The invention relates to a demonstrative model for studying the operation principle of an electrostatic motor with electrets, resulting from the analogy with the D.C. motor. According to the invention, the demonstrative model is a device consisting of a stator assembly consisting of two pairs of conductive armatures (1a, 1b and 1'a, 1'b), which comprises inside a rotor assembly, coaxially mounted and consisting of two electret plates (7, 7'), coaxial with the stator, where the conductive armatures (1a, 1'a) are fixed on a detachable electrically insulating support (2) and the other armatures (1b, 1'b) are fixed on a fixed electrically insulating support (3); the support (2) is secured by means of some threaded rods (5, 5') placed on the fixed support (3), as well as by means of some butterfly nuts (6, 6'); the rotor is placed within an electrically insulating hub consisting of two electrically insulating discs (8, 8') pressed onto the two electret plates by means of a butterfly nut (9) placed on the threaded portion of a shaft (10) which is the motor shaft; the rotor is mounted on the stator by means of a slide bearing (11) and of a pivot bearing (12), the supply being achieved by means of some metallized zones (4, 4').
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