Re: [CAD_CAM_EDM_DRO] Bridgeport motor question

On Saturday 03 January 2004 10:23, rivet3man wrote:

> I'm preparing a series1 (BOSS) Bridgeport to fit PC-based controls.
> The main spindle motor is a US motors 2hp, & though the rating plate
> gives a connection diagrams (9 wire) for 220 and 415 volts there are
> actually just the 3 wires coming from the coils and I believe it was
> set for high voltage. I want to run it from 240Volts via an invertor.

So .. this motor has a 220V layout connection available? .. then you are home
and dry, Just select the 220V diagram as per the manufacturers
instructions and thats it

> I'm going to see if I can unearth the actual winding terminations,
> but
> if I get too far out of my depth it'll be off to the rewind shop on
> Monday for them to do it.
> My question is, as understand it the US style 9-wire dual voltage
> motor is star connected for both voltages.

Probably, but who cares .. it has a 220V tapping and that will be close
enough ... use that. it doesnt matter whether its star, delta or bavarian
beaver cheese, its the right voltage, thats all you need to know.

> More usual here in the UK
> is 6 wire, with star connection for high volts & delta for low. If it
> looks easier to reconnect this motor for delta than to unearth all
> the
> terminations to parallel the windings, will that be just as good?

I'm not sure what you mean .. the whole idea is to end up with a 220V rated
motor, one way or another. as the motor has a diagram of how to do that, then
you are home and dry .. no?

(Officially the UK went 220V like the rest of europe some years ago, but the
tolerance on the supply is so large, its still roughtly 240V anyway .. but
officially, its a 220V supply we have here in the UK)

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