Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
  • H02K41/06—Rolling motors, i.e. motors having the rotor axis parallel to the stator axis and following a circular path as the rotor rolls around the inside or outside of the stator ; Nutating motors, i.e. having the rotor axis parallel to the stator axis inclined with respect to the stator axis and performing a nutational movement as the rotor rolls on the stator
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
  • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
  • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
  • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
  • B06B1/04—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with electromagnetism
  • B06B1/045—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with electromagnetism using vibrating magnet, armature or coil system

Definitions

• the present invention relates to an electromechanical vibration generator which can be used in particular, but not exclusively; in the vibrating needles used to ensure the vibration of the concrete.
• the electromechanical generators used at present involve weights excen ⁇ trated relative to a rotary drive shaft, driven in rotation by a motor. These weights, when rotating, cause an imbalance capable of generating vibrations.
• the drive of the rotary shaft is ensured by an electric motor engaged with the shaft, either directly, by means of a gearbox, or even via a flexible cable transmission.
• the invention provides a vibration generator of the type comprising a body at least partially made of a magnetizable material and movable along at least one guide element so that its center of gravity can move along a closed curved path, and electromagnetic means for generating a rotating magnetic field capable of driving said body along the guide elements.
• this generator is characterized in that:
• the electromagnetic means consist of a central core
• said body has a hollow shape surrounding said core and subjected to the rotating magnetic field produced by the latter,
• - Said guide means comprise a guide track on which is supported, at all times, a generator different from an annular zone of the over- internal face of said body, when said body is driven by said magnetic field.
• the means ensuring the vibrations and the motor means form a single entity excluding any mechanical transmission system and any pivoting.
• the stator winding can be performed on a central core having polar blooming sailants.
• the excen ⁇ trated core constituting the rotor forms a crown suspended by its internal bore on the stator formed by the cen ⁇ tral core, by means of a cylindrical sheath of thickness equal to an air gap to respect.
• the eccentric core constituting the rotor forms a crown, an external wall of which rolls over the internal bore of the envelope constituting the concentric raceway, the internal diameter of the crown being such that it allows a suitable air gap to exist between the outer wall of the central core or stator and the bore of the crown constituting the eccentric core.
• the stator may include two series of inductors arranged at each end of the housing.
• the stator consists of two series of inductors arranged at each end of its central core.
• Figures la and lb are diagram ⁇ tick views, respectively in cross section and in axial section of a first embodiment of a generator according to the invention.
• Figure 2 is a schematic cross-sectional view of an alternative embodiment of the generator according to Figure 1, wherein the rotor is provided with a plurality of permanent magnets;
• Figure 3 is a schematic cross-sectional view of a second embodiment of the generator according to the invention.
• Figure 4 is a schematic cross-sectional view, corresponding to that of Figure 2 but in which the permanent magnets are replaced by axial cavities;
• Figures 5 and 6 are schematic cross-sectional views of vibration generators in which the rotors follow oval paths so as to favor
• FIG. 7 is a schematic view of a unidirectional vibrator produced by the association of several generators of the type of those represented in FIGS. 5 and 6;
• Figure 8 is a schematic axial section of a vibration generator capable of generating an adjustable torque.
• the vibration generator comprises:
• annular rotor 3 mounted freely in the intermediate space between the casing 1 and the stator 2, and
• the rotor 3 made of magnetizable material, is dimensioned so as to be able to roll freely by its internal cylindrical surface 5 on the external cylindrical surface 6 of the sleeve 4, and this, without its external cylindrical surface being able come to bear on the inner cylindrical surface of the casing 1.
• the rotor 3 can therefore perform a rotary movement during which its axis 0 ′ sweeps a cylindrical surface centered on the axis 0.
• the stator 2 has a structure substantially similar to that of a wound rotor of an asynchronous machine. It is produced for example using a stack of discs made of silicone sheet provided with a plurality of notches T_ to T4 delimiting between them polar expansions N, S around which are wound windings, not shown .
• the excitation of the windings is carried out in sequence so as to generate a rotating magnetic field, the pole shoes having alternating North (N) and South (S) polarities.
• the sleeve 4 which here extends over the entire length of the stator 2, serves both as a raceway for the rotor 3 as well as for the réali ⁇ tion of the air gap.
• the variant embodiment shown in FIG. 2 essentially differs from the previous one in that the bore 3a of the eccentric core 3 in the form of a crown and constituting a part activated by the rotating field, is equipped with a plurality of 'permanent magnets A, B, C, D, E, F arranged radially and equidistantly at a pitch identical to that of the windings (not shown) of the poles N, S of the stator 2.
• the movement of the said magnets in operation is represented fictitiously by the positions A ', B', C ', D', E ', F' given by way of illustration.
• the embodiment represented in FIG. 3 differs essentially from that of FIG. 1 in that the eccentric core constituting the rotor forms a crown 3 whose external wall 3b rolls on the internal bore 1a of the envelope 1 thus constituting the concentric raceway following contact by an internal generator of the latter on an external generator of said crown 3 (the internal diameter "D" of the crown 3 being equal, for a given point, to the distance "d "from a point P of the bore 3a of the crown 3 to a diametrically opposite point P 'situated on the external wall 2a of the stator 2, plus the air gap distance" e ").
• the permanent magnets A to F and G to J, respectively included in the eccentric core 3 in the form of a crown can be replaced by axial recesses respectively 31 to 35 occupying substantially the same place and which make it possible to create similar polarities (FIG. 4).
• the rotors are guided by circular surfaces, so that their centers of gravity themselves make circular paths.
• the invention is not limited to such a feature.
• it proposes to take advantage of the specific structure of the generators described above in order to obtain, with simple shape modifications, an oval trajectory of the rotor and, consequently, vibrations having maximum amplitudes along an axis. privileged.
• the generators described above can be used to produce apparatuses for generating unidirectional vibrations using one or more pairs of generators, for example two pairs as shown in FIG. 7.
• the generator involves two pairs of structures of the type shown in FIG. 5, the central cores 40 to 43, integral with each other, are oriented parallel to each other and are oriented in the same direction.
• the two structures Si, S2 - S3, S4 of the same pair present:
• the longitudinal axes of the cores 42, 43 - 40, 41 form the edges of a prismatic volume of square section.
• the amplitude of the vibrations generated by the previously described apparatus could also be adjusted by varying the orientation of the central cores 41 to 44, with respect to each other.
• the rotor 50 which has the shape of a tubular section rolls by its two chamfered ends 51, 52 on two respective frustoconical raceways 53, 54, coaxial 1 to 1 other and movable one with respect to the other.
• This structure allows adjustment of the eccentricity of the rotor 50 and therefore of the amplitude of the vibrations generated, by a simple adjustment of the spacing of the two frustoconical raceways 53, 54.
• Such adjustment of the amplitude of the vibrations could also be obtained by means of a generator of the type shown in FIG. 7, involving at least a pair of structures Si, S2 or S3, S4.
• the controlled variation of the amplitude of the vibrations is ensured by generating a phase shift in the excitation cycles of the windings of the cen ⁇ traux cores 40, 41 or 42, 43, thanks to an appropriate switching circuit.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Power Engineering (AREA)
• Mechanical Engineering (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
• Apparatuses For Generation Of Mechanical Vibrations (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 1990
  • 1990-03-02 FR FR9003202A patent/FR2659033B1/fr not_active Expired - Fee Related
• 1991
  • 1991-03-01 JP JP50578591A patent/JPH04505696A/ja active Pending
  • 1991-03-01 EP EP19910905830 patent/EP0471059A1/de not_active Withdrawn
  • 1991-03-01 WO PCT/FR1991/000178 patent/WO1991012901A2/fr not_active Application Discontinuation

Non-Patent Citations (1)

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