Motor recommendations

This topic has 6 replies, 6 voices, and was last updated 11 March 2017 at 09:06 by Ian S C.

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10 March 2017 at 07:35 #25127
Nick Taylor 2
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@nicktaylor2
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10 March 2017 at 07:35 #288050
Nick Taylor 2
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@nicktaylor2
Morning all,

I have two older machines (a shaper and a pillar drill) that whilst mechanically very serviceable are being let down by loud and rough running old single phase motors. What makes old single phase motors so ruddy loud? They can't of been this bad when the left the factory!

Now I know that the obvious answer if I want quiet running would be to fit three phase with inverter but I would like to keep them on single phase.

Has anyone purchased a single phase (about 0.5hp) motor recently who can make a recommendation?
10 March 2017 at 07:57 #288051
David Colwill
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@davidcolwill19261
Hi Nick,

I've had my fair share of old rumbly motors. In many cases it is the bearings, not surprising really when you think about it. Replacing the bearings can often be the easiest and cheapest way to go as you don't have to redo any of the mechanical work. That said and bearings aside there are still some very loud motors about!

David
10 March 2017 at 07:59 #288052
john carruthers
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@johncarruthers46255
If a noisy motor fitted vertically quietens down when horizontal it's a good sign the bearings are on their way out.
10 March 2017 at 10:51 #288077
Johan van Zanten
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@johanvanzanten
Hi Nick,

Single phase motors make a humming noise, wich is different from bearing noise. This is caused by the way they work and is called cogging noise. That's why manufacturers like Brooks mount their motors in silent rubbers. Two phase motors ( with a running capacitor ) behave a little better at this point. 3 phase motors are quiet. But all motors can have bad bearings wich makes a rumbling sound.

Best regards, Johan.
10 March 2017 at 11:51 #288095
peak4
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@peak4
I've just bought a couple off ebay from This Seller , both 1/2 HP

One single phase 2 pole and one 3 phase 4 pole to run my Dore Westbury of an inverter I already have in stock.

I've only used the high speed one so far on my Clarkson T&C Grinder, but it seems fine. It is a bit noisier than I'd like, but I think that's probably due to the speed of the various bits whirring round than the motor itself, which was fairly quiet without the drive belt on.

If Owen isn't listing what you're after, drop him an ebay message, as he has some other stock left from a previous business venture, and only lists a few at a time.

No connection with the guy, other than as a satisfied customer.

Regards

Bill
11 March 2017 at 09:06 #288231
Ian S C
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@iansc
A good, but noisy motor can sometimes be quietened by using rubber or similar isolation, so that the motor is physically isolated from from what it is mounted on. If the motor is mounted on a box like cabinet, maybe a lathe bench this can form a sounding board, and amplify the 50Hz buzz that can be present.

Ian S C
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