Gallery, Projects and General > How do I??
running single phase motor backwards
Darren:
Brilliant, you were lucky you could turn it around.... :clap:
Dave, perhaps you could help me solve a little problem that I can't seem to fathom.
My drill motor when switched on from cold spins up fine. If it's switched off, allowed to come to a stop and switched back on again it just hums.
But if you leave it off for 10 seconds or more it will spin up fine.
I originally suspected the start cap, changed it and there was no difference. So I changed it again for another known good one and still no difference.
I'm lost as to what it could be. Not a major problem, just a slight inconvenience.
Any ideas?
Bluechip:
Darren
If it's a motor with a start switch, I would do this:
Next time the sod acts the goat, while it's a-buzzin, give the chuck a twist.
If it starts, it's yer start circuit. So:
Caps are usually not the culprit, in my experience, go for the centrifugal doings.
If you ever have a shufti at these cheapskate devices, you will see an unlikely arrangement of bits of bent metal and a couple of springs.
These are VERY prone to temporarily jamming up due to fretting rust on the bearing surfaces. If you find this, clean 'em off and lube with a bit of 3in1 on a matchsick.
T'other source of grief are the contacts, any 'pip & crater' they aren't usually fixable. There ain't a lot of contact alloy, if your're down to base metal, you are done for. Look at the connections on the paxolin plate that all the things attach to. Particularly the brass 'rivets' that take the phossy contact springs, I have seen a number where there have been poor grip leading to heat cycling and looseness.
Another idea I have used, good if you suspect the switch is sticking, is to get a rubber mallet, and administer a sharp wallop or two.
Or more if you're feeling particularly narky..
If it always runs OK afterwards, the windings are almost certainly OK. A dead winding is usually forever, not just for Christmas.
Just look for poor/loose push-ons etc. usual things that screw up any elec. device.
Bout it really
Dave BC
Edit No it ain't about it! Check the sliding bush on the motor shaft. ::)
Also, when the motor stops, you can usually hear the switch click, followed by a quiet 'hiss' as the motor stops. Does it do that?
Darren:
Blimey that was comprehensive.... :bow:
When it hums you can spin it up by hand
"Also, when the motor stops, you can usually hear the switch click, followed by a quiet 'hiss' as the motor stops. Does it do that?"
Yep does that, quite a good positive "click" too and the hiss
The rest I'll have to check. It's been like this for 10yrs or more, never got any worse or better, rain or shine.
Bluechip:
Darren
Sling it out. Replace with a 1000cc JAP vee-twin ..
Much more fun :D
Dave BC
Darren:
One of my mates rides one of these.....SP1 when he's not riding his full power Hayabusa
when he's not riding his full power Hayabusa
http://www.extremesportclips.com/video/2054/A-Hyabusa-Over-240-MPH.html
And he plans to turbo it next year.....he's 50yrs old btw.....
Never too old as they say......I really miss not having a bike....this was mine....no stone unturned, 140bhp at the back wheel by 5,000 rpm 170mph....
If you know anything about bikes you'll also know that is far from factory spec..... :thumbup:
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