3 rooj plaub qhia koj yuav ua li cas siv clamp meter los kuaj lub cev muaj zog
Case 1
Phenomenon: Ib qho ore crusher nrog lub cev muaj zog ntawm 15kW. Tom qab lub cev muaj zog overhauled, nws khiav ib txwm tsis muaj load, tab sis nws yuav tsis tau loaded. Thaum lub load ntxiv, lub cev muaj zog yuav mus vim yog overload. Tom qab kev tshuaj xyuas, cov khoom siv tshuab thiab cov khoom siv hluav taws xob zoo li qub. DC tsis kam ntawm lub cev muaj zog kauj yog 2.4Ω, 3.2Ω thiab 2.4Ω feem; Peb-theem tsis muaj load tam sim no ntsuas los ntawm clamp ammeter yog 9A, 5A thiab 8.8A feem. Nws yog tseeb tias lub cev muaj zog coil muaj Fault.
Kev tsom xam: Tshem lub hau kawg ntawm lub cev muaj zog, thiab pom tias ib qho ntawm cov hlau xaus ntawm ib qho ntawm cov theem windings tau loosened, thiab cov solder tau yaj. Lub cev muaj zog yog ob-wired, ib qho yog disconnected thiab lwm yam tseem txuas nrog, yog li ntawd lub torque yog txo, thiab nws tsuas tig tsis tau load, tab sis nws yuav tsis nqa lub load.
Case 2
Phenomenon: Muaj lub cev muaj zog nrog lub zog ntsuas ntawm 13kW. Tom qab lub kauj yog rewound rau kev sim khiav, qhov ceev ntawm lub cev muaj zog yog ib txwm thaum lub cev muaj zog khiav tsis muaj load. Tom qab lub load yog nyob rau, qhov ceev ntawm lub cev muaj zog qeeb heev, los yog txawm tsis tig. Qhov ntsuas hluav taws xob ntsuas hluav taws xob thiab qhov tsis kam ntawm txhua theem yog qhov qub, thiab peb-theem tsis muaj kev thauj khoom tam sim no ntsuas nrog lub ntsuas ntsuas ntsuas yog qhov sib npaug, tab sis cov nqi tam sim no yog tag nrho me me.
Kev tshuaj xyuas: Nws tau txiav txim siab tias qhov kev sib txuas winding tsis raug. Qhib lub hau kawg, pom tias lub cev muaj zog nrog △ kev sib txuas tau ua yuam kev nrog Y kev sib txuas, uas ua rau lub zog khiav ib txwm me me dhau los nqa lub nra, vim tias lub zog ntawm Y kev sib txuas yog ib feem peb ntawm qhov. kev sib txuas △.
Case 3
Phenomenon: Lub tshuab cuab yeej siv lub cev muaj zog 4kW. Tom qab lub hwj chim qhib, lub cev muaj zog tsis tig thiab tsuas yog hums. Tshem tawm cov xaim hluav taws xob, kuaj xyuas tias muaj hluav taws xob ntawm lub zog hluav taws xob, peb theem hluav taws xob kuj zoo li qub, DC tsis kam ntawm cov winding kuj sib npaug, cov rwb thaiv tsev tsim nyog, thiab kev sib hloov tshuab yog hloov tau. Thaum kawg, ntsuas qhov tsis muaj load tam sim no nrog lub clamp ammeter ntawm lub cev muaj zog coj mus rau sab qis ntawm qhov hloov. Yog li ntawd, muaj tam sim no nyob rau hauv ob theem thiab tsis muaj tam sim no nyob rau hauv ib theem.
Analysis: Nws qhia tau hais tias muaj ib qho txhaum nyob rau hauv cov hlau conduit. Rub tawm cov hlau sab hauv ntawm cov yeeb nkab steel, thiab pom tias ib feem ntawm cov hlau tau tawg lawm, sib ntsib ib leeg zoo li ob lub ntsiab lus, thiab muaj cov hmoov dawb oxidized nyob rau hauv qhov kawg ntawm cov hlau. Qhov no yog vim muaj qhov nro ntau dhau thaum hla cov yeeb nkab, cov hlau yog thinned thiab elongated, thiab lub sij hawm ntev energized tam sim no heats thiab oxidizes ntawm qhov chaw zoo li tawg. Lub sijhawm no, qhov hluav taws xob tseem tuaj yeem ntsuas ntawm lub zog hluav taws xob lub taub hau, tab sis tam sim no tsis tuaj yeem hla.
