Guru
Joined: 22/02/2006
Location: AustraliaPosts: 2082
| Posted: 08:31am 06 Dec 2025 |
Well guy's this was one forum where I didn't document this build and every other forum where I did is now gone so no pictures from the build.
I have been talking with the Electrical Engineer at work about my inverter build and the high currents involved etc so I thought to ask the question about slip rings and the high currents that will be there with this motor conversion.
I machined up a new rotor and put 22 N50 16x13mm round magnets on each pole for 88 neo's in total and only broke one magnet along with a sore finger for a week after a brain fart. Then potted with epoxy and machined for a 2mm clearance from the lamination's on diameter.
I did a one wire test and found off memory 30 turns where I went 3 inhand 1.2mm wire was used along with sore fingers after.
Doing a lathe test was fun at 240 rpm cutin saw a flash of 90amps then my VFD complained of over current. So with a 2hp 3 pahse motor and a programmed VFD this conversion acted like a break.
I had a 100amp 3 phase bridge rectifier going into 2 truck batteries in series for 24 volts and on the third test where the same 90 amps was shown on the clamp meter the bridge rectifier let out the magic smoke.
So for years the conversion has sat there and the talk about 460 amp brushs for the slip ring has me thinking time to design and make the slip rings up and finally get this project going again.
Now for the blades I'm going to carve up some red gum to use as I do have a few big dead gumtrees for the donor wood.
There is a story to tell and a long road before this motor conversion is in the air procuding power.
Regards Bryan