TWI544506B - Electromagnetic ring - Google Patents

Description

Electromagnetic circle

The present invention relates to an electromagnetic coil.

The electromagnetic coil is a driving device that converts electrical energy into mechanical energy of linear motion or rotational motion. Therefore, the electromagnetic coil can be used for various applications, for example, a member that is driven by a valve or the like that controls a fluid such as a liquid or a gas.

In addition, the electromagnetic coil of the linear motion type includes, for example, a plunger (mover), a stator core (stator) that accommodates the plunger so as to be slidable in the axial direction, and a stator core (stator) disposed in the stator The coil on the outer peripheral side of the core, etc. The electromagnetic coil shown above is a magnetic circuit generated by energizing a coil disposed on the outer peripheral side of the stator core, and the stator core forms a magnetic path for causing a magnetic attraction force to act on the plunger, thereby causing the plunger to face the shaft Move to.

The electromagnetic coil diagram shown above is used to improve the magnetic attraction, and to improve the driving force. In order to increase the magnetic attraction force, it is only necessary to form a magnetic path for causing a magnetic attraction force to act on the plunger, and it is considered to increase the amount of magnetic flux flowing to the plunger. Further, in order to efficiently increase the magnetic flux flowing to the plunger as described above, it is considered to reduce the stator core flowing to the region in close contact with the plunger. Magnetic flux. The technique of reducing the amount of magnetic flux flowing to the stator core as described above is exemplified by, for example, those described in Patent Document 1.

Specifically, Patent Document 1 discloses an electromagnetic coil including a stator core in which magnetic bodies, non-magnetic materials, and magnetic bodies are arranged in order in the axial direction. According to Patent Document 1, it is disclosed that it is possible to provide an electromagnetic coil having a stator core which can correspond to a large magnetic attraction force.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2003-269638

It is an object of the present invention to provide an electromagnetic coil having a sufficiently high magnetic attraction force.

An aspect of the present invention is an electromagnetic coil including: a coil that generates a magnetic force by energization; a magnetic actuator that is supported in an axially slidable manner; and a slide that can slide in the axial direction The mover is housed inside, and forms a stator for causing a magnetic attraction force due to a magnetic force generated by the coil to act on a magnetic path of the mover. The stator is a ferromagnetic layer or a non-magnetic layer in the axial direction. And a method of arranging the ferromagnetic layer in a manner in which the non-magnetic layer has a modified layer which is deteriorated by the bonding, and a ratio of a magnetic resistance of the non-magnetic layer to a magnetic resistance of the non-magnetic layer before the bonding It is 0.73 or more and is less than 1.

The above and other objects, features and advantages of the present invention will be apparent from

11‧‧‧Electromagnetic ring

12‧‧‧ mover (plunger)

13‧‧‧ Stator (stator core)

14‧‧‧ coil

15, 17‧‧‧Strong magnetic layer

16‧‧‧Non-magnetic layer

18, 19‧‧‧ Metamorphic layer

20‧‧‧non-metamorphic layer

21‧‧‧ Magnetic Circuit

22‧‧‧ air layer

23‧‧‧ leakage of magnetic flux

24‧‧‧A portion of the plunger 12 that is adjacent to the stator core 13

25‧‧‧Axis

31, 32, 33‧‧‧ cylindrical

35, 36, 37‧‧‧ cylindrical

41, 42‧‧‧ Metamorphic layer

91~95‧‧‧ line

101, 102‧‧‧ plot

C‧‧‧ axial length of metamorphic layers 18, 19

D‧‧‧ axial length of the non-magnetic layer 16

E‧‧‧ axial length relative to the portion 24 of the plunger 12 that is adjacent to the stator core 13

X‧‧‧ axial length of the metamorphic layer

Fig. 1 is a conceptual diagram for explaining the influence of a metamorphic layer in a stator provided in an electromagnetic coil according to an embodiment of the present invention.

Fig. 2 is a conceptual diagram for explaining the influence of a metamorphic layer in a stator provided in an electromagnetic coil according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view showing an electromagnetic coil according to an embodiment of the present invention.

Fig. 4 is a conceptual view for explaining a method of manufacturing a stator provided in an electromagnetic coil according to an embodiment of the present invention.

Fig. 5 is a conceptual view for explaining a method of manufacturing a stator provided in an electromagnetic coil according to an embodiment of the present invention.

Fig. 6 is a conceptual view for explaining a modified layer of a stator provided in an electromagnetic coil according to an embodiment of the present invention.

Fig. 7 is a conceptual view for explaining a modified layer of a stator provided in an electromagnetic ring according to an embodiment of the present invention.

Fig. 8 is a view for explaining conditions of an electromagnetic coil used for numerical analysis.

Fig. 9 is a graph showing the relationship between the magnetoresistance (synthetic magnetoresistance) of the non-magnetic layer and the deterioration ratio.

According to the review of the inventors of the present invention, in the invention described in Patent Document 1, the magnetic attraction force may not be sufficiently high. Specifically, when the stator is used as the stator in such a manner that the magnetic body, the non-magnetic body, and the magnetic body are arranged in the axial direction, the magnetic attraction force is not sufficiently high. situation. Further, in the invention described in Patent Document 1, the following reason is found as a reason why the magnetic attraction force is not sufficiently high. In other words, it has been found that when only a magnetic body, a non-magnetic body, and a magnetic body are arranged in the axial direction, the joint is used as a stator, and a metamorphic layer is formed at the time of joining (a part of the non-magnetic body, the magnetic permeability) The area where the rate is increased), the metamorphic layer affects the magnetic attraction.

Therefore, the inventors of the present invention have carefully studied the relationship between the magnetic resistance of the non-magnetic layer in which the altered layer is formed and the magnetic attraction force, and have considered the present invention as shown below. That is, the inventors of the present invention have found that the above object of obtaining an electromagnetic coil having a sufficiently high magnetic attraction force is achieved by the following invention.

The embodiments of the present invention are described below, but the present invention is not limited to the above.

The electromagnetic coil according to the embodiment of the present invention includes a coil that generates a magnetic force by energization, a magnetic mover that is supported to be slidable in the axial direction, and the mover that slides in the axial direction. The stator is housed inside and forms a magnetic path for causing a magnetic attraction force to act on the mover. Further, the coil is disposed in such a manner that the magnetic attraction force is generated by the generated magnetic force. Specifically, as shown in FIGS. 1 to 3 , the electromagnetic coil 11 includes a mover (plunger) 12 , a stator (stator core) 13 , and a coil 14 disposed on the outer peripheral side of the stator core 13 . Next, the stator core 13 is joined in such a manner that the axial direction is in accordance with the order of the ferromagnetic layer 15, the non-magnetic layer 16, and the ferromagnetic layer 17. Further, in the stator core 13, the non-magnetic layer 16 has two modified layers 18 and 19 which are deteriorated by the above-described joining, and a non-deteriorated layer which is not deteriorated by the joining. 20. Further, in the stator core 13, the ratio (R/R0) of the magnetic resistance (R0) of the non-magnetic layer 16 to the magnetic resistance (R0) before the bonding is 0.73 or more and less than 1. In other words, the magnetic resistance R of the non-magnetic layer 16 is 0.73 times or more of the magnetic resistance R0 of the non-magnetic layer before the bonding, and does not reach the magnetic resistance R0 of the non-magnetic layer before the bonding. In addition, when the magnetic resistance of the non-magnetic layer 16 is R and the magnetic resistance of the non-magnetic layer before the bonding is R0, 0.73 × R0 ≦ R < R0 is satisfied. However, since the non-magnetic layer 16 has the altered layers 18 and 19 and the non-altered layer 20 as described above, the magnetic resistance R of the non-magnetic layer 16 and the modified magnetic reluctance of the altered layers 18 and 19 and the non-altered layer 20 are obtained. Further, the magnetic resistance R0 of the non-magnetic layer before the bonding corresponds to the reluctance in the ideal case where the non-magnetic layer 16 is completely the non-altered layer 20.

The electromagnetic coil system as described above can sufficiently increase the magnetic attraction force. In other words, the magnetic resistance of the non-magnetic layer in the stator provided in the electromagnetic coil satisfies the relationship as described above, and the modified layer is formed at the time of the bonding, whereby the electromagnetic coil having a sufficiently high magnetic attraction force can be obtained. The influence of the metamorphic layer in the stator provided in the electromagnetic coil will be described below. Specifically, the magnetic resistance of the non-magnetic layer satisfies the relationship as described above, that is, when the volume is relatively large, for example, the case where the volume of the altered layer is small is small. Further, the magnetic resistance of the non-magnetic layer does not satisfy the above-described relationship, that is, when it is too small, for example, a case where the volume of the altered layer is large is cited.

1 and 2 are conceptual views for explaining the influence of the altered layer in the stator provided in the electromagnetic coil of the present embodiment. 1 shows that the magnetic resistance of the non-magnetic layer in the stator equipped with the electromagnetic coil is relatively large. In the case of one case, the size of the metamorphic layer is small. In addition, FIG. 2 shows a case where the metamorphic layer of one example in the case where the non-magnetic layer in the stator provided in the electromagnetic coil is small has a large volume. 3 is a schematic cross-sectional view of the electromagnetic coil of the embodiment. In addition, in FIG. 3, the metamorphic layers 18 and 19 are abbreviate|omitted.

The reason why the electromagnetic coil of the present embodiment can sufficiently increase the magnetic attraction force is based on the following.

First, the stator core 13 is interposed between the ferromagnetic layer 15 and the ferromagnetic layer 17 in the non-magnetic layer 16 in the axial direction. Thereby, the magnetic flux caused by the magnetic force generated by energization to the coil 14 is considered to flow to the plunger 12 as appropriate, instead of flowing in the axial direction of the stator core 13 as it is. That is, as shown in FIG. 1, it is considered that the stator core 13 is appropriately formed to cause the magnetic attraction force to act on the magnetic circuit 21 of the plunger 12.

The magnetic flux flowing to the plunger 12 must flow in the air layer 22 between the ferromagnetic layers 15, 17 of the stator core 13 and the plunger 12. Next, if the magnetic resistance R of the non-magnetic layer 16 having the altered layers 18 and 19 is too small, the magnetic flux easily flows to the non-magnetic layer 16. That is, if the volume of the altered layers 18, 19 is too large, as shown in FIG. 2, it is considered that not only the magnetic flux flows in the air layer 22 but also flows to the non-magnetic layer 16, or does not flow to the plunger 12 and is directly in the ferromagnetic The bulk layer 15 flows between the ferromagnetic layer 17. Therefore, if the magnetic resistance R of the non-magnetic layer 16 is too small, it is considered that the leakage 23 of the magnetic flux is likely to occur.

On the other hand, when the magnetic resistance R of the non-magnetic layer 16 is relatively small as in the above range, the occurrence of leakage of the magnetic flux is suppressed. system. That is, if the volume of the altered layers 18, 19 is small, it is considered that the occurrence of leakage of the magnetic flux is suppressed, and as shown in Fig. 1, the stator core 13 is appropriately formed to apply magnetic attraction to the magnetic circuit of the plunger 12. twenty one.

In the above case, when the ferromagnetic layer and the non-magnetic layer are joined to each other to form the stator core having the above configuration, even if the altered layer is formed by the bonding, the non-magnetic layer interposed between the ferromagnetic layers is used. When the magnetic reluctance R of the body is within the above range, the stator core to be joined can obtain an electromagnetic coil having a sufficiently high magnetic attraction force.

Next, each configuration of the electromagnetic coil will be described.

The coil 14 is not particularly limited as long as it is a coil that acts as an electromagnetic coil due to energization. That is, the coil 14 generates a magnetic force when energized, and forms a magnetic path through the plunger 12 and the stator core 13. Specifically, the coil 14 is configured by winding an elongated conductor member that is insulated and covered.

The plunger 12 is not particularly limited as long as it is used as a plunger of an electromagnetic coil. In other words, the plunger 12 is not particularly limited as long as the magnetic path is formed to cause magnetic attraction. Specifically, the plunger 12 is a series of magnetic members having a substantially cylindrical shape. The material constituting the plunger 12 is, for example, a ferromagnetic material such as iron. Further, the plunger 12 may be provided with a shaft portion 25 that transmits an output of driving of the plunger 12 by magnetic attraction to the outside. The shaft portion 25 may be connected to one end portion of the plunger 12 in the axial direction as shown in FIGS. 1 and 2, or may be connected to both end portions as shown in FIG.

In terms of the stator core 13, in addition to being formed as described above In addition, the same as those used as the stator core of the electromagnetic coil can be used. Specifically, the shape of the stator core 13 or the like may be the same shape as that of the stator core used as the electromagnetic coil. More specifically, a cylindrical shape or the like is cited.

Further, as described above, the stator core 13 is joined to the axial direction in accordance with the order of the ferromagnetic layer 15, the non-magnetic layer 16, and the ferromagnetic layer 17. Further, in the stator core 13, the non-magnetic layer 16 has two modified layers 18 and 19 which are deteriorated by the above-described joining, and a non-altered layer 20 which is not deteriorated by the above-described joining. Further, in the stator core 13, the ratio (R/R0) of the magnetic resistance (R) of the non-magnetic layer 16 to the magnetic resistance (R0) of the non-magnetic layer before the bonding is 0.73 or more and is not Up to 1. Further, the lower limit of the ratio (R/R0) is 0.73 or more, preferably 0.78 or more, and preferably 0.83 or more. Further, the upper limit of the ratio (R/R0) is less than 1, preferably 0.98 or less. If the ratio (R/R0) is too small, as described above, it is considered that the leakage of the magnetic flux cannot be sufficiently suppressed, and the magnetic attraction tends to be lowered. Further, when the ratio (R/R0) is within the above range, the magnetic attraction force can be further enhanced.

Here, the magnetoresistance (synthetic magnetoresistance) of the non-magnetic layer 16 or the magnetoresistance of the non-magnetic layer before the bonding can be measured by a method of measuring general magnetoresistance. Specifically, a measurement method using a magnetoresistive measuring device (such as a vibrating sample type magnetometer BHV-5 manufactured by Riken Electronics Co., Ltd.) or the like is used.

The altered layers 18 and 19 are made of a ferromagnetic material which becomes the ferromagnetic layers 15 and 17, and a non-magnetic material which becomes the non-magnetic layer 16 A layer formed by deterioration of a non-magnetic material when the formed materials are joined. Specifically, the modified layers 18 and 19 are a layer formed by, for example, a friction bonding method or a welding method to be described later, and a non-magnetic material is deteriorated.

Further, the volume (B) of the altered layers 18, 19 is preferably greater than 0% and 30% or less with respect to the volume (A) of the non-magnetic layer 16. That is, the total volume (B) of the altered layer 18 and the altered layer 19 is preferably greater than 0% and not more than 30% of the total volume (A) of the altered layer 18 and the non-altered layer 20 and the altered layer 19. Further, the ratio of the volume (B) of the altered layers 18, 19 to the volume (A) of the non-magnetic layer 16 is also greater than 0% and preferably 30% or less, that is, the ratio (B/A). If the deterioration ratio is too large, as described above, it is considered that the leakage of the magnetic flux cannot be sufficiently suppressed, and the magnetic attraction tends to be lowered. On the other hand, when the deterioration ratio is within the above range, even if the altered layers 18 and 19 are formed, the non-deformed layer 20 is sufficiently maintained. Therefore, it is considered that the occurrence of leakage of the magnetic flux can be further suppressed, and the stator can be more appropriately formed to make Magnetic attraction acts on the magnetic circuit of the mover. Therefore, it is considered that an electromagnetic coil having a higher magnetic attraction force can be obtained.

Further, the axial length (C) of the altered layers 18 and 19 is the total length (D) of the altered layer 18 and the axial direction of the non-altered layer 20 and the altered layer 19, that is, the axial direction of the non-magnetic layer 16. The length (D) is preferably greater than 0% and preferably 20% or less. That is, the ratio (C/D) of the axial length (C) of the altered layers 18, 19 to the axial length (D) of the non-magnetic layer 16 is preferably greater than 0% and preferably 20% or less. If the axial length (C) of the altered layers 18 and 19 is too long, as described above, it is considered that the leakage of the magnetic flux cannot be sufficiently suppressed, and the magnetic attraction force is lowered. tendency. On the other hand, when the axial length (C) of the altered layers 18 and 19 is within the above range, even if the modified layers 18 and 19 are formed, the non-altered layer 20 is sufficiently maintained, and therefore it is considered that the leakage of the magnetic flux can be further suppressed. This occurs, and the stator can more appropriately form a magnetic circuit for causing magnetic attraction to act on the mover. Therefore, it is considered that an electromagnetic coil having a higher magnetic attraction force can be obtained.

Among them, the conditions in which the altered layer 18 and the altered layer 19 are bonded to each other may be different in their respective shapes. As described above, even in the case where the volume (B) or the axial length (C) is different in the altered layer 18 and the altered layer 19, the above-described deterioration ratio (B/A) and the above ratio (C/D) are deteriorated. In each of the layers 18 and 19, it is considered that the non-altered layer 20 is sufficiently maintained within the above range. Therefore, it is considered that the occurrence of leakage of the magnetic flux can be further suppressed, and the stator can more appropriately form a magnetic path for causing the magnetic attraction force to act on the mover. Therefore, it is considered that an electromagnetic coil having a higher magnetic attraction force can be obtained.

The modified layers 18 and 19 are preferably low in magnetic permeability and close to a non-magnetic material from the viewpoint of suppressing leakage of magnetic flux. Therefore, the relative magnetic permeability of the altered layers 18 and 19 is preferably lowered in order to reduce the heat history at the time of joining. Specifically, the relative magnetic permeability of the altered layers 18, 19 is preferably in the following range. Further, the upper limit of the relative magnetic permeability of the altered layers 18 and 19 is preferably 2,000 or less, more preferably 1,000 or less, and still more preferably 500 or less. When the relative magnetic permeability of the altered layers 18 and 19 is too high, it is considered that the leakage of the magnetic flux cannot be sufficiently suppressed, and the magnetic attraction tends to be lowered. The lower limit of the relative magnetic permeability of the altered layers 18 and 19 is not particularly limited for the above reasons, but is considered to be substantially 10. Therefore, change The layers 18 and 19 preferably have a relative magnetic permeability of 10 to 2,000.

From the viewpoint of proper flow of the magnetic flux, the ferromagnetic layers 15 and 17 are preferably made to have a relatively high relative magnetic permeability. Further, the difference in relative magnetic permeability with the non-magnetic layer 16 becomes large, and it is considered that the magnetic flux is suitable to flow to the plunger 12. Therefore, it is considered that an electromagnetic coil having a higher magnetic attraction force can be obtained. In order to obtain the electromagnetic coil as described above, the ferromagnetic layers 15, 17 specifically have a magnetic permeability of more than 2,000, more preferably 4,000 or more, more preferably 6,000 or more. The above-mentioned limit is not particularly limited, but a ferromagnetic body of 100,000 or more is obtained by permalloy or the like, but it is considered to be 20,000 in terms of workability and cost. Therefore, the ferromagnetic layers 15 and 17 preferably have a relative magnetic permeability of more than 2,000 and not more than 20,000.

Further, specific examples of the material constituting the ferromagnetic layers 15 and 17 include, for example, a soft magnetic material. For the material constituting the ferromagnetic layer, more specifically, a pure iron-based soft magnetic material (ELCH 2, relative magnetic permeability: 8500) manufactured by Kobelco Steel Co., Ltd., and the like are listed.

The non-altered layer 20 is preferably one having a lower relative magnetic permeability, so that the magnetic flux is appropriately flowed to the plunger 12. The magnetic permeability of the non-magnetic layer is preferably 5 or less, and more preferably 3 or less. For the above-mentioned reasons, the above-mentioned reasons are not particularly limited, but the website of the Nippon Steel & Sumitomo Co., Ltd. ([online], [Search on June 27, 2014], Internet <URL] : http://www.ns-sc.co.jp/product/performance/magnetism/>), it is considered to be 1 or more in the industry. Therefore, the non-altered layer 20 is preferably a relative magnetic permeability of 1 to 5.

In addition, specific examples of the material constituting the non-magnetic layer 16 include Austenitic stainless steel such as SUS304 (relative magnetic permeability 1).

Here, the magnetic properties of the material used in the present embodiment, such as the relative magnetic permeability, can be measured by a known method. For example, the relative magnetic permeability can be determined as follows. First, a ring-shaped sample was produced using a wire as a material of the object to be measured. Examples of the ring-shaped sample include those having an outer diameter of 18 mm and an inner diameter of 10 mm. Further, the annular sample may be magnetically annealed. Then, the magnetic field application coil and the magnetic flux detection coil were wound in the ring-shaped sample, and the B-H curve was measured using an automatic magnetization measuring device. From the B-H curve, the relative magnetic permeability of the material to be measured can be measured. In addition, the local magnetic characteristics such as the magnetic characteristics in the electromagnetic coil cut out the object to be measured to about 5 to 10 mm square, together with the reference material of the same shape, by using a vibrating sample magnetometer (VSM). The actual measurement of the object can measure the relative magnetic permeability of the object to be measured.

The size and the like of each member of the electromagnetic coil can be appropriately selected in accordance with the required performance and the like, and the size of the general electromagnetic coil or the like can be used. Specifically, for example, the length of the non-magnetic layer 16 in the axial direction is preferably shorter than the length of the portion of the plunger 12 adjacent to the stator core 13 in the axial direction from the viewpoint of forming an appropriate magnetic path. Specifically, the ratio (D/E) of the axial length (D) of the non-magnetic layer 16 to the axial length (E) of the portion 24 of the plunger 12 adjacent to the stator core 13 is preferably in the following range. The lower limit of the ratio (D/E) is preferably 1/10 or more, more preferably 1/7 or more. More preferably 1/5 or more. Further, the upper limit of the ratio (D/E) is preferably 3/4 or less, more preferably 2/3 or less, and still more preferably 1/2 or less. When the length of the non-magnetic layer 16 in the axial direction is too short, it is considered that the leakage of the magnetic flux cannot be sufficiently suppressed, and the magnetic attraction force tends not to be sufficiently improved. Further, even if the length of the non-magnetic layer 16 in the axial direction is too long, the magnetic attraction force tends to be insufficiently increased. This is considered to be because the influence of the air layer between the plunger 12 and the stator core 13 is strong, and there is a tendency that an appropriate magnetic path cannot be formed.

Next, a method of manufacturing the stator core will be described.

The manufacturing method of the stator core is not particularly limited as long as the stator core having the above configuration can be manufactured. Specifically, the method of manufacturing the stator core is such that the magnetostrictive layer is arranged in the order of the ferromagnetic layer, the non-magnetic layer, and the ferromagnetic layer in the axial direction, and the magnetic resistance of the non-magnetic layer can be made within the above range. The stator core is not particularly limited.

The bonding is not particularly limited, and examples thereof include a welding method or a friction bonding method. Specifically, the manufacturing method of the stator core is manufactured by the following method as shown in FIG. 4 and FIG. 4 and 5 are conceptual views for explaining a method of manufacturing a stator provided in the electromagnetic coil of the embodiment. In addition, FIG. 4 shows a case where a welding method is used, and FIG. 5 shows a case where a friction bonding method is used.

First, a fusion bonding method will be described as a manufacturing method of the above bonding.

First, a material made of a ferromagnetic material is formed into a cylindrical shape by cutting or the like. Two cylindrical bodies 31 and 33 made of a ferromagnetic body as described above are prepared. In addition, a material made of a non-magnetic material is formed by cutting The shape is cylindrical. One cylindrical body 32 made of a non-magnetic material as shown above is prepared. The size of each of the cylindrical bodies may be formed to correspond to the size of the finally obtained stator core. Specifically, in terms of the diameter of the cylinder, the series is, for example, about 20 mm or the like. Next, as shown in FIG. 4, the columnar body 31 made of a ferromagnetic body and the columnar body 32 made of a non-magnetic body are joined by fusion welding so that the bottom faces are joined to each other. Next, as shown in FIG. 4, the bottom surface of the columnar body 32 made of a non-magnetic material is not joined to the bottom surface of the columnar body 31 made of a ferromagnetic material, and the columnar body 33 made of a ferromagnetic body. The bottom surfaces are joined to each other by welding. Thereby, as shown in FIG. 4, the cylindrical body arrange|positioned in the order of a ferromagnetic body, a non-magnetic body, and a magnetic body in the axial direction is obtained. Thereafter, in order to form the columnar body into a cylindrical shape, a drilling process such as cutting is performed on the center portion. Further, surface grinding or the like is performed as needed. Further, a deteriorated layer is formed between the respective materials by the aforementioned bonding. In other words, in the manufacturing method, the non-magnetic layer 32 and the ferromagnetic layer 33 including the modified layer formed in the axial direction of the ferromagnetic layer 31 and the ferromagnetic layer 31 are arranged in the axial direction. Stator core. However, the altered layer is not shown in FIG.

Further, in the welding method, a well-known welding method can be used, and it can be changed according to the accuracy of parts, cost, and the like, and is not particularly limited. Specifically, electric fusion welding, arc welding, and the like are listed. In addition, welding, such as gas, plasma, electronic wire, and laser, etc. are used. In addition, the magnetic resistance of the non-magnetic layer is a condition for forming the altered layer so as to satisfy the above range under the conditions of the welding method, that is, it is not particularly limited.

Next, a method of using the friction bonding method as the bonding method will be described.

First, a material made of a ferromagnetic material is formed into a cylindrical shape by cutting or the like. Two cylindrical bodies 35 and 37 made of a ferromagnetic body as shown above are prepared. Further, a material made of a non-magnetic material is formed into a cylindrical shape by cutting or the like. One cylindrical body 36 made of a non-magnetic material as shown above is prepared. The size of each of the cylindrical bodies may be formed to correspond to the size of the finally obtained stator core. Specifically, the diameter of the cylinder is, for example, about 20 mm or the like. However, since the cylindrical body 36 made of a non-magnetic material is cut at the time of production, it is a cylindrical body which is sufficiently long in the axial direction. However, the reason why the cylindrical body which is elongated in the axial direction is used is based on the fact that in the friction bonding method, if it is not a member having a certain length or more, it cannot be joined. Next, as shown in FIG. 5, the columnar body 35 made of a ferromagnetic body and the columnar body 36 made of a non-magnetic body are joined by friction bonding so that the bottom faces are joined to each other. Next, as shown in FIG. 5, the thickness of the cylindrical body 36 made of a non-magnetic body is cut so that the thickness in the stator core finally obtained is the thickness. Thereafter, as shown in FIG. 5, the cut surface of the cylindrical body 36 made of a non-magnetic material and the bottom surface of the cylindrical body 37 made of a ferromagnetic material are joined by friction bonding. Thereby, as shown in FIG. 5, the cylindrical body arrange|positioned in the order of a ferromagnetic body, a non-magnetic body, and a magnetic body in the axial direction is obtained. Thereafter, in order to form the columnar body into a cylindrical shape, a drilling process such as cutting is performed on the center portion. Further, in the friction bonding layer, since the burrs occur in the vicinity of the joint portion, the removal of the burrs is performed machining. Further, surface grinding or the like is performed as needed. Further, a deteriorated layer is formed between the respective materials by the aforementioned bonding. In other words, in this manufacturing method, the non-magnetic layer 36 and the ferromagnetic layer 37 including the altered layer formed in the axial direction of the ferromagnetic layer 35 and the ferromagnetic layer 35 are arranged in the axial direction. Stator core. However, the altered layer is not shown in FIG.

Further, in the friction bonding method, a conventionally known friction bonding method can be used, and is not particularly limited. In addition, the magnetic resistance of the non-magnetic layer is a condition for forming the altered layer so as to satisfy the above range under the conditions of the friction bonding method, that is, it is not particularly limited.

Next, the altered layer in the stator core manufactured by each manufacturing method will be described. 6 and 7 are conceptual views for explaining a modified layer of a stator (stator core) provided in the electromagnetic coil of the embodiment. 6 shows the case of manufacturing by the welding method, and FIG. 7 shows the case of manufacturing by the friction bonding method.

When the vicinity of the ferromagnetic layer 33 and the non-magnetic layer 32 of the stator core manufactured by the welding method as described above is observed with an optical microscope or the like, as shown in FIG. 6, it is understood that between the ferromagnetic layer 33 and the non-magnetic layer 32. Further, a deteriorated layer 41 is formed in the vicinity of the surface of the stator core. However, the cross-section of the altered layer of the stator core produced by the welding method has a triangular shape that is larger than the modified region on the outer diameter side. When the cross-sectional shape of the altered layer is a shape close to a rectangle, the axial length (C) of the altered layer is preferably greater than 0% and 20% or less with respect to the axial length (D) of the non-magnetic layer. On the other hand, if the cross-sectional shape of the metamorphic layer is close to a triangular shape The shape may be calculated by taking half of the maximum value of the axial length as the axial length (C) of the altered layer.

When the vicinity of the ferromagnetic layer 35 and the non-magnetic layer 36 of the stator core manufactured by the friction bonding method as described above is observed with an optical microscope or the like, as shown in FIG. 7, it is understood that the ferromagnetic layer 35 and the non-magnetic layer 36 are The altered layer 42 is formed wide.

The altered layers 41 and 42 were observed by SEM observation or the like, and it was confirmed that the above non-magnetic material was a deteriorated layer. The relative magnetic permeability varies depending on the material used for the non-magnetic layer or the ferromagnetic layer, the bonding conditions, and the like, but it is from 10 to 2,000, and is generally several hundreds. Specifically, if a stainless steel of the Vostian iron type is used as the non-magnetic material, the metamorphic layer is formed as a mixed phase of martensite and ferrite, and the relative magnetic permeability can be estimated to be several hundred degrees. . Among them, when manufactured by the friction bonding method, the volume of the deteriorated layer becomes extremely small.

The electromagnetic coil of the present embodiment is formed into the above-described configuration, and the magnetic attraction force is sufficiently high.

This specification is a technique for revealing various aspects as described above, in which the main techniques are summarized as follows.

An aspect of the present invention is an electromagnetic coil characterized by comprising: a coil that generates a magnetic force by energization; a magnetic actuator that is supported by being axially slidable; and is slidable in the axial direction The stator is housed inside, and a stator for causing a magnetic attraction force due to a magnetic force generated by the coil to act on a magnetic circuit of the mover is formed. The stator is a ferromagnetic layer or a non-magnetic layer in the axial direction. Magnetic layer and smooth magnetic layer In the method of the arrangement, the non-magnetic layer has a modified layer which is deteriorated by the bonding, and the ratio of the magnetic resistance of the non-magnetic layer to the magnetic resistance of the non-magnetic layer before the bonding is 0.73 or more. Not up to 1.

With the configuration as described above, it is possible to provide an electromagnetic coil having a sufficiently high magnetic attraction force.

This situation is considered to be based on the following reasons.

First, it is considered that the stator is in the axial direction, and the non-magnetic layer is interposed between the two ferromagnetic layers, thereby suppressing the magnetic flux caused by the magnetic force generated by energizing the coil in the region close to the plunger. The medium flows directly in the axial direction and flows to the mover as appropriate. Thereby, it is considered that the stator appropriately forms a magnetic circuit for causing a magnetic attraction force to act on the mover.

In addition, the magnetic flux flowing to the mover must flow in the air layer between the ferromagnetic layer of the stator and the mover. Then, when the magnetic resistance of the non-magnetic layer having the altered layer is too small with respect to the magnetic resistance of the non-magnetic layer before bonding, the magnetic flux easily flows to the non-magnetic layer having the altered layer. Therefore, it is considered that it is easy to cause not only that the magnetic flux flows in the air layer but also flows to the non-magnetic layer, or does not flow to the mover, and directly flows (splits) between the ferromagnetic layer and the ferromagnetic layer. Leakage of magnetic attraction magnetic flux. On the other hand, when the magnetic resistance of the non-magnetic layer is within the above range, it is considered that the occurrence of leakage of the magnetic flux is suppressed, and the magnetic path in which the magnetic attraction force acts on the mover is appropriately formed in the stator.

Based on the above, it is considered that the electromagnetic attraction is sufficiently high.

Further, in the aforementioned electromagnetic coil, the volume of the altered layer is relative to the front The volume of the non-magnetic layer is preferably greater than 0% and preferably 30% or less.

With the configuration as described above, an electromagnetic coil having a higher magnetic attraction force can be obtained.

This situation is considered to be based on the following reasons. If the volume of the altered layer is too large relative to the volume of the non-magnetic layer, it is considered that the leakage of the magnetic flux is likely to occur. On the other hand, when the volume of the altered layer is within the above range, it is considered that the occurrence of leakage of the magnetic flux can be further suppressed, and the stator can more appropriately form a magnetic path for causing the magnetic attraction force to act on the mover.

Based on these circumstances, it is considered to be an electromagnetic coil having a higher magnetic attraction.

Further, in the electromagnetic coil, the non-magnetic layer has two modified layers which are formed by the bonding in a portion in contact with the ferromagnetic layer, and the axial length of the two modified layers is opposite to the non-magnetic property described above. The axial length of the bulk layer is preferably greater than 0% and preferably 20% or less.

With the configuration as described above, an electromagnetic coil having a higher magnetic attraction force can be obtained.

This situation is considered to be based on the following reasons. If the length of the axial direction of the altered layer is too large with respect to the axial length of the non-magnetic layer, it is considered that the leakage of the magnetic flux is likely to occur. On the other hand, when the axial length of the modified layer is within the above range, it is considered that the occurrence of leakage of the magnetic flux can be further suppressed, and the magnetic path for the stator to exert the magnetic attraction force on the mover can be more appropriately formed.

Based on these circumstances, it is considered that an electromagnetic coil having a higher magnetic attraction force can be obtained.

Further, in the electromagnetic coil, the metamorphic layer is preferably a relative magnetic permeability of 10 to 2,000.

With the configuration as described above, an electromagnetic coil having a higher magnetic attraction force can be obtained.

It is considered that if the relative magnetic permeability of the altered layer is within the above range, the magnetic resistance of the non-magnetic layer is easily within the above range.

Further, in the electromagnetic coil, the ferromagnetic layer preferably has a relative magnetic permeability of more than 2,000 and not more than 20,000.

With the configuration as described above, an electromagnetic coil having a higher magnetic attraction force can be obtained.

This situation is considered to be based on the following reasons. First, the magnetic flux flows to the ferromagnetic layer appropriately. Next, it is considered that the difference in relative magnetic permeability with the non-magnetic layer becomes large, and the magnetic flux is appropriately and easily flows to the mover. Therefore, it is considered that the stator is more appropriately formed to apply a magnetic attraction force to the magnetic circuit of the mover. Therefore, it is considered that an electromagnetic coil having a higher magnetic attraction force can be obtained.

Further, in the electromagnetic coil, the length of the non-magnetic layer in the axial direction is preferably shorter than the axial length of the portion of the mover adjacent to the stator.

According to the configuration as described above, since the stator can form a magnetic path for causing the magnetic attraction force to act on the mover, it is possible to obtain an electromagnetic ring having a sufficiently high magnetic attraction force.

The invention is specifically illustrated by the following examples, but the invention is not limited thereto.

[Examples]

First, the result of simulating the formation of the magnetic circuit in the electromagnetic coil of the present embodiment (the numerical analysis result) will be described.

The numerical analysis was performed using an electromagnetic field analysis software (JMAG) manufactured by JSOL Co., Ltd. Next, in terms of numerical analysis conditions, first, the electromagnetic coil shown in Fig. 8 is used. FIG. 8 is a view for explaining conditions of an electromagnetic coil used for numerical analysis. Next, Fig. 8 is a case where an electromagnetic coil is artificially fabricated by a welding method. The altered layers 18 and 19 correspond to a metamorphic layer after the non-magnetic material is deteriorated, and the relative magnetic permeability is set to 400. Further, the relative magnetic permeability of the non-altered layer 20 is set to 1.

The numerical analysis results obtained under these conditions are shown in Fig. 9. Fig. 9 is a graph showing the relationship between the magnetoresistance (synthetic magnetoresistance) of the non-magnetic layer and the deterioration ratio. Here, the horizontal axis indicates the ratio (B/A) of the volume (B) of the altered layers 18 and 19 to the volume (A) of the non-magnetic layer 16 , that is, the deterioration ratio (%). Further, the vertical axis indicates the magnetic resistance (synthetic magnetic resistance) (A/Wb) of the non-magnetic layer 16. Further, the axial length (X) of the metamorphic layer is as follows. When represented by line 91, it is 1 mm. When represented by line 92, it is 2 mm. When indicated by line 93, it is 1.5 mm. When indicated by line 94, it is 0.7 mm. When indicated by line 95, it is 0.3 mm.

Among them, the review is based on the plots shown in plot 101 and plot 102.

(Example)

The case of plot 101 shows the resultant reluctance of the non-magnetic layer. (R) is 1.44A/Wb. Next, the magnetic resistance (R0) of the non-magnetic layer before bonding was 1.97 A/Wb. Thus, the ratio (R/R0) of the magnetic reluctance (R) of the non-magnetic layer 16 to the non-magnetic layer before bonding is about 0.7309, which is 0.73 or more and less than 1. In the case shown by the plot 101, the axial length (X) of the altered layer is 1 mm, and the metamorphic ratio is such that the synthetic magnetic resistance (R) of the non-magnetic layer becomes 1.44 A/Wb, and is slightly lower. In the 30% way, adjust the volume of the metamorphic layer. That is, in the case shown by the plot 101, the volume of the metamorphic layer is adjusted in such a manner that R/R0 slightly exceeds 0.73.

The magnetic attraction force of the electromagnetic ring as described above is reduced by 20% with respect to the magnetic attraction force of the electromagnetic ring formed by the friction bonding method in which the modified layer is hardly formed.

(Comparative example)

On the other hand, in the case of the plot 102, the composite magnetic reluctance (R) of the non-magnetic layer is 1.24 A/Wb. Thus, the ratio (R/R0) of the magnetic reluctance (R) of the non-magnetic layer 16 to the non-magnetic layer before bonding is about 0.6294, which is less than 0.73. In the case shown by plot 102, the axial length (X) of the altered layer is 2 mm, and the metamorphic ratio is such that the synthetic magnetic resistance (R) of the non-magnetic layer becomes 1.24 A/Wb, slightly exceeding 10 % way to adjust the volume of the metamorphic layer.

The magnetic attraction force of the electromagnetic ring as described above is reduced by 30% with respect to the magnetic attraction force of the electromagnetic ring formed by the friction bonding method in which the altered layer is hardly formed.

In the above case, an electromagnetic coil in which an altered layer is formed such that R/R0 is 0.73 or more and is less than 1, (Comparative Example), magnetic attraction is compared with a comparative example in which R/R0 is less than 0.73. It is higher. From this, it is understood that the examples are relatively high in deterioration compared with the comparative examples, and since R/R0 satisfies the range of 0.73 or more and is less than 1, the magnetic attraction force is high. In other words, it is understood that the modified layer is formed such that R/R0 satisfies the range of 0.73 or more and is less than 1, whereby an electromagnetic coil having high magnetic attraction force can be obtained.

In addition, as is clear from FIG. 9, in order to easily achieve R/R0 of 0.73 or more and less than 1, the deterioration ratio is preferably 30% or less. Therefore, it is understood that the metamorphic ratio is preferably greater than 0% and preferably 30% or less.

Further, as is clear from Fig. 9, in order to easily achieve R/R0 of 0.73 or more and less than 1, the axial length (X) of the altered layer is preferably 1 mm or more. From this, it is understood that the length of the axial direction of the altered layer is preferably greater than 0% and not more than 20% with respect to the axial length of the non-magnetic layer.

Further, the welding method is an ideal method from the viewpoint of low cost or high productivity in the manufacture of the stator of the electromagnetic coil, but a deteriorated layer is formed. In the same manner as the electromagnetic coil of the present embodiment, it is known that the welding condition of the welding layer is adjusted so that the welding layer is formed so that the R/R0 is 0.73 or more and the thickness is not up to 1 so that the modified layer is formed. It is also possible to obtain a magnetic ring with a magnetic attraction that is sufficiently high.

Further, even in the case of having other deterioration ratios, if the R/R0 is 0.73 or more and the electromagnetic coil is less than 1, an electromagnetic coil having a sufficiently high magnetic attraction force can be obtained.

This application is a Japanese patent application filed on June 30, 2014. Japanese Patent Application No. 2014-134470, the contents of which are incorporated herein by reference.

In order to present the present invention, the present invention will be appropriately described and described in detail with reference to the embodiments, and it should be understood that those skilled in the art can easily change and/or improve the above embodiments. Therefore, as long as the modified form or the modified form implemented by the skilled person in the field is not the extent of the scope of the claims of the claims described in the patent application, the modified form or the modified form is construed as being included in the Within the scope of the claim.

[Industrial availability]

According to the present invention, an electromagnetic coil having a magnetic attraction force sufficiently high is provided.

11‧‧‧Electromagnetic ring

12‧‧‧ mover (plunger)

13‧‧‧ Stator (stator core)

15, 17‧‧‧Strong magnetic layer

16‧‧‧Non-magnetic layer

18, 19‧‧‧ Metamorphic layer

20‧‧‧non-metamorphic layer

21‧‧‧ Magnetic Circuit

22‧‧‧ air layer

24‧‧‧A portion of the plunger 12 that is adjacent to the stator core 13

25‧‧‧Axis

C‧‧‧ axial length of metamorphic layers 18, 19

D‧‧‧ axial length of the non-magnetic layer 16

E‧‧‧ axial length relative to the portion 24 of the plunger 12 that is adjacent to the stator core 13

Claims (6)

An electromagnetic coil comprising: a coil that generates a magnetic force by energization; a magnetic actuator that is supported to be axially slidable; and the movable member that is slidable in the axial direction Inside, a stator for causing a magnetic attraction force due to a magnetic force generated by the coil to act on a magnetic path of the mover is formed, and the stator is a ferromagnetic layer, a non-magnetic layer, and a ferromagnetic layer in the axial direction. In the manner of the arrangement, the non-magnetic layer has a modified layer which is deteriorated by the bonding, and the ratio of the magnetic resistance of the non-magnetic layer to the magnetic resistance of the non-magnetic layer before bonding is 0.73 or more. It is less than 1. The electromagnetic coil according to claim 1, wherein the volume of the altered layer is greater than 0% and is 30% or less with respect to the volume of the non-magnetic layer. The electromagnetic coil according to claim 1, wherein the non-magnetic layer has two modified layers which are formed by the joining in a portion in contact with the ferromagnetic layer, and the axial length of the two modified layers The length in the axial direction of the non-magnetic layer is greater than 0% and 20% or less, respectively. For example, in the electromagnetic ring of claim 1, wherein the metamorphic layer has a relative magnetic permeability of 10 to 2,000. The electromagnetic coil of claim 1, wherein the ferromagnetic layer has a relative magnetic permeability of more than 2,000 and 20,000 or less. The electromagnetic coil according to claim 1, wherein the length of the non-magnetic layer in the axial direction is shorter than the length of the portion of the mover adjacent to the stator in the axial direction.