Re: Gecko Stepper on Bridgeport

Mariss Freimanis wrote:

>At 160VDC they will run 2 to 3
> times faster.
> The amperage will stay the same if I'm lucky. The "on" resistance
> of a MOSFET goes up as the square of its rated voltage.

> The present
> drives use 100V rated MOSFETS, the new one will need 200V rated
> MOSFETS. This means the size of the silicon die must be 4 times
> bigger to keep the same "on" resistance. The MOSFET package used in
> the present drive is called a "TO220AB". Beyond a certain die size

a

> bigger package must be used, and I mean much bigger (TO247).
>
> MOSFET cost hinges on die size and package. Since 8 are used per
> unit, this adds up rapidly.
>
> Mariss

Wally asks:

If i took one of your G210 drives and changed the fets to higher
voltage units could i run 160 volts or would other components need to
be changed. Buy the way do you give schematics out.