Rotor and motor comprising the same

Abstract

Embodiments disclose a motor including a stator, a rotor disposed corresponding to the stator, and a shaft coupled to the rotor. The rotor includes a rotor core coupled to the shaft, a plurality of magnets disposed at an outer side of the rotor core, and a can disposed to cover the rotor core and the magnets. The can includes a base, a body extending from the base in an axial direction, and a plurality of extension portions extending from an end portion of the body, wherein a radius R2 from a center C to the extension portions is longer than a radius R1 from the center C to the body with reference to a radial direction. Accordingly, the motor can easily guide insertion of the magnets by using the can having two regions with different radii, thereby simplifying a manufacturing process of the motor and improving productivity of the motor.

Description

Technical Field

[0001] The present invention relates to a rotor and a motor including the rotor. Background Technology

[0002] A motor is a device constructed to convert electrical energy into mechanical energy to obtain rotational force, and it is widely used in vehicles, household appliances, industrial machinery, and more. In particular, motors can be used in devices that ensure the steering stability of vehicles. For example, motors can be used in vehicles, such as in electronic power steering (EPS) systems.

[0003] A motor may include a housing, a shaft, a stator disposed on the inner circumferential surface of the housing, and a rotor disposed on the outer circumferential surface of the shaft. In this case, the stator causes an electrical interaction with the rotor to cause the rotor to rotate.

[0004] A rotor may include a rotor core and a plurality of magnets disposed on the rotor core. Depending on the location of the magnets, a rotor may be classified as an internal permanent magnet (IPM) rotor in which the magnets are disposed in the rotor core or a surface permanent magnet (SPM) rotor in which the magnets are attached to the surface of the rotor core.

[0005] In the case of an SPM-type rotor, due to its structural features, the magnet is attached to the rotor core using an adhesive component. Alternatively, a can-shaped component can be used to improve the durability of the magnet and rotor core assembly.

[0006] The can-shaped component not only protects the rotor but also prevents the magnets from separating. In this case, an adhesive component can be applied to the inside of the can-shaped component to secure it to the rotor core on which the magnets are mounted.

[0007] However, there is a problem that the number of processes increases due to the use of two coating processes (a bonding process for connecting the rotor core to the magnet and a bonding process for applying the adhesive components to the inside of the can).

[0008] In this situation, the presence of multiple magnets increases production time due to the magnet assembly process. Furthermore, during can assembly, manual assembly by operators, which is difficult to automate based on the can's structure, increases manufacturing time. These issues also contribute to reduced motor productivity.

[0009] Therefore, there is a need for a rotor that automates assembly and increases productivity, as well as a motor incorporating the rotor. Additionally, there is a need for a rotor core that increases productivity by eliminating the magnet assembly process of the motor and also prevents magnet separation, as well as a motor incorporating the rotor core. Summary of the Invention

[0010] Technical issues

[0011] The present invention aims to provide a rotor and a motor including the rotor, which eliminates the bonding process applied to the magnet by using the connection between the rotor core and the can-shaped component, and wherein separation of the magnet from the rotor core is prevented.

[0012] The present invention aims to provide a rotor core and a motor including the rotor core, wherein separation of magnets is prevented without the need to perform a coupling process.

[0013] The objectives to be addressed by the implementation methods are not limited to those described above, and those skilled in the art will clearly understand from the following description that objectives not described above are not explicitly stated.

[0014] Technical solution

[0015] One aspect of the present invention provides a motor including a stator, a rotor configured to correspond to the stator, and a shaft connected to the rotor, wherein the rotor includes a rotor core connected to the shaft, a plurality of magnets disposed on an outer portion of the rotor core, and a can-shaped member configured to cover the rotor core and the magnets. The can-shaped member includes a base, a body extending axially from the base, and a plurality of extensions extending from an end portion of the body. Each extension includes a first region spaced radially from each of the magnets and a second region extending from the first region. In the radial direction, the radius (R2) from the center (C) to the first region is greater than the radius (R1) from the center (C) to the body.

[0016] The end portion of the body can be positioned at a level lower than the upper surface of the magnet, and the second region can cover the upper surface of the magnet. For example, the second region, i.e., the upper portion of the extension, can be bent to cover the upper surface of the magnet, and the lower end of the first region, i.e., the lower portion of the extension, can be positioned at a level lower than the upper surface of the magnet.

[0017] Alternatively, the end portion of the body can be positioned at the same level as the upper surface of the magnet, and the second region can cover the upper surface of the magnet. For example, the second region, i.e., the upper portion of the extension, can be bent to cover the upper surface of the magnet, and the lower end of the first region, i.e., the lower portion of the extension, can be positioned at the same level as the upper surface of the magnet.

[0018] Additionally, the rotor may include an adhesive component disposed between the upper surface of the magnet and the extension portion.

[0019] The length (d1) of the magnet in the axial direction can be greater than the length (d2) of the rotor core in the axial direction.

[0020] The second region may include a stepped portion, and the second region may contact the upper surface of the rotor core.

[0021] Steps can be formed by caulking.

[0022] The base may include a protruding portion that extends in the axial direction, and the protruding portion may be connected to a hole in the rotor core.

[0023] Since the multiple extensions are spaced apart from each other in the circumferential direction, gaps can be formed between the extensions, and the gaps can be arranged to overlap with guides that protrude radially from the outer peripheral surface of the rotor core.

[0024] Another aspect of the present invention provides a motor including a stator, a rotor configured to correspond to the stator, and a shaft connected to the rotor. The rotor includes a rotor core connected to the shaft, a plurality of magnets disposed on an outer portion of the rotor core, and a can-shaped member configured to cover the rotor core and the magnets. The can-shaped member includes a base, a body extending axially from the base, and a plurality of extension portions extending from an end portion of the body. The base includes a protruding portion projecting axially, the protruding portion connecting to a hole in the rotor core, and the body being spaced apart from the rotor core.

[0025] Another aspect of the present invention provides a motor including a rotor core, a plurality of magnets disposed on an outer portion of the rotor core, and a can-shaped member disposed to cover the magnets and the rotor core, wherein the can-shaped member includes a base, a body extending axially from the base, and a plurality of extension portions extending from an end portion of the body, and in the radial direction, the radius (R2) from the center (C) to the extension portions is greater than the radius (R1) from the center (C) to the body.

[0026] The rotor core can be inserted into the can-shaped part, and the hole in the rotor core can be connected to a protrusion that protrudes from the body in the axial direction.

[0027] When the magnet is inserted between the rotor core and the canister, the magnet can be guided by a guide portion that protrudes radially from the outer peripheral surface of the rotor core.

[0028] Another aspect of the present invention provides a motor including a stator, a rotor disposed inside the stator, and a shaft connected to the rotor, wherein the rotor includes a rotor core and a magnet disposed on an outer portion of the rotor core, the rotor core including a body, a protrusion formed to project radially from the body, and a protrusion formed to project circumferentially from the protrusion, the protrusion including a first protrusion and a second protrusion, the first protrusion being configured to contact a first surface disposed on the outer portion of the magnet, and the second protrusion being configured to contact a second surface of the magnet in the circumferential direction.

[0029] When the magnet is inserted into the rotor core, a portion of the magnet can be positioned radially between the first protrusion and the outer surface of the body, and the second protrusion can be bent axially to contact the second surface of the magnet in the circumferential direction.

[0030] The protruding portion may include a first protruding portion and a second protruding portion, the first protruding portion being disposed on the first protruding portion and the second protruding portion being disposed on the second protruding portion, and the width (W1) of the first protruding portion in the circumferential direction may be greater than the width (W2) of the second protruding portion in the circumferential direction.

[0031] The second protruding portion can be configured to be spaced apart from the second surface of the magnet in the circumferential direction.

[0032] A portion of the second protrusion may be configured to overlap with the first protrusion in the axial direction.

[0033] The first protrusion may include a hole formed to pass through the first protrusion in an axial direction.

[0034] Another aspect of the present invention provides a motor including a stator, a rotor disposed inside the stator, and a shaft connected to the rotor. The rotor includes a rotor core and a magnet disposed on an outer portion of the rotor core. The rotor core is formed by stacking a plurality of plates, the plates including a first plate and a second plate. Each of the first plates includes a first plate body, a first protrusion extending radially from the first plate body, and a first protrusion extending circumferentially from an end portion of the first protrusion. Each of the second plates includes a second plate body, a second protrusion extending radially from the second plate body, and a second protrusion extending circumferentially from an end portion of the second protrusion. When the magnet is inserted into the rotor core, a portion of the magnet is disposed radially between the first protrusion and the outer surface of the body, and the second protrusion is bent axially to contact a second surface of the magnet in the circumferential direction.

[0035] The width (W1) of the first protruding part in the circumferential direction can be greater than the width (W2) of the second protruding part in the circumferential direction.

[0036] The second protruding portion can be configured to be spaced apart from the second surface of the magnet in the circumferential direction.

[0037] A portion of the second protrusion may be configured to overlap with the first protrusion in the axial direction.

[0038] The first protrusion may include a hole formed to pass through the protrusion in an axial direction.

[0039] The second plate can be disposed between the first plates. In this case, the plate may include a third plate, which is disposed between or between the first and second plates. The third plate may include a third plate body and a third protruding portion protruding radially from the third plate body, and the third protruding portion may be formed in the same shape as the second protruding portion. In addition, a plurality of second plates may be disposed axially spaced apart from each other by the first and third plates, and the spacing distance (D2) between the second plates may be greater than or equal to the protruding length (L2) of the second protruding portion in the circumferential direction.

[0040] The end portions of the second protrusions, which are positioned to face each other in the circumferential direction, can be formed with a predetermined gap (G). In this case, the protruding length (L2) of the second protrusion in the circumferential direction can be greater than the thickness (t) of each plate in the plate.

[0041] Another aspect of the invention provides a rotor comprising a rotor core and a magnet inserted into and connected to the rotor core in an axial direction, wherein the rotor core is formed by stacking a plurality of plates, the plates including a first plate and a second plate, each of the first plates including a first plate body, a first protrusion extending radially from the first plate body and a first protrusion extending circumferentially from an end portion of the first protrusion, each of the second plates including a second plate body including a second plate body, a second protrusion extending radially from the second plate body and a second protrusion extending circumferentially from an end portion of the second protrusion, and when the magnet is inserted into the rotor core, a portion of the magnet is disposed radially between the first protrusion and the outer surface of the body, and the second protrusion is bent axially to contact a second surface of the magnet in the circumferential direction.

[0042] A portion of the second protrusion may be configured to overlap with the first protrusion in the axial direction.

[0043] The board may also include a third board, which is disposed between the first board and the second board or between the second boards.

[0044] The third plate may include a third plate body and a third protruding portion projecting radially from the third plate body, and the third protruding portion may be formed in the same shape as the second protruding portion. In this case, the rotor core may include a plurality of second plates arranged to be spaced apart from each other in the axial direction, and the spacing distance (D2) between the second plates may be greater than or equal to the length (L2) of the second protruding portion in the circumferential direction.

[0045] Beneficial effects

[0046] According to the embodiment, by using a can-shaped component with a widened inlet and an arrangement in which the rotor core is inserted into and connected to the can-shaped component, the conventional bonding process performed on the magnet can be eliminated, and rotor manufacturing can be automated. That is, the insertion of the magnet can be easily guided using a can-shaped component with two regions of different radii. Therefore, the motor manufacturing process can be simplified to improve productivity.

[0047] In addition, the separation of the magnets can be prevented by bending the extension formed on the can into a pair of magnets disposed between the rotor core and the can.

[0048] According to the embodiment, the magnet can be prevented from separating by using a protrusion that protrudes from the rotor core to support the magnet. In particular, the magnet can be supported by the elastic restoring force of the protrusion that bends during the insertion of the magnet into the rotor core.

[0049] Furthermore, since the magnet can be supported using only the protrusions, the bonding process for attaching the magnet to the rotor core can be eliminated. Therefore, the motor's productivity can be improved.

[0050] The various useful advantages and effects of the implementation methods are not limited to those described above, and can be readily understood in the description of specific implementation methods. Attached Figure Description

[0051] Figure 1 This is a view illustrating a motor according to an embodiment.

[0052] Figure 2 It is a perspective view of the rotor and shaft according to an embodiment.

[0053] Figure 3 This is a perspective view of a rotor according to an embodiment.

[0054] Figure 4 This is a plan view of a rotor according to an embodiment.

[0055] Figure 5 The diagram illustrates a cross-sectional view of the rotor according to an embodiment.

[0056] Figure 6 It's a diagram. Figure 5 A magnified view of region A.

[0057] Figure 7 It is a perspective view illustrating the arrangement of the rotor core and magnets of a rotor according to an embodiment.

[0058] Figure 8 This is a view illustrating the rotor core of a rotor according to an embodiment.

[0059] Figure 9 This is a set of views illustrating the process of manufacturing a can-shaped component of a rotor according to an embodiment.

[0060] Figures 10a to 10d A view illustrating the process of manufacturing a rotor according to an embodiment is shown, wherein, Figure 10a This is an exploded perspective view illustrating the connection between the bore in the rotor core and the protruding portion of the can-shaped component. Figure 10b The diagram shows an exploded perspective view of the connecting magnets with the rotor core and the can-shaped component connected. Figure 10c It is a three-dimensional diagram illustrating the connection of the magnets with the rotor core and the can-shaped component connected. Figure 10d This is a view illustrating the process of bending the extension of a can-shaped component.

[0061] Figure 11 This is a perspective view illustrating another example of the rotor of a motor according to an embodiment.

[0062] Figure 12 This is a front view illustrating another example of the rotor of a motor according to an embodiment.

[0063] Figure 13 This is a plan view illustrating another example of the rotor of a motor according to an embodiment.

[0064] Figure 14 This is a view illustrating the connection relationship between the magnet and the rotor core of another example of a rotor disposed in a motor according to an embodiment.

[0065] Figure 15 This is a perspective view of a rotor core, illustrating another example of a rotor disposed in a motor according to an embodiment.

[0066] Figure 16 This is a front view of a rotor core, illustrating another example of a rotor disposed in a motor according to an embodiment.

[0067] Figure 17 This is a plan view of a rotor core, illustrating another example of a rotor disposed in a motor according to an embodiment.

[0068] Figure 18 This is a perspective view illustrating a first plate disposed in the rotor core of another example of a rotor disposed in a motor according to an embodiment.

[0069] Figure 19 This is a plan view illustrating a first plate disposed in the rotor core of another example of a rotor disposed in a motor according to an embodiment.

[0070] Figure 20This is a perspective view illustrating a second plate disposed in the rotor core of another example of a rotor disposed in a motor according to an embodiment.

[0071] Figure 21 This is a plan view illustrating a second plate disposed in the rotor core of another example of a rotor disposed in a motor according to an embodiment.

[0072] Figure 22 This is a perspective view illustrating a third plate disposed in the rotor core of another example of a rotor disposed in a motor according to an embodiment.

[0073] Figure 23 This is a plan view illustrating a third plate disposed in the rotor core of another example of a rotor disposed in a motor according to an embodiment. Detailed Implementation

[0074] In the following, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0075] However, the spirit of the present invention is not limited to the several embodiments described and which may be implemented in various different forms, and at least one or more components of each embodiment may be selectively combined, substituted and used within the scope of the spirit of the invention.

[0076] Furthermore, unless otherwise clearly and specifically defined by the context, all terms used herein (including technical and scientific terms) are to be interpreted as having the meaning commonly understood by those skilled in the art, and the meaning of commonly used terms, such as those defined in common dictionaries, will be interpreted by taking into account the contextual meaning of the relevant art.

[0077] Furthermore, the terminology used in the embodiments of the present invention is for descriptive purposes only and is not limited to the present invention.

[0078] In this specification, unless the context clearly indicates otherwise, the singular form includes its plural form, and in the case of describing “at least one of A, B and C (or one or more of them)”, this may include at least one combination of all possible combinations of A, B and C.

[0079] In addition, in the description of the components of the present invention, terms such as "first", "second", "A", "B", "(a)" and "(b)" may be used.

[0080] These terms are only used to distinguish one element from another, and the nature, order, etc., of the elements are not limited by these terms.

[0081] Additionally, it should be understood that when an element is referred to as “connected” or “coupled” to another element, such a description may include cases where the element is directly connected or coupled to the other element, as well as cases where the element is connected or coupled to the other element through another element disposed between the element and the other element.

[0082] Additionally, when any element is described as being formed or disposed "on" or "below" another element, such a description includes cases where the two elements are formed or disposed in direct contact with each other, as well as cases where one or more other elements are inserted between the two elements. Furthermore, when an element is described as being formed "on" or "below" another element, such a description can include cases where one element is formed on the upper or lower side relative to the other element.

[0083] Figure 1 The illustration shows a view of a motor according to an embodiment, and Figure 2 This is a perspective view illustrating the rotor and shaft according to an embodiment. Figure 1 In this context, the x-direction can be radial, and the y-direction can be axial. Furthermore, the axial and radial directions can be perpendicular to each other. In this case, the axial direction can be the longitudinal direction of axis 500.

[0084] Reference Figure 1 and Figure 2 According to the embodiment, the motor 1 may include a housing 100, a cover 200 disposed on the housing 100, a stator 300 disposed in the housing 100, a rotor 400 disposed inside the stator 300, and a shaft 500 connected to the rotor 400. An opening is formed on one side of the housing 100. In this case, the term "inward" may refer to the direction toward the rotation center C of the motor 1 in the radial direction, and the term "outward" may refer to the opposite direction to "inward".

[0085] Additionally, the motor 1 may include a busbar 600 disposed on the stator 300 and a sensor portion 700 for detecting the rotation of the rotor 400.

[0086] like Figure 4 As shown, the rotor 400 connected to the shaft 500 can be referred to as a shaft assembly. Therefore, the shaft assembly can be configured as a single part for assembling the motor 1.

[0087] The housing 100 and the cover 200 can form the exterior of the motor 1. Furthermore, the housing 100 and the cover 200 can be joined to form a receiving space. Therefore, as... Figure 2 As shown, the stator 300, rotor 400, shaft 500, busbar 600, and sensor part 700 can be arranged in the receiving space.

[0088] In this configuration, the shaft 500 is rotatably disposed within the receiving space. Therefore, the motor 1 may also include bearings 10 disposed on the upper and lower portions of the shaft 500. In this case, the bearing 10 disposed in the housing 100 may be referred to as the first bearing or the lower bearing, and the bearing 10 disposed in the cover 200 may be referred to as the second bearing or the upper bearing.

[0089] The housing 100 can be formed into a cylindrical shape. Furthermore, the housing 100 can house the stator 300, rotor 400, etc. In this case, the shape or material of the housing 100 can vary. For example, the housing 100 can be formed from a metallic material that can stably withstand even very high temperatures.

[0090] The housing 100 may include a recessed portion in its lower part for receiving the bearing 10. In this case, the recessed portion of the housing 100 may be referred to as the housing recessed portion.

[0091] The cover 200 can be disposed on the open surface of the housing 100, i.e., the upper portion of the housing 100, to cover the opening of the housing 100. In this case, the shape or material of the cover 200 can vary. For example, the cover can be formed of a metallic material that can stably withstand even very high temperatures.

[0092] Alternatively, the cover 200 may include a recessed portion therein for receiving the bearing 10. In this case, the recessed portion of the cover 200 may be referred to as the cover recessed portion.

[0093] The stator 300 causes an electrical interaction with the rotor 400 to cause the rotor 400 to rotate.

[0094] The stator 300 can be disposed inside the housing 100. In this case, the stator 300 can be supported by the inner circumferential surface of the housing 100. Alternatively, the stator 300 can be disposed outside the rotor 400. That is, the rotor 400 can be rotatably disposed inside the stator.

[0095] Reference Figure 1 The stator 300 may include a stator core 310, an insulator 320 disposed on the stator core 310, and a coil 330 wound around the insulator 320.

[0096] The coil 330 that generates the rotating magnetic field can be wound around the stator core 310. In this case, the stator core 310 can be formed as a single core or by connecting multiple separate cores.

[0097] The stator core 310 can be formed as a stack of multiple thin steel plates, but it is not limited to this. For example, the stator core 310 can also be formed as a single component.

[0098] The stator core 310 may include a yoke having a cylindrical shape and a plurality of toothed portions protruding from the yoke in the radial direction.

[0099] Multiple toothed portions can be arranged to be spaced apart from each other in the circumferential direction of the yoke. Therefore, grooves in which the coil 330 is wound around the toothed portions can be formed between the toothed portions.

[0100] Meanwhile, the toothed portion of the stator 300 can be configured to have an air gap between the toothed portion and the rotor 400. In this case, the air gap can be the radial distance between the toothed portion and the magnet 420.

[0101] Insulator 320 insulates the stator core 310 from the coil 330. Therefore, insulator 320 can be disposed between the stator core 310 and the coil 330.

[0102] Therefore, the coil 330 can be wound around the rotor core 310 on which the insulator 320 is disposed.

[0103] The rotor 400 rotates due to its electrical interaction with the stator 300. In this case, the rotor 400 can be rotatably disposed inside the stator 300.

[0104] Figure 3 The illustration shows a perspective view of the rotor according to an embodiment. Figure 4 The illustration shows a plan view of the rotor according to an embodiment. Figure 5 The illustration shows a cross-sectional view of the rotor according to an embodiment. Figure 6 It's a diagram. Figure 5 A magnified view of region A. Figure 7 This is a perspective view illustrating the arrangement of the rotor core and magnets of a rotor according to an embodiment. Figure 8 This is a view illustrating the rotor core of a rotor according to an embodiment.

[0105] Reference Figures 2 to 8 The rotor 400 may include a rotor core 410, a plurality of magnets 420 disposed on the outer side of the rotor core 410, and a can-shaped member 430 disposed on the rotor core 410 connected to the magnets 420. In this case, the magnets 420 may be arranged to be spaced apart from each other at predetermined intervals in the circumferential direction based on a center C on the rotor core 410. In this case, the rotor 400 may be the rotor according to the first embodiment.

[0106] The rotor core 410 can be formed as a stack of multiple thin steel plates or as a container. In this case, the rotor core 410 can be formed to have a predetermined length d1 in the axial direction. In this case, the length d1 of the rotor core 410 in the axial direction can be referred to as the first length.

[0107] Additionally, a hole for connection with shaft 500 can be formed at the center C of rotor core 410.

[0108] The rotor core 410 may include a rotor core body 411 having a cylindrical shape, a plurality of guide portions 412 extending outward from the outer peripheral surface 411a of the rotor core body 411, and a hole 413 formed in the rotor core body 411. In this case, the hole 413 may be referred to as the first hole.

[0109] The rotor core body 411 can be formed in a cylindrical shape, and a hole for connection with the shaft 500 can be formed at the center C of the rotor core body 411.

[0110] The guide section 412 can be integrally formed with the rotor core body 411.

[0111] The guide portion 412 can guide the arrangement of the magnets 420. Therefore, the magnets 420 can be disposed between the guide portions 412. In this case, the magnets 420 are supported by the guide portions 412 so that movement of the magnets 420 in the circumferential direction can be prevented. In this case, the guide portion 412 can be formed on the outer peripheral surface 411a of the rotor core body 411 and extend in the axial direction.

[0112] The hole 413 can be formed in the rotor core body 411 to pass through the rotor core body 411 in the axial direction. In this case, the plurality of holes 413 can be formed to be spaced apart from each other in the circumferential direction.

[0113] Furthermore, the hole 413 can be connected to the protrusion 431a of the can-shaped member 430. Therefore, the rotor core 410 can be positioned at a predetermined location in the can-shaped member 430 due to the connection between the hole 413 and the protrusion 431a. In this case, considering the arrangement of the magnet 420, the can-shaped member 430 can be arranged to be radially spaced from the outer peripheral surface 411a of the rotor core body 411. That is, the rotor core 410 disposed in the can-shaped member 430 can be arranged to be radially spaced from the can-shaped member 430.

[0114] In this case, an example of a hole 413 for connection through the rotor core body 411 has been described, but the invention is not limited thereto. For example, instead of the hole 413, a groove may also be formed recessed in the lower surface of the rotor core body 411 in the axial direction.

[0115] Therefore, when manufacturing the rotor 400, the first assembly of the rotor core 410 and the canister 430 can be performed by the connection between the hole 413 and the protrusion 431a. Thus, the rotor core 410 can be fixed to the canister 430 by this connection.

[0116] The magnet 420 generates a rotating magnetic field through the coil 330 wound around the stator core 310 of the stator 300.

[0117] Therefore, due to the electrical interaction between the coil 330 and the magnet 420, the rotor 400 rotates, and the shaft 500 rotates together with the rotor 400, thereby generating the driving force of the motor 1.

[0118] Magnet 420 is disposed on the outside of rotor core 410 to realize a surface permanent magnet (SPM) rotor.

[0119] The magnet 420 can be disposed between the outer peripheral surface 411a of the rotor core body 411 and the can-shaped member 430. Alternatively, the magnet 420 can be disposed via the guide portion 412.

[0120] In the first assembly state where the rotor core 410 and the canister 430 are connected by the hole 413 and the protrusion 431a, since the magnet 420 is inserted between the rotor core 410 and the canister 430, the conventional bonding process for fixing the rotor core and the magnet can be omitted. Therefore, since the bonding process of the motor 1 is omitted, the time for curing the adhesive components is reduced, and thus the productivity of the motor 1 can be improved.

[0121] Meanwhile, each magnet in the magnet 420 can be formed to have a predetermined length d2 in the axial direction. In this case, the length d2 of the magnet 420 in the axial direction can be referred to as the second length. In addition, considering the size of the motor 1 in the axial direction and the driving force, the length d2 of the magnet 420 in the axial direction is greater than the length d1 of the rotor core 410 in the axial direction.

[0122] The can-shaped component 430 can protect the rotor core 410 and the magnet 420 from physical or chemical stimulation. Additionally, the can-shaped component 430 can prevent the magnet 420 from separating from the rotor core 410. In this case, the can-shaped component 430 can be configured to cover the magnet 420 disposed on the rotor core 410.

[0123] The can-shaped component 430 may include a base 431, a body 432 extending axially from the base 431, and a plurality of extension portions 433 extending from an end portion 432a of the body 432. In this case, the base 431, the body 432, and the plurality of extension portions 433 may be integrally formed.

[0124] The base 431 may be formed in a disc shape. In addition, the base 431 may include a hole formed in the central portion for the arrangement of the shaft 500.

[0125] Additionally, the base 431 may be configured to contact the lower portion of the rotor core 410 and the magnet 420 to support the rotor core 410 and the magnet 420.

[0126] Additionally, the base 431 may include a protruding portion 431a that projects in the axial direction. In this case, the protruding portion 431a may be connected to the hole 413 to guide the connection between the rotor core 410 and the canister 430 and to support the rotor core 410.

[0127] Simultaneously, an adhesive component, such as glue, can be applied to the upper surface, i.e., the inner surface, of the base 431 to more firmly connect the rotor core 410 to the can-shaped member 430. Furthermore, since the upper surface can contact one side of the magnet 420, the magnet 420 and the can-shaped member 430 can also be more firmly connected by the adhesive component. In this case, the upper surface can be a contact surface that contacts either the rotor core 410 or the magnet 420.

[0128] The body 432 can be configured to face the outer peripheral surface of the rotor core 410. In addition, the inner surface of the body 432 can be configured to contact the magnet 420.

[0129] The body 432 can be formed into a tubular shape. Therefore, the body 432 can be positioned at a predetermined radius R1 based on a center C. In this case, the center C can be the axial center of the shaft 500. Furthermore, the radius R1 of the body 432 can be the distance from the axial center of the shaft 500 to the inner surface of the body 432. Additionally, the radius R1 of the body 432 can be referred to as the first radius.

[0130] The extension portion 433 can extend from the end portion 432a of the body 432. In this case, the multiple extension portions 433 can be arranged to be spaced apart from each other in the circumferential direction on the end portion of the body 432. Therefore, gaps can be formed between the extension portions 433, and the portion cut to form the gap can be referred to as the vacancy portion B. In this case, the gap can indicate the spacing distance between the extension portions 433.

[0131] Therefore, the magnet 420 can be easily inserted into the extension 433 due to the vacancy B.

[0132] like Figure 2 As shown, the vacancy B can be configured to overlap with the guide portion 412 in the radial or axial direction. In this case, the upper portion of the guide portion 412 can be exposed from the can-shaped member 430 due to the vacancy B. In this case, the upper portion of the guide portion 412 may include a portion of the upper surface or outer surface of the guide portion 412. Therefore, the position of the magnet 420 can be checked by checking the position of the guide portion 412 through the vacancy B.

[0133] The extension portion 433 may be formed in the shape of a plate. Specifically, the extension portion 433 may include a first region 433a that is spaced apart from the magnet 420 in the radial direction and a second region 433b that extends from one end of the first region.

[0134] Furthermore, the first region 433a of the extension 433 can be disposed on a predetermined radius R2 based on the center C. Therefore, the extension 433 can be configured to have a predetermined curvature. In this case, the radius R2 of the extension 433 can be the inner radius, i.e., the distance from the axial center of the shaft 500 to the inner surface of the extension 433. Specifically, the radius R2 of the extension 433 can be the distance from the axial center of the shaft 500 to the inner surface of the first region 433a of the extension 433. Additionally, the radius R2 of the extension can be referred to as the second radius.

[0135] In addition, considering the automation of the assembly of magnet 420, the radius R2 of the extension portion 433 in the radial direction based on the center C can be greater than the radius R1 of the body 432.

[0136] Simultaneously, the upper end of the extension 433 is bent to cover a portion of the upper surface 421 of the magnet 420 and a portion of the upper surface of the rotor core 410. In this case, the extension 433 may be configured to cover the entire upper surface 421 of the magnet 420, but is not limited to this. For example, the extension 433 may be configured to cover a portion of the upper surface 421 of the magnet 420, but from the perspective of protecting the magnet 420, the extension 433 may be configured to cover the entire upper surface 421.

[0137] Furthermore, considering the assemblability of the magnet 420 due to the elasticity of the extension portion 433, the lower end of the first region 433a, i.e., the lower end of the extension portion 433, can be positioned at a level lower than the upper surface 421 of the magnet 420. Alternatively, the end portion 432a of the body 432 can be positioned at a level lower than the upper surface 421 of the magnet 420.

[0138] Therefore, the lower portion of the vacancy B can be positioned at a level lower than the upper surface 421 of the magnet 420. However, considering the assemblability achieved by inserting the magnet 420, the lower portion of the vacancy B can be positioned at a level approximately 1 mm to 2 mm lower than the upper surface 421 of the magnet 420.

[0139] Alternatively, from the perspective of protecting the magnet 420 by minimizing its exposure relative to the outside, the lower end of the extension 433, i.e., the lower end of the first region 433a, can be positioned at the same level as the upper surface 421 of the magnet 420. Alternatively, the end portion 432a of the body 432 can be positioned at the same level as the upper surface 421 of the magnet 420.

[0140] Meanwhile, since the axial length d2 of each magnet in magnet 420 can be larger than the axial length d1 of rotor core 410, the end portion of the bent extension 433 can contact the upper surface of rotor core 410 through a caulking mechanism. Figure 6 As shown, the second region 433b can be bent into a stepped portion by caulking the second region 433b. Therefore, a portion of the end portion of the second region 433b can contact the upper surface of the rotor core 410. In this case, the upper surface of the rotor core 410 can be the upper surface of the rotor core body 411. Therefore, the fixing force of the can-shaped member 430 on the magnet 420 can be further improved.

[0141] Additionally, the rotor 400 may also include an adhesive member 440 disposed between the upper surface 421 of the magnet 420 and the extension 433.

[0142] The adhesive component 440 can further improve the connection between the can 430 and the magnet 420. Therefore, separation of the magnet 420 can be prevented.

[0143] Alternatively, the adhesive member 440 may be disposed between the upper surface of the rotor core 410 and the extension portion 433. Therefore, the connection force between the can-shaped member 430, which is configured to cover the magnet 420, and the rotor core 410 can be further improved. Thus, due to the connection and caulking between the hole 413 of the rotor core 410 and the protrusion 431a of the can-shaped member 430, and the connection between the rotor core 410 and the extension portion 433 via the adhesive member 440, separation between the rotor core 410 and the magnet 420 disposed on the can-shaped member 430 can be prevented.

[0144] Figure 9 This is a set of views illustrating the process of manufacturing a can-shaped rotor according to an embodiment. In this case, Figure 9 (a) in the figure is a view illustrating the material used to manufacture the can-shaped parts. Figure 9 (b) is a view illustrating the material with the voids formed, and Figure 9 (c) is a view illustrating a can-shaped part formed by molding a material with a void.

[0145] like Figure 9As shown in (b), multiple vacant parts B can be achieved through... Figure 9 The blank portion B is formed by creating a void in a material with a disc-shaped form, as shown in (a). In this case, a hole for arranging the shaft 500 can be formed in the central portion of the material. In this case, the blank portion B can be formed at predetermined intervals along the circumferential direction at the edge of the material. Therefore, an extension portion 433 can be formed.

[0146] In addition, such as Figure 9 As shown in (c), the can-shaped part 430 can be formed by performing a drawing and a stamping process on a material having the notch B. For example, the can-shaped part 430 having a basket shape can be formed by a drawing process. In this case, the can-shaped part 430 having two stepped portions can be formed such that the radius of the body 432 and the radius of the extension portion 433 of the can-shaped part 430 are different based on the center C. In addition, the protruding portion 431a of the can-shaped part 430 can be formed by a stamping process.

[0147] Figure 9 (a) to Figure 9 The process in (c) can be automated and executed sequentially by separate devices (not shown).

[0148] Figures 10a to 10d A view illustrating the process of manufacturing a rotor according to an embodiment is shown, wherein, Figure 10a This is an exploded perspective view illustrating the connection between the bore in the rotor core and the protruding portion of the can-shaped component. Figure 10b The diagram shows an exploded perspective view of the connecting magnets with the rotor core and the can-shaped component connected. Figure 10c It is a three-dimensional diagram illustrating the connection of the magnets with the rotor core and the can-shaped component connected. Figure 10d This is a view illustrating the process of bending the extension of a can-shaped component.

[0149] Reference Figure 10a The rotor core 410 can be disposed within the can-shaped member 430. In this case, since the hole 413 of the rotor core 410 is connected to the protrusion 431a of the can-shaped member 430, the rotor core 410 can be positioned at a predetermined position, and this connection prevents movement of the rotor core 410. In this case, the outer peripheral surface 411a of the rotor core 410 can be configured to be radially spaced from the inner peripheral surface of the can-shaped member 430 to form a space for the magnet 420 to be inserted therein.

[0150] Reference Figure 10b and Figure 10cThe magnet 420 can be inserted into and disposed in the space formed between the rotor core 410 and the can-shaped member 430. In this case, the magnet 420 can be guided by the guide portion 412 of the rotor core 410. In this case, since the radius of the extension portion 433 can be formed such that the center C is larger than the radius of the body 432 of the can-shaped member 430, the magnet 420 can be inserted into the space without interfering with the extension portion 433.

[0151] Reference Figure 10c and Figure 10d The extension 433 of the can-shaped member 430 can be bent inward. Therefore, the extension 433 can cover a portion of the upper side of the rotor core 410 and the upper surface 421 of the magnet 420.

[0152] In this configuration, the extension portion 433 and the upper surface 421 of the magnet 420 can be securely connected by arranging an adhesive member 440 between the extension portion 433 and the upper surface 421 of the magnet 420. Furthermore, the axial length d2 of the magnet 420 is formed to be greater than the axial length d1 of the rotor core 410, and the caulking process performed on the end portion of the curved extension portion 433 allows the upper surface of the rotor core 410 to contact the extension portion 433. Therefore, the connection force between the magnet 420 and the canister 430 can be further improved. In this configuration, the connection force can be further improved by arranging the adhesive member 440 between the upper surface of the rotor core 410 and the extension portion 433.

[0153] use Figures 10a to 10d The process can eliminate the need for the bonding process already applied to motor 1.

[0154] in addition, Figures 10a to 10d The process can be automated and executed sequentially using separate devices (not shown).

[0155] Therefore, the productivity of rotor 400 and the motor including the rotor can be improved through the above process.

[0156] The shaft 500 can be configured within the housing 100 to rotate via the bearing 100. Additionally, the shaft 500 can rotate together with the rotor 400.

[0157] Alternatively, the shaft 500 can be press-fitted to a hole formed in the central portion of the rotor core 410.

[0158] Busbar 600 can be installed on stator 300.

[0159] In addition, busbar 600 can be electrically connected to coil 330 of stator 300.

[0160] Busbar 600 may include a busbar body (not shown) and a plurality of terminals disposed in the busbar body. In this case, the busbar body may be a molded portion formed by injection molding. Additionally, each terminal may be electrically connected to a coil 330 of the stator 300.

[0161] The sensor section 700 can detect the position of the rotor 400 to detect the rotation of the shaft 500 by detecting the magnetic force of a sensing magnet mounted to operate together with the rotation of the rotor 400.

[0162] The sensor section 700 may include a sensing magnet assembly 710 and a printed circuit board (PCB) 720.

[0163] The sensing magnet assembly 710 is coupled to the shaft 500 to operate together with the rotor 400 to detect the position of the rotor 400. In this case, the sensing magnet assembly 710 may include a sensing magnet and a sensing plate.

[0164] The sensing magnet may include a main magnet and a secondary magnet, wherein the main magnet is configured to be close to a hole in the circumferential direction near the inner circumferential surface of the sensing magnet, and the secondary magnet is formed at the edge of the sensing magnet.

[0165] The main magnet can be arranged in the same way as the drive magnet inserted into the rotor 400 of the motor.

[0166] The secondary magnet can be further subdivided compared to the primary magnet, resulting in a greater number of magnetic poles in the secondary magnet than in the primary magnet. Therefore, the rotation angle can be more precisely defined and measured due to the secondary magnet, leading to a smoother motor drive.

[0167] The sensing plate can be formed from a disc-shaped metal material. A sensing magnet can be attached to the upper surface of the sensing plate. Additionally, the sensing plate can be attached to a shaft 500. In this case, a hole can be formed in the sensing plate for the shaft 500 to pass through.

[0168] A sensor that detects the magnetic force of a sensing magnet can be mounted on PCB 720. In this case, the sensor can be a Hall integrated circuit (IC). Furthermore, the sensor can detect changes in the N and S poles of the sensing magnet and generate a sensing signal. Therefore, PCB 720 with a Hall IC mounted on it can be referred to as a sensing component or a position detection device.

[0169] Reference Figure 1According to the embodiment, the motor 1 may include a housing 100, a cover 200 disposed on the housing 100, a stator 300 disposed in the housing 100, a rotor 1400 disposed inside the stator 300, a shaft 500 rotating together with the rotor 1400, a busbar 600 disposed on the stator 300, and a sensor portion 700 for detecting the rotation of the shaft 500, with an opening formed on one side of the housing. In this case, the rotor 1400 may be the rotor according to the second embodiment.

[0170] In the following description, when the motor 1 using the rotor 1400 according to the second embodiment is described, since the same parts as those of the motor 1 using the rotor 400 according to the first embodiment are assigned the same reference numerals, detailed descriptions of these parts will be omitted.

[0171] The rotor 1400 rotates due to electrical interaction with the stator 300. The rotor 1400 can be rotatably disposed inside the stator 300. In addition, the shaft 500 can be connected to the central portion of the rotor 1400.

[0172] Figure 11 This is a perspective view illustrating another example of the rotor of a motor according to an embodiment. Figure 12 This is a front view illustrating another example of the rotor of a motor according to an embodiment. Figure 13 This is a plan view illustrating another example of the rotor of a motor according to an embodiment. Figure 14 This is a view illustrating the connection relationship between the rotor core and the magnet in another example of a rotor provided in a motor according to an embodiment. Figure 15 This is a perspective view of a rotor core, illustrating another example of a rotor disposed in a motor according to an embodiment. Figure 16 This is a front view of a rotor core, illustrating another example of a rotor disposed in a motor according to an embodiment, and Figure 17 This is a plan view of a rotor core, illustrating another example of a rotor disposed in a motor according to an embodiment.

[0173] The rotor 1400 can be formed by connecting the rotor core 1410 and the magnet 1420.

[0174] Reference Figures 11 to 14 The rotor 1400 can be formed as a surface permanent magnet (SPM) type rotor in which magnets 1420 are disposed on the outer side of the rotor core 1410. In this case, magnets 1420 can be disposed on the outer side of the rotor core 1410 without the use of adhesive due to protrusions 1412 and 1413. In this case, protrusion 1412 can be referred to as a guide portion or rotor core protrusion, and protrusion 1413 can be referred to as a guide protrusion or rotor core protrusion.

[0175] The rotor core 1410 of the rotor 1400 can be manufactured by joining multiple separate cores or as a single core comprising a container. Alternatively, the rotor core 1410 can be formed as a stack of multiple plates having a sheet shape. In this case, the plates can be steel plates.

[0176] The rotor core 1410 may include a body 1411, a protruding portion 1412, and a protruding part 1413. The protruding portion 1412 is formed to protrude from the body 1411 in a radial direction, and the protruding part 1413 is formed to protrude from the protruding portion 1412 in a circumferential direction. In addition, the body 1411 may be referred to as the rotor core body.

[0177] In this configuration, the protruding portion 1412 may include a first protruding portion 1412a, a second protruding portion 1412b, and a third protruding portion 1412c. Additionally, the protruding portion 1413 may include a first protruding portion 1413a and a second protruding portion 1413b, with the first protruding portion 1413a protruding from the first protruding portion 1412a in a circumferential direction, and the second protruding portion 1413b protruding from the second protruding portion 1412b in a circumferential direction.

[0178] In this configuration, a portion of the second protrusion 1413b is arranged to overlap the first protrusion 1412a in the axial direction, and the remainder may be exposed (see [reference]). Figure 17 ).

[0179] Therefore, when the magnet 1420 is inserted into the rotor core 1410, the magnet 1420 is guided in the axial direction by the first protrusion 1412a and the first protrusion 1413a of the rotor core 1410 and inserted between the first protrusion 1412a and the first protrusion 1413a of the rotor core, and the end portion of the second protrusion 1413b can be bent in the axial direction (the insertion direction of the magnet 1420) by the magnet 1412.

[0180] Furthermore, the inner surface of the protrusion 1413a can be configured to contact the first surface 1421 provided on the outer side of the magnet 1420, and the second protrusion 1413b can be configured to contact the second surface 1422 of the magnet 1420 in the circumferential direction. Therefore, the first protrusion 1413a and the second protrusion 1413b prevent the magnet 1420 from separating from the rotor core 1410. In this case, the first surface 1421 can be referred to as the outer surface of the magnet 1420. Additionally, the second surface 1422 can be referred to as the side surface of the magnet 1420.

[0181] Therefore, when the motor 1 is driven, the first protrusion 1413a and the second protrusion 1413b can prevent the magnet 1420 from separating from the rotor core 1410.

[0182] The body 1411 may include a hole formed in the central portion for connection to the shaft and an outer surface that contacts the magnet 1420.

[0183] The protruding portion 1412 can be formed to protrude radially from the outer surface of the body 1411. Furthermore, the plurality of protruding portions 1412 can be formed to be spaced apart from each other in the circumferential direction. Therefore, the magnet 1420 can be disposed between the protruding portions 1412 in the circumferential direction, and the protruding portions 1412 can support the magnet 1420 to prevent movement of the magnet 1420 in the circumferential direction.

[0184] The protruding portion 1412 may include a first protruding portion 1412a, a second protruding portion 1412b, and a third protruding portion 1412c arranged to overlap in the axial direction.

[0185] Reference Figure 17 Each of the first protrusions in the first protrusion 1412a may be formed to have a predetermined width W1 in the circumferential direction.

[0186] Furthermore, the plurality of first protrusions 1412a can be arranged to be spaced apart from each other in the circumferential direction. Therefore, the magnet 1420 can be disposed between the first protrusions 1412a.

[0187] Furthermore, the plurality of first protrusions 1412a can be arranged to be spaced apart from each other in the axial direction. For example, the first protrusions 1412a can be located at the uppermost or lowermost end of the body 1411 and guide the magnet 1420, so that the magnet 1420 can be positioned at a predetermined position when the magnet 1420 is inserted into the rotor core 1410. That is, the first protrusions 1412a together with the first protrusions 1413a can be used as position determining portions to determine the insertion position of the magnet 1420.

[0188] Reference Figure 17 Each of the second protruding portions 1412b can be formed to have a predetermined width W2 in the circumferential direction. Furthermore, the width W2 of the second protruding portion 1412b in the circumferential direction can be smaller than the width W1 of the first protruding portion 1412a in the circumferential direction. That is, the width W1 of the first protruding portion 1412a in the circumferential direction can be greater than the width W2 of the second protruding portion 1412b in the circumferential direction.

[0189] Therefore, the portion of the second protrusion 1413b that protrudes from the second protrusion 1412b in the circumferential direction can be configured to overlap with the first protrusion 1412a in the axial direction. Thus, even when a side of the magnet 1420 is inserted while in contact with the first protrusion 1412a, the second protrusion 1413b can be easily bent.

[0190] Furthermore, since the second protrusion 1413b contacts the second surface 1422 of the magnet 1420 while bending, the second protrusion 1412b can be configured to be spaced apart from the second surface 1422 of the magnet 1420 in the circumferential direction due to the second protrusion 1413b. Therefore, a predetermined gap can be formed between the second protrusion 1412b and the second surface 1422 of the magnet 1420.

[0191] The third protrusion 1412c may be disposed in the axial direction between the first protrusion 1412a and the second protrusion 1412b, or between the second protrusions 1412b that are spaced apart from each other in the axial direction.

[0192] Furthermore, the third protrusion 1412c can be formed with the same shape as the second protrusion 1412b. Specifically, the width of each third protrusion 1412c in the circumferential direction can be the same as the width W2 of the second protrusion 1412b in the circumferential direction. Therefore, when the second protrusion 1413b bends, the third protrusion 1412c can provide space to allow the second protrusion 1413b to bend. That is, when the second protrusion 1413b bends, the third protrusion 1412c provided in the axial direction can allow the magnet 1420 to be easily inserted by providing space to allow the second protrusion 1413b to be positioned.

[0193] The protrusion 1413 can support the magnet 1420 to prevent the magnet 1420 from moving. Therefore, in the motor 1, the magnet 1420 can be attached to the rotor core 1410 without the use of adhesive.

[0194] In addition, the protrusion 1413 can guide the arrangement of the magnet 1420.

[0195] The protrusion 1413 may include a first protrusion 1413a and a second protrusion 1413b, wherein the first protrusion 1413a is formed to protrude from the first protrusion 1412a in a circumferential direction, and the second protrusion 1413b is formed to protrude from the second protrusion 1412b in a circumferential direction.

[0196] The first protrusion 1413a can be configured to be radially spaced from the outer surface of the body 1411. Therefore, a portion of the magnet 1420 can be disposed between the first protrusion 1413a and the outer surface of the body 1411. In this case, the inner surface of the first protrusion 1413a can contact the first surface 1421 of the magnet 1420. Therefore, the first protrusion 1413a can prevent the magnet 1420 from separating in the radial direction.

[0197] In addition, the first protrusion 1413a may be provided at the uppermost or lowermost side of the rotor core 1410 to guide the insertion of the magnet 1420.

[0198] Alternatively, a portion of the first protrusion 1413a may be configured to overlap with the second protrusion 1413b in the axial direction. In this case, the second protrusion 1413b may be configured to be spaced apart from the first protrusion 1413a in the axial direction.

[0199] The second protrusion 1413b can be configured to be radially spaced from the outer surface of the body 1411. In this case, the end portion of the second protrusion 1413b can be positioned in the insertion direction of the magnet 1420.

[0200] The second protrusion 1413b can be bent by the insertion of the magnet 1420, and one side of the second protrusion 1413b can contact the second surface 1422 of the magnet 1420. Therefore, the second protrusion 1413b can support the magnet 1420 using the elastic restoring force generated during bending. Thus, the second protrusion 1413b can prevent the magnet 1420 from separating in the axial direction. In this case, since a portion of the second protrusion 1413b is configured to overlap with the first protrusion 1412a in the axial direction, the second protrusion 1413b can be easily bent. In this case, the portion of the second protrusion 1413b that overlaps with the first protrusion 1412a in the axial direction can be a region connected to the second protrusion 1412b.

[0201] Furthermore, the protruding length L2 of each second protrusion in the second protrusion 1413b in the circumferential direction can be greater than the protruding length L1 of each first protrusion in the first protrusion 1413a in the circumferential direction. In this case, the protruding direction of the second protrusion 1413b can be parallel to the outer surface of the body 1411.

[0202] In addition, such as Figure 17As shown, the end portions of the second protrusions 1413b, which are formed to face each other in the circumferential direction, can be formed on the second protrusion 1412b with predetermined gaps G. For example, each predetermined gap G can be formed between the end portion of a second protrusion 1413b protruding from a second protrusion 1412b and the end portion of a second protrusion 1413b protruding from the second protrusion 1412b, which is arranged to face and be adjacent to the end portion in the circumferential direction.

[0203] Additionally, the rotor core 1410 may also include a hole 1414 formed in the protrusion 1412. In this case, the hole 1414 may be referred to as a second hole.

[0204] The hole 1414 can reduce magnetic flux leakage of the magnet 1420. In this case, the hole 1414 can be formed to penetrate in the axial direction. In this case, the hole 1414 can be formed in the first protrusion 1412a, but is not limited thereto. For example, the hole 1414 can be formed to extend to the second protrusion 1412b or the third protrusion 1412c.

[0205] The rotor core 1410 can be formed by stacking multiple plates having a plate shape. In this case, each plate can be formed to have a predetermined thickness in the axial direction.

[0206] Reference Figure 13 and Figure 14 The rotor core 1410 can be formed by stacking a first plate 1410a, a second plate 1410b, and a third plate 1410c in the axial direction. In this case, the stacking order of the first plate 1410a, the second plate 1410b, and the third plate 1410c in the axial direction can vary, taking into account the connection of the magnet 1420.

[0207] In addition, the thickness t of each first plate in the first plate 1410a, the thickness t of each second plate in the second plate 1410b, and the thickness t of each third plate in the third plate 1410c can be the same in the axial direction.

[0208] However, even when the thickness of the first plate 1410a is the same as the thickness of the second plate 1410b, considering the centrifugal force applied to the magnet 1420 due to the drive of the motor 1, the number of first plates 1410a may be greater than the number of second plates 1410b. Furthermore, even when the thickness of the third plate 1410c is the same as the thickness of each of the first plate 1410a and the second plate, considering the bending of the second protrusion 1413b, the number of third plates may be greater than the number of first plates 1410a.

[0209] In this case, an example has been described in which the first plate 1410a, the second plate 1410b, and the third plate 1410c have the same thickness t in the axial direction, but the present invention is not limited to this. For example, because a centrifugal force can be applied to the magnet 1420 due to the rotation of the motor 1, the thickness of the first plate 1410a can be greater than the thickness of the second plate 1410b. In addition, since the third plate 1410c is configured to adjust the distance between the first plate 1410a and the second plate 1410b, or the distance between the second plates 1410b, the thickness of the third plate 1410c can be greater than the thickness of the first plate 1410a or the second plate 1410b.

[0210] Figure 18 This is a perspective view illustrating a first plate disposed in the rotor core of another example of a rotor disposed in a motor according to an embodiment. Figure 19 This is a plan view illustrating a first plate disposed in the rotor core of another example of a rotor disposed in a motor, according to an embodiment. Figure 20 This is a perspective view illustrating a second plate disposed in the rotor core of another example of a rotor disposed in a motor, according to an embodiment. Figure 21 This is a plan view illustrating a second plate disposed in the rotor core of another example of a rotor disposed in a motor, according to an embodiment. Figure 22 This is a perspective view illustrating a third plate disposed in the rotor core of another example of a rotor disposed in a motor, according to an embodiment. Figure 23 This is a plan view illustrating a third plate disposed in the rotor core of another example of a rotor disposed in a motor, according to an embodiment.

[0211] Reference Figure 18 and Figure 19 The first plate 1410a may include a first plate body 1411a, a first protruding portion 1412a protruding radially from the first plate body 1411a, and a first protruding portion 1413a protruding circumferentially from an end portion of the first protruding portion 1412a. Additionally, the first plate 1410a may include a hole 1414 formed in the first protruding portion 1412a.

[0212] Considering the connection of shaft 500, a hole may be formed in the central portion of the first plate body 1411a. In addition, the first plate body 1411a may be formed with the same shape as the second plate body 1411b of the second plate 1410b and the third plate body 1411c of the third plate 1410c.

[0213] The first protrusion 1412a and the first protrusion 1413a can guide the insertion of the magnet 1420. Therefore, the first plate 1410a can be positioned at the top or bottom when the plates are stacked.

[0214] The first protrusion 1412a can be configured to have a predetermined width W1 in the circumferential direction. Furthermore, a plurality of first protrusions 1412a can be configured to be spaced apart from each other in the circumferential direction on the first plate body 1411a. Therefore, the magnet 1420 can be disposed between the first protrusions 1412a.

[0215] The first protrusion 1413a can be formed to protrude from the first protrusion 1412a in the circumferential direction. In this case, the first protrusion 1413a can be arranged to be radially spaced from the outer surface of the first plate body 1411a. Therefore, the magnet 1420 can be disposed between the outer surface of the first plate body 1411a and the inner surface of the first protrusion 1413a.

[0216] Therefore, the first protrusion 1413a can prevent the magnet 1420 from separating in the radial direction.

[0217] The second plate 1410b can be disposed between the first plates 1410a in the axial direction.

[0218] In addition, the plurality of second plates 1410b can be configured to be spaced apart from each other in the axial direction, and the axial distance between the second plates 1410b can be adjusted taking into account the curvature of the second protrusion 1413b of the second plates 1410b.

[0219] For example, multiple second plates 1410b can be configured to be spaced apart from the first plate 1410a in the axial direction by a third plate 1410c. In this case, taking into account the bending of the second protrusion 1413b, the axial spacing distance D2 between the second plates 1410b can be greater than or equal to the protruding length L2 of the second protrusion 1413b in the circumferential direction.

[0220] In addition, the axial spacing distance D1 between the lowermost second plate 1410b among the plurality of second plates 1410b and the first plate 1410a disposed on the lower side of the rotor core 1410 in the axial direction can be greater than or equal to the length L2 of the second protrusion 1413b in the circumferential direction.

[0221] Reference Figure 20 and Figure 21 The second plate 1410b may include a second plate body 1411b, a second protruding portion 1412b protruding radially from the second plate body 1411b, and a second protruding portion 1413b protruding circumferentially from the end portion of the second protruding portion 1412b.

[0222] When the boards are stacked, the second board 1410b can be positioned between the first board 1410a or the third board 1410c.

[0223] Considering the connection of shaft 500, a hole can be formed in the central part of the second plate body 1411b.

[0224] Multiple second protrusions 1412b can be configured to be spaced apart from each other in the circumferential direction on the second plate body 1411b.

[0225] Furthermore, the second protrusion 1412b can be formed to have a predetermined width W2 in the circumferential direction. In this case, the width W2 of the second protrusion 1412b in the circumferential direction can be smaller than the width W1 of the first protrusion 1412a in the circumferential direction. Therefore, when the magnet 1420 is connected to the rotor core 1410, the second protrusion 1412b can be configured to be spaced apart from the magnet 1420 in the circumferential direction.

[0226] The second protrusion 1413b can be formed to protrude from the second protrusion 1412b in the circumferential direction. In this case, the second protrusion 1413b can be arranged to be radially spaced from the outer surface of the second plate body 1411b.

[0227] Furthermore, the second protrusion 1413b can be formed to have a predetermined protrusion length L2. In this case, taking into account the bending of the second protrusion 1413b and the elastic restoring force generated due to bending, the protrusion length L2 can be greater than the thickness t of the plate. For example, the protrusion length L2 can be greater than the thickness t of the second plate 1410b. The protrusion length L2 can be four times or more than the thickness t of the second plate 1410b. In this case, the protrusion length L2 can be less than half the length (L3 / 2) of the outer surface of the second plate body 1411b that contacts the third surface 1423 of the magnet 1420. Therefore, the gap G can be provided between the end portions of the second protrusion 1413b in the circumferential direction.

[0228] In addition, the protruding direction of the second protrusion 1413b can be parallel to the outer surface of the body 1411.

[0229] Additionally, the end portion of the second protrusion 1413b, which is formed to face each other in the circumferential direction, can be formed to have a predetermined gap G.

[0230] Therefore, when the magnet 1420 is inserted into the rotor core 1410, the second protrusion 1413b can be bent in the axial direction. Thus, one side of the second protrusion 1413b can contact the second surface 1422 of the magnet 1420 to prevent the magnet 1420 from separating in the axial direction.

[0231] The third plate 1410c can be disposed axially between the first plate 1410a and the second plate 1410b or between the second plates 1410b.

[0232] Additionally, multiple third plates 1410c can be arranged along the axial direction. In this case, the third plates 1410c can be arranged between the first plate 1410a and the second plate 1410b or between the second plates 1410b to adjust the axial distance between the first plate 1410a and the second plate 1410b or the axial distance between the second plates 1410b.

[0233] Reference Figure 22 and Figure 23 The third plate 1410c may include a third plate body 1411c and a third protruding portion 1412c that protrudes radially from the third plate body 1411c.

[0234] Considering the connection of shaft 500, a hole can be formed in the central part of the third plate body 1411c.

[0235] Multiple third protrusions 1412c can be configured to be spaced apart from each other in the circumferential direction on the plate body 1411c. In this case, the third protrusions 1412c can be formed with the same shape as the second protrusions 1412b. Therefore, the width of the third protrusions 1412c in the circumferential direction can be the same as the width W2 of the second protrusions 1412b in the circumferential direction.

[0236] The magnet 1420 can generate a rotating magnetic field with the coil 300 wound around the stator 300. The magnet 1420 can be configured such that the N pole and the S pole are alternately arranged in the circumferential direction relative to the axis 500.

[0237] Therefore, the rotor 1400 rotates due to the electrical interaction between the coil 330 and the magnet 1420, and as the rotor 1400 rotates, the shaft 500 rotates to generate the driving force of the motor 1.

[0238] Additionally, the magnet 1420 may include a first surface 1421 configured to contact the first protrusion 1413a, a second surface 1422 configured to contact the second protrusion 1413b, and a third surface 1423 configured on the opposite side of the first surface 1421 in the radial direction.

[0239] Although the invention has been described above with reference to exemplary embodiments, those skilled in the art will understand that various modifications and alterations can be made without departing from the spirit and scope of the invention as defined by the appended claims.

[0240] Figure Labels

[0241] 1: Motor; 100: Housing; 200: Cover; 300: Stator; 400, 1400: Rotor; 500: Shaft; 600: Busbar; 700: Sensor section

Claims

1. A motor comprising: a stator; and a rotor provided inside the stator, wherein the rotor includes a rotor core and a magnet provided on an outer side portion of the rotor core, the rotor core is formed by stacking a plurality of plates, the plates include first plates and second plates, each of the first plates includes a first plate body, a first protruding portion protruding from the first plate body in a radial direction, and a first protruding portion protruding from an end portion of the first protruding portion in a circumferential direction, each of the second plates includes a second plate body, a second protruding portion protruding from the second plate body in the radial direction, and a second protruding portion protruding from an end portion of the second protruding portion in the circumferential direction, and when the magnet is inserted into the rotor core, a portion of the magnet is provided between the first protruding portion and an outer surface of the first plate body in the radial direction, and the second protruding portion is bent in an axial direction to be in contact with a second surface of the magnet in the circumferential direction. A width (W1) of the first protruding portion in the circumferential direction is greater than a width (W2) of the second protruding portion in the circumferential direction.

2. The motor of claim 1, wherein, The second protruding portion is provided to be spaced apart from the second surface of the magnet in the circumferential direction.

3. The motor of claim 2, wherein, A portion of the second protruding portion is provided to overlap the first protruding portion in the axial direction.

4. The motor of claim 2, wherein, The first protruding portion includes a hole formed to pass through the first protruding portion in the axial direction.

5. The motor of claim 2, wherein, 6. The motor according to claim 1, wherein: the second plates are provided between the first plates; the plates include third plates provided between the first plates and the second plates or between the second plates; the third plates include third plate bodies and third protruding portions protruding from the third plate bodies in the radial direction; and the third protruding portions are formed in the same shape as a shape of the second protruding portions.

7. The motor according to claim 6, wherein: a plurality of the second plates are provided to be spaced apart from each other in the axial direction by the first plates and the third plates; and a spacing distance (D2) between the second plates is greater than or equal to a protruding length (L2) of the second protruding portions in the circumferential direction. End portions of the second protruding portions provided to face each other in the circumferential direction are formed to have a predetermined gap (G).

8. The motor of claim 1, wherein, The protruding length (L2) of the second protruding portions in the circumferential direction is greater than a thickness (t) of each of the plates.

9. The motor of claim 8, wherein, ​

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