Hi,
I bought a servo off ebay a while back 2.8kw at 3000 rpm. I cant find a drive to run it at least that I can afford.
This servo is quite old, mid 90's, but looks brand new. It is fitted with a resolver and restricts the choices for a drive.
I tried sensorless vector drive but am unimpressed.
I made the decision to build one, very much easier said than done. This hobby, or should I call it an obsession, requires
you learn all sorts of new stuff. If success is determined by what you learn along the way the this project is a boomer!
Looking around both new and secondhand there are plenty of servos to choose from and cheaply if secondhand. Drives
are a different kettle of fish altogether.
Amongst the bigger industrial drives it is quite common to separate the power supply from the inverter. It allows flexibility
to spec the supply to your existing regulations and whether you have your own onsite transformer.
There has been a big upsurge in VFD use in rural NZ for irrigation pumps. Now the power supply authorities are having
to demand farmers fit these units because of the degradation of the supply. They can be nearly as much as a VFD.
There is nothing to prevent you from running single phase but you will need a dedicated 32A or maybe even a 50A supply.
The power company will probably come down on you to fit a conditioning unit otherwise you will degrade your neighbours
supply. Additionally most servos above 2.2kw are rated for 400v line or 560v DC link. If you run such a servo from 230v line
it will not achieve rated speed. A PFC boost in a conditioning unit will overcome the problem but it will SUCK major current
and you going to have some BIG link capacitors.
Search for single to 3 phase converters but be warned they are expensive and you DON'T want junk because they blow
up. I've had several thru work, Chinese stuff and the proud owners are livid!
Craig