双三相PMSM火箭发动机伺服系统冗余切换技术OA北大核心

With the development of modern rocket technology,the servo system is more and more required for the stability and reliability of thrust regulation of liquid rocket engines.As the core component of the servo system,two-three-phase PMSM adopts two sets of switchable main and backup windings to form two driving channels,which can be switched as required.However,due to the position calculation and PID closed-loop adjustment time during the hot change of the servo motor channel on duty,there will be a large position disturbance,resulting in flow fluctuation,which will affect its reliable operation.In order to solve the above problems,this study combined with the characteristics of dual three-phase PMSM,designed a drive channel redundancy switching technology of servo system based on dual-port RAM data interaction.By calculating the position information of the main and backup windings in real time and interacting PID control parameters periodically,the smooth transition of the winding of the servo motor was realized.This method not only effectively inhibits the position disturbance,but also significantly improves the reliability of engine operation.In order to verify the effectiveness of the proposed strategy,a corresponding test system was set up,and the test and data analysis were carried out under different load conditions.The results show that this technology can significantly reduce the position disturbance in the winding switching process of servo motor.Compared with the traditional switching method,the position disturbance is reduced from the maximum 16.869°to less than 0.008°,and the position fluctuation of the flow regulator of the rocket engine is controlled within the range of±0.1°.The validity and feasibility of the strategy are verified.