Test Station for Reed Sensors and Inductive Proximity Switches

Abs ac —The aim o ou wo k was o design and implemen a p og ammed sys em combined wi h mo emen . Ou sys em can isualize, eco d he signals o he connec ed senso wi h p ope sampling speed and displays i o e alua ion. The es s a ion is capable o ca ying ou a sampling speed o de ec he ypical cha ac e is ics o he Reed senso . The c ea ed measu ing sys em is he e o e capable o il e ing he unce ainly ope a ing senso s, and can be used o he examina ion o he seemingly aul y senso s as well. Keywo ds— cha ac e is ics, induc i e, LabVIEW, myDAQ, Na ional Ins umen s, Reed, senso I. INTRODUCTION HE aim o ou wo k was o design and implemen a sys em combined wi h mo emen . Ou sys em can eco d he signals o he senso wi h p ope sampling speed and displays i o e alua ion. Du ing ou wo k, Reed senso s and induc i e p oximi y swi ches we e used. Fig. 1. The induc i e p oximi y swi ch, P. Bánlaki and A. Lo as [1] The induc i e p oximi y swi ches de ec me al objec s wi hou con ac , and a e cha ac e ized by a long se ice li e and ex eme uggedness. I he e is a conduc o objec nea by, he gene a ed magne ic ield c ea es eddy cu en s in he me al and he swi ch ope a es acco ding o P. Bánlaki and A. Lo as [1]. Fig. 2. The cha ac e is ics o he Reed senso s, P. Bánlaki, A. Lo as [1] and Gy. K ámli [2] The Reed senso is an elec ical swi ch ope a ed by an applied magne ic ield. Fig. 1. shows ha he senso p o ides se e al swi ching anges which depend on he posi ion o he magne by P. Bánlaki, A. Lo as [1] and Gy. K ámli [2]. The magne ic induc ion is a ec o quan i y which ep esen s he s eng h o he magne ic ield. In a linea coil he magne ic ield is conside ed homogeneous, which depends on he numbe o h eads (N), he coil leng h (l) and he cu en densi y (I) and, whe e 'μ0' is he acuum pe meabili y. l NIμ B0  (1) The magne ic ield also depends on he 'μ ' ela i e pe meabili y ac o , which gi es an inc ease in he alue o he magne ic ield when using a a ie y o di e en han ai co es. l NIμμ B 0   (2) The magne ic ield s eng h:       m A μ B H (3) μμμ 0 (4) whe e 'μ '≈1 in case o pa a and diamagne ic ma e ials, while in case o 'μ '>>1 e omagne ic ma e ials. Fu he mo e, when a e omagne ic ma e ial is used he ollowing ela ion is obse ed: HμB (5) HμB (6) The cha ac e is ic o induc ion- ield s eng h o he e omagne ic ma e ials (i on, nickel, cobal and hei alloys) is s ongly non-linea , he de e mina ion is made TEST STATION FOR REED SENSORS AND INDUCTIVE PROXIMITY SWITCHES Vik ó ia ÁCS1, János TÓTH2 1 Uni e si y o Deb ecen, acs ik o [email protected] 2 Uni e si y o Deb ecen, o [email protected] T ANNALS OF THE UNIVERSITY OF ORADEA Fascicle o Managemen and Technological Enginee ing ISSUE #2, AUGUST 2017, h p://www.im uo adea. o/auo. m e/ 99 by measu emen . Fig. 3. shows he magne iza ion cu e, and he i s magne iza ion can be obse ed he eon, whe e Hm is he maximum ield s eng h, Hc is he coe ci e ield s eng h, while B is he alue o he emanen induc ion. Fig. 3. The magne iza ion cu e, I. Kádá [3] Neodymium disc magne s (VMM9-N48) wi h nickel su ace p o ec ion we e used du ing ou s udies. Ra e ea h elemen s such as neodymium ha e e omagne ic p ope ies. Neodymium alloy magne s (Nd2Fe14B) a e he s onges pe manen magne s known. Table I. shows he main p ope ies o he magne s by A. Ve ma, O. P. Pandey and P. Sha ma [4]. TABLE I PROPERTIES OF THE MAGNETS II. THE OPERATION OF THE TEST STATION Du ing he p ojec , we had o c ea e a sys em ha includes he da a acquisi ion de ice, he senso s, elec onics and mechanics and a compu e which uns he e alua ing p og am and also con ols he de ices. In he ollowing he cons uc ed sys em is demons a ed and he esul ing ela ionship be ween main pa s a e desc ibed. The cons uc ed sys em consis s o an NI myDAQ (Na ional Ins umen s Da a Acquisi ion De ice) (‘A’), a mo ing sys em (‘B’), a mo o con ol ci cui (‘C’), ol age adap a ion (‘D’), he senso (‘E’), powe supply (‘F’) and a compu e (‘G’). A 24 VDC powe supply is supplying o he senso and he mo o h ough he mo o con ol ci cui . The signal and he g ound wi e was connec ed o he ol age adap a ion, which c ea es 10 VDC ol age, so i can be sa ely connec ed o he NI myDAQ de ice inpu po s, since i can endu e ±10 VDC, S. Új á i, A. Magya ku i [5]. The da a acquisi ion de ice is esponsible o he ope a ion o mo o con ol ci cui , which ac ua e he mo emen sys em. When he limi swi ches o he mo ing sys em a e swi ch, hey send a signal o he myDAQ de ice ha comple ely s op he sys em o s a s he mo o he o he way, depending on how much was he numbe o displacemen s. A FESTO SME-8-K-LED-24 senso is an elec ic p oximi y swi ch wi h in e nal Reed senso , which has a wo king ol age 12-30 VDC and NO (No mally Open) con ac . Fig. 4. The schema ic s uc u e o he sys em As an induc i e p oximi y swi ch Baume IFRM 06P1503/S35L was used, ha also has no mally open and has 12-30 VDC wo king ol age. Fig. 5. The buil sys em Magne ype Remanence (B ) [mT] Coe ci i y (Hcb) [kA/m] Maximum o al ene gy (BHmax) [kJ/m3] neodymium (Nd2Fe14B) 1200-1300 800-1200 210-250 e i e (MF25) 350-400 240-320 27.5-31.5 ANNALS OF THE UNIVERSITY OF ORADEA Fascicle o Managemen and Technological Enginee ing ISSUE #2, AUGUST 2017, h p://www.im uo adea. o/auo. m e/ 100 A. NI myDAQ In he buil sys em, he Na ional Ins umen s myDAQ de ice is signed wi h ‘A’ in he p e ious igu es. I can be seen ha he da a acquisi ion de ice is connec ed di ec ly o indi ec ly o all o he main pa s. The da a acquisi ion (‘A’) is in di ec con ac wi h he compu e , on which he p og am is esponsible o he de ec ion, he mo emen and he e alua ion. I is in di ec connec ion wi h he mo o con ol uni (‘C’), since he condi ions de ined in he p og am sends a signal o mo e o one o he o he di ec ion, and sends a signal o he de ice h ough he p og am in case o a limi . Fu he mo e, i connec s ia he ol age adap a ion ci cui (‘D’) o he senso (‘E’), since i canno be connec ed di ec ly because o he inpu ol age (± 10 VDC) o he myDAQ analog inpu po s. B. Senso mo ing sys em Since o Reed senso s he magne is wo h applied in wo di e en posi ion (pa allel o he senso , he no h pole is in line wi h he mo ing di ec ion and hen pe pendicula , when he no h pole poin ing owa ds he senso ), so we had o c ea e a ame ha is easily changed, R. H. Bishop [6]. Mo se- ype ' ische echnik' limi swi ches we e used. The myDAQ +5 VDC was connec ed o he ‘1’ connec o and he no mally open connec o (‘3’) was a ached he myDAQ digi al inpu (DIO Digi al Inpu o Ou pu ) po (posi i e limi swi ch ‘DIO4’, nega i e limi swi ch ‘DIO3’). When he sys em eaches an end posi ion, he con ac is closed, so he +5 VDC signal is sen o he myDAQ. Sensing his inpu will s op u he mo emen , hen e e sed mo e in di ec ion o s op he p ocess depending on he numbe o epe i ions he sys em ha e pe o med. C. Mo o con ol The di ec ion o 24 VDC mo o o a ion can be changed when he pola i y o he ol age is changed, he e o e we made a ci cui including an H-b idge in eg a ed ci cui (L298N IC). The ci cui is designed o con olling wo DC mo o s which can be swi ched on o o wi h a dedica ed inpu (Enable A, B) independen ly. Fig. 6. Mo o con ol ci cui As shown in Fig. 6, we used wo kinds o powe supply in he designed ci cui . The +5 VDC powe comes om he myDAQ de ice, which is esponsible o ope a ing he ga e ci cui s, while he +24 VDC powe supplies he ex e nal powe supply, i is esponsible o ope a ing he mo o . Since o iginally he ci cui is capable o simul aneously d i ing wo DC mo o s, bu we we e only need one, so we did no use up all p o ided inpu s and ou pu s. To ‘Ou 1’, ‘Ou 2’ we connec ed he mo o , while ‘Ou 3’ and o ‘Ou 4’ ou le s we e no connec ed du ing his p ojec . The men ioned Enable (‘EN_A’, ‘EN_B’), enable inpu co esponds wi h wo independen H-b idges. The ‘EN_A’ ou le was connec ed o he myDAQ ‘DIO0’ (Digi al Inpu o Ou pu ) po . We do no use all he connec ions on he inpu side as well. The ‘IN1’ and ‘IN2’ inpu a e esponsible o d i ing he ‘A’ mo o one o he o he di ec ion, while ‘IN3’ and ‘IN4’ a e o he ‘B’ mo o . I ‘IN1’ ecei es inpu signal om myDAQ ‘DIO1’ po hen mo o s a s in one di ec ion, p o ided ha he EN_A also ecei es a signal. Unde he same condi ions when ‘IN2’ inpu om ‘DIO2’ po , i will o a e in he opposi e di ec ion. III. MEASUREMENT PROGRAM The p og am was made wi h LabVIEW 2013. Labo a o y Vi ual Ins umen Enginee ing Wo kbench (LabVIEW) is a de elopmen en i onmen om Na ional Ins umen s. Fig. 7. The o al mo o con ol p og am Du ing he de elopmen o he p og am he i s majo pa was he mo o con ol uni . The segmen , which is ANNALS OF THE UNIVERSITY OF ORADEA Fascicle o Managemen and Technological Enginee ing ISSUE #2, AUGUST 2017, h p://www.im uo adea. o/auo. m e/ 101 esponsible o mo ing he sys em can be seen in Fig. 7. Since he mo o con ol ci cui inpu Enable (‘DIO0’) I had o gi e a signal con inuously, bu ‘IN1’ (‘DIO1’) and ‘IN2’ (‘DIO2’) po s a e al e na ely needed, he e o e, we sol ed wi h one o he commonly used design pa e n, wi h a s a e machine ha includes a a ie y o condi ions [7], [8]. Howe e , he sys em can be in only one s a e a a ime, and ansi ions be ween hem a e s ic ly de ined. Fig. 8. The F on Panel The p og am consis s o h ee main pa s and in he F on Panel he use can swi ch be ween hem. The i s is he ‘Se ings’ (1.) whe e he en e ing o op ions o he measu emen can be ca ied ou . The nex window (2.) is in ended o ca y ou he implemen a ion o he mo emen and he measu emen . The g aph con inuously displays he cu en alues du ing he measu emen . The e alua ion can be ound in he las sec ion (3.). The se ings ha we e speci ied in he i s panel a e ead back o he p og am, and i displays hem in he equi ed in o ma ion (File name, used channel, senso ype, measu emen ime) and includes a g aph ha displays he comple e se ies o measu emen alues in an easily unde s andable way. Fig. 9. The measu ing p og am The p og am segmen ha is esponsible o measu ing ol age was c ea ed an analog inpu (AI) channel using he DAQmx C ea e Vi ual Channel. i ( i ual ins umen ). This equi ed a con olle which is displayed ANNALS OF THE UNIVERSITY OF ORADEA Fascicle o Managemen and Technological Enginee ing ISSUE #2, AUGUST 2017, h p://www.im uo adea. o/auo. m e/ 102 on he F on Panel (‘Measu emen Channel’), whe e he physical measu emen channels can be selec ed and also he senso powe supply can be adjus ed, which will be educed by he a io o he ol age adap a ion. Using he DAQmx Timing. i was using we se he clock used du ing he measu emen , he sampling equency and he numbe o samples pe channel, and hen se he DAQmx S a Task. i o un. The con inuous measu emen happens wi hin he While loop on he based on he p e ious se ings, display, and expo he da a o a *. dms ile (TDMS - Technical Da a Managemen S eaming). Ou side he loop he e is he DAQmx Clea Task. i o s op and cancel he job opened, he eby eleasing he esou ces ha a e used in he ac i i y. IV. EVALUATION The hi d componen in F on Panel is in cha ge o e alua ing all o he measu ed da a. In case o an ac i e s a e o 'E alua e' swi ch, he so wa e will open he sa ed ile using he 'TDMS Open' om he sa ed loca ion con ol wi h he use o a local a iables. Then he p og am eads he da a and he used channel in he measu emen wi h 'TDMS Read', and he collec ed p ope ies o he logged ile using he 'TDMS Ge P ope ies' block. The i s h ee elemen s o he 'clus e ' con ain he name o he ile ha was c ea ed, he senso ype and exac measu emen ime. The e alua ion p ocess does no ac ually equi e myDAQ de ice connec ed o i , because you only need o ile * . dms o c ea e he g aph. Hence o h we would like o illus a e and analyse g aphs ob ained du ing he e alua ion. The measu emen s we e ca ied ou se e al imes in pa allel and pe pendicula posi ion ela i e o he senso o be sa is ied ha he e is no measu emen e o . Fig. 10. Cha ac e is ic o IFRM 06P1503 senso in pa allel posi ion Fig. 10. shows he swi ching cha ac e is ics we measu ed when he Baume IFRM 06P1503/ S35L ype was used. In he i s case, he magne is posi ioned pa allel o he de ec ion su ace, and hen he magne is o a ed 90°. In his case, he image shown in Fig. 11. was ob ained. The wo diag ams in ac only di e om each o he , ha in i s si ua ion he longe side o he magne was acing he sensing su ace, while in he second sho e side, so i emained wi hin sensing ange o a sho e ime as well. The eal challenge was o measu e he cha ac e is ics o he Reed senso s, because as s a ed ea lie , was shown in Fig. 2., app oaching he senso la e ally i may esul wo o e en h ee swi ching on and o anges in ce ain con igu a ions. Fig. 11. IFRM 06P1503 cha ac e is ic in pe pendicula posi ion The used senso was a FESTO SME-8-K-LED-24, which was placed pa allel o he magne i s . A e mul iple measu emen s, we we e able o de ec he cha ac e is ics seen in Fig. 12. wi h he ools we used. I can be obse ed he ypical na u e o he Reed senso s iple segmen ed cha ac e is ic, which is a esul because o he h ee imes on and o swi ching. Fig. 12. SME-8-K senso cha ac e is ic in pa allel posi ion Fig. 13. SME-8-K senso cha ac e is ic in pe pendicula posi ion ANNALS OF THE UNIVERSITY OF ORADEA Fascicle o Managemen and Technological Enginee ing ISSUE #2, AUGUST 2017, h p://www.im uo adea. o/auo. m e/ 103 In case o pe pendicula magne posi ion he FESTO SME-8 senso shows he cu e seen on Fig. 13. This suppo s he nominal cha ac e is ics o he Reed senso s, shown in Fig. 2. based on he p o essional li e a u e da a. The newly c ea ed measu ing sys em is he e o e capable o il e ing he unce ain ope a ing senso s, and can be used o he examina ion o he seemingly aul y senso s as well. V. SUMMARY We came o he conclusion on he basis o he measu emen s ha he p og am we c ea ed and he equipmen used is capable o ca ying ou a sampling speed o de ec he ypical cha ac e is ics o he Reed senso . We managed o build a small and compac sized de ice. The on panel o he p og am is use - iendly, clea and i is easy o na iga e. As a esul , we a e able o measu e in he housand hs o a second wi h he ools used and o iew and analyse de ail-o ien ed. The de eloped sys em can become mo e accu a e, mo e e icien and easie o use wi h a ew imp o emen s. We plan on designing mo e p ecise, mo e accu a e senso and magne holde ha would elimina e he measu emen e o s due o acciden al mo emen s. These as ene s could be made wi h 3D p in ing, which is compa ible wi h he exis ing moun ing g oo es. In he u u e, we wan o de elop a mo e complex p ocessing sys em, which does no lea e use e alua ion o he cha s o he use s, bu i au oma ically and displays. Al hough a conclusion may e iew he main poin s o he pape , do no eplica e he abs ac as he conclusion. A conclusion migh elabo a e on he impo ance o he wo k o sugges applica ions and ex ensions. REFERENCES [1] P. Bánlaki, A. Lo as, “Ma e ials o senso s” (Szenzo ika és anyagai), Budapes : Typo ex Kiadó, 2012, p 48-56. [2] Gy. K ámli, “FESTO Senso s” (FESTO Szenzo ika) FESTO K ., Budapes , 2007, pp 3-22. [3] I. Kádá , “Al e na ing cu en sys ems” (Vál akozó á amú endsze ek), h ps:// e .bme.hu/si es/de aul / iles/ an a gyi_ ajlok/h,%202015/ 04/13%20-%2009%3A40/magnes_2.pd , accessed on Janua y 2017. [4] A. Ve ma, O. P. Pandey and P. Sha ma, “S oncium e i e pe manen magne – An o e iew” Indian Jou nal o Enginee ing & Ma e ial Sciences, ol. 7, Dec. 2000, pp. 364-369 h p://nop .niscai . es.in/bi s eam/123456789/24430/1/IJEMS%2 07%285-6%29%20364-369.pd [5] S. Új á i, A. Magya ku i, NI myDAQ use manual and speci ica ions (NI myDAQ használa i u así ás és speci ikáció), h p://sukja o.eu/ELFT-NI-palyaza /myDAQ_magya .pd , accessed on No embe 2016. [6] R. H. Bishop, The Mecha onics Handbook, Boca Ra on FL: CRC P ess, 2002. [7] LabVIEW Co e 1 Pa icipan Guide Cou se So wa e Ve sion 2014, Aus in, Texas: Na ional Ins umen s Co po a ion, 2014. [8] LabVIEW Co e 2 Pa icipan Guide Cou se So wa e Ve sion 2014, Aus in, Texas: Na ional Ins umen s Co po a ion, 2014. ANNALS OF THE UNIVERSITY OF ORADEA Fascicle o Managemen and Technological Enginee ing ISSUE #2, AUGUST 2017, h p://www.im uo adea. o/auo. m e/ 104