Stop an universal motor electronically
Stop an universal motor electronically
(OP)
Hello everybody!
I have a question which could seems easy for some but which gives me hard times.
I want to know how to slow down then cut the supply of an universal motor (230VAC, 16A) and all of that electronically because this system will be in a tool and will be activated by an hypothetical sensor(then driven by tension or intensity).
If it's not clear please ask me.
I have a question which could seems easy for some but which gives me hard times.
I want to know how to slow down then cut the supply of an universal motor (230VAC, 16A) and all of that electronically because this system will be in a tool and will be activated by an hypothetical sensor(then driven by tension or intensity).
If it's not clear please ask me.





RE: Stop an universal motor electronically
RE: Stop an universal motor electronically
Most people just use an electro-magnetic brake. Is there some reason why that won't work for you, or is there a particular reason why you are using a Universal motor? A PMDC motor might be a better choice if you want 2 or 4 quadrant operation in a small motor package. Jury rigging something to brake a UM may end up costing you a lot more.
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RE: Stop an universal motor electronically
http://www.freepatentsonline.com/3673481.html
Looks like the patent was filed for a company called Eltra in Toledo OH, who apparently became a part of Honeywell. Don't know what that means for you, but take a look at the pdf file, it contains a schematic.
I'm just sayin'...
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Stop an universal motor electronically
RE: Stop an universal motor electronically
@BrianE22:I've already seen some but I found it to easy or maybe too schematic.
@Jraef:thanks for this one. It's a really good one with patent which is curious because the circuit looks pretty easy.
But I just have a doubt about the field coil.
Is it representing the stator or its just coil for interferences?
@Operahouse:Yes its a big drill then it can even have more than 16A!
Why do you think that this schema won't help?
Sound fitting for me, I should try it I think...
RE: Stop an universal motor electronically
RE: Stop an universal motor electronically
RE: Stop an universal motor electronically
Ah ok i see, but its a 2 wires, a drill.
But I still think that I can put an electronic system.
Oh sorry I have to rectify the normal intensity is about 8.5A and not 16 for a power of 1500W.
RE: Stop an universal motor electronically
I have found a way to slow down and then cut the motor.
It's a patent made in 1972 (then not yesterday).
It's just the first step because the guy used two switches (on,off) and put one RC and the stator in parallel and followed by a rectifier which work only when the switches are off to put DC in the brushes of the rotor.
I'll try it but I don't want to break it because for the sizing of the components I'll try it in a haphazardly way, if somebody got some hints?
Later i will replace the switches by some electronicals commutations componants (Mos of bipolar).