Question
Download Solution PDFThe armature reaction effect is high in ________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFArmature resistance control
We know that,
\(N\space \alpha \space {E_b\over \phi}\)
\(N\space \alpha \space {V-I_a({R_a+R})\over \phi}\)
As the armature resistance control method involves additional resistance in series with armature resistance, the power losses are high. Thus, efficiency is minimal in this case.
We can control the speed by increasing armature resistance. This method gives only below base speeds. This method is a constant torque and variable power drive.
Field control method
\(N\space \alpha \space {V-I_aR_a\over \phi}\)
By varying flux, we can increase the speed more than its base speed. This method is constant power and variable torque drive.
In the field weakening method, we are reducing the working flux to increase the speed, by reducing the field current. Therefore, the effect of armature flux on main field flux will increase in the case of the field weakening method.
The characteristics are shown below:
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