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2023-11: Warosu is now out of extended maintenance.

/diy/ - Do It Yourself

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238720 No.238720 [Reply] [Original]

I have a "skm385-2073" electric motor from a hairdryer that I want to run off or household electric (115v) The original setup inside the hairdryer had the heating coil hooked in series with the motor.

I don't want the heating coil hooked up to this. I have tons of PCB parts, dimmer switches, ect I can use. What is the best way to wire this motor up so it won't burn up? Here's the specs,

http://arhivmolotok.com/motor_skm3852073_vykonn-1530508594.html
Operating Range: 9v - 24v
Optimal: 20v
No Load: 18,300RPM at 0.21A
Max Efficiency: 15,300RPM, 1.05A, 91.4 torque, output, 14.3W
Stall: 68% efficiency, 5.4A, 550 torque

Its use will be for the bellows of a small forge I'm making. Incorporating the dimmer switch would be nice.

>> No.238725

i suggest you use ~24V transformer or laptop power supply and LM338 adjustable eegulator

here is the datasheet
http://www.ti.com/lit/ds/symlink/lm138.pdf

i made my lab power supply using that regulator.

and since its its adjustable it means it adjusts speed of the motor.

>> No.238726

>>238720
FYI, double check the volts from the wall and it is exactly 120v.

>>238725
lol I was just rummaging through my box of transformers when I saw your post pop up.

I just realized something, I have a stack of PC PSUs too. I'll see if I have any LM338's. Then again I may have an adapter here somewhere that might be perfect for it.

Thanks.

>> No.238727

Use a step-down transformer.

>> No.238733
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238733

>>238720
My mom's a beautician and I end up working on her hairdryers from time to time.There's not much too them. I kind of feel like the easiest way to do this would be to just get an old extension cord and just wire the dimmer switch on say the white wire of the cord and then connect the bare ends of the extension cord to the terminals on the motor. It seems like that would give you really good speed control and if something did burn out it seems like it would be the dimmer switch before the motor. I think the ones they sell at places like lowes are only around 600 watt switches. That would probably be the way I would wire it up anyways. Good luck OP

[motor]======_dimmer_ ======plug

>> No.238739

>>238733
I was going to do that, but I made sure to test the dimmer switch's output and it is WAY too high for the motor to use. Right now I'm about to test some old AC/DC adapters.

.....I'm in luck! I found a 15v AC/DC adapter that is outputting a steady 20VDC and it works perfectly with the motor.

>> No.238742
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238742

OP here.

Since the 15.6v AC/DC adapter from an old scanner works so well, I'll just be using it. It seems I don't have anything good to use on the output side to properly adjust the motor speed, but since it's only for a forge, I suppose it doesn't matter.

Thank you, everyone for your suggestions! I would have been using them or even winding up my own transformer had I not found this adapter.

pic related

/thread

>> No.238744
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[ERROR]

So I have searched the interwebs for plans for a dolly like shown in the picture, but they ll pretty much tell me to go buy plans or buy my dolly. So any /diy/ers up to helping make a plan for one?
Safety is necessary but cheap is best!