User:Brian P. Josey/Notebook/2010/03/31

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Complex Neodymium Again
I'm continuing where I left off yesterday in my pursuit to make a decent model of the neodymium yoke.

Upper Cross Cylinder
Nodes:
 * Magnet Grade: N42
 * Hc Value: 1.031*106 A/m
 * Approximation Used: 40MGOe
 * Physical Dimensions: Radius 1/4", Length 2"
 * Left Side Upper: (1.5,3.5634)
 * Left Side Lower: (1.5,3.5426)
 * Right Side Upper: (3.5,3.55746)
 * Right Side Lower: (3.5,3.54854)

This is the magnet that connects the side of the yoke with the gap, to the other half. Because it is laid on it's side in the model, I have to keep the area of the base touching the bends consistent and equal to 0.19635 in2. This creates a ring in the model that it thicker towards the center than the outside. Also, because the magnets are getting farther away from the axis the lengths I am using are becoming shorter.

Lower Cross Cylinder
Nodes:
 * Magnet Grade: N42
 * Hc Value: 1.031*106 A/m
 * Approximation Used: 40MGOe
 * Physical Dimensions: Radius 1/4", Length 2"
 * Left Side Upper: (1.5,-3.5634)
 * Left Side Lower: (1.5,-3.5426)
 * Right Side Upper: (3.5,-3.55746)
 * Right Side Lower: (3.5,-3.54854)

This is the same magnet as the "Upper Cross Cylinder" but on the opposite side of the yoke, the bottom of the model.

Upper Right Bend
Nodes:
 * Magnetic Grade: N45
 * Hc Value: 1.068*106 A/m
 * Approximation Used: 50MGOe
 * Physical Dimensions: Inner Radius 1" Outer Radius 2"
 * 0o Outer: (4.5353,2.5)
 * 0o Inner: (4.5,2.5)
 * 30o Outer: (4.3975,3.0182)
 * 30o Inner: (4.366,3.0)
 * 60o Outer: (4.0199,3.4005)
 * 60o Inner: (4.0,3.366)
 * 90o Outer: (3.5,3.53026)
 * 90o Inner: (3.5,3.57574)

This is the bend on the opposite side of the yoke from the gap. Again, I am using the cone method from Monday to determine the points along this bend.

Lower Right Bend
Nodes:
 * Magnetic Grade: N45
 * Hc Value: 1.068*106 A/m
 * Approximation Used: 50MGOe
 * Physical Dimensions: Inner Radius 1" Outer Radius 2"
 * 0o Outer: (4.5353,-2.5)
 * 0o Inner: (4.5,-2.5)
 * 30o Outer: (4.3975,-3.0182)
 * 30o Inner: (4.366,-3.0)
 * 60o Outer: (4.0199,-3.4005)
 * 60o Inner: (4.0,-3.366)
 * 90o Outer: (3.5,-3.53026)
 * 90o Inner: (3.5,-3.57574)

This bend is identical to the one above, I just switched the signs on the z-coordinate.

Long Cylinder
Nodes:
 * Magnetic Grade: N42
 * Hc Value: 1.031*106 A/m
 * Approximation Used: 40MGOe
 * Physical Dimensions: Radius 1/4", Length 5"
 * Upper Left: (4.5176,2.5)
 * Upper Right: (4.5245,2.5)
 * Lower Left: (4.5176,-2.5)
 * Lower Right: (4.5245,-2.5)

This is the cylinder magnet that is on the opposite side of the yoke from the gap.

Pictures
Here is what the model itself looks like in FEMM:

and the field lines and intensities:




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