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1、基于FPGA直流电机的PWM控制转速闭环系统设计BasedonFPGAdirectcurrentmachine’sPWMcontrolrotationalspeedclosedloopdepartment摘要在电力拖动系统中，调节电枢电压的直流调速是运用最广泛的一种调速方法，而PWM控制技术具有主电路简单、开关频率高、电流容易连续谐波少、低速性能好、稳速精度、高调速范围宽等优点，所以直流PWM调速系统的应用日益广泛。转速、电流双闭环控制直流调速系统具有良好的静态、动态特性，是应用最广的直流调速系统。本课题是设计一个转速、电流双闭环的H型
2、双极式PWM直流调速系统。在该系统中运用EDA技术，基于FPGA可编程逻辑控制器件，用VHDL语言编程实现PWM控制。本设计主要采用IGBT管是因为它通流能量强、开关速度快、热稳定性好，所需驱动电路功率小而且驱动电路简单。因为双极式控制电路在工作时，可能4个开关器件都处于开关状态，而且在切换时可能发生上、下桥臂直通的事故，为了防止直通，在上、下桥臂的驱动脉冲之间，要设置逻辑延时。本设计主要完成了H型双极式PWM直流调速系统的主电路、转速调节器、电流调节器、检测反馈环节和过流保护环节等的电路设计以及参数的计算，并按双闭环的工程设计方法进行
3、了转速调节器和电流调节器的参数的设计。关键词：直流电机，双闭环控制，PWM直流调速系统，IGBT25ABSTRACTIntheelectricdrivesystem,themostwidespreadonevelocitymodulationmethodisadjuststhearmaturevoltagethedirect-currentvelocitymodulationutilizes,butthePWMcontroltechnologyhasthemaincircuittobesimple,theturn-onfrequency
4、ishigh,theelectriccurrenteasycontinualovertonetobefew,low-speedperformancegood,steadyfastprecision,highgovernordeflectionwideandsoonmerits,thereforedirectscurrentthePWMvelocitymodulationsystem'sapplicationtobedaybydaywidespread.Therotationalspeed,theelectriccurrentdouble
5、closed-loopcontrolcocurrentvelocitymodulationsystemhasthegoodstaticstate,thedynamiccharacteristic,appliesthebroadestdirect-currentvelocitymodulationsystem.Thistopicisdesignsarotationalspeed,electriccurrentdoubleclosedloopHdouble-poletypePWMthedirect-currentvelocitymodula
6、tionsystem.UtilizestheEDAtechnologyinthissystem,basedontheFPGAprogrammablelogicalcontrolcomponent,realizesthePWMcontrolwiththeVHDLlanguageprogramming.ThisdesignmainlyusestheIGBTtubeisbecauseitsthroughflowenergyisstrong,theshutterspeedisquick,thethermostabilityisgood,andt
7、hedrivingcircuitpowertobesmallmoreoverthedrivingcircuittobesimple.Becausedouble-poletypecontrolcircuitinworktime,thepossible4switchcomponenttobeaton-offstate,moreoverwhencutpossiblyhasthetopandbottombridgearmnonstopaccident,topreventtogononstopto,betweenthetopandbottombr
8、idgearm'sdrivepulse,mustestablishthelogicaltimedelay.ThisdesignhasmainlycompletedtheHdouble-poletypePWM
