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WO2011092223A2 - Générateur électromagnétique - Google Patents

Générateur électromagnétique Download PDF

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Publication number
WO2011092223A2
WO2011092223A2 PCT/EP2011/051093 EP2011051093W WO2011092223A2 WO 2011092223 A2 WO2011092223 A2 WO 2011092223A2 EP 2011051093 W EP2011051093 W EP 2011051093W WO 2011092223 A2 WO2011092223 A2 WO 2011092223A2
Authority
WO
WIPO (PCT)
Prior art keywords
oscillator
magnetic
magnet
electromagnetic generator
generator according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2011/051093
Other languages
English (en)
Other versions
WO2011092223A3 (fr
Inventor
Thomas Becker
Jürgen Heinz
Martin Kluge
Gerhard KRÖTZ
Sebastian MÖST
Tommy Umbreit
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HOCHSCHULE KEMPTEN
Airbus Defence and Space GmbH
Original Assignee
HOCHSCHULE KEMPTEN
EADS Deutschland GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HOCHSCHULE KEMPTEN, EADS Deutschland GmbH filed Critical HOCHSCHULE KEMPTEN
Publication of WO2011092223A2 publication Critical patent/WO2011092223A2/fr
Anticipated expiration legal-status Critical
Publication of WO2011092223A3 publication Critical patent/WO2011092223A3/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K35/00—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
    • H02K35/02—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving magnets and stationary coil systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/18—Machines moving with multiple degrees of freedom

Definitions

  • Electromagnetic Generator The invention relates to an electromagnetic generator comprising :
  • a magnetic oscillator which is provided with at least one oscillator magnet and which is arranged for performing a pivoting motion, if the electromagnetic generator is vibrat- ing;
  • a magnetic stator provided with at least one stator magnet, which interacts with the at least one oscillator magnet and creates a repulsive force on the oscillator driving the oscillator, if displaced from the rest position, back to the rest position;
  • the magnetic oscillator is formed by a moveable member mounted in a case.
  • the moveable member is further provided with perma- nent magnets, which interact with fixed magnets disposed on an opposite side besides the moveable member.
  • the moveable member is further connected to a magnetic excitation circuit, which creates a magnetic flux through a stationary coil located within the magnetic excitation circuit.
  • the coil extends along a tangential direction of the pivoting motion and the magnetic flux is created by permanent magnets creating a magnetic field, which extends in a radial direction with respect to the pivoting motion through the coil.
  • One disadvantage of the known electromagnetical generator is that the generator can only be used for vibrations with frequency components in the low frequency range.
  • the mechanical energy of the vibrations is only transformed into electrical energy if the mechanical forces act in the direction of a possible motion of the moveable member.
  • the present invention seeks to provide an electromagnetic generator, which converts mechanical energy of vibrations more efficiently into electrical energy.
  • the electromagnetic generator comprises a magnetic oscillator provided with at least one oscillator magnet and a magnetic stator provided with at least one stator magnet.
  • the polarity of the at least one oscillator magnet and the at least one stator magnet vary in a radial direction with respect to the pivoting motion.
  • the radial direction of the pivoting motion should be understood as being a radial direction with respect to the center of the pivoting motion.
  • the electromagnetic generator is further arranged such that the magnetic oscillator has more than one degree of freedom for its pivoting motion. Generally there will be two degrees of freedom for the pivoting motion.
  • the repulsive force can be adjusted to a large frequency range and the magnetic oscillator can have more than one degree of freedom for its pivoting motion.
  • the magnetic oscillator comprises a series of oscillator magnets along a radial direction from the pivot point, wherein the polarities of the magnets are aligned along a radial direction with respect to the pivoting motion.
  • the oscillator magnets can be each associated with a stationary stator magnet having an inner opening through, which the magnetic oscillator extends. Such an arrangement of oscillator magnets and stator magnets ensures the presence of a repulsive force independent from the direction of the pivoting motion of the magnetic oscillator.
  • Such an arrangement of oscillator magnets and stator magnets further allow to adjust the magnetic force acting in a radial direction with respect to the pivoting motion. If an oscillator magnet is located near enough to its associated stator magnet, an attractive magnetic force between a stator magnet and oscillator magnet acts in a radial direction of the pivoting motion.
  • the magnetic force acting in radial direction of the pivoting motion can be compensated by a mechanical force.
  • This mechanical force might be provided by a support, which holds a tip of the magnetic oscillator, wherein the contact point between tip and support functions as a pivot point for the pivoting motion.
  • the support then exerts a pressing force on the magnetic oscillator in equilibrium with the magnetic force between the at least one stator magnet and the at least one oscillator magnet.
  • the magnetic force in radial direction of the pivoting motion can also be compensated by a connecting element exerting a drag force on the magnetic oscillator in equilibrium with the magnetic force between the at least one stator magnet and the at least one oscillator magnet.
  • the magnetic oscillator can be rotationally symmetric with respect to a longitudinal axis extending in a radial direc- tion of the pivoting motion.
  • the repulsive force in tangential direction is uniform and independent from the direction of the pivoting motion.
  • stator magnets may have a ring shape ensuring a repulsive magnetic force, which is independent from the direction, in which the magnetic oscillator is displaced from the rest position.
  • the conductor arrangement can comprise a coil, wherein the magnetic oscillator passes through the inner opening of the coil and the oscillator is provided with magnets generating a magnetic field passing through the coil along the longitudinal axis of the coil.
  • the conductors of the coil extends essentially along a tangential direction with respect to the pivoting motion.
  • the electromagnetic generator is provided with a conductor arrangement comprising a coil wound around a yoke, having a stationary part and a moveable part, which is connected to the magnetic oscillator.
  • the yoke is further provided with yoke magnets generating a magnetic flux in the yoke.
  • the yoke is also provided with an air gap between the stationary part and the oscillator part, which is delimited by stationary pole pieces and oscillatory poled pieces.
  • the air gap has the shape of a spherical segment resulting in a minimized air gap at the rest posi- tion.
  • the change of the magnetic flux through the poled pieces can further be increased by providing the poled pieces with grooves, which may extend along a circle centered on the longitudinal axis of the magnetic oscillator in the rest position .
  • the grooves extend in radial direction from the longitudinal axis of the magnetic oscillator in the rest position.
  • the stationary pole pieces and the moveable pole pieces taper towards the air gap.
  • a central pole piece of the yoke is provided with a central part located opposite to the other central pole piece, and is further provided with a protrusion extending towards an opposite outer pole piece.
  • the central part and the opposite central pole piece are provided with a central recess.
  • the electromagnetic generator is particularly suitable for providing electric power to a remote sensor, which cannot be connected to a power line and therefore needs its own power source.
  • Such sensors may also be provided with a transmitter for wireless transmission of sensor data to a remote station, where the sensor data a further processed.
  • Figure 1 is a cross sectional view of an electromagnetic
  • Figure 2 is a diagram illustrating the distribution of the magnetic field around a stator magnet and an oscillator magnet of the electromagnetic generator of Figure 1;
  • Figure 3 is a further diagram illustrating the magnetic
  • Figure 4 is a perspective view of an inductor of the electromagnetic generator from Figure 1;
  • Figure 5 is a cross sectional view through a modified embodiment of an inductor
  • Figure 6 shows a cross section through an inductor with a spherical shaped air gap between pole pieces
  • Figure 7 is a view from above on the cross section of the pole pieces on opposite sides of the air gap in a displaced position
  • Figure 8 shows a cross section through a modified inductor, whose pole pieces are provided with circular grooves ;
  • Figure 9 is a view from above on the pole pieces of the
  • Figure 10 shows a cross section through a further inductor, whose pole pieces are provided with radial grooves
  • Figure 11 is a view from above on the pole pieces of the
  • Figure 12 shows a cross section through an inductor
  • Figure 13 is a view from above of the pole pieces of the
  • Figure 14 shows a cross section through an inductor with a central crown-shaped pole piece
  • Figure 15 is a view from above of the pole pieces of the
  • Figure 16 shows a cross section through a further inductor with a central crown-shaped pole piece
  • Figure 17 is a view from above of the pole pieces of the
  • Figure 18 is a further diagram illustrating the magnetic
  • Figure 19 shows a modified connection between housing and
  • Figure 20 shows a further modified connection between housing and oscillator.
  • Figure 1 is a cross sectional view of an electromagnetic generator 1.
  • the generator 1 comprises an outer housing 2, which has a cylindrical shape. Within the housing 2 a magnetic oscillator 3 is disposed. Oscillator 3 can perform a pivoting motion 4 within the housing 2, if the housing 2 is vibrating.
  • the electromagnetic generator 1 is further provided with a magnetic stator 5 which holds the oscillator 3 in a rest position 6.
  • the electromagnetic generator 1 is further provided with the inductor 7 for converting the mechanical energy of the pivoting motion 4 into electric energy.
  • the oscillator 3 is provided with a needle like tip 8, which rests on a support 9 mounted in a bottom 10 of the housing 2.
  • a contact point 11 between the needle like tip 8 and the support 9 forms the pivot point around which the pivoting motion 4 is performed.
  • the needle like tip 8 is connected to a conical part 12 of oscillator 3.
  • a central bore 14 is provided, in which the lower end of a threaded rod 15 is inserted.
  • the rod 15 passes through a central opening 16 of a coil 17 which is attached to the housing 2 and forms part of the inductor 7.
  • the inductor 7 further comprises a front yoke part 18 and a rear yoke part 19.
  • Permanent inductor magnets 20 and 21 are disposed on the side of the front yoke part 18 which is oriented towards the coil 17.
  • Further permanent inductor magnets 22 and 23 are disposed on the side of the rear yoke part 19, which is oriented towards the coil 17.
  • the polarity of the permanent magnets 20 to 23 is chosen such, that a magnetic circuit is formed through the coil 17.
  • a cylindrical part 24 is located, which extends through a central opening 25 of a ring shaped stator magnet 26, which is attached to the housing 2.
  • the cylindrical part 24 further abuts to an oscillator magnet 27, which interacts with the stator magnet 26 to form an attractive magnetic force, which presses the magnetic oscillator 3 towards the support 9.
  • the arrangement of cylindrical part 24, stator magnet 26 and oscillator magnet 27 repeats another two times along rod 15. The sequence finally termi- nates with a cylindrical part 28 at the back end of rod 15.
  • the front yoke part 18, the rear yoke part 19, the cylindrical part 24 and the oscillator magnets 27 each have a cylindrical shape and are provided with an inner bore through which the rod 15 passes.
  • the inner bore of these components can also be provided with a thread for positioning and fixing these components on the rod 15.
  • the generator 1 and in particular the oscillator 3 is rotationally symmetric around a symmetry axis S.
  • the oscillator 3 has three degrees of freedom: a pivoting motion around the x-axis and y-axis and a rotation around the z-axis.
  • a translational motion in the direction of the z-axis is unpratical since the magnetic force pressing the oscilla- tor 3 in place is strong enough for holding the oscillator 3 in place.
  • the conical part 12 and the cylindrical parts 24 are made from a material which is paramagnetic and has a high specific density such as tungsten.
  • the front yoke part 18 and the rear yoke part 19 are preferably made from a ferromagnetic material such as a material based on iron.
  • the center of gravity of the oscillator should be positioned within the inner and outer oscillator magnet 27 in order to avoid that the tip 8 is removed from the support 9 by any external force.
  • the inductor magnets 20 to 23, the stator magnets and the oscillator magnets are preferably made from rare earth metals such as NdFeB.
  • the magnetic forces between one of the stator magnets 26 and an associated oscillator magnet 27 depends strongly on the relative position of the oscillator magnet 27 with respect to the stator magnet 26.
  • a radial direction 29 is a direction point- ing away from the contact point 11 between the needle like tip 8 and the support 9.
  • a tangential direction 30 is the direction at right angle to the radial direction 29.
  • Figure 2 is a diagram, in which magnetic field lines 31 illustrate the direction and the strength of the magnetic field.
  • Figure 2 is a cross section along the radial direction
  • the radial direction 29 is represented by an z-axis, while the tangential direction
  • Figure 30 is represented by an x-axis.
  • Figure 2 further contains the contours of one of the stator magnets 26 and one of the oscillator magnets 27.
  • the polarity of the magnetization of the stator magnet 26 and of the oscillator magnet is 27 aligned in the radial direction 29.
  • the polarity of the stator magnet 26 and the oscillator magnet vary along the radial direction 29.
  • stator magnet 26 must not necessarily be aligned in parallel with the symmetry axis S, but can also be arranged at a angle smaller 90° with respect to symmetry axis S.
  • stator magnet 26 may also be composed of several magnets which are arranged in a ring shaped manner around the symmetry axis, wherein the orientation of the magnetization of each of these several magnets may be inclined with respect to the symmetry axis S.
  • Figure 2 and 3 now illustrate two cases:
  • the magnetic force F between the stator magnet 26 and the oscillator magnet 27 is directed towards a tip 8 and pulls the stator magnet 26 and the oscillator magnet 27 together .
  • the distance h between the stator magnet 26 and the oscillator magnet 27 must sufficiently be narrowed down. Thus, the oscillator 3 is safely held in place.
  • the pressing force must not be too high, since the mechanical damping would otherwise become too strong, due to the friction between tip 8 and support 9.
  • the resonance frequency of the electromagnetic generator 1 can be adjusted.
  • the adjustment can be performed by adjusting the height of the support 9.
  • the support 9 can be a screw, whose height within the housing 2 is variable. By adjusting the height of the support, the resonance frequency of the generator 1 can be adapted to the actual frequency spectrum of the vibrations.
  • the oscillator 3 performs an oscillatory pivoting motion around contact point 11.
  • a current is induced in coil 17, since the magnetic field created by the inductor magnets 20 to 23 creates a changing magnetic flux within coil 17.
  • Figure 4 shows an enlarged perspective view of the inductor 7 from the electromagnetic generator 1 depicted in Figure 1.
  • the inductor magnets 20 to 23 can be semicircular shaped magnets.
  • the polarity of the magnetization of the inductor magnets 20 to 24 arranged side by side around the rod 15 is just the opposite.
  • the north pole of inductor magnet 20 is located at the upper side oriented towards the air gap between inductor magnets 20 and 22, whereas the north pole of inductor magnet 21 is located at the lower side of inductor magnet 21.
  • the orientation of the magnetization of inductor magnets 20 and 22 as well as 21 and 23, which are aligned above each other in the radial direction 29, is the same.
  • a magnetic circuit through the coil 17, through the front yoke part 18 and the rear yoke part 19 is formed resulting in a magnetic flux through the coil 17.
  • One disadvantage of the inductor 7 depicted in Figure 4 is that a current is only induced in the coil 17 if the oscillator 3 is moved in a direction 32, which is perpendicular to the separating slot 33 between the inductor magnets 20 to 23, i.e. in a direction parallel to the x-axis.
  • a second inductor 7 In order to generate electrical energy independent from the direction of the motion 4, a second inductor 7 must be provided, whose slot 33 is turned by 90 degrees. Both inductors 7 cannot be connected in series since due to the superposition principle this would be equivalent to an single inductor, whose magnetic field is restriced to opposing quadrats of the xy-plain, but whose magnetic field has two times the strength of the inductor magnets 20 to 23. Thus, the result would be, that a current is only induced if the direction of the motion 4 lies within these quadrants. Therefore it is necessary to provide each of the inductors with a separate rectifier, wherein the DC exits of same polarity may be interconnected.
  • Figure 5 shows a modified inductor 34, which creates a cur- rent in a coil 35 independent from the direction of the pivoting motion.
  • the inductor 34 is provided with a yoke 36 which comprises a stationary part 37 and a moveable part 38.
  • the stationary part 37 can be connected to the housing 2, whereas the moveable part 38 can be connected to the rear end of the rod 15, for instance to the cylindrical part 28.
  • the inductor 34 comprises a rotational symmetry around the symmetry axis S and is provided with a rod like central section 39 and a cylindrical outer section 40.
  • the coil 35 is disposed in an intermediate space between central section 39 and outer section 40.
  • the moveable part 38 is further provided with a permanent central inductor magnet 41 and an permanent outer inductor magnet 42.
  • the polarity of the magnetization of the central inductor magnet 41 and the outer inductor magnet 42 is oriented in opposite directions.
  • a magnetic circuit is formed through the central section 39 and the outer section 40 around the coil 35.
  • the stationary part 37 and the moveable part 38 are only separated by a small air gap 43 which is delimited by stationary pole pieces 44 of the stationary part 37 and moveable pole pieces 45 of the movable part 38.
  • Figure 6 shows a cross sectional view of a modified embodiment of the inductor 34.
  • the air gap 43 has the shape of a spherical segment in order to keep the distance between stationary part 37 and moveable part 38 constant during any displacement of the moveable part 38.
  • Figure 7 is the view from above on the stationary pole pieces 44 and moveable pole pieces 45 during a displacement of the moveable part 38.
  • the overlapping section of the stationary pole pieces 44 and the movable pole pieces 45 are reduced if the movable part 38 is diplaced from the rest position 6.
  • Figure 8 shows a cross sectional view of a further modified embodiment of the inductor 34.
  • stationary pole pieces 44 and the moveable pole pieces 45 are provided with a groove 46 along a circle around the symmetry axis S.
  • Figure 9 shows an view from above on the stationary pole piece 44 and the moveable pole piece 45 during a displacement of the moveable part 38.
  • Figure 10 depicts a further embodiment, in which the stationary pole pieces 44 and the moveable pole pieces 45 are provided with radial grooves 47, which have also the effect to reduce the overlapping area of the stationary pole pieces 44 and the moveable pole pieces 45 once the moveable part 38 is displaced from the rest position 6 as can be recognized from Figure 11, which illustrates the lack of overlapping during a displacement of the moveable part 38.
  • Figure 12 shows an embodiment, in which the stationary pole pieces 44 and the moveable pole pieces 45 are tapering towards the air gap 43, so that the overlapping area is also reduced during displacement of the moveable part 38 as can be recognized from Figure 13.
  • the outer inductor magnet has been omitted so that the magnetic flux through the yoke 36 is created by the central inductor magnet 41 only.
  • Figure 14 and Figure 15 show a further embodiment of the inductor 34, in which the pole pieces 44 and 45 are asymmetric with respect to a plane at right angle to the symmetry axis S.
  • a central movable pole piece 48 is provided with a central part 49 tapering towards the air gap 43.
  • the central part is surrounded by a ring-shaped protru- sion 50, so that the central movable pole piece 48 has the shape of a crown.
  • a central stationary pole piece 51 is located next to the central part 49 of the central movable pole piece 48, and an outer movable pole piece 52 is located next to an outer stationary pole piece 53.
  • the magnetic flux runs through the central part 49 of the movable pole piece 48 and the central stationary pole piece 51 as well through the outer movable pole piece 52 and the outer sta- tionary pole piece 53. If the movable part 38 is displaced from the rest position 6, the distance between the central part 49 of the central movable pole piece 48 and the central stationary pole piece 51 is increasing, whereas the distance between the protrusion 50 of the movable pole piece 48 and the outer stationary pole piece 53 is decreasing in the direction, in which the movable part 38 is displaced. Thus the magnetic flux is not only diminished by the displacement, but partially reversed.
  • Figure 14 and Figure 15 show a further embodiment of the inductor 34, in which the central part 49 is ring-shaped around a central recess 54. Also the central stationary pole piece 51 is ring-shaped around a central recess 55 for further enhancing the variation of the magnetic flux.
  • FIG. 18 shows an embodiment, in which the magnetization of the stator magnet 26 and the oscillator magnet has the same orientation and in which the oscillator magnet 27 is located within the ring-shaped stator magnet 26.
  • a pressing force or a drag force can be created similar to the arrangement depicted in Figures 2 and 3, since the oscillator magnet 27 will be pulled back in the neutral position depicted in Figure 18. If the oscillator magnet 27 is displaced from the rest position along the x-axis, the oscillator magnet is driven back to the rest position by a magnetic force acting in the tangential direction of the x- axis .
  • the protru- sion can also be located on the central stationary pole piece 51, if the central inductor magnet 41 is located in the stationary part 37.
  • Figure 19 shows a modified embodiment of the connection between oscillator 3 and housing 2.
  • the oscillator 3 and the housing are connected by a thread 56, on which the oscillator 3 is pulling.
  • Figure 20 shows a further embodiment, in which the conical part 12 is provided with a hook 57, which engages another hook 58, which is attached to the housing 2.
  • Hook 57 is further provided with a pin 59, which contacts hook 58. If the oscillator 3 is pulled away from hook 58, pin 59 presses against the inside of hook 58 and allows the oscillator to pivot around a contact point 60 between pin 59 and hook 58.
  • the electromagnetic generator 1 described herein is particularly suitable for sensor arrangements which cannot be connected to a power line and must be provided with their own energy source. Such a sensor arrangement can also be provided with a transmission unit for wireless transmission of the sensor data to a processing unit, which further processes the sensor data.
  • the electromagnetic generator 1 may be particular suitable for sensors, which are located in the driving rod for a flap within the wing of an airplane.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

La présente invention a trait à un générateur électromagnétique (1) comprenant un oscillateur magnétique (3) et un stator magnétique (5), ainsi qu'un mode d'armement (17) dans lequel un courant est induit par le mouvement de l'oscillateur magnétique (3). L'oscillateur magnétique (3) dispose de deux degrés de liberté pour son mouvement de pivotement (4).
PCT/EP2011/051093 2010-01-26 2011-01-26 Générateur électromagnétique Ceased WO2011092223A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010005712.6 2010-01-26
DE102010005712 2010-01-26

Publications (2)

Publication Number Publication Date
WO2011092223A2 true WO2011092223A2 (fr) 2011-08-04
WO2011092223A3 WO2011092223A3 (fr) 2012-09-13

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PCT/EP2011/051093 Ceased WO2011092223A2 (fr) 2010-01-26 2011-01-26 Générateur électromagnétique

Country Status (1)

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WO (1) WO2011092223A2 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008138278A2 (fr) 2007-05-09 2008-11-20 Vysoke Uceni Technicke V Brne Générateur de vibrations électromagnétiques pour basses fréquences vibrationnelles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007144873A2 (fr) * 2006-06-12 2007-12-21 Uri Rapoport Dispositif électromagnétique de génération de courant électrique et procédés associés

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008138278A2 (fr) 2007-05-09 2008-11-20 Vysoke Uceni Technicke V Brne Générateur de vibrations électromagnétiques pour basses fréquences vibrationnelles

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WO2011092223A3 (fr) 2012-09-13

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