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@dArsonval - my pleasure, will hopefully update this again soon. @itsmoked - Thanks for the reply; could you please clarify (maybe using a link or sketch) how I can implement the oil-less air compressor close to the brushes? I have initially used 10Ω current-measuring resistor with a 100kΩ...

Update: I have used a setup similar to the one proposed by Gunnar and it worked quite nicely. I have used copper wires to make a rope with two sides wrapped in a circle to make a hook. One side is attached using nylon washer and bolt to the base (isolated) and the other side attached to a...

Update: As @Skogsgurra suggested, I have wires to see if that make any difference in terms of improving the electrical circuit and it seems that the wires improve the electrical circuit significantly and I no longer see those open-circuit moments. I will look into a permanent solution so I can...

@dArsonval thank you for the interest and the suggestions, I have used the copper brushes and copper discs before and that led to the sliprings losing 2 mm in diameter due to wear in a period of 20 days of and hence the need for the replacement. Phosphor bronze so far they are the best in terms...

To clarify, the "contact" defined as a capacitor with a resistor is the simplified electrical representation of my lubricant.

Attached is the electrical representation of my system including the limiting-current resistor and the current measuring resistor, and the "contact" which includes the slipring/brushes 2x and two electrode contact which I am interested in measuring. I am interested in the voltage across the...

@edison123 I am measuring the voltages using the differential input of DAQ and a current measuring resistor for the current.

@waross - Can you give me some ideas with regards to the non-contact solutions? @Skogsgurra - Those are applicable and thanks for the suggestions, the current is set below 200 uA and voltage also doesnt exceed 20V. @edison123 - Just simple voltage measurement nothing really related to the...

I have two phosphor bronze PB1 sliprings of 60 mm in diameter and 10 mm in thickness and two brushes of carbon graphite with 8 mm in thickness. I am interested in applying a voltage from one of the slipring/brushes contacts, through the shaft (and load) and then collect it from the other...