coil wound alternators are used everywhere to Generate electric power in all kind generating stations.Though it is demonstrated by vande graf (static generator) it is is not popular in power generation. Let me know the limitations and constraints ifany
The main reason is: the relative permeability µr of the cheap iron is much higher (~10000 or more) than the relative permittivity εr (~5) of all materials. The difference will perhaps be clearer if you replace an electric generator by an electric motor. If you remove the iron from the coils, the efficiency drops from 95% to few percents. Long time ago, i studied an experimental electrostatic motor (U=30 kV). The efficiency was as low as 3%.
A second reason: It is very hard to avoid Corona discharge losses in high-voltage electrostatics. Coils require much lower voltages and are much simpler to isolate.
https://en.wikipedia.org/wiki/Permeability_(electromagnetism)
https://en.wikipedia.org/wiki/Relative_permittivity
I think that Weidner and Cornwall fully covered the topic. Well done.
Dear Hashem Azizi
The power output of static generators is low when compare to magnetic generators and magnetic generators are more power dense than electrostatic ones.kindly refer the link.
https://www.google.com/patents/US1991236
Thank you Herbert for the explanations. Do you have more results to share on the electrostatic motor you developed?
Regards
Hello Dear Hashem, I'm agree with colleagues answers here before the basics of physics phenomena and équations are well analysed.
I add that for industrial applications electromagnetic forces are with relatively higher density of energy , more sutabale and better developped. High rigidity and strength of ferromanetic and metallic materials are easier to implement . There is an evident flexibility in shapes and design of different motors or generators parts, electon mobility in well insolated coils and wires allows easier control of magnetic forces and torque by electrial current in one hand, in the other hand, the voltage allows better contol of velocities.
Electro
It is easy to built saller or bigger compact electomagetic generators and motors for différent voltage scales of and power.
But we did not discard electrostatic generators and motors innovative concepts can be designed and developped. The micro ionic motors for sattlite orbit control are very economic and efficient .
You can investigate in the way of low energy and forces for special fields ( Vacum for example ) .
Best wishes for your resarch investigations
Alongwith static generators you can consider energy from evaporative engine
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