Re: Recovering 2.5 hp motor for phase convertor (long story with pictures)


"DoN. Nichols" <dnichols@xxxxxxxxxxx> wrote in message
news:dcrskv$6nt$1@xxxxxxxxxxxxxxxxxxxx
> In article <Nv2dnVTO7eZZam3fRVn-hA@xxxxxxxxxxx>,
> Robert Swinney <judybob@xxxxxxxxxxx> wrote:
>>
>>"Christopher Tidy" <cdt22NOSPAM@xxxxxxxxxxxxxx> wrote in message
>>news:42F0CABB.2060905@xxxxxxxxxxxxxxxxx
>
> [ ... ]
>
>>> What are the nine leads for? Most of the three phase motors I've seen in
>>> the UK either have three leads (permanent star connection) or six leads
>>> (both ends of each winding brought out, so it can be connected star or
>>> delta). I also saw a six lead motor which was dual wound (i.e., two
>>> completely separate windings, a four pole and a six pole, both with
>>> permanent star connections).
>>
>>The 9 lead arrangement is more common in the U.S. It provides a method of
>>connecting internal coil groups either in series or parallel to achieve
>>dual
>>voltage operation.
>
> In particular, picture this:
>
> 1) Three windings for the lower voltage of two differing by a
> factor of two. These are permanently connected in Wye.
>
> three leads to the outside world.
>
> 2) Three more windings of the same voltage, but totally separate
> so both ends of each are brought out.
>
> six more leads to the outside world.
>
> Total of nine leads to the outside world, before configuring as
> either a 240V or a 480V motor.
>
> 3) Now, if you want it to run at the lower voltage, you connect
> the three windings from (2) above into another Wye, insulate the
> center and connect the three remaining leads to the three from
> the winding in (1) above. Bring a wire out from the junction of
> the winding from (1) and the winding from (2) to connect to the
> power. (Of course, it makes a difference which windings and
> where they are connected, so each wire should have either a
> crimped on ring with the number, or the number printed along the
> wire every inch or two.) The windings from (2) are in parallel
> with those from (1), so they run at the same voltage, and each
> carries half the current.
>
> 4) If you want it to run at the higher voltage, however, you
> connect one end of each of the three coils in (2) above to one
> of the three wires from (1) above, so the coil from (2) is in
> series with the coil from (1). Proceed to do the same with each
> of the two remaining coils. Insulate each of these junctions.
> Bring the free ends of each of the windings from (2) out to
> connect to the power. In this case, the windings from (2) are
> in series with the windings from (1), so the voltage is double
> that with the (3) setup, and the current is half that with the
> (3) setup. Again, which winding is where is important, so
> again you refer to the numbers either crimped around or printed
> on the wires.
>
> In either case, there should be printed on the motor's nameplate
> which numbers of wires should be connected together and whether they
> should be connected to the outside or just insulated.

His name plate only said star/delta thus he had no standard 9 wires to work
with. He achieves hi V, loV by connecting the motor in star or delta
apparently.

Bob Swinney
>
> Enjoy,
> DoN.
> --
> Email: <dnichols@xxxxxxxxxxx> | Voice (all times): (703) 938-4564
> (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
> --- Black Holes are where God is dividing by zero ---


.

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