Yuav ua li cas txo qhov poob ntawm inductor core | TAU TXAIS

Peb paub tias inductance core yog cov khoom lag luam uas yuav siv ntau yam khoom siv hluav taws xob, cov khoom siv hluav taws xob yuav ua rau qee qhov poob hauv cov txheej txheem siv, thiab cov tub ntxhais inductance tsis muaj qhov tshwj xeeb. Yog tias qhov poob ntawm cov tub ntxhais inductor loj dhau lawm, nws yuav cuam tshuam rau lub neej kev pabcuam ntawm cov tub ntxhais inductor.

Cov yam ntxwv ntawm inductor core poob (tsuas yog suav nrog hysteresis poob thiab eddy tam sim no poob) yog ib qho tseem ceeb ntawm cov khoom siv hluav taws xob, uas cuam tshuam thiab txawm tias txiav txim siab ua haujlwm zoo, kub nce thiab kev ntseeg siab ntawm tag nrho lub tshuab.

Inductor core poob

1. Hysteresis poob

Thaum cov khoom tseem ceeb yog magnetized, muaj ob feem ntawm lub zog xa mus rau lub magnetic teb, ib tug ntawm uas yog hloov dua siab tshiab rau hauv lub peev xwm zog, uas yog, thaum lub sab nraud magnetization tam sim no raug tshem tawm, lub magnetic teb zog yuav rov qab mus rau lub Circuit Court. , thaum lwm qhov yog noj los ntawm kev sib txhuam, uas yog hu ua hysteresis poob.

Lub cheeb tsam ntawm tus duab ntxoov ntxoo ib feem ntawm lub magnetization nkhaus sawv cev rau lub zog poob los ntawm hysteresis nyob rau hauv lub magnetization txheej txheem ntawm cov hlau nplaum core nyob rau hauv ib tug ua hauj lwm voj voog. Qhov tsis muaj kev cuam tshuam rau qhov poob yog qhov siab tshaj plaws ua haujlwm sib nqus flux ceev B, qhov siab tshaj plaws magnetic teb siv H, remanence Br thiab coercive force Hc, nyob rau hauv uas sib nqus flux ceev thiab magnetic teb zog nyob ntawm seb lub sab nraud hluav taws xob teb tej yam kev mob thiab lub core size parameters, thaum Br thiab Hc nyob ntawm cov khoom siv. Rau txhua lub sij hawm ntawm magnetization ntawm cov tub ntxhais inductor, nws yog ib qhov tsim nyog yuav tau poob lub zog proportional rau cheeb tsam ncig los ntawm hysteresis voj. Qhov siab dua qhov zaus, qhov ntau dua qhov poob lub zog yog, qhov loj dua qhov sib nqus induction viav vias yog, qhov loj dua qhov chaw kaw, qhov ntau dua qhov hysteresis poob.

2. Eddy tam sim no poob

Thaum AC voltage ntxiv rau hauv cov tub ntxhais hlau nplaum, qhov kev tawm dag zog tam sim no ntws los ntawm lub kauj, thiab tag nrho cov hlau nplaum sib nqus ua los ntawm qhov zoo siab ampere tig dhau los ntawm cov tub ntxhais hlau nplaum. Cov tub ntxhais hlau nplaum nws tus kheej yog tus neeg xyuas pib, thiab tag nrho cov sib nqus flux nyob ib puag ncig ntawm qhov chaw sib nqus ntawm cov tub ntxhais sib nqus yog txuas los ua ib qho kev hloov pauv thib ob. Vim tias qhov kev tiv thaiv ntawm cov khoom siv hlau nplaum tsis muaj qhov kawg, muaj qee qhov kev tiv thaiv nyob ib puag ncig ntawm cov tub ntxhais, thiab qhov induced voltage ua rau tam sim no, uas yog, eddy tam sim no, uas ntws los ntawm qhov tsis kam, ua rau poob, uas yog, eddy tam sim no poob.

3. Kev poob qis

Qhov seem poob yog tshwm sim los ntawm magnetization so los yog magnetic hysteresis nyhuv. Qhov kev so hu ua kev so txhais tau hais tias nyob rau hauv cov txheej txheem ntawm magnetization los yog anti-magnetization, lub xeev magnetization tsis tam sim ntawd hloov mus rau nws lub xeev kawg nrog rau kev hloov ntawm magnetization siv, tab sis yuav tsum tau ib tug txheej txheem, thiab "lub sij hawm nyhuv" yog ua rau. qhov seem poob. Nws yog tsuas yog nyob rau hauv lub siab zaus 1MHz saum toj no ib co so poob thiab spin magnetic resonance thiab thiaj li nyob rau, nyob rau hauv lub switching fais fab mov 175,000 KHz ntawm lub hwj chim electronics, qhov kev faib ua feem ntawm residual poob yog tsawg heev, yuav tsum kwv yees li ignored.

Thaum xaiv ib tug haum sib nqus cores, txawv curves thiab zaus cov yam ntxwv yuav tsum tau txiav txim siab, vim hais tias tus nkhaus txiav txim siab lub siab zaus poob, saturation nkhaus thiab inductance ntawm inductor. Vim hais tias cov eddy tam sim no ntawm ib sab ua rau tsis kam tiv, ua rau cov khoom sib nqus kom sov, thiab ua rau cov excitation tam sim no nce, ntawm qhov tod tes, txo qhov zoo sib nqus conduction cheeb tsam ntawm cov hlau nplaum. Yog li ntawd, sim xaiv cov khoom sib nqus uas muaj kev tiv thaiv siab los yog hauv daim ntawv ntawm dov strip kom txo qis tam sim no poob. Yog li ntawd, cov khoom siv platinum tshiab NPH-L yog tsim rau cov hlau tsis muaj hlau hmoov cores ntawm ntau zaus thiab cov khoom siv hluav taws xob siab.

Cov tub ntxhais poob yog tshwm sim los ntawm kev sib nqus magnetic teb nyob rau hauv cov khoom tseem ceeb. Qhov poob tshwm sim los ntawm qee yam khoom siv yog qhov ua haujlwm ntawm kev khiav hauj lwm zaus thiab tag nrho cov flux viav vias, yog li txo qhov kev ua haujlwm zoo. Cov tub ntxhais poob yog tshwm sim los ntawm hysteresis, eddy tam sim no thiab residual poob ntawm cov khoom tseem ceeb. Yog li ntawd, qhov poob tseem ceeb yog qhov hysteresis poob, eddy tam sim no poob thiab remanence poob. Hysteresis poob yog lub zog poob los ntawm hysteresis, uas yog proportional rau thaj tsam ncig los ntawm hysteresis loops. Thaum cov hlau nplaum dhau los ntawm cov tub ntxhais hloov pauv, eddy tam sim no tshwm sim hauv cov tub ntxhais, thiab qhov poob los ntawm eddy tam sim no hu ua eddy tam sim no poob. Qhov seem poob yog tag nrho cov kev poob tsuas yog hysteresis poob thiab eddy tam sim no poob.