The transfer function for a P-D controller is
A. Kc(1+τD s)
B. Kc(1 +1/τD s)
C. Kc τD s
D. Kc/τD s
Answer: Option A
I believe the correct answer is Option A )Kc(1+τD s):
Because: The proportional derivative controller is used to improve the stability of control system lacking affecting the continued state error.