Re: (ET) E20AA Basket Case

["David Roden" <etpost drmm net>]

On 24 Mar 2026 at 16:46, james murray wrote:

> A quick question for the group...has any ever run the drive motor in our
> ets on 48v?   I am building a new mower deck and the deck will be at 48v
> and hope to not change out the tractor drive motor just yet. Any 
> thoughts? 

I'm not a motor expert, so I defer to those who are.  

IIRC, ~20 years ago Mark Hanson built his own PWM controller for his ET.  
Since the controller didn't do field weakening (again IIRC), he raised the 
voltage to 48v to regain lost ground speed.

If Mark is still on the list, maybe he'll have some recollections.

I intuitively suspect that boosting the voltage would be safer with a 
wound 
field motor than with the PM motors used in some later ETs.  I'm pretty 
sure 
that wound field motors usually withstand overheating better than PM 
motors.

David Roden, EVDL moderator & general lackey

To reach me, don't reply to this message; I won't get it.  Use my 
offlist address here : http://evdl.org/help/index.html#supt

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