Measurement And Modeling And Control Research Of Switched Reluctance Machine Based On DSP

Switched Reluctance Driving (SRD) system is a new type of AC driving system which has such characteristics as simple and robust structure, reliability, low rotor inertia, low cost and control flexibility. Also, it can get various mechanical characteristics and has a high efficiency in a wide speed range. Therefore, SRD has board prospects in the field of power transmission. Because of the double salient structure of the machine and high saturation of magnetic circuit, the flux linkage is a nonlinear function of both rotor position angle and phase current, which brings difficulties in accurate modeling of the machine. Therefore, the flux linkage characteristic measurement and accurate modeling of the machine are being widely studied.With the development of the SRD system, computers and microprocessors which were used for the control system can't provide a high frequency operation environment for the machine. Performances of digital signal processors (DSPs) make it operate in high frequency. The paper presents a magnetic characteristic detection system with DSP TMS320F2812. Real-time phase voltage and current signals are acquired using ADC module. According to flux linkage indirect measurement principle, the data is sent to PC and the flux linkage is calculated by discrete method. Then, the curves of flux-current are protracted. Experimental results show that the magnetic characteristic detection system with DSP can draw flux-current characteristic curves accurately. It supplies training data for rotor position estimation from flux linkage and current.The rotor position can be estimated by using the unique relationship between rotor position, flux linkage and phase current. Adaptive network fuzzy inference system (ANFIS) which is used to map this relationship is developed in the paper. Flux linkage and current as inputs, the rotor position as outputs, therefore the motor model is established accurately by ANFIS. This makes foundation for elimination of position sensor.The paper gives switched reluctance drive system based on DSP TMS320F2812. SRM operates using two-phase start and voltage PWM control and PI speed-loop adjusting. It was given detailed hardware design of control system and software flow chart with C language modular programming. In order to verify the correctness of the control system design, it gives experimental waves of hardware and software debugging. Also, it makes hardware foundation for elimination of position sensor.