RE: (ET) E20 main motor rating / max amperage

[Rob Brockway <getractor yahoo com>]

These numbers are great.  I think this is an excelent reference.  I often feel the motor run with field weakening draws more power than going to the next gear.

Rob, NH

Markus Lorch <mlorch vt edu> wrote:

> > > I'm surpised at your current readings. My ammeter (150A max
> > > hall effect 
> > > probe) usually runs around 30-40 A in flat mowing (traction 
> > > motor and 
> > > mower motors combined). I've never seen it run over 60 A or 
> > so total. 
> > 
>
> Here the measurements I took this evening with my inductive Ammeter
> attached to the wire going to the battery. The readings are fairly
> rough numbers:
>
> Driving on level asphalt road:
> L, Speed 4 25 A
> L, Speed 8 35 A
> D1, Speed 4 35 A
> D1, Speed 8 90 A
> D2, Speed 4 50 A
> D2, Speed 8 100 A
>
> Mower motors with deck off ground, traction motor not engaged: 25A
>
> Mowing on level ground :
> L, Speed 4 50 A (up to 75 A if there is an incline)
> L, Speed 8 80 A (up to 100 A on an incline)
> D1, Speed 4 75 A 
> D1, Speed 8 120 A
>
> This shows that mowing
>  in L consumes a bit more power in Speed 8 than in D1,
> Speed 4
> BUT if one has to go slower then using the L speeds is much better.
>
> Start on almost level asphalt road with max. accelleration:
> L = briefly exceeding 400A, then quickly going down to 35A as the tractor
> gets up to speed 
> D1 = briefly exceeding 400A, then quickly going down to 90A as the tractor
> gets up to speed
> D2 = briefly exceeding 400A, then after a moment I can here the current
> limitting turning of the field weakening, holding amperage for a second at
> 300A, then decreasing to 100 A
> as the tractor gets up to speed 
>
>
> I hope you find these numbers interesting
>
> Markus
>
>
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