We are using 10Kw BLDCs fed by 3 phase inverters. We wish to scope the current waveform in the battery supply cables to the inverter. We have selected the MLX91209 current sensor since it gives a non-invasive solution, and our current peaks will be some 400A. One must simply mount it into a gap in a ring torroid, and then run the conductor through that same torroid. The MLX91209 then gives a voltage output proportional to the current. It has the same bandwidth as a current sense transformer, near enough.
i forget the company I used to get cores from. They had a good selection and you could buy one if needed. You might have to match the alloy to the composition.
I was working on making a variable inductor that could be controlled with current from another winding.
Melexis devices usually requires a programmer which is expensive
…however, it only gives an accurate result if the conductor being measured completely fills the aperture, which is 20mm by 10mm. It doesn’t say what kind of accuracy you’ll get with only a certain percentage of aperture fill factor...
{The TA167 current clamp measurer, as kindly linked by rjenkinsgb doesnt appear to have any such "aperture fill factor discrepancy" **broken link removed**
)
Also, this device will need a micro to be added so that the "zero current" reading can be calibrated?..(.since there is no inbuilt degaussing facility)
Presumably since we only want DC measurements, we don’t have to give it a +/-15V supply, and can just make do with +15vdc supply, then just be sure we put the cable through the aperture in the right way round?