Re: VFD motors speeds

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Yesamazza@a... wrote:

> When using VFD's that put out high HZ how do you choose a motor

since they

> are based on 60hz what is the max RPM of a standard motor if not

rated? I

> know some motors are rated for 400hz that are made for routing ect

but what

> about regular motors are you able to use a regular motor at more

than 60hz

>
>
> [Non-text portions of this message have been removed]

I was told by an engineer at Baldor that all their new motors can be
safely run at up to 5000rpm. That'd be about 166hz on an 1800rpm
motor. For about 6 years now I've been running an older heavy frame
motor up to that speed with no problems.

When you think about it 5000rpm is not much for a purely rotating
device when you consider our car engines with their reciprocating
components rev up like that all the time.