Warp9 Sep Excited or Series ??

[rsisson]

It looks like I finally will have a donor Vehicle for an EV conversion... A 1999 Toyota Corolla in great shape.

Once I find an Adapter plate for a Warp9 motor most of the really hard stuff is done...

QUESTION: The Warp-9 although normally wired as a series motor provides access to the Field and Armature separately. What would be the advantages for separately exciting the motor? Would it be more efficient? Better torque at a given load/speed?

Series control is easy, everyone has simple controllers... Kelly has a series of controllers for Sep. Excited configurations, or can combine controllers to do this as well...

https://www.kellycontroller.com/shop/?mod=product&cat_id=30&product_id=394
http://home.earthlink.net/~evtkw/controller/maincontrollerpage.html
https://www.kellycontroller.com/shop/?mod=product&cat_id=36&product_id=451
http://www.kellycontroller.com/mot/Products.html

I already have a smaller Kelly controller on my Quad...I love it..the "throttle Regen" works like engine breaking and the Setup from a PC is GREAT...

My question is... is Separately Exciting worth it?

 

[Drunkskunk]

I've always been a fan of both reaching similiar levels of excitement simultaniously, but others may be into that sort of thing.

Wait... what was the subject again?

 

[lawsonuw]

Series wound: simple, likely has a higher starting torque, power drops way off past the peak power rpm (can be mitigated by switching in a resistor parallel with the field).

Separately Excited: will have a little more peak power (no field coil voltage drop), Will have full power up to the red-line of the motor, more complex controller, field coil will likely need to be re-wound to work at a lower current and higher voltage to keep the controller happy.

The above is my opinion based on the motor equations for each type of motor. If the car's transmission is retained, then the greater power at high rpm of the sepex motor is moot.

My 2 cents,
Lawson

 

[tostino]

Sep-ex also provides regen, unlike series. So keep that in mind.

 

[rsisson]

I am leaning towards the Sep-Ex option for the Regen.

Kelly controllers has a twin-controller configuration that supports regen...one controller for the Field and one for the Stator...

Thinking I could START with ONE controller (the larger more complex of the two) to get things running (ie built at all) and then upgrade to the linked controller configuration.

There are so many other things in the way, I don't want to get bogged down by details that don't really matter NOW that can be changed/upgraded later...

I DO however want to understand the ramifications of choices so I can decide if I want to build in the upgrade paths...

Sep-Ex looks like it adds basically another controller, a few feet of welding cables and a bit of tweeking... all of the rest would exist for the basic controller anyway (contactor, and other stuff) I won't need reverse, as that will come from the Manual Transmission... it actually looks pretty simple, just $$.

I really like Kelly regen, they have a programmable option called "Throttle Regen" in that if they see a throttle back, they wait and then assume you want to apply ENGINE BRAKING...and you can program how much current/voltage can be sent back to your pack...works wells..I have it on my quad now...