KR102431600B1 - Radial Magnetic Bearing Module with Magnetic Flux Blocker - Google Patents

Abstract

A radial magnetic bearing module having a magnetic flux blocker for achieving an objective of the present invention includes: a magnetic bearing core provided in a ring shape spaced apart from a rotor at a predetermined interval to surround the rotor; a permanent magnet provided on one side of the outer end of the magnetic bearing core; a coil wound around one side of the magnetic bearing core; and a magnetic flux blocker provided adjacent to the coil wound on one side of the bearing core to block magnetic flux leaking along the bearing core. According to the present invention, a stator-side core is manufactured in a ring shape, thereby making it easy to assemble.

Description

Radial Magnetic Bearing Module with Magnetic Flux Blocker

The present invention relates to a radial magnetic bearing module having a magnetic flux blocking part, and more particularly, by manufacturing a plurality of stator-side cores conventionally provided in a single ring shape to facilitate assembly and improve bearing precision at the same time. The present invention relates to a radial magnetic bearing module capable of maximizing active control efficiency of a rotor by a coil by preventing leakage of magnetic flux generated from a core.

Various problems such as abrasion or damage to parts caused by friction occurring in the exaggerated motion of parts such as a rotating shaft or a moving shaft with movement such as rotation or reciprocating motion, generation of noise and vibration, and energy waste problems occur. To solve this problem, various types of bearings are used.

Common bearings include mechanical friction bearings such as ball bearings, rolling bearings, and sliding bearings. However, since these mechanical friction bearings are driven in direct contact with a rotating shaft, there is a problem in that wear occurs and loss due to friction occurs. In addition, mechanical vibration and noise are generated by friction, and since continuous maintenance and replacement are required, there is a problem in that a lot of manpower and cost are consumed for maintenance.

To solve this problem, a magnetic bearing with non-contact characteristics, noise-free, non-lubricating, high-speed rotation, and eco-friendly characteristics has been developed.

Magnetic bearings are largely composed of passive magnetic bearings and active magnetic bearings.

The passive magnetic bearing has a structure that supports a rotating shaft, etc. using a magnetic levitation method that utilizes the repulsive force generated when the permanent magnets face the same pole. That is, the permanent magnet facing the rotor and the stator is configured to have the same pole, so that the repulsive force increases as the rotor approaches the stator. However, these passive magnetic bearings are difficult to control because they support the rotor by utilizing the repulsive force of the permanent magnets, and because they simply depend on the repulsive force of the permanent magnets, smooth control is difficult.

In order to solve this problem, the use of active magnetic bearings is gradually increasing.

Active magnetic bearings detect the position of the rotating body by vomiting a sensor, and then use an electromagnet to actively control the detected position of the rotating body. That is, it has a structure in which the rotating body is magnetically levitated using the attraction force generated through the electromagnet. For this purpose, a general active magnetic bearing is provided with a plurality of electromagnets radially based on the rotational center of the rotor to support the rotating body. However, since a magnetic field is not generated when no current is applied due to the characteristics of the electromagnet, an initial current and a bias current are required to maintain the center of the rotor by levitating the rotating body, so there is a problem in that power consumption is greatly increased.

In addition, the existing magnetic bearings are not easy to assemble because they use a plurality of stator-side cores around the rotating body, and they are difficult to manufacture, such as requiring a professional worker to match the concentricity of the assembled stator-side cores. have. In addition, in order to maintain the precision of the core, since a large number of fixing parts of the electromagnet module having a complex shape are required, the number of manufacturing processes increases, and accordingly, the assembly process also increases. Due to this, the manufacturing cost increases, and when maintenance or replacement is required during use, it is difficult to disassemble and assemble it. In addition, conventional magnetic bearings have problems in that it is not easy to assemble a plurality of cores, and it is difficult to match the concentricity, so that the precision of the magnetic bearing is reduced.

KR 1343879 10

The present invention is to solve the conventional problem, and it is easy to assemble by manufacturing a plurality of stator-side cores conventionally provided in a single ring shape, improving the precision of the bearing, and preventing magnetic flux generated from the core from leaking. An object of the present invention is to provide a radial magnetic bearing module capable of maximizing the active control efficiency of the rotor by the coil.

The object of the present invention is not limited thereto, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

A radial magnetic bearing module having a magnetic flux blocking unit for achieving the object of the present invention as described above is a bearing core spaced apart from a rotor and provided in a ring shape so as to surround the rotor, at one side of the outer end of the bearing core. A permanent magnet provided, a coil wound on one side of the bearing core, and a magnetic flux blocking unit provided adjacent to the coil wound on one side of the bearing core to block magnetic flux leaking along the bearing core.

In this case, an insertion groove into which the magnetic flux blocking unit is inserted may be further formed at one side adjacent to one side of the bearing core provided with the coil, and the magnetic flux blocking unit may be provided to be inserted into the insertion groove.

In addition, it may further include at least one core support provided to be inclined at a predetermined angle to one side of the bearing core provided in a ring shape.

In addition, the coil may be wound along a radial direction of the rotor to the core support.

In addition, the permanent magnet may be provided on one side of the core support.

In addition, the bearing core may include a ring-shaped first bearing core provided at one end of the core support part and a ring-shaped second bearing core provided at the other end of the core support part.

In addition, the core support part includes at least one first core support part provided to be inclined at a predetermined angle to one side of the ring-shaped first bearing core, and the first core support part to one side of the ring-shaped second bearing core, and It may include a second core support portion provided to correspond to the second core support portion, and the first core support portion and the second core support portion may be provided to be coupled to each other.

In addition, the permanent magnet may be provided on a coupling surface of the first core support part and the second core support part.

In addition, at least one pole piece may protrude from one inner side of the bearing core.

In addition, a protection part for protecting the bearing core and the coil may be further provided at one inner side of the bearing core.

In addition, the protection unit may be configured as an auxiliary bearing made of a mechanical bearing.

In addition, it may further include a sensor unit provided on one side of the bearing core to detect the displacement of the rotor.

The radial magnetic bearing module provided with the magnetic flux blocking part of the present invention has the following effects.

First, conventionally, a plurality of radially provided stator-side cores are utilized as a single ring-shaped core to facilitate manufacturing, and since a fixed component for arranging and maintaining a plurality of stator-side cores is not utilized, the structure is simple and the overall volume is reduced. has a decreasing effect.

Second, by utilizing the ring-shaped core, it is possible to improve the bearing precision by facilitating the arrangement of the coil or the arrangement of the rotor.

Third, there is an effect that the active control efficiency of the rotor is improved by the magnetic flux blocking unit blocking the leakage of magnetic flux generated in the coil.

Fourth, since the magnetic flux generated from the coil is transferred to the rotor without loss of magnetic flux by the magnetic flux blocking unit, accurate active control of the rotor is possible, so that the spindle in which the rotor is used is stably driven.

Fifth, since the ring-shaped bearing core and coil are modularized and used, when some products are repaired or replaced, disassembly and assembly of the products are easy. This has the effect of reducing maintenance costs.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention, so the present invention is limited only to the matters described in those drawings should not be interpreted as
1 is a perspective view of a radial magnetic bearing module having a magnetic flux blocker according to the present invention;
Figure 2 is an exploded perspective view of a radial magnetic bearing module having a magnetic flux block according to the present invention;
3 is a plan view of a radial magnetic bearing module having a magnetic flux blocker according to the present invention;
4 is a side view of a radial magnetic bearing module having a magnetic flux blocker according to the present invention;
5 is a cross-sectional view of a radial magnetic bearing module having a magnetic flux blocker according to the present invention;
6 is an exploded perspective view of a radial magnetic bearing module having a magnetic flux blocker according to another embodiment of the present invention;
7 is a transparent perspective view showing a simulation state for confirming magnetic flux leakage in a state in which the magnetic flux blocking unit is removed in the radial magnetic bearing module having the magnetic flux blocking unit according to the present invention;
Fig. 8 is a partially enlarged view of Fig. 7; and
9 is a graph showing the relationship between the input current versus the force according to whether or not the magnetic flux blocking part of the radial magnetic bearing module having the magnetic flux blocking part according to the present invention is provided.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only those of ordinary skill in the art to which the present invention pertains, to complete the disclosure of the present invention. It is provided to fully understand the scope of the present invention, and the present invention is only defined by the scope of the claims.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components. Like reference numerals refer to like elements throughout, and "and/or" includes each and every combination of one or more of the recited elements. Although "first", "second", etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component. Accordingly, it goes without saying that the first component mentioned below may be the second component within the technical spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly specifically defined.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Construction of radial magnetic bearing module with magnetic flux blocker

1 is a perspective view of a radial magnetic bearing module provided with a magnetic flux blocker according to the present invention, FIG. 2 is an exploded perspective view of a radial magnetic bearing module provided with a magnetic flux blocker according to the present invention, and FIG. 3 is a magnetic flux blocker according to the present invention A plan view of a radial magnetic bearing module having a portion, FIG. 4 is a side view of a radial magnetic bearing module provided with a magnetic flux block according to the present invention, and FIG. 5 is a cross-sectional view of a radial magnetic bearing module provided with a magnetic flux block according to the present invention to be. The radial magnetic bearing module 10 according to the present invention is a radial type magnetic bearing provided around a rotating shaft such as a rotor to reduce friction, preferably a hybrid homopolar type having a permanent magnet part 300 . (hybrid Homo-Polar Type) As a radial magnetic bearing, as shown in FIGS. 1 to 5 , the bearing core 100 , the permanent magnet part 300 , the coil 210 , the magnetic flux blocking part 400 , the protection part 500 and a sensor unit.

The bearing core 100 is provided to have a relatively large inner diameter compared to the outer diameter of the rotor, and is provided in a ring shape so that the rotor can be inserted therethrough. ) is a device that provides a space in which can be provided and at the same time provides a path of magnetic flux formed by the coil 210 . At this time, the bearing core 100 may be provided to surround the outer circumferential surface of the rotor in a state spaced apart from the rotor by a predetermined distance, and the permanent magnet part 300 and the coil 210 provided on one side of the bearing core 100 are easy to use. It is formed in a ring shape in which one side of the center through which the rotor passes so as to have concentricity. The bearing core 100 may be formed of a single member, but as shown in the drawings, it may be composed of a first bearing core 110 and a second bearing core 120 . In the present invention, the first bearing core 110 and the second bearing core 120 are mainly illustrated and described, but depending on the usage mode, the first bearing core 110 or the second bearing core 120 is used. ) can be used, and each of them will be described in more detail as follows.

The first bearing core 110 is formed of a ring-shaped member through which one side of the central portion is opened as a whole and the rotor can pass therethrough. In this case, one side of the first bearing core 110 may include a first pole piece 111 , a first core support 112 , and a first insertion groove 113 .

The first pole piece 111 is formed to protrude at least one on one side of the inner circumferential surface of the first bearing core 110 to provide a path of the magnetic field generated by the core. The first bearing core 110, the rotor, and the first bearing A device for uniform magnetic flux by forming a gap between the cores (110). It is preferable that a plurality of the first pole pieces 111 are provided on one side of the inner circumferential surface of the first bearing core 110, preferably a plurality of the first pole pieces 111 are provided at equal intervals, and more preferably, a plurality of the first pole pieces 111 are provided to face each other at positions corresponding to each other. Preferably, the number of coils 210 and the number corresponding to the number of coils 210 are provided so as to be opposite to each other at positions corresponding to each other. In the present invention, since four coils 210 are shown and described mainly as being provided, the first pole piece 111 is also spaced apart from one side of the inner peripheral surface of the first bearing core 110 at an angle of 90 degrees. Four first pole pieces 111 may be radially provided on the inner circumferential surface of the core 110 . As described above, each of the plurality of first pole pieces 111 may be generally formed in a flat plate shape, and the inner end may be formed to have the same curvature as the outer circumferential surface of the rotor. The first pole piece 111 forms a gap with the rotor and provides a path for magnetic flux generated from the coil 210, and the thickness, width, protrusion length, etc. of the first pole piece 111 depend on the use environment, etc. It can be manufactured in various ways taking this into account.

The first core support 112 is a connecting device for coupling with the second bearing core 120 and at the same time, a device that provides a space in which the coil 210 can be wound depending on the usage mode. The first core support 112 is formed to protrude from one side of the first bearing core 110 to be inclined at a predetermined angle from the first bearing core 110 . At this time, the coupling angle of the first core support 112 may be provided at various angles in consideration of the usage mode and the overall shape of the radial magnetic bearing module 10 , but preferably the first bearing core 110 . It is preferable to protrude vertically to one side. In addition, a plurality of first core support parts 112 may be provided at equal intervals, and preferably, a plurality of first core support parts 112 may be provided to face each other, and more preferably at a position corresponding to the first pole piece 111 . It is good to have multiple.

At least one first insertion groove 113 is provided on one side of the first bearing core 110 to provide a space into which the magnetic flux blocking unit 400 can be inserted. Although the magnetic flux blocking unit 400 may be provided in a state protruding to the outside on one side of the first bearing core 110 , it protects the magnetic flux blocking unit 400 , reduces the external volume, and stabilizes the arrangement state. It is good to be formed to maintain. At this time, the magnetic flux blocking part 400 is to prevent the magnetic flux formed by the coil 210 from leaking in the radial direction of the first bearing core 110 , and is located on one side and both sides adjacent to which the coil 210 is provided. It is good to have In one embodiment, since the coil 210 according to the present invention may be provided to surround the first core support 112 and the second core support 122 to be described later, the first insertion groove 113 is the first core. It is formed to a predetermined depth or to penetrate at both sides of the first bearing core 110 adjacent to the first core support 112 based on the support 112 . In addition, the area of the first insertion groove 113 can be made variously in size and shape corresponding to the size of the inserted magnetic flux blocking part 400 in consideration of the magnitude of the magnetic force generated by the coil 210 and the degree of magnetic flux leakage. have.

The second bearing core 120 is configured to face the first bearing core 110 in a shape corresponding to the aforementioned first bearing core 110 . At this time, the second bearing core 120 is coupled such that the first core support 112 of the first bearing core 110 and the second core support 122 of the second bearing core 120 face each other, so that the entire bearing core (100) is formed. Of course, the second pole piece 121 and the second insertion groove 123 of the second bearing core 120 are also formed to correspond to the first bearing core 110 .

Depending on the mode of use, the first core support 112 and the second core support 122 may be integrally formed, and when the first core support 112 and the second core support 122 are integrally formed, the center A groove or a through hole may be formed on one side so that the permanent magnet part 300 can be inserted. As described above, although the first core support 112 and the second core support 122 may be integrally formed, in the present invention, the coil 210 surrounds the first core support 112 and the second core support 122 . In order to facilitate the winding of the coil 210 as it is configured to be wound around, the first core support 112 and the second core support 122 have a first bearing core 110 and a second bearing core 120, respectively. ) is preferably provided individually.

The permanent magnet unit 300 is provided on one side of the bearing core 100, preferably at one side of the outer end of the bearing core to provide a bias magnetic flux for supporting the rotor. The permanent magnet part 300 is preferably provided in plurality, like the first pole piece 111 or the second pole piece 121, and preferably provided in plurality so as to be spaced apart at equal intervals, and more preferably at positions corresponding to each other. It is preferable that a plurality of coils are provided to face each other, and most preferably, a plurality of coils 210 and a number corresponding to the number of coils 210 are provided to face each other. In one embodiment, the permanent magnet part 300 is preferably disposed and coupled to one side of the core support part, preferably the coupling surface of the first core support part 112 and the second core support part 122 . In this case, the thickness of the permanent magnet part 300 may be variously formed depending on the weight and usage of the rotor, and preferably, the first core support part 112 and the second core support part 122 face each other. It is preferable to have an area corresponding to one side of the . If the first core supporting part 112 and the second core supporting part 122 are integrally formed depending on the usage mode, they may be provided to be inserted into a groove or a through hole formed on one side of the center.

The coil 210 is provided on one side of the bearing core 100 and is a device for generating magnetic force to actively control the rotor so that the rotor can maintain the rotational center by suppressing the shaking of the rotor. The coil 210 may be wound along the axial or radial direction of the rotor on one side of the bearing core 100 . In general, when the coil 210 is wound in the axial direction of the rotor, it is provided to surround the bearing core 100 . That is, in the present invention, a plurality of windings may be respectively wound on one side of at least one of the first bearing core 110 and the second bearing core 120 . In addition, when the rotor is wound in the radial direction, since it cannot be directly wound on the ring-shaped first bearing core 110 or the second bearing core 120 , it is wound on the core support. In the present invention, one side of the core support part, preferably, one side to which the first core support part 112 and the second core support part 122 are coupled, is wound to surround the permanent magnet part 300 . In this case, the direction and the number of windings in which the coil 210 is wound may be variously wound in consideration of usage patterns and the like.

In addition, the coil 210 may be directly wound on the first core support 112 and the second core support 122 , but in order to facilitate coupling of the coil 210 depending on the usage aspect, the first core on one side of the center A coil module ( 200) can be used. When using the coil base 220 as described above, the first core support 112 and the second core support 122 are connected to the coil module ( 200), as it is coupled from both sides, it is easy to manufacture and has a configuration in which winding of the coil 210 is easy.

The magnetic flux blocking part 400 is one side of the bearing core 100 , preferably one side of each of the first bearing core 110 and the second bearing core 120 , and more preferably the core supporting part on which the coil 210 is wound. It is provided on both sides of the radial direction of the first bearing core 110 and the second bearing core 120 adjacent to the coil 210 to prevent leakage of magnetic flux generated in the coil 210 . The magnetic flux blocking unit 400 can prevent the magnetic flux generated from the coil 210 from leaking along the radial direction of the first bearing core 110 and the second bearing core 120 using any device. It is also possible, but preferably a permanent magnet can be used. At this time, when a permanent magnet is used as the magnetic flux blocking unit 400 , the plurality of permanent magnets are preferably arranged to have different polarities in the inner and outer directions of the first bearing core 110 and the second bearing core 120 . . Here, the polarities of the plurality of permanent magnets used in the magnetic flux blocking unit 400 are preferably arranged to have polarities in the same direction. In one embodiment, all permanent magnets used in the magnetic flux blocking unit 400 have S poles disposed inside of the first bearing core 110 and the second bearing core 120, and all of the permanent magnets have N poles outside. It is good to place Of course, it is obvious that the polarity of the magnetic flux blocking unit 400 may be arranged to have a mutually different polarity from that of the adjacent magnetic flux blocking unit 400 depending on the usage.

6 is an exploded perspective view of a magnetic bearing module having a magnetic flux blocking unit according to another embodiment of the present invention. The magnetic bearing module 10 having a magnetic flux blocking part according to the present invention facilitates the coupling of the first bearing core 110 and the second bearing core 120 as shown in FIG. 6 according to the usage aspect, A protection unit 500 for preventing collision with the rotor may be further provided. The protection unit 500 includes the first core supporting unit 112 of the first bearing core 110 and the second core supporting unit 122 of the second bearing core 120 having a shape corresponding to each other to match each other. It facilitates the coupling of the bearing core 110 and the second bearing core 120 and assists the coupling so as to improve precision, and at the same time, as the rotor shakes due to mechanical or electronic errors during product use, the rotor moves to the bearing It is a device for preventing direct collision with the core 100 or the coil 210 . The protection part 500 is formed in a pipe shape through which the center is penetrated, preferably in a pipe shape in which both ends have a shape corresponding to the first pole piece 111 and the second pole piece 121, and in which grooves are formed to facilitate coupling. can In addition, the protection unit 500 may be formed of a mechanical bearing such as a ball bearing in order to not only prevent an impact, but also stably rotate the rotor even when the rotor contacts the protection unit 500 .

The radial magnetic bearing module 10 having the above-described configuration may further include a bearing cover (not shown) for preventing an external shock or foreign substances from flowing in, depending on usage. Such a cover is provided to cover one side of the outer surface of at least one of the first bearing core 110 or the second bearing core 120 , or to cover all the sides of the bearing core 100 in which the coil 210 is provided. can be provided. The shape of the bearing cover is not limited, and may be formed in any shape as long as it protects the radial magnetic bearing module 10 from external impact or foreign substances can be introduced.

The sensor unit (not shown) is provided on one side of the bearing core 100 or the bearing cover to detect the displacement of the rotor. Any sensor device may be used as long as the sensor unit detects the displacement of the rotor and provides information for determining whether or not the magnetic flux of the coil 210 is generated and the magnitude of the magnetic force. However, it is preferable to use a gap sensor.

Usage of radial magnetic bearing module with magnetic flux blocking part

The usage aspect of the radial magnetic bearing module 10 having the above-described configuration will be described in more detail as follows. First, the assembly process of the radial magnetic bearing module 10 will be described in more detail as follows. Here, for the convenience of description, the sequentially coupled processes will be described, but the order of each process may be changed.

First, in consideration of the power and magnetic flux direction of the radial magnetic bearing module 10 to be used in the core base, the coil module 200 is prepared by winding the coil 210 in the corresponding direction and the number of windings.

Next, the respective devices constituting the radial magnetic bearing module 10 are combined.

The magnetism of the permanent magnet utilized as the magnetic flux blocking part 400 in the first insertion groove 113 and the second insertion groove 123 formed in plurality in each of the first bearing core 110 and the second bearing core 120, respectively. Insert according to usage. In one embodiment, all of the magnetic flux blocking parts 400 inserted into the insertion grooves 113 and 123 are inserted into the insertion grooves 113 and 123 so that the S pole faces inward in the radial direction and the N pole faces the outside. can be Of course, depending on the usage, it may be inserted oppositely, or the magnetic flux blocking units 400 adjacent to each other may be inserted to have opposite polarities. The arrangement direction of the polarity of the magnetic flux blocking unit 400 or the strength of magnetic force may be provided in various ways in consideration of the usage aspect of the bearing core to be used and the magnitude of power generated by the coil 210 .

Next, the first bearing core 110 and the second bearing core 120 are coupled such that the permanent magnet part 300 and the coil 210 are disposed between the first bearing core 110 and the second bearing core 120 . do. The first core support 112 of the first bearing core 110 is inserted into one side of the through hole 221 of the coil base 220 in consideration of the winding direction of the coil 210 . Next, the permanent magnet part 300 is attached to the longitudinal section of the first core support part 112 . Depending on the mode of use, the first bearing core 110 and the coil module 200 may be combined after the permanent magnet part 300 is attached to the longitudinal cross-section of the first core support part 112 . Next, by inserting the second core support 122 of the second bearing core 120 through the through hole 221 of the other side of the coil module 200, the radial magnetic bearing having a magnetic flux blocking part according to the present invention. The coupling of the module 10 is completed. Coil 210 to wrap the permanent magnet part 300 directly on one side of the coupling part of the first bearing core 110 and the second bearing core 120 without using the modularized coil module 200 depending on the usage aspect. can be wound directly. However, when using the coil module 200, coupling is easier, and even non-professionals can easily couple the first bearing core 110 and the second bearing core 120 by matching the concentricity of the coil ( 210 is better to use a modular coil module 200 rather than a direct winding method.

If the protection unit 500 is further provided, the protection unit 500 may be first coupled before the second core supporting unit 122 is coupled to the coil module 200 and then the second core supporting unit may be coupled. At this time, since concave grooves into which the first bearing core 110 pole piece and the second bearing core 120 pole piece can be inserted are formed at both ends of the protection part 500, it is easier for even a non-professional worker to easily insert the first bearing core (110) and the concentricity of the second bearing core 120 may be coupled to match.

In addition, when the bearing cover and the sensor unit are further provided, the assembly may be completed by further combining the bearing cover and the sensor unit. The configuration of the bearing cover and the sensor unit is commonly used in the art, and a detailed description thereof will be omitted.

As described above, the magnetic bearing module 10 provided with the magnetic flux blocking unit is used in a state in which a rotating shaft such as a rotor is coupled to the inside during actual use. That is, the first bearing core 110 and the second bearing core 120 formed in a ring shape are used in a coupled state so that the rotor passes therethrough.

At this time, since the permanent magnet unit 300 generates a bias magnetic flux, even if a separate current is not supplied to the coil 210 , the rotor is levitated on one side of the center of the first bearing core 110 and the second bearing core 120 . state can be maintained. As a result, separate power, such as an initial current and a bias current for fixing the rotor to the floating and rotating positions, is not consumed, so the power used is reduced, and the cost of use is also reduced.

Thereafter, when a radial displacement of the rotor occurs during rotation of the rotor, the sensor unit detects it and transmits it to a control device. In order to correct this in the control device, a corresponding coil 210 among a plurality of radially arranged coils 210 . ) to control the current supplied to That is, by increasing the current of the coil 210 disposed in the direction opposite to the coil 210 to which the rotor is in close contact with each other, the attractive force is increased so that the rotor can return to the center. When a current is applied to the coil 210, a magnetic flux is generated in the coil, and the generated magnetic flux is the coil 210, the first core support 112, the first pole piece 111, the rotor, the second pole piece 121, and the second It has a magnetic flux path that circulates in the order of the two-core supporter 122 . Of course, it may have a magnetic flux path that rotates in the opposite direction depending on the usage.

A method of controlling the rotor by the magnetic flux generated by the coil 210 is commonly used in the art and a detailed description thereof will be omitted.

When using the radial magnetic bearing module 10 having the magnetic flux blocking unit according to the present invention combined through the above-described assembly process, compared to the case without the magnetic flux blocking unit 400, it can be confirmed that the performance is improved as follows. have.

7 is a transparent perspective view showing a simulation state for confirming magnetic flux leakage in a state in which the magnetic flux blocking unit is removed in the radial magnetic bearing module having the magnetic flux blocking unit according to the present invention, and FIG. 8 is a partially enlarged view of FIG. 7 . 7 and 8, the simulation is performed by removing the magnetic flux blocking unit 400 from the bearing core 100 according to the present invention, that is, the first bearing core 110 and the second bearing core 120. As a result, it can be seen that the magnetic flux generated in the coil 210 is leaked along the radial direction of the body of the first bearing core 110 and the second bearing core 120 having a ring shape. As such, as the magnetic flux is leaked, the bearing support force (N) compared to the current (A) input to the coil 210 is reduced than the set value. That is, when a user inputs a current corresponding to this to the coil 210 to obtain a bearing bearing capacity of 50, when a magnetic flux leakage occurs, a bearing bearing force corresponding to 50 is not output, so it may be difficult to control the stable rotor. . In order to confirm this more clearly, it will be described in more detail with reference to data comparing the output of the bearing bearing force according to the input current according to the case in which the magnetic flux blocking unit 400 is not provided and the case in which the magnetic flux blocking unit 400 is not provided.

9 is a graph showing the relationship between input current and force according to whether or not the magnetic flux blocking unit 400 of the radial magnetic bearing module having the magnetic flux blocking unit according to the present invention is provided. The graph shown in FIG. 9 is a graph showing the bearing support force output compared to the current input to the coil 210 according to the presence or absence of the magnetic flux blocking unit 400 in the radial magnetic bearing having the same structure. Here, the horizontal axis represents the amount of current input to the coil 210 , and the vertical axis represents the bearing bearing force output accordingly. In addition, in the graph, the case in which the magnetic flux blocking unit 400 is provided is indicated by a small square (blue graph) and a large square (red graph) in which the magnetic flux blocking unit 400 is not provided.

As can be clearly seen from the graph, when the same current is input to the coil 210 , it can be confirmed that a relatively large bearing bearing force is output compared to the case in which the magnetic flux blocking unit 400 is not provided as a whole. This is to output a relatively large bearing support force when the same current is input because the magnetic flux blocking unit 400 blocks the leaking magnetic flux and the magnetic flux is generated only in the intended magnetic flux path.

In particular, when comparing in the low current band, it can be seen that the output relative to the current is linear when the magnetic flux blocking unit 400 is provided, but nonlinear when the magnetic flux blocking unit 400 is not provided. Accordingly, when the magnetic flux blocking unit 400 is not provided, it can be confirmed that it is more difficult to control the rotor in the low current band compared to the high current band.

However, when the magnetic flux blocking unit 400 is provided, it can be seen that the input and output appear constantly from the moment the current is input to the coil 210 to the high current band. Accordingly, the user can accurately measure and control the bearing support force output compared to the current input to the coil 210, and through this, the active control of the rotor can be easily performed without error. Through this, by quickly and easily controlling the displacement of the rotor when it occurs, the driving stability of the device is improved when applied to a device such as a spindle in which the radial magnetic bearing module 10 having a magnetic flux blocking unit according to the present invention is used. Maximizing effects can occur.

As described above, those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention.

10: radial magnetic bearing module with magnetic flux blocking
100: bearing core
110: first bearing core
111: first pole piece
112: first core support part
113: first insertion groove
120: second bearing core
121: 2nd play
122: second core support part
123: second insertion groove
200: coil module
210: coil
220: coil base
221: through hole
300: permanent magnet
400: magnetic flux blocking unit
500: protection

Claims (12)

a bearing core spaced apart from the rotor by a predetermined distance and provided in a ring shape integrally formed to surround the rotor;
a permanent magnet provided on one side of the bearing core;
a coil wound on one side of the bearing core; and
a magnetic flux blocking unit provided adjacent to the coil wound on one side of the bearing core to block magnetic flux leaking along the bearing core;
including,
The bearing core is provided to be spaced apart by a predetermined distance and includes a first bearing core and a second bearing core integrally formed in a ring shape,
At least one first core support portion protruding at a predetermined angle obliquely to one side of the first bearing core is provided;
A second core support portion is provided on one side of the second bearing core to correspond to the first core support portion,
The permanent magnet is provided between the connection surface to which the first core support part and the second core support part are connected,
The coil is a radial magnetic bearing module having a magnetic flux blocking part wound along a radial direction of the rotor so as to surround at least one side of at least one of the first core support part and the second core support part. According to claim 1,
An insertion groove into which the magnetic flux blocking unit is inserted is further formed at one side adjacent to one side of the bearing core provided with the coil, and the magnetic flux blocking unit is provided with a magnetic flux blocking unit to be inserted into the insertion groove. delete delete delete delete delete delete According to claim 1,
A radial magnetic bearing module having a magnetic flux blocking portion in which at least one pole piece protrudes from one inner side of the bearing core. According to claim 1,
A radial magnetic bearing module having a magnetic flux blocking unit further provided with a protection unit for protecting the bearing core and the coil at one inner side of the bearing core. 11. The method of claim 10,
The protection unit is a radial magnetic bearing module having a magnetic flux blocking unit composed of an auxiliary bearing composed of a mechanical bearing. According to claim 1,
A radial magnetic bearing module having a magnetic flux blocking unit provided on one side of the magnetic bearing core and further comprising a sensor unit for detecting a displacement of the rotor.

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