| Servo systems are ever-increasingly utilized in many fields, including industrial controllers and household appliances. Meanwhile, higher control performance of servo products with lower cost is also being a subject of great interest worldwide. Digital controlled AC servo systems, based on Permanent Magnet Synchronous Motors (PMSM) as power converters with advanced control strategies, implemented in Digital Signal Processor (DSP), will be a trend.The mathematical model of PMSM is presented by studying PU model of PMSM. With the theory and characteristic of PMSM vector control analyzed, and the Field Oriented Control (FOC) strategy employing i_d = 0 chosen, the control scheme of PMSM servo system is established with three close-loop regulators. Meanwhile, the detailed designs of the servo control system and some servo control strategies are proposed, based on which, simulation studies are carried out. As a result, the validity and feasibilities of the control strategies and the associated servo control methods are proved by simulation results. Then, with software design accomplished in Codewarrior and the PC control interface implemented on the basis of PC Master, the hardware system of digital servo control based on MC56F8357 is built as an experimental platform. Experimental results and practical utilizations substantiate that the hardware platform and the associated software design can supply good position servo control capability;indicating the servo control system can greatly meet the required performance of servo control.
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