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Author Question: Why are almost all large, synchronous generators rotating field generators? What will be an ideal ... (Read 98 times)

krzymel

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on: Jul 26, 2018
Why are almost all large, synchronous generators rotating field generators?
 
  What will be an ideal response?

Question 2

Assume a hydraulic proportional valve receives a 4-20 mA signal to control the hydraulic cylinder that extends or retracts to set the position of the blade pitch between 0 and 80 degrees. What current will set the pitch to 65o?
 
  What will be an ideal response?


ndhahbi

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Reply #1 on: Jul 26, 2018
Answer to Question 1

Because the there are no slip rings or brushes (or any moving contacts) between the armature and the output terminals as in the case of a rotating armature generator.

Answer to Question 2

The range of 4-20 mA is 16 mA.

16 mA/80 degrees = 0.2 mA/degree + 4 mA offset (0.2 mA x 65 degrees + 4 mA) = 17 mA.


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krzymel

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Reply #2 on: Jul 26, 2018
Both answers were spot on, thank you once again


ndhahbi

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Reply #3 on: Jul 26, 2018
Great! Please up vote :D


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