CN110022518B - Low-eddy-current magnetic-loss armature device for electroacoustic transducer - Google Patents
Low-eddy-current magnetic-loss armature device for electroacoustic transducer Download PDFInfo
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- CN110022518B CN110022518B CN201910344569.2A CN201910344569A CN110022518B CN 110022518 B CN110022518 B CN 110022518B CN 201910344569 A CN201910344569 A CN 201910344569A CN 110022518 B CN110022518 B CN 110022518B
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- magnet
- sheet
- magnetic
- yoke
- vibrating piece
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- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 230000035699 permeability Effects 0.000 claims 2
- 230000035945 sensitivity Effects 0.000 abstract 1
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 12
- 235000014676 Phragmites communis Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- H04R9/02—Details
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
The invention discloses a low eddy current magnetic loss armature device for electroacoustic transducer, comprising: a yoke, a coil, a vibrating piece, a mechanical guide rod, a first magnet and a second magnet; a first magnet and a second magnet are arranged in parallel in the magnetic yoke, and the first magnet and the second magnet are aligned up and down; an air gap is formed between the first magnet and the second magnet; a coil is arranged on one side surface of the magnetic yoke; the vibrating piece is U-shaped, one short side of the vibrating piece is fixed on the outer surface of the magnetic yoke, the other long side of the vibrating piece passes through the hollow position in the middle of the coil and extends into the magnetic yoke all the time and passes through an air gap between the first magnet and the second magnet; the mechanical guide is provided on the surface of the longer side of the vibrating piece. The invention eliminates the stiffness of the acoustic cavity, and can greatly improve the low-frequency sensitivity of the electroacoustic transducer.
Description
Technical Field
The invention relates to the technical field of electroacoustic transducers, in particular to a low-eddy-current magnetic loss armature device for an electroacoustic transducer.
Background
The traditional receiver armature is cast by a whole iron-nickel alloy, and has high cost and low yield. And the magnetic resistance is small due to the large cross section. Under the action of an alternating electromagnetic field when the receiver works, magnetic flux passes through the low-resistance section, eddy currents can be formed in parts, the carrying capacity of the magnetic yoke on magnetic field energy is reduced, and the receiver performance is reduced due to eddy current loss.
Disclosure of Invention
The invention aims to provide a low eddy current magnetic loss armature device for an electroacoustic transducer.
To achieve the above object, the present invention adopts the following:
a low eddy current magnetic loss armature assembly for an electroacoustic transducer comprising: a yoke, a coil, a vibrating piece, a mechanical guide rod, a first magnet and a second magnet; a first magnet and a second magnet are arranged in parallel in the magnetic yoke, and the first magnet and the second magnet are aligned up and down; an air gap is formed between the first magnet and the second magnet; a coil is arranged on one side surface of the magnetic yoke; the vibrating piece is U-shaped, one short side of the vibrating piece is fixed on the outer surface of the magnetic yoke, the other long side of the vibrating piece passes through the hollow position in the middle of the coil and extends into the magnetic yoke all the time and passes through an air gap between the first magnet and the second magnet; the mechanical guide is provided on the surface of the longer side of the vibrating piece.
Preferably, the magnetic yoke comprises a loop-shaped magnetic conductive sheet, a first positioning sheet, a second positioning sheet, a first impact protection sheet and a second impact protection sheet; lugs are arranged at the center positions of the two sides of the first positioning sheet and the second positioning sheet; the upper and lower side centers of the first impact protection sheet and the second impact protection sheet are respectively provided with a bump; the positions of the return-type magnetic conduction sheet, the first positioning sheet, the second positioning sheet, the first impact protection sheet and the second impact protection sheet are sequentially arranged from left to right; the mechanical guide rod is arranged at the end point of the longer side of the vibrating piece.
Preferably, the magnetic yoke comprises a magnetic conductive sheet, a first positioning sheet, a second positioning sheet, a first opening magnetic conductive sheet and a second opening magnetic conductive sheet; lugs are arranged at the center positions of the two sides of the first positioning sheet and the second positioning sheet; notches are formed in the middle of the upper ends of the first opening magnetic conduction sheet and the second opening magnetic conduction sheet; the positions of the return-type magnetic conductive sheet, the first positioning sheet, the second positioning sheet, the first opening magnetic conductive sheet and the second opening magnetic conductive sheet are sequentially arranged from left to right; the mechanical guide rod is arranged in the middle of the vibrating piece and penetrates through the notch.
Preferably, the upper surface of the first magnet is attached to the inner upper surface of the yoke; the lower surface of the second magnet is attached to the inner lower surface of the magnetic yoke.
Preferably, the yoke is made of a high magnetic conductive alloy.
Preferably, the loop-shaped magnetic conductive sheet, the first positioning sheet, the second positioning sheet, the first impact protection sheet and the second impact protection sheet are connected together through riveting.
Preferably, the magnetic conductive sheet, the first positioning sheet, the second positioning sheet, the first opening magnetic conductive sheet and the second opening magnetic conductive sheet are connected together through riveting.
The invention has the following advantages:
the laminated riveting magnetic yoke design provided by the invention has the advantages of low cost and high yield, and can greatly reduce eddy current loss; the laminated magnetic conductive loop is designed into a magnetic conductor with a narrow section and a long loop, and when magnetic flux passes through the narrow section, the magnetic resistance of the component is large, so that the eddy current is greatly weakened.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Fig. 1 is a schematic diagram of a first case structure of a low eddy current magnetic loss armature apparatus for an electroacoustic transducer of the present invention.
Fig. 2 is a cross-sectional view showing a first case structure of a low eddy current magnetic loss armature apparatus for an electroacoustic transducer of the present invention.
Fig. 3 is a schematic view of a yoke structure according to a first aspect of the present invention.
Fig. 4 is an exploded view of a yoke according to a first aspect of the present invention.
Fig. 5 is a schematic diagram of a first case structure of a low eddy current magnetic loss armature apparatus for an electroacoustic transducer of the present invention.
Fig. 6 is a cross-sectional view showing a first case structure of a low eddy current magnetic loss armature apparatus for an electroacoustic transducer of the present invention.
Fig. 7 is a schematic view of a yoke structure according to a first aspect of the present invention.
Fig. 8 is an exploded view of a yoke according to a first aspect of the present invention.
In the drawings, each reference numeral is:
1-magnetic yoke, 2-coil, 3-vibrating piece, 4-mechanical guide rod, 5-first magnet, 6-second magnet, 11-return magnetic conductive sheet, 12-magnetic conductive sheet, 13-first positioning sheet, 14-second positioning sheet, 15-first impact protection sheet, 16-second impact protection sheet, 17-first opening magnetic conductive sheet, 18-second opening magnetic conductive sheet, 19-bump, 20-lug and 21-notch.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
Example 1:
as shown in fig. 1 to 4, a low eddy current magnetic loss armature apparatus for an electroacoustic transducer includes: a yoke 1, a coil 2, a vibrating piece 3, a mechanical guide rod 4, a first magnet 5 and a second magnet 6; a first magnet 5 and a second magnet 6 are arranged in parallel in the magnetic yoke 1, and the first magnet 5 and the second magnet 6 are aligned up and down; an air gap is formed between the first magnet 5 and the second magnet 6; a coil is arranged on one side surface of the magnetic yoke 1; the vibrating piece 3 is U-shaped, one short side of the vibrating piece 3 is fixed on the outer surface of the magnetic yoke 1, and the other long side of the vibrating piece passes through the hollow position in the middle of the coil and extends into the magnetic yoke 1 all the way to pass through an air gap between the first magnet 5 and the second magnet 6; the mechanical guide 4 is provided on the surface of the longer side of the vibrating piece 3.
Further, the magnetic yoke 1 comprises a magnetic conductive sheet 11, a magnetic conductive sheet 12, a first positioning sheet 13, a second positioning sheet 14, a first impact protection sheet 15 and a second impact protection sheet 16; lugs 20 are arranged at the center positions of the two sides of the first positioning sheet 13 and the second positioning sheet 14; the upper and lower side centers of the inside of the first impact protection sheet 15 and the second impact protection sheet 16 are respectively provided with a bump 19; the positions of the return-type magnetic conductive sheet 11, the magnetic conductive sheet 12, the first positioning sheet 13, the second positioning sheet 14, the first impact protection sheet 15 and the second impact protection sheet 16 are sequentially arranged from left to right; the mechanical guide 4 is provided at the end position of the longer side of the vibrating piece 3.
Further, the upper surface of the first magnet 5 is attached to the inner upper surface of the yoke 1; the lower surface of the second magnet 6 is bonded to the inner lower surface of the yoke 1.
Further, the yoke 1 is made of a high magnetic conductive alloy.
Further, the magnetic conductive sheet 11, the magnetic conductive sheet 12, the first positioning sheet 13, the second positioning sheet 14, the first impact protection sheet 15 and the second impact protection sheet 16 are connected together through riveting.
When the vibration piece 3 receives short-time impact force in use, the first impact protection piece 15 and the second impact protection piece 16 are provided with the convex blocks 19 which limit the vibration piece 3 to further move and deform, so that the vibration piece 3 still maintains elastic deformation; after the impact force is over, the vibrating reed 3 is restored to its original state, and the mechanical guide 4 of the armature is located at the end position of the vibrating reed 3.
Example 2:
as shown in fig. 5 to 8, a low eddy current magnetic loss armature apparatus for an electroacoustic transducer includes: a yoke 1, a coil 2, a vibrating piece 3, a mechanical guide rod 4, a first magnet 5 and a second magnet 6; a first magnet 5 and a second magnet 6 are arranged in parallel in the magnetic yoke 1, and the first magnet 5 and the second magnet 6 are aligned up and down; an air gap is formed between the first magnet 5 and the second magnet 6; a coil 2 is arranged on one side surface of the magnetic yoke 1; the vibrating piece 3 is U-shaped, one short side of the vibrating piece 3 is fixed on the outer surface of the magnetic yoke 1, and the other long side of the vibrating piece passes through the hollow position in the middle of the coil 2 and extends into the magnetic yoke 1 all the way to pass through an air gap between the first magnet 5 and the second magnet 6; the mechanical guide 4 is provided on the surface of the longer side of the vibrating piece 3.
Further, the magnetic yoke 1 comprises a magnetic conduction sheet 11, a magnetic conduction sheet 12, a first positioning sheet 13, a second positioning sheet 14, a first opening magnetic conduction sheet 17 and a second opening magnetic conduction sheet 18; lugs 20 are arranged at the center positions of the two sides of the first positioning sheet 13 and the second positioning sheet 14; the middle parts of the upper ends of the first opening magnetic conduction sheet 17 and the second opening magnetic conduction sheet 18 are respectively provided with a notch 21; the positions of the return-type magnetic conducting sheet 11, the magnetic conducting sheet 12, the first positioning sheet 13, the second positioning sheet 14, the first opening magnetic conducting sheet 17 and the second opening magnetic conducting sheet 18 are sequentially arranged from left to right; the mechanical guide 4 is provided in the middle of the vibrating piece 3 and passes through the notch 21.
Further, the upper surface of the first magnet 5 is attached to the inner upper surface of the yoke 1; the lower surface of the second magnet 6 is bonded to the inner lower surface of the yoke 1.
Further, the yoke 1 is made of a high magnetic conductive alloy.
Further, the magnetic conductive sheet 11, the magnetic conductive sheet 12, the first positioning sheet 13, the second positioning sheet 14, the first opening magnetic conductive sheet 17 and the second opening magnetic conductive sheet 18 are connected together through riveting.
When in use, the magnetic yoke 1 is provided with two open magnetic conductive sheets with C-shaped openings, namely a first open magnetic conductive sheet 17 and a second open magnetic conductive sheet 18; the opening is used for enabling the mechanical guide rod 4 of the armature to penetrate out, so that a middle guide rod driving mode is formed; the mechanical guide 4 is located at the middle of the vibrating end of the vibrating piece 3 at this time.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (6)
1. A low eddy current magnetic loss armature assembly for an electroacoustic transducer comprising: a yoke, a coil, a vibrating piece, a mechanical guide rod, a first magnet and a second magnet; a first magnet and a second magnet are arranged in parallel in the magnetic yoke, and the first magnet and the second magnet are aligned up and down; an air gap is formed between the first magnet and the second magnet; a coil is arranged on one side surface of the magnetic yoke; the vibrating piece is U-shaped, one short side of the vibrating piece is fixed on the outer surface of the magnetic yoke, the other long side of the vibrating piece passes through the hollow position in the middle of the coil and extends into the magnetic yoke all the time and passes through an air gap between the first magnet and the second magnet; the mechanical guide rod is arranged on the surface of the longer side of the vibrating piece;
the magnetic yoke comprises a loop-shaped magnetic conductive sheet, a first positioning sheet, a second positioning sheet, a first impact protection sheet and a second impact protection sheet; lugs are arranged at the center positions of the two sides of the first positioning sheet and the second positioning sheet; the upper and lower side centers of the first impact protection sheet and the second impact protection sheet are respectively provided with a bump; the positions of the return-type magnetic conduction sheet, the first positioning sheet, the second positioning sheet, the first impact protection sheet and the second impact protection sheet are sequentially arranged from left to right; the mechanical guide rod is arranged at the end point of the longer side of the vibrating piece;
the upper surface of the first magnet is attached to the inner upper surface of the magnetic yoke; the lower surface of the second magnet is attached to the inner lower surface of the magnetic yoke.
2. A low eddy current magnetic loss armature assembly for an electroacoustic transducer according to claim 1 wherein the yoke is made of a high magnetic permeability alloy.
3. The armature apparatus of claim 1, wherein the magnetic conductive sheet, the first positioning sheet, the second positioning sheet, the first impact protection sheet and the second impact protection sheet are connected together by riveting.
4. A low eddy current magnetic loss armature assembly for an electroacoustic transducer comprising: a yoke, a coil, a vibrating piece, a mechanical guide rod, a first magnet and a second magnet; a first magnet and a second magnet are arranged in parallel in the magnetic yoke, and the first magnet and the second magnet are aligned up and down; an air gap is formed between the first magnet and the second magnet; a coil is arranged on one side surface of the magnetic yoke; the vibrating piece is U-shaped, one short side of the vibrating piece is fixed on the outer surface of the magnetic yoke, the other long side of the vibrating piece passes through the hollow position in the middle of the coil and extends into the magnetic yoke all the time and passes through an air gap between the first magnet and the second magnet; the mechanical guide rod is arranged on the surface of the longer side of the vibrating piece;
the magnetic yoke comprises a magnetic conduction sheet, a first positioning sheet, a second positioning sheet, a first opening magnetic conduction sheet and a second opening magnetic conduction sheet; lugs are arranged at the center positions of the two sides of the first positioning sheet and the second positioning sheet; notches are formed in the middle of the upper ends of the first opening magnetic conduction sheet and the second opening magnetic conduction sheet; the positions of the return-type magnetic conductive sheet, the first positioning sheet, the second positioning sheet, the first opening magnetic conductive sheet and the second opening magnetic conductive sheet are sequentially arranged from left to right; the mechanical guide rod is arranged in the middle of the vibrating piece and penetrates through the notch;
the upper surface of the first magnet is attached to the inner upper surface of the magnetic yoke; the lower surface of the second magnet is attached to the inner lower surface of the magnetic yoke.
5. A low eddy current magnetic loss armature assembly for an electroacoustic transducer according to claim 4 wherein the yoke is made of a high magnetic permeability alloy.
6. The armature apparatus of claim 4, wherein the magnetic conductive sheet, the first positioning sheet, the second positioning sheet, the first open magnetic conductive sheet and the second open magnetic conductive sheet are connected together by riveting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910344569.2A CN110022518B (en) | 2019-04-26 | 2019-04-26 | Low-eddy-current magnetic-loss armature device for electroacoustic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910344569.2A CN110022518B (en) | 2019-04-26 | 2019-04-26 | Low-eddy-current magnetic-loss armature device for electroacoustic transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110022518A CN110022518A (en) | 2019-07-16 |
| CN110022518B true CN110022518B (en) | 2024-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910344569.2A Active CN110022518B (en) | 2019-04-26 | 2019-04-26 | Low-eddy-current magnetic-loss armature device for electroacoustic transducer |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008141274A (en) * | 2006-11-30 | 2008-06-19 | Citizen Electronics Co Ltd | Electroacoustic transducer |
| CN202679613U (en) * | 2012-01-04 | 2013-01-16 | 苏州恒听电子有限公司 | Mechanical-shock-resistance armature device for moving-iron type receiver/speaker |
| CN103024645A (en) * | 2011-09-27 | 2013-04-03 | 苏州新吴光电科技有限公司 | Magnetic yoke device for moving-iron type microphone/transducer |
| CN104301842A (en) * | 2014-10-08 | 2015-01-21 | 苏州亿欧得电子有限公司 | Electroacoustic transducer with impact protection function |
| KR101504708B1 (en) * | 2013-12-24 | 2015-03-20 | 주식회사 엠소닉 | Speaker |
| CN105228045A (en) * | 2015-09-30 | 2016-01-06 | 苏州亿欧得电子有限公司 | Self-align receiver |
| CN106714053A (en) * | 2016-11-29 | 2017-05-24 | 深圳倍声声学技术有限公司 | Moving iron type receiver |
| CN107135450A (en) * | 2017-06-02 | 2017-09-05 | 苏州亿欧得电子有限公司 | A kind of moving-iron receiver with new vibrating diaphragm support |
| CN207219037U (en) * | 2017-12-27 | 2018-04-10 | 王点 | A kind of blade of a sword iron, armature and receiver |
| CN209526881U (en) * | 2019-04-26 | 2019-10-22 | 苏州亿欧得电子有限公司 | A kind of low vortex magnetic loss armature device for electroacoustic transducer |
-
2019
- 2019-04-26 CN CN201910344569.2A patent/CN110022518B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008141274A (en) * | 2006-11-30 | 2008-06-19 | Citizen Electronics Co Ltd | Electroacoustic transducer |
| CN103024645A (en) * | 2011-09-27 | 2013-04-03 | 苏州新吴光电科技有限公司 | Magnetic yoke device for moving-iron type microphone/transducer |
| CN202679613U (en) * | 2012-01-04 | 2013-01-16 | 苏州恒听电子有限公司 | Mechanical-shock-resistance armature device for moving-iron type receiver/speaker |
| KR101504708B1 (en) * | 2013-12-24 | 2015-03-20 | 주식회사 엠소닉 | Speaker |
| CN104301842A (en) * | 2014-10-08 | 2015-01-21 | 苏州亿欧得电子有限公司 | Electroacoustic transducer with impact protection function |
| CN105228045A (en) * | 2015-09-30 | 2016-01-06 | 苏州亿欧得电子有限公司 | Self-align receiver |
| CN106714053A (en) * | 2016-11-29 | 2017-05-24 | 深圳倍声声学技术有限公司 | Moving iron type receiver |
| CN107135450A (en) * | 2017-06-02 | 2017-09-05 | 苏州亿欧得电子有限公司 | A kind of moving-iron receiver with new vibrating diaphragm support |
| CN207219037U (en) * | 2017-12-27 | 2018-04-10 | 王点 | A kind of blade of a sword iron, armature and receiver |
| CN209526881U (en) * | 2019-04-26 | 2019-10-22 | 苏州亿欧得电子有限公司 | A kind of low vortex magnetic loss armature device for electroacoustic transducer |
Non-Patent Citations (3)
| Title |
|---|
| Segmented magnetic circuit simulation of the large displacement planar micro-coil actuator enclosed magnetic-yokes;Xiaidan Miao et al.;《Microelectronic Engineering》;第129卷;全文 * |
| 基于有限元分析的换能器磁致伸缩性能研究;石奇超;《万方学术》;全文 * |
| 新的电声换能器件;G.M.Sessler;《电声技术》;全文 * |
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| CN110022518A (en) | 2019-07-16 |
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