Design And Implementation Of Permanent Magnet Synchronous Motor Vector Control System For Unmanned Lifebuoy

Based on incomplete estimates from the Ministry of Health of China,about 60,000 people die from drowning in China every year.Traditional manual rescue methods have low efficiency and poor safety.Unmanned lifebuoys can provide efficient rescue in drowning situations as they can move quickly and steadily in water.The motor drive system is the core of the electric unmanned lifebuoy,and its performance directly affects the overall performance of the lifebuoy in terms of range,torque output,safety,and reliability.Therefore,studying and mastering advanced control technology for motor drive systems,especially improving system efficiency and stability,is crucial.Permanent magnet synchronous motors(PMSM)are ideal for unmanned lifebuoy applications due to their light weight,low noise,small size,and high power density.First,based on the physical structure,mathematical model,and working principle of the PMSM,this thesis derived expressions for the motor’s voltage,current,and torque parameters.Vector control was used for the motor,and the Clack and Park transformations were introduced to explain the practical significance of the PMSM vector control.Sliding mode observers and high-frequency voltage injection were used to estimate the position of the motor rotor,which was stable and efficient.In addition,an improved particle swarm optimization algorithm was used to tune the PI control parameters,which improved the stability of the control system.Adopting a seven segment space vector pulse width modulation(SVPWM)to achieve an ideal circular flux trajectory for the motor.Secondly,the thesis builds the controller hardware system with TMS320F28027 chip as the core.The hardware design circuit mainly includes functional modules such as current detection,hardware protection,and peripheral interfaces,achieving the design of the schematic and printed circuit board(PCB),and testing the hardware circuit.At the software level,the thesis adopts a vector control strategy to complete the design of the controller software level.The main modules of the controller software include the main program,interrupt programs at all levels,protection programs,and SVPWM programs.In addition,dual closed-loop control of speed PI and current PI is adopted to improve system stability.Finally,the controller is tested systematically,and the PMSM speed and torque as well as the fluctuation in the starting phase of the motor are tested using the rated power.The no-load test and load testing are respectively conducted outdoors.The experimental results show that the controller can operate at the set speed,with fast speed response and stable operation,meeting the expected design requirements.