Kuuma ndi kukhazikika:
Kuuma kumatanthauza kuthekera kwa kapangidwe kake kapena kapangidwe kake kokana kukomoka kotanuka mukakakamizidwa, ndipo ndichizindikiro chazovuta zakuchepa kwa zinthu kapena kapangidwe kake. Kuuma kwa chinthu nthawi zambiri kumayesedwa ndi modulus of elasticity E. M'makulidwe akuchulukirachulukira, kuuma ndi kuchuluka kokwanira kwa gawo lomwe limasunthika ndi kusunthika, komwe kumafunikira kuyambitsa kusamutsidwa kwa mayunitsi. Kubwezeretsanso kumatchedwa kusinthasintha, kusamutsidwa komwe kumachitika chifukwa cha gulu limodzi. Kukhazikika kumatha kugawidwa pakukhazikika kwanyengo komanso kuuma mwamphamvu.
Kuuma kwake (k) kwa kapangidwe kake kumatanthawuza kuthekera kwa thupi kukana kusokonekera ndi mavuto.
k = P / δ
P ndiye mphamvu yomwe imagwira ntchito kapangidwe kake ndipo δ ndiye kusinthika chifukwa champhamvu.
Kuuma kwazungulira (k) kwa mawonekedwe ozungulira ndi awa:
k = M / θ
M ndiye mphindi ndipo θ ndiye njira yosinthira.
Mwachitsanzo, chitoliro chachitsulo chimakhala cholimba, nthawi zambiri mapindikidwe omwe ali ndi mphamvu yakunja ndi ochepa, pomwe gulu la mphira ndilofewa, ndipo mapindikidwe omwe amachititsidwa ndi mphamvu yomweyo ndi akulu. Kenako timati chitoliro chachitsulo chimakhala cholimba, ndipo gulu la mphira ndilofooka komanso limasinthasintha.
Pogwiritsa ntchito servo mota, ndimalumikizidwe okhwima olumikizira mota ndi katundu polumikiza, pomwe kulumikizana kosasintha ndikulumikiza mota ndikunyamula ndi lamba kapena lamba wofananira.
Kuyimika kwamagalimoto ndikuthekera kwa shaft yamagalimoto kukana kusokonekera kwa makokedwe akunja. Titha kusintha kuuma kwa mota mu driver wa servo.
Kuuma kwamakina a servo mota kumayenderana ndi kuthamanga kwake. Nthawi zambiri, kukhathamira kumakulirakulira, kumawonjezera liwiro la kuyankha, koma ngati litasinthidwa kwambiri, mota umatulutsa mawonekedwe. Chifukwa chake, pamagawo onse a AC servo drive, pali zosankha zingapo kuti musinthe pafupipafupi mayankho. Kusintha mayankho pafupipafupi malinga ndi mawonekedwe amakina, zimafunikira nthawi ndi luso kwa omwe akukonza zolakwika (makamaka, kusintha magawo opindulira).
Mu mawonekedwe a servo system mode, mota umasochera pogwiritsa ntchito mphamvu. Ngati mphamvuyo ndi yayikulu ndipo mbali yocheperako ndiyochepa, ndiye kuti servo system imawerengedwa kuti ndi yolimba, apo ayi, dongosolo la servo limawerengedwa kuti ndi lofooka. Kukhazikika uku kuli pafupi ndi lingaliro lakuyankha mwachangu. Kuchokera pamalingaliro a wowongolera, kukhazikika kwenikweni ndi gawo lomwe limapangidwa ndi kuthamanga kwachangu, kuzungulira kwa malo ndi nthawi yokhazikika. Kukula kwake kumatsimikizira kuthamanga kwa mayankho pamakinawo.
Koma ngati simukusowa kuyika mwachangu ndipo mukungofunikira kulondola, ndiye kuti kukana kuli kochepa, kukhazikika kumakhala kotsika, ndipo mutha kukwaniritsa masanjidwe olondola, koma nthawi yakukhazikika ndiyitali. Chifukwa malowa amachedwa pang'onopang'ono ngati kukhazikika kuli kotsika, chinyengo cha malo olakwika chidzakhalapo poyankha mwachangu komanso nthawi yayifupi yoyika.
Mphindi ya inertia imalongosola kusunthika kwa kuyenda kwa chinthucho, ndipo mphindi ya inertia ndiyeso ya inertia ya chinthu chozungulira mzerewo. Mphindi ya inertia imangogwirizana ndi utali wozungulira wazunguliridwe ndi unyinji wa chinthucho. Nthawi zambiri, inertia yonyamula katundu imaposa kakhumi ka rotor inertia yamagalimoto.
Mphindi ya inertia ya njanji yowongolera ndi kutsogolera kutsogolera imakhudza kwambiri kuuma kwa makina oyendetsa galimoto a servo. Mukapeza phindu lokhazikika, nthawi yayitali kwambiri ya inertia ndiyomwe imakulirakulira, kumakhala kosavuta kuyambitsa kugwedeza kwamagalimoto; yaing'ono nthawi ya inertia, yocheperako kuuma kwake, sipamakhala kuti mota umagwedezeka. Ikhoza kuchepetsa mphindi ya inertia posintha njanji ndikulowetsa ndodo yaying'ono, kuti ichepetse kuchepa kwa katundu kuti isagwedezeke ndi mota.
Nthawi zambiri, posankha ma servo system, kuphatikiza pakuwunika magawo a makokedwe ndi kuthamanga kwamagalimoto, tifunikiranso kuwerengera ma inertia omwe asinthidwa kuchokera pamakina kupita pa shaft yamagalimoto, kenako ndikusankha mota ndi inertia yoyenera kukula malinga ndi zofunikira zenizeni pamakina.
Pogwiritsa ntchito njira yolakwika (njira yoyeserera), kukhazikitsa magawo a inertia molondola ndiye chiyembekezo chololeza bwino kwambiri makina amachitidwe ndi servo.
Kodi inertia ikufanana ndi chiyani?
Malinga ndi Lamulo la Niu Er:
Makina ofunikira a dongosolo lodyetsa = dongosolo lamphindi la inertia J × kuthamangitsidwa kwazing'ono θ
Kuchulukitsa kwa angular kocheperako θ, kumakhala nthawi yayitali kuchokera kwa wolamulira mpaka kumapeto kwa dongosolo, ndikuchedwa kuyankha kwadongosolo. Ngati kusintha kwa θ, kuyankha kwamachitidwe kudzasintha mwachangu komanso pang'onopang'ono, zomwe zingakhudze kulondola kwa machining.
Pambuyo pa servo mota itasankhidwa, kuchuluka kwake kotulutsa sikungasinthe. Ngati mukufuna kuti kusintha kwa θ kukhale kocheperako, ndiye kuti J ayenera kukhala wocheperako momwe angathere.
Makina a inertia J = servo mota kasinthasintha inertia kuthamanga JM + mota shaft kutembenuka katundu inertia kuthamanga JL.
Katundu inertia JL amapangidwa ndi inertia wa worktable, fixture, workpiece, wononga, lumikiza ndi zina liniya ndi makina mbali kusuntha n'kukhala inertia wa galimoto kutsinde. JM ndi inertia ya servo motor rotor. Pambuyo pa servo motor itasankhidwa, mtengowu ndiwokhazikika, pomwe JL amasintha ndikusintha kwa cholembera. Ngati mukufuna kuti kusintha kwa J kukhale kocheperako, ndibwino kuti kuchuluka kwa JL kukhale kocheperako. Nthawi zambiri, mota yomwe ili ndi inertia yaying'ono imakhala ndi magwiridwe antchito abwinobwino, kuyankha mwachangu poyambira, kuthamangitsa ndi kuyimitsa, komanso magwiridwe antchito othamanga kwambiri, omwe ndi oyenera kuwunikira pang'ono komanso malo othamanga kwambiri. Motors of inertia and main inertia ndioyenera kutengera katundu wamkulu komanso kukhazikika kwakukulu, monga makina oyenda ozungulira ndi mafakitale ena azida.
Chifukwa chake kuuma kwa AC servo mota ndikokulirapo ndipo kukhazikika sikokwanira. Nthawi zambiri, phindu la driver wa AC servo liyenera kusinthidwa kuti lisinthe momwe amayankhira. Inertia ndi yayikulu kwambiri ndipo inertia siyokwanira. Ndikufananiza pang'ono pakati pa kusintha kwa inertia kwa katundu ndi inertia yama AC servo mota.
Kuphatikiza apo, mphamvu ya ochepetsera katundu wolimba iyenera kuganiziridwa: bokosi lamagetsi limatha kusintha kufanana kwa inertia. Nthawi zambiri, pamene kuchuluka kwa inertia kwa katundu pamagalimoto ndikoposa 5, chowongolera chimayesedwa kuti chikuthandizira kufanana kwa inertia. Chiŵerengero cha inertia chimakhala chofanana mofanana ndi kukula kwa chiyerekezo.
Post nthawi: Sep-02-2020