- #1
arivel
- 45
- 1
Hi everyone .with your help I would like to understand if there is the possibility of creating a current sensor with the method that I illustrate below. it has to measure from 50mA up to a few dozen A, I need maximum precision and linearity.it is similar to the current transformers that already exist but those are made to measure large currents and use a ferromagnetic core.
what I have in mind are many very small toroidal plastic cores (therefore permeability similar to that in air) placed next to each other in order to form a straight line because the wire traversed by the alternating current to be measured passes through the central hole of each one.each toroid is wrapped in one or more turns of turns, this is to be decided later because a compromise must be made between number of turns, inductance, impedance and DC resistance.
the output of the last turn of the first toroid is connected to the first turn of the second toroid and so on until the last one, therefore the turns of all the toroids are connected to each other. this is to exploit a greater quantity of magnetic field (which is at most in contact with the wire where the electric current passes) and to have a single winding.
to understand better, it would be like having many Rogowski coils connected in series but without space between the conductor to be measured and the detection coil.the main question is the following: each toroidal winding provides me with a voltage, since each winding is connected in series can I obtain a voltage resulting from the sum of all the voltages produced by each toroidal coil?.
Thank you
what I have in mind are many very small toroidal plastic cores (therefore permeability similar to that in air) placed next to each other in order to form a straight line because the wire traversed by the alternating current to be measured passes through the central hole of each one.each toroid is wrapped in one or more turns of turns, this is to be decided later because a compromise must be made between number of turns, inductance, impedance and DC resistance.
the output of the last turn of the first toroid is connected to the first turn of the second toroid and so on until the last one, therefore the turns of all the toroids are connected to each other. this is to exploit a greater quantity of magnetic field (which is at most in contact with the wire where the electric current passes) and to have a single winding.
to understand better, it would be like having many Rogowski coils connected in series but without space between the conductor to be measured and the detection coil.the main question is the following: each toroidal winding provides me with a voltage, since each winding is connected in series can I obtain a voltage resulting from the sum of all the voltages produced by each toroidal coil?.
Thank you
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