The electrical DC drive systems are still used in a wide range of industrial applications,
although they are less reliable than the AC drives. Their advantage consists in simple and precise
command and control structures.
The AC drives, sometimes more expensive but far more reliable, (Rajashekara et al. 1996)
require complex modern control techniques. The design of a control system is realised in two
important steps:
1. The drive system has to be converted into a mathematical model, in order to accomplish the
analysis and the evaluation of the system.
2. The imposed response of the drive system is obtained through an optimal regulator, when
external perturbations are present.
The induction motors are relatively cheap and rugged machines because their construction is
realised without slip rings or commutators. These advantages have determined an important
development of the electrical drives, with induction machine as the execution element, for all
related aspects: starting, braking, speed reversal, speed change, etc. The dynamic operation of the
induction machine drive system has an important role on the overall performance of the system of
which it is a part.
There are two fundamental directions for the induction motor control:
The electrical DC drive systems are still used in a wide range of industrial applications,although they are less reliable than the AC drives. Their advantage consists in simple and precisecommand and control structures.The AC drives, sometimes more expensive but far more reliable, (Rajashekara et al. 1996)require complex modern control techniques. The design of a control system is realised in twoimportant steps:1. The drive system has to be converted into a mathematical model, in order to accomplish theanalysis and the evaluation of the system.2. The imposed response of the drive system is obtained through an optimal regulator, whenexternal perturbations are present.The induction motors are relatively cheap and rugged machines because their construction isrealised without slip rings or commutators. These advantages have determined an importantdevelopment of the electrical drives, with induction machine as the execution element, for allrelated aspects: starting, braking, speed reversal, speed change, etc. The dynamic operation of theinduction machine drive system has an important role on the overall performance of the system ofwhich it is a part.There are two fundamental directions for the induction motor control:
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