EP3918618A1 - Bobine electrique a faible rayonnement acoustique - Google Patents
Bobine electrique a faible rayonnement acoustiqueInfo
- Publication number
- EP3918618A1 EP3918618A1 EP20704786.1A EP20704786A EP3918618A1 EP 3918618 A1 EP3918618 A1 EP 3918618A1 EP 20704786 A EP20704786 A EP 20704786A EP 3918618 A1 EP3918618 A1 EP 3918618A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electric coil
- turns
- coil
- equal
- opening
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/02—Coils wound on non-magnetic supports, e.g. formers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/02—Coils wound on non-magnetic supports, e.g. formers
- H01F2005/022—Coils wound on non-magnetic supports, e.g. formers wound on formers with several winding chambers separated by flanges, e.g. for high voltage applications
Definitions
- TITLE Electric coil with low acoustic radiation.
- the present invention relates to an electric coil. It also relates to a system comprising such a coil and a method of using such a coil.
- the coils used to regulate the current in the electricity distribution or transmission network are subjected to electromagnetic forces resulting from the alternating current which feed them. These stresses cause vibrations and acoustic radiation that can create noise pollution.
- the aim of the present invention is to reduce the noise nuisance from electric coils, preferably by reducing the need for cooling and / or without necessarily being limited to low frequencies.
- an electric coil comprising a wire of electrically conductive material wound in several turns around a main axis located inside the coil, each turn making a complete turn around the main axis, the different turns succeeding each other in a manner offset parallel to the main axis, characterized in that it comprises openings between pairs of turns following one another in the direction of the main axis.
- the coil can comprise, on at least part or on the whole of the coil, at least one opening between each pair of turns following one another in the direction of the main axis.
- the coil may comprise, on at least part or on the whole of the coil, at least one opening between groups of turns. succeeding in the direction of the main axis. Each group preferably comprises the same number of turns.
- At least one or each opening separating two turns may include a hole through a material separating these two turns.
- the coil may include, as openings, several perforations or slits passing through the material separating the turns distributed over the entire turn of these turns around the main axis, these perforations or slots preferably being spaced apart at most 2 mm along the turns. .
- At least one or each opening separating two turns may include a space along these two turns all around the turns of these turns around the main axis.
- the smallest dimension of each opening is preferably at least 0.1mm.
- the openings are preferably arranged for an opening rate of the coil:
- the openings are preferably distributed evenly over the coil.
- a system comprising a coil according to the invention and an electrical source arranged to supply the coil electrically with an electrical signal generating, continuously or occasionally, a vibration of the coil at the frequency f.
- the smallest dimension of each opening is preferably at least equal to
- the frequency of vibration of the coil is preferably between 20 Hz and 20 kHz.
- the electrical signal preferably has an intensity of at least 100 A.
- a method of using a coil according to the invention in which the coil is supplied electrically, by an electrical source, with an electrical signal generating, continuously or punctual, a vibration of the coil at the frequency f.
- the smallest dimension of each opening is preferably at least equal to the viscosity of the air at 18 ° C and
- the frequency of vibration of the coil is preferably between 20 Hz and 20 kHz.
- the electrical signal preferably has an intensity of at least 100 A.
- Figure 1 is a schematic side view of a first embodiment 101 of the coil according to the invention
- Figure 2 is a schematic profile view of a second embodiment
- Figure 3 is a schematic side view of a third embodiment
- Figure 4 is a schematic side view of a fourth embodiment
- FIG. 5 illustrates different curves of sound pressure levels generated by different variants of coils according to the invention.
- variants of the invention comprising only a selection of characteristics described or illustrated below isolated from the other characteristics described or illustrated (even if this selection is isolated within a sentence comprising these other characteristics), if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art.
- This selection comprises at least one preferably functional characteristic without structural details, and / or with only part of the structural details if this part alone is sufficient to confer a technical advantage or to differentiate the invention from the state of the art. earlier.
- FIG. 1 a first embodiment 101 of the coil according to the invention.
- the electric coil 101 comprises a wire of electrically conductive material wound in several turns 2 around a main axis 1 located inside the coil 101 and extending in one direction.
- Coil 101 is a single-layer or multi-layer industrial coil.
- the layers can be contiguous (in this case, there is a single cylinder if the coil has a cylindrical shape) or disjoint (in this case we have, if the coil has a cylindrical shape, several concentric cylinders separated by an air gap).
- the coil 101 preferably has a cylindrical shape, but may have various shapes depending on the variant considered, for example a coil 101 of rectangular section.
- Each turn 2 makes a complete revolution around the main axis 1.
- the different turns 2 follow one another in an offset manner parallel to the main axis 1.
- all of the turns 2 progressively form a shape surrounding and running along axis 1, such as for example a tube.
- These different turns 2 can optionally include, locally, several turns 2 contained in the same plane perpendicular to the axis 1.
- the coil 101 comprises openings 3 between pairs of turns 2a, 2b succeeding each other in the direction of the main axis 1.
- the coil 101 comprises, on at least part or on the whole of the coil 101, at least one opening 3 between each pair of turns 2a, 2b succeeding each other in the direction of the main axis 1.
- Each opening 3 is arranged to allow free passage of gas (typically air) through it between the outside of the coil 101 and the inside (i.e. the axis 1) of the coil 101.
- gas typically air
- This passage of gas (typically air) from the outside of coil 101 to axis 1 makes it possible to reduce the acoustic radiation from coil 101.
- gas typically air
- the interior of the coil 101 is defined as being the space between the turns 2 and the axis 1.
- the exterior of the coil 101 is defined as being the space included beyond the turns 2 with respect to the axis 1.
- this support or frame is also perforated so as not to obstruct the openings 3, so that for each opening 3 a straight line of free path of gas (such as air) can connect axis 1 to the outside of the coil 101 and to the outside of the support or frame.
- a straight line of free path of gas such as air
- Each turn 2 preferably has a height (measured parallel to axis 1) less than 20 cm for the low frequencies of the human audible range or less than 20 mm or less than 2 mm for the high frequencies of the human audible range ( 20 kHz or less).
- Each opening 3 preferably has a height (measured parallel to axis 1) less than the height of a turn 2 (measured parallel to axis 1).
- Each turn 2 preferably has a thickness (measured perpendicular to axis 1) less than or equal to twice the height of each opening 3 (measured parallel to axis 1).
- the coil 101 preferably has a height (measured parallel to axis 1) greater than ten times the height of a turn (measured parallel to axis 1).
- the coil 101 preferably has an external diameter or more generally (especially in the case of turns 2 making turns of square or oval shape, etc.) at least one external width of the turns 2 (measured in a plane perpendicular to the axis 1) greater than 40 cm.
- Each opening 3 follows the inclination of the turns 2.
- At least one or each opening 3 separating two turns 2a, 2b comprises a space along these two turns 2a, 2b all around these turns 2a, 2b around the main axis 1.
- each opening 3 is at least 0.1mm, preferably at least 0.5mm, preferably at least 1mm. This smallest dimension is, in this embodiment, the height of each opening 3 measured parallel to the axis 1.
- each opening 3 is less than 5 mm.
- the openings 3 are arranged for an opening rate of the coil greater than or equal to 0.5% (or even greater than or equal to 1%).
- the openings 3 are arranged for an opening rate of the coil
- the openings 3 are evenly distributed on the coil
- the openings 3 are arranged on the coil 101 with a constant spatial periodicity parallel to the axis 1 and / or along the turns 2.
- the openings 3 are distributed or arranged with a constant spatial periodicity parallel to the axis 1.
- the turns 2 are made of aluminum with a section of rectangular shape and dimensions 25mm by 20mm composed of 36 strands of diameter 4mm, and each turn 2 having the shape of a circle, for a total of 18 turns,
- the coil 101 forms a cylinder with a height of 394 mm measured parallel to axis 1 and with an internal diameter of 550 mm measured in a plane perpendicular to axis 1 and with an external diameter of 600 mm measured in a plane perpendicular to the axis 1, axis 1 being the axis of revolution of this cylinder,
- the openings or slits 3 have a height of 2 mm measured parallel to the axis 1
- a second embodiment 102 of the coil according to the invention will now be described with reference to FIG. 2.
- Coil 102 will only be described for its differences from coil 101.
- the coil 102 comprises, on at least part or on the whole of the coil 102, at least one opening 3 between groups 22 of turns 2 following one another along the main axis 1.
- Each group 22 comprises the same number of turns 2, typically greater than or equal to 2 and / or less than or equal to 10.
- the openings 3 are always arranged for an opening rate of the coil 102 greater than or equal to 0.5% (or even greater than or equal to 1%).
- the turns 2 are made of aluminum with a section of rectangular shape and dimensions 25mm by 20mm composed of 36 strands of diameter 4 mm, and each turn 2 having the shape of a circle, for a total of 18 turns,
- the coil 102 forms a cylinder of height 384 mm measured parallel to axis 1 and of internal diameter of 550 mm measured in a plane perpendicular to axis 1 and of external diameter of 600 mm measured in a plane perpendicular to the axis 1, axis 1 being the axis of revolution of this cylinder,
- the openings or slots 3 have a height of 3 mm measured parallel to the axis 1
- each group 22 comprises 2 turns.
- a third embodiment 103 of the coil according to the invention will now be described with reference to FIG. 3. The coil 103 will only be described for its differences from the coil 101 or 102.
- At least one or each opening 3 separating two turns 2a, 2b comprises a hole passing through a material separating these two turns 2a, 2b.
- the openings 3 comprise for each pair of neighboring turns 2a, 2b considered, several perforations or slots passing through the material (for example polymer of ABS (acrylonitrile butadiene styrene) type) separating the turns 2a, 2b.
- material for example polymer of ABS (acrylonitrile butadiene styrene) type
- These holes 3 are preferably spaced apart by a distance 4
- the acoustic wavelength determined at the frequency of the vibration f preferably less than or equal to 20 cm (to cover low acoustic frequencies), preferably less than or equal to 2 cm (to cover the intermediate frequencies), preferably less than or equal to 2 mm (to cover the high acoustic frequencies).
- each opening 3 is at least 0.1mm, preferably at least 0.5mm, preferably at least 1mm. This smallest dimension is, in this embodiment, the height of each hole 3 measured parallel to the axis 1 or the length of each hole (slot or perforation) measured along the two turns 2a, 2b that this opening 3 separates .
- the openings 3 are always arranged for an opening rate of the coil 103 greater than or equal to 0.5%, preferably greater than or equal to 1%.
- the openings 3 are distributed or arranged on the coil 103 with a preferably constant spatial periodicity along the turns 2, ie along the direction of the inclination of the turns 2.
- the openings 3 are distributed or arranged on the coil 103 with a first constant spatial periodicity in the direction of axis 1 and a second constant spatial periodicity along the turns 2.
- the example coil embodiment 103 differs from the example coil embodiment 101 or 102 in that each opening 3 is a hole in the form of an elongated slot having:
- a fourth embodiment 104 of the coil according to the invention will now be described with reference to FIG. 4. Coil 104 will only be described for its differences from coil 103.
- each opening 3 is a perforation-shaped hole of comparable height and length, i.e. having:
- the invention consists in perforating the coil 101, 102, 103 or 104 (with turns 2 partially (figure 2) or totally (figure 1) not contiguous) so as to reduce the mechanical-acoustic conversion of the vibrations, towards the creation of a sound wave.
- the presence of spaces (air or more generally gas) between the turns 2 creates an acoustic short-circuit, which greatly reduces the acoustic radiation efficiency of the coil 101, 102, 103 or 104.
- the invention makes it possible to reduce the acoustic radiation of the coils present in the electricity distribution or transmission networks while substantially retaining the value of the inductance of the coil. This is the application of a vibroacoustic concept to an industrial system.
- the invention makes it possible to avoid effective acoustic radiation of a structure by virtue of its perforated or perforated nature.
- the electrical source is for example a current generator of an electricity distributor, arranged to generate an electrical supply signal typically with a fundamental frequency greater than 10Hz or even 40Hz and / or less than 1000 Hz or even 100 Hz (typically equal to 50Hz or 60Hz) and a current greater than 100 A or even greater than 1000 A.
- the electrical source is arranged to supply the coil 101, 102, 103 or 104 electrically with the electrical supply signal generating, continuously or punctually, a vibration of the coil at the frequency f typically equal to twice the fundamental frequency of the coil. power supply electrical signal.
- Other vibrations of the coil are possible, in particular at harmonics of higher frequencies or combinations of harmonics.
- each opening 3 is at least equal to the thickness of viscous skin the viscosity of the air at 18 ° C and
- the smallest dimension (typically the height, measured parallel to axis 1) of the spacings 3 must be greater than the viscous skin thickness, namely:
- these holes or perforations 3 are preferably spaced from each other by a distance 4 (measured along a line equidistant curve of each of the two turns 2 that these holes or perforations 3 separate) less than the acoustic wavelength at the frequency of the vibration f, namely:
- the vibration frequency f of the coil is between 20 Hz and 20 kHz.
- the electrical supply signal has an intensity of at least 100 A.
- the coil 101, 102, 103 or 104 is supplied electrically, by the electric source, with the electric power supply signal generating, continuously or occasionally, the vibration of the coil at the frequency f.
- each opening 3 is at least equal to
- the vibration frequency f of the coil is between 20 Hz and 20 kHz.
- the electrical supply signal has an intensity of at least 100 A.
- FIG. 5 illustrates different curves of sound pressure levels generated by different variants of coils according to the invention, according to the second embodiment 102 according to the invention, with the following parameters:
- the turns 2 are made of copper with a section of rectangular shape and dimensions 0.5 mm by 1 mm composed of 2 strands of diameter 0.5 mm, and each turn 2 having the shape of a circle, for a total of 18 turns ,
- the coil 102 forms a cylinder of height 90 mm measured parallel to axis 1 and of internal diameter of 138 mm measured in a plane perpendicular to axis 1 and of external diameter of 140 mm measured in a plane perpendicular to the axis 1
- the openings or slits 3 have a height, measured parallel to axis 1, of:
- each group 22 comprises 2 turns, i.e. nine groups 22 of two turns 2.
- FIG. 5 compares the sound pressure level generated at 10 m by the non-perforated coil (curve 10) with that generated by the perforated coils 102 (curves 11 to 13). It is noted that there is a very significant decrease in the noise level at all frequencies when the coil 102 is perforated. For a 2% perforated coil, the level of mode (2.0) decreases by approximately 20 dB while that of mode (0.0) decreases by almost 29 dB. Between the two, it should be noted that there are modes that are more attenuated than others. Thus the level of mode (4.0) is attenuated by 15 dB while the level of mode (5.0) decreases by more than 36 dB. It is also interesting to note that the change in noise reduction is quite low between a perforated coil at 2% and another at 4 or 9%.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Coils Of Transformers For General Uses (AREA)
- Windings For Motors And Generators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1900965A FR3092433B1 (fr) | 2019-01-31 | 2019-01-31 | Bobine électrique à faible rayonnement acoustique |
| PCT/EP2020/052069 WO2020157081A1 (fr) | 2019-01-31 | 2020-01-28 | Bobine electrique a faible rayonnement acoustique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3918618A1 true EP3918618A1 (fr) | 2021-12-08 |
Family
ID=67262500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20704786.1A Withdrawn EP3918618A1 (fr) | 2019-01-31 | 2020-01-28 | Bobine electrique a faible rayonnement acoustique |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20220076878A1 (fr) |
| EP (1) | EP3918618A1 (fr) |
| CN (1) | CN113678213A (fr) |
| BR (1) | BR112021015100A2 (fr) |
| CA (1) | CA3126874A1 (fr) |
| FR (1) | FR3092433B1 (fr) |
| WO (1) | WO2020157081A1 (fr) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170271065A1 (en) * | 2013-07-17 | 2017-09-21 | Rohde & Schwarz Gmbh & Co. Kg | Coil for a switching device with a high-frequency power |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090251257A1 (en) * | 2008-04-03 | 2009-10-08 | Gerald Stelzer | Wiring Assembly And Method of Forming A Channel In A Wiring Assembly For Receiving Conductor and Providing Separate Regions of Conductor Contact With The Channel |
| WO2012098851A1 (fr) * | 2011-01-18 | 2012-07-26 | Yazaki Corporation | Dispositif de retenue de bobines de résonance, bloc de bobines de résonance, et appareil de transmission de puissance électrique de type sans contact |
| CN102637502B (zh) * | 2012-03-06 | 2014-03-19 | 中国科学院电工研究所 | 一种桶式高温超导无感线圈 |
| JP6417713B2 (ja) * | 2014-05-22 | 2018-11-07 | 株式会社Ihi | コイル装置 |
| CA2982348C (fr) * | 2015-03-05 | 2024-07-02 | Enhanced Life Water Solutions, LLC | Systemes et procedes de commande de champs electriques dans un fluide, dans des gaz et des bacteries |
| EP3366910A1 (fr) * | 2017-02-24 | 2018-08-29 | Jean Marc Allemeersch | Dispositif pour la reduction de la consommation en carburant d'un moteur |
-
2019
- 2019-01-31 FR FR1900965A patent/FR3092433B1/fr not_active Expired - Fee Related
-
2020
- 2020-01-28 US US17/423,405 patent/US20220076878A1/en not_active Abandoned
- 2020-01-28 EP EP20704786.1A patent/EP3918618A1/fr not_active Withdrawn
- 2020-01-28 CN CN202080011860.9A patent/CN113678213A/zh active Pending
- 2020-01-28 CA CA3126874A patent/CA3126874A1/fr active Pending
- 2020-01-28 BR BR112021015100-1A patent/BR112021015100A2/pt not_active Application Discontinuation
- 2020-01-28 WO PCT/EP2020/052069 patent/WO2020157081A1/fr not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170271065A1 (en) * | 2013-07-17 | 2017-09-21 | Rohde & Schwarz Gmbh & Co. Kg | Coil for a switching device with a high-frequency power |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3092433A1 (fr) | 2020-08-07 |
| CN113678213A (zh) | 2021-11-19 |
| WO2020157081A1 (fr) | 2020-08-06 |
| US20220076878A1 (en) | 2022-03-10 |
| BR112021015100A2 (pt) | 2021-10-05 |
| CA3126874A1 (fr) | 2020-08-06 |
| FR3092433B1 (fr) | 2021-05-21 |
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