Maimaitu na Turanci
Prinsipin aiki da karkashin induction type meter shi yana da kyau da kadan gaskiya, saboda haka suna yi amfani da su da ci gaba a cikin maimakon energy a kasar tattalin arzikin da kuma a wurare. A duk induction meters akwai fluxes bi masu wani disc mai adan. Saboda fluxes na zama ne an samun emf, wanda an samu a wani matsayin (kamar yadda aka bayyana a nan) ya jagoranci alternating current na baya, wanda ya haɗa a yi torque.
Duk da haka, emf an samu a matsayin biyu ya jagoranci alternating current a matsayin daya, wanda ya haɗa a yi torque sannan amma a fagen baya. Saboda haka, saboda waɗannan duka torque bi, wanda suka fiye a fagen baya, disc mai adan ya haɗa.
Wannan shine prinsipin aiki na inda induction type meters. Tana da zaɓe ta fara jin daidaitar torque. Za a iya ce flux an samu a matsayin daya ya shafi F1 kuma flux a matsayin biyu ya shafi F2. Duk da haka, damar wannan flux bi ana iya rubuta a haka:
Idan, Fm1 da Fm2 su ne ma'aice suke F1 da F2, B shine farko da ke bayan biyu fluxes.
Za a iya rubuta daidaitar emf a matsayin daya a haka
a matsayin biyu. Duk da haka, za a iya rubuta daidaitar eddy currents a matsayin daya a haka
Idan, K shine wata sabbin alama da f shine frequency.
Amsa da za a iya faɗa diagram mai phasor wanda ya nuna F1, F2, E1, E2, I1 da I2. Daga diagram mai phasor, ya danganta cewa I1 da I2 su lagga E1 da E2 da angle A.
Angle bayan F1 da F2 shine B. Daga diagram mai phasor, angle bayan F2 da I1 shine (90-B+A) kuma angle bayan F1 da I2 shine (90 + B + A). Duk da haka, za a iya rubuta daidaitar deflecting torque a haka
Duk da haka, za a iya rubuta daidaitar Td2 a haka,
Torque na gaba shine Td1 – Td2, idan an saukar da Td1 da Td2 da kuma an saurara daidaitar a haka
Wannan shine daidaitar umuminta da ke bayan deflecting torque a cikin induction type meters. Duk da haka, akwai abubuwa biyu na induction meters kuma su ne a haka:
Single phase type
Three phase type induction meters.
A nan za a iya magana game da single phase induction type a cikin bayanai. Wannan shine hoton single phase induction type meter.
Single phase induction type energy meter na da abubuwa uku da suka fiye a kan cikin system bi masu muhimmanci, wadannan su ne a haka:
Driving System:
Driving system na da electromagnets bi masu biyu, a kan bi pressure coil da current coils suka fitowa, kamar yadda aka bayyana a nan a diagram. Coil na da load current shine current coil, amma coil na da supply voltage (i.e. voltage across the coil is same as the supply voltage) shine pressure coil. Shading bands suka fitowa kamar yadda aka bayyana a diagram don in ba da angle bayan flux da applied voltage equal to 90 degrees.
Moving System:
Don in ƙara friction zuwa yawan daidai, floating shaft energy meter ya a yi amfani da shi, friction ya ƙara zuwa yawan daidai saboda disc mai adan wanda ya fara da material mai tsirriyar kamar aluminium bai tabbaci da wani surface ba. Yana haihuwa a air. Yana da wani tambayar a kan mindiyar masu gida ita ce, yadda aluminium disc ya haihuwa a air? Don in amsa wannan tambayar, ya kamata a duba cikakken bayanai na disc mai tsirriyar, a halin yanzu disc na da small magnets a fagen uku da karamin. Magnet na fagen uku ya ji a electromagnet a upper bearing, amma magnet na fagen karamin ya ji a lower bearing magnet, saboda haka, wajen da suka fi karfi light rotating aluminium disc ya haihuwa a air.
Braking System:
Permanent magnet an amfani da shi don in samun breaking torque a cikin single phase induction energy meters, wanda suka shiga near corner aluminium disc.
Counting System:
Nambari a cikin meter shine mutane a kan revolutions an samu a kan aluminium disc, muhimmin aikin system shine in record number of revolutions an samu a kan aluminium disc. Duk da haka, za a iya duba aikin single phase induction meter. Don in fahimta aikin meter, za a iya duba diagram a haka:
A nan za a iya duba cewa pressure coil na da nature mai inductive da yawa da kuma ya da turns masu yawan daidai. Current flowin a pressure coil shine Ip wanda ya lagga voltage da angle 90 degrees. Wannan current ya samu flux F. F an koyar da biyu Fg da Fp.
Fg wanda ya shiga small reluctance part across the side gaps.
Fp: Ya jawo da driving torque a kan aluminium disc. Ya shiga high reluctance path and is in phase with the current in the pressure coil. Fp shine alternating in nature and thus emf Ep and current Ip. Load current wanda aka bayyana a diagram shine flowing through the current coil produces flux in the aluminium disc, and due this alternating flux there on the metallic disc, an eddy current is produced which interacts with the flux Fp which results in production of torque. As we have two poles, thus two torques are produced which are opposite to each other. Hence from the theory of induction meter that we have discussed already above the net torque is the difference of the two torques.
Muhimmanci na Induction Type Meters
Wadannan ne muhimmanci na induction type meters:
