ABSTRACT
With the simple structure, high efficiency, speed performance, no sparks and no
change to the excitation loss, and many other advantages, the Brushless DC motor has
being widely used ,such as in household appliances, transportation, machine tools and
robotics fields, and modern industry .The rapid development of the brushless DC motor
control system requirements are also increasing. Therefore, as the price of the
permanent magnet materials and power electronic components are gradually declining,
the brushless DC motor will be used in an increasingly wide range of application,
which is more conducive to the development of brushless DC motor in the future.
In this paper, the development of brushless DC motor status, trends and research
works has been brief introduced first ,then describe the working principle of the
brushless DC motor. Since the characteristics of fuzzy control cannot rely on a precise
object model, In the control strategy, using the DSP-based intelligent control fuzzy
control, only need to develop proper control rules of the fuzzy reasoning can get the
appropriate amount of control, so this intelligent control strategy was selected.
Modeling in the Matlab software, and the closed-loop brushless DC motor control
system has been simulated. In the control system, the Fuzzy PID was adopted in the
speed loop, current loop was the PI regulator, the simulation result shows that compared
with the traditional PID control, the fuzzy PID control system has advantages such as
response faster, smaller overshoot, follow the better performance.
The power circuits and drive, optical isolation circuit, current detection, voltage
detection, location, signal detection, speed detection have been designed in the hardware
circuit. TI's digital signal processor TMS320 F2812 was adopted as the main chip in the
control circuit .The C and assembly language have been chosen for mixed programming
under the CCS3.2 DSP software development environment, the AD sample, the rotor
position signal read, fuzzy PID speed regulation and current regulation, PWM wave
generation and other functions have been realized. Through the whole co-debugging of
the hardware and software of the control system, The experimental results show that the
brushless DC motor fuzzy control system design is correct. Finally, the design and the
follow-up work are summarized.
KEY WORD :Brushless DC Motor, Fuzzy Control ,Matlab /
Simulink、DSP