A. Chitetezo chabwino cha malonda ndi kukana kwamphamvu kwa overvoltage

Popeza ma capacitor a filimu ali ndi mphamvu zodzichiritsa okha ndipo adapangidwa motsatira muyezo wa 1EC61071, kukana kwa mphamvu ya ma surge voltage ya capacitor kumaposa 1.5 ya mphamvu ya ma surge voltage. Kuphatikiza apo, capacitor imagwiritsa ntchito ukadaulo wa filimu yogawanika, kotero capacitor sipanga kusokonekera kwa ma short circuit mu chiphunzitso, zomwe zimathandizira kwambiri chitetezo cha mtundu uwu wa capacitor. Njira yodziwika bwino yolephera ndi open circuit. Mu ntchito zinazake, kukana mphamvu ya ma peak voltage ya capacitor ndi chizindikiro chofunikira poyesa ma capacitor. Ndipotu, kwa ma capacitor a electrolytic, mphamvu ya ma surge voltage yovomerezeka ndi nthawi 1.2, zomwe zimakakamiza ogwiritsa ntchito kuganizira mphamvu ya ma peak voltage m'malo mwa mphamvu ya nominella.

B. Makhalidwe abwino a kutentha, kutentha kwa malonda ndi kwakukulu, kuyambira -40C-105C

Filimu ya polypropylene yotenthetsera kwambiri yomwe imagwiritsidwa ntchito mu DC support film capacitor imakhala ndi kukhazikika kwa kutentha komwe filimu ya polyester ndi ma electrolytic capacitors alibe. Pamene kutentha kukukwera, mphamvu ya polypropylene film capacitor imachepa konsekonse, koma chiŵerengero chocheperako chimakhala chochepa kwambiri, pafupifupi 300PPM/C; pomwe mphamvu ya polyester film imasintha kwambiri ndi kutentha, kaya pa siteji yotentha kwambiri kapena pa siteji yotentha yochepa, yomwe ndi +200~+600PPM/C.

C. Makhalidwe okhazikika a pafupipafupi, makhalidwe abwino a pafupipafupi kwambiri a chinthucho

Pakadali pano, ma frequency ambiri osinthira owongolera ndi pafupifupi 10K HZ, zomwe zimafuna kuti chinthucho chikhale ndi magwiridwe antchito abwino kwambiri. Kwa ma capacitor a electrolytic ndi ma capacitor a polyester film, izi ndi vuto.

D. Palibe polarity, imatha kupirira voteji yobwerera

Ma electrode a ma capacitor a filimu ndi zitsulo zazing'ono zomwe zimayikidwa pa mafilimu opyapyala. Chogulitsachi chilibe polarity, kotero ndi chosavuta kwa ogwiritsa ntchito, ndipo palibe chifukwa choganizira za mitengo yabwino ndi yoipa. Kwa ma capacitor a electrolytic, ngati voltage yobwerera yoposa nthawi 1.5 Un igwiritsidwa ntchito pa capacitor ya electrolytic, imayambitsa reaction ya mankhwala mkati mwa capacitor. Ngati voltage iyi ikhala nthawi yayitali, capacitor idzaphulika, kapena electrolyte idzatuluka pamene kuthamanga kwamkati kwa capacitor kukutulutsidwa.

E. Mphamvu yamagetsi yapamwamba, palibe zotsutsana ndi zotsatizana ndi zoyezera zoyezera

Pofuna kuwonjezera mphamvu yotulutsa mphamvu, mphamvu ya mabasi ya magalimoto osakanikirana ndi magalimoto amafuta ikukwera. Mphamvu yamagetsi ya batri yomwe imaperekedwa ku ma mota omwe ali pamsika ndi 280V, 330V ndi 480V. Ma capacitor omwe amafanana nawo ndi osiyana ndi opanga osiyanasiyana, koma nthawi zambiri amakhala 450V, 600V, 800V, ndipo mphamvu yake imayambira pa 0.32mF mpaka 2mF. Mphamvu yamagetsi ya ma capacitor amagetsi si yokwera kuposa 500V, kotero mphamvu yamagetsi ya basi ikapitirira 500V, dongosololi limangowonjezera mphamvu yamagetsi ya capacitor polumikiza ma capacitor amagetsi motsatizana. Mwanjira imeneyi, sikuti kuchuluka ndi mtengo wa capacitor bank zimawonjezeka, komanso inductance ndi ESR mu circuit zimawonjezeka.

F. ESR Yotsika, kukana kwamphamvu kwa ripple current

Kachipangizo ka filimu ndi kokulirapo kuposa 200mA/μF, ndipo kachipangizo ka electrolytic kali ndi mphamvu ya ripple current ya 20mA/μF. Mbali imeneyi ingachepetse kwambiri mphamvu ya kachipangizo kamene kakufunika mu dongosololi.

G. Low ESL

Kapangidwe ka inverter kotsika kwambiri ka inverter kamafuna kuti gawo lake lalikulu, DC-Link capacitor, likhale ndi inductance yochepa kwambiri. Ma capacitor a DC-Link DC filter film capacitor ogwira ntchito kwambiri amalumikiza busbar mu capacitor module kuti achepetse inductance yake yokha (<30nH), zomwe zimachepetsa kwambiri kugwedezeka kwa mphamvu pa nthawi yosinthira yofunikira. Chifukwa chake, capacitor yoyamwa yomwe imalumikizidwa motsatira DC-Link capacitor nthawi zambiri imasiyidwa, ndipo capacitor electrode imalumikizidwa mwachindunji ku IGBT.

H. Kukana kwamphamvu kwa mafunde amphamvu

Imatha kupirira mafunde akuluakulu nthawi yomweyo. Ukadaulo wodula mafunde ndi ukadaulo wokhuthala wa capacitor coating ukhoza kupititsa patsogolo kutentha kwa mphamvu yamagetsi komanso kuthekera kwa kugwedezeka kwa makina.

J. Utumiki wautali

Makhalidwe osakalamba a filimuyi amatsimikizira kuti capacitor ya filimuyi imakhala ndi moyo wautali kwambiri, makamaka pamagetsi ovotera komanso kutentha kogwiritsidwa ntchito, moyo wautumiki ndi woposa maola 15000-20000; ngati avareji ndi 30Km/H, imatha kukhala ndi 450000Km mu moyo wautumiki, ndipo moyo wa capacitor ndi wokwanira mtunda wa galimotoyo.

 

Ma capacitor a DC-LINK omwe amagwira ntchito bwino kwambiri ndi ma capacitor omwe amagwiritsa ntchito njira zatsopano zopangira ndi ukadaulo wa filimu yachitsulo. Amawonjezera mphamvu ya ma capacitor achikhalidwe a mafilimu, zomwe zikutanthauza kuti kukula kwa ma capacitor kumachepanso. Kumbali ina, imaphatikiza capacitor core ndi busbar kuti ikwaniritse zofunikira za kukula kwa makasitomala, zomwe sizimangopangitsa kuti inverter module yonse ikhale yaying'ono, komanso imachepetsa kwambiri inductance yosochera mu circuit yogwiritsira ntchito, zomwe zimapangitsa kuti magwiridwe antchito a circuit akhale olimba. Kapangidwe ka circuit komwe kamagwiritsidwa ntchito m'magalimoto amagetsi kali ndi magetsi ambiri, magetsi amphamvu kwambiri, magetsi ochulukirapo, magetsi obwerera m'mbuyo, magetsi amphamvu kwambiri, komanso zofunikira za moyo wautali. Ma capacitor a mafilimu mosakayikira ndi omwe amasankhidwa ndi magalimoto amagetsi ngati ma capacitor othandizira a DC.