Capacitance calculus of a bearing

[logic5]

I would like to calculate theoretically the capacitance of a bearing with metallic rings and ceramic spheres (see http://en.wikipedia.org/wiki/Rolling-element_bearing.

The expression for a cylindrical capacitor is: (2*pi*eps0*l)/(lnb/a).

However, when adding some spherical balls inside the cylinder, how should I proceed?

Thank u,



logic

 

[berkeman]

That's a tough one. It may take a numerical software package (like QuickField or ANSYS) to calculate that capacitance. Do you have any FEA/Electrical calculation software packages available?

 

[logic5]

Unfortunately I haven´t... what a pity!
Anyway thank u for telling me it is not that simple.