阅读说明：本技术 一种释放线圈绕制应力的方法 (Method for releasing coil winding stress ) 是由 陈邦力 梁文科 方伟 王清 *** 王超 于 2019-11-29 设计创作，主要内容包括：本发明公开了一种释放线圈绕制应力的方法，包括如下步骤：1)建立磁场；2)将线圈置于磁场中，使线圈的电流方向与磁场的磁力线垂直；3)给线圈通电，使线圈在磁场中受到往复变换的力，产生伸缩振动。本发明通过将线圈置于磁场中并给线圈通电，由于线圈的电流方向与磁场的磁力线垂直，使线圈在磁场中受到往复变换的力，从而产生微小幅度的伸缩振动，从而消除线圈中的绕制应力，能够彻底去除线圈的绕制应力，提高线圈的合格率高，并且操作简便、效率高，适合批量生产。(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.)

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.

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.