zombiess
10 MW
I finally got off my lazy butt and got my 18.6kV high speed wind Cromotor running. It's awesome. I have it laced into a 14" motorcycle wheel with a tire that comes out to 18" in diameter and 2.5" wide. I ran the bike on a half discharged battery pack setup of 18S lipo. Peak voltage when I started off was 69V. I don't have the shunt exactly calibrated, but it's an EB318 FET controller board that I bought off BlackArrow for $10 (board only, no case/wires/fets. Board was originally meant for spare parts since phase A was blown to hell). For some stupid reason I spent 7 hours completely rebuilding this. Had to replace the SOT-23 NPN transistor on driver A since it was toast along with it's traces. Repair took so long because working with SMD is a MF'r for me and honestly I'm amazed I made it work at all. I then installed 18 brand new matched IRFB4110's I had left over from the 24 FET controller builds I did (still have 2 left if anyone is interested).
For this maiden journey I said screw it, lets test out this controller at 70A battery, 130A phase and see what it can do. I opened up the MK2 software and saw the battery amps only go to 65A max... F' that, open up HXD and start hex editing. Now my MK2 software goes from 7A to 250A battery side. I have to give XPD a shot now to see if the values all match up now that I have a base line.
So I programmed the controller and set the 3 spd switch to 33%, 66% and 99% throttle. I leave the maximum at 99% because I ALWAYS want to be in PWM because I measured this motor at 30uH inductance, 37mOhm per winding, which puts this motor into controller killer territory. None the less, I had faith that matched FETs and 99% throttle would allow it to live so off I went. Top speed with the battery sagging to 63V was 50mph. Came back home after 1 mile, reflashed the controller to 115A battery, 140A phase and took it out again. I only saw a max of 103A battery but it had more pep, battery voltage was sagging to 61V under load and resting voltage was 67V when I started. Batteries are pretty much done and were starting to get warm. During Regen I noticed I was able to hit peaks of 44A and that slowed me down good, sometimes giving a little chirp at engagement, but it was not violent.
So to sum it up I did 3.5 miles of hard riding at 70-105A, the controller was barely warm (the batteries got warmer than it did) and the motor laughed at me and said "is that all you got"? It was the coolest running piece of the entire setup.
Over all a really good night, I love this motor, but I need to feed it more amps and batteries. The mid range to top end pull is nice. Starting off is much easier than the 9.3kV motor, at least until I crank up the phase amps or add more voltage.
One major difference I noticed between this motor and my 9.3 V0 Cromotor is this (V1 Cromotor) is really quiet. Could be due to the MC wheel not resonating the same as a bike setup does, even my wife noticed it's really quiet compared to my other motor.
BTW, this setup was no rear disc, only regen. The bike felt the most stable it ever has, probably because the smaller wheel changed the geometry. Going 50 felt very smooth. Kinda strange having to counter steer like a sport bike does on a bicycle. Had a lot of onlookers doing double takes.
Here are some pics of the setup.
View attachment 2
View attachment 1
For this maiden journey I said screw it, lets test out this controller at 70A battery, 130A phase and see what it can do. I opened up the MK2 software and saw the battery amps only go to 65A max... F' that, open up HXD and start hex editing. Now my MK2 software goes from 7A to 250A battery side. I have to give XPD a shot now to see if the values all match up now that I have a base line.
So I programmed the controller and set the 3 spd switch to 33%, 66% and 99% throttle. I leave the maximum at 99% because I ALWAYS want to be in PWM because I measured this motor at 30uH inductance, 37mOhm per winding, which puts this motor into controller killer territory. None the less, I had faith that matched FETs and 99% throttle would allow it to live so off I went. Top speed with the battery sagging to 63V was 50mph. Came back home after 1 mile, reflashed the controller to 115A battery, 140A phase and took it out again. I only saw a max of 103A battery but it had more pep, battery voltage was sagging to 61V under load and resting voltage was 67V when I started. Batteries are pretty much done and were starting to get warm. During Regen I noticed I was able to hit peaks of 44A and that slowed me down good, sometimes giving a little chirp at engagement, but it was not violent.
So to sum it up I did 3.5 miles of hard riding at 70-105A, the controller was barely warm (the batteries got warmer than it did) and the motor laughed at me and said "is that all you got"? It was the coolest running piece of the entire setup.
Over all a really good night, I love this motor, but I need to feed it more amps and batteries. The mid range to top end pull is nice. Starting off is much easier than the 9.3kV motor, at least until I crank up the phase amps or add more voltage.
One major difference I noticed between this motor and my 9.3 V0 Cromotor is this (V1 Cromotor) is really quiet. Could be due to the MC wheel not resonating the same as a bike setup does, even my wife noticed it's really quiet compared to my other motor.
BTW, this setup was no rear disc, only regen. The bike felt the most stable it ever has, probably because the smaller wheel changed the geometry. Going 50 felt very smooth. Kinda strange having to counter steer like a sport bike does on a bicycle. Had a lot of onlookers doing double takes.
Here are some pics of the setup.
View attachment 2
View attachment 1
