1. Izimbangela ze-EMC nezinyathelo zokuzivikela
Kumamotho anesivinini esikhulu samabhulashi, izinkinga ze-EMC zivame ukugxila kanye nobunzima bayo yonke iphrojekthi, futhi inqubo yokwenza kahle ye-EMC yonke ithatha isikhathi esiningi.Ngakho-ke, sidinga ukubona kahle izimbangela ze-EMC ukweqa izinga kanye nezindlela ezihambisanayo zokwenza kahle kuqala.
Ukulungiselelwa kwe-EMC ngokuyinhloko kuqala kusuka ezinhlangothini ezintathu:
- Thuthukisa umthombo wokuphazamiseka
Ekulawulweni kwamamotho e-brushless anesivinini esikhulu, umthombo obaluleke kakhulu wokuphazamiseka yisekethe yedrayivu eyakhiwe ngamadivayisi ashintshayo afana ne-MOS ne-IGBT.Ngaphandle kokuphazamisa ukusebenza kwemoto enesivinini esikhulu, ukunciphisa imvamisa yenkampani yenethiwekhi ye-MCU, ukunciphisa isivinini sokushintsha kweshubhu yokushintsha, nokukhetha ishubhu yokushintsha enemingcele efanele kunganciphisa ngempumelelo ukuphazamiseka kwe-EMC.
- Ukunciphisa indlela yokuhlanganisa yomthombo wokuphazamiseka
Ukuthuthukisa umzila nesakhiwo se-PCBA kungathuthukisa ngempumelelo i-EMC, futhi ukuhlanganisa imigqa komunye nomunye kuzodala ukuphazamiseka okukhulu.Ikakhulukazi kolayini besiginali yefrikhwensi ephezulu, zama ukugwema iminonjana eyenza amaluphu kanye nemikhondo eyenza izimpondo.Uma kunesidingo kungandisa ungqimba oluvikelayo ukuze kuncishiswe ukuhlangana.
- Izindlela zokuvimbela ukuphazamiseka
Okuvame ukusetshenziswa kakhulu ekuthuthukisweni kwe-EMC izinhlobo ezahlukahlukene zama-inductance nama-capacitor, futhi imingcele efanelekile ikhethelwa ukuphazamiseka okuhlukile.I-Y capacitor kanye ne-conductance mode evamile okokugxambukela kwemodi evamile, futhi i-X capacitor ingeyokuphazamiseka kwemodi ehlukile.Indandatho kazibuthe ye-inductance iphinde ihlukaniswe yaba indandatho kazibuthe eyimvamisa ephezulu kanye nendandatho kazibuthe eyimvamisa ephansi, futhi izinhlobo ezimbili zama-inductance zidinga ukwengezwa ngesikhathi esifanayo uma kudingeka.
2. Ikesi lokuthuthukisa i-EMC
Ekwenzeni i-EMC ye-brushless motor engu-100,000-rpm yenkampani yethu, nanka amaphuzu abalulekile engithemba ukuthi azoba usizo kuwo wonke umuntu.
Ukuze wenze injini ifinyelele isivinini esikhulu sokuguquguquka kwezinkulungwane eziyikhulu, imvamisa yenkampani yenethiwekhi isethelwe ku-40KHZ, ephakeme ngokuphindwe kabili kunezinye izinjini.Kulokhu, ezinye izindlela zokwenza kahle azikwazanga ukuthuthukisa ngempumelelo i-EMC.Imvamisa yehliswa ibe ngu-30KHZ futhi inani lezikhathi zokushintshwa kwe-MOS lincishiswa ngo-1/3 ngaphambi kokuba kube nokuthuthuka okukhulu.Ngesikhathi esifanayo, kwatholakala ukuthi i-Trr (isikhathi sokubuyisela emuva) ye-diode ehlanekezelwe ye-MOS inomthelela ku-EMC, futhi i-MOS enesikhathi sokubuyisela emuva esheshayo ikhethiwe.Idatha yokuhlola injengoba kukhonjisiwe esithombeni esingezansi.Imajini ka-500KHZ~1MHZ ikhuphuke cishe ngo-3dB futhi i-spike waveform yenziwe isicaba:
Ngenxa yesakhiwo esikhethekile se-PCBA, kukhona izintambo ezimbili zamandla kagesi aphezulu okudingeka zihlanganiswe nezinye izintambo zesignali.Ngemuva kokuthi umugqa we-high-voltage ushintshiwe ube yipheya esontekile, ukuphazanyiswa phakathi kwemikhondo kuncane kakhulu.Idatha yokuhlola injengoba kukhonjisiwe esithombeni esingezansi, futhi imajini engu-24MHZ ikhuphuke cishe ngo-3dB:
Kulokhu, kusetshenziswa ama-inductors emodi evamile, eyodwa yawo iyiringi kazibuthe enemvamisa ephansi, ene-inductance engaba ngu-50mH, ethuthukisa kakhulu i-EMC ebangeni lika-500KHZ~2MHZ.Enye iyindandatho kazibuthe enemvamisa ephezulu, ene-inductance engaba ngu-60uH, ethuthukisa kakhulu i-EMC ebangeni elingu-30MHZ~50MHZ.
Idatha yokuhlola yeringi kazibuthe yefrikhwensi ephansi iboniswa kumfanekiso ongezansi, futhi umkhawulo usuwonke ukhushulwa ngo-2dB ebangeni lika-300KHZ~30MHZ:
Idatha yokuhlola yeringi kazibuthe yemvamisa ephezulu iboniswa esithombeni esingezansi, futhi umkhawulo ukhushulwa ngaphezu kuka-10dB:
Ngethemba ukuthi wonke umuntu angashintshana ngemibono futhi axoxisane ngokulungiswa kwe-EMC, futhi athole isisombululo esingcono kakhulu ekuhloleni okuqhubekayo.
Isikhathi sokuthumela: Jun-07-2023