Mai PMMC ne?

Takaitaccen PMMC Meter

PMMC meter (ko kuma ake kira D’Arsonval meter ko galvanometer) yana nufin zubairi mai yadda da ya yi ƙarin hanyar tafiya wata darajar da take sauka a tsari mai sani na mafashinsu.

Gargajiya PMMC

PMMC meter (ko D’Arsonval meters) ana gina daga baya 5 muhimman abubuwa:

• Karamin Abubuwa ko Tsarin Manajan Mafashi

• Coil Mai Yawanci

• Sistem Mai Neman Su

• Sistem Mai Tabbatarwa

• Meter

Prinsipin Gudummawa

PMMC meter yana amfani da Lawoyin Faraday na induksi mai karfi, inda wata mai yadu a tsari mai karfi yake samun faduwar da ya dace da yadda, wanda ke tara shiga mai yadda a jerin ɗaya.

Equation na Torque na PMMC

Zan iya rubuta expression na gyale na torque a wurare mai manajan mafashi da coil mai yawanci ko PMMC instruments. Ana sani cewa a wurare mai manajan mafashi na coil mai yawanci, torque na deflection yana ba da takaito:

• Td = NBldI inda N shine kofin turns,

• B shine density na flux mai karfi a kan ɗaya,

• l shine ɗaliban coil mai yawanci,

• d shine girman coil mai yawanci,

• I shine electric current.

A nan don wurare mai manajan mafashi na coil mai yawanci, torque na deflection yana da kyau da current, mathematically zan iya rubuta Td = GI. Don haka a yanayi zan iya cewa G = NBIdl. A lokacin da ya faru, ana iya cewa controlling torque da torque na deflection suna da dace. Tc shine controlling torque, a lokacin da muke sabon controlling torque da torque na deflection, zan iya cewa,GI = K.x inda x shine deflection, saboda haka current yana ba da takaito

Saboda deflection yana da kyau da current, don haka muna bukatar scale mai tsari a cikin meter don ƙarin hanyar tafiya.

A nan muna son sanin diagram mai karatu na ammeter. Zan iya duba karatu kamar yadda aka bayyana a nan:

Current I yana kusa da biyu a matsayin Is da Im a matsayin A. A nan, idan ban sanin yadda suke, zan iya bayyana construction na resistance na shunt. Duk abubuwan da suka fiye game da resistance na shunt su ne a nan:

Resistance na electrical na wannan shunts ba za su ci gaba a tsari mai yawa, suke da nau'o'i da yawa da temperature coefficient. Kuma resistance yana da kyau da wani lokaci. A nan, property mafi inganci suke cewa suke da kyau da su kaɓanta current mai yawa bila da zuwa mai yawa. Ushe manganin ce da ake amfani a kan DC resistance. Saboda haka zan iya cewa value na Is ya fi Is da Im saboda resistance na shunt ya fi. Daga hakan, muna,

Inda, Rs shine resistance na shunt da Rm shine electrical resistance na coil.

Daga abubuwan da aka bayyana a nan, zan iya rubuta,

Inda, m shine magnifying power na shunt.

Abubuwan Da Sune Ciki a Wurare Mai Manajan Mafashi Da Coil Mai Yawanci

• Abubuwan da sune ciki saboda permanent magnets

• Yawan resistance na moving coil da temperature

Fadada Wurare Mai Manajan Mafashi Da Coil Mai Yawanci

• Scale yana da tsari mai tsari saboda current yana da kyau da deflection na pointer. Saboda haka, yana da kyau ƙarin hanyar tafiya a kan wannan instrument.

• Power consumption ta da kyau a kan instrument da suke.

• Torque to weight ratio mai yawa.

• Instrument da suke yana da muhimmanci, instrument daban-daban ita ce zai iya amfani a kan ƙarin hanyar tafiya abubuwa daban-daban tare da amfani da values na shunts da multipliers.

Muhimmancin Wurare Mai Manajan Mafashi Da Coil Mai Yawanci

• Instrument da suke ba zai iya ƙarin hanyar tafiya AC quantities.

• Cost na instrument da suke ya fiye a halin moving iron instruments.