RE: (ET) Electric Chipper/Shredder?

["Markus Lorch" <mlorch vt edu>]

Chris,

that's right. One would have to maintain the motor field until the
motor stopped. If I remember right then somebody posted a while ago
that the large New Idea version used an electrical brake once one 
stepped off the accelerator. Does anybody know how this worked?
I think I would like this on the E20s as well. 

Markus


> -----Original Message-----
> From: Christopher Zach [mailto:czach computer org] 
> Sent: Mittwoch, 15. September 2004 09:29
> To: Markus Lorch
> Cc: 'Klein Robert W NPRI'; elec-trak cosmos phy tufts edu
> Subject: Re: (ET) Electric Chipper/Shredder?
> 
> 
> > the chipper. Further more if you have a heavy duty resistor
> > laying around the contactor could break the motor by directing
> > induced armature current through the resistor. (you could also
> > short the armature but I think that would chew up the contactor
> > rather quickly). 
> 
> Won't work. When you cut and short the armature, you'll also 
> be cutting 
> power to the field. Without field current, the motor is nothing more 
> than a spinning metal thing.
> 
> The only reason this works for the mower motors is because 
> their field 
> is constant (ie: magnet motors)
> 
> Annoys me to no end with the snowblower.
> 
> Chris
>