Study On IPMSM Weaking Field Control System For EV Traction Based DSP

Motor traction and control system are the key technologies of EV, the wide range of velocity modulation and high output( torque and power)of the system are its important research subjects. There are of great theory and technical problems to be solved. In this context, the article studied on IPMSM weaking field control system for EV traction based dsp.Based on the introduction of EV traction control technology development,the first setted up the motor model under the d-q frame of axes and then setted up the motor simulation model on the Matlab/Simulink, including the control simulation model of input d-axis and q-axes voltage, voltage and current limit model, the coordinate transformation model, torque and power model,mechanical properties model,especially setted up the curve fitting model for the important IPMSM parameters of d-axis and q-axes inductance and flux linkage.For the above ,the paper setted up the weaking fulx control system simulation model of IPMSM, under the id-iq frame of axes, deducing and drawing the equivalent torque value curves,the voltage restrictions ellipse , current limit round,deriving and drawing three segment control current curves (MTPA control, the greatest power output, the current curve control of greatest voltage limit),which obtaining maximum output. According to the three paragraphs control strategy simulate and analyze the output torque,the output power and the current phase angle characters on the whole system velocity modulation scope.Paper designed system hardware circuit with the controller TMS320F2808 DSP, elaborated on the electronic components choosing and circuits designing of the dsp, the power driven chip, power driven circuit, the motor rotor location testing, current testing and adjuvant power supply circuit and interface unit.The last part of the paper are the control system software and experiment of weaking magnetic for expanding speed, including the control system main program and subprogram .The subprogram are including initializing, interregnum service, SVPWM control, A/D transformation and dealing with the failure program, etc. Given the control program process of weaking magnetic for expanding speed and experimental device structure and experiments results. Comparative analysed the results of the experiments and simulation results.