The Bucking Magnet Motor

[z.monkey]

We I wasn't able to find a suitable piece of Aluminum laying around, but I did find a piece of Polyethylene.  The Polyethylene is structurally more stable than plywood, but also considerably softer than Aluminum.  I figured the Polyethylene would be suitable for a test rotor, to see if this unfurled idea works, then I replicate it in Aluminum.

I'll mark up the part using drafting tools by finding the center first, then draw a couple circles for the outer limit of the rotor, and the inner limit of the slots.  There will be 36 magnets on this rotor, so we'll use the compass to make ten degree increments around the periphery.  Then last thing to do before it goes on the Mini Mill is to make a half inch tooling hole directly in the center of the plate.

To hold the plate to the table I am using a T Nut, and a screw that has been modified to be jammed into the table to make the pivot point.  Then to hold it down I'll use a half inch Machine Washer, a Flange Nut, and a Lock Nut.  Line up the Pivot Point, the Mill, and the Drill Press Support Shaft to keep everything square.

The we'll do vertical cuts every couple of degrees around the periphery to cut the outer limit of the rotor, which is six and three eights inches in diameter.  Next we'll add some table clamps and cut the slots to hold the magnets.  The magnets are a quarter inch wide, so I am going to press fit the magnets in quarter inch slots.

http://scientilosopher.blogspot.com/2012/07/uabmm2-unfurled-2.html

[z.monkey]

Here I've got the perimeter of the Poly rotor cutout, and got the Mini Mill setup to cut the slots.  It took a few hours to cut all 36 slots.  The magnets do fit tight, but its not like a jam fit like I want, so I'll need to find another way to secure the magnets.  I'm thinking about wrapping the perimeter with electrical tape, or if need be use epoxy.  I can't wait to get to testing.

[z.monkey]

This morning I depopulated the eight degree rotor to put the magnets on the ninety degree rotor.   On the new rotor the magnets fit well in the slots, but they are not "jammed in" tight.  They need some help maintaining their position.  So I wrapped the perimeter with electrical tape for a test spin.  The electrical tape didn't last long, but I got a few spins in.  The rotor doesn't have the strong cogging like it had with the other two rotors.  It is much easier to start and spins longer with when you give it a spin.  Then the electrical tape tore, and bunched up in the clearance between the rotor and the stator.

http://scientilosopher.blogspot.com/2012/07/uabmm2-unfurled-4.html

[z.monkey]

I haven't had much time to mess with the UABMM2 lately, been working on work for a change.

Had some interesting problems with a 377 pin micro BGA...

http://black-dog-technologies.blogspot.com/2012/08/dogboned-bga.html

But got those worked out, and hopefully into manufacturing...

http://black-dog-technologies.blogspot.com/2012/08/single-channel-pcie-board.html

Also did a logic design recently with 74HC CMOS Logic, that was cool...

Maybe soon I will be able to get back to working on the UABMM2...

[FR Turbo]

Amazing amount of work done here...but what happened, thread went completely dead!?