Re: [CAD_CAM_EDM_DRO] linear servos

carlcnc@... wrote:

> I am looking at some big linear servos,price is right but can't
> find documentation of how much force or "thrust" they are capable of.
> Only specs are 20Hs,20Hn[assuming s,n mean south/north poles of
> magnetic field]
> Does anyone know the value of H ? and yes in spec sheet it is always
> upper case.
> Obviously I am interested in ftlb or Nm for calculating accel of
> loads.

EEs use H to mean magnetic flux. The problems with most of these
linear motors is that they require HUGE currents at very low
voltage, which is a problem for power transistors. They also tend to run
hot, and may need water cooling for machine tool use.

Also, there are several different designs. Since you say servo, I'm
guessing these are made for positioning use. Some of the devices
are AC only, and can't be used for positioning without a lot of trouble.

Jon