Umehluko omkhulu phakathi kwemoto enikwe amandla okuguqulwa kwemvamisa kanye nemoto enikwe amandla i-frequency sine wave ukuthi ngakolunye uhlangothi, isebenza ngebanga elibanzi lemvamisa kusukela emvamisa ephansi kuya emvamisa ephezulu, kanti ngakolunye uhlangothi, i-power waveform ayiyona i-sinusoidal. Ngokuhlaziya uchungechunge lwe-Fourier lwe-voltage waveform, i-power supply waveform iqukethe ama-harmonics angaphezu kwama-2N ngaphezu kwengxenye ye-fundamental wave (i-control wave) (inani lamagagasi okuguquguquka eliqukethwe engxenyeni ngayinye yegagasi lokulawula yi-N). Lapho i-SPWM AC converter ikhipha amandla futhi iwasebenzisa kumoto, i-current waveform kumoto izovela njengegagasi le-sine elinama-harmonics abekwe phezulu. I-harmonic current izokhiqiza i-pulsating magnetic flux component ku-magnetic circuit ye-asynchronous motor, kanti i-pulsating magnetic flux component ibekwe phezu kwe-main magnetic flux, ukuze i-main magnetic flux iqukethe i-pulsating magnetic flux component. I-pulsating magnetic flux component yenza ne-magnetic circuit ivame ukugcwala, okunemiphumela elandelayo ekusebenzeni kwemoto:
1. Kukhiqizwa i-pulsating magnetic flux
Ukulahlekelwa kuyanda kanye nokusebenza kahle kwehla. Ngenxa yokuthi umkhiqizo wokunikezwa kwamandla emvamisa eguquguqukayo uqukethe inani elikhulu lama-harmonics aphezulu, la ma-harmonics azokhiqiza ukusetshenziswa kwethusi nensimbi okuhambisanayo, kunciphisa ukusebenza kahle. Ngisho nobuchwepheshe be-SPWM sinusoidal pulse width, obusetshenziswa kabanzi njengamanje, buvimbela ama-harmonics aphansi kuphela futhi bunciphise i-torque yokushaya kwemoto, ngaleyo ndlela kwandise ububanzi bokusebenza obuzinzile bemoto ngesivinini esiphansi. Futhi ama-harmonics aphezulu awazange ehle nje kuphela, kodwa anda. Ngokuvamile, uma kuqhathaniswa nokunikezwa kwamandla emvamisa ye-sine, ukusebenza kahle kuncishiswa ngo-1% kuya ku-3%, kanti i-power factor incishiswa ngo-4% kuya ku-10%, ngakho-ke ukulahlekelwa kwe-harmonic kwemoto ngaphansi kokunikezwa kwamandla okuguqulwa kwemvamisa kuyinkinga enkulu.
b) Ukukhiqiza ukudlidliza nomsindo kagesi. Ngenxa yokuba khona kochungechunge lwama-harmonics aphezulu, kuzokhiqizwa ukudlidliza nomsindo kagesi. Indlela yokunciphisa ukudlidliza nomsindo kakade iyinkinga kuma-motor asebenzisa i-sine wave. Ku-motor esebenzisa i-inverter, inkinga iba yinkimbinkimbi kakhulu ngenxa yemvelo yokunikezwa kwamandla okungeyona i-sinusoidal.
c) I-torque eshaya ngamandla imvamisa ephansi yenzeka ngesivinini esiphansi. Amandla e-harmonic magnetomotive kanye nokuhlanganiswa kwamanje kwe-rotor harmonic, okuholela ku-torque eshaya ngamandla i-harmonic electromagnetic ehlala njalo kanye ne-torque eshaya ngamandla i-harmonic electromagnetic eshintshanayo, i-torque eshaya ngamandla i-harmonic electromagnetic eshintshanayo izokwenza i-motor pulsation, ngaleyo ndlela ithinte ukusebenza okuzinzile kwesivinini esiphansi. Ngisho noma kusetshenziswa imodi yokuguqulwa kwe-SPWM, uma kuqhathaniswa nokunikezwa kwamandla kwe-power frequency sine, kusazoba khona izinga elithile le-harmonics ehlelekile, ezokhiqiza i-torque eshaya ngamandla ngesivinini esiphansi futhi ithinte ukusebenza okuzinzile kwe-motor ngesivinini esiphansi.
2.Khiqiza i-voltage ye-impulse kanye ne-voltage ye-axial (yamanje) ekufakweni kwe-insulation
a) Kwenzeka i-voltage yokunyuka. Uma injini isebenza, i-voltage esetshenziswayo ivame ukufakwa i-voltage yokunyuka ekhiqizwayo lapho izingxenye ezikudivayisi yokuguqula imvamisa zishintshwa, futhi ngezinye izikhathi i-voltage yokunyuka iphezulu, okuholela ekushaqekeni kukagesi okuphindaphindiwe kwikhoyili kanye nomonakalo ku-insulation.
b) Khiqiza i-axial voltage kanye ne-axial current. Ukukhiqizwa kwe-shaft voltage kungenxa yokuthi kukhona ukungalingani kwesekethe yamagnetic kanye nesenzakalo sokungeniswa kwe-electrostatic, okungekubi kakhulu kuma-motor avamile, kodwa kugqame kakhulu kuma-motor asebenzisa amandla kagesi aguquguqukayo. Uma i-shaft voltage iphezulu kakhulu, isimo sokuthambisa sefilimu kawoyela phakathi kwe-shaft kanye ne-bearing sizolimala, futhi impilo yesevisi ye-bearing izofinyezwa.
c) Ukushabalalisa ukushisa kuthinta umphumela wokushabalalisa ukushisa lapho kusebenza ngesivinini esiphansi. Ngenxa yobubanzi obukhulu bokulawula isivinini semoto eguquguqukayo yemvamisa, ivame ukusebenza ngesivinini esiphansi ngemvamisa ephansi. Ngalesi sikhathi, ngoba isivinini siphansi kakhulu, umoya opholile ohlinzekwa yindlela yokupholisa ye-self-fan esetshenziswa yimoto evamile awanele, futhi umphumela wokushabalalisa ukushisa uyancipha, futhi ukupholisa kwefeni okuzimele kumele kusetshenziswe.
Ithonya lomshini livame ukuzwakala, ngokuvamile, noma iyiphi idivayisi yomshini izokhiqiza isenzakalo sokuzwakala. Kodwa-ke, injini esebenza ngemvamisa yamandla engaguquki kanye nesivinini kufanele igweme ukuzwakala ngemvamisa yemvelo yomshini yokusabela kwemvamisa kagesi engu-50Hz. Uma imoto isebenza ngokuguqulwa kwemvamisa, imvamisa yokusebenza inobubanzi obukhulu, futhi ingxenye ngayinye inomvamisa wayo wemvelo, okulula ukuyenza izwakale ngemvamisa ethile.
Isikhathi sokuthunyelwe: Feb-25-2025