Cov ntsiab lus ua haujlwm hauv Kaw vs. Qhib Sib Nqus Circuits
Nyob rau hauv ib tug kaw sib nqus Circuit Court (xws li, ib tug hlau nplaum sandwiched ntawm steel yokes), lub permeance coefficient (Pc) yog siab, feem ntau 5-10. Cov hlau nplaum ua haujlwm nyob rau hauv cheeb tsam linear ntawm demagnetization nkhaus, deb ntawm lub hauv caug. Demagnetization txaus ntshai yog tsawg txawm tias kub siab.
Hauv qhov qhib Circuit Court (piv txwv li, ib qho hlau nplaum ib leeg hauv huab cua), Pc qis (0.1-0.5). Qhov chaw ua haujlwm nyob ze ntawm lub hauv caug. Txhua qhov chaw tawm tsam lossis qhov kub thiab txias tuaj yeem thawb nws mus rau qhov tsis tuaj yeem poob. Vim li no, cov khoom sib nqus sib nqus thiab cov cuab yeej tuav tau siv cov ncej steel kom nce Pc.
Hauv ib lub tshuab hlau nplaum tas mus li, cov hlau nplaum rotor muaj qhov sib txawv ntawm PC nyob ntawm rotor txoj hauj lwm thiab stator tam sim no. Thaum lub ncov load, demagnetizing teb los ntawm armature cov tshuaj tiv thaiv tuaj yeem txo cov Pc hauv zos hauv qab 1.0, tsim kom muaj kev pheej hmoo demagnetization ntawm cov hlau nplaum.
Simulating Local Demagnetization los ntawm Reverse Magnetic Fields
FEA software (piv txwv li, Ansys Maxwell, JMAG, Lub cev muaj zog-CAD) xam cov magnetic teb vector ntawm txhua qhov kawg ntawm cov hlau nplaum. Lub teb yog ces muab piv rau BH nkhaus ntawm kev khiav hauj lwm kub. Yog hais tias lub teb magnitude tshaj qhov intrinsic coercivity (Hcj) nyob rau ntawm qhov chaw, lub ntsiab yog xam demagnetized.
Peb simulate peb tej yam kev mob:
Rated load ntawm max ambient kub.
Tshaj dhau (2x lossis 3x ntsuas tam sim no) rau 10 vib nas this.
Stall condition (zero rotor speed, tag nrho voltage thov).
Cov ntaub ntawv pov thawj qhia pom feem pua ntawm demagnetization thoob plaws lub ntim hlau nplaum. Feem ntau, cov npoo thiab cov ces kaum yog qhov yooj yim tshaj plaws. Tau txais qhov pib:<5% demagnetization after 1000 cycles; <2% for automotive or aerospace applications.
Optimizing Chamfers thiab Thickness Ratios ntawm FEA Software
Geometric hloov kho tau txo qis kev pheej hmoo demagnetization. Ntxiv 0.5-1.5mm chamfer los yog lub vojvoog ntawm cov npoo hlau nplaum yuav txo qis hauv cheeb tsam hauv cheeb tsam. FEA tso cai rau iteration sai: ib tug engineer tuaj yeem ntsuas 20-30 chamfer variations nyob rau hauv ib hnub, qhov kev kuaj lub cev ntawm txhua iteration yuav siv sij hawm lub lis piam.
Thickness ratio (magnet thickness / air gap length) kuj cuam tshuam rau demagnetization. Rau ib lub cev muaj zog, nce hlau nplaum thickness ntawm 3 hli mus rau 4 hli nce Pc los ntawm 1.2 mus rau 1.6, txo demagnetization kev pheej hmoo los ntawm 40-50% ntawm tib qhov kev khiav hauj lwm kub. Txawm li cas los xij, cov hlau nplaum thicker nce rotor inertia thiab cov khoom siv. FEA optimizes thickness piv rau yam tsawg kawg nkaus tus nqi thaum nyob saum tus demagnetization pib.
Hla -Ua pov thawj cov txiaj ntsig Prototyping nrog cov ntaub ntawv suav
Tom qab FEA optimization, peb tsim cov qauv ntawm lub cev (5-10 daim) thiab ua cov demagnetization validation:
Ntsuas flux ntawm chav tsev kub (Helmholtz coil lossis fluxmeter).
Ua kom sov lub rooj sib txoos kom ua haujlwm siab tshaj plaws rau 1 teev.
Siv cov mem tes rov qab los yog khiav lub cev muaj zog ntawm overload.
Txias rau hauv chav tsev kub thiab rov- ntsuas flux.
Irreversible poob=(flux_after - flux_before) / flux_before × 100%. Kev sib raug zoo nrog FEA yuav tsum tsis pub dhau 10-15%. Yog tias tsis sib haum xeeb tshaj 20%, peb kho qhov kev simulation (xws li, ntxiv cov txiaj ntsig ntawm cov khoom siv sib txawv, kev tsim kev kam rau siab).
Rau kev cai sib nqus cov kev daws teeb meem xav tau FEA demagnetization tsom xam - suav nrog IPM rotors, hais- hom rotor hlau nplaum, thiab cov hlau nplaum sib nqus - thov xa mus rau peb qhov Finite Element Analysis technical support page ntawm peb lub vev xaib. Peb muab tag nrho simulation qhia nrog txhua tus qauv.
Txhawm rau thov qhov kev ntsuas kev pheej hmoo demagnetization rau koj qhov uas twb muaj lawm lossis npaj tsim lub cev muaj zog, hu rau peb pab pawg FEA engineering. Xa koj cov stator tam sim no waveform, rotor qhov ntev, qib hlau nplaum, thiab max kub. Peb xa rov qab daim ntawv qhia simulation hauv 3-5 hnub ua haujlwm.
Cov lus nug nquag
Q: FEA yog qhov tseeb npaum li cas hauv kev kwv yees demagnetization piv rau -kev ntsuas lub ntiaj teb lub cev muaj zog?
A: Tsis pub dhau ± 10% rau homogenous hlau nplaum. Variation los ntawm qhov tseeb hlau nplaum Hcj batch- mus rau -batch (± 5%) thiab qhov ntsuas kub yuam kev. Peb pom zoo kom muaj kev nyab xeeb ntawm 15% qis dua qhov ntsuas Hcj.
Q: Koj puas tuaj yeem simulate demagnetization rau Halbach array sib dhos?
A: Yog. Halbach arrays muaj txoj hauv kev yooj yim, tab sis FEA tswj lawv kom raug. Peb tshwj xeeb hauv Halbach configurations rau linear motors thiab MRI gradient coils.
Q: Dab tsi yog qhov tsawg kawg nkaus hlau nplaum tuab kom tsis txhob demagnetization hauv 150℃PMSM?
A: Nyob ntawm huab cua sib txawv thiab stator tam sim no. Raws li txoj cai ntawm tus ntiv tes xoo rau saum npoo -mount PMSM nrog 1mm huab cua sib txawv thiab N35SH hlau nplaum, qhov tsawg kawg nkaus thickness yog 3.5mm. Rau N42SH, 4.5mm. Khiav FEA rau koj qhov geometry tseeb.
