Reference
Tachogenerator
Error Signal
Motor Speed
Signal (Volt)
Signal (Volt)
(Volt)
(rpm)
10
0,42
0
10
71
5,53
0
71
86
14,96
0
86
146
17,69
0
146
238
22,28
0
238
Experiment 2 (Simple Close Loop Velocity Control System) some data were obtained. The
tachogenerator voltage value is smaller than the tachogenerator voltage value in the first
experiment. For the value of the error voltage in this second experiment is the result of
reducing the value of the reference signal to the tachogenerator voltage. The condition of
the error voltage value in the first experiment is different from the second experiment,
because in this second experiment there is a feedback that can reduce the error voltage
value and from our data, we use P = 1 because our reference signal is very small and can’t
use P=0,001.
Experiment Task 2
1. What kind of feedback which is used from that experiment ?
Using mosfet as a negative feedback in closed circuit.
2. How does the Proportional parameter work ?
Proportional controllers have an output that is proportional to the magnitude of
theerror signal (the difference between the desired quantity and actual value its).
Insimpler terms, it can be said that the proportional controller output is the productof
the proportional constant and its input. Changes in the input signal immediately cause
the system to directly change its output by the multiplier constant. A proportional
controller has 2 parameters, a proportional band and a proportional constant. The
working area of the effective controller is represented by the proportional band, while
the proportional constant shows the value of the gain factor against the error signal.
3. Make a conclusion from experiment 1 & 2 !
In the first experiment we used an open loop system meanwhile, in the second
experiment we use a closed loop system with negative feedback. We find that the
voltage error value on a closed loop is significantly smaller than using an open
loop. This circumstances happen because the closed loop circuit have negative
feedback that reduces the error in the system.
Tachogenerator Signal
Error Signal
Motor Speed