Hey all,
Well I really want to get my Soleq EVCort on the road, I have been trying to design my own
controller but I don't want to have to wait another 6 months or so that it will probably require
for me to finish design, testing and tweaking and that's assuming all goes well.
So I want to try yet another approach with the help of the group. (This is something like Plan E.
I gone through in phases Contactor, Rectactor, Mechanical PWM, DIY Controller, etc. )
As some of you may know the EVCort has a GE SepEx motor, and the controller runs at 800Hz with 2
separate banks of 200 Amps each connected to their own inductor before the armature terminal on
the motor. It also has Regen of 200 Amps connected to 1 of those armature branches. The battery
pack is 108V and is intimately tied to the DC-DC and charger and inverter for the A/C.
What I would like to try is to use a low voltage (24-48) low amperage (<100) controller to control
the field. I guess I would need a DC-DC converter for this. And also something like the Curtis
1221 or 1231 to control the armature. I may have to go without Regen until I can either fix my old
controller or build my own.
Now I know that these newer controllers use the higher switching frequency (>15kHz). Would that
cause any problems on either the field or armature? Do I still need to connect it to one or both
(in parallel) of the inductors on the armature?
I know I need the field to be on before the armature so I was thinking of connecting the movement
backwords and having the travel of the accelerator pedal connected with springs and stops to go
from 0 to 100% on the armature controller and then go backwards from 100 - 20?% for field
weakening to get more RPM. Would there be a problem if the current on the field controller went to
Maximum instantly from a microswitch or something on the accelerator? (I think I will physically
limit it with the throw of the pot which I will have to determine the position and then lock it
there at about 20Amps) Normally the field is driven at full battery voltage (nominal 108V) and max
of 20 Amps. Would the current change if I drive it at a lower voltage? Or are 20 Amps 20 Amps?
Also, I suppose the requirements for contactors and precharge, etc. will be the same as any other
series wound arrangement.
I'm sure I am forgetting something so anything else you can think of will be of help.
Thanks all,
Chet Fields
P.S. If someone can come up with the ability to keep the Regen with this setup that would be a
great bonus.
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
Well I really want to get my Soleq EVCort on the road, I have been trying to design my own
controller but I don't want to have to wait another 6 months or so that it will probably require
for me to finish design, testing and tweaking and that's assuming all goes well.
So I want to try yet another approach with the help of the group. (This is something like Plan E.
As some of you may know the EVCort has a GE SepEx motor, and the controller runs at 800Hz with 2
separate banks of 200 Amps each connected to their own inductor before the armature terminal on
the motor. It also has Regen of 200 Amps connected to 1 of those armature branches. The battery
pack is 108V and is intimately tied to the DC-DC and charger and inverter for the A/C.
What I would like to try is to use a low voltage (24-48) low amperage (<100) controller to control
the field. I guess I would need a DC-DC converter for this. And also something like the Curtis
1221 or 1231 to control the armature. I may have to go without Regen until I can either fix my old
controller or build my own.
Now I know that these newer controllers use the higher switching frequency (>15kHz). Would that
cause any problems on either the field or armature? Do I still need to connect it to one or both
(in parallel) of the inductors on the armature?
I know I need the field to be on before the armature so I was thinking of connecting the movement
backwords and having the travel of the accelerator pedal connected with springs and stops to go
from 0 to 100% on the armature controller and then go backwards from 100 - 20?% for field
weakening to get more RPM. Would there be a problem if the current on the field controller went to
Maximum instantly from a microswitch or something on the accelerator? (I think I will physically
limit it with the throw of the pot which I will have to determine the position and then lock it
there at about 20Amps) Normally the field is driven at full battery voltage (nominal 108V) and max
of 20 Amps. Would the current change if I drive it at a lower voltage? Or are 20 Amps 20 Amps?
Also, I suppose the requirements for contactors and precharge, etc. will be the same as any other
series wound arrangement.
I'm sure I am forgetting something so anything else you can think of will be of help.
Thanks all,
Chet Fields
P.S. If someone can come up with the ability to keep the Regen with this setup that would be a
great bonus.
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev