The Controller Based DSP+CPLD Design For Switched Reluctance Motor

SRD is the second DC converter, AC speed up after the development of a new type of speed control system by the switched reluctance motor and controller of two parts. Motor for the stator and rotor doubly salient structure, the rotor windings and no permanent magnet, the stator windings have focused on the electrical structure of simple and reliable. Controller mainly by embedded microprocessors, programmable logic devices, the external interface circuit, drive circuit and control software. The highly efficient energy-saving speed control system, speed range is wide, starting current, starting torque, can be frequent starts and stops and positive inversion switch, high torque/inertia and can be compared with four-quadrant operation, etc., able to provide variable speed drive provide a good solution.Based on the analysis of SRM working principle and control technology based on the design of a switched reluctance motor controller, the controller can meet the most common occasions speed performance requirements, but also low cost, easy to promote the use of. The controller's hardware using DSP+CPLD design ideas, DSP uses TI's production of motor control ASIC TMS320LF2407, logic circuits using programmable logic devices using ALTERA a new generation of MAX II CPLD EPM240, designed a chopper circuit, position signal circuit, DSP circuit, CPLD circuit, display circuit, serial communication circuits, analog circuits and switching hardware such as the amount of input and output circuits. Controller software design using C language and assembly language, a combination of methods to meet the procedural requirements of real-time sex and maintainability. In this paper, the overall program design, and speed of calculation, angle control, location, signal processing and other procedures carried out a detailed analysis and design. This thesis solves the key problems, including upper and lower current chopping, angle control by software, anti-jamming for the rotor position signal, and how to improve the dynamic capability by calculating the rotate speed real-time and accurately, etc.In this paper, some of the key technical issues and put forward their own designs,â‘ pairs of pieces of chopped current hardware and software design, compared to a Single chopping control reduces the time limit set by low-speed run-time motor IGBT switching losses may be based control strategy needs, flexible set upper and lower limits of the current amplitude back to the poor can improve the current smoothness, reducing the torque ripple;â‘¡angle control of the software implementation can be achieved, while the angle and current regulation, compared with current reaches its maximum and then phase angle adjustment methods,2 were increased at the same time regulating the dynamic response of the motor;â‘¢position signal anti-jamming design of the software, an effective solution to the interference caused by the impact of impulse control;â‘£how location-based real-time accurate calculation of pulse speed in order to enhance dynamic response properties.Based on the design, carried out schematics and circuit board design and the preparation of the corresponding control software. Coupled with the corresponding peripheral devices, including the current sensor, silicon bridge, capacitors, IGBT and driver circuit to produce a prototype of the switched reluctance motor controller, after debugging improvements, the air compressor in use, is running well, verification the switched reluctance motor which has the advantages.