Re: (ET) field weakening on E15 and moving dirt

["David Roden (Akron OH USA)" <roden ald net>]

In past email exchanges with Mark Hanson, I had the impression that he 
went 
to 48 volts in part to compensate for the loss of top speed because of 
losing the field weakening.  I could be wrong about that; ask him.

You might look into a pwm controller built for a shunt golf car motor.  
Yamaha makes one, or at least used to.  One warning, though: I've read 
that 
a close match between the motor characteristics and controller 
characteristics is appreciably more critical for a shunt / compound 
controller and motor pair, than for a series motor setup.  I don't know 
what 
the consequences of a poor match might be; does anyone else?

One final note -- you may find that Mark Hanson is willing to offer 
suggestions if you want to modify your ET.  I'd contact him and discuss it 
before going any further.  He seems to really know his stuff.


David Roden - Akron, Ohio, USA
1991 Solectria Force 144vac
1991 Ford Escort Green/EV 128vdc
1970 GE Elec-trak E15 36vdc
1974 Avco New Idea 36vdc
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