Abstract: An electric motor stator includes a magnetic circuit having a plurality of radial polar protuberances. The stator has, for all or some of said protuberances, a set of conductive zones in the general shape of a U, disposed around the protuberance, and the ends of each of the conductive zones are located in the vicinity of a common plane. The stator also has at least one connection component including a plurality of conductive tracks connected to distinct ends of said conductive zones, so as to define a DC electric circuit forming a winding around one or more radial polar protuberances.

Abstract: An electric motor stator includes a magnetic circuit having a plurality of radial polar protuberances. The stator has, for all or some of said protuberances, a set of conductive zones in the general shape of a U, disposed around the protuberance, and the ends of each of the conductive zones are located in the vicinity of a common plane. The stator also has at least one connection component including a plurality of conductive tracks connected to distinct ends of said conductive zones, so as to define a DC electric circuit forming a winding around one or more radial polar protuberances.

Abstract: The electrical machine according to the invention is a dual machine, and comprises a first machine which can be reversed and a second machine functioning through induction between two windings. The second machine can be used for de-icing a propeller, the induction-receiving winding being mounted on the propeller shaft. The first electrical machine can function as an electrical engine to ‘taxi’ the aircraft. In certain embodiments, the winding mounted on the stator is common to the two machines and different magnetic flows are utilised to control them. A separate functioning of the two machines and a very good integration into the aircraft engine, with space-saving and low mass, are possible.

Abstract: The subject matter of the invention is a pipe (2) forming part of a heat exchanger. The pipe (2) is delimited by at least one wall (4, 7) for separating a fluid (3) circulating in the pipe (2) and an external medium (6). The wall (4, 7) is equipped with means (8) of deforming the wall (4, 7). These arrangements are such that at least one of the walls (4, 7) of the pipe (2) is actively deformed, in a precise and controlled manner, by the deformation means (8) in order to precisely conform and configure said, wall (4, 7), the use of the deformation means (8) being in particular placed under the influence of control means in relationship with the deformation means (8).

Abstract: The invention relates to the detection of liquid in a cavity of a structure, e.g. a sandwich-structure cell with honeycomb core and carbon fiber composite coating. The structure is subjected to a mechanical vibration, at a frequency fm in the audible range, by an excitation wave, the area being explored is subjected to an incident electromagnetic wave and the reflected electromagnetic wave is analyzed to deduce therefrom the presence or the absence of liquid in cavities. The Faraday wave induced on the surface of the liquid in the cavity comprises subharmonic frequencies of fm which modulate the reflected electromagnetic wave and make it possible to identify the presence of liquid. A detection apparatus comprises an excitation wave generation device for generating the vibration excitation wave, an electromagnetic wave generation device for generating the incident electromagnetic wave, a measuring device for detecting and measuring the reflected electromagnetic wave, and a signal processor.

Abstract: The invention relates to the detection of liquid in a cavity of a structure, e.g. a sandwich-structure cell with honeycomb core and carbon fiber composite coating. The structure is subjected to a mechanical vibration, at a frequency fm in the audible range, by an excitation wave, the area being explored is subjected to an incident electromagnetic wave and the reflected electromagnetic wave is analyzed to deduce therefrom the presence or the absence of liquid in cavities. The Faraday wave induced on the surface of the liquid in the cavity comprises subharmonic frequencies of fm which modulate the reflected electromagnetic wave and make it possible to identify the presence of liquid. A detection apparatus comprises an excitation wave generation device for generating the vibration excitation wave, an electromagnetic wave generation device for generating the incident electromagnetic wave, a measuring device for detecting and measuring the reflected electromagnetic wave, and a signal processor.

Abstract: A motor (1) includes a stator (4) and a rotor (6), the stator including piezoelectric actuators (11,12,21) for maneuvering staples (30A, 30Z) maintaining the stator and its linear displacement (L) along a guide (2), the actuators serving to drive the rotor in rotation (R).

Abstract: A motor (1) includes a stator (4) and a rotor (6), the stator including piezoelectric actuators (11,12,21) for maneuvering staples (30A, 30Z) maintaining the stator and its linear displacement (L) along a guide (2), the actuators serving to drive the rotor in rotation (R).

Abstract: A rotary piezoelectric motor (1) in which a geometrical asymmetry can be introduced, e.g. in the counter-masses (11, 14) or in the stator fixing elements (10), in order to produce a phase shift previously obtained using a phase quadrature power supply. A simplified single-phase power supply (40) can be used with one such motor. The inventive motors offer advantages in terms of cost and reliability, particularly for motors that require only a single direction of rotation. The motors are particularly suitable for small motors such as those used for clock and watch making, microsurgery or microelectronics.

Abstract: Supply circuit for a piezo-electric motor comprising a rotor driven, by friction, by a stator energized by at least two piezo-electric elements (P1, P2) supplied respectively with two alternating voltages (Vp, Va) of like amplitude and phase-shifted by approximately 90.degree. by means of a single source and of a means intended for generating the two phase-shifted voltages. This means consists of a capacitor (C), in series with one of the piezo-electric elements (P2), whose value is chosen so that for a given frequency of the voltage of the source (S), substantially the same voltages and a phase-shift of 90.degree. is obtained. The voltage of the source is advantageously controlled, in frequency, by a processing logic unit (PLU).

Abstract: Circuit for supplying a piezoelectric motor (M) comprising a rotor (1) frictionally driven by a stator energized by a piezoelectric element (3) connected to two electrodes (11 and 12) supplied by two high frequency voltages (V.sub.1 ') and (V.sub.2 ') of the same amplitude, and phase shifted by approximately 90.degree.. According to the invention, the supply circuit comprises a single high frequency alternating supply source (V) and an adapting means (Q) connected to the alternating supply source (V) and to two electrodes (11 and 12) energizing the piezoelectric element (3) and generating both voltages (V.sub.1 ') and (V.sub.2 '). The invention is for use in piezoelectric motors.

Abstract: A rotating machine comprises a stator that is excited to vibrate to generate progressive surface waves at a frequency within a resonance frequency range of a predetermined rank. The rotor is designed so that the vibrations in the stator generate vibrations of the same frequency and of lower magnitude. A vibration sensor is mounted on the rotor to provide a signal. The difference in frequency between the excitation frequency of the stator and the vibration frequency detected on the rotor corresponds to the rotation speed of the rotor.

Abstract: A motor includes two parts that are mobile one with respect to the other and have facing surfaces contacting each other. Progressive surface acoustic waves of the same direction are produced in each facing surface of each part. The relative speed or position of the parts is adjusted by acting on the relative frequency or phase of the progressive waves.