Amperemeter na Watta ta Turanci Electrodynamometer

Takardarwa na Wattmeter ta Electrodynamometer

Wattmeter ta electrodynamometer yana sanya abinci da kuma alhakin magana suka gudanar da hanyoyin kayayyaki da alhakin magana.

Prinsipi na Yadda Ya Samu

Yanzu zaka iya nemi bayanan takamantar electrodynamometer. Ana cikin wadannan mafi girma:Akwai nau'o'in kwayoyi a cikin electrodynamometer. Su ne:

Kwayoyin Mai Kwallon Goma

Kwayoyin mai kwallon goma ke kawo shiga mai kalla a kan instrumentin da ke kawo shiga mai kalla. Don samun karfin kayayyaki, ana baka kwallon goma mai kwallon goma da tarihi mai yawa a kan. An gina kwayoyin mai kwallon goma a kan tsirriyar mai kallanci da ya fi mai kallanci, saboda haka ana iya kawo shiga mai kalla a kan. A cikin wattmeter ta electrodynamometer, kwayoyin mai kwallon goma ce mai kwayoyin kayayyaki da aka kawo shiga a kan alhakin magana, saboda haka kwallon goma ta ke mutane da alhakin magana.

Kwayoyin Mai Tsirriyar

Kwayoyin mai tsirriyar an gina biyu da suke biyu, suke da kuma an kawo shiga a kan mafi girman, saboda haka kwallon goma mafi girman za a fuskantar su. Yanzu dalilin ya fi dace da amfani da biyu kwayoyin mai tsirriyar ba kawai daya, don haka za a iya gina su don kawo shiga mafi girman kayayyaki.

Ana kiran kwayoyin su kwayoyin alhakin magana ta wattmeter ta electrodynamometer. Daga baya an gina kwayoyin mai tsirriyar su don kawo shiga kwallon goma kadan da kwanaki 100 amperes, amma a yanzu wattmeter masu zamani an gina su don kawo shiga kwallon goma kadan da kwanaki 20 amperes don sauƙaƙe kayayyaki.

Sistem na Nemo

Daga biyu na kontrolololar (gravity control, spring control) an amfani da spring control a cikin wannan irin wattmeter. Ba za a iya amfani da gravity control saboda akwai kyaukyau na dabi'u.

Sistem na Dabbobi

An amfani da damping ta air friction saboda damping ta eddy current zai iya kawo karfi ga hanyoyin kayayyaki na musamman, wanda yake da shiga zuwa dabi'u.

Akili na scale ta sama daɗi ana amfani a cikin irin instrumentin da kwayoyin mai kwallon goma ke kawo shiga linear a kan 40 daɗi zuwa 50 daɗi a kan kofin daɗin.

Yanzu zaka iya rubuta takamantaccen controlling torque da deflecting torques. Don haka zaka iya duba diagrammin circuit ta daɗi:

Na sani cewa instantaneous torque a cikin instrumentin electrodynamic ke mutane da marubucin instantaneous values of currents flowing through both the coils and the rate of change of flux linked with the circuit.

Idan I1 da I2 suna cikin instantaneous values of currents in pressure and current coils respectively. Saboda haka rubutun da take da za a iya rubuta shine:

Idan x shine angle.

Yanzu idan applied value of voltage across the pressure coil ba

Saboda electrical resistance of the pressure coil yana da kyau, ana iya tabbatar da reactance ta compared to its resistance. Saboda haka, impedance ce equal to its electrical resistance, making it purely resistive.

Rubutun da take da instantaneous current can be written as I2 = v / Rp where Rp is the resistance of pressure coil.

Idan akwai phase difference between voltage and electric current, then expression for instantaneous current through current coil can be written as

As current through the pressure coil is very very small compared to the current through current coil hence current through the current coil can be considered as equal to total load current.Hence the instantaneous value of torque can be written as

Average value of deflecting torque can be obtained by integrating the instantaneous torque from limit 0 to T, where T is the time period of the cycle.

Controlling torque is given by Tc = Kx where K is spring constant and x is final steady state value of deflection.

Farkon

• Scale is uniform upto a certain limit.

• They can be used for both to measure ac as well dc quantities as scale is calibrated for both.

Dabi'u

• Errors in the pressure coil inductance.

• Errors may be due to pressure coil capacitance.

• Errors may be due to mutual inductance effects.

• Errors may be due connections.(i.e. pressure coil is connected after current coil)

• Error due to Eddy currents.

• Errors caused by vibration of moving system.

• Temperature error.

• Errors due to stray magnetic field.