外文翻譯--公共接地?zé)o刷直流電機(jī)驅(qū)動(dòng)系統(tǒng)的fpga實(shí)現(xiàn)(文件)
【正文】 rcuit. This paper deduced mathematics model of BLDCM, then analyzed operational principle of the PWM_ON modulation mongrounded drive scheme which is used to BLDCM system, and simulation analysis about the proposed scheme is presented, finally, a 120W BLDCM system prototype is developed based on FPGA chip, and experimental results were analyzed.II. BLDCM MATHEMATICAL MODEL Most BLDCM drives are based on the active control to threephase inverter to obtain squarewave current of BLDCM needed in modern times. The BLDCM mathematical model which infers below in this article includes threephase inverter. The mathematical model of BLDCM is posed of two parts, namely mechanical equation and voltage equation. This paper makes the following three suppositions before introducing the mathematical model, as follows: (1) Threephase stator winding A, B, C is symmetrical in spatial distribution, the higher harmonic ponent of magnetic field is neglected. (2) The magnetic saturation and the core loss (magnetic hysteresis loss, eddy current loss) are neglected. (3)The influence factors including temperature, frequency etc. on parameters of motor are not considered. Mechanical movement equation of electric machine is fixed and won’t change with the coordinate transformation. BLDCM mechanical movement equation is as follows:Te － Tl =J + B (1)where Te is electromagnetic torque, TL is load torque, J is rotor and load inertia, B is friction coefficient,ωis rotating speed of BLDCM. Take the threephase stator voltage as the state variable. Its voltage balance equation can be expressed as (2):Ua R a ia La Lab Lac ia eaUb = R b ib + Lba Lb Lbc ib + eb (2)Uc R c ic Lca Lcb Lc ic ec Because the rotor is permanentmagnet ,La ,Lb ,Lc ,Lab ,Lba ,Lac ,Lca ,Lbc ,Lcb , can be considered as constants, then,Ra=Rb=Rc=RsLa=Lb=Lc=LLab=Lba=Lac=Lca=Lbc=Lcb=M (3)ia+ib+ic=0Therefore, we obtain the PM BLDCM voltage equation which is shown in (4):Ua Rs ia L－M ia ea Ub = Rs ib + L－M ib + eb (4)Uc Rs ic L－M ic ecThe topology of BLDCM model is obtained from (4) and shown in . Topology of BLDCM modelSo, mathematical model of BLDCM can be described as (1) and (4).III. PWM_ON MODULATIONCOMMONGROUNDED DRIVE SCHEMEAs threephase inverter is concerned, PWM control scheme is widely applied to control the speed and current of BLDCM control system. There are following monused PWM modulation modes: H_PWMamp。, 120176。 it can prevent crossconduction because of under voltage and overcurrent shutdown。不間斷的進(jìn)行脈寬調(diào)制(PWM)。關(guān)鍵詞 公共接地驅(qū)動(dòng)；無刷直流電機(jī)；現(xiàn)場可編程門陣列；PWM_ON調(diào)制策略第一章 引言由于無刷直流電動(dòng)機(jī)具有效率高，功率密度高，良好的速度特性和簡化控制等諸多優(yōu)點(diǎn)，被廣泛應(yīng)用于現(xiàn)代控制系統(tǒng)。為了在一定程度上克服上述常規(guī)無刷直流電動(dòng)機(jī)系統(tǒng)的缺點(diǎn)，本文提出了一種新的無刷直流電機(jī)系統(tǒng)，該系統(tǒng)應(yīng)用PWM_ON調(diào)制策略和共同接地驅(qū)動(dòng)器原理。進(jìn)行不間斷脈寬調(diào)制。本文接下來要推導(dǎo)的無刷直流電機(jī)的數(shù)學(xué)模型中包括三相逆變電源部分。(3)環(huán)境因素如溫度，頻率等電機(jī)的參數(shù)忽略不計(jì)。其電壓平衡方程可以表示為(2):ua R a ia La Lab Lac ia eaub = R b ib + Lba Lb Lbc ib + eb (2)uc R c ic Lca Lcb Lc ic ec 由于轉(zhuǎn)子是永磁體，La ，Lb ，Lc ，Lab ，Lba ，Lac ，Lca ，Lbc ，Lcb ，可視為常數(shù)，那么，Ra=Rb=Rc=RsLa=Lb=Lc=L Lab=Lba=Lac=Lca=Lbc=Lcb=M
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