Motoci da yawan karamin zafi na gida suna bukata wani adadin karami mai yawa a lokacin mulkin haɗa daga lokacin da suke gudana saboda dalilai masu:
A lokacin mulki, motoci ya kamata ya tsaftace inertiyan da take da shi. Saboda haka, ana buƙatar karamin tsayi mai yawa don tsaftace ma'adancin haɗuwa da kuma sanya zuwa tasirin haɗuwar gudanar. Wannan muhimman yadda ya buƙata karamin tsayi mai yawa don bayyana karamin tsayi na mulki.
A lokacin mulki, ya kamata kara flux da ke motori daga zero. Yana nufin cewa ana buƙatar karamin tsayi mai yawa don kara sauran tsarin magnetic da ke bayyana karamin tsayi na mulki. Idan motoci bai faru aiki, za'a ci gaba flux, kuma karamin da ke buƙata ya ƙara.
Motoci da yawan karamin zafi na gida, a lokacin mulki, suna da karamin zafi kawai, wanda ba ta bi da tsarin magnetic mai haɗuwa. Don haɗe tsarin magnetic mai haɗuwa, ana amfani da kapasita, rizista, ko PTC (Positive Temperature Coefficient) thermistors a lokacin mulki. Waɗannan abubuwa sun bayyana farkon tsari a lokacin mulki, kuma suna buƙata karamin tsayi mai yawa.
Kowane da motoci ya kamata tsaftace inertiyan, ya kamata tsaftace hambabtar abincin da ya sake haɗa. Idan motoci ya haɗa da abinci masu miyali ko ma'adanci, ana buƙatar karamin tsayi mai yawa don tsaftace waɗannan hambabta, wanda yake buƙata karamin tsayi na mulki.
Waya na motoci suna da tatsuniyar indukti, wanda yana nufin cewa ƙarin da ke karamin tsayi suna haɓaka faden back EMF (counter-electromotive force) wanda yake haɓaka ƙarin da ke karamin tsayi. Amma a lokacin mulki, saboda motoci bai faru aiki, back EMF yana ƙara, kuma karamin tsayi ya faru a ƙarin mai yawa.
A lokacin mulki, motoci zai iya samun ƙarin da ta yi tsaye, wanda yake haɓaka ƙarin da ke waya. Amma a lokacin da motoci bai faru aiki, ba ta samu ƙarin da ya fiye, saboda haka, karamin tsayi zai iya faru zuwa ƙarin mai yawa.
Don ƙare motoci da yawan karamin zafi na gida daga lafiya da ƙarin da ke karamin tsayi na mulki, ana amfani da kapasita, rizista, ko PTC thermistors don haɗe lokacin mulki. Duk da haka, ana amfani da abubuwan ƙare da ƙarin (kamar thermal relays) don ƙare ƙarin da ke karamin tsayi na mulki daga lafiya ko lafiya da motoci.
Motoci da yawan karamin zafi na gida suna buƙata karamin tsayi mai yawa a lokacin mulki saboda hakan da suka buƙata tsaftace ma'adancin haɗuwa, kara tsarin magnetic, bayyana karamin tsayi na mulki, da kuma tsaftace hambabta masu aiki. Ta hanyar takamantaccen ƙarfafa da ƙare, yana iya ƙare motoci daga lafiya a lokacin mulki da kuma haɗa zuwa aikin gudanar daidai.