Research On FOC Algorithm And Controller Design Of Permanent Magnet Synchronous Motor

It is an inevitable trend for electric vehicles to replace traditional fuel vehicles,and motor drive systems are one of the key technologies for electric vehicles.Permanent magnet synchronous motor(PMSM)is one of the potential driving motors for electric vehicles due to its high power density,high reliability and high precision.In this paper,some key algorithms are completed and improved on the basis of fieldoriented control of permanent magnet synchronous motor,and designed the experimental controller.The design flow can be used as a reference for similar controller design.The improvement of the key algorithm is mainly based on reducing the volume of the motor and the hardware complexity of the driver.The traditional vector control algorithm for position sensorless and single bus current sensor is studied in depth,and the corresponding practical algorithm is proposed and verified by simulation.Firstly,the structure and mathematical model of permanent magnet synchronous motor are discussed in detail.Provides a theoretical basis for the later algorithm design and simulation.The traditional SVPWM algorithm process is simplified,suitable for single chip microcomputer programming;A sliding-mode observer based on back-EMF is used to estimate the rotor and speed of the sensorless motor.The single bus current sensor is used to reconstruct the three-phase current of the motor.Three methods are used to solve the unobservable area that appears during the reconstruction.Matlab/Simulink is used to simulate and verify the two algorithms,which proves the feasibility of the algorithm.The design flow of the magnetic directional controller of permanent magnet synchronous motor is completed and the hardware circuit of the driver is designed.The 32-bit STM32F302R8T6 microcontroller was used to design the software,and the related experimental verification was performed.