Rigorous and Approximating Expressions for the Inductances of Circular and Square Solenoids
Abstract
Closed expressions for the inductances of circular and square solenoids are presented in a systematic manner. Transformed expressions written in terms of spherical Legendre functions with a semi-integer index are given. Both rigorous estimates of compression forces for circular and square solenoids written through derivatives with respect to generalized coordinates and using well-known approximating expressions are obtained. The new expressions are compared with the previously known ones. An appendix to the article contains derivation of the expression for the self-induction coefficient of a short circular solenoid based on the spherical Legendre functions with semi-integer indexes. The derived expression is compared with the well-known Wheeler’s and Lundin’s formulas.
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