Rau lub sijhawm ntev, nyob rau lub sijhawm xav tau kev tswj hwm kev ua haujlwm siab, kev tswj hwm kev ceev uas siv DC motors tau ua tiav. Txawm li cas los xij, DC motors muaj qee qhov tsis txaus ntseeg, xws li txhuam hniav thiab cov khoom sib txuas uas yooj yim hnav thiab tsim kua muag thiab yuav tsum tau saib xyuas ntau zaus. Lub commutator yuav tsim sparks thaum commutating, yog li ntawd lub siab tshaj plaws ceev ntawm lub cev muaj zog yog txwv, thiab daim ntawv thov ib puag ncig kuj txwv, thiab cov qauv ntawm DC lub cev muaj zog yog complex, kev tsim yog nyuaj, cov khoom siv steel siv ntau heev, thiab tus nqi tsim khoom yog siab. Txawm li cas los xij, AC motors, tshwj xeeb tshaj yog squirrel tawb induction motors, tsis muaj qhov tsis txaus siab saum toj no, thiab rotor inertia me dua li ntawm DC motors, uas ua rau cov lus teb zoo dua. Nyob rau hauv tib lub ntim, lub zog tso zis ntawm AC lub cev muaj zog tuaj yeem nce 10% ~ 70% piv nrog DC lub cev muaj zog, ntxiv rau, lub peev xwm ntawm AC lub cev muaj zog tuaj yeem loj dua li ntawm DC lub cev muaj zog, ncav cuag qhov siab dua. thiab ceev. Niaj hnub nimno CNC tshuab cuab yeej nyiam siv AC servo tsav, thiab AC servo tsav tau hloov DC servo tsav.
Asynchronous
Asynchronous AC servo lub cev muaj zog yog hais txog AC induction lub cev muaj zog. Nws tau muab faib ua peb-theem thiab ib-theem, nrog rau squirrel tawb thiab hlau-hloov hom, thiab feem ntau yog siv squirrel tawb peb-theem induction motors. Nws cov qauv yog yooj yim, piv nrog tib lub peev xwm ntawm DC lub cev muaj zog, qhov hnyav yog 1/2 sib dua, thiab tus nqi tsuas yog 1/3 ntawm DC lub cev muaj zog. Qhov tsis zoo yog tias nws tsis tuaj yeem ua rau kev lag luam ua tiav ntau yam kev tswj hwm kev nrawm, thiab hysteresis excitation tam sim no yuav tsum tau nqus los ntawm kab sib chaws. Yog li ntawd, lub zog ntawm cov kab sib chaws deteriorates.
Lub asynchronous AC servo lub cev muaj zog ntawm no squirrel tawb rotor yog hu ua asynchronous AC servo lub cev muaj zog, uas yog sawv cev los ntawm IM.
Synchronous hom
Txawm hais tias synchronous AC servo motors yog ntau dua li induction motors, lawv yooj yim dua DC motors. Nws stator, zoo li lub induction lub cev muaj zog, yog nruab nrog ib tug symmetrical peb-theem winding ntawm lub stator. Lub rotor yog txawv, thiab nws tau muab faib ua ob pawg: electromagnetic thiab non-electromagnetic raws li cov qauv sib txawv rotor. Hom tsis-electromagnetic yog muab faib ua hysteresis, cov hlau nplaum ruaj khov thiab hom reactive. Ntawm lawv, hysteresis thiab reactive synchronous motors muaj qhov tsis zoo xws li kev ua haujlwm tsis zoo, tsis zoo lub zog, thiab kev tsim khoom me me. Cov hlau nplaum ruaj khov synchronous motors feem ntau yog siv hauv CNC tshuab cuab yeej. Piv nrog rau hom electromagnetic, hom hlau nplaum ruaj khov muaj qhov zoo ntawm cov qauv yooj yim, txhim khu kev lag luam thiab kev ua haujlwm siab, thiab qhov tsis zoo yog qhov loj me thiab cov yam ntxwv tsis zoo pib. Txawm li cas los xij, tom qab cov hlau nplaum tas mus li synchronous lub cev muaj zog siv lub ntiaj teb tsis tshua muaj hlau nplaum nrog kev ua haujlwm siab thiab kev sib koom tes siab, nws tuaj yeem ua tau li 1/2 me dua li DC hluav taws xob sab nraud loj, qhov hnyav yog txo los ntawm 60%, thiab rotor inertia raug txo. rau 1/5 ntawm DC lub cev muaj zog. Piv nrog asynchronous motors, nws muaj kev ua haujlwm siab vim yog kev siv cov hlau nplaum tas mus li excitation, uas tshem tawm excitation poob thiab cuam tshuam txog kev poob. Thiab vim tias tsis muaj lub nplhaib sib dhos thiab txhuam yuav tsum tau ua los ntawm cov tshuab electromagnetic synchronous, nws cov kev ntseeg tau zoo ib yam li ntawm induction (asynchronous) motors, tab sis lub zog muaj zog ntau dua li ntawm asynchronous motors, yog li ntawd lub ntim ntawm cov hlau nplaum ruaj khov. synchronous motors yog me dua li ntawm asynchronous motors. Qhov no yog vim hais tias nyob rau hauv qis speeds, lub meej zog ntawm lub induction (asynchronous) lub cev muaj zog yog ntau loj dua thaum nws outputs tib active zog vim nws tsis tshua muaj zog, thiab lub ntsiab loj ntawm lub cev muaj zog yog txiav txim los ntawm lub meej zog.