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| Universal Motor Speed Controller |
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| made2hack:
Hi All, I have a miter saw (230VAC / 50Hz / 2000W) that runs at 5000 RPM. I want to make it run at 2500 RPM. It is a Universal Motor. I'm not sure what to search for on Google, what terms or topology to use. Too much confusion pops up and forum posts (elsewhere) that I'm having trouble navigating the results. Below is an image of what I want to achieve. I've abstracted the motor in a black box in the event that there is a solution that I can implement externally (without modifying the internals of the electronics). However, you can if you think it is easier to recommend modifications to the internal electronics as well. I just assumed it might be easier externally. But I don't know. Thanks for you input, P.S: Aside from the technical aspects, what effects will this have on the motor? Will halving the speed double the current? Or does the motor not necessarily maintain torque? Will torque just be halved if I halve the RPMs? |
| Benta:
You need to post more info. What electronics are in the motor, if any? Does it have tacho feedback? Photos would be a great thing. |
| drussell:
Are you trying to do something like this? RIDGID abrasive cut off saw converted to dry cut. Maybe. --- Quote from: made2hack on November 08, 2018, 09:47:03 am ---P.S: Aside from the technical aspects, what effects will this have on the motor? Will halving the speed double the current? Or does the motor not necessarily maintain torque? Will torque just be halved if I halve the RPMs? --- End quote --- There are several issues with trying to slow down a universal motor like that. Yes, you will need some kind of tachometer feedback and controller to maintain reasonable torque, etc. |
| 6PTsocket:
Before you go all high tech, try a simple triac speed controller. It may be all that you need. People slow down routers with them all the time. If loss of torque gets to be a problem, a pulse width controller is better at lower speeds. If you just want to knock off a bunch of speed you can just stick a diode in series with the motor and get rid of half the sine wave. Try a simple solution first. Sent from my SM-G900V using Tapatalk |
| Kalin:
If all you want is half speed ad are ok with losing power a single diode in series with either line is the way of go. I have seen it don in many different low power AC devices with a universal motor(ie: leaf blower, vacuum and a oscillating tool) Sent from my SM-G965W using Tapatalk |
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