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« on: March 16, 2010, 02:04:25 PM »
I have never found the specs for either the Superior or the Sigma motor but I did come across the specs for a similar stepper and I used these to choose my power supply.
Size 42, 7.1 Phase Current, Inductance 2.0mH, Maximum Voltage of 140V.
On my G212's I limited the current to 6.5A (just to be safe).
For a heatsink, I mounted the Gecko's to a 1/2" aluminum plate and then mounted that plate to the existing BPII door/heatsink. I used heat transfer paste between all surfaces.
I also enabled the AUTO CURRENT REDUCTION on the Gecko's.
My motors are 8-wire and are wired series. My motors never are hot to the touch. I would guess they never get above 105degF and usually stay below 92-95deg.
I was reading roughly 54VDC using the original BP supply and could hear the steppers running "soggy". My rapids were a lot slower than what they should have been. When I decided to install a new supply I wanted something that had enough current for 4 axis (in case I ever got around to setting up a 4th). I had read on one of these forums that your could get higher rapids by going to a higher voltage supply as long as you didn't go over the motors max voltage or run into a heating issue. With this in mind I decided to go as high as I could but stay below the max voltage the Gecko's could handle. With the amps I needed and the voltage I was going for, that supply was the only one that fit.
I immediately heard the difference with the new supply. I doubled my rapids and my steppers sound much tighter.
I am still working on an easy/clean/cheap method to control spindle speed but for now we do it manually.
Hope this helps.
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