1. Ua rau EMC thiab kev tiv thaiv
Nyob rau hauv high-speed brushless motors, EMC teeb meem feem ntau yog lub hom phiaj thiab qhov nyuaj ntawm tag nrho peb tes num, thiab cov txheej txheem optimization ntawm tag nrho EMC yuav siv sij hawm ntau heev. Yog li ntawd, peb yuav tsum raug lees paub tias yog vim li cas rau EMC tshaj tus qauv thiab cov txheej txheem optimization ua ntej.
EMC optimization feem ntau pib los ntawm peb cov lus qhia:
- Txhim kho qhov kev cuam tshuam
Nyob rau hauv kev tswj ntawm high-speed brushless motors, qhov tseem ceeb tshaj plaws ntawm kev cuam tshuam yog tsav Circuit Court tsim los ntawm kev hloov khoom siv xws li MOS thiab IGBT. Tsis muaj kev cuam tshuam rau kev ua haujlwm ntawm lub cev muaj zog ceev, txo qhov MCU cab kuj zaus, txo qhov kev sib hloov ceev ntawm lub raj hloov, thiab xaiv lub raj hloov nrog qhov tsis tsim nyog tuaj yeem txo EMC cuam tshuam.
- Txo txoj kev sib txuas ntawm qhov cuam tshuam
Optimizing PCBA routing thiab layout tuaj yeem txhim kho EMC, thiab kev sib txuas ntawm cov kab sib txuas yuav ua rau muaj kev cuam tshuam ntau dua. Tshwj xeeb tshaj yog rau high-frequency teeb liab kab, sim kom tsis txhob muaj cov kab sib sau ua voj voog thiab cov kab uas tsim cov kav hlau txais xov. Yog tias tsim nyog tuaj yeem ua kom cov txheej thaiv thaiv kom txo tau cov coupling.
- Txhais tau tias thaiv kev cuam tshuam
Feem ntau siv hauv kev txhim kho EMC yog ntau hom inductances thiab capacitors, thiab cov kev ntsuas tsim nyog raug xaiv rau kev cuam tshuam sib txawv. Y capacitor thiab hom hom inductance yog rau hom kev cuam tshuam, thiab X capacitor yog rau kev cuam tshuam hom sib txawv. Lub nplhaib sib nqus inductance kuj tau muab faib ua lub nplhaib sib nqus sib nqus thiab lub nplhaib sib nqus tsawg, thiab ob hom inductance yuav tsum tau ntxiv rau tib lub sijhawm thaum tsim nyog.
2. EMC optimization rooj plaub
Hauv EMC optimization ntawm 100,000-rpm brushless lub cev muaj zog ntawm peb lub tuam txhab, ntawm no yog qee cov ntsiab lus tseem ceeb uas kuv vam tias yuav pab tau rau txhua tus.
Txhawm rau ua kom lub cev muaj zog mus txog qhov kev kub ceev ntawm ib puas txhiab kiv puag ncig, thawj zaug cov cab kuj tau teem rau 40KHZ, uas yog ob zaug siab dua li lwm cov motors. Hauv qhov no, lwm txoj kev ua kom zoo tshaj plaws tsis tuaj yeem txhim kho EMC zoo. Qhov zaus raug txo mus rau 30KHZ thiab tus naj npawb ntawm MOS hloov lub sij hawm raug txo los ntawm 1/3 ua ntej muaj kev txhim kho tseem ceeb. Nyob rau tib lub sijhawm, nws tau pom tias Trr (rov qab lub sijhawm rov qab) ntawm qhov rov qab diode ntawm MOS muaj kev cuam tshuam rau EMC, thiab MOS nrog lub sijhawm rov qab nrawm dua raug xaiv. Cov ntaub ntawv xeem yog raws li qhia hauv daim duab hauv qab no. Cov npoo ntawm 500KHZ ~ 1MHZ tau nce li ntawm 3dB thiab cov kab nrib pleb tau raug flattened:
Vim qhov tshwj xeeb layout ntawm PCBA, muaj ob lub high-voltage fais fab kab uas yuav tsum tau bundled nrog rau lwm cov teeb liab kab. Tom qab lub high-voltage kab hloov mus rau ib tug twisted khub, kev sib nrig sib cuam tshuam ntawm cov leads yog ntau me me. Cov ntaub ntawv xeem yog raws li qhia hauv daim duab hauv qab no, thiab 24MHZ npoo tau nce li ntawm 3dB:
Nyob rau hauv cov ntaub ntawv no, ob hom inductors yog siv, ib tug ntawm uas yog ib tug tsawg zaus sib nqus nplhaib, nrog ib tug inductance ntawm txog 50mH, uas ho txhim kho EMC nyob rau hauv ntau yam ntawm 500KHZ ~ 2MHZ. Lwm qhov yog lub nplhaib sib nqus sib nqus siab, nrog rau qhov inductance ntawm 60uH, uas ua kom zoo dua EMC hauv thaj tsam ntawm 30MHZ ~ 50MHZ.
Cov ntaub ntawv xeem ntawm lub nplhaib sib nqus qis yog qhia hauv daim duab hauv qab no, thiab tag nrho cov npoo tau nce los ntawm 2dB hauv thaj tsam ntawm 300KHZ ~ 30MHZ:
Cov ntaub ntawv xeem ntawm lub nplhaib sib nqus sib nqus tau pom nyob rau hauv daim duab hauv qab no, thiab cov npoo tau nce ntau dua 10dB:
Kuv vam tias txhua tus tuaj yeem sib pauv tswv yim thiab tawm tswv yim ntawm EMC optimization, thiab nrhiav kev daws teeb meem zoo tshaj plaws hauv kev sim txuas ntxiv.
Post lub sij hawm: Jun-07-2023