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

  • Magnet Grade: N42
  • Hc Value: 1.031*106 A/m
  • Approximation Used: 40MGOe
  • Physical Dimensions: Radius 1/4", Length 2"

Nodes:

  • 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

  • Magnet Grade: N42
  • Hc Value: 1.031*106 A/m
  • Approximation Used: 40MGOe
  • Physical Dimensions: Radius 1/4", Length 2"

Nodes:

  • 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

  • Magnetic Grade: N45
  • Hc Value: 1.068*106 A/m
  • Approximation Used: 50MGOe
  • Physical Dimensions: Inner Radius 1" Outer Radius 2"

Nodes:

  • 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

  • Magnetic Grade: N45
  • Hc Value: 1.068*106 A/m
  • Approximation Used: 50MGOe
  • Physical Dimensions: Inner Radius 1" Outer Radius 2"

Nodes:

  • 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

  • Magnetic Grade: N42
  • Hc Value: 1.031*106 A/m
  • Approximation Used: 40MGOe
  • Physical Dimensions: Radius 1/4", Length 5"

Nodes:

  • 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: Complex neodymium.JPG

and the field lines and intensities:

Complex neodymium field.JPG