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NGHIEN CUU • TRAO DOI

TIC H HO P B 0 DIE U TO C K Y THUA T S O DUN G

C H O NH A MA Y THU Y DIE N VlT A V A NH O

(*) TS HOANG SINH TRTJOfNG

(**) Ths. PHAM VAN DA

TOM TAT

Muc tieu cua bai viet nay de cap den md

hmh va van de tinh toan, thiet ke lam cd sd

cho viec che tao bo dieu tdc ky thuat so tien

tien vdi dieu kien trong n Udc de ap dung cho

cac nha may thuy dien vCra va nho. Tren cd

sd nhufng nguyen tac dieu khien cua bo dieu

tdc dien - thuy luc va cac thiet bj dieu khien

ky thuat sd cd tren thj trUdng trong nUdc

hien nay, chung ta cd the hoan thien hdn ve

ly thuyet dieu khien cung nhu'kha nang tich

hdp va chu ddng cung cap cac bd dieu tdc ky

thuat sd cho nhu cau trong nUdc va khu vUc.

1. GIO I THIE U

Trong nhung nam gan day, cung vdi su phat trien cua

cong nghe vi xu ly, viec nghien cuu ap dung de tao ra cac

san pham dieu khien chat luong cao ngay cang duoc quan

tarn phat trien. Bp dieu toe ky thuat so cung dupe nhieu

hang cung cap thiet bi thuy dien quan tarn phat tnen va dac

biet ap dung cho cac thuy dien cong suat vita va nho.

Bp dieu toe ky thuat so dupe tich hpp bao gom

dpng co servo thuy luc cao ap, tram thuy luc vdi thiet bi

phan phdi va bp dieu khien ky thuat so kha trinh (PLC)

[1]. Ap suat cua dau thuy luc dupe cac nha san suat su

dung thudng la 16 Mpa va nhd vay, bp dieu toe dang

nzry co dai lam viec kha rong va gon nhe, tuy vao yeu

cau cua to may. co the 6000 N.m, 10.000 N.m. 18.000

N.m. 30.000 N.m hoac 50.000 N.m [2].

Vdi kha nang xu ly nhanh. mem deo cua thiet bi

* Truong Dai hoc Bach khoa Ha Noi

** Vien Nghien ciru Co khi - Bo Cong Thuong

dieu khien ky thuat so, ta co the ap dung nhieu phuong

phap dieu khien dieu toe thuy luc nhu vong lap PID,

dieu khien du doan (Prediction control), dieu khien ben

vung (Robust control), dieu khien luan phien cue toi uu

(Optimal pole shift control), dieu khien md (Fuzzy),...

de dat dupe chat lupng dieu khien tot nhat [ 1].

2. CAU TRUC CO BAN CUA BO DIEU

T O C K Y THUA T SO

- Co cau chap harm quan trpng nhat cua bp dieu toe

ky thuat so la dpng co servo thuy luc, dupe dieu khien

boi he thong dieu khien dien - thuy luc ket noi true tiep

vbi he thong xii ly ky thuat so (hinh 1). Dpng co servo

thuy luc nay tac dpng len vanh dieu chinh va bang each

do. dan dpng he thong canh huong cua to may turbin.

- Cac thiet bi thuy luc nhu bom dau thuy luc, cac

v an phan phoi, dao chieu thuy luc...v.v, se la doi tupng tac

dpng, hay co cau chap hanh cua thiet bi dieu khien dien ky

thuat so. Cac van thuy luc tir 2-8, mo ta tren Hinhl dupe

tich hpp thanh cum panel dieu khien thuy luc hoat dpng

theo nguyen tic xung - so, cho phep ket noi true tiep vbi

he thong dung bp dieu khien ky thuat so kha trinh (PLC).

- Phan thiet bi dieu khien, hat nhan la bp dieu khien

kha trinh PLC, ta co the can cii vao cac yeu cau cu the

ve thiet bi thuy luc, yeu cau chat lupng dieu khien va

phuong phap dieu khien se dupe ap dung de lua chpn

loai PLC phii hpp.

3. CO SO LY THUYET ITNH TOAN VA

TIC H HO P B O DIE U TO C K Y THUA T SO

3.1. Cdng suat cua dpng co servo thuy luc cd thi tinh

theo cdng thuc sau, [2]:

A = (20^30)Q.VH_.Z) l(kgfm )

Trong do: A - Cong cua dpng co servo thuy luc

E | TAP CHI CO KHI VIET NAM Sd 4-Thing4 nam2011