Musiyano mukuru uripo pakati pemota inofambiswa nefrequency conversion power supply nemota inofambiswa nepower frequency sine wave ndewekuti kune rumwe rutivi, inoshanda muhuwandu hwakawanda hwema frequency kubva pa low frequency kusvika pa high frequency, uye kune rumwe rutivi, power waveform haisi sinusoidal. Kuburikidza neFourier series analysis ye voltage waveform, power supply waveform ine anopfuura 2N harmonics kuwedzera kune fundamental wave component (control wave) (huwandu hwema modulation waves huri muhafu yega yega ye control wave iN). Kana SPWM AC converter ikaburitsa simba uye ikarishandisa kumota, current waveform pamota ichaonekwa se sine wave ine superimposed harmonics. Harmonic current ichagadzira pulsating magnetic flux component mu magnetic circuit ye asynchronous motor, uye pulsating magnetic flux component inoiswa pamusoro pe main magnetic flux, kuitira kuti main magnetic flux ive ne pulsating magnetic flux component. pulsating magnetic flux component inoitawo kuti magnetic circuit ive yakazara, izvo zvine zvinotevera pakushanda kwemota:
1. Kuyerera kwemagineti kunoputika kunogadzirwa
Kurasikirwa kunowedzera uye kushanda zvakanaka kunoderera. Nekuti kubuda kwesimba revariable frequency kune huwandu hwakawanda hweharmonics dzepamusoro, harmonics idzi dzichagadzira kushandiswa kwemhangura nesimbi zvinoenderana, zvichideredza kushanda zvakanaka. Kunyangwe tekinoroji yeSPWM sinusoidal pulse width, iyo inoshandiswa zvakanyanya pari zvino, inongodzivisa harmonics dzakaderera uye inoderedza torque yemota, nokudaro ichiwedzera nzvimbo yakagadzikana yekushanda kwemota nekumhanya kwakaderera. Uye harmonics dzakakwirira hadzina kungoderera chete, asi dzakawedzera. Kazhinji, zvichienzaniswa nepower frequency sine power supply, kushanda zvakanaka kunoderedzwa ne1% kusvika 3%, uye power factor inoderedzwa ne4% kusvika 10%, saka kurasikirwa kweharmonic kwemota pasi pesimba rekushandura frequency idambudziko guru.
b) Kugadzira kutenderera kwemagetsi neruzha. Nekuda kwekuvapo kwema harmonics emhando yepamusoro, kutenderera kwemagetsi neruzha zvichagadzirwawo. Maitiro ekuderedza kutenderera neruzha atove dambudziko kuma motors anoshandisa sine wave. Kune mota inofambiswa ne inverter, dambudziko rinova rakaoma nekuda kwehunhu hwemagetsi husina sinusoidal.
c) Torque yakaderera yekurova inoitika nekumhanya kwakaderera. Harmonic magnetomotive force uye rotor harmonic current synthesis, zvichikonzera constant harmonic electromagnetic torque uye alternating harmonic electromagnetic torque, alternating harmonic electromagnetic torque ichaita kuti motor pulsation, nokudaro ichikanganisa kushanda kwe low speed. Kunyangwe kana SPWM modulation mode ikashandiswa, zvichienzaniswa ne power frequency sine power supply, pachave ne low-order harmonics, iyo ichagadzira pulsating torque nekumhanya kwakaderera uye ichikanganisa kushanda kwakasimba kwemota nekumhanya kwakaderera.
2. Gadzira voltage yekukurumidza uye voltage ye axial (yazvino) kune insulation
a) Kukwira kwemagetsi kunoitika. Kana mota ichishanda, magetsi anoshandiswa anowanzoiswa pamusoro pemagetsi anobuda kana zvikamu zviri mumudziyo wekushandura mafrequency zvachinjwa, uye dzimwe nguva magetsi anokwira zvakanyanya, zvichikonzera kuvhunduka kwemagetsi kakawanda pacoil uye kukuvara kwe insulation.
b) Kugadzira axial voltage uye axial current. Kugadzirwa kweshaft voltage kunonyanya kukonzerwa nekuvapo kwe magnetic circuit imbalance uye electrostatic induction phenomenon, iyo isiri yakanyanya kuipa mumamota akajairwa, asi inonyanya kuonekwa mumamota anofambiswa ne variable frequency power supply. Kana shaft voltage yakakwira zvakanyanya, mamiriro ekunyorovesa kwemafuta efirimu pakati peshaft nebearing achakuvadzwa, uye hupenyu hwebasa rebearing huchapfupikiswa.
c) Kupisa kunokanganisa kupisa kana kuchimhanya nekumhanya kwakaderera. Nekuda kwehukuru hwekudzora kumhanya kwemota inochinja-chinja, inowanzo mhanya nekumhanya kwakaderera pakufamba kwakaderera. Panguva ino, nekuti kumhanya kwacho kwakaderera kwazvo, mhepo inotonhorera inopihwa nenzira yekutonhodza yeself-fan inoshandiswa nemota yakajairika haina kukwana, uye kupisa kwacho kwakaderera, uye kutonhora kwefeni kwakazvimirira kunofanira kushandiswa.
Kukanganiswa kwemuchina kunowanzoita resonance, kazhinji, chero mudziyo wemuchina unogadzira resonance phenomenon. Zvisinei, mota inomhanya nefrequency yesimba risingaperi uye kumhanya kwayo inofanira kudzivirira resonance nefrequency yemuchina ye50Hz. Kana mota ichishanda nefrequency conversion, frequency yekushanda ine frequency yakakura, uye chikamu chimwe nechimwe chine frequency yacho, izvo zviri nyore kuita kuti iite resonance pane imwe frequency.
Nguva yekutumira: Kukadzi-25-2025