Research And Development Of The Full-digital AC Main-spindle Drives

With the development of science and the competition of world market, the performance of main spindle drives is required higher and higher. Therefore, facing the chance of the 21st century, the research and development of main spindle drives is necessary. The paper presents a scheme of fully digital AC main spindle drives system based on field-oriented control (FOC) and digital signal processor (DSP). The following is its main subject. From the point of FOC, it reveals the essence and key of the AC induction motor. It studied the principle and implementation of vector control of AC induction motor, and draw the base for scheme of AC digital unique control. Based on the design principle of standardization and oneness, a scheme of fully digital AC drives system base on digital signal processor (DSP) is studied and achieved. A study platform with plentiful hardware and software has been developed. Normalize is used in study in order to simplify the calculation and modification of parameters and to get higher calculation speed and control precision. Adequate discuss was given to the special problems and the factors which affect the performance met in the digital control. To obtain the better performance, we change the period of speed-loop and the PI parameters on-line. The key of the fully digital PWM speed regulation system is how to get the PWM signals on-line. Normally there are two algorithms of PWM wave, i.e. the traditional SPWM method and the latter SVPWM method. These two methods have been analyzed and compared in the paper. The result shows that the SVPWM is superior to the SPWM in many respects. And it also introduces the design of multi-axis AC drives based on CPLD&DSP.