Dab tsi yogPlatinum Resistance Temperature Detectors?
Saib, yog tias koj nyeem qhov no, tej zaum koj twb paub qhov kub thiab txias ntawm cov roj teeb. Tab sis ntawm no yog qhov uas tib neeg feem ntau tsis qhia rau koj: qhov kub thiab txias yog qhov nyuaj tshaj qhov nws suab, thiab qhov ua tsis yog yuav raug nqi rau koj. Ntau heev.
Peb kawm qhov no nyuaj rov qab rau xyoo 2019. Ib qho ntawm peb cov neeg siv khoom thauj khoom thauj khoom nyob rau sab qaum teb Suav tau muaj 40+ units khiav peb cov roj teeb. Lub caij ntuj no tsoo, temps poob mus rau -25 degree, thiab mam li nco dheev peb tau hu thaum 2 teev sawv ntxov. Cov tsheb yuav tsis them. BMS pheej cuam tshuam tshaj -tej ceeb toom. Hauv rho tawm nees nkaum tsib. Yog lawm.
Tig tawm NTC thermistors peb tau siv drifted yuav luag 8℃hauv huab cua txias. BMS xav tias cov hlwb tau kub dhau thaum lawv tau khov lawm. Chargers kaw lawm. Tag nrho cov nkoj tuag hauv lub tsev khaws khoom. Kev nplua, tus nqi hloov pauv, kev ya mus thov txim ntawm tus neeg... cia li hais tias ib tus neeg ntawm peb lub tuam txhab tseem muaj daim ntawv cog lus ntawd nyob rau ntawm lawv phab ntsa ua ib qho kev ceeb toom. Tus nqi peb tshaj 2 lab RMB.
Qhov ntawd yog thaum peb tus thawj coj tau muab nws txhais tes rau ntawm lub rooj thiab hais tias "txij no mus, platinum RTD ntawm txhua yam, thiab yog tias leej twg hais kom NTC rov txuag nyiaj, nws tawm ntawm lawv cov nyiaj tau los."
Yog li ntawd. Yog vim li cas peb thiaj sau qhov no. Tsis yog vim platinum RTDs zoo nkauj. Vim tias peb tau raug hlawv (ironically, los ntawm qhov ntsuas kub tsis zoo) thiab peb tsis ua qhov ntawd ntxiv.
Lub hauv paus (tab sis siv tau tiag tiag)
Platinum RTD sawv cev rau Platinum Resistance Temperature Detector. Lub hauv paus ntsiab lus yog qhov yooj yim tuag: platinum hlau tau tiv taus hluav taws xob ntau dua thaum nws kub. Ntsuas qhov tsis kam, koj paub qhov kub thiab txias. Qhov ntawd yog nws.
Cov txheej txheem kev lag luam hu ua Pt100, uas tsuas yog txhais tau tias 100 ohms ntawm 0 degree. Kuj tseem muaj Pt1000 (1000 ohms ntawm 0 degree) uas ua rau koj muaj lub teeb liab loj dua los ua haujlwm nrog, ua ke thaum koj tau txais cov xaim ntev ntev lossis qhov chaw nrov nrov. Peb siv Pt1000 ntawm txhua yam nrog cables ntev dua 2 meters tam sim no vim tias peb tau nkees ntawm chasing down 0.5℃yuam kev uas ua rau cov hlau lead tsis kam peb tsis nco qab them rau.
Vim li cas platinum tshwj xeeb? Peb yeej sim nickel thiab tooj liab thaum ntxov. pheej yig dua, paub meej. Tab sis npib tsib xee mus vwm saum 300℃thiab tooj liab oxidizes yog tias koj saib nws tsis raug. Platinum xwb... ua haujlwm . -200℃rau +850 degree, tsis corrode, tsis drift. tho txawv thiab txhim khu kev qha, uas yog raws nraim qhov koj xav tau thaum koj lub pob roj teeb zaum hauv 3-tuj forklift txav pallets ncig lub tsev khaws khoom.
Ib tug ntawm peb cov engineers nyiam hais tias "platinum kim vim nws tub nkeeg" - nws tsis hnov qab dab tsi, tsis hloov siab, tsuas yog zaum ntawm qhov tseeb. Peb yuav tub nkeeg.
Peb txoj hauv kev los tsim lawv (Thiab qhov twg ua tau tiag tiag)
Muaj hlau-mob, coiled element, thiab nyias zaj duab xis. Nov yog qhov peb xav txog txhua tus:
Hlau- qhov txhab
Txoj kev qub tsev kawm ntawv. Platinum hlau qhwv nyob ib ncig ntawm ib tug ceramic core. Super raug, super ruaj khov. Tsis tas li super kim thiab hom tsis yooj yim. Peb siv cov no rau calibration reference thiab hais txog nws. Muaj ib tus neeg siv khoom uas tau hais xov hlau- raug mob rau nws lub nkoj tag nrho vim "tsuas yog qhov zoo tshaj plaws." Rau lub hlis tom qab, ib nrab ntawm lawv tau drifted vim qhov kev co los ntawm nws lub tsev khaws khoom ntxhib hauv pem teb loosened lub windings. Tam sim no nws siv coiled ntsiab zoo li txhua leej txhua tus.
Nyias zaj duab xis
Pheej yig, me me, teb sai. Zoo heev rau cov neeg siv khoom lossis tsawg - saib xyuas cov ceg txheem ntseeg. Peb siv lawv ntawm peb cov pob me me 12V / 24V qhov twg yog ib yam dab tsi mus, tsis muaj leej twg raug mob thiab tsis muaj dab tsi ntes hluav taws. Peb puas muab lawv tso rau hauv 600V forklift pob? Tsis yog kiag li. Ceramic substrate thiab platinum zaj duab xis nthuav dav ntawm tus nqi sib txawv, thiab tom qab ob peb txhiab lub voj voog thermal koj pib pom drift. Ib hom khoom lag luam uas peb tau sim - kim ib yam nkaus - drifted 1.5℃hauv qis dua ib xyoos. Tus neeg muag khoom liam peb qhov kev teeb tsa. Peb liam lawv QC. Txawm li cas los xij, peb tsis siv lawv rau txhua yam tseem ceeb.
Coiled element
Nov yog qhov peb spec rau siab -voltage packs. Cov platinum coils zaum xoob hauv cov raj ceramic ntim nrog cov hmoov, yog li lawv tuaj yeem nthuav thiab cog lus yam tsis muaj kev ntxhov siab rau cov hlau. Lawv tswj kev vibration, lawv tswj thermal cycling, lawv tsis yws. Tus nqi kim dua li nyias zaj duab xis tab sis peb pw zoo dua hmo ntuj. Txhua lub lithium roj teeb pob khoom lag luam ua cov ntawv thov kev lag luam yuav tsum saib xyuas cov no.
2-Hloov, 3-Hom, 4-Hom: Kev Sib Tham Uas Yuav luag Muab Peb Pab Pawg
Qhov no ua rau muaj kev sib cav tiag tiag hauv peb lub hoobkas. Peb cov khoom siv lead ua xav tau 4-hlau ntawm txhua yam. Peb tus kws tshaj lij tus nqi yuav luag muaj mob stroke suav nrog cov pins txuas ntxiv thiab cov nqi cable. Lawv tsis tham ib leeg li ib lub lim tiam.
Nov yog qhov deal:
2-hlauzoo yog tias koj lub cable luv luv thiab koj tsis quav ntsej txog ib nrab℃ntawm no lossis nyob ntawd. Qhov tsis kam ntawm cov hlau nws tus kheej ntxiv rau koj qhov kev nyeem ntawv. Rau 10-meter cable khiav, koj tuaj yeem tawm ntawm 1-2 degree. Tsis zoo thaum koj BMS txiav txim siab raws li tus lej ntawd.
3-kabcompensates rau txhuas tsis kam thiab yog dab tsi feem ntau industrial setups siv. Zoo txaus rau 90% ntawm daim ntawv thov. Nov yog peb lub neej tam sim no.
4-kabtshem tawm cov hlau lead ua haujlwm tag nrho. Peb siv nws rau lub xov tooj ntawm tes- kev soj ntsuam qib thaum lub sijhawm R&D thiab siv tau, thiab rau txhua tus neeg siv khoom uas tau them nyiaj rau qhov raug. Tsis tas li yuav tsum tau ua rau txhua lub roj teeb lithium OEM cov kev daws teeb meem uas cov neeg siv khoom ua lawv tus kheej daim ntawv pov thawj kev nyab xeeb - cov neeg tshawb xyuas nyiam pom 4-xaim.
Qhov kev sib cav xaus thaum peb tus txiv neej kho vajtse hais tias "Kuv tuaj yeem khiav ob lub xov tooj ntxiv lossis kuv tuaj yeem piav qhia rau tus neeg siv khoom vim li cas lawv qhov kev tiv thaiv thermal khiav ua rau 3℃lig." Peb khiav 4- xaim ntawm tag nrho cov khoom siv hluav taws xob tam sim no. Tus nqi ntxiv yog li 0.3% ntawm tus nqi pob. Tsis tsim nyog poob pw tsaug zog.
Qhov twg los lo rau lawv (Placement Tiag Matters)
Peb tau pom qee cov khoom qus los ntawm lwm cov tuam txhab lag luam roj teeb. Sensors zip- khi rau qhov chaw random. Sensors nias tawm tsam rooj plaub nrog ib daim ntawm npuas. Ib qho kev soj ntsuam nco tau qhov twg peb pom lub sensor uas tau poob tag nrho thiab tsuas yog dangling hauv lub thawv, nyeem cua kub thaum lub hlwb ua noj.
Peb cov cai tam sim no:
Ntawm cov hlwb
Kev sib cuag ncaj qha nrog cov ntaub ntawv, thermal paste lossis 3M VHB daim kab xev (peb nyiam 9888T), ces potted nrog epoxy. Yog nws nyuaj rau rework. Qhov ntawd yog lub ntsiab lus. Yog hais tias ib tug neeg yuav tsum tau chisel los ntawm epoxy txav lub sensor, lawv yuav xav ob zaug seb lawv puas xav tau.
Nruab nrab ntawm cov hlwb
Catch kub kub los ntawm cov hlwb uas degrading sai dua lawv cov neeg nyob ze. Qhov no yog li cas peb pom ib pawg ntawm cov hlwb los ntawm tus neeg xa khoom uas muaj qhov tsis xws luag sab hauv - ib lub xov tooj tau khiav 8℃kub dua li nws cov neeg nyob ze. Tau ntes nws ua ntej muaj dab tsi phem tshwm sim, hloov lub module, taug qab nws rov qab mus rau ntau qhov chaw tsim khoom, tsis lees paub tag nrho cov khoom. Lub sensor them rau nws tus kheej txog 10,000 zaug nyob rau hnub ntawd.
Busbars thiab kev sib txuas
Loose bolts ua kom sov. Ntau heev. Peb muaj ib lub pob uas lub ntsiab contactor lub davhlau ya nyob twg tsis torqued kom zoo, thiab nyob rau hauv siab tam sim no tau tsoo 85℃thaum lub hlwb nyob ze ntawm 35 degree. Cov neeg siv khoom yws txog "random" lub zog derating. Tsis yog random ntawm tag nrho - BMS tau ua raws nraim li nws yuav tsum ua. Kho qhov kev sib txuas, teeb meem ploj mus. Tam sim no txhua pob muaj lub sensor ntawm txoj kev tseem ceeb tam sim no, tsis yog - sib tham.
Coolant hauv / tawm
Yog tias koj muaj kev ua kom txias, koj yuav tsum paub tias nws puas ua haujlwm. Pom ntau lub tshuab uas lub twj tso kua mis tuag thiab tsis muaj leej twg pom txog thaum lub hlwb pib o.
Cov khoom uas lawv tsis muab tso rau hauv cov ntaub ntawv
Nov yog qee yam uas peb tau kawm los ntawm kev rub tawm:
Self- cua sov yog tiag tiag
Tam sim no koj thawb los ntawm RTD los ntsuas nws kuj heats nws. Tus qauv yog 1mA rau Pt100. Peb muaj ib tug engineer junior ib zaug uas cranked nws mus rau 5mA vim hais tias "loj teeb liab, zoo dua qhov tseeb, txoj cai?" Tsis yog. Lub sensor tau nyeem 2℃siab. Hauv 48V golf lub laub pob nws tsuas yog txhais tau tias thaum ntxov kiv cua tig-rau. Hauv 400V kev lag luam pob nws yuav txhais tau tias muaj kev cuam tshuam tsis zoo. Siv 1mA. Los yog tsawg dua rau Pt1000.
Hlau routing tseem ceeb
Khaws RTD cov xov hlau kom deb ntawm lub hwj chim cables, lub cev muaj zog tsav, inverters - txhua yam uas hloov cov dej loj. Peb siv shielded twisted khub tam sim no tom qab siv peb hnub debugging ib tug "noisy kub teeb liab" uas tig tawm EMI los ntawm ib tug VFD mounted 20cm deb. Lithium roj teeb cov neeg muag khoom lag luam yuav tsum nco ntsoov: yog tias koj tab tom muag cov pob khoom thiab cov neeg koom ua ke tso BMS nyob ib sab ntawm lub cev muaj zog, kev nyeem ntawv kub yuav yog cov khib nyiab.
Cov chav kawm kam rau ua tsis yog qhov tseeb
A Class B Pt100 tuaj yeem tawm los ntawm ± 0.8℃ntawm 100℃ib qho spec. Qhov ntawd yog qhov ALLOWABLE yuam kev. Yog tias koj BMS xav tias nws tuag lawm thiab teeb tsa thermal txwv ntawm 60 degree, koj yuav raug txwv ntawm 59.2℃lossis 60.8 degree. Tsim koj cov kev txwv nrog kev siab ntev hauv siab. Peb tsim hauv 2℃npoo ntawm tag nrho peb cov kev tiv thaiv.
Pheej yig sensors drift. Zoo sensors tsis
Peb tau taug qab cov sensors los ntawm peb tus neeg muag khoom sib txawv tshaj li 2 xyoos ntawm kev ua haujlwm. Cov peev nyiaj (xws li $ 0.80 txhua) drifted qhov nruab nrab ntawm 0.6℃. Qhov nruab nrab -ntau cov neeg Nyij Pooj ($ 2.50) drifted 0.1℃. Tus hwm Swiss sawv daws yuav ($8) drifted yeej tsis muaj dab tsi tab sis c'mon, $8 ib sensor? Peb siv cov Japanese. Tus nqi zoo tshaj plaws rau cov khoom lag luam.
Vim li cas peb Standardized ntawm Pt100 Hla Txhua Yam
Peb tau muaj kev sib xyaw ua ke: NTC thermistors ntawm cov nqi qis - cov nqi pob khoom, Pt100 ntawm cov hwm zoo, qee qhov txawv KTY sensors ntawm cov khoom qub txeeg qub teg. Nws yog ib tug npau suav phem. Qhov sib txawv calibration curves, txawv BMS firmware ceg, sib txawv cov khoom seem seem.
Tam sim no nws yog Pt100 txhua qhov chaw. Tib lub sensor, tib tus neeg xa khoom, tib cov txheej txheem tuav. Thaum muaj ib yam dab tsi tsis ncaj ncees lawm, peb tsis tas yuav nug "tos, hom sensor twg nyob hauv pob no?" Kev sib xyaw roj teeb ua haujlwm tau yooj yim dua thaum koj tsis juggling tsib hom sensor sib txawv.
Tus nqi sib txawv ntawm NTC thiab Pt100 zoo li $ 1.50 rau ib lub sensor. Ntawm $3000 forklift roj teeb pob, uas yog suab nrov. Ntawm kev ntseeg siab thiab kev txhawb nqa tus nqi, nws yog txhua yam.
Rau leej twg Speccing Sensors tam sim no
Yog tias koj yog tus tsim engineer nyeem qhov no, ntawm no yog luv luv version:
Siv Pt100 lossis Pt1000. Coiled caij rau txhua yam dhau 100V lossis txhua yam uas vibrates. Nyias zaj duab xis yog qhov zoo rau kev sim lub rooj ntev zaum thiab qis - kev saib xyuas cov ceg txheem ntseeg . 3- xaim yam tsawg kawg nkaus, 4-xaim yog tias koj tab tom ua ntawv pov thawj lossis ua haujlwm raug.
Yuav los ntawm cov tsim sensor tsim nrog qhov tseeb traceability. Peb tau pom Pt100s cuav uas yog NTCs tiag tiag nrog cov cim cuav. Yog hais tias tus nqi zoo li zoo dhau los ua qhov tseeb, nws yog.
Npog koj cov sensors. Siv cov khoom siv thermal interface. Lim- nyem koj cov kab. Sau koj qhov chaw sensor kom cov kws tshaj lij tsis zoo 5 xyoo txij li tam sim no paub qhov chaw saib.
Thiab rau ib tus neeg muab cov pob khoom: nug koj tus neeg muag khoom seb lawv siv dab tsi thiab vim li cas. Yog tias lawv tsis tuaj yeem muab cov lus teb ncaj nraim rau koj, qhov ntawd qhia koj qee yam. Yog tias lawv hais tias "peb siv platinum RTDs vim peb tau kawm txoj kev nyuaj yuav ua li cas thaum koj tsis ua," nws yog tus neeg muag khoom uas nyob ib puag ncig ntev txaus kom paub qhov tseem ceeb.
Peb tau ua lithium roj teeb pob rau ntau tshaj kaum xyoo tam sim no - forklifts, golf laub, AGVs, floor scrubbers, koj npe rau nws. Kev ntsuas kub yog tej zaum 0.5% ntawm BOM tus nqi thiab 50% ntawm thaj chaw tsis ua haujlwm hauv paus ua rau peb tau kuaj pom. Nws tsuas yog tsis tsim nyog pheej yig tawm ntawm.
Yog tias koj tab tom nrhiav ib pab neeg uas tau tawm hws cov ntsiab lus ntawm cov khoom zoo li no, koj paub qhov twg los nrhiav peb. Peb ib txwm zoo siab los tham txog kev tswj xyuas thermal nrog txhua tus neeg uas mob siab rau kom tau txais qhov raug.
Thiab yog hais tias ib tug neeg ntawm koj pab neeg xav kom txuag tau $ 1.50 ib pob los ntawm kev hloov mus rau NTCs, xav tias dawb xa lawv tsab xov xwm no. Los yog daim ntawv them nqi los ntawm qhov xwm txheej 2019 ntawd. Txawm li cas los xij.
