Re: [CAD_CAM_EDM_DRO] Re: Bridgeport motor question

rivet3man wrote:

>>
>>
>
>No, you missed the vital line above 'there are actually just the 3
>wires coming from the coils'
>

Yes, that is certainly a problem. If the wires are not accessible
anywhere else
after you pull the cover off the motor, you really can't do much with it.
If you only have 3 wires, you can't switch it between Wye and Delta.

>>
>>
>The point was, as the terminations described on the rating plate
>aren't available, will connecting a 9-wire motor in 'series delta' be
>just as good as 'parallel star'. If it is, why has the US practice of
>9-wire motors arisen (just out of curiosity?)?
>
>

Now I'm confused. You say you have only 3 wires. And, no, the 9-wire
motor is star (wye) all the time, because of the buried star connection of
one of the winding halves. You need a 12-wire motor to get both high/low
and delta/star connections. (A 6-wire motor can be set for delta or wye,
which gives a 1.73:1 voltage ratio. The series/parallel setup on 9-wire
motors gives a 2:1 voltage ratio.)

>I thought UK mains was now officially 230V, although in name only,
>little has really changed. Here it usually measures around 240/242
>Volts.
>
>

Yup, unifying you with us, 242 - 245 V, except for the frequency issue.

Jon