Transient Response of a Position Controller
Transient Response of
a Position Controller
When a
step input is given to a position controller, the loop takes time to react to
the applied input. Also, depending upon the given system parameters,
oscillation can occur at the output during the transient time period. The major
cause of the time delay comes from the added inertia of the moving parts.
Therefore, the higher the inertia, there will be more delay.
Usually, the
system gain is preferred to be high to improve system response time. However,
when the gain becomes excessive, it will cause undesired overshoot at the output.
Transient response of a system can be easily observed on an oscilloscope when
the system is stimulated with a square wave input. Such an arrangement is shown
in Figure 4.
Figure 4: System diagram for Transient
Respond Experiment
The
function generator in Figure 4 provides synchronized square-wave and ramp
signals. As it is shown in the figure, the ramp signal is used to drive the
X-input of an oscilloscope. When the output voltage from Po is fed into the
Y-input of the oscilloscope, transient response curves as shown in Figure 5 can
be obtained. To get the best results, it is recommended that the frequency of
the square-wave be kept below 1 Hz.
Figure 5: Transient Response of a Position
Controller
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