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RS do the UF400x series.

The main reason I placed diodes at both ends was because I had 7 feet of
cable going from the driver to the motor. Even with diodes at the motor
I was still getting inductive spikes at the driver end. I ran V+, GND
and two winding pairs to the motor using a 6 core mains supply cable.
The supply and drive to the motors was 38V @ 2A continuous. Another
addition to the drive circuit was a Zobel Network across each motor
winding. This cuts down high frequency spikes and RF noise.

This has worked very well for the last 6 years on a refurbished CT Head
Scanner assembly.

Roman Black wrote:
>
> Antonio L Benci wrote:
> >
> > Please don't use 1N914's or 1N4148. These are signal diodes not power
> > diodes. They may not be capable of handling the current spikes. The
> > UF400x series are UltraFast versions of the standard 1N400x series,
> > there is a difference. When using long leads I have always tended to
> > place diodes are BOTH ends. Lets be safe rather than sorry.
>
> Hi Antonio, i've never used UF400x diodes
> but I like the idea! If you don't mind me
> asking where did you get them from?
>
> I'm also confused with the "diodes at both"
> ends thing! How? Where's the current return
> path to the supply, or do you run the +v
> supply out to the motors also?
> -Roman
>

Nino.
--
------------------------------------------------------
| Antonio (Nino) L. Benci                            |
| Professional Officer, Electronic Services          |
| School of Physics & Materials Engineering          |
| Monash University                                  |
| email: nino.benci@spme.monash.edu                  |
| T: 61 3 9905 3649. F: 61 3 9905 3637               |
| M: 0414 924 833                                    |
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