Automatic Control System Design Based On Dsp In The Center Of Gravity

The position of barycentre on plane directly impacts the stabilization and manipulation of plane.This paper ,on basis of analysis in aeroplane framework and the factors that affects barycentre position,established the mathematical model of control system.The model points out the realization of barycentre control by the medium of motor control.On these grounds,designed the scheme of barycentre control system.On consideration of the reliability and maintainability requisition in aviation field,made a choice of sensorless permanent magnet brushless DC motor (BLDC) as implement mechanism. By investigating and analyzing the problems emerged during the system designing process, solutions had been provided.(1)The actuality that distinguished aeroplanes frameworks and weights difference,for the sake of generality of control system and degradation of recreate costs,designed the CAN bus network based on workstation and monitor module.Monitor module primarily accomplished parameters collection and motor control,with TMS320F2812 as core.Current reference speed that send out to monitor modules are caculated by workstation.(2)Considering the difficult synchronisation in multiple nodes communication,gi-ven the method for bit-time computation,resolved the bus arbitration by adopting remote frame request and automated acknowledge manner,actualized communication expenses minimization.(3)In order to be content with the requirement of flow parameter acquisition, on basis of DSP as core designed pulse acquisition circuit and current acquisition circuit after selected the type of the sensor.(4)The fact that the position information of motor rotor can not be acquired directly,this paper expatiated on the excogitation proposal that the zero-crossing of back-EMF are detected and delay 30°.The reasons causing rotor position error in the...