1. Izizathu ze-EMC kunye namanyathelo okukhusela
Kwiimoto ezihamba ngesantya esiphezulu, iingxaki ze-EMC zihlala zijolisa kunye nobunzima beprojekthi iyonke, kwaye inkqubo yokuphucula yonke i-EMC ithatha ixesha elininzi. Ke ngoko, kufuneka sizazi ngokuchanekileyo izizathu ze-EMC eyogqitha umgangatho kunye neendlela ezihambelanayo zokuphucula kuqala.
Ukwenziwa kwe-EMC ikakhulu kuqala kumacala amathathu:
- Ukuphucula umthombo wokuphazamiseka
Kulawulo lweenjini ze-brushless ezinesantya esiphezulu, owona mthombo ubalulekileyo wokuphazamiseka yisekethe ye-drive eyenziwe ngezixhobo zokutshintsha ezifana ne-MOS kunye ne-IGBT. Ngaphandle kokuchaphazela ukusebenza kwe-motor-speed-speed motor, ukunciphisa i-MCU carrier frequency, ukunciphisa isantya sokutshintsha ityhubhu yokutshintsha, kunye nokukhetha ityhubhu yokutshintsha kunye neeparitha ezifanelekileyo kunokunciphisa ngokufanelekileyo ukuphazamiseka kwe-EMC.
- Ukunciphisa indlela yokudibanisa yomthombo wokuphazamiseka
Ukuphucula indlela ye-PCBA kunye noyilo kunokuphucula ngokufanelekileyo i-EMC, kwaye ukudityaniswa kwemigca enye kwenye kuya kubangela ukuphazamiseka okukhulu. Ngokukodwa kwimigca yesignali ye-high-frequency, zama ukuphepha imikhondo eyenza i-loops kunye nemigca eyenza i-eriyali. Ukuba kuyimfuneko kunokunyusa umgangatho wokukhusela ukunciphisa ukudibanisa.
- Iindlela zokuthintela ukuphazamiseka
Eyona nto isetyenziswa ngokuqhelekileyo ekuphuculweni kwe-EMC ziindidi ezahlukahlukeneyo ze-inductances kunye ne-capacitors, kwaye iiparamitha ezifanelekileyo zikhethelwe ukuphazamiseka okuhlukeneyo. I-Y capacitor kunye ne-common mode inductance yeyokuphazamiseka kwemowudi eqhelekileyo, kunye ne-X capacitor yokuphazamiseka kwemodi yokwahlukana. Iringi yemagnethi yokufakelwa kwakhona yahlulwe yaba yiringi yemagnethi ephezulu kunye neringi yemagnethi ephantsi, kunye neentlobo ezimbini ze-inductances kufuneka zongezwe ngexesha elinye xa kukho imfuneko.
2. Ityala lokuphucula i-EMC
Kulungiselelo lwe-EMC lwe-100,000-rpm brushless motor yenkampani yethu, nanga amanqaku aphambili endithemba ukuba aya kuba luncedo kuye wonke umntu.
Ukuze wenze injini ifikelele kwisantya esiphezulu sekhulu lamawaka eenguquko, i-frequency ye-carrier carrier isetelwe kwi-40KHZ, ephindwe kabini ngaphezu kwezinye iinjini. Kule meko, ezinye iindlela zokuphucula azikwazanga ukuphucula ngokufanelekileyo i-EMC. I-frequency iyancipha ukuya kwi-30KHZ kwaye inani lamaxesha okutshintsha kwe-MOS lincitshiswe nge-1/3 ngaphambi kokuba kubekho uphuculo olubalulekileyo. Ngelo xesha, kwafunyaniswa ukuba i-Trr (ixesha lokubuyisela umva) ye-diode e-reverse ye-MOS inempembelelo kwi-EMC, kwaye i-MOS enexesha elikhawulezayo lokubuyisela ikhethiwe. Idatha yovavanyo njengoko kubonisiwe kumzobo ongezantsi. Umda we-500KHZ~1MHZ unyuke malunga ne-3dB kwaye i-spike waveform yenziwe yacaba:
Ngenxa yoyilo olukhethekileyo lwePCBA, kukho iintambo ezimbini zamandla ombane aphezulu ekufuneka zidityaniswe nezinye iilayini zomqondiso. Emva kokuba umgca we-high-voltage utshintshwe kwibini ephothiweyo, ukuphazamiseka phakathi kweenkokeli kuncinci kakhulu. Idatha yovavanyo njengoko kubonisiwe kumzobo ongezantsi, kwaye umda we-24MHZ unyuke malunga ne-3dB:
Kule meko, ii-inductors ezimbini eziqhelekileyo zisetyenzisiweyo, enye yazo yindandatho yamagnetic ephantsi, kunye ne-inductance malunga ne-50mH, ephucula kakhulu i-EMC kuluhlu lwe-500KHZ ~ 2MHZ. Enye i-ring-frequency magnetic ring, kunye ne-inductance malunga ne-60uH, ephucula kakhulu i-EMC kuluhlu lwe-30MHZ ~ 50MHZ.
Idatha yovavanyo yeringi yemagnethi ephantsi-ifrikhwensi iboniswe kumzobo ongezantsi, kwaye umda uwonke unyuswe nge-2dB kuluhlu lwe-300KHZ~30MHZ:
Idatha yovavanyo yeringi yemagnethi ephezulu iboniswe kumzobo ongezantsi, kwaye umda wongezwa ngaphezu kwe-10dB:
Ndiyathemba ukuba wonke umntu angatshintshiselana ngezimvo kwaye abambe ngentloko malunga nokulungiswa kwe-EMC, kwaye afumane esona sisombululo kuvavanyo oluqhubekayo.
Ixesha lokuposa: Jun-07-2023