EVFR 2.0: AC20 mounted!

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A little to update since the last entry. I found a dual 0-30V 0-5a power supply from a local guy. I’ve been looking around for one for a month or so, just to see if one pops up. It was a good deal, so I snagged it. I’ve been charging 4 batteries at a time for the last week, and it REALLY helped. I have a little RC charger, this power supply and a little Vicor power supply setup. I can charge all at about 0.5C. I just set the voltage to 3.7V and come back in an hour and they’re usually done. They’ve self discharged a bit, but they’re all still good.

I also decided to mount up the AC20. I’ve been procrastinating, but I needed to make sure it fit. I spent some of the day taking the motor apart so I could get the mounting ring around the motor. I got the stator mounted in the chassis and got everything lined up. It’s much easier to lift into position without the rotor when you’re doing it alone. Once it was in the chassis, I slid the rotor in and reassembled the motor. It needs a little adjustment, but I’m at the end of the slots on the mounts. When my buddy made this for me, I don’t know if it was adjusted correctly, because it seems like the motor is a little low. I think with the weight of batteries and a rider, the crouch of the bike will be a little lower. I think it ought to line up. Some pics:



I threw the chain and a 13 tooth sprocket on there just for fitment. I want this to be ready for when we start building the battery box. The drawings are done and we’re waiting for my buddy to get some time so he can machine the plastic pieces for me. I still need to get bussbar made too, but that shouldn’t take long. It’s going to be a busy 2 weeks for us so we can get this thing ready for the final presentation during the first week of june.

For now, I’m not going to install the BMS. I know, I know, you’re thinking why? Well, I’m not going to be riding it around yet. This is just for show and tell and for initial testing. I’ll have individual wires coming out so I can charge if one is too low. Once they present, I’m taking the bike back apart so I can do some maintenance. After we get the traction side working, I need to rebuild the shocks, install my new handlebars, get the DC-DC and 12V system working and install the BMS. It’ll be somewhat of a portable test rig.