Smart and brown 1024 round head

[Marcus SharpParticipant @marcussharp16739]

Hi wondering if anyone can help, I have purchased a smart and brown 1024 round head lathe and I'm waiting to run it of an vfd inverter that I have 4hp . Thing is I cant work out how to change it to delta pattern.

Has anyone any ideas?

Thanks Marcus

[Marcus SharpParticipant @marcussharp16739]

Inverter

[JohnFParticipant @johnf59703]

Marcus, we have one of these machines running on an inverter, my son did the electrickery — not my forte' but I am sure an alternative motor was fitted because the original 2 speed motor is not suited to VFD drives ?

I'll check with him tomorrow and let you know.

John

[Marcus SharpParticipant @marcussharp16739]

Thanks John.

[Clive FosterParticipant @clivefoster55965]

If you want to use a VFD you will either have to change the motor or buy one of the modified ones with voltage doubler input stage to give 440 volt output.

The standard motor is a Dahlander pole changing type which doesn't have the usual star – delta connection choices needed to run on either 440 or 220 volts three phase. See the Wikipedia article here **LINK** for details of the two speed version. As you can see the equivalent to delta connection is the low speed arrangement and equivalent to star is the high speed.

The 1024 has a three speed version. It is possible to re-arrange the motor coil connections so that either high or medium speed can be driven via a 220 V output inverter. Medium probably being best. Doing so requires the motor to be opened up and some internal connections re-arranged. Not something folk unfamiliar with motors should undertake as it would be easy to wreck it. I have the circuits. PM me if you are interested.

Modifying the motor is, in my opinion, a daft way of going about things as a 6 pole motor with standard VFD will cover the speed range happily.

Clive

PS Removing the motor assembly isn't easy. Space is limited and the parts are heavy. Personally I'd put a rotary converter on it, Transwave et al, and call it good.

 

Edited By Clive Foster on 30/10/2019 00:26:24

[Clive FosterParticipant @clivefoster55965]

Ooops. After midnight posting error!

First sentance of the third paragraph should read :-

The 1024 has a three speed motor with an extra set of star connected windings to give low speed whilst the two speed Dahlander connected windings handle high and middle speeds.

Sorry.

Clive

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