tino
Junior Member
Posts: 71
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Post by tino on Sept 6, 2014 17:14:46 GMT
Q Which h-bridges are compatible with AMC1280USB board?
Any recommendation for a budget 12V 25A h-bridge?
Atb. Tino.
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tino
Junior Member
Posts: 71
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Post by tino on Sept 9, 2014 12:20:01 GMT
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Post by tronicgr on Sept 9, 2014 22:17:04 GMT
Q Which h-bridges are compatible with AMC1280USB board? Any recommendation for a budget 12V 25A h-bridge? Atb. Tino. Have a look at this one. I used it before with no issues with DC motors. www.pololu.com/product/758Thanos
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Post by Trip Rodriguez on Sept 10, 2014 7:13:59 GMT
Tino (and anyone else looking at the motors he found), I sent a message to Ali Express about those motors asking why the specs were listed as the same for both the 150W and 180W versions. This was the reply:
It is the same motor. Some factory named 150W. Some factory named 180W
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tino
Junior Member
Posts: 71
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Post by tino on Sept 10, 2014 21:11:01 GMT
Q Which h-bridges are compatible with AMC1280USB board? Any recommendation for a budget 12V 25A h-bridge? Atb. Tino. Have a look at this one. I used it before with no issues with DC motors. www.pololu.com/product/758Thanos Thanks Thanos, This seems like a good and proven driver and I plan to have proper cpu cooler on them, to be on the safe side. How good is software compatibility with polou? Are there any problems with Ian's BFF and simtools? I'd like to be able to use as much 6dof supported software as possible
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tino
Junior Member
Posts: 71
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Post by tino on Sept 10, 2014 21:18:46 GMT
Tino (and anyone else looking at the motors he found), I sent a message to Ali Express about those motors asking why the specs were listed as the same for both the 150W and 180W versions. This was the reply: It is the same motor. Some factory named 150W. Some factory named 180W Hi triprodriguez, I got a similar answer; "150W and 180W motor have same charachteristics, and have same price. " I hope other characteristics are OK though, They should have 14Nm at 120RPM, I plan to further reduce the speed 3X to 40RPM, (I'll probably be playing with ratios from 2.5:1 to 3:1) which should give 42NM torque. With 10cm lever each motor should lift 42Kg or 84Kg with 5cm lever. I plan to have very light platform (100-110) kg for use with Oculus DK2
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Post by tronicgr on Sept 10, 2014 21:42:00 GMT
Thanks Thanos, This seems like a good and proven driver and I plan to have proper cpu cooler on them, to be on the safe side. How good is software compatibility with polou? Are there any problems with Ian's BFF and simtools? I'd like to be able to use as much 6dof supported software as possible From testing those motor drivers: www.youtube.com/watch?v=jAF35MdWzDEwww.youtube.com/watch?v=5dXl-CTJuB8One thing I noticed with the Pololu driver, is that it lets regenerative current flow back to the power supply. I had instances where the PSU (normal computer PSU) was tripping its automatic fuse, during change of direction under load. Its better to have a car battery connected in parallel to avoid this issue. The motor drive has nothing to do with the software. It just re-directs the power from the power supply to the motor under the controller instructions... Thanks Thanos
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tino
Junior Member
Posts: 71
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Post by tino on Sept 11, 2014 13:41:01 GMT
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Post by Trip Rodriguez on Sept 11, 2014 14:20:57 GMT
I plan to have very light platform (100-110) kg for use with Oculus DK2 Tino is that including you or the platform empty? My Platform weighs less than that without me in it but I weigh 77KG myself. Have you ordered the motors yet? I'm agonizing over the decision between trying these motors and hope they are powerful enough or buy much more expensive servo motors on my credit card. I don't think I can hold off ordering very long as I'm very excited to get this thing moving but it would be a shame for both of us to buy the same motors and then both find out they are too weak. Let me know what kind of timeline until you will have the motors tested with load.
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tino
Junior Member
Posts: 71
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Post by tino on Sept 11, 2014 15:54:23 GMT
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Post by tronicgr on Sept 11, 2014 18:20:30 GMT
I was talking about AMC1280USB being compatible with both x-sim and Ian's BFF software for the 6DOF support. What is going to be used for motors/motor driver etc is not related to the software. Thanos
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tino
Junior Member
Posts: 71
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Post by tino on Sept 11, 2014 19:41:41 GMT
I was talking about AMC1280USB being compatible with both x-sim and Ian's BFF software for the 6DOF support. What is going to be used for motors/motor driver etc is not related to the software. Thanos Thank you for confirming Thanos. I think your board is the best and easiest way get 6dof working ! Car battery should also help with any sudden amp spikes, and as you said, it will help with regenerative current. Also pololu employees think that thankfully you won't get a lot of energy from regenerative braking; "Our high-power motor controllers have some regenerative braking as a side effect of variable braking, but it's not something you get much practical energy out of." forum.pololu.com/viewtopic.php?f=15&t=3687forum.pololu.com/viewtopic.php?f=15&t=3025All the best. Tino.
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marko
New Member
Posts: 5
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Post by marko on Nov 10, 2014 5:44:02 GMT
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Post by thecure on Nov 11, 2014 20:51:30 GMT
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