Resilient motor mountings/bearings

[AJWParticipant @ajw]

[AJWParticipant @ajw]

I seem to remember some folk have had problems with resilient motor mountings and/or the plain bearings.

I have an old Delco motor (1/6hp) which has been deemed faulty as it won't start – centrifugal switch as fine once spun up.

It has the rubber resilient mountings and bearings are in excellent condition seems a shame to scrap but that's where it's going if no one wants it. As in classifieds.

Alan

[duncan webster 1Participant @duncanwebster1]

If you're ok with working with mains electricity, it is easy enough to rig up a system of buttons/relays to make it run without the centrifugal switch. Might not be worth the effort, but I could sketch out the circuit if it helped.

[Clive FosterParticipant @clivefoster55965]

Further to what Duncan says.

A time delay relay in the start winding feed is an easy way to get it going if the centrifugal switch is dead. A couple of seconds before the relay turns off power to the start winding should do it.

Time delay relays are bog standard and not silly expensive components these days. DIN Rail mounting ones from "proper" UK suppliers start around £20 + VAT, imports via E-Bay from about half that. If you aren't an electrical / electronics guy with a big box of stuff its hard to beat the price by buying bits and making something.

However when I did similar for a 3 hp motor with no internal centrifugal switch I just used a monster pushbutton switch alongside the ordinary DOL start button to bring the start winding in with a two finger "count 1 & 2 & 3, she's off" two finger push. Simples if not strictly kosher. Nowadays I'd get a time delay relay and do it properly but 30 + years back such things weren't affordable.

Clive

[AJWParticipant @ajw]

Thanks for the suggestions/offers guys.

I did arrange a time delay relay on my compressor so it could run up to speed while it exhausted to atmosphere, then came under load, worked well and I realise that similar could be applied to this motor but this motor really is ''surplus' to requirements and I just thought I would offer it hear as I had read some post regarding bearings and resilient mountings.

Alan

[john fletcher 1Participant @johnfletcher1]

Hello Alan I think the start winding is open circuit. What you did when you "spun it up", was to run the motor on the run winding only. For a simple test try flicking the shaft in a different direction (twice, both directions) and if runs in both direction the start winding is open circuit some where. Did you hear the centrifugal switch click as the motor came to a halt ?. Have you got an multi meter with an OHMS scale. If you carefully take the motor apart you may locate the broken wire, it will be thin when compared to the run and have a much higher resistance 50/70 ohms. John

[AJWParticipant @ajw]

John, to be quite honest it's been knocking about the workshop for a long time now and I can remember spinning it to get it going (only one direction though, never tried it the other way) and the drill was used like that for a while.

Your right it could be an open circuit winding although I always assumed, rightly or wrongly, that the centrifugal switch wasn't closing properly at rest.

It is only being offered as spares/repair on the off chance it might be useful to someone, I now have no use for it.

Alan

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