Ukuba isibambi sebhetri se-18650 eklasini yakho okanye kwilebhu yerobhothiki siyanyibilika, ayisoloko iyibhetri ngokwayo engunobangela ophambili. Ingxaki phantse rhoqo ivela kwisibambi sebhetri ngokwaso: izikhongozeli zeplastiki ezingabizi kakhulu nezixhaphakileyo zisebenzisa iintsimbi ezijijekileyo (coil springs) zentsimbi egqunywe nge-nickel ezinezinga eliphezulu lokuxhathisa umbane. Xa i-ESP32 ithumela ngothungelwano lwe-WiFi okanye imoto ye-DC ephantsi ngexabiso ixinga, umbane otsalwa kuloo ntsimbi ixhathisayo ujika amandla ombane abe bubushushu obukhulu obugxile kwindawo enye. Iplastiki iyathamba, intsimbi ye-spring iphelelwa kukomelela kwayo, ukuxhathisa kombane kuyenyuka ngakumbi, kwaye isikhongozeli siyanyibilika.

Ubalo Lobushushu be-Joule: P = I²R

Ukuze uqonde ukuba kutheni izikhongozeli zinyibilika, jonga ubudlelwane obusisiseko phakathi kombane (current) nokukhupha ubushushu: ukulahleka kwamandla kwii-watts kulingana nombane ophindwe kabini ngokuphindwe ngokuxhathisa (P = I²R).

Iprojekthi yerobhothiki yaseklasini eqhelekileyo inokudibanisa i-microcontroller (njenge-ESP32) kunye ne-dual-channel H-bridge driver kunye neemoto ezimbini ezityheli ze-TT gearmotors okanye i-N20 micro metal gearmotors. Qwalasela okwenzekayo ngexesha lokusebenza okuqhelekileyo:

• Ukunyuka ngequbuliso kwe-RF kwi-ESP32: Ngexesha lokuthumela nge-WiFi okanye ngexesha lohlengahlengiso, i-ESP32 itsala amaza ombane aphakathi kwe-250 mA ne-500 mA okwexeshana.
• Umbane wokuxinga nokuqalisa kweemoto: Xa isebenza ingathwalanga mthwalo, imoto eqhelekileyo ye-6V DC inokutsala i-150 mA ukuya kwi-200 mA. Nangona kunjalo, ngalo mzuzu umfundi abambe ivili, irobhothi ibetheke eludongeni, okanye isakhelo sayo siqala ukuhamba sisuka kwindawo engashukumiyo kumgangatho onekhaphethi, imoto nganye inokutsala lula phakathi kwe-1.2 A ne-1.8 A. Iimoto ezimbini ezixingileyo zitsala malunga ne-2.4 A ukuya kwi-3.6 A.

Xa zidityanisiwe, umbane uwonke otsalwa ngephanyazo ngexesha lokuxinga okanye xa isantya sikhula kakhulu ungafikelela kwi-3.0 A ukuya kwi-4.0 A.

Kwisidibanisi esisemgangathweni, ukuxhathisa kombane kwindawo edibanayo (contact resistance) kuncinci kakhulu (ngaphantsi kwe-0.01 Ω). Kodwa kwisikhongozeli se-18650 esingabizi kakhulu nesingenagama lophawu, i-spring yenziwe ngocingo lwentsimbi olujikiweyo olucwengiswe kancinci nge-nickel. Intsimbi inokuxhathisa kombane okuphindaphindwe malunga namatyeli amathandathu ukuya kasibhozo kunendibanisela yobhedu (copper alloys). Kubude bentsimbi ye-spring nakwindawo encinci edibana nesiphelo esingalunganga (negative terminal) sebhetri, ukuxhathisa kwendawo edibanayo kudla ngokulinganiselwa phakathi kwe-0.3 Ω ne-0.6 Ω kwisithuba ngasinye.

Ukuba umthwalo we-3 A udlula kwi-spring enokuxhathisa kwe-0.4 Ω:

P = (3 A)² × 0.4 Ω = 3.6 Watts

Ubungakanani obuzi-watts ezintathu ezinesiqingatha bobushushu obuthe gqolo obugxile kwincam ye-spring elinganiselwa kwiimilimitha ezimbini kuphela ngobubanzi buza kutshisa intsimbi ngaphezulu kwe-100°C ngemizuzwana embalwa. Izikhongozeli zeebhetri eziqhelekileyo zenziwe ngeplastiki ye-ABS yodidi oluphantsi okanye i-polypropylene engabizi kakhulu, ethamba malunga ne-80°C ukuya kwi-105°C.

Umjikelezo Wobushushu Oyonakalisayo kwii-Springs Ezingabizi Kakhulu

Kwakube ubushushu buqalile ukwanda, kuqala umjikelezo oyingozi owonakalisayo:

1. Ukuphelelwa kukomelela kwe-spring: Njengoko intsimbi ye-spring idlula ubushushu bayo bokusebenza, iyathamba iphelelwe kukutsiba kwayo (anneals).
2. Ukuhla koxinzelelo lwendawana edibeneyo: I-spring ethambileyo iyadodobala kancinci, ichebise amandla okutsindezela ngokwasemzimbeni kwisiphelo esingalunganga (negative terminal) sebhetri ye-18650.
3. Ukunyuka kokuxhathisa kombane: Uxinzelelo olusezantsi lokudibana lonyusa kwangoko ukuxhathisa kombane kwindawo edibeneyo.
4. Ukukhupha ubushushu obuphezulu: Ukuxhathisa okuphakamileyo kuvelisa ubushushu obuninzi kuloo mbane mnye, okukhawulezisa ukunyibilika kweplastiki engqongileyo de i-spring itshone ngaphakathi kwisikhongozeli okanye idale isiphaluka esifutshane (short circuit) kwisiphelo esikufutshane.

Indlela Yokuxilonga Le Ngxaki Kwidesika Yakho Yaselebhu

Ungakuqinisekisa ukuxhathisa kwendawo edibeneyo ngokusebenzisa i-multimeter yedijithali eqhelekileyo ngaphambi kokuba nayiphi na iplastiki iqalise ukutshisa:

1. Seta i-multimeter yakho ukuba ilinganise i-DC voltage (uluhlu lwee-millivolts).
2. Beka iphrobu enye ngqo kwisiphelo sesinyithi esisicaba esingalunganga (negative terminal) sebhetri ye-18650.
3. Beka enye iphrobu kwindawo yokudibanisa (solder lug) okanye iphini le-PCB apho i-spring ephuma kwicala elingalunganga iphuma khona kwisibambi seplastiki.
4. Layita irobhothi yakho uze uyalele iimoto ukuba zijike ngelixa ubambe amavili okomzuzwana ukulinganisa ukuxinga kwemoto kangangemizuzwana emibini.
5. Funda ukuhla kwe-voltage (V_drop) kuloo ndawo idibeneyo.

Ukuba ubona ukuhla kwe-0.5 V okanye ngaphezulu phantsi komthwalo, loo ndawo idibeneyo ilahlekelwa yi-voltage enkulu ize iyijike yonke ibe bubushushu. Ukuhla kwe-0.5 V kwi-3 A kulingana ne-1.5 W yobushushu obugcweleyo kwi-spring enye.

Iindlela Ezine Zokulungisa Le Ngxaki

1. Phuculela Kwizibambi Ze-Leaf Springs ze-Phosphor-Bronze

Ungaze usebenzise izibambi ze-spring zentsimbi kwimithwalo edlula i-1 A. Endaweni yoko, khetha izibambi zeebhetri ezineziqhoboshelo ze-leaf-spring ze-phosphor-bronze okanye beryllium-copper (ezifana nezibambi ze-SMD okanye ze-through-hole zodidi lwe-Keystone lwezoshishino). I-phosphor-bronze inika ukuxhathisa okuphantsi kakhulu kwaye igcina amandla e-spring nokuba amaqondo obushushu angqongileyo ayanyuka.

2. Sebenzisa Iibhetri ze-18650 Ezikhuselweyo

Abafundi bezikolo zamabanga aphakamileyo basoloko besenza iimpazamo zokudibanisa iingcingo. Ibhetri ye-lithium-ion ye-18650 engakhuselwanga inokukhupha ngaphezulu kwe-15 A ukuya kwi-30 A xa idibene ngendlela engeyiyo (dead short), itshise iingcingo ngokukhawuleza ize idale ingozi yomlilo. Soloko uxhasa iikiti zesikolo ngeebhetri ze-18650 ezikhuselweyo ezine-circuit module yokukhusela edibeneyo (PCM/BMS) kwisiphelo esingalunganga. Ezi bhodi zicima umbane ngokuzenzekelayo ukuba umbane udlula umda okhuselekileyo (ngokuqhelekileyo i-3 A ukuya kwi-6 A) okanye ukuba i-voltage ihla ngaphantsi kwe-2.5 V.

3. Khangela Ubukhulu Bocingo (Wire Gauge) Kunye Nee-Solder Lugs

Izikhongozeli zeebhetri ezingabizi kakhulu ezineengcingo ezisele zifakelwe zikholisa ukuza nocingo olucoliweyo lwe-28 AWG okanye 30 AWG olufihlwe phantsi kwe-insulation ye-PVC engqindilili. Phantsi kwemithwalo ye-2 A, ucingo ngokwalo lusebenza njengesifudumezi. Kwiiprojekthi zerobhothiki yasesikolweni ezitsala umbane omningi, qinisekisa ukuba iingcingo zombane zangaphakathi zisebenzisa ucingo olune-insulation ye-silicone lwe-20 AWG okanye 22 AWG.

4. Faka Ii-Fuses ze-PPTC Ezinokuseta Ngokutsha

Faka i-fuse engabizi kakhulu, ekwaziyo ukuzisetha ngokutsha ye-Polymeric Positive Temperature Coefficient (PPTC)—elinganiselwe malunga ne-2.0 A ukuya kwi-2.5 A yombane obanjwayo—ngoluhlu (in series) nocingo olulungileyo (positive lead) lwesibambi sebhetri yakho. Xa umfundi exingisa i-gearbox yemoto emlenzeni wedesika, i-PPTC itsibela ekuxhathiseni okuphezulu ngaphambi kokuba isikhongozeli sebhetri sifikelele kumaqondo obushushu anyibilikisayo, ize izisethe ngokutsha ngokuzenzekelayo xa umbane unqunyulwe.

Ukuxhobisa Iklasi Yakho

Ukwakha iiprojekthi zabafundi ezithembekileyo kuxhomekeke ekukhetheni amacandelo afanelekileyo kwimithwalo yombane eguqukayo yee-microcontrollers kunye nee-actuators. Ukuba uphonononga izixhobo zekhompyuter zelebhu yesikolo sakho okanye ufuna izinto ze-elektroniki zodidi lwaseklasini ezikwaziyo ukumelana novavanyo lwangempela lwabafundi, jonga uluhlu lwethu lwamacandelo kwi-Sheen Robotics Store okanye udibane neqela lethu nge-Lab Sourcing Solutions.