Appendix B

Calculations of Permeances

B.1 Field Plotting

The procedure to be followed in field plotting is simple. On a diagram of the magnetic circuit, several equipotential lines are drawn. Flux lines connecting the surfaces of opposite polarity are then added in such a manner so as to fulfill the following requirements:

  • All flux lines and equipotential lines must be mutually perpendicular at each point of intersection.

  • Each figure bonded by two adjacent flux lines and two adjacent equipotential lines must be a curvilinear square.

  • The ratio of the average width to average height of each square should be equal to unity.

When the full plot has been completed (Fig. B.1), the magnetic permeance can be found by dividing the number of curvilinear ...

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