UKWENZIWA KOMSEBENZI WE-EMC KWEMOTO ENGENABRUSH ESIZA PHEZULU

1. Izizathu ze-EMC kunye namanyathelo okukhusela

Kwiimoto ezingenamabhrashi akhawulezayo, iingxaki ze-EMC zihlala zizinto ezijongwayo kunye nobunzima beprojekthi yonke, kwaye inkqubo yokwenza ngcono i-EMC yonke ithatha ixesha elininzi. Ke ngoko, kufuneka siqale siqonde ngokuchanekileyo izizathu zokuba i-EMC idlule umgangatho kunye neendlela ezifanelekileyo zokulungisa.

Ukulungiswa kwe-EMC kuqala kwiindlela ezintathu:

• Phucula umthombo wokuphazamiseka

Kulawulo lweemoto ezingenamabhrashi akhawulezayo, umthombo obalulekileyo wokuphazamiseka yisekethe yokuqhuba eyenziwe zizixhobo zokutshintsha ezifana neMOS kunye ne-IGBT. Ngaphandle kokuchaphazela ukusebenza kwemoto ekhawulezayo, ukunciphisa imvamisa yokuthwala i-MCU, ukunciphisa isantya sokutshintsha kwetyhubhu yokutshintsha, kunye nokukhetha ityhubhu yokutshintsha eneeparamitha ezifanelekileyo kunokunciphisa ngempumelelo ukuphazamiseka kwe-EMC.

• Ukunciphisa indlela yokudibanisa yomthombo wokuphazamiseka

Ukuphucula indlela kunye noyilo lwe-PCBA kunokuphucula ngempumelelo i-EMC, kwaye ukudibana kwemigca omnye komnye kuya kubangela ukuphazamiseka okukhulu. Ingakumbi kwimigca yesignali ephindaphindayo, zama ukuphepha ii-traces ezenza ii-loops kunye nee-traces ezenza ii-antenna. Ukuba kuyimfuneko kunokunyusa umaleko wokukhusela ukunciphisa i-coupling.

• Iindlela zokuthintela ukuphazamiseka

Eyona isetyenziswa kakhulu ekuphuculeni i-EMC ziintlobo ezahlukeneyo ze-inductances kunye nee-capacitors, kwaye iiparameter ezifanelekileyo zikhethwa kwiingxaki ezahlukeneyo. I-Y capacitor kunye ne-common mode inductance zezokuphazamiseka kwemo eqhelekileyo, kwaye i-X capacitor yeyokuphazamiseka kwemo eyahlukileyo. I-inductance magnetic ring nayo yahlulwe yaba yi-high frequency magnetic ring kunye ne-low frequency magnetic ring, kwaye iintlobo ezimbini ze-inductances kufuneka zongezwe ngaxeshanye xa kuyimfuneko.

2. Ityala lokwenza ngcono i-EMC

Kwi-EMC optimization ye-100,000-rpm brushless motor yenkampani yethu, nazi ezinye izinto ezibalulekileyo endinethemba lokuba ziya kuba luncedo kuye wonke umntu.

Ukuze imoto ifikelele kwisantya esiphezulu seenguqu ezilikhulu lamawaka, isantya sokuqala sokuthwala simiselwe kwi-40KHZ, esiphindwe kabini kunezinye iimoto. Kule meko, ezinye iindlela zokwenza ngcono azikwazanga ukuphucula i-EMC ngempumelelo. Isantya sincitshiswa siye kwi-30KHZ kwaye inani lamaxesha okutshintsha i-MOS lincitshiswa nge-1/3 ngaphambi kokuba kubekho uphuculo olubonakalayo. Kwangaxeshanye, kufunyaniswe ukuba i-Trr (ixesha lokubuyisela elingasemva) ye-reverse diode ye-MOS inefuthe kwi-EMC, kwaye kukhethwe i-MOS enexesha lokubuyisela elikhawulezayo. Idatha yovavanyo injengoko ibonisiwe kumfanekiso ongezantsi. Umda we-500KHZ~1MHZ unyuke malunga ne-3dB kwaye i-spike waveform ithambekile:

Ngenxa yoyilo olukhethekileyo lwe-PCBA, kukho imigca emibini yamandla ene-voltage ephezulu ekufuneka ihlanganiswe neminye imigca yesignali. Emva kokuba umgca we-voltage ephezulu utshintshelwe kwisibini esijijekileyo, ukuphazamiseka okudibeneyo phakathi kwee-leads kuncinci kakhulu. Idatha yovavanyo injengoko ibonisiwe kumfanekiso ongezantsi, kwaye umda we-24MHZ unyuke malunga ne-3dB:

Kule meko, kusetyenziswa ii-inductors ezimbini ze-common-mode, enye yazo yiringi yemagnethi engaphantsi, ene-inductance emalunga ne-50mH, ephucula kakhulu i-EMC kuluhlu lwe-500KHZ~2MHZ. Enye yiringi yemagnethi engaphantsi, ene-inductance emalunga ne-60uH, ephucula kakhulu i-EMC kuluhlu lwe-30MHZ~50MHZ.

Idatha yovavanyo lweringi yemagnethi engaphantsi iboniswe kumfanekiso ongezantsi, kwaye umda uwonke unyuswe nge-2dB kuluhlu lwe-300KHZ ~ 30MHZ:

Idatha yovavanyo lweringi yemagnethi ephindaphindwayo iboniswe kumfanekiso ongezantsi, kwaye umda unyuswe ngaphezulu kwe-10dB:

Ndiyathemba ukuba wonke umntu angatshintshiselana ngezimvo aze acinge nzulu ngokulungiswa kwe-EMC, aze afumane isisombululo esingcono kuvavanyo oluqhubekayo.