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Ngoai ra, dieu khien chuyen ddng tao ra cae ehde nang cap cao, do dd ban cd the thi/e hien eac dng dung tiiy chinh mdt each cd hieu qua di/a tren viec xay di/ng cac khdi de tao ra ca[r]
(1)C6NG NGHE LTNG DUNG
Nhiimg cd sd nen tang cua
Position Cunent
l i I Amplifier ^
^^^B- Mechanical
t
Feedback Device
Position
Hinh Bd dieu khien chuyin dong la trung tam ciia he thong dieu khiin chuyin dong
Cac yeu cau cua dieu khien chuyen dpng
odng ed thdng dung nhat mdi tru'dng edng nghiep va mdi tru'dng nhung la ddng ed bddc, ddng cd ehoi than va dpng ed DC khdng chdi than, nhien edn ed nhieu li/a chpn khac Moi ddng ed ddi hdi cac tin hieu dau vao rieng giiip lam quay ddng cd va chuyen dien nang ed nang Xet d nghia rdng nhat, dieu khien chuyen ddng giup ban sd dung ddng cd nham dap dng tdt nhat cac yeu cau dng dung cua ban ma khdng can phai giai quyet tat ca cac van de truyen tfn hieu cap thap can thiet de lam quay ddng cd
Ngoai ra, dieu khien chuyen ddng tao cae ehde nang cap cao, dd ban cd the thi/e hien eac dng dung tiiy chinh mdt each cd hieu qua di/a tren viec xay di/ng cac khdi de tao cac giai phap thi/c hien cac tac vu thdng thu'dng nhd dinh vi chfnh xac, ddng bd hda nhieu true, ehuyen ddng vdi tdc do, gia tdc va ham tdc xac dinh Do hau het ddng cd du'dc van hanh hoan canh tam thdi, cac cdng cu dieu khien ehuyen ddng can thiet de thfch u'ng vdi tai khac va dieu kien thay dd'i, ddi hdi thuat toan dieu khien xd If phde tap va phan hdi thdng tin t d he thdng ed khf Cudi eung nhu'ng khdng kem phan quan trpng, cae tac vu chuyen dpng thddng cd y nghia dac biet va thu'dng sii dung may mde cd the gay hai cho ngu'di xung quanh Do vay, eac ehde nang an ninh nhu' cdng tac gidi han va cac kenh I/O ddde sd dung de thu thap thdng tin trang thai ddng thdi thi/c hien cac thii tue
ddng cat
Cac phan he thong dieu khien chuyen dpng
Sd dd tren hinh minh hpa cae phan thiet yeu cua mdt he thdng dieu khien chuyen ddng
Oac tru'ng ddi vdi dng dung cua ban la phan mem dng dung ma ban phat then Phan mem ifng dung bao gdm nhieu Idp chpn Thu'dng thi cd mdt dng dung giao dien ngddi sd dung cung cap kha nang tu'dng tac ngu'di van hanh Rat nhieu cac dng dung chuyen ddng ed cac Idp dng dung xd If canh bao va ket ndi cd sd dO' lieu de ndi vdi mot he thdng SCADA Chiing cung ed eac hu'dng dan dieu khien ehuyen ddng dddc thi/c hien bdi bp dieu khien chuyen ddng Nha san xuat bd dieu khien ehuyen ddng tao moi tru'dng phat
trien ma ban sd dung de phat trien phan mem dng dung
Vdi chi dan da dddc nhae den d tren, bd dieu khien chuyen ddng tao cac profile chuyen dpng Di/a vao cac profile nay, bd dieu khien girl cac tin hieu (thu'dng la eac tin hieu ±10 V hoac tfn hieu bdde va tfn hieu djnh hu'dng) thdng qua mot bo khuyeeh dai, hay mdt truyen ddng tdi dpng cd Nhiem vu cua bd khuyeeh dai la du'a tfn hieu t d bp dieu khien va bien ddi chung tin hieu lam cho ddng ed ehuyen dpng
Khi dpng ed chuyen ddng, thiet bi phan hoi thu'dng la mot cam bien vi tri -dda thdng tin vi tri trd lai bd dieu khien de ddng vdng lap dieu khien T d cam bien vi trf nay, bd dieu khien chuyen ddng biet du'dc vi trf cua dpng ed va cd the suy dddc van toe ma ddng cd dang ehuyen dpng Mac du cac thiet bi phan hdi cung cap phan hdi vi trf, ddi la thdng tin phan hoi dac biet nhu' d d lieu t d mot cam bien ap suat hay cam bien dp rung, can dddc gdi trd lai bd dieu khien
Kien true bp dieu khien chuyen dpng
Mdt bp dieu khien chuyen dpng ddng vai trd nhu' bd nao cua he thong dieu khien chuyen ddng va tinh toan tdng quy dac ehuyen dpng theo yeu cau Bp dieu khien chuyen ddng sd dung cac quy dao ma no tinh toan de xac dinh lenh momen xoan thich hdp de gdi tdi bp khuyeeh dai dpng cd dong thdi gay chuyen dpng Bp dieu
Trajedtory Generation (ms) Supwvisory Conlrol
(ms) (with Interpolalioii) Control Loop (MS)
UO
Updates Tra|ec<ory Generator Basa>d on
VO And User
Response Sensot
Hinh Klin true bo dieu khiin ehuyen dong
(2)_UUNU NCiHt U N G D ^ N G
dieu khien cliuyen dong
Hinh Cae bo dieu khien chuyin dong plug-in DSP-Based
Hinh Cae bq dieu khien chuyen dong tiiy chinh sir dung LabVIEW NI SoftMotion Module
khien cung phai ddng vdng lap dieu khien va quan li dieu khien giam sat bang each giam sat cac gidi han va diem ddng khan cap nham dam bao hoat dpng an toan Moi mot hoat dpng can phai dien thdi gian thi/e nham dam bao dp tin cay, chinh xac, on dinh va an toan cao d mde can thiet de tao mot he thdng dieu khien chuyen dpng cd kha nang hoat ddng
Cac nhiem vu khac ma mot bp dieu khien ehuyen dpng phai thi/c hien, gom:
Di'eu khien giam sat - Cung cap
chuoi lenh va sd phoi hdp can thiet de
thdc hien cac hoat ddng cu the nhd sau: - Khdi tao he thdng
- Quan li Sl/ kien - Phat hien loi
Tao quy dao Vong lap di'eu l<liien
I/O
National Instruments (NI) dem den each tiep can de trien khai cac he thdng dieu khien chuyen dpng cdng suat cao:
Cac bd dieu khien chuyen ddng plug-in DSP-based cho PCI hoac PXI
Cae bd dieu khien chuyen ddng sd dung NI LabVIEW NI SoftMotion Module
Bd dieu khien chuyen dpng plug-in DSP-Based
NI cung cap cae bd dieu khien chuyen ddng plug-in t d cac bd dieu khien cdng suat cao dap dng cac yeu cau phdc tap den cac bd dieu khien chuyen ddng chi phf thap hdn phuc vu cac dng dung chuyen ddng diem tdi diem vdi cdng suat manh me Oe dam bao tdc dp cap nhat servo cao tdi 30 kHz cho cac dng dung cd dp chfnh xac cao, cac bp dieu khien sd dung kien true bd xd If kep Hai bp xd If nay, mdt la bd xd If trung tam (CPU) va mdt bd xd If tfn hieu sd (DSP), tao "xUdng sdng" cua bd dieu khien chuyen ddng NI
Bp dieu khien CPU la mdt bd vi dieu khien 32-bit chay he dieu hanh da nhiem, thdi gian thUe, nhung Bd CPU cung cap cdng suat va si/ chinh xac can thiet de dap dng hau het cac nhu cau dng dung chuyen dpng phdc tap nhat CPU xd li cac lenh, ddng bd hda host, tu'dng tac I/O, va giam sat he thdng
DSP cd nhiem vu chinh la ddng thdi dieu khien vdng lap kin vdi vi tri, quy dao tren nhieu true Nd eung ddng cac vdng lap vi tri va van tdc, tri/c tiep dat lenh momen xoan cho bp truyen ddng hoac bd khuyeeh dai
Bp xd li dieu khien chuyen ddng du'dc giam sat bdi mdt bp dinh thdi giam sat, la mot phan cdng ma ban sddung de t i / ddng dd cac loi phan mem va reset bp xd li neu cd sd cd xay Bp dinh thdi giam sat kiem tra hoat ddng cua bd xd li Neu phan chu'dng trinh tren bd dieu khien
(Xem tiep trang 22)
(3)CdNG NGHE U'NG DUNG
Quyet djnh cdng tac
Nhan vien ky cdu cua DuPont cho hay giong nhd template hoac Id trinh cho ket cau cua cac doanh nghiep, CPAS da that sd la mdt cdng nghe rat hdu ich, dat mde cua Model ISA95, bao phd thiet bi nha may thdng qua hoat dpng va dieu khien qua trinh san xuiit Chinh viec tap trung vao sd cdng tac da khien cho cdng ty DuPont dat dddc tinh thdc thi trien khai he thdng dieu khien phan tan tren khap the gidi, vay: "mdt dd cd the van ngdi d van phdng tru sd ma van cd the quan sat va nhan dddc thdng tin cung vdi thdng tin t d doanh nghiep tren cdng mdt man hinh" Woll cung nhan manh v'e tap trung vao diem manh cua CPAS "Chung ta cd the ndi ve cdng nghe- di'eu bat ky, thdng tin xd ly chung va tiit ca vat lieu khac" "Tuy nhien muc dich sd mdt eda CPAS la thuc day viec phan phdi dng dung gidp cho khach hang cd the thu ve ldi nhuan"
Tiep theo la gi?
Mai sau thi Woll cung da chuyen sang chu de ve viec md rpng tam nhin cho CPAS va ARC dddc ky vpng la se cdng bd ban nghien cdu v'e CPAS 2.0 thi trUdng tac gia la Woll vao dau thang
Woll cho biet, hdn 20 nam qua, cdng nghe t d ddng hda qua trinh da dat dddc nhieu tien bd, nhdng khdng he cd cuoc cai to nao dien ra, va khach hang sd dung mai sau mdi dat cau hdi ddi vdi ARC la hp ky vpng gi vao the he tddng lai eda tdddng hda qua trinh Ndi dung cua ban bao cao CPAS 2.0 nham tra Idi cau hdi dd Ban bao cao dda cai nhin chi tiet v'e nhieu tien bd tien doan trddc "dieu chdng ta nen can nhae la cude each mang diln t d nhien" Hien nay, khoang 75% thdi gian chet cua thiet bi xay ngddi sd dung khdng dn vao tin hieu t d thiet bi cung ciip Thiet bi thdng minh cd the bao nao thi d tinh trang tdt va nao thi bi loi "NhUng dieu dd chda dd tdt", Woll cho hay "Chung tdi tin rang nhdng thiet bi thdng minh se cd kha nang ndi vdi ban rang chung cdn d tinh trang hoat ddng tdt bao lau nda va dda dU doan ban se cd the tin vao ket qua ma chung dda bao lau nda"
Hien nay, tren thi trddng cd mdt sd ddng san pha'm dap dng yeu cau sd dung SEVA hoac edng nghe t d danh gia, dda theo tieu chuan BS-7986 cua Vien Tieu chuan Anh, Woll ndi NgUdi sd dung se chd ddi sU xuiit hien eda nhi'eu thiet bi thdng minh hdn nda tddng lai
The he tiep theo cua CPAS se dda tren ciiu hinh lEC 61499 va tieu chuii'n lap trinh, tieu chuan khdng yeu cau dich vu chia se Oieu se dda nen tang chuan hda de phat trien he thdng t d dpng hda cd model rieng vdi qua trinh phan tan va dich vu dpc lap, Woll cho hay He thdng qua trinh phan tan se cung cap sUtUtri cho cae ngudn he thdng khac va se ho trd deu chuan edng nghe cua FIPA
Vdi cdng nghe nay, neu he thdng gap sU cd bat thudng thi nd se cd kha nang tU ciiu hinh lai thdi gian thdc de bd lai sd bat thddng dd, va se tiep tuc van hanh "Oieu cd nghTa la chung ta se cd nhieu kha nang sd dung he thdng tU ddng hda vdi thdi gian chet la 0" Woll chi TUdng t d nhd vay, he thdng se cd kha nang ciiu hinh lai de thich dng vdi nhdng sd bat thddng dddc phat hien may mde ma chdng dang dieu khien, tang kha nang dn dinh hdn
3 budc
Chu d'e thd va cuoi edng CPAS 2.0 ma Woll chia se d day bao gdm nhdng khd khan ma ngddi sddung gap phai, hp cung chinh la ngddi can phai dda nhdng thay dd'i hoac cap nhat cho he thdng ma khdng dddc ddng cat may hoac qua trinh van hanh Ngay quy trinh dd bao gdm bddc la tai phien ban phan mdi eho bd dieu khien dd phdng hoac dd thda va ap dung phan mem dd vao qua trinh san xuiit Oay la mot giai phap kha mao hiem va "dddng nhd khdng thdc thi" Woll ndi
"Chung tdi tin rang se ed quy trinh bddc: tai phien ban phan mem mdi cho bp dieu khien, thd nghiem van hanh de dam bao he thdng hoat ddng nhd dd doan va ban da hai Idng vdi ket qua thi ban se ap dung phan mem dd vao qua trinh", Woll cho biet
M.H (Theo Automationworld.com)
NhuTng cor sd nen tang
(Tiep theo trang 17)
chuyen dpng khdng the thdc hien cac ehde nang 62 micro giay, bp dinh thdi giam sat se reset bp dieu khien ehuyen dpng va khdng eho phep giao tiep eho den ban reset hoan toan bd dieu khien ehuyen dpng Dieu giup dam bao hoat dpng thdi gian thdc eda he thdng dieu khien chuyen ddng
Cac thiet bi chuyen dpng dang plug-in PCI-hoae PXI-based dddc thiet ke de dieu khien tin cay va chinh xac he dieu hanh Windows hoac he dieu hanh thdi gian thdc Chung giiip giam thdi gian phat trien thdng qua eac APIs] manh me va ho trd cac cdng cu tddng ta nhd NI Motion Assistant Hp dieu khien chuyei ddng cua NI cd cdng suat cao nhiit la NI 735 Series vdi true dieu khien ehuyen dpng bdd hoac servo, I/O, va nhieu dac diem manh m khac Do cac thiet bi dieu khien ehuyen dpn dang plug-in dda tren PCI hoac PXI, ban c the tich hdp chung vdi nhieu loai module I/( ddng thdi de dang ket hdp chdng vdi phan cittn them vao de thu thap d d lieu va x d li hinh anh Oe ket ndi cac thiet bi dieu khien chuyen dpng vdi cac bd truyen ddng va ddng ed, NI eung cap cac Ida chpn ket noi cap hoac khdi dau ndi
Cac bd dieu khien ddng tiiy chinh
Trong cac bp dieu khien chuyen dpng plug-in vdi DSPs thfch hdp vdi nhieu dng dung, ban can bp dieu khien chuyen ddng chinh de di'eu khien chuyen dpng chinh xac vdi tdc dp up-date servo len tdi 200 kHz Mot sd dng dung doi hdi dp chinh xac va linh hoat cao bao gdm cac may mde xd li lat mdng nganh ban dan hay day chuyen lap rap cd kha nang tai cau hinh cho nganh d td
Cdng nghe I/O (RIO) cd kha nang tai cau hinh eda NI dddc ket hdp vdi edng nghe NI SoftMotion tao cac cdng cu phd hdp cho nha che tao may mudn dieu khien chuyen ddng tiiy chinh cd dp chinh xac cao vdi dp linh hoat cua mdt FPGA Ben canh cae dng dung cd dp chinh xac cao, cae nha che tao may va OEM ed the sif dung LabVIEW NI SoftMotion Module de thifc hien dieu khien ehuyen dpng phdi h(?p da true sif dung mdi trddng phat trien dd hpa LabVIEW tren nhieu nen tang Odi vdi cac dng dung ddi hdi he thdng ben vdng va nhd gpn, ban cd the sd dung eac bp dieu khien tdddng hda kha trinh (PAC) NI CompactRIO Bang each ket hdp API khdi chife nang cap cao eda LabVIEW NI SoftMotion va cac giao dien lap trinh truyen dpng NI C Series, ban ed the nhanh chdng phat trien cae dng dung chuyen dpng manh me va ket ndi hang tram dpng cd bddc cung nhd dpng ed servo vdi nhau.<'
M.T (Theo http://sine.ni.com)
Automationworld.com) http://sine.ni.com)