外文翻譯--公共接地?zé)o刷直流電機(jī)驅(qū)動系統(tǒng)的fpga實現(xiàn)（節(jié)選）

1、附錄 附錄 ACommon-grounded BLDCM Drive System Based on FPGAPinghua Tang, Tiecai Li Department of Electrical Engneering Harbin Industry of Technology harbin, CHINA Email: tphqh@163.com; Abstract This paper proposed a kind of

2、common-grounded brushless DC motor(BLDCM)drive system based on field programmed gate array(FPGA)control. The proposed system has two characteristics: one is that the former 60° of every drive lag applies pulse width

3、 modulation (PWM) and the latter 60° conducts constantly (PWM_ON modulation); the other is that there are no isolating optical couplers between control circuit and drive circuit. So the proposed system has some adva

4、ntages such as reducing ripple of electromagnetic torque, simplifying drive circuit to reduce the delay of signals, and reducing the cost and bulk of drive system. A prototype is designed based on FPGA chip, and experime

5、ntal results demonstrated the validity of relative theory.Index Terms - common-grounded drive; BLDCM; FPGA; PWM_ON modulationI. INTRODUCTIONexpressed as (2):Ua Ra ia La Lab Lac

6、 ia eaUb = Rb ib + Lba Lb Lbc ib + eb (2) dtdUc Rc ic Lca Lcb Lc ic ec Because the rotor is permanent-magnet ,La ,Lb

7、,Lc ,Lab ,Lba ,Lac ,Lca ,Lbc ,Lcb , can be considered as constants, then,Ra=Rb=Rc=Rs La=Lb=Lc=L Lab=Lba=Lac=Lca=Lbc=Lcb=M (3)ia+ib+ic=0Therefore, we obtain the PM BLDCM voltage equatio

8、n which is shown in (4):Ua Rs ia L－M ia ea Ub = Rs ib + L－M ib + eb dtd(4)Uc Rs ic

9、 L－M ic ecThe topology of BLDCM model is obtained from (4) and shown in Fig.1.Fig.1 Topology of BLDCM modelSo, mathematical model of BLDCM can be described as (1) and (4).III. PWM_ON MODULATIONCOMMON-GROUNDED

10、 DRIVE SCHEMEAs three-phase inverter is concerned, PWM control scheme is widely applied to control the speed and current of BLDCM control system. There are following common-used PWM modulation modes: H_PWM&L_ON, H_