Theoretical Characteristics of Generalized Electret Generator, Using POlymer Film Electrets

Abstract

A generalized electret generator using polymer film electrets is proposed. The rotor of the generator consists of a conducting disk and several fan-shaped pieces of two types of film electret, attached to the conducting disk with alternate polarity. The stator consists of a conducting disk with holes that have the same fan-shape as the electret. The generator has a slip ring and a brush. The generator becomes non-parametric when the two types of electret of the rotor have the same permittivity and thickness, and parametric when the two electrets differ. The fundamental characteristics of the generators are very similar, and the output voltage, current, and power of the non-parametric generator are larger than those of the parametric generator under the same conditions. The output voltages and currents of both generators are proportional to a linear combination of the surface charge densities of the two electrets. The output power is proportional to the second power of the above linear combination.