DC Tsav Kev Tiv Thaiv

Kev tiv thaiv ntawm DC motors yog qhov tseem ceeb los xyuas kom meej lawv cov kev ua haujlwm ib txwm muaj, tiv thaiv kev puas tsuaj rau lub cev muaj zog lossis cov cuab yeej siv tshuab, thiab tiv thaiv tus kheej kev nyab xeeb. Yog li, DC lub cev muaj zog tiv thaiv yog ib qho tseem ceeb ntawm kev tswj hluav taws xob. Cov txheej txheem tiv thaiv no suav nrog luv luv - tiv thaiv Circuit Court, overvoltage thiab undervoltage tiv thaiv, tiv thaiv overload, ceev txwv kev tiv thaiv, thiab tiv thaiv excitation. Qee cov txheej txheem tiv thaiv zoo ib yam rau cov AC asynchronous motors. Kab lus no feem ntau qhia txog kev tiv thaiv overload thiab kev tiv thaiv excitation.

1. DC lub cev muaj zog tiv thaiv overload
Thaum pib, nres, thiab luv - lub sij hawm overload, tam sim no ntawm DC lub cev muaj zog tuaj yeem loj heev. Tam sim no yuav tsum tau txwv rau qhov tso cai overload. Kev tiv thaiv overload rau DC motors feem ntau ua tiav siv lub overcurrent relay. Kev tiv thaiv Circuit Court yog pom nyob rau hauv daim duab 9.9, qhov twg armature circuit txuas mus rau overcurrent relay KA2 nyob rau hauv series.

Lub hauv paus ntsiab lus ntawm kev ua haujlwm hauv Circuit Court yog raws li nram no: Thaum lub cev muaj zog load yog ib txwm, lub armature tam sim no ntws los ntawm overcurrent relay yog ib txwm, KA2 tsis mus, nws ib txwm kaw kev sib cuag tseem raug kaw, thiab tswj Circuit Court tuaj yeem ua haujlwm ib txwm. Nyob rau hauv qhov kev tshwm sim ntawm ib tug overload, lub armature Circuit Court tam sim no nce. Thaum qhov tam sim no tshaj qhov teeb tsa tus nqi ntawm KA2, lub overcurrent relay KA2 mus ncig ua si, nws ib txwm kaw kev sib cuag qhib, txiav tawm cov tswj Circuit Court thiab disconnecting DC lub cev muaj zog los ntawm lub hwj chim mov, yog li muab kev tiv thaiv overload.

2. Kev tiv thaiv kev tiv thaiv ntawm DC Motors Raws li kev ua haujlwm ib txwm muaj, yog tias qhov hluav taws xob hauv qhov hluav taws xob hauv hluav taws xob poob qis los yog muaj hluav taws xob tam sim ntawd, lub cev muaj zog yuav nce siab, ua rau muaj qhov tshwm sim "khiav tawm". Qhov tshwm sim "runaway" no tuaj yeem ua rau lub cev muaj zog lossis cov cuab yeej siv kho mob hnyav heev. Txhawm rau tiv thaiv DC lub cev muaj zog los ntawm kev poob lossis tsis muaj zog ntawm nws qhov excitation, ib qho hluav taws xob relay yog siv. Lub undercurrent relay KA1 yog txuas nrog hauv series hauv lub voj voog excitation. Thaum lub excitation tam sim no tsim nyog, lub undercurrent relay koom, nws ib txwm qhib kev sib cuag kaw, thiab tswj Circuit Court ua hauj lwm ib txwm. Thaum lub excitation tam sim no txo ​​qis los yog xoom, lub undercurrent relay tso tawm vim yog qhov tsis tshua muaj tam sim no, nws ib txwm qhib kev sib cuag rov qab mus rau lub xeev qhib, txiav tawm cov tswj Circuit Court thiab disconnecting lub cev muaj zog los ntawm lub hwj chim mov, yog li muab kev tiv thaiv excitation.