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| Slowing an electric motor down |
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| jiihoo:
Hi Lykle, A motor is a more difficult load for the dimmer than an incandescent lamp. You should have a "fan speed controller" or "universal dimmer" which both are meant to control motors. I higher rated light dimmer would probably work, though, but no guarantees... If you don't need variable speed and could use belts and pulleys in your vibratory tumbler design, consider the pulleys and belt approach suggested by John earlier. Some old threads that might interest you if you decide to go this route: http://madmodder.net/index.php?topic=1903.0 http://madmodder.net/index.php?topic=1374.20 And at least Chronos has the belt material http://www.chronos.ltd.uk/acatalog/Engineering_Menu_Plastic_Transmission_Belt_46.html Is 3000 RPM too much for a vibratory tumbler? Many of the small-to-medium sized vibratory tumblers seem to use 3000 RPM. I can definitely see why the speed control would be nice as you'd get to test different speeds and see what effect it has, though... Cheers, Jari P.S. Can we have a build thread of your project, please :drool: . |
| David Jupp:
Difficult to know without seeing the motor. May be slow to start because of reduced power via dimmer - eventually it can pick up enough speed and run at normal speed, I could believe that if it was an induction motor. If you can't find brushes, maybe it isn't a brush motor... |
| John Hill:
I expect this tumbler will be left to run 24 hours a day? If so I suggest not trying to slow the motor as that will likely cause it to run hotter than intended (if for no other reason than its fan will be running slow). My suggestion is use a belt and pulley to slow it down which will also give you increased torque to turn your tumbler. |
| Lykle:
Hi all, Well, I went through my old electric bin again and found a motor and controller for a juicer. Now the juicer runs at 6000 rpm or so, but I wired the controller to my motor and it slowed it down nicely. Not enough yet, but I can replace the 100K variable resistor for a 200K and it might just work. The reason I think I need to slow it down is that when the system starts up, there is a sweet spot where it vibrates nicely in harmony, it feels in sync. Then the motor goes faster and I loose it again and the whole system rattles hard. But I think I need to run it as it is for a while with material in it. Just to see what will happen with it. But finding the right abrasive material is a totally different challenge! I have not been able to find anybody who has the abrasive material here in Cyprus and to order a 25kg bag from mainland Europe is going to take a lot of dosh, that I don't have. So I was thinking of just using sand? The main purpose is the deburr and clean up stainless steel parts for my Danger Toys. Just sand with a little bit of water and some polishing compound. Any better solutions or ideas? Build thread? I can start a thread and post a few pics but most of the construction is done and glued in. So it won't be a build thread, more of a debug thread. I will dive into the workshop now and shoot a few pics. Lykle |
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