Dab tsi yog Txoj Cai Ua Haujlwm Ntawm Peb -theem Siab-voltage AC Tsav?

Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm peb -theem siab-voltage AC lub cev muaj zog yog tib yam li peb li niaj zaus -theem AC lub cev muaj zog. Nws lub ntsiab yog raws li txoj cai ntawm electromagnetic induction thiab tiam ntawm ib tug rotating magnetic teb. Qhov "high voltage" tsuas yog hais txog nws cov qauv tsim rau qib siab dua hauv cov phiaj xwm hluav taws xob (xws li 10kV, 35kV, thiab lwm yam) kom ua tau raws li cov kev xav tau ntawm high -cov khoom siv fais fab; nws tsis hloov nws txoj hauv kev ua haujlwm.

Tsim ib qho chaw sib nqus rotating: Lub stator core ntawm lub cev muaj zog muaj peb txheej windings spaced 120 hluav taws xob degrees sib nrug. Thaum peb siv -theem siab-voltage AC fais fab mov, tam sim no nyob rau hauv txhua theem hloov sinusoidally nrog lub sij hawm, tsim ib tug pulsating magnetic teb nyob rau hauv nws txoj kev winding. Cov peb qhov chaw sib txawv ntawm qhov sib txawv ntawm qhov sib nqus sib nqus, kuj 120 degrees tawm ntawm theem, sib xyaw ua ke hauv huab cua sib txawv ntawm lub cev muaj zog los ua ib qho chaw sib nqus sib nqus. Kev sib hloov ceev (synchronous ceev) ntawm qhov chaw sib nqus no yog txiav txim siab los ntawm cov khoom siv fais fab zaus (f) thiab tus naj npawb ntawm ncej khub (p) ntawm lub cev muaj zog, xam raws li: n₁=60f / p. Induced Rotor Tam sim no: Lub rotating magnetic teb txiav los ntawm lub rotor conductors (feem ntau squirrel- tawb txhuas los yog tooj liab tuav, los yog windings ntawm lub qhov txhab rotor) ntawm synchronous ceev. Raws li Faraday txoj cai ntawm electromagnetic induction, electromotive quab yuam yog induced nyob rau hauv lub rotor conductors. Txij li thaum cov rotor conductors raug kaw (piv txwv li, squirrel- tawb bars yog luv-circuited los ntawm kawg rings), ib tug induced tam sim no yog generated.

Electromagnetic Torque Generation: Cov rotor conductors nqa cov induced tam sim no nyob rau hauv lub rotating magnetic teb. Raws li txoj cai lij choj ntawm lub zog hluav taws xob (Ampere's force), tam sim no - nqa cov conductors muaj zog los ntawm cov hlau nplaum. Cov quab yuam no tsim ib qho hluav taws xob torque ntawm lub rotor, ua rau nws tig mus rau qhov kev taw qhia ntawm rotating magnetic teb.

Kev Ua Haujlwm Asynchronous: Lub rotor ceev (n) yog ib txwm qis dua qhov sib nqus ceev (n₁) ntawm qhov sib nqus sib nqus. Qhov sib txawv ceev no hu ua "slip" (s=(n₁ -}) / n₁). Nws yog daim nplaum no uas ua kom muaj kev sib raug zoo ntawm cov rotor conductors thiab rotating magnetic teb, yog li tsis tu ncua inducing tam sim no thiab torque. Yog hais tias lub rotor ceev sib npaug ntawm synchronous ceev, tus txheeb ze cov lus tsa suab ploj, thiab cov induced tam sim no thiab torque kuj yuav xoom. Yog li ntawd, peb -theem siab-voltage AC motors feem ntau yog asynchronous motors (induction motors).