Hello,

I did not hear it before. My experience shows the slip is relatively
constant so if it increases then the motor would stop immediately. My
feeling is you want a so called closed-loop regulation instead of V/Hz. Of
course, it is doable, normally with a tacho-gen.
BTW if you tell me the conditions (size, power, etc.) I could try to find
an appropriate solution (Mitsubishi drives are REALLY small in lower power
class).

Regards,
Imre

On Wed, 22 May 2002, Morgan Olsson wrote:

> Thanks Chris for the link
> Thank you Imre, also my first feeling was it is too complicated.
>
> The customer had problems finding a standard VFD to fit in the encapsulation, and size reduction can be sifnificatn as we can design for the encapsulation and also use it efficiently for cooling, use the same microcontroller, etc.
>
> I believe one solution idea might be V/Hz control, and good feedback from motor shaft encoder, and boost I and U when slipping.
>
> Thinking...  I/slip regulation?
>
> /Morgan
>
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