mid-range instability was Re: Allegro 2961 uptdate

--- In CAD_CAM_EDM_DRO@y..., ballendo@y... wrote:

> Hello,
>
> First, I'll assume you are not trying to make decisions based on
> unloaded motors...
>
> Lanchester dampeners are the "classic" solution. These consist of a
> viscous fluid contained in a housing around a metal disk which is
> driven by the motor (often the 2nd shaft is used). The additional
> damping provided by this "raw egg" spinning reduces/eliminates the
> resonance.
>
> Good machine design will also help. Very often motors are sized
> incorrectly for the load and speed needs of the system. I'm guilty

of

> trying "what I have" instead of always calc'inc the correct motor

for

> the intended use. ALL the major motor mfrs. have motor "sizing"
> software freely available. If you are not using their motors you

will

> need to cross reference to what you intend to use...
>
> Thirdly, and related to the above; the simple addition of friction

to

> the machine drive assembly may help.
>
> The BEST way to deal with mid-range resonance is to use good

machine

> design, AND use a drive (like the Geckos' ) which have been

designed

> with the reduction of this problem in mind...
>
> Hope this helps.
>
> Ballendo
>

Thanks Ballendo.
Can you give me some web sites where I can take a look at Lanchester
dampeners? I did some searches but did not find any.
Lonnie