Ambiri ogwiritsira ntchito magetsi amagwiritsira ntchito mphamvu zochepa zotsutsana ndi mphamvu, zomwe zimakhala ndi madzi okwanira 1/8 kapena osachepera. Komabe, mapulogalamu monga magetsi, mabasi amphamvu, kutembenuka kwa mphamvu, amplifiers, ndi heaters nthawi zambiri amafuna mphamvu zoteteza mphamvu. Nthawi zambiri mphamvu zamphamvu zotetezera ndizopewera zomwe zimayikidwa pa 1 watt kapena katundu wambiri ndipo zimapezeka ku kilowatt.
Power Resistor Basics
Mphamvu ya kukana imatanthawuza momwe mphamvu yothetsera imatha kukhalira bwinobwino musanayambe kusokonezeka. Mphamvu yosokonezeka ndi kukana ingapeze mosavuta lamulo loyamba la Joule, Mphamvu = Mphamvu x Pano ^ 2. Mphamvu yotsutsana ndi kukana imatembenuka kutentha ndikuwonjezera kutentha kwa kusagwira. Kutentha kwa kukana kudzapitirira kukwera mpaka kufika pamtunda kumene kutentha kumatuluka kupyolera mu mpweya, bolodi la dera, ndi malo oyandikana nawo kumachepetsa kutentha komwe kumapangidwira. Kusunga kutentha kwapopewera kumapewa kuwonongeka kwa kukana ndikulolera kuthana ndi mafunde aakulu popanda kuwonongeka kapena kuwonongeka. Kugwiritsa ntchito mphamvu yotsutsa mphamvu pamwamba pa mphamvu yake ndi kutentha kungayambitse zotsatira zoopsa kuphatikizapo kusinthana kwa kukaniza, kuchepetsa nthawi yogwira ntchito, dera lotseguka, kapena kutentha kwambiri kotero kuti kukana kungatenthe moto kapena kumagwiritsa ntchito zipangizo zozungulira pamoto. Pofuna kupewa miyeso yolephera, mphamvu zotsutsa zimakonda kusekedwa pogwiritsa ntchito zoyembekezeredwa .
Mphamvu zolimbana ndi mphamvu zowonjezera zimakhala zazikulu kusiyana ndi anzawo ochepa. Kuwonjezeka kwa kukula kumawathandiza kutaya kutentha ndipo nthawi zambiri amagwiritsidwa ntchito popereka njira zowonjezera za heatsinks. Mphamvu zoteteza mphamvu zamtunduwu zimapezeka nthawi zambiri m'mapalasiti a moto otentha kuti athetse chiopsezo cha vuto lolephera.
Kukaniza Mphamvu Kumbuyo
Kulingalira kwa mphamvu zamagetsi kumatanthawuzira kutentha kwa 25C. Pamene kutentha kwa kuthamanga kwa mphamvu kumakwera pamwamba pa 25C, mphamvu yomwe yotsutsa ikhoza kuyendetsa imayamba kugwa. Kuti agwirizane ndi zomwe zikuyembekezeredwa, opanga amapereka chithunzi chomwe chimasonyeza kuti mphamvuyo imatha kupirira ngati kutentha kwake kukukwera. Popeza 25C ndikutentha kwa chipinda, ndipo mphamvu iliyonse imene imasokonezeka ndi kuteteza mphamvu kumapangitsa kutentha, kuthamanga kwa mphamvu pamagwiridwe ake amphamvu nthawi zambiri kumakhala kovuta kwambiri. Kuwerengera zotsatira za kutentha kwa opangira opanga mankhwala kumapereka mphamvu yowononga mphamvu kuti athandizire olemba mapangidwe kuti azikonzekera zovuta zenizeni za dziko. Ndi bwino kugwiritsira ntchito mphamvu ya derating monga chitsogozo ndikukhala bwino m'deralo. Mtundu uliwonse wa kukana udzakhala ndi mtundu wina wosiyana ndi wotsekemera ndi zosiyana zolimbitsa thupi.
Zinthu zingapo zakunja zingakhudze mphamvu yothetsera mphamvu ya kukana. Kuwonjezera mpweya wokakamizidwa, kutentha, kapena chigawo chabwinoko chothandizira kutaya kutentha komwe kumapangidwa ndi kukana kumalola mphamvu yosagwira ntchito kuti ikhale yamphamvu komanso kusunga kutentha. Komabe, zifukwa zina zimalimbana ndi kuzizira, monga kutentha komwe kumapangidwira kutentha kwapakati, malo ozungulira omwe amachititsa kutenthetsa kutentha komanso zinthu monga chilengedwe ndi kumtunda.
Mitundu ya High Power Resistors
Mitundu yambiri ya magetsi amphamvu amapezeka pamsika. Mtundu uliwonse wa kutsutsa umapereka mphamvu zosiyana pa ntchito zosiyanasiyana. Zida zowonongeka ndizofala ndipo zimapezeka m'zigawo zosiyanasiyana, kuyambira pamwamba pa phiri, radial, axial, ndi pa chisilamu mapangidwe opangira kutentha kwabwino. Zosakanikirana zopanda mphamvu zamagetsi zimapezekanso pazowonjezera zamagetsi zamtundu wapamwamba. Chifukwa chogwiritsa ntchito mphamvu zamakono, monga braking, anti-nichrome wire resistors, zomwe zimagwiritsidwa ntchito ngati zotentha, ndizo zabwino kwambiri, makamaka pamene katunduyo akuyenera kukhala mazana ambiri a watts.
- Wowonongeka wa Wirewound
- Cement Resistors
- Film Resistors
- Metal Film
- Chophatikiza Chokha
- Nachrome Wire
Zochitika za Fomu
- DPAK Resistors
- Chasis Mount Resistors
- Oima (oima) otsutsa
- Axial Resistors
- Oteteza Phiri la Phiri
- Kupyolera mu hole-hole