Designing a rotating heated disc

[braclark]

I'm trying to design a heated disc that rotates slowly and I have a couple questions. The heater elements are to be mounted on the rotating disc and it is desired that a slip ring will supply the 120v 10A power for them.

Does this disc have to be "Hard wired" grounded or can I use a slip ring contact to ground it?
Are there any other methods (besides IR) of getting the temperature back to the controller since most slip rings aren't compatable with thermocouples?

 

[nbucska]

If you want to play safe you may use an insulation transformer.

You can mount the temp sensor on the moving part and
couple its output out by IR -- it is really the simplest. <nbucska@pcperipherals.com>

 

[schick]

In my experience, &quot;fire rods&quot; are forgiving enough that if it is rotating slowly you shouldn't see problems passing through a slip ring.

How hot are you getting?? Can you mount an isolated box with a temp controler to the rotating portion?? This way your thermocouple doesn't have to pass through the slip ring, just the temp signal.

 

[fareast]

Why not use induction heating ?