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Sorry guys for such a slow work progress but my workload is getting high. I'm still the only engineer here and I haven't had any time to work on "government" projects. Anyway, I am still laying out the "donut" board for phase one (stock rotor>points>atmel>coils). Phase 2 is modified rotor>Hall Effect>atmel>coils. The board will be able to use either points or Hall Effect so it allows us to use the points in the interim while developing the modified rotor. Q7 and Q8 are the Hall Effects (90 degrees apart). Matt, let me know if the HE parts are in the correct position. I have one more trace to connect. Will need to review the design thoroughly before sending the files out for boardmaking. The long lead time of course is the software. More space can be saved by going SMT on some parts but all the parts fit.
Looking good, Eric. I'm surprised you were able to fit all those parts on the board. I had always figured it was going to be a child board setup with just the HEs and maybe some caps.
For the code I've written so far, I was expecting Q7 and Q8 to be 175° degrees apart. We can change it, but one of the sensors will want to be closer to the edge of the board and the other will need to be closer to the middle. I was thinking two magnets on different tracks rather than a single magnet. If it's a huge hassle, don't worry about it though.
I think one as close as you can get to the inside adjust of the PCB and the other as close as you can get to the outside edge. Whichever works out best for the layout of the board, as I suspect the location of the magnets on the rotor will be a lot easier to adjust than the location of the HEs.
Still at 175 deg apart (Q7 at 0?)? 175 degrees will be close to P6 (bottom right edge). If I put Q8 at the outer edge (62mm OD), how will the rotor reach it?
You need to dbl chk those dims. The outer radius of the pcb is at 1.225" (62 mm OD) and the inner radius is 0.425". The Q7 would be almost off the edge and Q8 is clear off. I might have the pcb wrong too. I can't remember if I made the pcb in mm but the components are normally in inches (0.100 or 0.200" spacing).
This is an excellent project. How is the progress? Im an EE with a 360 as well, so if you need a hand let me know. Im good with embedded SW & HW, its what I do.
If the rotor clears the head it should be good to go.
Did you figure out what size magnet you need to trigger hall effect sensor?
Originally I bought some 3/16"x1/16" but they were just too weak.
Got some 1/4"x1/8" but totally stalled out on project
If memory serves (and I'm getting old so it may not lol) magnetic fields decay exponentially with distance. So your two options to get a stronger signal are to move the magnet closer or use bigger magnets.
As long as you have enough space to allow the rotor to expand with heat you should be good to go.
I think the 1/4" will work?
Just about sure it can run 0.50~ 0.75mm and expansion won't be too much of an issue
There shouldn't be more than 0.012" on diameter and probably less than 0.002" on thickness
If it does rub when hot, a 0.50mm shim under rotor would move things far enough
I think the 1/4" will work?
Just about sure it can run 0.50~ 0.75mm and expansion won't be too much of an issue
There shouldn't be more than 0.012" on diameter and probably less than 0.002" on thickness
If it does rub when hot, a 0.50mm shim under rotor would move things far enough
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