Re: (ET) E-12 Traction motor PM?

["David Roden" <etpost drmm net>]

The Alltrax specialized PWM controller is programmed for the E15; that's 
the 
machine on which the designer installed his.  I expect it willl work OK 
with 
an E12 motor, but I'm not 100% sure.  IIRC the few people who've had 
problems with Alltrax controllers have been fitting them to E20s, but 
don't 
quote me on that.  I use an Alltrax on my E15, and I'm really pleased with 
it.

At least one person - I think on this list - has used a 4QD controller (PM 
motor type) successfully on an ET with a wound field motor.  IIRC, he used 
the 4QD's electric brake control to operate a field relay.  These 
controllers have are English-made, and have an outstanding reputation.  I 
have an older 4QD sitting on the shelf here, intended for my New Idea ER36 
(which DOES have a PM motor), but never seem to get the time to install 
it. 
:-(

I think some folks have also used Curtis controllers in ETs.  These are 
series motor controllers, though, and you might need some extra series 
inductance to ensure that the current limit works right and that operation 
is smooth.  As with a PM motor controller like the 4QD, you'd have to find 
a 
way to ensure that you never applied power to the armature until the field 
was powered up.

I've also wondered now and then whether some of the larger scooter 
controllers might suit an ET.

So, there are actually several options for usable PWM controllers, though 
most of them require a little bit of tinkering, and some familiarity with 
basic electrical circuits.


David Roden - Akron, Ohio, USA

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