Thermocouple signals tuaj yeem hloov mus thoob plaws lub tshuab hluav taws xob hloov pauv, tab sis qhov kev sim ua tiav txuas ntxiv tsis ua pov thawj tias qhov ntsuas qhov ntsuas kub yog qhov tseeb. Qhov kev pheej hmoo tseem ceeb tsis yog tsuas yog poob ib lub xaim. Lub thermocouple tsim ib qho hluav taws xob me me, thiab cov khoom siv ntxiv hloov ntawm lub nplhaib plam tuaj yeem cuam tshuam qhov hluav taws xob thaum qhov sib txuas sib txuas ntawm qhov sib txawv. Qhov yuam kev yuav tshwm sim tsuas yog tom qab lub tshuab ua kom sov lossis ncav cuag kev khiav hauj lwm ceev.
Rau kev sib hloov ncej, lub tshuab rhaub cua sov, ntsuas spindle lossis ntsuas qhov sib dhos, cov lus nug txog engineering yog li no:Qhov twg yog qhov kev siv thermocouple tsim, dab tsi hla ntawm rotor-to-stator ciam teb, thiab yuav ua li cas ntsuas qhov ntsuas kom tiav thaum tig?Cov lus qhia no muab piv rau cov thermocouple ncaj qha kis tau tus mob nrog cov cua txias ntawm lub rotating sab, tom qab ntawd txhim kho kev txheeb xyuas cov kab hluav taws xob, kev ua yuam kev-pob nyiaj siv thiab kev npaj txais dynamic. Nws tsis yog ib qho kev lees paub tias txhua lub ntsiab lus hauv lub nplhaib yog haum rau kev ntsuas thermocouple.
Vim li cas lub thermocouple channel txawv ntawm ib qho analog channel zoo tib yam
Lub thermocouple yog tsim los ntawm ob yam khoom siv sib txawv, xws li cov khoom siv hauv hom K lossis Hom T sensor. Lub ntsuas ntsuas txhais qhov voltage cuam tshuam nrog qhov sib txawv ntawm qhov sib txawv ntawm qhov ntsuas qhov sib txuas thiab qhov sib txuas siv. Nws kuj yuav tsum suav rau qhov ntsuas kub, feem ntau los ntawm kev them nyiaj txias txias (CJC). Thermocouple tso zis yog nonlinear, yog li kev hloov pauv ntawm qhov hluav taws xob mus rau qhov kub thiab txias yuav tsum siv cov kev sib raug zoo ntawm kev sib raug zoo es tsis yog ib qho kev sib npaug ntawm txhua qhov kev ntsuas.
Lub nplhaib plam qhia cov khoom siv ntxiv ntawm qhov sib txuas ntawm lub sensor thiab cov twj tso kua mis. Cov no tuaj yeem suav nrog kev sib txuas ntawm thermocouple alloy-to-terminal, cov khoom siv sab hauv, cov khoom siv txhuam thiab cov nplhaib, cov khoom sib txuas thiab cov khoom siv tooj liab. Covtxoj cai ntawm cov hlau nruab nrabpiav qhia vim li cas ntxiv lwm cov hlau tsis tuaj yeem tsim qhov yuam kev thaum cov junctions ntxiv nyob rau tib qhov kub. Tab sis nws tsis tso cai rau kev kho qhov tsis yog-isothermal rotating los ua ke raws li hluav taws xob pob tshab rau lub thermocouple.
Yog tias ob qhov kawg ntawm qhov sib txawv-hlau hloov pauv muaj kev sib txawv ntawm cov thermal tej yam kev mob, qhov ntxiv thermoelectric voltage tuaj yeem txhais tau los ntawm kev ntsuas ntsuas raws li qhov kub thiab txias. Cov cua kub tuaj yeem los ntawm kev sib txhuam, cov kabmob, cov hluav taws xob sib txuas uas nyob ib sab, cov txheej txheem nws tus kheej los yog qhov chaw sov. Cov neeg muag khoom tshwj xeeb tshaj tawm ceev faj tiv thaiv qhov kub thiab txias gradients hla lub nplhaib-ntiv nplhaib thermocouple circuits thiab muab rotating-sab txias txias los tswj qhov kev pheej hmoo.
Qhov kev sib txawv ntawd cais txoj haujlwm no los ntawm kev dav davplam-ntiv nplhaib tiv tauj-kuj kuaj. Kev tiv thaiv kev ruaj ntseg tseem ceeb, tab sis lwm txoj hauv kev noj qab haus huv tseem tuaj yeem tsim cov thermal ntsuas offset yog tias nws cov thermoelectric junctions tsis tswj.
Kos qhov kev ntsuas tag nrho ua ntej xaiv txoj kev xaim
Daim ntawv qhia kev teeb tsa los ntawm qhov ntsuas qhov taw qhia mus rau qhov pom qhov kub thiab txias. Yam tsawg kawg nkaus, txheeb xyuas tus tswj chaw nres tsheb lossis DAQ, nyob ruaj ruaj cable thiab txiav tawm, stator terminals, kev sib txuas lus, rotor terminations, rotating cable, thiab thermocouple ntsuas qhov sib txuas. Lub mounting thiab nyob ze qhov chaw kub yuav tsum yog ib feem ntawm daim duab no. Xws li cov khoom siv cua sov, lub cev muaj zog tsav, encoder lossis cov kev sib txuas lus digital sib koom ua ke tib lub rooj sib dhos.
| Interface element | Cov ntaub ntawv rau cov ntaub ntawv | Vim li cas thiaj tseem ceeb |
|---|---|---|
| Thermocouple thiab kub hlws ris | Hom, junction style, qhov chaw, kev khiav hauj lwm ntau yam, yuav tsum tau raug | Tsim kom muaj kev ntsuas physics thiab lees paub qhov yuam kev |
| Rotating txhuas thiab kev sib txuas | Alloy / extension hom, polarity, connector cov ntaub ntawv, hloov kub | Qhia txog thawj qhov ua tau tsis xav txog kev sib tshuam |
| Rotary hluav taws xob txoj kev | Dedicated channel khub, hu rau kev tsim kho, nyob ze zog txoj kev, tsab ntawv tsa suab | Txheeb xyuas cov neeg kho tshuab thiab thermal cuam tshuam ntawm qhov hluav taws xob qis |
| Kev txiav txim tsis tu ncua | Cov khoom siv hlau, lub davhlau ya nyob twg thaiv, connector kub, thaiv txoj kev | Txiav txim siab dab tsi ntxiv junctions ua ntej lub ntsuas ntsuas |
| DAQ thiab siv | Thermocouple hom teeb tsa, CJC qhov chaw, input impedance, nrhiav tau | Txiav txim siab seb qhov ntsuas kub qhov twg qhov ntsuas tau them |
| Lwm cov kev pabcuam rotary | Cua sov lub zog, lub cev muaj zog, thaj chaw, kev sib txuas lus, kev tshem tawm txhua yam | Qhia txog kev cuam tshuam thiab cua sov uas cuam tshuam rau lub sensor |
Tsis txhob txuas lub thermocouple rov qab mus rau lub zog yooj yim rov qab los tsuas yog txuag lub channel. Thermocouples yog ib txwm ntsuas raws li ib qho kev sib txawv ntawm tus khub nyob rau hauv lub tswv yim module cov kev cai hauv av thiab kev cais tawm. Qhov kev npaj tiag tiag nyob ntawm qhov sib txuas ntawm lub sensor (hauv av, tsis muaj av lossis nthuav tawm), DAQ hom kev muaj peev xwm thiab cov phiaj xwm hauv av. Kev tiv thaiv lub ntiaj teb, cable shield thiab thermocouple tsis zoo cov hlau lead tsis sib npaug vim tias lawv koom nrog lub tshuab kaw.
Kev xa ncaj qha lossis txias ntawm lub rotor?
Muaj ob lub ntsiab architectures. Nyob rau hauv thawj zaug, raw thermocouple conductors xaus ntawm lub rotating interface; qhov me me sensor voltage ces taug kev hla lub nplhaib ntiv nplhaib mus rau qhov chaw nres tsheb thermocouple ntsuas hluav taws xob. Hauv qhov thib ob, cov khoom siv hluav taws xob tau teeb tsa rau ntawm qhov kev hloov pauv ntsuas lub thermocouple hauv zos, tsim lawv tus kheej qhov ntsuas kub thiab xa cov teeb liab hluav taws xob los ntawm kev sib tshuam.
| Kev tsim vaj tsev | Qhov zoo | Cov xwm txheej tseem ceeb | Qhov kev ntsuam xyuas zoo tshaj plaws |
|---|---|---|---|
| Raw thermocouple voltage hla lub nplhaib ntiv nplhaib | Yooj yim sensor-sab kho vajtse; tsis muaj rotating amplifier mov yuav tsum tau | Cov khoom siv sib txuas, thermal gradients, microvolt-theem suab nrov, CJC kev xav thiab kev sib cais channel | Puas tuaj yeem ua tiav qhov kev teeb tsa hluav taws xob ua tau raws li nws qhov ntsuas kub-yuam kev txwv ntawm kev khiav hauj lwm ceev thiab kub? |
| Rotating-sab thermocouple txias txias | Ntsuas tsis muaj zog sensor voltage ua ntej kev sib cuag; tuaj yeem them cov nqi siv hauv zos thiab nce qib teeb liab | Rotating electronics mov, thermal rating, reference raug, tso zis hom, EMI thiab dynamic verification | Lub tshuab txias thiab nws cov khoom xa tawm tuaj yeem ua tau raws li qhov tseeb pob nyiaj siv hauv txhua lub xeev kev khiav haujlwm? |
Rotating-side conditioning tsis tau zoo dua nyob rau hauv txhua qhov ntev. Nws ntxiv cov khoom siv kho vajtse, hluav taws xob thaiv hluav taws xob thiab kev tswj xyuas thermal. Cov zis yuav yog qhov loj dua analog voltage, 4-20 mA voj lossis cov ntaub ntawv digital, nyob ntawm qhov txias; txhua tus nyias muaj nyias qhov yuav tsum tau ua. Ib qho kev tsim tsis tuaj yeem hu ua tsim nyog vim nws muaj tib tus naj npawb ntawm cov conductors. Piv txwv li, hloov mus rau 4-20 mA yuav tsum muaj cov khoom siv tau siv tau thiab cov nyiaj siv hluav taws xob ntau dua li kev kho ob-hlau thermocouple ua lub voj voog tam sim no.
Michigan Cov ntaub ntawv tshawb fawb ob qho tib si ncaj qha thermocouple kev sib txuas thiab kev sib txuas ua ke thermocouple amplifiers. Nwskev piav qhia ntawm thermocouple amplifiershais txog kev them nyiaj txias-kuj thiab cov teeb liab-rau-suab nrov txwv. Cov no yog cov piv txwv ntawm kev tsim kho engineering, tsis tau txheeb xyuas cov ntaub ntawv ua tau zoo rau ib qho qauv ByTune.
Nkag siab qhov twg qhov kub thiab txias koj CJC kho tau
Qhov kev ua yuam kev hauv nruab nrab yog xav tias ib qho chaw ruaj ntseg DAQ CJC sensor tau them nyiaj rau txhua qhov kev sib tshuam ntawm qhov ntsuas kub nyob qhov twg raws li qhov sib txuas. CJC sensor feem ntau sawv cev rau qhov ntsuas kub ntawm lossis ze ntawm DAQ's thermocouple input terminals. Nws tsis tuaj yeem paub qhov kub thiab txias ntawm cov chaw taws teeb rotor terminals, stator terminals lossis kev hloov pauv sab hauv tshwj tsis yog muab kev ntsuas ntxiv thiab qauv.
Xav txog yam khoom nyoos hom K sensor txuas rau lub nruas rotating. Nws qhov zoo thiab qhov tsis zoo alloys raug txiav mus rau qhov tsis yog-thermocouple conductors ntawm lub rotating connector. Lub teeb liab ces hla dhau lub nplhaib plam thiab tawm ntawm qhov chaw nres tsheb nres. Yog hais tias lub rotating termination thiab kev hloov nyob ruaj ruaj nyob twj ywm zoo isothermal nyob rau hauv cov kev sib txuas ua ke, ntxiv junction contributions tuaj yeem tshem tawm raws li txoj cai nruab nrab-hlau. Yog hais tias lub rooj sib txoos teb tsim qhov kub thiab txias, qhov kev tshem tawm yuav tsis tuav lawm. Ib qho EMF me me uas hloov nrog ceev lossis sov tuaj yeem hloov qhov pom tseeb ntawm qhov kub thiab txias txawm tias qhov kev sib tshuam ntawm qhov kev hnov mob tiag tiag nyob twj ywm.
Qhov teeb meem tsis daws tau los ntawm kev txav DAQ kom deb ntawm tshav kub thaum ua kom cov chaw taws teeb hloov pauv tsis tau saib xyuas. Ib txoj hauv kev zoo dua yog txhawm rau txheeb xyuas qhov twg txhua yam khoom hloov pauv, seb qhov kev hloov pauv ntawm qhov sib txawv yog qhov kub thiab txias thiab seb lub kaw lus CJC tus qauv puas sib phim qhov kev npaj. OMEGA covntsuas kub- ntsuas cov txheej txheempiav qhia vim li cas qhov kev siv thiab nruab nrab-hlau tej yam kev mob tseem ceeb. Qhov cuam tshuam calibration yuav tsum encompass txoj kev teb, tsis yog lub ntsiab sensor.
Thaum siv cov thermocouple txias hauv zos, lub tshuab txias yuav tsum ntsuas cov thermocouple ntawm qhov taw qhia tig nrog CJC haum. Nws cov zis yog ces ib qho teeb liab sib txawv nrog cov kev ua yuam kev sib txawv. Qhov no yog kev hloov ntawm kev ntsuas architecture-tsis yog kev tshem tawm ntawm txhua qhov yuam kev.
Kev txiav txim txuas thiab txiav tawm uas tuaj yeem khaws lossis ua kom raug
Pib los ntawm kev kho cov thermocouple hom thiab siv tus neeg xyuas pib / txuas ntxiv lossis them nyiaj xaim qhov xav tau. Polarity, connector hom, tso cai extension kub thiab txiav cov ntaub ntawv yuav tsum tau xyuas raws li ib feem ntawm ib tug Circuit Court. Lub rooj sib tham xim ib leeg tsis txaus vim tias cov qauv xim thermocouple sib txawv. Nrog rau qhov tseeb cable thiab connector txheeb xyuas thiab xaiv qhov ntsuas module configuration.
| Kev txiav txim siab | Pom zoo xyuas engineering | Ua tsis tiav yog tsis quav ntsej |
|---|---|---|
| Ua haujlwm ua khub | Tuav ib txoj hauv kev zoo thiab tsis zoo rau ib lub thermocouple; tsis txhob ua ntsiag to qhia rov qab | Hla-hais lus, kev npaj txhij txog hom kev sib txuas lossis kev sib txuas tsis raug |
| Thermocouple-rau-terminal hloov pauv | Sau cov alloy thiab mating khoom ntawm txhua sab thiab ntsuas kub gradients | Offset lossis drift tsis ntes los ntawm chaw nres tsheb CJC |
| Extension/compensating lead | Ua raws li hom thiab qhov kub thiab txias; khaws cia polarity kawg kom kawg | Ntxiv qhov kub thiab txias-nyob ntawm EMF |
| Shield thiab grounding | Siv cov kev xaiv nkag module cov lus qhia hauv av / cais tawm thiab cov ntaub ntawv pov thawj cov txheej txheem | Pem hauv ntej-loop pickup los yog tsis txaus suab nrov rejection |
| Qhov sib thooj rau cov cua sov / tsav tsheb | Khaws cov kab hluav taws xob qis qis sib cais qhov twg ua tau; sim tiag hloov lub xeev | PWM-correlated suab nrov yuam kev rau qhov kub thiab txias variation |
| Cable lim thiab tiv thaiv kev sib hloov | Tswj txhua yam txav ntawm rotor thiab stator tawm | Intermittent faults thiab lub kaum sab xis nyeem ntawv |
Ua ntej pib qhov ntsuas kub, txheeb xyuas txhua lub voj voog daim ntawv qhia thiab polarity. Ua tib zoo paub qhov txawv ntawm txhua yam cable txuas ntxiv los ntawm kev ua haujlwm hluav taws xob. Lub ntsuas hluav taws xob txuas ntxiv tuaj yeem ntes qhov qhib kev sib txuas, tab sis nws tsis tuaj yeem tsim kom muaj qhov tsawg microvolt offset lossis kev ruaj ntseg hauv kev sib hloov. Hloov pauv, hloov lub thermocouple vim qhov kev nyeem ntawv hloov pauv tuaj yeem nkim sijhawm yog tias qhov ua yuam kev yog tsim los ntawm kev sib txuas ntawm stator kub lossis txoj kev tsav-suab nrov ntawm lwm qhov hauv lub rooj sib txoos.
Yog hais tias lub nplhaib plam yuav tsum muab cov cim qhia thermocouple nrog cov cua sov lossis lub cev muaj zog, qhia lawv cov channel thiab tso cai sib txuas sib cais. Saib ByTune qhov dav duahluav taws xob kev kuaj mob cov lus qhiarau qhov sib txawv ntawm kev sib cuag tsis ruaj khov, EMI, crosstalk thiab grounding. Kab lus no lub luag haujlwm yog nqaim dua: seb cov teebmeem no hloov pauv qhov ntsuas kub ntawm qhov ntsuas kub.
Txhais cov kev cuam tshuam microvolt rau hauv cov peev nyiaj kub-yuam kev
Kev siv nyiaj yuam kev tiv thaiv tus neeg muag khoom tshwj xeeb los ntawm kev sib tsoo rau hauv qhov kev thov tsis meej rau "tso suab nrov thermocouple plam nplhaib." Pib nrog qhov kev tso cai yuam kev ntawm kev ntsuas ua tiav, suav nrog lub sensor nws tus kheej, siv kev sib txuas, cov khoom siv hluav taws xob, kev teeb tsa thiab kev sib kis. Txiav txim siab seb qhov kev lees txais yog raws li qhov ua yuam kev tiag, qhov yuam kev ntxiv tshwm sim los ntawm kev ntxiv lub nplhaib plam, rov ua dua, kev cuam tshuam ib ntus lossis kev sib xyaw ua ke.
Raws li ib tughauv zos illustrative xam xwb, xav tias lub thermocouple muaj qhov rhiab heev nyob ze ntawm qhov chaw ua haujlwm ntawm kwv yees li 40 microvolts ib℃Celsius. Yog hais tias qhov ntxiv rotary txoj kev tsim 80 microvolts ntawm qhov sib npaug offset, qhov cuam tshuam hauv cheeb tsam kub yog li 80 / 40 =2 degree. Qhov no yog ib qho piv txwv rhiab heev, tsis yog tas li uas siv rau txhua hom thermocouple lossis kub. Qhov tseeb voltage-rau-kub hloov dua siab tshiab yuav tsum siv qhov tseeb siv zog, xws li covNIST ITS-90 cov rooj thermocouple.
Tam sim no xav tias daim ntawv tso cai tsis pub ntau tshaj 1℃ntawmntxivrotating-interface yuam kev. Ib qho system uas qhia txog 2℃ntxiv offset ua tsis tau qhov kev xav tau tshwj xeeb txawm tias nws qhov kev sib txuas zoo li qub thiab qhov nruab nrab tiv thaiv kev tiv thaiv dhau. Txoj kev kho yuav yog qhov sib txawv ntawm qhov kub thiab txias, qhov sib txawv ntawm qhov kev tso tawm, ib qho kev ntsuas zoo dua lub nplhaib, rotating-side conditioning los yog redesign ntawm lub sensor architecture. Qhov 1℃txwv ntawm no yog hypothetical; OEM yuav tsum txhais nws tus kheej kev lees txais.
| Tus pab nyiaj txiag | Yuav ntsuas nws li cas | Yuav tsum ntsuas? |
|---|---|---|
| Thermocouple element thiab calibration | Hom, qib, traceable calibration thiab ntsia ntsuas ntau yam | Siv cov pov thawj kam rau ua thiab calibration |
| DAQ daws teeb meem, suab nrov thiab linearization | Module datasheet ntxiv rau qhov tsim hluav taws xob simulation | Yog, rau qhov project txais |
| CJC thiab termination gradients | Kev siv cov khoom siv tiag tiag thiab cov chaw taws teeb sib txuas | Yog, tshwj xeeb tshaj yog thaum sov so |
| Rotary-interface thermal EMF | Lub hauv paus sib txawv nrog thiab tsis muaj kev sib hloov thiab thermal gradient | Yog, nrog tus sawv cev mounting |
| Tiv tauj nrog kev sib tshuam thiab tuaj tos | Lub sij hawm-synchronized kub/voltage taug qab | Yog, ntawm qhov yuav tsum tau txais bandwidth |
| Installation thiab sensor tso | Thermal contact, teb lub sij hawm thiab lub zos kub gradients | Txheeb xyuas cov haujlwm ntsuas lub cev |
Qee qhov kev tsis paub tseeb tuaj yeem sib xyaw ua ke thaum muaj kev ywj pheej thiab kev faib tawm raug cai; lwm tus raug bounded li cov neeg phem tshaj. Tsis txhob cia li ntxiv txhua tus lej hauv quadrature lossis rho tawm ib txoj kev pom zoo los ntawm lwm qhov yam tsis muaj tus qauv tsis paub meej. Daim ntawv xeem yuav tsum sib caissystem kub yuam kevlos ntawmyuam kev ntxiv los ntawm lub teb interface, txij li thaum lawv txhawb kev lees paub sib txawv.
Sib cais sensor, siv thiab plam-ntiv nplhaib yuam kev ua ntej kev sib hloov
Ib lub rooj ntev zaum muaj txiaj ntsig tsim kom muaj kev tswj xyuas kev siv ntau dua li tsis caum lub suab nrov ntawm lub tshuab nyeem. Ua ntej, txheeb xyuas DAQ nrog qhov tsim nyog thermocouple simulator lossis qhov hluav taws xob tau teeb tsa rau nws cov tswv yim thiab CJC txoj kev. Tom qab ntawd xyuas qhov tseeb thermocouple nyob rau hauv qhov tsim nyog ntsuas kub siv. Thaum kawg, ntxiv txoj kev npaj teb thaum khaws tib yam kev paub. Sau cov kab kos thiab txuas hloov pauv ntawm txhua kauj ruam.
Peb qhov kev sib piv yog cov ntaub ntawv tshwj xeeb.Tsis muaj nplhaib nplhaib:lub sensor thiab acquisition system muab cov ntaub ntawv siv.Nrog swb nplhaib nyob ruaj ruaj:txoj kev suav nrog tag nrho cov kev sib txuas ntxiv tab sis tsis muaj kev sib cuag.Nrog swb nplhaib rotating:qhov sib txawv suav nrog kev coj tus cwj pwm dynamic hu, ceev-nyob ntawm cua sov thiab kev txav-coupled cuam tshuam. Ib qho mob thib plaub tom qab thermal stabilization yog qhov tseem ceeb uas cov kabmob, lub zog hluav taws xob lossis cov txheej txheem ua kom sov lub rooj sib txoos.
Ib qho yooj yim ntsuas kab yuav tsum tsis txhob hloov lub sensor tiag tiag yog tias cov kab hla dhau ntawm cov thermocouple cov khoom hloov pauv. Piv txwv li, txhaj tshuaj millivolt teeb liab ncaj qha rau ntawm qhov kawg ntawm qhov chaw nres tsheb tuaj yeem tshawb xyuas DAQ, tab sis nws tsis ntsuas qhov kev hloov pauv ntawm cov thermocouple. Siv txhua qhov simulation ntawm tus ciam teb nws ua tau sawv cev. Qhia meej meej qhov twg lub tshuab hluav taws xob simulator txuas nrog, vim tias "calibration dhau" tsis pom tseeb.
Dynamic validation: ua kom ceev, cua sov thiab hloov cov sib txawv
Qhov kev lees paub zaum kawg yuav tsum rov tsim dua lub hnab ntawv kho tshuab, rotor / stator cable txhawb nqa, lub zog nyob ib sab thiab kev ua haujlwm kub. Teem lub thermocouple hlws ris ntawm qhov chaw ruaj khov, ntsuas tus kheej ntawm tus kheej siv qhov twg los tau ua kom cov kev hloov pauv tuaj yeem raug ntaus nqi rau cov saw hlau ntsuas. Yog tias qhov kev sib hloov ruaj khov tiag tiag tsis tuaj yeem siv tau, siv cov kev ua haujlwm zoo thiab sau nws cov kev txwv.
| Test lub xeev | Kev sib hloov / cua sov / lub zog | Kev soj ntsuam thawj zaug | Txhais lus |
|---|---|---|---|
| A. Direct hauv paus | Sensor thiab DAQ tsis muaj txoj kev tig | Reference raug thiab input suab nrov | Separates intrinsic instrumentation txwv |
| B. Nruab zoo li qub | Slip nplhaib txuas, nres, thermally ruaj khov | Offset txheeb ze rau A | Qhia ntxiv cov kev sib txuas thiab kho qhov yuam kev |
| C. Tsawg-ceev dynamic | Cov neeg sawv cev xaim, kev sib hloov qeeb, lwm yam hluav taws xob tawm | Angle-correlated spikes los yog cyclic variation | Qhia txog kev sib cuag lossis cov neeg kho tshuab rhiab heev |
| D. Kev ua haujlwm li qub | Nominal ceev thiab thim rov qab raws li xav tau | Kev tsis ncaj ncees tsis tu ncua, suab nrov thiab cov xwm txheej tsis tu ncua | Tsim kom muaj kev pabcuam tiag tiag-lub xeev kev ua haujlwm |
| E. Thermally stabilized | Tib tsab ntawv tsa suab tom qab ua kom sov / txheej txheem cua sov | Hloov nyob rau hauv offset piv rau lub davhlau ya nyob twg kub | Kev ntsuam xyuas cov thermoelectric-gradient rhiab heev |
| F. Kev cuam tshuam lub xeev | Motion plus heaters/motor drive switching | Lub suab sib cuam tshuam nrog kev hloov | Sib cais EMI teebmeem los ntawm qeeb thermal drift |
| G. Cov xwm txheej phem tshaj plaws | Pom zoo ceev, thermal load thiab installation | Qhov kev ua yuam kev siab tshaj plaws, kev tso tawm thiab rov qab los | Qhov kawg ntawm qhov project tshwj xeeb txais |
Rau txhua lub xeev, teev cov ncej ceev thiab lub kaum sab xis uas muaj, rotor / stator txiav qhov kub thiab txias yog siv tau, siv qhov ntsuas kub tiag tiag, cov khoom siv hluav taws xob tsis zoo lossis cov ntaub ntawv ntsuas sib npaug, hloov pauv kub, DAQ lim chaw, lub zog nyob ib sab, thiab lub sijhawm dhau mus. Yog tias kev yuav khoom siv lim, ntes cov kab nrawm nrawm kom nthuav tawm cov kev cuam tshuam luv luv uas qhov nruab nrab cov duab yuav zais. Tus qauv tsim nyog tus nqi thiab bandwidth nyob ntawm seb lub tshuab ua haujlwm thiab kev tswj lossis cov ntaub ntawv-logging lub hom phiaj; tus lej universal yuav yuam kev.
Tsis txhob ntsuas qhov ntsuas kub los ntawm ib qho nominal RPM lossis ib chav tsev kub ntawm lub rooj ntev zaum khiav. Lub hom phiaj yog los qhia tias qhov ntsuas tseem nyob hauvua kom tiav qhov kev tso cai yuam kev txwvnyob rau hauv qhov tseeb tej yam kev mob uas lub rotating ib feem yog siv. Ib qho kev sim ntawm qhov nrawm dua tab sis tsis muaj cov txheej txheem cua sov tuaj yeem yog tus neeg sawv cev tsawg dua qhov qis-ceev, tag nrho cov cua sov khiav.
Ntsuam xyuas cov duab ntawm qhov yuam kev, tsis yog cov tsos mob xwb
| Pom tus cwj pwm kub | Ua tau | Qhov tseem ceeb tshaj qhov sib piv tom ntej |
|---|---|---|
| Offset hlob qeeb tom qab pib | Kev siv-kev sib txuas gradient, bearing / tiv tauj cua sov, DAQ drift | Rov ua dua ntawm qhov ntsuas kub thiab ntsuas qhov ntsuas qhov ntsuas kub |
| Luv spikes rov qab ntawm tib lub kaum sab xis | Sib cuag variation, connector txav, mechanical runout | Sau cov teeb liab nyoos thiab lub kaum sab xis ua ke ntawm qeeb / ib txwm ceev |
| Lub suab nrov tshwm tsuas yog thaum lub tshuab hluav taws xob lossis VFD hloov pauv | Ua / radiated EMI los yog sib koom siv txoj kev | Tuav cov lus tsa suab tas li; piv load switching off/on |
| Qhov kub tsis zoo txawm tias nyob ruaj ruaj | Hom thermocouple tsis raug, thim rov qab polarity, tsis ncaj ncees lawm txuas txuas ntxiv lossis CJC teeb tsa | Tshawb xyuas simulator, cov ntaub ntawv txiav tawm thiab DAQ nqis |
| Tsuas yog ib qho ntawm ob peb channel drifts | Channel tshwj xeeb txiav tawm lossis thermal txoj kev | Sib piv cov kab sib txuas sib txuas qhov kub thiab txias |
| Tag nrho cov channel hloov ua ke thaum sov so | Common siv kub los yog hluav taws xob cua sov | Sib piv DAQ / CJC nyeem ntawv thiab cov ntsiab lus siv lub cev |
Cov laj thawj uas tau teev tseg yog qhov kev xav, tsis yog ib qho kev kuaj mob ib leeg. Lub kaum sab xis-correlated spike kuj tuaj yeem tshwm sim los ntawm cov hlua khi ntawm txoj haujlwm rov ua dua. Kev qeeb qeeb tuaj yeem tshwm sim los ntawm cov txheej txheem kub hloov pauv yog tias qhov kev siv tsis raug tswj xyuas. Txoj kev daws teeb meem ua haujlwm tsuas yog thaum paub txog qhov ntsuas kub thiab ntsuas ntsuas.
Thaum twg koj yuav tsum tso tseg cov thermocouple raw khoom?
Xaiv cov kis tau tus mob tsuas yog tom qab tus tsim qauv qhia tau hais tias txoj kev teeb tsa tiav raws li nws qhov kev tso cai ntxiv yuam kev thiab rov ua dua. Nws tuaj yeem yog qhov kev daws teeb meem zoo qhov twg lub nplhaib ntiv nplhaib yog thermally uniformly, tsis tshua muaj suab nrov hluav taws xob tswj thiab ntsuas lub luag haujlwm yog sib xws nrog cov cuab yeej xaiv. Tab sis yog tias qhov me me, qhov ntsuas kub ntawm qhov ntsuas kub ntawm qhov ntsuas kub ua rau qhov kev tsis txaus ntseeg tsis txaus ntseeg, rov ua qhov kev kuaj xyuas txuas ntxiv tsis zoo li yuav kho qhov teeb meem hauv paus.
Lub rotating-sab txias txias yog tus neeg sib tw muaj zog thaum lub installation muaj ntau yam thiab hloov rotor-rau-stator kub sib txawv, thaum lub teeb liab raw cov ntaub ntawv yog rhiab heev rau hluav taws xob cuam tshuam, los yog thaum ob peb qhov kub thiab txias channel yuav tsum sib koom ib tug xav tau kev sib sau ua ke. Nws tseem xav tau lub zog siv tau, qhov tseeb ntawm CJC hauv zos, kev sib cais ntawm cov sensor, ib puag ncig muaj peev xwm, tso zis raws tu qauv thiab kev pabcuam. Yog tias lub tshuab txias tso tawm cov ntaub ntawv digital, siv tau cov txheej txheem digital lub cev tiag tiag; Yog hais tias nws outputs analog voltage los yog tam sim no, validate qhov interface lub suab nrov thiab load txwv xwb.
Lwm qhov kev xaiv yog hloov lub tshuab sensor lossis tso cov khoom siv hluav taws xob sib txawv. Ib qho RTD tuaj yeem muab qhov sib txawv ntawm qhov tseeb thiab ruaj khov kev lag luam tawm tab sis yuav tsum muaj kev zoo siab thiab kev tswj xyuas cov hlau lead. Ib lub tshuab xa hluav taws xob kub uas nyob ntawm qhov hloov pauv tuaj yeem ua kom yooj yim rau qhov tsis muaj zog-cim ciam thaum ntxiv cov khoom siv hluav taws xob thiab lub zog. Cov no yog cov kev xaiv tsim qauv, tsis yog hloov pauv tsis siv neeg rau qhov pom zoo thermocouple.
Rau lub hom phiaj tsim los ua ke, siv lubByTune kev cai swb-ntiv nplhaib nug txoj kevkom qhia meej tag nrho cov interface es tsis thov ib qho "thermocouple-npaj" ib feem. Ib qhov project yuav xav tau ib txoj hauv kev siv cuab yeej cuab tam, tshwj xeeb tsim kev txiav tawm, kev sib cais ntawm cov cua sov lossis cov teeb liab-txias; seb puas muaj kev teeb tsa yuav tsum tau lees paub los ntawm cov chaw tsim khoom tiv thaiv cov duab kos tiag tiag thiab cov phiaj xwm sim.
Xa tus neeg xa khoom mus rau qhov ntsuas kev ntsuas, tsis yog ntsuas hluav taws xob nkaus xwb
| RFQ teb | Dab tsi pab pawg engineering yuav tsum muab |
|---|---|
| Lub hom phiaj ntsuas kub | Kub-hluav taws xob qhov chaw, sensor hom thiab chav kawm ntawv, ntau yam, yuav tsum tau raug thiab ib ntus teb |
| Reference architecture | Raw TC los ntawm kev sib cuag lossis cov teeb liab txias los ntawm sab tig; qhov tseeb CJC |
| Channel daim ntawv qhia | Dedicated TC zoo / tsis zoo circuits, lwm yam teeb liab / cov ntaub ntawv circuits, hwj chim circuits thiab tiv thaiv / chassis paths |
| Thermocouple thaiv kab | Conductor/extension type, connector and transition material, shielding, cais thiab polarity |
| Mechanical hnab ntawv | Ncej, bore, OD, ntev, mounting, cable tawm thiab tiv thaiv kev sib hloov |
| Kev ua haujlwm profile | Kev nrawm, lub luag haujlwm, thim rov qab, kev vibration, ib puag ncig, kev pib thiab thermal ruaj khov-lub xeev tej yam kev mob |
| Thermal influences | Cov txheej txheem cua sov, cua sov tam sim no, xav tau rotor / stator davhlau ya nyob twg kub, airflow thiab sov lub sij hawm |
| DAQ / cua txias | Input configuration, CJC, excitation / hwj chim yog hais tias tsim nyog, tso zis hom, lim thiab nrhiav tau bandwidth |
| Kev npaj txais | Siv cov txheej txheem kub, tso cai ntxiv offset thiab drift, dynamic spikes, ua haujlwm tsis zoo |
| Cov pov thawj thov | Daim duab kos duab tshwj xeeb, daim ntawv qhia kab hluav taws xob, cov ntaub ntawv siv tau thiab pom zoo hloov cov ntaub ntawv siv tau |
Tsis txhob hloov cov lus tshaj tawm "tsawg suab," lub neej lossis RPM siab tshaj plaws rau kev ntsuas-kev ua tau zoo. Cov lus teb cuam tshuam yog seb qhov kev sib koom ua ke puas tuaj yeem ua tau raws li qhov ntsuas qhov yuam kev ntawm pob nyiaj siv los ntawm cov khoom siv hluav taws xob, thermal thiab hluav taws xob. Ib yam li ntawd, tsev neeg-theem thov hais tias ib qho kev sib dhos xa cov cim thermocouple tsis yog los ntawm nws tus kheej tsim kev sib raug zoo lossis qhov tseeb rau tus qauv.
Tshaj tawm cov qauv: ua pov thawj qhov kub thiab txias, tsis yog kev sib txuas nkaus xwb
Pom zoo rau txoj kev hloov pauv thermocouple thaum nws cov ntaub ntawv sib txuas thiab cov ntaub ntawv siv tau raug sau tseg, nws qhov kev teeb tsa thiab cov xov hlau sib phim qhov kev sim ntsuas, thiab nwsntxiv offset, drift, suab nrov thiab ib ntus yuam kevnyob twj ywm nyob rau hauv daim ntawv thov txwv thaum lub sij hawm sawv cev sib hloov, cua sov thiab hluav taws xob hloov. Sau seb qhov txwv tsis pub siv rau tag nrho cov kev hnov lus lossis tsuas yog rau kev koom tes los ntawm lub nplhaib plam.
Yog tias qhov kev ntsuam xyuas tsuas yog tsim kom ntseeg tau tias cov rings yog conductive, qhov ntsuas kub tseem tsis tau tsim nyog. Yog hais tias cov teeb liab nyoos tsis tau tab sis qhov tseeb rotating-sab txias txias dhau, qhov kev hloov pauv ntawm architecture yog pov thawj-raws li kev kwv yees. Qhov ntawd yog qhov sib txawv ntawm lub nplhaib plam uas tuaj yeem dhau ob lub xov hlau thiab lub tshuab ntsuas qhov ntsuas kub uas tuaj yeem ntseeg tau.