The attached photo is of the last time but this time it's not much different. I've resoldered the posts, cleaned everything up including polishing the posts and installed a new connector. With only a few minutes running the connector is already quite hot.
So I'm guessing the problem is in one of the middle layers of the PC board and either the fibreglass is already so carboned up that it's conducting or the trace for the one winding is pretty well toast and has a high resistance therefore acting like a toaster. 8-( So it's a 1200 oz-in stepper motor with a 60V power supply moving the knee up and down using a 3:1 reduction to the 0.25" pitch screw. Any suggestions for an alternative drive? Really don't want to get another Gecko at $201.65 Cdn. Since I still have two extra HP_UHU drives and 2 STMBLs going to a DC Servo motor wouldn't be any more expensive other than the work of mounting it and maybe increasing the reduction ratio. So maybe I should just look for an AC or DC Servo motor. John
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