| The control component of the power drive unit of an aircraft cargo system is a bridge connecting the freight motor and the upper computer,which plays the role of condition monitoring,motor control and interconnection communication.In the face of more severe air cargo demand in the future,control components should also meet higher standards in miniaturization,high temperature resistance,anti-interference and other performance.Therefore,research on the technology of control components of the power drive unit is carried out to improve the modularity and control components.The design method and process method have practical significance and engineering application value.In this paper,the control component of the power drive unit of an aircraft cargo system is taken as the research object,and a set of control component overall design process is proposed.The hardware system design and improvement are studied,including the design and improvement of the miniaturization control circuit based on the STM32 microcontroller,the PCBA design of the control module of the high density electrical interconnection,and the removable non-standard die based on 3D printing.The contents and achievements of this paper are as follows:(1)A hardware circuit design scheme for control components under specific volume constraints is selected.First,the requirement analysis of control components is carried out to determine the function,performance and adaptability of the control components.The module is divided into modules by modularization,and various design plans of various functional modules are given.The adaptability and functional objectives are taken into account.The feasibility of each module is analyzed,and the best circuit design scheme is selected.The anti-interference design is added to the circuit,and the control component circuit is further improved.(2)A removable non-standard mold based on 3D printing technology is developed and a set of potting filling process with embedded threaded holes is explored.Based on theoretical investigation and experimental verification method,the epoxy encapsulation adhesive is selected as the packaging material of control components.Based on 3D printing technology,a recyclable dismantling non-standard mold is designed and manufactured,and the screw positioning board is made precisely with the control component PCBA.(3)A removable non-standard die based on 3D printing technology is developed and a set of filling technology for the filling body with embedded threaded holes was explored.Through theoretical investigation and experimental verification,epoxy filling glue was selected as the packaging material of control module,and a set of detachable non-standard dies and positioning plates with embedded threads were accurately manufactured with PCBA control module,and a set of filling technology suitable for embedded threaded holes was explored.Finally,the possible heat dissipation of three-terminal bidirectional thyristor in the encapsulation body is estimated,and the conditions under which the control module encapsulation body can heat well at-40?~70?are obtained.(4)The function and performance of the control module are tested and the circuit is improved.According to the principle of early detection and early processing,the function and performance of the control module are tested in the control component PCBA production stage.Aiming at the problem of false detection caused by external light interference caused by the control components in the early photoelectric detection,the PWM modulation and filtering circuit are improved to improve the detection effect.According to the criterion of function and performance,the adaptability test(EMC test and environmental test)of the control component filling body is carried out,and the test results are all up to standard.Finally,the finished product of the control module which meets the expected function,performance and adaptability proves the feasibility of the whole design scheme of the control module studied in this paper. |
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