Bearingless motor device provided with magnet-coupled rotor

Abstract

An embodiment of the present invention provides a bearingless motor, in which a permanent magnet is disposed on a rotor in order to improve performance such as suspension force or rotational force and which is stably operated in such a structure. A bearingless motor device provided with a magnet-coupled rotor comprises: a rotor performing a rotation and a buffering function; and a stator provided with multiple tooth parts arranged along the circumferential direction of the rotor, and a winding wire part which is provided with a winding wire formed on one among the multiple tooth parts and levitates or rotates the rotor, wherein the rotor is provided with: an upper suspension magnet which is formed in an upper part of the rotor and is a ring-shaped magnet; a lower suspension magnet which is formed in a lower part of the rotor and is a ring-shaped magnet; and multiple rotation magnets formed between the upper suspension magnet and the lower suspension magnet.

Description

Bearingless motor device having a magnetically coupled rotor

[0001] The present invention relates to a bearingless motor device having a magnetically coupled rotor, and more specifically, to a bearingless motor that operates stably in such a structure by arranging permanent magnets on the rotor to improve performance such as suspension force or rotational force.

[0002]

[0003] As the adoption of electric vehicles accelerates and interest in energy conservation and environmental protection grows, demand for energy-saving, high-efficiency motors is growing. Electric motor systems consist of essential components such as rotors, bearings, stators, windings, and commutators. While bearings allow relative motion between components and reduce friction between moving parts, they are not only a source of friction loss but are also typically the first component to fail in electric motor systems.

[0004] To overcome the shortcomings of mechanical bearings, non-contact assisted motors were developed. Bearingless motors have the advantage of requiring less overall maintenance due to non-contact and frictionless operation and can be applied to extreme environments such as vacuum and ultra-low temperatures.

[0005] Additionally, it has the advantages of higher efficiency, higher power-to-size ratio, faster speed range and lower electrical noise generation, and in particular, it can significantly reduce the size of the motor and has much better thermal characteristics.

[0006] Korean Patent Publication No. 10-2010-0080653 (Title of the Invention: Rotor and stator design method for reducing torque ripple of a concentrated winding synchronous reluctance motor and rotor and stator of a concentrated winding synchronous reluctance motor designed and manufactured by the design method) discloses a rotor and stator design method for reducing torque ripple based on design variables of a concentrated winding synchronous reluctance motor, comprising: a step of initializing a CAD file to design a rotor and a stator for reducing torque ripple; a step of setting the rib width of the rotor to a fixed value, and modeling design data for finite element analysis by selecting a slot opening width, slot depth, tooth width, and flux barrier width on the stator side, which affect torque ripple, as design variables; a step of setting the range of design variables and the number of experiments using the central composite programming method, which is one of the response surface methods, which are statistical approximation methods; A rotor and stator design method for reducing torque ripple of a concentrated winding synchronous reluctance motor is disclosed, which comprises a step of calculating a torque ripple value using a finite element analysis program developed for the design of the rotor and stator of the concentrated winding synchronous reluctance motor.

[0007] <Prior Art Literature>

[0008] Republic of Korea Publication Patent No. 10-2010-0080653

[0009]

[0010] The purpose of the present invention to solve the above problems is to provide a bearingless motor that operates stably in such a structure by arranging permanent magnets on a rotor to improve performance such as suspension force or rotational force.

[0011] The technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0012]

[0013] The present invention for achieving the above object comprises a rotor that performs rotation and buffer functions; and a stator that has a plurality of teeth arranged along the circumferential direction of the rotor, and a winding portion that has a winding formed on one of the plurality of teeth and levitating or rotating the rotor; wherein the rotor is characterized by having an upper suspension magnet that is a ring-shaped magnet formed on an upper portion of the rotor, a lower suspension magnet that is a ring-shaped magnet formed on a lower portion of the rotor, and a plurality of rotating magnets formed between the upper suspension magnet and the lower suspension magnet.

[0014] In an embodiment of the present invention, the polarity of the upper part of the upper suspension magnet and the polarity of the lower part of the lower suspension magnet may be the same.

[0015] In an embodiment of the present invention, among the plurality of rotating magnets arranged along the circumferential direction of the rotor, in two adjacent rotating magnets, the polarity of one rotating magnet facing the outside of the rotor and the polarity of the other rotating magnet may be different from each other.

[0016] In an embodiment of the present invention, the rotor may include a rotation center body formed in a cylindrical shape; and a rotation body formed in a shape protruding outward from a middle portion of the rotation center body and having the plurality of rotation magnets positioned inside.

[0017] In an embodiment of the present invention, the rotor may further include an upper protrusion formed in a shape protruding outwardly from the upper end of the rotation center body; and a lower protrusion formed in a shape protruding outwardly from the lower end of the rotation center body.

[0018] In an embodiment of the present invention, the upper suspension magnet may be formed between the upper protrusion and the rotating body, and the lower suspension magnet may be formed between the lower protrusion and the rotating body.

[0019] In an embodiment of the present invention, the rotating body may have at least one barrier, which is a space in which a rotating magnet is installed inside.

[0020] In an embodiment of the present invention, the rotating magnet may be formed in a rectangular parallelepiped shape.

[0021] In an embodiment of the present invention, the tooth portion may include a tooth support formed in a shape extending in a direction parallel to the rotational axis of the rotor; and a tooth formed in a shape protruding toward the rotor from the upper portion of the tooth support.

[0022] In an embodiment of the present invention, the winding part may include a levitation winding that is coupled to the tooth support and levitating the rotor when electricity is applied; and a rotation winding that is coupled to the tooth support and rotating the rotor when electricity is applied.

[0023] In an embodiment of the present invention, the upper support portion and the lower support portion are formed in a shape surrounding the rotor and are coupled to the teeth; and a main support portion is coupled to the teeth support at a lower portion of the teeth support.

[0024] In an embodiment of the present invention, the rotor may further include a mounting portion formed at the lower portion thereof and mounted on the main support portion when no electricity is applied to the winding portion.

[0025]

[0026] The effect of the present invention according to the above configuration is that, by the structural design of the motor device of the present invention, a higher suspension force (suspension force) can be implemented compared to a bearingless motor of the prior art, and a high rotational force can be implemented with a simple structure.

[0027] And, the effect of the present invention is that by implementing a simple structure as described above, the complexity of the manufacturing process can be reduced, thereby reducing manufacturing costs, etc.

[0028] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

[0029]

[0030] Figure 1 is a schematic diagram of a motor device according to one embodiment of the present invention.

[0031] Figures 2 and 3 are cross-sectional views of a rotor according to one embodiment of the present invention.

[0032] FIG. 4 is a cross-sectional view of a portion of a rotor according to one embodiment of the present invention.

[0033] Figure 5 is a perspective view of a rotor according to one embodiment of the present invention.

[0034] Figure 6 is a schematic diagram of a motor according to one embodiment of the present invention.

[0035] Figures 7 to 9 are schematic diagrams and cross-sectional views of a rotor according to the prior art.

[0036] Figures 10 and 11 are graphs related to suspension force.

[0037] Figure 12 is a schematic cross-sectional diagram of a rotor according to changes in the volume of the rotor barrier.

[0038] Figures 13 to 15 are graphs of the torque characteristics of the motor device according to the barrier volume of the rotor.

[0039] Figure 16 is a schematic cross-sectional diagram of a rotor according to changes in the volume of the rotating magnet.

[0040] Figures 17 to 19 are graphs of the torque characteristics of the motor device according to the volume of the rotor's rotating magnet.

[0041]

[0042] A most preferred embodiment according to the present invention comprises: a rotor that performs rotation and buffer functions; and a stator that has a plurality of teeth arranged along the circumferential direction of the rotor, and a winding portion that has a winding formed on any one of the plurality of teeth and that floats or rotates the rotor; wherein the rotor is characterized by having an upper suspension magnet that is a ring-shaped magnet formed on an upper portion of the rotor, a lower suspension magnet that is a ring-shaped magnet formed on a lower portion of the rotor, and a plurality of rotating magnets formed between the upper suspension magnet and the lower suspension magnet.

[0043]

[0044] Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention can be implemented in various different forms and is therefore not limited to the embodiments described herein. In the drawings, irrelevant parts have been omitted for clarity of description, and similar parts have been designated with similar reference numerals throughout the specification.

[0045] Throughout the specification, when a part is said to be "connected (connected, contacted, or coupled)" to another part, this includes not only cases where it is "directly connected," but also cases where it is "indirectly connected" with another part in between. Furthermore, when a part is said to "include" a component, this does not exclude other components, but rather implies that it may include other components, unless otherwise specifically stated.

[0046] The terminology used herein is merely used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, it should be understood that the terms "comprises" or "has" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0047] Hereinafter, the present invention will be described in detail with reference to the attached drawings.

[0048]

[0049] FIG. 1 is a schematic diagram of a motor device according to an embodiment of the present invention, FIGS. 2 and 3 are cross-sectional views of a rotor (100) according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view of a portion of a rotor (100) according to an embodiment of the present invention.

[0050] Here, FIG. 2 is a cross-sectional view of a plane parallel to the rotational axis of the rotor (100) and passing through the center of the rotor (100), and FIG. 3 is a cross-sectional view of a plane passing through the center of the rotor (100) and the line A-A' of FIG. 2, and is a cross-sectional view of a plane perpendicular to the rotational axis of the rotor (100). And, FIG. 4 is an enlarged cross-sectional view of a portion of the cross-sectional view of FIG. 2 and the cross-sectional view of the tooth (211).

[0051] As shown in FIGS. 1 to 4, the motor device of the present invention includes a rotor (100) that performs rotation and buffering functions; and a stator that has a plurality of teeth (210) arranged along the circumferential direction of the rotor (100), and a winding part (220) that has a winding formed on one of the teeth (210) among the plurality of teeth (210) and that floats or rotates the rotor (100).

[0052] Here, the buffer function may be a suspension function that absorbs vibration or shock.

[0053] And, the rotor (100) may be equipped with an upper suspension magnet (121) which is a ring-shaped magnet formed on the upper portion of the rotor (100), a lower suspension magnet (122) which is a ring-shaped magnet formed on the lower portion of the rotor (100), and a plurality of rotation magnets (110) formed between the upper suspension magnet (121) and the lower suspension magnet (122).

[0054] The rotor (100) may include a rotation center (130); a rotation body (140); an upper protrusion (151); and a lower protrusion (152). Here, the rotation center (130) may be formed in a cylindrical shape, and the rotation center (130) may be formed of a metal such as aluminum having conductivity, and the rotation body (140) may be formed along the circumferential direction on the outer side of the middle portion of the rotation center (130), an upper protrusion (151) may be formed on the upper end of the rotation center (130), and a lower protrusion (152) may be formed on the lower end of the rotation center (130).

[0055] Specifically, the rotating body (140) is formed in a shape that protrudes outward from the middle portion of the rotating center body (130) and a plurality of rotating magnets (110) can be positioned inside. In addition, in order to install the internal rotating magnets (110) of the rotating body (140), the rotating body (140) can be provided with at least four barriers (141), which are spaces in which the rotating magnets (110) are installed inside.

[0056] As shown in FIGS. 2 and 3, the rotating body (140) can be formed in a cylindrical shape, and the inner diameter of the rotating body (140) can correspond to the outer diameter of the rotating center body (130) so that the rotating center body (130) can be formed in a shape that fits into the rotating body (140).

[0057] The barrier (141), which is a flux barrier, is a space-shaped space formed by penetrating the inside of the wall of the rotating body (140), and such a barrier (141) may include a barrier body portion (141a), a first connecting portion (141b), and a second connecting portion (141c).

[0058] The barrier body part (141a) has a shape that penetrates the inside of the wall of the rotating body (140) in a direction parallel to the direction of the rotation axis of the rotor (100). The width of the barrier body part (141a) is formed in a direction parallel to the diameter of the rotating body (140), and the height of the barrier body part (141a) can be formed in a direction parallel to the thickness of the rotating body (140).

[0059] Each of the first connecting portion (141b) and the second connecting portion (141c) is connected to both ends of the barrier body portion (141a) so as to form an angle of 90 degrees or more with both ends of the barrier body portion (141a), and may have an end extending to the vicinity of the circumference of the rotating body (140).

[0060] The interior of the barrier (141) can be filled with air, and by forming the barrier (141) in the rotating body (140) of the rotor (100) in this way, the motor device of the present invention can operate in the manner of a line-driven synchronous reluctance motor (synRM).

[0061]

[0062] The upper protrusion (151) can be formed in a shape that protrudes outward from the upper end of the rotation center (130). In addition, the lower protrusion (152) can be formed in a shape that protrudes outward from the lower end of the rotation center (130).

[0063] Each of the upper protrusion (151) and the lower protrusion (152) has a circular plate shape with an inner hole and an outer diameter, and the inner diameter of the upper protrusion (151) is formed to correspond to the outer diameter of the upper end of the rotation center (130), and the inner diameter of the lower protrusion (152) is formed to correspond to the outer diameter of the lower end of the rotation center (130), so that the upper protrusion (151) is formed to fit into the upper end of the rotation center (130) and the lower protrusion (152) is formed to fit into the rotation center (130), so that the upper protrusion (151) can be formed to protrude outwardly from the upper end of the rotation center (130), and the lower protrusion (152) can be formed to protrude outwardly from the lower end of the rotation center (130).

[0064] The upper suspension magnet (121) may be formed between the upper protrusion (151) and the rotating body (140), and the lower suspension magnet (122) may be formed between the lower protrusion (152) and the rotating body (140). Specifically, with the above configuration, the upper suspension magnet (121) may be easily fixed to the upper portion of the rotating body, and the lower suspension magnet (122) may be easily fixed to the lower portion of the rotating body. Here, each of the upper suspension magnet (121) and the lower suspension magnet (122) may be formed as a permanent magnet.

[0065] The polarity of the upper part of the upper suspension magnet (121) and the polarity of the lower part of the lower suspension magnet (122) may be the same. Specifically, as shown in FIG. 4, the polarity of the upper part of the upper suspension magnet (121) may be formed as N, and the polarity of the lower part of the lower suspension magnet (122) may be formed as N, and accordingly, a bias flux may be formed at each of the upper and lower parts of the rotor (100).

[0066] And, by the magnetic field of the deflection flux and the winding described below, bearingless operation is realized in the rotor (100) and suspension force can be formed in the rotor (100).

[0067] The rotating magnet (110) may be formed in a rectangular parallelepiped shape. Among the plurality of rotating magnets (110) arranged along the circumferential direction of the rotor (100), in two adjacent rotating magnets (110), the polarity of one rotating magnet (110) facing the outside of the rotor (100) and the polarity of the other rotating magnet (110) may be different from each other. Here, the rotating magnet (110) may be formed as a permanent magnet.

[0068] A plurality of barriers (141) of the present invention may be formed inside the rotating body (140), and at this time, each of the plurality of barriers (141) may be arranged along a middle circle formed by a diameter between an outer diameter and an inner diameter inside the rotating body (140), and at this time, one middle circle may be formed inside the rotating body (140).

[0069] And, as a specific example, four barriers (141) can be uniformly arranged, and the rotating magnet (110) can be formed in a rectangular parallelepiped shape as described above to facilitate insertion into such barriers (141). And, when inserted into the barrier (141), the rotating magnet (110) can be arranged so that the thickness surface of the rotating magnet (110) faces upward or downward.

[0070] In addition, the outer polarity of the rotating magnet (110) inserted into one barrier (141) may be different from the outer polarity of the rotating magnet (110) inserted into each of the barriers (141) located on both sides of one barrier (141). (Here, the outer side means the outer direction of the rotor (100), and the inner side means the inner direction of the rotor (100).)

[0071] That is, when the outer polarity of the rotating magnet (110) in one barrier (141) is the N pole, the outer polarity of the rotating magnet (110) inserted in each of the two barriers (141) located on both sides of one barrier (141) may be the S pole. Accordingly, a rotational force may be formed in the rotor (100) by the flux barrier by the barrier (141), the magnetic field in the rotor (100), and the magnetic field of the rotating winding described below.

[0072]

[0073] The stator may have a plurality of teeth (210) and a plurality of winding parts (220). Here, the teeth (210) may have a teeth support (212) formed in a shape extending in a direction parallel to the rotational axis of the rotor (100); and teeth (211) formed in a shape protruding from the upper portion of the teeth support (212) toward the rotor (100).

[0074] The teeth support (212) can be formed in the shape of a bar, and the teeth portion (210) can have an 'ㄱ' shape by teeth (211) extending from the top of the teeth support (212) toward the rotor (100).

[0075] The winding section (220) may include a levitation winding that levitates the rotor (100) when electricity is applied as a winding coupled to the tooth support (212); and a rotation winding (221) that rotates the rotor (100) when electricity is applied as a winding coupled to the tooth support (212).

[0076] At this time, the wound winding and the rotating winding (221) can each be formed by winding a conductive coil on the tooth support (212), and the rotating winding (221) can be formed on the upper part of the tooth support (212) and the wound winding can be formed on the lower part of the rotating winding (221).

[0077] At this time, a second floating phase winding (222b) may be formed at the bottom of the rotating winding (221) as a floating phase winding, and a first floating phase winding (222a) may be formed at the bottom of the second floating phase winding (222b). In this way, a three-phase system may be formed, and the number of coil turns of the first floating phase winding (222a) and the number of coil turns of the second floating phase winding (222b) may be the same or different, and the coils of each of the first floating phase winding (222a) and the second floating phase winding (222b) may be connected in series with each other.

[0078] The motor device of the present invention may further include an upper support portion (310) and a lower support portion (320) formed in a shape surrounding the rotor (100) and coupled with the teeth (211); and a main support portion (330) coupled with the teeth support portion (212) at the lower portion of the teeth support portion (212).

[0079] Each of the upper support portion (310) formed on the upper side of the tooth (211) and the lower support portion (320) formed on the lower side of the tooth (211) is formed in the shape of a ring, and each of the plurality of teeth (211) is arranged along the circumferential direction of the upper support portion (310) and the lower support portion (320), so that each of the plurality of teeth (211) is coupled to the upper support portion (310) and the lower support portion (320), so that the tooth portion (210) can be fixed by the upper support portion (310) and the lower support portion (320).

[0080] In addition, as shown in Fig. 4, in the cross-sections of the upper support portion (310) and the lower support portion (320), an upper protrusion (311) protruding from the upper portion of the upper support portion (310) toward the upper protrusion (151) may be formed on the upper portion of the upper support portion (310). In addition, a lower protrusion (321) protruding from the lower portion of the lower support portion (320) toward the lower protrusion (152) may be formed on the lower portion of the lower support portion (320).

[0081] In addition, the main support part (330) is also formed in the shape of a ring including a polygonal cross-section, and the lower ends of the plurality of tooth supports (212) are arranged along the circumferential direction of the main support part (330) and are combined with the main support part (330), so that the lower part of the tooth part (210) can be fixed by the main support part (330).

[0082] The motor device of the present invention may further include a mounting portion (410) formed at the lower portion of the rotor (100) and mounted on the main support portion (330) when no electricity is applied to the winding portion (220). The upper portion of the mounting portion (410) is coupled with the lower portion of the rotation center body (130) and the lower protrusion (152), and a protrusion portion may be formed at the lower portion of the mounting portion (410) so as to be coupled to the perforated portion of the main support portion (330).

[0083] When electricity is applied to the wound winding, a suspension force is provided to the rotor (100) by the magnetic field of the wound winding, and accordingly, the mounting portion (410) may also be affected by the suspension force.

[0084] An upper base (421) formed along the outer circumferential direction of the upper portion of the plurality of teeth (210) and coupled with the upper portion of the plurality of teeth (210) may be formed on the upper portion of the plurality of teeth (210), and a lower base (422) formed along the outer circumferential direction of the lower portion of the plurality of teeth (210) and coupled with the lower portion of the plurality of teeth (210) may be formed on the lower portion of the plurality of teeth (210).

[0085] Each of the upper base (421) and the lower base (422) can be formed in the shape of a ring including a polygonal cross-section, and the upper portion of a plurality of teeth (210) is coupled to the inner portion of the upper base (421), and the lower portion of a plurality of teeth (210) is coupled to the inner portion of the lower base (422), so that the fixing force for the teeth (210) can be increased.

[0086] When a rotating magnetic field is formed by the rotating winding (221) of the stator, a flux barrier is formed in the barrier (141) by the rotating magnetic field, thereby generating a rotational force. In addition, a rotational force is formed in the rotating magnet (110) by the rotating magnetic field, thereby allowing the rotor (100) to rotate. Accordingly, even if the number of barriers (141) in the present invention is small, the rotational force can be increased by the rotating magnet (110).

[0087] And, as described above, the rotor (100) is positioned in a rotation space, which is a space between a plurality of teeth (211), by the levitation winding, and the rotor (100) rotates at a predetermined interval from the plurality of teeth (211) by providing a suspension force by the magnetic field of the levitation winding in the rotation space, thereby implementing a bearingless motor.

[0088] By the structural design of the motor device of the present invention as described above, a higher suspension force (suspension force) can be achieved compared to a bearingless motor of the prior art, and a high rotational force can be achieved with a simple structure.

[0089] And, by implementing a simple structure as described above, the complexity of the manufacturing process can be reduced, thereby reducing manufacturing costs, etc.

[0090]

[0091] Fig. 5 is a perspective view of a rotor (100) according to an embodiment of the present invention, and Fig. 6 is a schematic diagram of a motor according to an embodiment of the present invention, in which a rotor (100) and a stator are represented. Each of Figs. 5 and 6 may be implemented as a modeling, such as the following [Example], using software to perform a simulation of the motor device of the present invention.

[0092] [Example]

[0093] As shown in FIGS. 5 and 6, the motor device of the present invention can be modeled using Ansys Maxwell software. At this time, for modeling, the teeth (210) are formed into 12 pieces, and a rotating winding (221), a first phase winding (222a), and a second phase winding (222b) are formed on each teeth (210).

[0094] At this time, the number of coil turns in the first phase winding (222a) was set to 81 and the number of coil turns in the second phase winding (222b) was set to 30, and since the rotating magnet (110), which is a permanent magnet, is installed in the rotor (100), a higher grade N45 permanent magnet was set to be used as the rotating magnet (110), and modeling of the motor device of the present invention was performed.

[0095]

[0096] FIGS. 7 to 9 are schematic diagrams and cross-sectional views of a rotor (510) of a motor device according to the prior art. Specifically, FIG. 7 is a cross-sectional view of a plane parallel to the rotational axis of the rotor (510) and passing through the center of the rotor (510) in the motor device according to the prior art, and FIG. 8 is a cross-sectional view of a plane perpendicular to the rotational axis of the rotor (510) along the line B-B' of FIG. 7. In addition, FIG. 8 is an enlarged cross-sectional view of a part of the cross-sectional view of FIG. 7 and the cross-sectional view of the teeth (211).

[0097] As shown in FIGS. 7 to 9, the motor device according to the prior art has an upper groove (511) and a lower groove (512), which are ring-shaped grooves, formed on the upper and lower portions of a cylindrical rotor (510), and four central grooves (513), which are grooves formed on the outer surface, are formed in the central portion corresponding to the rotating body (140) of the present invention, and the four central grooves (513) can be uniformly arranged.

[0098] In addition, as shown in Fig. 9, Halbach magnets (520) may be installed on the upper and lower portions of the teeth (211), respectively. In addition, the remaining components, excluding the rotor (510) and Halbach magnets (520), may be formed by the stator, main support portion (330), mounting portion (410), upper base (421), and lower base (422) of the present invention.

[0099] [Comparison Example]

[0100] As shown in FIGS. 7 to 9, a conventional motor device can also be modeled using Ansys Maxwell software. At this time, for modeling, 12 tooth sections (210) are formed, and a rotating winding (221), a first phase winding (222a), and a second phase winding (222b) are formed on each tooth section (210).

[0101] At this time, the number of coil turns in the first phase winding (222a) was set to 81 and the number of coil turns in the second phase winding (222b) was set to 30, and since the rotating magnet (110), which is a permanent magnet, is installed in the rotor (100), a higher grade N45 permanent magnet was set to be used as the rotating magnet (110), and modeling of the motor device of the present invention was performed.

[0102] Here, the outer diameter of the rotating body (140) and the outer diameter of the rotor (510) may be the same.

[0103]

[0104] An analysis was performed on the following result values ​​while changing the design values ​​of the motor device of the present invention according to [Example]. In addition, a comparison was also performed with each result value related to the motor device according to [Comparative Example].

[0105] Figures 10 and 11 are graphs related to suspension force. Specifically, Figure 10 is a graph of the size of suspension force formation according to the inner diameter (ID) - outer diameter (OD) of each of the upper suspension magnet (121) and the lower suspension magnet (122), and Figure 11 displays each graph according to the outer diameter of each of the upper suspension magnet (121) and the lower suspension magnet (122) and the number of rotating magnets (110), and by analyzing the suspension force when the rotor (100) moves from the center position, each graph shows the change in suspension force according to the takeoff of the rotor (100).

[0106] Here, the center position may be the center position of the motor modeled as above.

[0107] In each of FIGS. 10 and 11, the vertical axis represents the suspension force (N), and the horizontal axis represents the suspension magneto-motive force (MMF) magnitude (At).

[0108] In Fig. 10, ID may refer to the inner diameter (ID) of each of the upper suspension magnet (121) and the lower suspension magnet (122), and OD may refer to the outer diameter (OD) of each of the upper suspension magnet (121) and the lower suspension magnet (122). (The thickness of each suspension magnet is the same, unit mm) All graphs except the Ref model are graphs analyzed while changing the ID-OD in the motor device of [Example]. And, the Ref model is for the motor device of the prior art by [Comparative Example]. (Hereinafter, the same)

[0109] In Fig. 11, D represents the outer diameter of each of the upper suspension magnet (121) and the lower suspension magnet (122), and the number following '-' may represent the distance (mm) from the center position to which the rotor (100) has moved. Specifically, D44-08 may represent that in the motor device according to [Example], the outer diameter of each suspension magnet is 44 mm and the rotor (100) is moved to a position at a distance of 08 mm from the center position of the modeled motor.

[0110] And, Ref-08 can indicate that in the motor device according to [Comparative Example], the rotor (510) is moved to a position 8 mm away from the center position.

[0111] As shown in Fig. 10, it can be confirmed that excellent suspension force is formed when the outer diameter of each suspension magnet is 44 mm, and at the same time, it can be confirmed that excellent suspension force is formed when the motor device of the present invention is used.

[0112] And, as seen in Fig. 11, when using a suspension magnet as in the motor device of the present invention, it can be confirmed that the suspension force becomes 0 due to the suspension magneto-motive force (Suspension MMF (Magneto-Motive Force), At), and accordingly, it can be confirmed that the suspension force is sufficient to levitate the rotor (100) so that it deviates from the center by up to 0.6 mm.

[0113]

[0114] Fig. 12 is a cross-sectional schematic diagram of a rotor (100) according to changes in the volume of the barrier (141) of the rotor (100), and Figs. 13 to 15 are graphs of the torque characteristics of the motor device according to the volume of the barrier (141) of the rotor (100).

[0115] Here, in the case where the outer diameter of the rotating body (140) is 50 mm and the inner diameter is 30 mm, (a) of Fig. 12 is for the case where the distance between the outer end of the first connecting portion (141b) and the outer end of the second connecting portion (141c) in the barrier (141) is 14 mm. At this time, the inner direction of each connecting portion is a direction toward the barrier body (141a), and the outer direction is a direction opposite to the inner direction.

[0116] In addition, (b) of FIG. 12 is for the case where the distance between the outer end of the first connecting portion (141b) and the outer end of the second connecting portion (141c) is 16 mm, (c) of FIG. 12 is for the case where the distance between the outer end of the first connecting portion (141b) and the outer end of the second connecting portion (141c) is 18 mm, and (d) of FIG. 12 is for the case where the distance between the outer end of the first connecting portion (141b) and the outer end of the second connecting portion (141c) is 20 mm.

[0117] In addition, Fig. 13 is a graph of torque change during rotation of the rotor (100), in which the vertical axis represents torque (mN*m) and the horizontal axis represents the rotation angle (Angle, deg) of the rotor (100). Here, ref is for the motor device according to [Comparative Example], and each 'y number' represents the distance between the outer end of the first connecting portion (141b) and the outer end of the second connecting portion (141c). That is, y14 represents that the distance between the outer end of the first connecting portion (141b) and the outer end of the second connecting portion (141c) is 14 mm.

[0118] In addition, Fig. 14 is a graph for fundamental torque, in which the vertical axis in Fig. 14 is for torque (mN*m) and the horizontal axis is for the distance (ddy) between the outer end of the first connecting portion (141b) and the outer end of the second connecting portion (141c) in the rotor (100) and the motor device (RefModel) according to [Comparative Example].

[0119] And, Fig. 15 is a graph for normalized harmonics, in which the vertical axis in Fig. 15 is for normalized harmonics and the horizontal axis is for the distance (ddy) between the outer end of the first connection part (141b) and the outer end of the second connection part (141c) in the rotor (100) and the motor device (RefModel) according to [Comparative Example].

[0120] As shown in FIGS. 13 to 15, it can be confirmed that the largest fundamental torque and the lowest normalized harmonic are achieved when the distance between the outer end of the first connecting portion (141b) and the outer end of the second connecting portion (141c) is 14 mm, and compared to the motor device of the prior art [Comparative Example], the torque in the motor device of the present invention increases by 5.25% and the harmonic is reduced by 28.57%, confirming that the performance of the motor device of the present invention according to the [Embodiment] is superior.

[0121]

[0122] Fig. 16 is a cross-sectional schematic diagram of a rotor (100) according to the change in the volume of the rotating magnet (110), and Figs. 17 to 19 are graphs of the torque characteristics of a motor device according to the volume of the rotating magnet (110) of the rotor (100).

[0123] Here, in the case where the outer diameter of the rotating body (140) is 50 mm, the inner diameter is 30 mm, and the distance between the outer end of the first connecting portion (141b) and the outer end of the second connecting portion (141c) in the barrier (141) is 14 mm, (a) of FIG. 16 is for the case where there is no rotating magnet (110), (b) of FIG. 16 is for the case where the width of the rotating magnet (110) is 12 mm, (c) of FIG. 16 is for the case where the width of the rotating magnet (110) is 8 mm, and (d) of FIG. 16 is for the case where the width of the rotating magnet (110) is 4 mm.

[0124] In addition, Fig. 17 is a graph of the torque change during rotation of the rotor (100), in which the vertical axis in Fig. 17 represents the torque (mN*m) and the horizontal axis represents the rotation angle (Angle, deg) of the rotor (100). Here, ref represents the motor device according to [Comparative Example], w / o PM represents the absence of the rotating magnet (110), which is a permanent magnet (PM), PM_S4 represents the case where the width of the rotating magnet (110) is 4 mm, PM_S8 represents the case where the width of the rotating magnet (110) is 8 mm, and PM_S12 represents the case where the width of the rotating magnet (110) is 12 mm.

[0125] Also, Fig. 18 is a graph for fundamental torque, and the vertical axis in Fig. 18 is for torque (mN*m). Also, Fig. 19 is a graph for normalized harmonic, and the vertical axis in Fig. 19 is for normalized harmonic.

[0126] And, in the horizontal axis of FIGS. 18 and 19, (Ref) is for the motor device according to [Comparative Example], (A) is for the case of (a) of FIG. 16, (D) is for the case of (b) of FIG. 16, (C) is for the case of (c) of FIG. 16, and (B) is for the case of (d) of FIG. 16.

[0127] As shown in Figures 16 to 19, it can be confirmed that the highest fundamental torque value appears in case (D) and the second lowest normalized harmonic is achieved. The lowest normalized harmonic is achieved in case (B), but it can be confirmed that the difference from the normalized harmonic of (D) is not large.

[0128] In this way, when the barrier (141) and the rotating magnet (110) are simultaneously provided, it can be confirmed that the torque of the motor device increases, and it can be confirmed that low normalized harmonics are implemented. Specifically, compared to the motor device according to [Comparative Example], it can be confirmed that in the motor device according to [Example], the torque increases by 48% in case of (B), and by 88% in case of (C).

[0129]

[0130] The foregoing description of the present invention is provided for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, components described as being single may be implemented in a distributed manner, and similarly, components described as being distributed may be implemented in a combined manner.

[0131] The scope of the present invention is indicated by the claims described below, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

[0132] <Explanation of symbols>

[0133] 100: Rotor 110: Rotating magnet

[0134] 121: Upper suspension magnet 122: Lower suspension magnet

[0135] 130: Rotating center 140: Rotating body

[0136] 141: Barrier 141a: Barrier body

[0137] 141b: First connection 141c: Second connection

[0138] 151: Upper protrusion 152: Lower protrusion

[0139] 210: Teesbu 211: Tees

[0140] 212: Teeth support 220: Winding part

[0141] 221: Rotating winding 222a: First phase winding

[0142] 222b: Second upper winding 310: Upper support

[0143] 311: Upper protrusion 320: Lower support

[0144] 321: Lower lateral protrusion 330: Main branch

[0145] 410: Fixing part 421: Upper base

[0146] 422: Lower base 510: Rotor

[0147] 511: Upper groove 512: Lower groove

[0148] 513: Central Home 520: Halbach Magnet

Claims

1. A rotor that performs rotation and buffering functions; and A stator including a plurality of teeth arranged along the circumferential direction of the rotor, and a winding formed on one of the plurality of teeth and configured to float or rotate the rotor; A bearingless motor device having a magnet-coupled rotor, characterized in that the rotor comprises an upper suspension magnet, which is a ring-shaped magnet formed on an upper portion of the rotor, a lower suspension magnet, which is a ring-shaped magnet formed on a lower portion of the rotor, and a plurality of rotating magnets formed between the upper suspension magnet and the lower suspension magnet.

2. In claim 1, A bearingless motor device having a magnetic coupling rotor, characterized in that the polarity of the upper part of the upper suspension magnet and the polarity of the lower part of the lower suspension magnet are the same.

3. In claim 1, A bearingless motor device having a magnetic coupling rotor, characterized in that among the plurality of rotating magnets arranged along the circumferential direction of the rotor, the polarity of one rotating magnet facing the outside of the rotor and the polarity of the other rotating magnet are different from each other.

4. In claim 1, The above rotor, A center of rotation formed in a cylindrical shape; and A bearingless motor device having a magnetic coupling rotor, characterized in that it comprises a rotating body formed in a shape that protrudes outwardly from the middle portion of the rotating center body and has a plurality of rotating magnets positioned inside.

5. In claim 4, The above rotor, An upper protrusion formed in a shape that protrudes outward from the upper end of the center of rotation; and A bearingless motor device having a magnetic coupling rotor, characterized in that it further comprises a lower protrusion formed in a shape that protrudes outwardly from the lower end of the rotation center body.

6. In claim 5, A bearingless motor device having a magnet coupling rotor, characterized in that the upper suspension magnet is formed between the upper protrusion and the rotating body, and the lower suspension magnet is formed between the lower protrusion and the rotating body.

7. In claim 4, A bearingless motor device having a magnetic coupling rotor, characterized in that the above rotating body has at least one barrier, which is a space in which a rotating magnet is installed inside.

8. In claim 7, A bearingless motor device having a magnetic coupling rotor, characterized in that the above-mentioned rotating magnet is formed in a rectangular parallelepiped shape.

9. In claim 1, The above teeth part, A tooth support formed in a shape extending in a direction parallel to the rotational axis of the rotor; and A bearingless motor device having a magnetic coupling rotor, characterized in that it has a tooth formed in a shape protruding from the upper portion of the tooth support toward the rotor.

10. In claim 9, The above winding part, A levitation winding that levitating the rotor when electricity is applied as a winding connected to the above-mentioned teeth support; and A bearingless motor device having a magnetically coupled rotor, characterized in that it comprises a rotating winding coupled to the above-mentioned teeth support, which rotates the rotor when electricity is applied.

11. In claim 9, An upper support part and a lower support part formed in a shape surrounding the rotor and coupled with the teeth; and A bearingless motor device having a magnetic coupling rotor, characterized in that it further includes a main support portion coupled with the tooth support portion at a lower portion of the tooth support portion.

12. In claim 11, A bearingless motor device having a magnetic coupling rotor, characterized in that it further includes a mounting portion formed at the lower portion of the rotor and mounted on the main support portion when no electricity is applied to the winding portion.

Images