Research On Synchronous Control System Of Dual-redundancy And Dual Motors

Currently,Auxiliary Power Unit(APU),as a kind of gas turbine power system which does not rely on any external power,is widely used in military aircraft.The APU intake door actuation system is used to control the opening angle of the APU intake door.The traditional intake door actuation system makes use of hydraulic actuator,which has some shortcomings,such as oil leakage,heavy pollution,poor maintainability and difficult signal combination.The Electro-Mechanical Actuator(EMA)converts the rotary motion of motor into linear motion through screw.With the advantages of no hydraulic system and high efficiency,EMA is gradually replacing hydraulic actuator.However,the traditional EMA has a high failure rate.For improving the system reliability,fault tolerance and output efficiency,the Dual-redundancy Permanent Magnet Synchronous Motor(DR-PMSM)is used as the control object.The synchronous control system of dual-redundancy and dual motors applied to APU is studied.The main research content and results of this paper are as follows:Firstly,the topology structure of DR-PMSM control system is analyzed.The electrical redundancy mode of "dual CPU+dual drive" is adopted.The control channels of the topological structure are completely independent,which effectively improves the reliability of the whole system.For researching convenience,the mathematical models of DR-PMSM in three-phase static coordinate system and two-phase synchronous rotating coordinate system are set up separately.The first-order Active Disturbance Rejection Control(ADRC)is used in the speed loop and PI control is used in the current loop.Meanwhile,the speed control of the DR-PMSM system is carried out by combining the space vector modulation.The simulation model of DR-PMSM control system is built through Matlab/Simulink.It is verified that the control strategy proposed in this paper is superior to the double PI control strategy in response speed and anti-interference performance.Secondly,for synchronous control system of dual-redundancy and dual motors,a variable structure synchronous control strategy is proposed to realize the speed synchronization of the dual motor.When the two motors are working normally,the fuzzy PID control algorithm is added to the traditional cross coupling control structure;when a redundancy fails,the improved master-slave synchronous control strategy is used to make the normal motor follow the fault motor,and the synchronous redundancy switching strategy is used for the two motors to remove the fault redundancy as a whole and increase the normal redundancy output power to 100%.By Matlab/Simulink,the simulation model of synchronous control system of dual-redundancy and dual motors is established,which verifies the feasibility of the variable structure synchronous control strategy.Thirdly,according to the performance requirements of the APU intake door actuation system of a certain type of aircraft,the hardware and software design of the 270V/800W DR-PMSM controller were carried out.The core components were analyzed and selected.The TMS320F28335 in TI’s C2000 series was chosen as the main control chip to complete the hardware circuit design and software program design of the synchronous control system of dual-redundancy and dual motorsFinally,the test platform of synchronous control system of dual-redundancy and dual motors was built to test the performance of DR-PMSM control system and synchronous control system.The results show that the synchronous control system of dual-redundancy and dual motors has good dynamic response performance and synchronization performance,and achieves the expected goal.