Waiwai Kūʻai Kūʻē Kole RT (Ω)
E pili ana ka RT i ka waiwai kū'ē i ana ʻia ma kahi wela kikoʻī T me ka hoʻohana ʻana i ka mana ana i hoʻololi ʻole ʻia i ka waiwai kūʻē e pili ana i ka nui o ke ana ʻana.
ʻO ka pilina ma waena o ka waiwai kū'ē a me ka hoʻololi wela o nā mea uila penei:
RT = RN expB(1/T – 1/TN)
RT: NTC thermistor kū'ē i ka wela T (K).
RN: NTC thermistor kū'ē i helu 'ia wela TN (K).
T: Ka wela i koho ʻia (K).
B: Mea mau o ka thermistor NTC, ʻike ʻia hoʻi ʻo ka helu helu ʻike wela.
exp: exponent ma muli o ka helu maoli e (e = 2.71828…) .
He empirical ka pilina a loaʻa i kahi degere o ka pololei wale nō i loko o kahi palena palena o ka mahana i helu ʻia TN a i ʻole ka pale ʻana i koho ʻia RN, no ka mea, ʻo ka mea maʻamau B ʻo ia ka hana o ka wela T.
Hoʻohālikelike ʻia ʻo Zero Power Resistance R25 (Ω)
Wahi a ke kūlana aupuni, ʻo ka helu ʻana i ka waiwai kūʻē i ka mana ʻo R25 i ana ʻia e ka thermistor NTC ma ka mahana kuhikuhi o 25 ℃.ʻO kēia waiwai kū'ē ka waiwai kū'ē nominal o ka thermistor NTC.ʻO ka mea maʻamau i ʻōlelo ʻia NTC thermistor pehea ka nui o ke kūʻē ʻana, pili pū i ka waiwai.
Maikaʻi mau (helu helu ʻike wela) waiwai B (K)
Ua wehewehe ʻia nā waiwai B penei:
RT1: ʻAʻohe mana kū i ka wela T1 (K).
RT2: Kole mana kū'ē waiwai ma ka wela T2 (K).
T1, T2: ʻElua mau mahana i koho ʻia (K).
No nā thermistors NTC maʻamau, helu ʻia ka waiwai B mai 2000K a i 6000K.
Koe Mana Kū'ē Kū'ē Kūlana (αT)
ʻO ka lakio o ka hoʻololi pili ʻana i ke kūpaʻa ʻole-mana o kahi thermistor NTC ma kahi mahana i ʻōlelo ʻia i ka hoʻololi ʻana i ka wela e hoʻololi ai.
αT: ʻaʻohe mana pale ʻana i ke ana wela ma ka wela T (K).
RT: Zero mana kū'ē waiwai ma ka wela T (K).
T: Mahana (T).
B: Mea mau.
Ka helu hoʻopau (δ)
Ma kahi mahana ambient i ʻōlelo ʻia, ʻo ka dissipation coefficient o NTC thermistor ka lākiō o ka mana i hoʻokuʻu ʻia i ka resistor i ka hoʻololi ʻana o ka wela o ka resistor.
δ : ka huina hoopau o NTC thermistor, (mW/K).
△ P: Ka mana i hoʻopau ʻia e NTC thermistor (mW).
△ T: Hoʻopau ka thermistor NTC i ka mana △ P, ka hoʻololi like ʻana o ka mahana o ke kino pale (K).
ʻO ka manawa wela o nā mea uila (τ)
Ma lalo o nā kūlana mana zero, ke hoʻololi koke ka mahana, hoʻololi ka mahana wela i ka manawa i koi ʻia no 63.2% o nā ʻokoʻa wela mua ʻelua.ʻO ka manawa maʻamau e like me ka hiki ke wela o ka thermistor NTC a me ka hoʻohālikelike ʻana i kona koena dissipation.
τ : mau manawa wela (S).
C: Heat hiki o NTC thermistor.
δ : ka huina hoopau o NTC thermistor.
Ka mana helu Pn
ʻO ka hoʻohana mana ʻae ʻia o kahi thermistor i ka hana mau no ka manawa lōʻihi ma lalo o nā kūlana ʻenehana.Ma lalo o kēia mana, ʻaʻole i ʻoi aku ka mahana o ke kino kūpaʻa ma mua o kona wela hana kiʻekiʻe.
ʻO ka wela hana kiʻekiʻeTmax: ka wela kiʻekiʻe e hiki ai i ka thermistor ke hana mau no ka manawa lōʻihi ma lalo o nā kūlana ʻenehana.ʻO ia hoʻi, T0- Ambient wela.
ʻO nā mea uila e ana i ka mana Pm
Ma ka wela ambient i kuhikuhi ʻia, hiki ke nānā ʻole ʻia ka waiwai kūʻē o ke kino kūpaʻa i hoʻomehana ʻia e ke ana o kēia manawa e pili ana i ka nui o ke ana hewa.ʻOi aku ka nui o ka hoʻololi ʻana i ka waiwai kū'ē ma mua o 0.1%.
Ka manawa hoʻouna: Mar-29-2023