The Bucking Magnet Motor

z.monkey · March 01, 2011, 06:37:15 AM

I changed the drilling and tapping strategy a bit...

I was using a 110 mil pilot hole. Really too tight for hard material. So I backed off to a 123.5 mil pilot hole, and the tap is a lot happier. Also limiting the depth of the pilot hole to 550 mils, and the tap to 500 mils. The screw only goes into the hole about 250 mils. So this is less stress on all the tools and me altogether. In the Stator Disk, I was making full depth taps, to the limit of the tap. Plus there were the weight relief cutouts that caused some problems. I probably should have waited to drill those until after the magnet screw holes were cut...

z.monkey · March 01, 2011, 08:48:29 PM

Before I finish the Driver Ring, I needed to fix up the Driver Ring support pins. Having a threaded bolt there is going to make for a difficult insertion of the Driver Ring. So I needed some smooth rods to slide the Driver Ring on to the rest of the assembly. These Pins are 1/4-20 x 3" bolts that have a 2" shank. I sawed the bolt head off and rounded off the stub so they are pins. Then the pins need to aligned so they are parallel, and square so the Driver Ring will move freely. I fabricated some 800 mil spacers out of 1/4" inside diameter aluminum tubes, that I just happened to have as scraps...

Edit: The spacers set the height of teh Driver Ring...

z.monkey · March 03, 2011, 11:01:19 PM

I got all the holes and taps finished with no problems on the Driver Ring. No tool breakage...

Assembled the driver ring, and gave it an initial test. No Self-motoring so far...

broli · March 04, 2011, 12:53:32 AM

Quote from: z.monkey on March 03, 2011, 11:01:19 PM
I got all the holes and taps finished with no problems on the Driver Ring. No tool breakage...

Assembled the driver ring, and gave it an initial test. No Self-motoring so far...

Good job anyway! It's rare to see people create things from scratch but creating things is imo a fundamental human trait. There's very little that can compare to the pride of being able to say "I created that". Whether it would spin or not that machine is already full of your energy.

z.monkey · March 04, 2011, 07:16:49 AM

Quote from: broli on March 04, 2011, 12:53:32 AM
Good job anyway!

While I appreciate your eloquent way of saying "It sure is pretty, but it don't work."...

Frankly were not done here yet. A couple of weeks ago I decided to take the relief cuts down to the limits. This created a lot of extra clearance between the magnets. I just now finished machining it. Haven't got a chance to study, refine, and balance it yet. That is where the magic is. There are 44 magnets in the UABMM and they form a balance. When you have a stall condition all these forces are equaled and at rest. Now, by adjusting the clearances I can slightly tilt that balance, hopefully enough to cause one transition, and then a cascade, and I am hoping that will make it go...

It does kinda want to go. Give it a push and it does run a few revs...

We just need to add some finesse, and PFM...

Sure is damn tired tho...