I have mainly been setting up the CNC machine every avaliable time to cut out 3 plywood battery modules at a time. I have been able to cut out 3 plywood holders in just under 30 minutes, which should make for a total CNC time of 9 hours!
While I let the CNC router cut out all the battery modules, I worked on trying to get the rotor running straighter. Currently it has a fairly large wobble to it which will be causing rubbing of the stator and rotor.
The physics of how a weld bead contracts as it cools, pulling the 2 metals it is joining slightly closer together is what caused the warping to begin with. To correct this, opposing weld areas to the offset should help pull the rotor back into straightness. I welded the top joining piece of the rotor housing and tried to correct the balance then, but it may have only made it worse.
This is what the whole assembly is looking like at the moment.
You can see the wobble in the rotor in the lathe running at a slow speed:
This week I have been trying to crack on with getting the temperature monitoring circuitry together.
I have decided to use standard 20 x 4 LCD displays with each Arduino, which should be able to display all cell data nicely. However I have been having trouble getting data to print onto the LCD screen. I think this might have something to do with the contrast pin not being tuned correctly. I will try wiring in a potentiometer next week.
This is the proper wiring diagram which I will follow.
I have had success with the 10K thermistors getting accurate temperature measurements using the equations provided online for the temperature resistance curve of the thermistors.
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