EMC OPTIMIZATION YEMHOTARI YEHAKUMHUKA BRUSHLESS

1. Zvikonzero zveEMC uye matanho ekudzivirira

Mune yakakwirira-kumhanya brushless motors, EMC matambudziko anowanzo kutarisisa uye kuoma kweprojekiti yese, uye maitiro ekugadzirisa eEMC yese anotora nguva yakawanda.Naizvozvo, isu tinofanirwa kuziva nemazvo zvikonzero zveEMC kudarika chiyero uye inoenderana nzira dzekugadzirisa kutanga.

EMC optimization inonyanya kutangira kubva kumativi matatu:

• Vandudza panobva kupindira

Mukutonga kwema-high-speed brushless motors, chinonyanya kukosha chekuvhiringidza idhiraivha yedhiraivha inoumbwa nemagetsi ekuchinja akadai seMOS neIGBT.Pasina kukanganisa kushanda kweyakakwira-kumhanya mota, kudzikisa iyo MCU inotakura frequency, kudzikisa kukurumidza kwekuchinja kwechubhu yekuchinja, uye kusarudza chubhu yekuchinja ine maparamendi akakodzera kunogona kunyatso kudzikisa kukanganiswa kweEMC.

• Kuderedza nzira yekubatanidza yekukanganisa sosi

Kunatsiridza PCBA nzira uye dhizaini inogona kunyatso kuvandudza EMC, uye kubatanidza mitsara kune mumwe nemumwe kunokonzeresa kukanganisa kukuru.Kunyanya kune yakakwira-frequency masaini mitsara, edza kunzvenga mitsetse inogadzira zvishwe uye mitsetse inogadzira antenna.Kana zvichidikanwa inogona kuwedzera shielding layer kuti ideredze kubatana.

• Nzira dzekuvhara kupindira

Iyo inonyanya kushandiswa mukuvandudza EMC mhando dzakasiyana dzema inductances uye capacitors, uye maparamita akakodzera anosarudzirwa kupindira kwakasiyana.Y capacitor uye yakajairika modhi inductance ndeye yakajairika modhi kupindira, uye X capacitor ndeyekusiyanisa maitiro kupindira.Iyo inductance magineti mhete yakakamurwa kuita yakakwira frequency magineti mhete uye yakaderera frequency magineti mhete, uye maviri marudzi einductance anoda kuwedzerwa panguva imwe chete kana zvichidikanwa.

2. EMC optimization kesi

MuEMC optimization ye100,000-rpm brushless mota yekambani yedu, heano mamwe mapoinzi akakosha andinovimba achabatsira kumunhu wese.

Kuti iite kuti mota isvike pakumhanya kwemazana ezviuru zvekuchinja, iyo yekutanga inotakura frequency inoiswa ku40KHZ, iyo yakapetwa kaviri kupfuura mamwe mota.Muchiitiko ichi, dzimwe nzira dzekugadzirisa hadzina kukwanisa kuvandudza EMC.Iyo frequency inoderedzwa kusvika 30KHZ uye nhamba yeMOS inochinja nguva inoderedzwa ne1/3 kusati kwave nekuvandudzwa kukuru.Panguva imwecheteyo, zvakaonekwa kuti Trr (reverse recovery time) ye reverse diode yeMOS ine simba paEMC, uye MOS ine nguva yakakurumidza yekudzorera yakasarudzwa.Iyo data yekuyedza inoratidzwa mumufananidzo uri pazasi.Muganho we500KHZ~1MHZ wakawedzera neinenge 3dB uye iyo spike waveform yakatsikiswa:

Nekuda kweiyo yakakosha marongerwo ePCBA, kune maviri epamusoro-voltage tambo dzemagetsi dzinoda kusungirirwa nemamwe mitsara yechiratidzo.Mushure mokunge mutsara we-high-voltage uchishandurwa kuva peya yakamonyoroka, kupindirana kwepakati pakati pevatungamiri kuduku zvikuru.Iyo data yebvunzo inoratidzwa pamufananidzo uri pazasi, uye iyo 24MHZ muganho wakawedzera neinenge 3dB:

Muchiitiko ichi, maviri akajairika-modhi inductors anoshandiswa, imwe yacho iri yakaderera-frequency magineti mhete, ine inductance inosvika 50mH, iyo inovandudza zvakanyanya EMC muhuwandu hwe500KHZ ~ 2MHZ.Imwe yacho ndeye high-frequency magnetic ring, ine inductance inenge 60uH, iyo inovandudza zvakanyanya EMC muhuwandu hwe30MHZ ~ 50MHZ.

Iyo data yekuyedza yeyakaderera-frequency magineti mhete inoratidzwa mumufananidzo uri pazasi, uye iyo margin yese inowedzerwa ne2dB muhuwandu hwe300KHZ~30MHZ:

Iyo data yekuyedza yeakakwira-frequency magineti mhete inoratidzwa mumufananidzo uri pazasi, uye margin inowedzerwa neinopfuura 10dB:

Ndinovimba munhu wese anogona kuchinjana maonero uye kufunga nezve EMC optimization, uye nekuwana yakanakisa mhinduro mukuenderera mberi kuyedza.