some sort of governing device to control the speed of our fan
Device must be simple, easy to use, and low cost
Kenyan’s background should be taken into account especially for repairs
Not much electrical experience
Bikes are major form of transportation