ʻO ka Hall effect sensor a i ʻole Hall effect transducer kahi mea i hoʻohui ʻia e pili ana i ka hopena Hall a i haku ʻia me ka mea Hall a me kāna kaapuni kōkua. Hoʻohana nui ʻia ka Hall sensor i ka hana ʻoihana, ka lawe ʻana a me ke ola o kēlā me kēia lā. Mai ka hale o loko o ka hale ʻike, a i ʻole ke kaʻina hana, e ʻike ʻoe i kamagnet mauhe mahele hana nui. No ke aha e koi ʻia ai nā magnet mau loa no nā mea ʻike Hall?
ʻO ka mea mua, e hoʻomaka mai ke kumu hana o Hall sensor, Hall Effect. ʻO Hall Effect kahi ʻano o ka hopena electromagnetic, i ʻike ʻia e ka physicist ʻAmelika Edwin Herbert Hall (1855-1938) i ka makahiki 1879 i ka wā e aʻo ana i ka hana conductive o nā metala. Ke hele ke au i ka conductor perpendicular to external magnetic field, hoʻohuli ʻia ka mea lawe, a e hoʻokumu ʻia kahi māla uila hou e pili pono ana i ke kuhikuhi o ke kahua o kēia manawa a me ke kahua magnetic, e hopena i kahi ʻokoʻa ma nā kihi ʻelua o ka conductor. ʻO kēia hanana ʻo Hall effect, ka mea i kapa ʻia ʻo Hall potential difference.
ʻO ka hopena Hall ʻo ia ka deflection o ka neʻe ʻana i nā ʻāpana i hoʻoili ʻia e ka ikaika Lorentz i ke kahua magnetic. Ke hoʻopaʻa ʻia nā ʻāpana i hoʻopaʻa ʻia (electrons a i ʻole nā lua) i loko o nā mea paʻa, alakaʻi kēia deflection i ka hōʻiliʻili ʻana o nā kumukūʻai maikaʻi a maikaʻi ʻole i ke ala e kū pono ana i ke kahua o kēia manawa a me ke kahua magnetic, no laila e hana ai i kahi kahua uila transverse hou.
Ua ʻike mākou i ka neʻe ʻana o nā electrons i kahi māla magnetic, e hoʻopilikia ʻia lākou e ka ikaika Lorentz. E like me luna, e nānā mua kākou i ke kiʻi ma ka hema. I ka neʻe ʻana o ka electron i luna, e neʻe i lalo ka mea i hana ʻia e ia. ʻAe, e hoʻohana kākou i ka lula lima hema, e ʻae i ka laina ʻike makamaka o ke kahua mākēneki B (pana i ka pale) e komo i loko o ka poho lima, ʻo ia hoʻi, aia ka poho lima i waho, a kuhikuhi i nā manamana ʻehā i ka ʻo ka ʻaoʻao o kēia manawa, ʻo ia hoʻi, ʻehā mau kiko i lalo. A laila, ʻo ke kuhikuhi o ka manamana nui ke kuhikuhi ikaika o ka electron. Hoʻokuʻu ʻia nā electrons i ka ʻākau, no laila e piʻi ka hoʻopiʻi ma ka pā lahilahi i kekahi ʻaoʻao ma lalo o ka hana o ke kahua magnetic waho. Inā hili ka electron i ka ʻākau, e hana ʻia kahi ʻokoʻa ma ka ʻaoʻao hema a me ka ʻaoʻao ʻākau. E like me ka mea i hōʻike ʻia ma ke kiʻi ma ka ʻākau, inā pili ka voltmeter i ka ʻaoʻao hema a me ka ʻaoʻao ʻākau, e ʻike ʻia ka volta. ʻO kēia ke kumu kumu o ka hoʻokomo hale. Ua kapa ʻia ka volta i ʻike ʻia i ka hall induced voltage. Inā hoʻoneʻe ʻia ke kahua magnetic waho, nalowale ka volta Hall. Inā hōʻike ʻia e kahi kiʻi, ua like ka hopena Hall me kēia kiʻi:
i: ka ʻaoʻao o kēia manawa, B: ka ʻaoʻao o ke kahua mākēneki o waho, V: ʻO ka volta Hall, a ʻo nā kiko liʻiliʻi i loko o ka pahu hiki ke manaʻo ʻia he electrons.
Mai ke kumu hana o Hall sensor, hiki ke ʻike ʻia ʻo Hall effect sensor kahi mea ʻike ikaika, pono e koi i ka lako mana waho a me ke kahua magnetic e hana. Ke noʻonoʻo nei i nā koi o ka liʻiliʻi liʻiliʻi, ke kaumaha māmā, ka hoʻohana haʻahaʻa haʻahaʻa a me ka hoʻohana maʻalahi i ka noi ʻana o ka sensor, hoʻohana ʻia kahi magnet paʻa maʻalahi ma mua o kahi electromagnet paʻakikī e hoʻolako i ke kahua magnetic waho. Eia kekahi, i nā ʻano nui ʻehā o nā magnet mau loa,SmCoaNdFeB honua laha oleLoaʻa i nā magnets nā mea maikaʻi e like me nā waiwai magnetic kiʻekiʻe a me ke kūpaʻa hana paʻa, hiki ke hiki i ka hana kiʻekiʻe Hall effect transducer a i ʻole sensor ke hiki i ka pololei, sensitivity, a me nā ana hilinaʻi. No laila, hoʻohana ʻo NdFeB a me SmCo e like meNā mākēneki transducer hopena Hall.
Ka manawa hoʻouna: Sep-10-2021