18 a passive network or an active network.

18 December 2017


– This
study contribute to investigate a dynamic system of a DC motor using a tachometer
as a speed sensor. The tachometer used in this study is integral to the DC
motor. A root locus is used to design feedback compensators to improve
transient response. Mostly the systems choose based on characteristics other
than transient response. Instead of we change the original system; the system
can be compensated with additional poles and zeros. Hence, a compensated system
probably has a root locus that can goes through the required pole location within
certain value of gain. Addition of compensating poles and zeros does not involved
with the power output requirement of system but it is generated with a passive network
or an active network. Compensators can also been used to improve the
steady-state error. When a dynamic compensators are been used, it will allow us
to meet transient and steady-state error specification at the same time. Thus, we
can improve the transient response by adding a differentiation while adding an
integration to
improve the


Control systems are an integral part of the overall
system thus they must be considered from the very beginning of the design
process. We must be able to influence the response of the system to make sure
we can control the dynamic system. Both transient response and stability information
can be displayed by root locus. In order to get the whole idea of the changes
in transient response, we can sketch the locus. We can choose a desired loop
gain to achieve a proper transient response specification. A desired transient
response is flexible and can be improved when we designed transient responses
that are out of the root locus. One of the disadvantages of compensating system
with additional zeros and poles are that the system order becomes larger. Increasing
the gain will reduce the steady-state error, but at the same time the percent
of overshoot become larger. Meanwhile, when we reduce the gain to reduce the
percent overshoot we increased the steady-state error. Ideal compensators are compensators
that use original integration to improving steady-state error and original
differentiation to improve the transient response. Electrochemical ideal compensators
that often been used to improve transient response is tachometers. For passive
elements, these compensators are implemented with resistors and capacitors are
not ideal compensators. Vary advantages of passive networks are including less
expensive and it do not require any additional power sources for their


Two configurations of compensators
are cascade compensation and feedback compensation. The techniques are modeled
in Figure 1. For feedback compensation, H(s) is placed at the feedback path.
Both compensation change the open-loop zeros and poles, then it creates a new
root locus that goes through the required closed-loop pole location.