Research On The Inverter Of High-speed Motorized Spindle Based On DSP

Compared to analog control, digital signal processing(DSP) has many advantages such as strong anti-interference, real-time control and ease of completion of complex algorithms etc. It has become one of the main development directions of modern power electronics. This topic chooses AC motors as the control object, and uses TMS320F28335 as the control processor combined with XDS510 emulation system. The technology of SPWM is applied to control IGBT full bridge circuit under the software development environment of CCS3.3. Finally, the AC motor speed control system based on DSP is realized.This paper analyzed the property of various types of frequency control technology. The frequency control method of SPWM is applied in consideration of the driving characteristics of asynchronous AC motors and Differences in each control method under AC motor mechanical properties, job stability and software, etc. And on this basis, the hardware and software design of the inverter system are accomplished.Hardware circuit is consist of the main circuit rectifier, inverter circuit, filter circuit, IGBT driver circuit and protection circuit. After the calculation of circuit device parameters, the types of the various electronic device are selected, which is based on the electrical industry standard. Because the frequency control system is applied to 380 V three-phase AC electric and conditions, so the protection circuit is the emphasis of this design. The principle of the protection circuit is set out and multiple over-current protection circuits are designed. Finally, the circuit diagram parameter calculation and PCB design are completed.In regards to software design, the software of PWM control based on the chip of DSP F28335 is accomplished, the Mathematical model of SPWM control sampling method is settled and the formula for calculating time points is deduced. The rectifier circuit and inverter circuit are simulated with Simulink and the correctness of the system design solutions is verified. After the detection of current voltage waveform, peak voltage, RMS voltage and other parameters in the circuit, the preparation for ultimate physical structures is completed.The building of DSP Frequency Control System is completed. The output signal of PWM and SPWM control system is measured applying oscilloscope. The control system mathematical model and algorithm are verified. The experimental platform is built to control AC motors and test the motor operating parameters. Experimental results show that the frequency control system works effectively, and the desired design goal has been achieved.