Re: (ET) E-12 motor type

[Robert Adsett <subscriptions aeolusdevelopment com>]

On 4/18/2010 3:28 PM, Bill Alburty wrote:
> 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?

I've built controllers to do just that but I doubt you will find much 
support for doing it on a one off basis.

Remember that the field in a series wound motor takes full current.  So 
you are talking about a full power controller just on the field.  Also 
at 2V you are getting close to the usual controllability limit for motor 
controllers and you likely won't have very fine control over the current 
if you take that route.

If you set the current in the field to that used during normal running 
you will reduce the motor torque.  If you set it to the current during 
high load/accel then you will likely overheat the motor and you will 
reduce the top speed.

That said it is certainly possible, just not simple.

Robert


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