The Research And Design Of PMSM Servo System Based On TMS320F2812

PMSM servo system has become the mainstream of AC servo system, because ofits simple control, high efficiency, low-speed running performance, small torqueripple, small moment of inertia and high cost performance and other characteristics.With the rapid development of microelectronic technology and power electronicstechnology, greatly improved the performance of permanent magnet materials andlower prices, high-performance digital signal processor (DSP), Intelligent PowerModule (IPM) is to promote the development of AC servo control systems to digital,intelligent, high-speed, high-precision.The digital signal processor(DSP)TMS320F2812made by TI Company is adoptedas core of the control system, IGBT PIM module of Fujifilm Corp used for inversevariable device switch devices and Heidenhain ENDAT interface encoder used forposition feedback sensor in this paper． Using space voltage vector pulse widemodulation technology (SVPWM), constructe a PMSM adjustable speed control servosystem based on DSP．The paper describes the basic structure and coordinate transformation principle ofpermanent magnet synchronous motor and the motor mathematical model described inthe two-phase coordinate system. It also elaborates the vector control theory ofPMSM, analyzes the working principle of speed and current double closed loop servocontrol system based on rotor id=0field oriented control and SVPWM technique,and the system is simulated in Matlab/Simulink environment.The system uses Heidenhain optical encoder based on ENDAT interface as a rotorposition feedback sensor.The paper analyzes the working principle of the Heidenhainencoder, the interface electrical characteristics, and ENDAT2.2data transfer protocoldetailed, and design special interface circuit for Encoder. It analyzes the workingprinciple of interface, elaborates the methods and algorithms to obtain accurate valuesof the rotor position, and programes interface software. The interface can directlyconnecte with encoder by SPI and485chip, compared with the traditional interfacecircuit, which is simple, small, reliable characteristics and fully meets the servocontrol requirements.This paper introduces the design of the system’s main circuit and the schematicdiagram of control circuit, and analyzes the work principle of system hardware. Anddesign the PCB diagram of hardware, and produce printed circuit board, build a 1.82kW controller prototype for Permanent magnet synchronous motor servo controlsystem. The paper gives the software implementation for the major functional blockssuch as control, communications, and SPI interface and so on, gives the software flowchart, and completed the work in software development and debugging.Finally, we test the hardware and software of permanent magnet synchronousmotor servo control system on the experimental platform of electric drives and servodrive, the Ministry of Education Key Laboratory of Hunan University, and analyzetheexperimental results. Experimental results achieve the project requirements,indicating the correctness of the program design and control of the servo system.