[spaceballs3000]

New member here, I've been reading all the great threads here!

Edit: opps meant to put this post in the 'Electric Motors' not the EV Performance folder.

I have a few question, does anyone have experience using AC55-A motor & UMOC 440tf controller?

Reason is I picked up a few pairs, I assume the controller likely came out of these buses http://metadope.com/Bus/Sale/index.html
But the motors that I have were not originally matched for these controllers.

Motor datasheet http://metadope.com/Bus/pdf/AC55.pdf
Controller datasheet http://metadope.com/Bus/pdf/umoc445tf.pdf

The motor controller has labeled "AC55-Delta", does the delta mean mean vs WYE motor configuration? Also any ideas how do I verify the AC55-A motor wiring configuration?

The AC55-A motor has a 256 count encoder, the motor controller was expecting 60 count encoder. so I've made a converter to that did that, so far I've gotten the motor to spin with the controller smoothly (no load.)

Which brings me to my main question, how would 2 of these motors + controllers do performance wise in a 2700 lb car? (or even 4.)

Current configuration idea would be 1 motor to an diff then the wheels, one front, one back. btw I have plenty of power, I have >3000Amps at ~380v (no sag), reading the motor controller datasheet seems to suggest to me that it's the weakest link, as the motor itself could handle more.

[madderscience]

looks like both you and I are trying to get more details on AC55/UMOC systems we have.

I've managed to get mine to run on the bench:

http://www.youtube.com/watch?v=VuIZmYhrMUM)

There is a fellow who lives near me who has experience with the somewhat newer but nearly identical, Azure AC55/DMOC system in a passat station wagon. (He had the system in a vanagon for several years and has been driving it successfully, but he recently moved it over to the passat as it is a better commuter for him). He was kind enough to take me for a test drive in it, although he was still working the bugs out of the swap so we weren't able to run around too much. My main observation was it seemed the car wasn't as powerful as it probably should be. Specifically if these motors are designed for direct drive, why would it stall on a roughly 10% grade (unable to start from a dead stop)? This was in 3rd gear, about a 5.7:1 overall gear ratio with 23" diameter tires which is right in the range azure/solectria suggests for these motors, and the car plus passengers probably weighed about 3700lbs which is also well within the recommended range. If you do the math the motor should only have needed about half its 230nm peak torque rating to get going on that hill under those circumstances.

Also, I just recently discovered the delta vs. wye differentiation you are asking about, and was trying to determine what setup my motor is as well (also an AC55-A). My UMOC440TF doesn't have anything on the label to suggest which way it is programmed for.

The UMOC service manual PDF I have (found on the metadope site; I downloaded everything they had) only has a brief mention of delta-wye switching capability in some vehicles these inverters were used with, but there is nothing about programming the inverter for it. That does however suggest that this is a possibility. I also just found this:

http://www.mmsonline.com/articles/wy...in-perspective

which seems like a decent layman's explanation of the benefits and tradeoffs of delta vs. wye. It is aimed at machinists but they are still talking about inverters and 3 phase motors. the basic takeaway seems to be you want wye for low speed, high torque operation and delta for a wider peak torque RPM range. The Azure documentation I found (newer than the solectria stuff) lists two AC55 part numbers, a delta and a wye one, and I am wondering which one the fellow with the passat has.

I'll share anything I learn if you do

[madderscience]

and btw, where are you finding 3000 amps at 380v?

[spaceballs3000]

Nice video, actually I've watched it a few times about a month ago.

Feel free to PM me your email, as were both in the Seattle area, and we should be able to exchange a few things of what we learned.

"where are you finding 3000 amps at 380v?" I call it the mystery box for now

[mizlplix]

Ah....A "Tesla" mystery box....

Miz