(ET) E-12 motor type

[Bill Alburty <willaim kc rr com>]

Thanks to all for the help in identifying the type of drive motor I have 
in my E-12. I know now that it is a series wound type, so I now want to 
find a PWM controller that will work with it.  I have no idea what the 
Alltrax, 4QD, or Curtis controllers cost or where to get them. I'd also 
like to know how the operator controls the speed with them.  Is it with  
a knob on a potentiometer, a foot accelerator, or by modifying the 
existing lever?
Since I understand PWM generators don't work with series wound motors, I 
made some measurements on the series wound motor in my Cushman electric 
golf car, which is about the same size as in my E-12. While driving 
around the yard, the field winding measured about 2 VDC and the armature 
had 30 some VDC. As David Roden suggested, why couldn't  I provide 2 VDC 
independently to the field winding, while using PWM to the armature? 
Would additional inductance or anything else be needed? Has anyone tried 
this?
Thanks for any info.
Bill Alburty
E-12 in Kansas