| With the development of power electronics technology and the improved price/performance ratio of permanent magnet material, the permanent magnet synchronous motor (PMSM) servo system has been widely applied in many fields. Against the backdrop of the fire control searching and tracking radar of the antiaircraft artillery, this thesis designs a double motor PMSM AC servo system based on DSP to drive radar antenna, and thus realizes target auto-tracking.The current thesis develops a mathematical model of PMSM based on the analysis of the PMSM structure; and designs a double closed-loop control system of PMSM with i_d = 0 control strategy after the deliberate comparison between different vector control strategies.With regards to hardware, a control board and power boards have been designed respectively. The control board, with DSP TMS320F2812 MCU (Micro Controller Unit) being its core, expands necessary interface circuits in order to maintain external communications. The power board consists of the rectifier circuit, the inverter circuit, the power amplifying circuit, the current detecting circuit, the speed detecting circuit and the fault-detecting circuit. It receives commands from the control board, and thus controls the PMSM and fed back the detection results to MCU.In respect to software, this thesis designs closed loop control program of PMSM servo system which includes current sampling module, position detection module and velocity calculation module, PI regulation module and SVPWM module. Taking safety and interaction into consideration, the communication module, display module and recovery processing module are also designed, to be included in the closed loop control program.Based on the designed software and hardware, system debugging and experiment on the PMSM servo system are conducted. The result indicates that the design of the system is rational and the designed circuit is correct. The current research has laid a solid foundation for further research. |
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