KR102431599B1 - Radial Magnetic Bearing Module - Google Patents

Abstract

Disclosed is a radial magnetic bearing module provided on a circumference of a rotor to reduce friction, which comprises: a ring-shaped magnetic bearing core provided to surround the rotor; a permanent magnet provided on an outermost side of the magnetic bearing core; and a coil provided on one side of the magnetic bearing core.

Description

Radial Magnetic Bearing Module

The present invention relates to a radial magnetic bearing module manufactured in a ring shape, and more particularly, by manufacturing a plurality of conventionally provided stator-side cores in a single ring shape, assembly is easy, precision is improved, and magnetic flux efficiency is improved. It relates to a radial magnetic bearing module with a structure that combines a passive magnetic bearing and an active magnetic bearing that can maximize the

To solve problems such as wear or damage of parts, noise problems, and energy waste problems that may occur due to friction occurring during the movement of parts (rotation shaft, moving shaft, etc.) in moving parts such as rotation or reciprocating motion Various types of bearings are used for this purpose.

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 by using the attraction force generated through the electromagnet. To this end, 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 the conventional apparatus, a plurality of stator-side cores and auxiliary bearings are separately provided and combined, so that the precision of the bearings is not constant depending on the assembly.

In addition, in order to maintain the precision of the core, which was previously divided into a plurality of pieces, a large number of fixing parts with complex shapes were required.

KR 2013-0087123 10 KR 2013-0087094 10

The present invention has been devised to solve the problems of the prior art, and an object of the present invention is to manufacture a plurality of stator-side cores in the form of a single ring, thereby making the precision of the bearing according to assembly more constant, and the precision An object of the present invention is to provide a radial magnetic bearing module that can reduce the number of parts by eliminating the need for a separate fixed part with a complex shape required to maintain the magnetic field.

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.

In order to achieve the object of the present invention as described above, the radial magnetic bearing module includes a magnetic bearing core formed in a ring shape to surround a rotor, a permanent magnet provided at the outermost portion of the magnetic bearing core, and the magnetic bearing core. Including a coil provided on one side, it is provided around the rotor to reduce friction.

In this case, the magnetic bearing core may further include a plurality of radially formed core pole pieces, and the coil may be wound around the core pole piece.

In addition, the magnetic bearing core may include a ring-shaped first core and a second core so as to be spaced apart by a predetermined distance along the axial direction of the rotor.

In this case, it may include at least one or more core supports coupled to the axial direction of the first core and the second core.

In this case, the permanent magnet may be provided on one side of the center of the core support.

In addition, the first core may further include a first core supporter and the second core may further include a second core supporter, so that the first core supporter and the second core supporter may be coupled to each other.

In this case, the permanent magnet may be provided between the coupling surface to which the first core support and the second core support are coupled to each other.

In addition, the coil may be wound on one side of at least one of the first core and the second core.

The magnetic bearing core and the coil may further include an alignment part disposed inside the coil to help precisely couple the first core and the second core.

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

The radial magnetic bearing module according to the present invention has the following effects.

First, since the core is divided into a plurality of parts, the existing structure in which the precision of the bearing journal part is not constant according to assembly is manufactured in a ring shape, so that assembly is easy and the precision is constant.

Second, in the past, a number of fixing parts for an electromagnet module having a complex shape were required to maintain the precision of the core, which was divided into a plurality of pieces. has the effect of lowering the unit price.

Third, the existing parts for fixing the electromagnet module having a complicated shape have a high probability of failure and act as a factor that deteriorates the precision, but the present invention does not require a separate part to be fixed, so there is an effect of improving the precision.

Fourth, the volume of the magnetic material in which magnetic flux is generated through the ring-shaped bearing core increases, and as a result, the ring-shaped connected core draws the magnetic flux around the coil, thereby improving the bearing bearing capacity compared to the same current.

Fifth, especially at low current, a high synergistic effect of core bearing capacity can be obtained compared to conventional bearings, and the moment when bearing bearing capacity decreases in a specific section can be accurately measured to enable easy and precise control.

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 according to the present invention;
2 is an exploded perspective view of a radial magnetic bearing module according to the present invention;
3 is a cross-sectional view of a radial magnetic bearing module according to the present invention;
4 is a transmission perspective view showing a simulation state for confirming the magnetic flux of the radial magnetic bearing module provided in the ring shape according to the present invention;
Fig. 5 is a partially enlarged view of Fig. 4;
6 is a graph showing the relationship between the bearing support force versus the current according to the number of turns of the coil of the conventional type; and
7 is a graph showing the relationship between the bearing support force versus the current according to the number of turns of the coil according to the present invention.

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

1 is a perspective view of a radial magnetic bearing module according to the present invention, FIG. 2 is an exploded perspective view of a radial magnetic bearing module according to the present invention, and FIG. 3 is a cross-sectional view of a radial magnetic bearing module according to the present invention.

The radial magnetic bearing module 10 according to the present invention is provided on the circumference of a rotating shaft such as a rotor to reduce friction, preferably a hybrid homo-polar type magnetic bearing, preferably a permanent magnet. As a polar type) radial magnetic bearing, as shown in FIGS. 1 to 3 , it is largely composed of a magnetic bearing core 100 , a coil 200 , and a permanent magnet 300 .

The magnetic bearing core 100 is provided in a ring shape with a through hole through which the rotor can penetrate. The through hole is formed to have enough space so that the rotor does not come into contact with the magnetic bearing core 100 even when the rotor is magnetically levitated.

The magnetic bearing core 100 may be configured as a single ring-shaped member, but the first core 110 and the second core 120 each are configured in a ring shape so as to be spaced apart by a predetermined distance along the axial direction of the rotor depending on the usage mode. ) can be composed of The first core 110 and the second core 120 each include a separate first core pole piece 111 and a second core pole piece 121 , and a first core support 112 and a second core support 122 . do.

The first core pole piece 111 is preferably provided in plurality on one side of the inner circumferential surface of the first core 110, preferably provided radially on the inner surface, and more preferably the first core pole piece 111 is provided radially. It is preferable that one or more are provided at equal intervals, and most preferably, the number of coils 200 and the number corresponding to the number of coils 200 are restored so as to be opposite to each other. The coil 200 should be provided inside the first core pole piece 111 so as to protrude to have a predetermined length in the center direction of the first core 110 .

The first core supporter 112 is formed to protrude at least one side of the first core 110 at an inclination angle with the first 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 aspect and the overall shape of the radial magnetic bearing module 10 , but preferably one side of the first core 110 . It is preferable to protrude vertically to the A plurality of the first core support 112 may be provided at equal intervals, preferably a plurality of the first core support 112 is provided to face each other, and more preferably a plurality of the first core pole piece 111 and the corresponding position. It is good to have it available.

In addition, the shape and number of the first core support 112 is not limited, and may be formed in various shapes and numbers in consideration of the user's usage pattern and the like.

In the magnetic bearing core 100 , when the first core 110 and the second core 120 are coupled, the first core support 112 and the second core support 122 are coupled to each other so that they contact each other.

Accordingly, the second core 120 may be configured to face the first core 110 in a shape corresponding to the aforementioned first core 110 . That is, the second core 120 has a second core pole piece 121 and a second core support 122 corresponding to the first core pole piece 111 and the first core support 112 of the first core 110 described above. ) is provided, and a detailed description thereof will be omitted because it has a configuration similar to that of the first core 110 described above.

Depending on the usage mode, the magnetic bearing core 100 may be manufactured as a single magnetic bearing core 100 in which the first core 110 and the second core 120 are manufactured. That is, if manufactured with one magnetic bearing core 100 , the first core support 112 and the second core support 122 are integrally formed to have one core support. As such, when the core support is integrally formed, a groove or a through hole may be formed so that the permanent magnet 300 can be inserted.

The coil 200 may be provided on at least one side of at least one of the first core 110 and the second core 120 , preferably on the inner side of the first core 100 and the second core 120 , etc. It is preferable to be wound on the first core pole piece 111 and the second core pole piece 121 formed at intervals.

The coil 200 is directly wound in a form surrounding the first core pole piece 111 and the second core pole piece 121, or the coil is wound around the coil base using a coil base to form a modularized coil with the first core pole piece (111) and may be provided in a form coupled to the second core pole piece (121).

In addition, the direction in which the coil 200 is wound and the number of windings may be variously wound in consideration of usage patterns and the like.

The permanent magnets 300 are preferably provided in plurality on one side of the magnetic bearing core 100 , like the first core support 111 or the second core support 112 , and more preferably so that they are spaced apart at equal intervals. A plurality is provided, and more preferably a plurality is provided so as to be opposed to a position corresponding to each other, and most preferably a plurality is provided so as to be opposed to a position corresponding to each other in a number corresponding to the number of the coils 200 . In the present invention, the first core support 112 and the second core support 122 will be mainly described in that the permanent magnet 300 is provided between one surface to be coupled to each other.

At this time, the thickness and size of the permanent magnet 300 may be formed in various ways depending on the weight and usage of the rotor, and preferably each of the first core support 112 and the second core support 122 facing each other. It is preferable to have an area corresponding to one surface.

If, depending on the usage, when the first core support 112 and the second core support 122 are integrally formed, they may be provided to be inserted into a groove or a through hole formed on one side of the center.

In order to prepare for collision between the outer peripheral surface of the rotor and the inner peripheral surface of the magnetic bearing core 100 , and to facilitate coupling of the first core 110 and the second core 120 , the first core 110 and the second core 120 . ) may be additionally provided with an alignment unit 400 to easily align the coupling position. The alignment unit 400 is an anchor of the alignment unit 400 in order to be more precisely coupled when the first core 110 and the second core 120 are coupled to each other. A groove corresponding to the first pole piece 111 of the first core 110 and the second pole piece 121 of the second core 120 is formed, and accordingly, the first core 110 and the second core 120 are formed. combine

In addition, the aligning unit 400 may be formed of a mechanical bearing such as a ball bearing in order to not only prevent a collision but also stably rotate the rotor even when the rotor contacts the aligning unit 400 .

For the protection of the magnetic bearing core 100, preferably, a cover 500 may be further provided to prevent an external shock or foreign substances from flowing in, depending on the usage mode. The cover 500 is provided with an outer diameter cover 510 and a bearing cover 520 .

The outer diameter cover 510 may be additionally provided on the outermost portion of any one of both sides of the outer diameter of the magnetic bearing core 100 to protect the outer diameter.

The bearing cover 520 may be additionally provided to surround one side of the outer surface of at least one of the first core 110 and the second core 120 .

The shape of the cover 500 is not limited, and may be formed in any shape as long as it can protect the radial magnetic bearing module 10 from external impact or prevent the inflow of foreign substances.

A sensor unit (not shown) may be further provided to detect the displacement of the rotor.

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

Usage of radial magnetic bearing module

A usage aspect of the radial magnetic bearing module 10 having the above-described configuration will be described in more detail with reference to the drawings. In describing the invention, it is mentioned in advance that parts that are commonly known and not largely related to the invention are not described in order to avoid confusion in describing the invention.

As an embodiment, as shown in FIGS. 1 to 3 , the usage aspect of the radial magnetic bearing module 10 having the ring-shaped magnetic bearing core 100 will be described in detail as follows.

The first core pole piece 111 and the first core support 112 in the present invention are provided to correspond to the second core pole piece 121 and the second core support 122, respectively, so that in the next use aspect, the first core pole piece for convenience (111), it will be described in detail by naming the first core support (112). It is specified that the second core pole piece 121 and the second core support 122, which are not mentioned, have the same usage mode and the like.

In addition, the magnetic bearing core 100 is easy to manufacture by manufacturing the structure of the divided core and the complex-shaped electromagnet module fixing part in a single ring shape, reducing the number of parts, and complicating the core and complex parts divided into plural. The magnetic bearing core 100 in the present invention is manufactured in an integrated structure in a single ring shape so that the precision is lowered when assembling the fixed parts of the electromagnet module of the shape, so that the precision is constant.

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

The coil 200 is coupled to the first core pole piece 111 and the second core pole piece 121 .

At this time, the coil 200 may be directly wound on the first core pole piece 111 and the second core pole piece 121, but the first core pole piece 111 and the second core by winding the coil 200 on the coil base It is preferable to couple to the pole piece (121).

In addition, 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 is wound in the corresponding direction and the number of windings.

Next, a permanent magnet 300 is provided between the first core support 112 and the second core support 122 formed on the first core 110 and the second core 120 to which the coil 200 is coupled. to combine

If the alignment unit 400 is further provided, the second core 120 may be coupled after the alignment unit 400 is first coupled before coupling the second core 120 to the first core 110 . .

At this time, since protrusions into which the first core pole piece 111 and the second core pole piece 121 can be inserted are formed at both ends of the aligning unit 400, it is easier for even a non-professional worker to more easily use the first core 110 And the concentricity of the second core 120 may be coupled to match.

And, when the cover 500 and the sensor unit are further provided, the assembly can be completed by further combining the cover 500 and the sensor unit. The configuration of the cover 500 and the sensor unit is commonly used in the art and a detailed description thereof will be omitted.

When the radial magnetic bearing module 10 according to the present invention combined through the above-described assembly process is used, it can be confirmed that the performance is improved as follows when compared with the conventional magnetic bearing.

4 is a transparent perspective view showing a simulation state for confirming magnetic flux of a radial magnetic bearing module provided in a ring shape according to the present invention, and FIG. 5 is a partially enlarged view of FIG. 4 . When the rotor is inserted into the bearing core 100 having a ring shape of the radial magnetic bearing module 10 according to the present invention, the rotor is floated by the magnetic force of the permanent magnet 300 , and the arrangement state can be maintained. As such, since the permanent magnet 300 provides the bias magnetic flux, separate power for the initial current and bias current for levitating and maintaining the rotor is not consumed.

Thereafter, when the radial displacement of the rotor occurs during rotation of the rotor, the sensor unit detects it and transmits it to the control device, and the control device corrects the radial displacement of the rotor. ) to control the current supplied to That is, as the current of the coil 200 disposed in the direction opposite to the coil 200 to which the rotor is in close contact is increased, the rotor can return to the center through the increased attractive force. A method of controlling the rotor by the magnetic flux generated by the coil 200 is commonly used in the art and a detailed description thereof will be omitted.

The first core 110 and the second core 120 according to the present invention are each manufactured in a ring shape, and thus serve as a connecting passage through which the magnetic flux of the current generated in each coil 200 can move. However, in the conventional magnetic bearing, since the plurality of coil fixing parts are short-circuited, it is not easy to move the magnetic flux generated in each coil. That is, the coil 200 provided in the first core 110 and the second core 120 according to the present invention forms a magnetic flux in the rotor direction, and at the same time, the first core 110 and the second core formed in a ring shape. The magnetic flux may move along the radial direction of 120 .

As a result, the volume of the magnetic body in which magnetic flux is generated increases, so that the bearing capacity of the radial magnetic bearing module 10 is increased. In order to confirm this more clearly, the comparative performance test result will be described in more detail as follows.

6 is a graph showing the relationship between the bearing bearing force versus the current according to the number of turns of the coil of the conventional type, and FIG. 7 is a graph showing the relationship between the bearing bearing force and the current according to the number of turns of the coil according to the present invention.

Here, the horizontal axis represents the amount of current input to the coil 200, and the vertical axis represents the bearing bearing force output accordingly. In addition, each line in the graph indicates the number of turns of the coil 200 .

The force of the coil 200 increases according to the number of turns wound around the first core pole piece 111 or the coil base. In the case of the conventional type, a maximum force of 177N is generated as shown in FIG. 6 , but in the present invention, it can be confirmed that a maximum force of 210N is generated as shown in FIG. 7 .

In addition, it can be seen that the bearing capacity in the low current band in the present invention has a higher increase in the bearing holding force in the low current band of the existing type.

Accordingly, it is possible to maximize the increase in bearing support in the low power band, and it can be seen that the power efficiency is also improved.

Also, in general, when the number of turns is increased, there may be a section in which the power is rather decreased. In the case of the existing type in the section in which the force falls, it can be confirmed that the bearing support force according to the number of turns randomly falls as shown in FIG. 6 , but as shown in FIG. 7 , the bearing support force according to the number of turns of the present invention is constant You can tell it goes up and down.

As a result, in the case of the existing type, it is not possible to accurately determine the maximum bearing capacity section according to the number of turns, but in the present invention, the maximum bearing capacity according to the number of turns can be easily known, so that the number of turns of the coil 200 can be appropriately determined according to the user's usage mode. Can be adjusted.

In the foregoing, it should be construed that changes are possible depending on the usage aspect of the user or administrator as only an example for explaining the present invention and not limiting.

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 is to be understood that the foregoing is 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
100: magnetic bearing core
110: first core
111: first core pole piece
112: first core support
120: second core
121: second core pole piece
122: second core support
200: coil
300: permanent magnet
400: alignment unit
500: cover
510: outer diameter cover
520: bearing cover

Claims (10)

a magnetic bearing core having a ring shape integrally formed to surround the rotor and including first and second cores spaced apart from each other by a predetermined distance along the axial direction of the rotor;
a permanent magnet provided at an outermost portion of the magnetic bearing core; and
A coil provided on one side of the magnetic bearing core:
including,
The first core includes a plurality of first core pole pieces radially formed on the inside and at least one first core support that is formed to protrude at a predetermined angle in a direction facing the second core for connection with the spaced apart second core. including,
The second core includes a plurality of second core pole pieces radially formed therein and a second core support protruding to correspond to the first core support in a direction facing the first core,
The coil is wound on one side of at least one of a first core pole piece of the first core and a second core pole piece of the second core,
The permanent magnet is provided between the first core support and the second core support to connect the first core and the second core,
A radial magnetic bearing module provided around the rotor to reduce friction. delete delete delete delete delete delete delete The method according to claim 1,
The radial magnetic bearing module further comprising an alignment part disposed inside the magnetic bearing core and the coil to help precisely couple the first core and the second core. The method according to claim 1,
The radial magnetic bearing module further comprising a sensor unit installed on one side of the magnetic bearing core to detect the displacement of the rotor.

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