Me ke nufin No Load Test na Induction Motor?
Testi mai kula yana daya da haka na iya tabbatar da darajarinsu a wurin mafi girman motoron induction. Yana taimakawa wajen samun parametosin zabe-zabin da suka dace da su. Duk da cewa testi mai kula yana aiki a wurin transformers. Idan kana hada, testi mai kula a motoron induction yana nufin kamar testi mai kula a wurin transformer.
A lokacin testin, ana bincike motor daga abubuwan da ke amfani da shi. Kuma ana bayar voltage da ya fi sani da frequency da ya fi sani zuwa stator, kuma motor yana yi aikin bila abubuwan da ke amfani da shi. Ana amfani da duwatsu wattmeter don ci gaba masu power da an bayar zuwa motor. Zabe-zabin testi mai kula yana cika haka:
Ana amfani da ammeter don ci gaba current mai kula, kuma voltmeter yana nuna voltage da ya fi sani. I²R losses a primary side suna karewa saboda waɗannan losses sun badalce da square of the current. Ana sanin cewa current mai kula yana da 20-30% daga full-load current.
Saboda motor yana yi aiki a cikin yanayin mai kula, total input power yana nufin sum of the constant iron losses, kuma friction and windage losses a cikin motor.
Saboda power factor ta motoron induction a cikin yanayin mai kula yana dafi 0.5, akwai wahid na wattmeters zai kasance negative. Saboda haka, yana bukata a karɓe connections of the current coil terminals of that wattmeter don samun readings da za su daidai.
A cikin testi mai kula a transformer, constant values of the equivalent resistance (R0) and reactance (X0) zai iya haske daga measurements.
Idan:
(Vinl) yana nufin input line voltage.
(Pinl) yana nufin total three-phase input power at no-load.
(I0) yana nufin input line current.
(Vip) yana nufin input phase voltage.
Saboda haka,
