Research On Vector Control System Of Novel Hybrid Rotor Dual-stator Synchronous Motor

At present,most of the equipment driven by low-speed high-torque motors in China adopt the "constant speed motor + reduction gear structure".However,this drive method can no longer meet the requirements of high-end equipment driving.The elimination of direct drive method for the reduction gear mechanism is the inevitable choice for development of high-end equipment and improvement of the overall performance of the transmission system.Low-speed high-torque direct-drive motors have large output torque,and are widely used in pumping units,elevators,conveyor belt systems,mines and other occasions.Compared with the constant speed permanent magnet synchronous motor,the low-speed large-torque direct-drive permanent magnet synchronous motor has larger diameter and inner cavity space.It is an inevitable trend to use the inner cavity space to form a dual-stator motor and develop a new rotor structure.Based on the National Natural Science Foundation project,the article proposes a new hybrid rotor dual-stator synchronous motor and its vector control system,and improves the control method.The core content is as follows:Firstly,since the new hybrid rotor dual-stator synchronous motor has a special rotor structure,the rotor side is attached with permanent magnet rotor structure,and the other side uses reluctance rotor structure.After researching the structure and operation principle of the motor,the article establishes the mathematical model under three-phase stationary shaft system,two-phase stationary shaft system and two-phase synchronous rotating shaft system.Secondly,for this special structure dual-stator motor,the article deeply researches the vector control method based on the traditional PI adjustment algorithm speed controller and hysteresis adjustment current controller,then proposes a torque decoupling vector control method.The torque decoupling coefficient is used to achieve independent control of the internal and external motors,the external permanent magnet motor is controlled by id=0,and the internal reluctance motor is controlled by the maximum torque current ratio control.According to theoretical derivation,the article builds and simulates a new hybrid rotor dual-stator synchronous motor vector control system model to verify the correctness and feasibility of the proposed control method by using the Matlab simulation software and Simulink toolbox.Finally,the vector control method based on the traditional PI speed controller cannot take into account the speed and stability of the system,the article proposes a speed controller based on an improved fuzzy algorithm to replace the traditional PI speed controller.The speed controller can selects the membership functions in the fuzzy control algorithm and simplifies the fuzzy rules.At the same time,the article proposes a speed error correction algorithm to solve the problem that the load increases and the speed drops.According to the theoretical analysis,the article builds an improved control system model and conduct simulation research,by using the Matlab simulation software and Simulink toolbox,and compares with the control method before improvement.