My new mill has a 90V servo motor for the spindle. My current PS is linear 72V with dual rectifiers. The PS will be overloaded with the new spindle motor and the 4th axis motor, so I am contemplating buying a second PS and I am in something of a quandary of what to buy. The 90V motor runs OK on 72V, but does not achieve the speed I need.
I have axis motors running fine at higher (in one case double) than their rated voltages and I was looking for opinions on where to run a 90V spindle motor and what ramifications if any I would encounter running the motor at 130V
Also I see that dual rectifier PS can have the secondaries wired in series or in parallel for double volts of double amps. I am wondering in this case if it is possible to run one motor by taking the power in series and still be able take the regular voltage off the respective rectifiers. For example, can a dual rectifier 80V SP supply 160V for one motor and 80V for other motors by taking power from a series wiring for the HV and straight into each rectifier for the 80V?
Doesn't sound wise to me. For one thing, motors have voltage and current ratings for a reason - if exceeded, the motor can fail, sometimes spectacularly. Increased voltage also implies increased current, which, in a servo motor, can cause demagnetization. It also means increased heat, and servo motors are usually not intended for continuous heavy use, so not vented. As for "ganging" transformers, that can be risky, as someone pointed out. You're much better off buying or building a single power supply suitably sized to your application. Lotsa good transformers and power supplies available at very reasonable prices from antekinc.com.
Regards,
Ray L.