31-05-2012, 01:52 PM
Using Fuzzy Controller in Induction Motor Speed Control with Constant Flux
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INTRODUCTION
BECAUSE induction motors require low maintenance
and are robust [8], have many applications in industry
[9]. Along with industry progress, it indicates requirement to
progresses drive with high performance [8]. DC motors are
control abler than AC motors but they require much cost. In
addition, in equal power, DC motors have higher volume
and weight. Main variations in semiconductors, converters
topology, analyze technique and simulation of electrical
machines drive and newer control technique have had role in
this progress [1].
Usually classical control is used in motors drive [8,10,11].
Design and implementation of Conventional controls have
difficulties that nameable:
INTELLIGENT DRIVES
Motor drives contain three main parts: motor, controller
and power electronic unit. If with a manner, intelligence
factor is summed to one of this sections, that drive is called
intelligent drive.
Smart power switch
Smart power switch are devices that are produced with
add pieces without require to main variation in previous
design. They contain over voltage, current limiter, dV/dt or
dI/dt, protection sensors [22,23,24]. These switches are used
for switches protection against over voltage or current and
maybe wrong resultant improperly circuit connection.
Also maybe division of circuit is designed and produced
along with switch. Therefore, can increase reliability and
application range of switch, circuit complexity and drive
control system decreases so it causes simplistic design.
Intelligent control
Controller in a driver is brain and decision center that
contains two part, hardware and software. Hardware of
controller unit has progressed in recent two decades.
Software of control unit contains various control techniques
that they are programmed into hardware.
Usually classical control is used in electrical motor
drives. Conventional control is basis on know model of
controlled system [25]. When there are system parameters
variation [25] or environmental disturbance [26], behavior
of system is not satisfactory [25,26]. In addition, usual
computation of system mathematical model is difficult or
impossible [26].
LABORATORY PROTOTYPE IMPLEMENTATION
This paper is intentioned three phases induction motor
drive based fuzzy logic controller (FLC). Constant flux
technique (V/F) [10,29,31] is used for induction motor
speed control. For test of proposed fuzzy logic controller
performance, driver is implemented.
CONCLUSION
Artificial intelligent technique can is used as electrical
motor controller without requiring to system mathematical
model. By this way, efficiency, performance and reliability
of drives increase and volume, weight and cost of them
decrease. For test of performance of an electrical motor
drive, with fuzzy logic controller was implemented. It does
not require to accurate motor and drive model. Induction
motor drive was implemented with suitable speed
regulation. Steady state error in speed control is acceptable
and there is not any overshoot. Laboratory tests of speed
driver show that design and implementation are suitable.