We could also tinker with the Flux Ring material. Though we’re really close, the problem is that there is only one manufacturer that has those exact perimeters. The integral across the diagonal yields an Average B.n = -0.773328 Tesla which is LESS THAN the Halbach Array at 5 mm high.
So let’s make them ¼-inch/6.35 mm high and run the FEMM calcs as they were N52 with the Flux Ring backing plates.
Surprised by the volumetric similarity? Now the rub: You can’t buy 1-inch x ½-inch x 5 mm high magnets. The total area = 0.01032256 * 3 = 0.03096768 m^2.ĭivide HA Volume by NHA Area to get NHA height: The Inner Rotor has the same amount of magnets Using British/American Units, let’s calculate the Area. Inner Rotor uses ½ the magnets = 2.827 x 10-5 m^3 Let’s run a quick calculation to see how much taller these magnets would become for NHA… We understand that the HA shapes are volumetrically different. Now imagine that I would like to meet or exceed this with off-the-shelf materials Using that model, after I added the windings to the model and put current through them, the integral across the diagonal yielded an Average B.n = 0.81119 Tesla which is quite impressive.
If I were to create an AF HA motor it is likely I would have chosen the 5 mm thick 3-Rotor/2-Stator design, and the calculations were completed up to that point to permit cost analysis. I do believe you have a valid point though about adding more material: What happens if we attempt to use the same amount as in the HA? The first thing we need to understand is that the geometries are not the same: An AF HA uses wedge-shaped magnets whereas we are using Bar-shaped, or cubes assembled into bars Apples and Oranges.
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