Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
  • H04R9/06—Loudspeakers
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
  • H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
  • H04R9/02—Details
  • H04R9/025—Magnetic circuit
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
  • H04R2209/043—Short circuited voice coils driven by induction

Definitions

• the present invention relates to inductive motor devices comprising at least one fixed coil, a moving armature, and magnets.
• a device can form, for example, an inductive loudspeaker.
• the present invention relates to the means of setting the membrane of an inductive loudspeaker in motion.
• Loudspeaker membranes working in low and medium frequencies are generally set in motion by an actuator or motor.
• loudspeaker actuators There are mainly two types of loudspeaker actuators, the most widely used actuators, with a voice coil connected to the diaphragm, called “voicecoil” and induction actuators, with coil and fixed magnets, and moving armature attached to the diaphragm. membrane.
• voicecoil voice coil connected to the diaphragm
• induction actuators with coil and fixed magnets, and moving armature attached to the diaphragm. membrane.
• none of these inventions adapted this axial magnetic flux system to an inductive system.
• the magnets are placed radially inside or outside a magnetic air space where the armature moves. Arranged in this way, the magnets create a single magnetic field present around the entire circumference of the actuator. Since the magnetic field is generated by the magnets, good magnet quality is preferable. However, the more strongly magnetic the magnet, the lower its Curie temperature, that is, the temperature at which it demagnetizes. However, the temperature in the heart of a loudspeaker tends to rise rapidly.
• the magnetic field coupled with a variable electric field creates a force in the armature, thus setting it in motion, just like the membrane.
• the object of the present invention is to improve known systems, in particular, but not exclusively, loudspeakers.
• the present invention overcomes the aforementioned drawbacks associated with the magnetic field and proposes to produce an induction system with double axial magnetic flux.
• the device such as a loudspeaker, as defined in the preamble, is characterized in particular in that it has a motor comprising two sources of magnetic fields, placed axially on either side of a central core.
• These sources of magnetic fields can be ring-shaped permanent magnets, or other forms of permanent bipolar magnets such as discs or ring portions. Their poles are axially aligned with the core, but their polarities are opposite.
• the magnetic fields generated by these magnets are guided by the central core on the one hand and, on the other hand, by one or more parts having good magnetic conductivity and coming to complete the magnetic circuit.
• each magnet By being positioned in this way, each magnet will create its own magnetic field. In this way, the total magnetic field generated in the loudspeaker is doubled at the level of the armature compared to an induction loudspeaker. classic. This double magnetic field increases the force generated on the armature, and thus improves the sensitivity of the loudspeaker.
• the present invention relates to an inductive motor device comprising a fixed coil, an armature movable in a magnetic air space, a central core, and it comprises at least two magnetic sources arranged axially on both sides. other from the central core.
• the magnetic sources are opposed, thus creating two separate magnetic fields.
• At least one of the magnetic sources comprises one or more annular bipolar permanent magnets.
• At least one of the magnetic sources comprises one or more bipolar permanent magnets in the form of a disk.
• At least one of the magnetic sources comprises one or more bipolar permanent magnets in the form of ring portions.
• the loudspeaker comprises at least one device as described in the present application.
• the loudspeaker comprises at least one membrane linked to the armature and set in motion by the armature.
• the loudspeaker comprises a bowl to which the membrane is attached and a casing fixing the inductive motor device to the bowl.
• the invention relates to a method for moving an object by means of an inductive motor device as described in the present application.
• the object moved by the inductive motor device is a membrane, for example the membrane of a loudspeaker.
• Figure 1 shows a sectional and perspective view of the loudspeaker motor comprising the induction system with double axial magnetic flux according to one embodiment of the invention
• Figure 2 shows a sectional view of the loudspeaker comprising the motor with the induction system with double axial magnetic flux according to an embodiment of the invention
• FIG. 3 represents a sectional and perspective view of the loudspeaker comprising the motor with the induction system with double axial magnetic flux according to one embodiment of the invention
• FIG. 4 represents an exploded view of the loudspeaker, showing all of the components of the motor and of the loudspeaker according to one embodiment of the invention
• Figure 5 shows a sectional view of the motor with induction system with axial magnetic double flux, and a representation of the magnetic fields modeled by arrows according to an embodiment of the invention
• Figure 6a shows a ring-shaped magnet according to one embodiment of the invention
• Figure 6b shows a magnet in the form of ring portions according to one embodiment of the invention
• Figure 6c shows a disk-shaped magnet according to one embodiment of the invention
• Figure 7a shows a sectional and perspective view of the loudspeaker comprising the inductive motor composed of annular magnets according to an embodiment of the invention
• Figure 7b shows a sectional and perspective view of the loudspeaker comprising the inductive motor composed of magnets in ring portions according to an embodiment of the invention
• Figure 7c shows a sectional and perspective view of the loudspeaker comprising the inductive motor composed of disc-shaped magnets according to an embodiment of the invention.
• the inductive motor 10 of the loudspeaker 20 comprises a core 2, a bowl 3b and a lower casing 3a all three formed of a magnetically conductive material, preferably steel or another equivalent material; a fixed coil 5 mounted inside said bowl 3b and supplied with an alternating current; two permanent magnets 1a, 1b, formed of a strongly magnetic material, preferably neodymium, an upper magnet 1a having a north face 11a and a south face 11b, and a lower magnet 1b having a north face 12a and a south face 12b .
• Said inductive motor 10 can be equipped with different forms of magnets, such as ring magnets 1a and 1b shown in Figures 6a and 7a, magnets in the form of ring portions such as the upper magnets in the form of ring portions 1c and the lower magnets in the form of ring portions 1d shown in Figures 6b and 7b, or disc-shaped magnets such as the upper disc-shaped magnet 1 e and the lower disc-shaped magnet 1f shown in Figures 6c and 7c.
• magnets such as ring magnets 1a and 1b shown in Figures 6a and 7a
• magnets in the form of ring portions such as the upper magnets in the form of ring portions 1c and the lower magnets in the form of ring portions 1d shown in Figures 6b and 7b
• disc-shaped magnets such as the upper disc-shaped magnet 1 e and the lower disc-shaped magnet 1f shown in Figures 6c and 7c.
• Said magnets are mounted so as to have their said north faces, 11a and 12a respectively in contact with said core 2, said south face of upper magnet 11b in contact with said bowl 3b and said south face of lower magnet 12b in contact with said lower casing 3a, so as to form between said core 2, said upper magnet 1a, said lower magnet 1b, said bowl 3b, said lower casing 3a and said fixed coil 5, a magnetic air space 6.
• an armature 4 made of a conductive material, preferably aluminum, and connected to a membrane 7 of the loudspeaker.
• the fastening system for connecting the membrane 7 to the armature 4 may for example comprise tabs 21 of the armature 4 which are fixed to the pads 22 of the membrane.
• the assembly of said loudspeaker 20 illustrated in FIG. 2 comprises said inductive motor 10, said membrane 7 fixed to the bowl 8a, and a loudspeaker casing 8b which fixes said motor 10 with said bowl 8a.
• Said magnets 1 a and 1 b can also be mounted in opposite ways, with said south faces 11b and 12b respectively in contact with said core 2, without the operating principle of said inductive motor 10 being altered, in an equivalent construction.
• Said annular magnets 1a and 1b can be replaced by magnets in the form of ring portions 1c and 1d or in the form of a disc 1e and 1f as illustrated in the present application.
• said upper magnets 1a and lower 1b are positioned so that their poles in contact with said core 2 are the same.
• Said upper and lower magnets 1a and 1b create two distinct magnetic fields: an upper magnetic field 9a and a lower magnetic field 9b.
• Said upper magnetic field 9a generated by said upper magnet 1a first passes through said core 2, then said magnetic air space 6 from the inside to the outside to interact with said armature 4. It then returns to said south face. 11b of said upper magnet 1a through said fixed coil 5 and said bowl 3b.
• Said lower magnetic field 9b, generated by said lower magnet 1b first passes through said core 2, then said magnetic air space 6, from the inside to the outside.
• said magnetic fields 9a and 9b have the same direction and the same direction, which represents a magnetic intensity doubled compared to a conventional induction system with a single and radial magnetic flux.
• Said magnetic fields 9a and 9b coupled to the electric field generated by said fixed coil 5, create a force in said armature 4. This force sets in motion said armature 4, linked to said membrane 7 for example by means 21, 22 described below. -above.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Signal Processing (AREA)
• Power Engineering (AREA)
• Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=78022991

Family Applications (1)

Country Status (3)

Family Cites Families (34)

• 2021
  • 2021-04-01 US US17/918,078 patent/US20230164492A1/en active Pending
  • 2021-04-01 EP EP21724030.8A patent/EP4133750A1/de active Pending
  • 2021-04-01 WO PCT/IB2021/052737 patent/WO2021205295A1/fr unknown

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