GB643579A - Electrostatic generating machines - Google Patents

Abstract

643,579. Electrostatic machines. CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE. July 15,1947, No. 18870. Convention date, July 17, 1946. [Class 35] A cylindrical type electrostatic generator enclosed in a gas-filled container 13 comprises a stator with an even number of part-cylindrical conducting segments 3, 4 and a rotor carrying outwardly facing part-cylindrical conducting members corresponding to those on the stator, the rotating conductors being divided into at least two longitudinally separated groups, each group forming a rotor of the machine, one providing excitation for the other. In the form shown, where two rotors are used, the conducting segments 7<SP>1</SP>, 8<SP>1</SP> provide excitation through brushes 11<SP>1</SP>, 12<SP>1</SP> for the stationary segment 3 which in turn influences the main rotor segments 7, 8, these being connected in turn by brushes 11, 12 to feed the other stationary segment 4 and the output lead 14. The insulating rotor cores 5, 5<SP>1</SP> supporting the rotor segments, also carry contact sectors 9, 10 and 9<SP>1</SP>, 10<SP>1</SP> respectively, these sectors being of substantially less angular extent than the rotor segments. The active edges of the stator and rotor segments are of rounded form and have a marginal thickness equal to at least two-thirds of the gas space between stationary and rotatable members. The capacity between rotor segments is reduced by using an insulator of low dielectric constant and cutting it away round the active edges. In a modification, the machine has two auxiliary rotors connected in succession and the machine may have several pairs of segments on the stator and rotor. Specification 637,434 is referred to.