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Post by nopilotyet on Sept 25, 2014 19:26:19 GMT
hello all
Jumping in to the 6DOF abyss! Have 6 real torquey 3 phase BLDC motors (550 in/lb) 24v wheel chair motors.
Don't quite have enough torque for direct drive (except with 2" to 3" levers). Probably will require 5 to 10 reduction gear. Ordered a Chinese BLDC drive and 40A power supply. Wife is already starting to look at me funny!
Thanks to thanos for responding. I know you are very busy.
Eric
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Post by nopilotyet on Sept 25, 2014 19:56:53 GMT
I mean abyss!
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Post by tronicgr on Sept 25, 2014 20:43:33 GMT
You can edit your posts...  |
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Post by tronicgr on Sept 25, 2014 20:46:26 GMT
hello all Jumping in to the 6DOF abyss! Have 6 real torquey 3 phase BLDC motors (550 in/lb) 24v wheel chair motors. Don't quite have enough torque for direct drive (except with 2" to 3" levers). Probably will require 5 to 10 reduction gear. Ordered a Chinese BLDC drive and 40A power supply. Wife is already starting to look at me funny! Thanks to thanos for responding. I know you are very busy. Eric No problem, share some details or photos about the build so we can advice you. I'd really like to know the BLDC drive input interface, is it analog voltage? BI directional or uni-directional? Thanks |
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Post by nopilotyet on Sept 25, 2014 21:06:46 GMT
The dir input is 5v. The Thanos board puts out a 24 v DIR out put. Thinking a simple resistor divider network of a 19k + a 5k should emit 5v DIR to the drive. Speed input is 0-5v analog. Gonna play with this on the bench to observe behavior.
Eric
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Post by tronicgr on Sept 25, 2014 22:52:46 GMT
The 6DOF ext board outputs are available as 0-5V analog speed and 5v digital for direction as well. See this picture that has the voltages marked on the pins: www.dropbox.com/s/i1445jcqemx7tow/6DOFEXTV3_PCB_test_points.gif?dl=0The pin rows between the 595 and 2981 chips are the same outputs but 5volts. No need for additional conversion or resistor dividers. Thanks Thanos |
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Post by nopilotyet on Sept 25, 2014 23:17:01 GMT
Wow you guys are good!
Eric
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Post by nopilotyet on Dec 9, 2014 22:57:34 GMT
Got my gear boxes in. They're 5:1 worm drive 2-1/2 hp. Got them new, but since only RT hand, I'll have to switch 3 of them to Left hand drive. Only 1 output shaft, so planning to put a fine tooth gear on the output close to the case for feedback. Got 12 coming. Machine shop to bore them for fit on output shafts. All 6 BLDC drives and PWR supplies are in. I hope 2500 in/ lbs of torque is enough or gonna have to shorten up levers from the proposed 6" of throw
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Post by stevant on Dec 9, 2014 23:06:41 GMT
Thanos is a wealth of info!!!!!
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Post by nopilotyet on Dec 9, 2014 23:12:48 GMT
Yup. Wish I could score the $100 off special, but the wife would probably kill me!
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Post by stevant on Dec 9, 2014 23:20:25 GMT
One piece at a time, you'll get there!!
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Post by tronicgr on Dec 10, 2014 6:39:18 GMT
Yup. Wish I could score the $100 off special, but the wife would probably kill me! Well, the offer is valid until the end of 2014... now you know what to ask for Christmas  I should leave this in the shoutbox, not that I wish to have more orders right now (have to fulfill about 15 so far since Cyber Monday...  ) Thanks Thanos |
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