CN110828158A - Method for releasing coil winding stress - Google Patents
Method for releasing coil winding stress Download PDFInfo
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- CN110828158A CN110828158A CN201911204478.5A CN201911204478A CN110828158A CN 110828158 A CN110828158 A CN 110828158A CN 201911204478 A CN201911204478 A CN 201911204478A CN 110828158 A CN110828158 A CN 110828158A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/06—Coil winding
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- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
The invention discloses a method for releasing coil winding stress, which comprises the following steps: 1) establishing a magnetic field; 2) placing the coil in a magnetic field, and enabling the current direction of the coil to be vertical to the magnetic force line of the magnetic field; 3) the coil is electrified, so that the coil is subjected to reciprocating force in a magnetic field to generate stretching vibration. The coil is arranged in the magnetic field and is electrified, and the current direction of the coil is vertical to the magnetic force line of the magnetic field, so that the coil is subjected to reciprocating transformation force in the magnetic field, and the micro-amplitude telescopic vibration is generated, the winding stress in the coil is eliminated, the winding stress of the coil can be thoroughly removed, the qualification rate of the coil is improved, the operation is simple and convenient, the efficiency is high, and the coil is suitable for batch production.
Description
Technical Field
The invention relates to the technical field of high-precision instruments, in particular to a method for releasing coil winding stress.
Background
At present, the technologies for eliminating the residual stress of the product mainly include natural aging, thermal aging, vibration aging, ultrasonic waves and the like, but most of the technologies are directed to the processing stress of metal or nonmetal structural parts. For coils wound by conductors, such as enameled wire coils and the like, stress is mostly eliminated by high-low temperature aging treatment at present.
Because the insulating layer of the conductor and the coil viscose glue have limited high temperature resistance, the temperature difference range of the conductor and the coil viscose glue can not exceed 150 ℃ generally when high and low temperature aging is adopted. After the aging treatment at high and low temperatures, the stress of the coil still remains relatively large, and the size, shape and the like of the coil have micro-changes along with the time, and the micro-changes can cause the precision change of devices and even cause the cracks of other connected structural components for high-precision application occasions such as precision instruments, precision torquers, high-precision magnetic sensors and the like.
Therefore, it is a research direction of those skilled in the art to design a winding stress releasing method for a coil applied in a high-precision scene.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the problems that the winding stress of the coil used in the high-precision scene is not completely released, so that the coil cannot meet the precision requirement and has low qualification rate, and provides a method for releasing the winding stress of the coil, which can completely remove the winding stress of the coil, so that the coil has high qualification rate, is simple and convenient to operate, has high efficiency and is suitable for batch production.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows:
a method of relieving coil winding stress comprising the steps of:
1) establishing a magnetic field;
2) placing the coil in a magnetic field, and enabling the current direction of the coil to be vertical to the magnetic force line of the magnetic field;
3) the coil is electrified, so that the coil is subjected to reciprocating force in a magnetic field to generate stretching vibration.
The coil is arranged in the magnetic field and is electrified, the current direction of the coil is kept to be vertical to the magnetic force line of the magnetic field, the coil is subjected to reciprocating force in the magnetic field, and therefore stretching vibration with small amplitude is generated, and the effect of eliminating winding stress in the coil is achieved. The amplitude and the frequency of the vibration of the coil are controlled by controlling the magnitude and the frequency of the current input by the coil, so that the aim of eliminating the winding stress in the coil for the coils with different wire diameters, sizes and shapes is fulfilled. The method provided by the invention can set the magnetic field and the current according to the diameter, the size and the shape of the coil wire, so that the vibration strength and the frequency of the coil can be adjusted, the winding stress of the coil can be thoroughly released, the qualification rate of the coil is improved, the operation is simple and convenient, the efficiency is high, and the method is suitable for batch production.
Further, the device also comprises a stress release device; the stress release device comprises a magnetic field generator and two yokes, wherein the magnetic field generator is positioned between the two yokes and fixedly connected with the yokes, and a coil placing position is formed between the two yokes. Thus, the magnetic lines of force generated by the magnetic field generator form a required magnetic loop through the yoke, and the magnetic energy loss is reduced.
Further, magnetic field generator is the cylindricality structure, its both ends respectively with two the middle part of yoke is fixed continuous, the coil is placed the position and is located magnetic field generator's the outside, like this, is convenient for put into the coil.
Furthermore, magnetic field generator is the loop configuration, its both ends respectively with two the middle part of yoke is fixed continuous, the position is located magnetic field generator's inboard is placed to the coil, also can realize the stress relief to the coil like this.
Further, when the magnetic field generator is a permanent magnet, alternating current is input to the coil, so that the coil can be acted by ampere force in a magnetic field, and the direction of the ampere force is continuously changed due to the change of the current, so that the coil reciprocates and generates telescopic vibration.
Furthermore, the magnetic field generator is an electromagnet, alternating current is input to the coil, and the coil can also reciprocate under the action of ampere force in a magnetic field to generate telescopic vibration.
Compared with the prior art, the invention has the following advantages:
the coil is arranged in the magnetic field and is electrified, the current direction of the coil is kept to be vertical to the magnetic force line of the magnetic field, the coil is subjected to reciprocating force in the magnetic field, and therefore stretching vibration with small amplitude is generated, and the effect of eliminating winding stress in the coil is achieved. The amplitude and the frequency of the vibration of the coil are controlled by controlling the magnitude and the frequency of the current input by the coil, so that the aim of eliminating the winding stress in the coil for the coils with different wire diameters, sizes and shapes is fulfilled. The method provided by the invention can set the magnetic field and the current according to the diameter, the size and the shape of the coil wire, so that the vibration strength and the frequency of the coil can be adjusted, the winding stress of the coil can be thoroughly released, the qualification rate of the coil is improved, the operation is simple and convenient, the efficiency is high, and the method is suitable for batch production.
Drawings
FIG. 1 is a schematic view of a stress relief apparatus according to the present invention.
Fig. 2 is another schematic view of the stress relieving apparatus of the present invention.
FIG. 3 is a schematic diagram of the ampere force applied to the coil in the present invention.
Fig. 4 is a schematic diagram of the ampere force applied to the coil in the magnetic field (the current direction is opposite to that in fig. 3).
Fig. 5 is a schematic view of a coil in embodiment 1.
Fig. 6 is a schematic view of a stress relieving apparatus used in example 1.
Fig. 7 is a cloud simulated finite element magnetic circuit of the cross section of the magnetic field generator 1/2 in example 1.
FIG. 8 is a graph of the working air gap flux density of the magnetic field generator of example 1.
In the figure: coil 1, magnetic field generator 2, yoke 3.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
A method of relieving coil winding stress comprising the steps of:
1) a magnetic field is established.
A magnetic field is established by adopting a stress release device, the stress release device comprises a magnetic field generator 2 and two yokes 3, the magnetic field generator 2 is positioned between the two yokes 3 and is fixedly connected with the yokes 3, and a coil placement position is formed between the two yokes 3. Thus, the magnetic force lines generated by the magnetic field generator 2 form a required magnetic circuit through the yoke 3, and the magnetic energy loss is reduced. In specific implementation, referring to fig. 1, the magnetic field generator 2 is a cylindrical structure, two ends of the magnetic field generator are respectively and fixedly connected with the middle parts of the two yokes 3, and the coil 1 is placed and positioned outside the magnetic field generator 2. Or referring to fig. 2, the magnetic field generator 2 is an annular structure, two ends of the annular structure are respectively and fixedly connected with the middle parts of the two yokes 3, and the coil 1 is positioned at the inner side of the magnetic field generator 2.
2) The coil 1 is placed in a magnetic field such that the direction of the current in the coil 1 is perpendicular to the magnetic lines of the magnetic field.
Specifically, the coil 1 is placed in the coil placement position, and the current direction of the coil 1 is perpendicular or approximately perpendicular to the magnetic force lines of the magnetic field, so that the coil 1 is acted by a large ampere force, the ampere force of the coil 1 in the magnetic field is shown in fig. 3 and fig. 4, as can be known from an ampere force formula F-nbisin α, the magnitude of the ampere force is proportional to the number n of turns of the coil, the magnetic induction B, the current I passing through the coil, the average circumference l of each turn of the coil and the sine value of the included angle α of the current and the magnetic force lines, and the direction, the magnetic induction B and the current I passing through the coil satisfy the left-hand rule.
3) The coil is electrified, so that the coil is subjected to reciprocating force in a magnetic field to generate stretching vibration.
In specific implementation, the magnetic field generator 2 may adopt a permanent magnet or an electromagnet. When the magnetic field generator 2 is a permanent magnet, the magnetic circuit is a steady magnetic field, and the coil 1 can vibrate only by introducing alternating current, so that the coil 1 can be acted by ampere force in the magnetic field, and the coil 1 can reciprocate to generate telescopic vibration. When the electromagnet is adopted, alternating current can be introduced into the coil 1 to generate vibration, an alternating magnetic field can also be formed through the electromagnet, the lead of the coil 1 is in short circuit, the coil 1 generates eddy current in the alternating magnetic field, the ampere force generated by the eddy current in the magnetic field can also generate vibration, and at the moment, the eddy current effect in the yoke 3 is considered to be reduced.
In practical application, for coils 1 with different sizes, different wire diameters of enameled wires and even different types of adhesives, the required magnetic induction intensity, alternating current frequency and current intensity need to be determined through experiments. The magnetic induction intensity is determined by the magnetic circuit of the magnetic field generator 2, generally can reach about 0.5T (based on the measured value), the maximum value of the alternating current frequency is determined by power supply equipment, and the requirement can be met generally when the frequency is 100 kHz. When the device works, the initial current intensity is preset (determined by the high-frequency current carrying capacity which can be borne by the enameled wire and can be obtained by table lookup calculation), frequency sweep vibration aging is carried out in the range of 0 kHz-100 kHz of power frequency, and the duration of each cycle can be set according to experience, such as 0.5h for one group. And determining the optimal and most economical sweep frequency vibration time by comparing the parameters of resistance, inductance and the like of the coil 1 after vibration aging of different durations. For the coils 1 with the same specification, the same parameters can be adopted for carrying out frequency sweep vibration aging.
Examples
The stress release device shown in fig. 6 is adopted, wherein the magnetic field generator is a permanent magnet with a cylindrical structure, the coil is arranged outside the magnetic field generator, the upper yoke and the lower yoke are both made of annealed steel No. 10, the permanent magnet is made of neodymium iron boron N35, the permanent magnet is axially magnetized, the upper end surface and the lower end surface of the permanent magnet are respectively in close contact with the inner end surfaces of the upper yoke and the lower yoke, an annular air gap with the thickness of 4mm is arranged between the outer end surfaces of the upper yoke and the lower yoke, the coil is wound by a copper round enameled wire with the diameter of 0.2mm as shown in fig. 5, the number of turns is 36, the mass is 0.4mg, the enameled wire can pass through the rated current of 0.1A, and the long edge (the edge length is about 0.012m) of the coil is stressed in the magnetic field of 0.53T according to an ampere force calculation:
F＝nBIlsinα＝36×0.53×0.1×0.012×sin90°＝0.023N
after the long side of the coil receives an ampere force, a vibration acceleration a is applied to the long side, and the magnitude of the vibration acceleration a is as follows:
a＝F/m＝0.023÷(0.4×10-3×0.5)＝115m/s2≈11.7g
corresponding to a vibration acceleration of 11.7g applied to the long side of the coil. If a traditional vibration table is adopted, the acceleration higher than 5g is generally not set during the fixed acceleration frequency sweep due to the stroke limit of the vibration table.
Since the stress relief device adopted in the present embodiment is an axisymmetric structure, finite element calculation can be performed by adopting 1/2 cross section to obtain the magnetic flux density inside the yoke and the magnetic flux density at the air gap, see fig. 7 and 8. In fig. 7, lines represent the trend of magnetic lines of force in the magnetic circuit, the gray shades inside the yoke and the magnetic steel represent the magnetic flux density inside the yoke and the magnetic steel, and lighter colors represent higher magnetic flux density, and conversely represent lower magnetic flux density (limited to the cross sections of the yoke and the magnetic steel). In order to calculate the distribution of the magnetic flux density in the air gap, a straight line can be drawn in the air gap, and the distribution of the magnetic flux density along the straight line can be calculated. The magnetic density distribution is shown in FIG. 8, and the result shows that the air gap magnetic density is relatively uniform and can reach 0.53T within the range of 4mm to 14mm of a straight line, and a strong magnetic field of up to 0.53T can be obtained by placing a coil needing stress relief at the position. Therefore, the stress release device provided by the invention can completely replace the traditional vibration table, so that the coil can achieve a better vibration stress removal effect.
If the stress relief device shown in fig. 2 is adopted, compared with fig. 1, under the same external dimensions, the volume of the permanent magnet is larger, the magnetic density B in the air gap is also larger than that of the air gap of the structure shown in fig. 1, and according to the ampere force calculation formula F ═ nbils α, the ampere force received by the same coil in the stress relief device shown in fig. 2 is larger than that received in the stress relief device shown in fig. 1, so that the stress relief device is suitable for coils with large rigidity (for example, enameled wires are thin, and the wound coil section is thick) and with limited current passing through the coil wire.
Certainly, other means can generate a strong magnetic field at present, for example, a halbach array (HalbachArray) is adopted, the strong magnetic field is obtained by using permanent magnets in a special arrangement mode (the magnetic density of the existing halbach array with a small volume can reach more than 1T), and the strong magnetic field can also provide magnetic energy required by electromagnetic vibration for the coil, so that the winding stress of the coil is removed.
The coil is arranged in the magnetic field and is electrified, the current direction of the coil is kept to be vertical to the magnetic force line of the magnetic field, the coil is subjected to reciprocating force in the magnetic field, and therefore stretching vibration with small amplitude is generated, and the effect of eliminating winding stress in the coil is achieved. The amplitude and the frequency of the vibration of the coil are controlled by controlling the magnitude and the frequency of the current input by the coil, so that the aim of eliminating the winding stress in the coil for the coils with different wire diameters, sizes and shapes is fulfilled. The method provided by the invention can set the magnetic field and the current according to the diameter, the size and the shape of the coil wire, so that the vibration strength and the frequency of the coil can be adjusted, the winding stress of the coil can be thoroughly released, the qualification rate of the coil is improved, the operation is simple and convenient, the efficiency is high, and the method is suitable for batch production.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (6)
1. A method of relieving coil winding stress comprising the steps of:
1) establishing a magnetic field;
2) placing the coil in a magnetic field, and enabling the current direction of the coil to be vertical to the magnetic force line of the magnetic field;
3) the coil is electrified, so that the coil is subjected to reciprocating force in a magnetic field to generate stretching vibration.
2. A method of releasing coil winding stress as claimed in claim 1, further comprising stress releasing means; the stress release device comprises a magnetic field generator and two yokes, wherein the magnetic field generator is positioned between the two yokes and fixedly connected with the yokes, and a coil placing position is formed between the two yokes.
3. A method for releasing coil winding stress as claimed in claim 2, wherein the magnetic field generator is a cylindrical structure, both ends of which are fixedly connected with the middle parts of the two yokes respectively, and the coil placement position is located at the outer side of the magnetic field generator.
4. A method for releasing coil winding stress as claimed in claim 2, wherein the magnetic field generator is a ring structure, both ends of which are fixedly connected with the middle parts of the two yokes respectively, and the coil placement position is located at the inner side of the magnetic field generator.
5. A method of releasing coil winding stress according to claim 2, characterized in that when the magnetic field generator is a permanent magnet, an alternating current is fed to the coil.
6. A method of releasing coil winding stress according to claim 2, wherein the magnetic field generator is an electromagnet and an alternating current is fed to the coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911204478.5A CN110828158A (en) | 2019-11-29 | 2019-11-29 | Method for releasing coil winding stress |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911204478.5A CN110828158A (en) | 2019-11-29 | 2019-11-29 | Method for releasing coil winding stress |
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| CN110828158A true CN110828158A (en) | 2020-02-21 |
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| CN201911204478.5A Pending CN110828158A (en) | 2019-11-29 | 2019-11-29 | Method for releasing coil winding stress |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113884083A (en) * | 2021-08-30 | 2022-01-04 | 中国船舶重工集团公司第七0七研究所 | Magnetic fluid-based hollow microstructure optical fiber loop winding stress release method |
| CN115395359A (en) * | 2022-10-28 | 2022-11-25 | 中国航天三江集团有限公司 | Method and device for inhibiting SBS (styrene-butadiene-styrene) effect of optical fiber |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543415A (en) * | 2012-02-14 | 2012-07-04 | 上海铁路通信有限公司 | Method for quickly releasing stress generated after winding of hollow coils |
| CN109842701A (en) * | 2018-12-24 | 2019-06-04 | 歌尔股份有限公司 | Screen vibration-sound generating device and electronic product |
| CN209217923U (en) * | 2018-11-27 | 2019-08-06 | 共达电声股份有限公司 | A kind of linear viberation exciter |
-
2019
- 2019-11-29 CN CN201911204478.5A patent/CN110828158A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543415A (en) * | 2012-02-14 | 2012-07-04 | 上海铁路通信有限公司 | Method for quickly releasing stress generated after winding of hollow coils |
| CN209217923U (en) * | 2018-11-27 | 2019-08-06 | 共达电声股份有限公司 | A kind of linear viberation exciter |
| CN109842701A (en) * | 2018-12-24 | 2019-06-04 | 歌尔股份有限公司 | Screen vibration-sound generating device and electronic product |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113884083A (en) * | 2021-08-30 | 2022-01-04 | 中国船舶重工集团公司第七0七研究所 | Magnetic fluid-based hollow microstructure optical fiber loop winding stress release method |
| CN113884083B (en) * | 2021-08-30 | 2023-04-28 | 中国船舶重工集团公司第七0七研究所 | Magnetic fluid-based hollow microstructure fiber loop winding stress release method |
| CN115395359A (en) * | 2022-10-28 | 2022-11-25 | 中国航天三江集团有限公司 | Method and device for inhibiting SBS (styrene-butadiene-styrene) effect of optical fiber |
| CN115395359B (en) * | 2022-10-28 | 2023-03-10 | 中国航天三江集团有限公司 | Method and device for inhibiting optical fiber SBS (styrene butadiene styrene) effect |
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