Rare Earth Magnet Cubes for Hallbach Arrays and other Applications

Nd Rod Magnet Specifications

The rod magnets are N42 ~13,000 gauss (1.3T-N42 grade) which is a theoretical maximum value. Field strengths have been calculated using finite element analysis at the surface and 4 places above the central point and are estimated to be within 10% of actual. For surface measurements, these values are more accurate than a magnetometer since such devices have an airgap of at least 0.1mm between the magnet and sensor.

The holding forces are also theoretical maximums are dependent on the permeability, thickness and area of the metal used. The attractive/repulsive force of 2 identical magnets is double this value.

nickel coated
size tolerance is +/- 0.1mm
80C maximum operating temperature

~25mm (2.5cm) = ~1 inch; 2.5mm (0.25cm) = ~ 1/10 inch; 3E=x 1000.

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Field Strengths (in gauss) at 5 Distances (in mm); Holding Force in 3 Units

Size

0.1

100

lbF

gms

2.5x2.5

5.90E+03

5.42E+03

2.09E+03

1.82E+01

2.00E-02

0.9

393

2.5x5

6.40E+03

5.88E+03

2.34E+03

2.82E+01

5.00E-02

1.7

788

2.5x7.5

6.50E+03

5.99E+03

2.41E+03

3.42E+01

7.00E-02

2.6

1181

2.5x10

6.54E+03

6.02E+03

2.43E+03

3.81E+01

9.00E-02

3.5

1574

2.5x12.5

6.56E+03

6.04E+03

2.45E+03

4.08E+01

1.10E-01

4.3

1968

5x5

5.90E+03

5.66E+03

3.64E+03

1.07E+02

1.90E-01

3.5

1574

5x7.5

6.26E+03

6.01E+03

3.88E+03

1.31E+02

2.80E-01

5.2

2362

5x10

6.40E+03

6.14E+03

3.98E+03

1.46E+02

3.60E-01

6.9

3149

7.5x10

6.18E+03

6.01E+03

4.55E+03

3.07E+02

8.00E-01

10.4

4724

7.5x12.5

6.32E+03

6.15E+03

4.66E+03

3.30E+02

9.70E-01

13.0

5904

7.5x15

6.40E+03

6.23E+03

4.73E+03

3.47E+02

1.13E+00

15.6

7085

7.5x22.5

6.51E+03

6.34E+03

4.82E+03

3.77E+02

1.55E+00

23.4

10628

104

7.5x25

6.53E+03

6.35E+03

4.83E+03

3.83E+02

1.67E+00

26.0

11809

116

10x10

5.90E+03

5.78E+03

4.71E+03

5.00E+02

1.43E+00

13.9

6298

10x15

6.26E+03

6.13E+03

5.01E+03

5.69E+02

2.01E+00

20.8

9447

10x25

6.47E+03

6.34E+03

5.19E+03

6.30E+02

2.96E+00

34.7

15745

154

12.5x12.5

5.90E+03

5.81E+03

4.95E+03

7.62E+02

2.69E+00

21.7

9835

12.5x25

6.40E+03

6.30E+03

5.37E+03

9.00E+02

4.62E+00

43.4

19671

193

15x25

6.32E+03

6.24E+03

5.47E+03

1.17E+03

6.64E+00

52.0

23603

231

20x20

5.90E+03

5.84E+03

5.30E+03

1.59E+03

9.96E+00

55.5

25177

247

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