Flameproof Variable Frequency Variable Speed Device Developed

Variable frequency speed regulation because its no matter from technical indicators and economic indicators to consider are exchanges in good speed regulation system speed in control system, which plays an important part in the field in the energy aspect, the state variable frequency speed regulation as vigorously develop project, thus becomes a modern inverter power drag key application of mature technology, ac motor speed-adjusting system has been recognized as the most modern communication in the superior performance of speed an electric power drag system.This paper introduced the 32-bit ARM processor as the core, match with SPWM special-purpose chip in SA8282, control algorithm of VVVF into - straight - pay voltage type flameproof variable frequency variable speed device (hereinafter referred to as: the design of the software and hardware converter), the heat pipe cooling technology solved inverter isolating esplosion underground coal mine with heat of conflict. In order to eliminate harmonic, saving energy and reducing consumption, the researchers did a lot of research and analysis. In this paper, first, from the principle on SPWM control technology, a detailed description of the harmonic problems pointed out the research direction and the significance of harmonic research. Then for inverter - motor systems, using Bessel function and Fourier theory respectively, the single-phase second-order SPWM inverter and three-phase SPWM inverter output voltage harmonic generation, size and distribution in the detailed and specific analysis and calculation. Through the calculation results obtained in the form of pictures, the harmonic problem is analysed and corresponding conclusion, and influence SPWM output voltage harmonic spectrum distribution factors are discussed in detail. The paper discussed on induction motor winding harmonic MMF, rotating magnetic field an induction, torque and the influence of copper consumption for induction motor, the design of variable frequency speed regulation system, motor power supply voltage harmonic analysis and additional loss calculation provides reference. Combining this topic research achievement, gives using passive LC filtering technology, RFI filtering technology solved inverter harmonic pollution, EMC (the electromagnetic compatibility) questions to xiangtan peace electric group Co., LTD. As a platform developed by fan inverter underground coal mine 45KW / 660V prototype, but for the domestic mining flame-proof frequency converter design, applied to provide the reference.This paper mainly studies the content in the following aspects:(1) The expounds after 1990's, with IGBT, IGCT and so on the new power electronics device development, DSP and the rapid development of the ASIC and innovative control theory and technology is perfect, make the variable frequency speed regulation system in range of speed, accuracy, dynamic response speed and power factor, operation efficiency and easy to use performance index more than dc speed control system, to replace the point of dc speed control by various sectors of welcome, and obtain remarkable economic benefits.(2) Completed pay - straight into the voltage type inverter -- hardware design, completed using V/F control technology of software design, application of CAD and modern machining technology completed converter of isolating esplosion shell design and processing.(3) The heat pipe cooling technology, solves the underground coal mine explosion and thermal insulation; Adopt three times, solve the harmonic stacking technique of frequency converter the problem of low voltage transfer ratio; Using passive LC filtering technology and RFI filtering technology solved inverter harmonic pollution and EMC problem.(4) Completed 45KW / 660V fan inverter of prototype development.In the end, the essay this converter device can well satisfy engineering practice demands are summarized, but still have a lot of work is worth development.In short, with modern power electronic technology, especially the microcomputer and large scale integrated circuit, the rapid development of modern control theory in the penetration of electrical control, a new range of control methods are constantly emerging, ac motor of frequency conversion technology will show more broad prospect.