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Made an adjustable motor dynamometer (Patreon)

Published:
2018-03-24 14:36:27
Imported:
2026-06
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Content

for repeatable load testing in the next CNC episode. To give the BLDC servo a chance I needed it to be switchable while running.

It's super simple too: The rotary switch shunts the two stepper motor phases with equal resistances between 4 and 0 ohm, the on/off switch just disconnects everything.

Files

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20180324 152523

Comments

Holger P Kleinert

Haha. I had 2 stepper motors mounted to a fronpanel and connected together. So whenever you turn one the other one would also turn. I gave that every visitor to play with and EVERYONE was looking for the belt at first. So funny !

Kean

Nice and simple

marcoreps
>>11033335

I knew that that was possible somewhere in the back of my head, but I've never actually tried it. Until now 🤗 Very satisfying

Joseph Tavora

Assuming the poor stepper can cope, this would make a great torture test rig for cordless drills.

Joseph Tavora

Could you measure the voltage to track the performance as well perhaps?

marcoreps
>>11050950

Yes, I think that would actually make it a dynamometer, like this without measurement it is just an adjustable load

marcoreps
>>11050936

Might need a bigger one, not because it can't take it but because it skips steps at higher forces