| With the rapid development of China’s economy and the implementation of the "dual carbon" strategy,non-road mechanical engineering vehicles are also facing the situation of comprehensive electrification reform,aerial work vehicles as a kind of non-road mechanical engineering vehicles,in recent years are also widely used in various industries,but the traditional diesel engine has the shortcomings of excessive emissions,large noise,strong vibration,etc.,restricting the development of aerial work vehicles,this thesis designs a low-voltage high-power AC asynchronous servo control system for aerial work electric vehicles.The asynchronous motor is used as the controlled object to achieve the design goals of high efficiency,high power and fast response.Firstly,according to the analysis of vehicle performance requirements,the basic parameters of the asynchronous motor that meet the performance indicators are designed,the motor rotor structure,slot pole matching scheme and materials are selected and optimized,the motor structure is determined,and the motor model is subjected to electromagnetic simulation,thermal simulation and efficiency analysis,which verifies that the stability and performance indicators of the controlled motor can meet the engineering needs.Secondly,the mathematical model of asynchronous motor is established,and the double closed-loop vector control strategy based on PI control is used as the basic control strategy for research,and the M/T method encoder speed measurement scheme is determined for speed feedback measurement,in order to further optimize the control effect and system efficiency,the MTPA control scheme is introduced,and parameter identification and slip adaptive adjustment control are added to the MTPA control scheme,and the MTPA control scheme is optimized again to improve the system efficiency.Thirdly,the software framework and hardware circuit design optimization,in terms of software framework,a variety of software function modules are designed to ensure that the system can operate safely and stably,and the information exchange between the vehicle host computer and the drive is established through CAN communication.In terms of hardware design,the single-chip microcomputer is analyzed and selected,and the design and optimization of each part of the hardware circuit are carried out.Finally,an experimental platform for high-altitude working electric vehicles is built,and on the one hand,the basic performance of the motor is experimentally verified,and it is verified that the load capacity and speed response ability meet the performance requirements of electric engineering vehicles.On the other hand,the motor efficiency optimization verification experiment is carried out under the condition that the basic performance meets the standard,and various experiments verify the good performance and high efficiency characteristics of the MTPA-based AC asynchronous servo control system. |
