AC servo motor help !

[GEOFFREY]

Why is the money wasted? Surely you can still use a 220v single to three phase inverter to power the drive. G.

[rnr107]

Why is the money wasted? Surely you can still use a 220v single to three phase inverter to power the drive. G.

Well, according to m_c (see above) who seems to know what he is talking about, you can't... It has to be proper 3 phase...

[GEOFFREY]

I know that m_c knows exactly what he is talking about, but I think he was referring to using only the L1&L2 connections on the drive. With the inverter I think you can run it as 3 phase using L1,L2&L3. G.

[m_c]

godonlyknows

[rnr107]

You can't run a servo drive from an inverter, as the servo drive load is not constant, which at best would lead to something faulting out/just not working, and at worse blowing something up.
What you could do if you really wanted to use this servo, is build a rotary converter to produce the required 230V 3 phase, and get the phases as balanced as possible. All that's needed is a suitable 3 phase motor, some capacitors, and a couple switches (plus a relay and contactor if you want automatic starting).

Hi m_c,
Your first reply gave me an idea last night...
I opened up the enclosure of the drive and as you said, the AC from the 3 phases goes to 2 bridge rectifiers and a series of big caps.
So, using L and N single phase would use only 1 rectifier (and therefore geting it over worked...

Now, there is nothing in there requiering a phase shift between the 3 phases coming in....all the bridge rectifiers care about is 240V AC...
So, I decided to connect Neutral, Live, Live where the 3 phase were supose to go (L1, L2, L3)... This way the load is spread over the 2 briges as per 3 phase setup.

Tryed that this morning... All good! Motor happy, drive happy... (all stays cool )


These servo motor are really quiete! even at 3000 RPM ! amazing!


Laurent

[Jonathan]

For peace of mind you could increase the size of the capacitors to compensate for single instead of 3 phase.

[rnr107]

For peace of mind you could increase the size of the capacitors to compensate for single instead of 3 phase.

Funny that you mention this... :-) On the PCB there is a foot print for 5 caps but only 4 fitted! Could add an exta one I suppose...

[Gary]

What is the power of the servo motor/driver?
And who is the manufacture /model number?
If you got it from a company, you can return it if it is not fit for purpose.