Rigorous and Approximating Expressions for the Inductances of Circular and Square Solenoids

  • Georgy N. TSITSIKYAN
  • Mikhail Yu. ANTIPOV
Keywords: solenoid inductance, transformed expressions, Legendre functions, compression forces, self-induction coefficient, comparison with well-known formulas

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.

Author Biographies

Georgy N. TSITSIKYAN

TSITSIKYAN Georgy N. (Krylov State Research Centre, SET Branch, St. Petersburg, Russia) — Deputy Head of Dept., Academic secretary of Scientific and Technical Cobncil, Dr. Sci. (Eng.)

Mikhail Yu. ANTIPOV

ANTIPOV Mikhail Yu. (Krylov State Research Centre, SET Branch, St. Petersburg, Russia) — 1nd Category Design Engineer

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Published
2019-11-20
Section
Article