What does the variable "k" mean in the solenoid equation in the picture attached?
Many thanks for the help.
Source: Theory & Practice of Electromagnetic Design of DC Motors & Actuators
George P. Gogue & Joseph J. Stupak, Jr.
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Voltage Spike
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1Link to the original document? – Andy aka Mar 09 '18 at 00:40
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http://www.consult-g2.com/course/chapter11/chapter.html – Martin K Mar 09 '18 at 00:56
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1@MartinK The equations are immediately above the curve. Can't you guess, just by inspection, the implied meaning of $k$? Just look up slightly and I think you can see the factors in play there. (Nice page, by the way.) – jonk Mar 09 '18 at 02:00
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See the link, equations 11.41 and 11.50. – WhatRoughBeast Mar 09 '18 at 03:37
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so k=Uo/2Agn^2*i^2 ??? Sorry but I am not good at maths :) – Martin K Mar 09 '18 at 05:07
1 Answers
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This might help: -
Force = \$(N\cdot I)^2\cdot 4\pi 10^{-7}\cdot \dfrac{A}{2g^2}\$
- F = Force
- I = Current
- N = Number of turns
- g = Length of the gap between the solenoid and the magnetizable metal
- A = Area
If current, area and turns are constant, Force is inversely proportional to the gap squared (\$\ell^2\$). Formulas taken from this question.
Andy aka
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