Electronics > Projects, Designs, and Technical Stuff
Building a current shunt?
beanflying:
Depending on the use of flat works fine crimped or drilled and locked down with bolts for heavy applications. Most of the ones I have done were 4-800A at 12V nominal and if they were under or over adding or taking away a strip was the easy option for adjustment. You could always under resist them then file for trim if you wanted but we were not after that level of accuracy.
Way back when I was playing with Electric and Solar vehicles at school (30 + years ago :palm:) Wire crimped on one or both ends into copper bar worked well. Generally a close fitting hole then a series of centre punches from either side gets a good crimp. For the few trimable ones I have used a copper bar with holes drilled and tapped in from the side with brass screws to allow adjustment. May not come up to metrology grade but was more than capable for data logging use.
TERRA Operative:
My plan is to use two blocks of brass and drill and tap them so I can bolt them to each other with the flat resistance wire clamped between.
I'll take a look at sourcing some Magnanin, I'll see what I can find in the 1-2mm diameter range to help prevent self heating by providing a decent amount of surface area.
Does anyone know where to get Magnanin as a flat wire or ribbon?
coppice:
--- Quote from: TERRA Operative on December 09, 2019, 12:41:20 pm ---My plan is to use two blocks of brass and drill and tap them so I can bolt them to each other with the flat resistance wire clamped between.
--- End quote ---
Now you will have some of the current flowing through the brass, and its temperature coefficient is awful. The coefficient varies somewhat with the type of brass, but its not a whole lot better than copper. You really want to electrically isolate the wire from the brass, even though that will spoil the heat conduction.
TERRA Operative:
How would you suggest I electrically connect multiple strands of Kanthal to binding posts without using brass blocks?
Is there another metal I should look at?
perdrix:
--- Quote from: pwlps on December 06, 2019, 10:32:28 am ---For high currents and high accuracy a DCCT might actually be cheaper ...
--- End quote ---
OK ignorance showing - what's a DCCT?
David
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