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应用数控技术改造上世纪70年代引进瑞典ASEA公司的提升机电控系统,详细介绍了数控系统的结构组成、功能、运行参数、优点等,实际运行状态良好。 相似文献
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In order to output sine wave with small degree of distortion and improve stability,a type of inverter power supply is designed based on harmonic elimination pulse-width modulation(PWM)control.The rectifier and filter are added to input circuit of the inverter.Single-phrase full-bridge inverter performs the function of converting direct current into alternating current(DC/AC).In the control circuit,single chip micyoco(SCM)AT89C2051 is used for main control chip to accomplish the hardware design of the control system.A given value of output frequency of the inverter is input in the way of coding.According to the output frequency code which is read,SCM AT89C2051 defined harmonic elimination PWM control data which will be selected.Through internal timing control,the switches are switched under this provision of PWM control data.Then the driving signals of the switches in the inverter are output from I/O of SCM AT89C2051 to realize harmonic elimination PWM control.The results show that adding Newton homotopic algorithm of harmonic elimination PWM control to corresponding software of the control system can make the quality of output voltage of the inverter higher and it will have broad application prospects. 相似文献
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介绍了东滩煤矿采用西门子S7-300 PLC对多台空压机的各项温度、压力状态等参数进行集中监测和综合保护,并通过触摸屏实现集中巡回显示及控制。 相似文献
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