Research On An Advanced Fuzzy Adaptive Vector Control System Of PMSM

Permanent Magnet Synchronous Motor(PMSM)is widely used in machinery manufacturing,aerospace,power system and other fields because of its advantages such as simple structure,small size and high efficiency.Nowadays,the traditional PI vector control strategy based on positionless sensors has problems such as poor motor dynamic characteristics during the process of continuous acceleration and deceleration.This problem is even more pronounced when the motor is running at low speeds.In view of the above problems,the research of this thesis is as follows.(1)The dynamic characteristics of the PMSM under the traditional PI vector control during continuous acceleration and deceleration are not ideal,Because the motor dynamic characteristics of PMSM based on traditional PI vector control are unsatisfied during the continuous acceleration and deceleration process.An improved fuzzy self-tuning PI control strategy which integrates the idea of fuzzy control into the PI control system is proposed.Taking into account the uncertainty of the motor model,the on-state voltage drop of the IGBT switch tube,the DC bus voltage fluctuation,the error caused by the inverter's dead time and other factors on the motor speed,a dead time observer is added to the proposed control strategy.Through MATLAB / Simulink simulation analysis,the proposed control strategy can improve the steady-state control performance of the motor and can ensure good motor dynamic control performance during the continuous acceleration and deceleration process of the motor speed.(2)In order to verify the practical application ability of the proposed control strategy,an experimental platform of Permanent Magnet Synchronous Motor based on DSP + FPGA hardware structure is set up to conduct the experimental analysis.The structured motor control system experimental platform uses FPGA to collect and calculate motor resolver acquisition signals,bus voltage signals,bus current signals,and motor phase current signals.The calculation results are sent to the DSP through the address bus and data bus addressing,which avoids the delay problem directly based on the DSP and shortens the communication signal transmission time.Through the experiments,the correctness of the simulation results and the practicability of the control strategy are verified.