7.1 Conclusion
7.1 Conclusion
7.1 Conclusion
CHAPTER 7
7.1 CONCLUSION
The responses of the BLDC motor drive during starting, the load
perturbations, the change in the set speed and speed reversal, were studied and
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compared with the ideal waveforms and also with the waveforms available in
the literature. The results of the simplified simulation model were compared
with those obtained from the hardware setup. It is found from the studies that,
the performance of the simulation model matches well with the experimental
results. The motor model has been considered to evaluate the performance of
the sensorless control technique and other AI control techniques.
When the GA was applied for the direct tuning of the PI controller,
the speed response of the drive was better than the PI controller in terms of
the integral of absolute error, rise time and settling time. The GA tuned PI
controller showed good improvement in the performance, when compared
with the manually tuned PI controller in terms of the time domain
specifications; but it requires automatic adjustment of the controller gains to
adapt to the dynamic operating conditions.
A simple FLC was designed to study the direct impact of the FLC
on the speed responses of the BLDC motor drive. A comparison of the simple
FLC with the PI controller showed, that the FLC gave a poor performance
when compared with the PI controller. The speed response was oscillatory in
nature with an overshoot and takes more than 3 seconds to reach the steady
state. The only transient in which, the SFLC is superior to the PI controller is
its performance during the load perturbations. It takes a comparatively lesser
time to reach the set speed. It is concluded that the SFLC cannot be used as
such in motor control applications which needs proper tuning.
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terms of the better computational time, and integral of absolute error, rise
time, overshoot and settling time of a BLDC motor drive.
The results and issues identified during the course of this work give
rise to a number of possible directions for the future work. Some of them are
briefly summarized below.