Re: [CAD_CAM_EDM_DRO] PSU for my first project

Why are you using Toroidal Transformers?

If you obtain a one of the yellow site 110 volt transformers, about £10 in a second-hand shop, this will do the job and supply more than enough current at about 65 volts. The transformers inside the oil filled box are usually 55-0-55 centre tapped so it is just a matter of removing the transformer, rewiring and putting it all back. You could even use the sockets on the outside for connection to the drivers.

Regards,

Terry

Ps This only applies here in the UK where we insist on using 110 volt tools on sites and the countries electric supply is 240 volts.


Hi all,

Although a newbie to the world of CNC and electronics I am going to
attempt to CNC an old lathe I have.

I have been viewing the excellent advice given on the group and have
tried to collate the info I need to build a power supply. I would be
grateful is somebody would look at my proposed shopping list and
tell me if I am on the right track.

UK voltage.

I plan to use 4 x Gecko G210 drives to power 4 x Sanyo "H" Series
Stepper motors. I have not decided on the spec of all four yet, but
will try a Size 34 double stack 4A/phase 4 lead 4.91Nm to start (for
the lathe carriage) and then increase/decrease spec to suit.

I have been told that I will need a power supply producing around 60
to 65Vdc and that 1 Amp for each motor should be allowed. I have
also been told that I need a linear power supply e.g. transformer,
bridge rectifier, smoothing capacitors (with discharge resistor).

With this in mind I plan to buy the following.

Toroidal Transformer
2 x 60V Sec (or should I buy 2 x 30 Secs?) I do understand what is
meant by the rating VA. They seem to range from about 50VA up to
1000VA, is there a formula for calculating my requirements. I am
guessing I need about an 8A supply?

Bridge Rectifier

400V PIV 35A 280V RMS ?

Capacitor(s)

100V 15000uF from Bridge rectifier
100V 470uF across power terminals on each driver

Volt meter display

I guess these are pretty standard specs ?

Heat sinks

Will I need heat sinks for the Gecko's ?

Discharge resistor

Not sure about this one !

Any links to schematics would be appreciated, although the one
posted recently on the Gecko site looks pretty straight forward.

Thanks in advance, and apologies for the basic questions. I did a
search on Toroidal but did not come up with much.

Regards,

Ian


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