Rotor and motor having the same

Abstract

An embodiment discloses a motor comprising a stator; a rotor positioned corresponding to the stator; and a shaft coupled to the rotor, wherein the rotor comprises a rotor core coupled to the shaft and a plurality of magnets positioned spaced apart from each other along the circumferential direction on the outer side of the rotor core, wherein the rotor core comprises a body having a hole formed in the center and a plurality of first guides and second guides formed protruding from the outer surface of the body, and two magnets are positioned such that a predetermined first spacing space (S1) is formed between two first guides positioned adjacently with respect to the circumferential direction, and the first spacing space (S1) overlaps with the second guides in the axial direction. Accordingly, the motor can reduce production costs by using a rotor core formed by stacking single-shaped plates in the axial direction, while simultaneously reducing leakage magnetic flux caused by the guides.

Description

Technology Field

[0001] The embodiment relates to a rotor and a motor including the same. Background Technology

[0002] A motor is a device that converts electrical energy into mechanical energy to generate rotational force, and it is widely used in vehicles, household electronic appliances, industrial equipment, and the like. In particular, the motor can be used in devices to ensure steering stability in automobiles. For instance, the motor can be used in vehicle motors such as Electronic Power Steering Systems (EPS).

[0003] The motor may include a housing, a shaft, a stator disposed on the inner circumference of the housing, and a rotor installed on the outer circumference of the shaft. Here, the stator induces electrical interaction with the rotor to induce rotation of the rotor.

[0004] The rotor may include a rotor core comprising a cylindrical body and a plurality of guides formed to protrude radially from the outer surface of the body, a plurality of magnets spaced apart from each other along the circumferential direction on the rotor core, and a can disposed to cover the rotor core to which the magnets are attached. Here, the rotor may be formed as a Surface Permanent Magnet (SPM) type in which magnets are attached to the surface of the rotor core, and the can may perform the function of protecting the rotor and preventing the magnets from detaching.

[0005] In the case of the above-mentioned SPM type rotor, magnets are attached to the rotor core using an adhesive due to structural characteristics. At this time, since the guide guiding the placement of the magnets is formed extending along the axial direction from the upper surface to the lower surface of the rotor core, there is a problem of leakage magnetic flux occurring through the guide. Consequently, there is a problem of reduced performance of the motor.

[0006] In addition, since an assembly tolerance is formed between the guide and the magnet and the magnet is covered by the can, it is difficult to align the magnet at a predetermined interval along the circumferential direction and to verify the alignment.

[0007] Even if the magnet is aligned through the rotation of the can, there is a problem in that it is difficult to verify the alignment state of the magnet by the can. Furthermore, in the case of aligning the magnet through the rotation of the can, the alignment effect resulting from the alignment is insufficient, leading to a problem where the cogging torque increases. Moreover, the increase in cogging torque can reduce the performance of the motor.

[0008] Therefore, there is a need for a rotor and a motor including the same that can improve productivity by minimizing the production cost of the rotor and the generation of the leakage flux. The problem to be solved

[0009] The embodiment provides a rotor and a motor including the same that reduce production costs and the generation of leakage flux by using a rotor core formed by stacking plates formed in a single shape.

[0010] The problems that the embodiments aim to solve are not limited to those mentioned above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0011] The above problem is achieved by a motor comprising: a stator; a rotor positioned to correspond to the stator; and a shaft coupled to the rotor, wherein the rotor comprises a rotor core coupled to the shaft and a plurality of magnets spaced apart from each other along the circumferential direction on the outer side of the rotor core, wherein the rotor core comprises a body with a hole formed in the center, and a first guide and a second guide formed to protrude from the outer surface of the body, wherein the first guide and the second guide are alternately positioned on the body along the circumferential direction, and the magnet comprises a first side and a second side in the circumferential direction, and the first guide positioned to face the first side in the circumferential direction is not rotationally symmetric with the second guide positioned to face the second side in the circumferential direction.

[0012] The above problem comprises a stator; a rotor positioned to correspond to the stator; and a shaft coupled to the rotor, wherein the rotor comprises a rotor core coupled to the shaft and a plurality of magnets positioned to be spaced apart from each other along the circumferential direction on the outer side of the rotor core, wherein the rotor core comprises a body having a hole formed in the center and a plurality of first guides and second guides formed to protrude from the outer surface of the body, and two magnets are positioned such that a predetermined first spaced-away space (S1) is formed between two first guides positioned adjacently with respect to the circumferential direction, and the first spaced-away space (S1) is achieved by a motor that overlaps the second guide in the axial direction.

[0013] Here, the rotor core is formed by stacking a plurality of plates, and the plates include a plate body in the shape of a disc and a plurality of protrusions formed to protrude radially from the outer surface of the plate body, the number of magnets is 2N, and the number of protrusions may be N.

[0014] Meanwhile, the rotor core may further include a third guide spaced apart from the first guide in the axial direction. Here, two magnets are arranged such that a predetermined second spacing space (S2) is formed between two second guides arranged adjacently with respect to the circumferential direction, and the second spacing space (S2) may be arranged to overlap the first guide and the third guide in the axial direction. Effects of the invention

[0015] The embodiment can reduce production costs by using a rotor core formed by stacking plates of a single shape in the axial direction.

[0016] Additionally, the embodiment may form a first guide and a second guide that guide the arrangement of magnets by adjusting the arrangement of protrusions formed by the single plate. Here, by arranging the first guide and the second guide so as not to overlap in the axial direction to form a gap between the magnets, leakage magnetic flux can be reduced.

[0017] The various and beneficial advantages and effects of the embodiments are not limited to those described above and may be more easily understood in the process of explaining specific embodiments. Brief explanation of the drawing

[0018] FIG. 1 is a drawing showing a motor according to an embodiment, and FIG. 2 is a perspective view showing the rotor of a motor according to an embodiment, and FIG. 3 is a front view showing the rotor of a motor according to an embodiment, and FIG. 4 is a plan view showing the rotor of a motor according to an embodiment, and FIG. 5 is a perspective view showing a rotor core of a rotor according to an embodiment, and FIG. 6 is a front view showing the rotor core of a rotor according to an embodiment, and FIG. 7 is a plan view showing the rotor core of a rotor according to an embodiment, and FIG. 8 is a perspective view showing a plate of a rotor core disposed in a motor according to an embodiment, and FIG. 9 is a perspective view showing a modified example of a rotor disposed in a motor according to an embodiment, and FIG. 10 is a front view showing a modified example of a rotor disposed in a motor according to an embodiment, and FIG. 11 is a perspective view showing a rotor core of a rotor according to a modified example, and FIG. 12 is a front view showing the rotor core of a rotor according to a modified example. Specific details for implementing the invention

[0019] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0020] However, the technical concept of the present invention is not limited to some of the described embodiments but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components among the embodiments may be selectively combined or substituted.

[0021] In addition, terms used in the embodiments of the present invention (including technical and scientific terms) may be interpreted in a sense that is generally understood by those skilled in the art to which the present invention belongs, unless explicitly and specifically defined otherwise. Terms that are commonly used, such as terms defined in advance, may be interpreted in consideration of their meaning in the context of the relevant technology.

[0022] Furthermore, the terms used in the embodiments of the present invention are for the purpose of describing the embodiments and are not intended to limit the present invention.

[0023] In this specification, the singular form may include the plural form unless specifically stated otherwise in the text, and when described as "at least one of A and B and C (or more than one)," it may include one or more of all combinations that can be formed from A, B, and C.

[0024] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are used merely to distinguish the components from other components and are not intended to limit the essence, order, or sequence of the components.

[0025] Furthermore, when described as being formed or placed "above or below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as "above or below," it may include the meaning of a downward direction as well as an upward direction relative to a single component.

[0026] Hereinafter, embodiments will be described in detail with reference to the attached drawings, provided that identical or corresponding components are given the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted.

[0027] FIG. 1 is a drawing showing a motor according to an embodiment. In FIG. 1, the x direction may represent the radial direction, and the y direction may represent the axial direction. Also, the axial direction and the radial direction may be perpendicular to each other. Here, the axial direction may be the longitudinal direction of the shaft (500).

[0028] Referring to FIG. 1, a motor according to an embodiment may include a housing (100) having an opening formed on one side, a cover (200) disposed on the upper part of the housing (100), a stator (300) disposed inside the housing (100), a rotor (400) disposed inside the stator (300), and a shaft (500) coupled to the rotor (400). Here, the term "inside" refers to a direction disposed toward the rotation center (C) of the motor with respect to the radial direction, and the term "outside" may refer to a direction opposite to the inside. Also, the rotor (400) may be called a rotor according to the first embodiment.

[0029] Additionally, the motor may further include a bus bar (600) positioned above the stator (300). Additionally, the motor may further include a sensor unit (700) for detecting rotation of the rotor (400) and the shaft (500).

[0030] The housing (100) and the cover (200) can form the external shape of the motor. Additionally, a receiving space can be formed inside by combining the housing (100) and the cover (200). Accordingly, as shown in FIG. 1, a stator (300), a rotor (400), a shaft (500), a bus bar (600), a sensor unit (700), etc. can be arranged in the receiving space.

[0031] At this time, the shaft (500) is rotatably positioned in the receiving space. Accordingly, the motor may further include bearings (B) positioned at the upper and lower portions of the shaft (500), respectively. Here, the bearing (B) positioned in the housing (100) may be called the first bearing or lower bearing, and the bearing (B) positioned in the cover (200) may be called the second bearing or upper bearing.

[0032] The housing (100) may be formed in a cylindrical shape. The housing (100) may accommodate a stator (300), a rotor (400), etc. inside. At this time, the shape or material of the housing (100) may be varied. For example, the housing (100) may be formed of a metal material that can withstand high temperatures.

[0033] The housing (100) may include a pocket portion at the bottom capable of accommodating a bearing (B). Here, the pocket portion of the housing (100) may be referred to as a housing pocket portion.

[0034] The cover (200) can be placed on the opening surface of the housing (100), that is, on the upper part of the housing (100), to cover the opening of the housing (100).

[0035] And, the cover (200) may include a pocket portion capable of accommodating a bearing (B). Here, the pocket portion of the cover (200) may be called a cover pocket portion.

[0036] The stator (300) induces electrical interaction with the rotor (400) to induce rotation of the rotor (400).

[0037] The stator (300) may be positioned inside the housing (100). At this time, the stator (300) may be supported on the inner circumference of the housing (100). Additionally, the stator (300) may be positioned outside the rotor (400). That is, the rotor (400) may be rotatably positioned inside the stator (300).

[0038] Referring to FIG. 1, the stator (300) may include a stator core (310), an insulator (320) placed on the stator core (310), and a coil (330) wound on the insulator (320).

[0039] A coil (330) that forms a rotating magnetic field may be wound on the stator core (310). Here, the stator core (310) may be formed as a single core or formed by combining multiple divided cores.

[0040] The stator core (310) may be formed by stacking multiple plates in the form of thin steel plates, but is not necessarily limited thereto. For example, the stator core (310) may be formed as a single unit.

[0041] The stator core (310) may include a cylindrical yoke and a plurality of teeth protruding radially from the yoke.

[0042] A plurality of the above-mentioned teeth may be spaced apart from each other along the circumferential direction of the yoke. Accordingly, a slot, which is a space for winding a coil (330), may be formed between each of the above-mentioned teeth.

[0043] Meanwhile, the teeth of the stator (300) may be arranged to have an air gap with the rotor (400). Here, the air gap may be the distance between the teeth and the magnet (420) in the radial direction.

[0044] The insulator (320) insulates the stator core (310) and the coil (330). Accordingly, the insulator (320) can be placed between the stator core (310) and the coil (330).

[0045] Accordingly, the coil (330) can be wound on the stator core (310) on which the insulator (320) is placed.

[0046] The rotor (400) rotates through electrical interaction with the stator (300). At this time, the rotor (400) can be rotatably positioned on the stator (300).

[0047] FIG. 2 is a perspective view showing a rotor of a motor according to an embodiment, FIG. 3 is a front view showing a rotor of a motor according to an embodiment, FIG. 4 is a plan view showing a rotor of a motor according to an embodiment, FIG. 5 is a perspective view showing a rotor core of a rotor according to an embodiment, FIG. 6 is a front view showing a rotor core of a rotor according to an embodiment, FIG. 7 is a plan view showing a rotor core of a rotor according to an embodiment, and FIG. 8 is a perspective view showing a plate of a rotor core disposed in a motor according to an embodiment.

[0048] Referring to FIGS. 2 through 8, the rotor (400) may include a rotor core (410) and a plurality of magnets (420) disposed on the outside of the rotor core (410). Additionally, the rotor (400) may include a can (not shown) disposed on the rotor core (410) to which the magnets (420) are attached. Additionally, the rotor (400) may include an adhesive member for attaching the magnets (420) to the rotor core (410). Here, the magnets (420) may be disposed on the rotor core (410) at predetermined intervals along the circumferential direction with respect to the center (C).

[0049] The rotor core (410) may be implemented in a stacked form of a plurality of single-shaped plates (430) or in a single cylindrical form. In this case, the rotor core (410) may be formed to have a predetermined height (H) in the axial direction. Here, the plates (430) may be provided in the form of thin steel plates.

[0050] And, a hole to which a shaft (500) is coupled may be formed in the center (C) of the rotor core (410).

[0051] The rotor core (410) may include a cylindrical body (411) with a hole formed in the center, and a plurality of first guides (412) and second guides (413) that extend outwardly from the outer surface of the body (411) and protrude. Here, the plurality of first guides (412) and second guides (413) may be spaced apart from each other on the outer surface of the body (411) to guide the placement of the magnet (420). For example, the plurality of first guides (412) and second guides (413) may be alternately arranged on the body (411) along the circumferential direction to guide the placement of the magnet (420).

[0052] Additionally, the number of each of the first guide (412) and the second guide (413) may be N, and the number of the magnets (420) may be 2N. Here, 'N' may be an odd number among integers. For example, the number of each of the first guide (412) and the second guide (413) may be 7, and the number of the magnets (420) may be 14.

[0053] The above body (411) may be formed in a cylindrical shape, and a hole to which a shaft (500) is coupled may be formed at the center (C).

[0054] Additionally, the magnet (420) can be attached to the outer surface of the body (411) through the adhesive member. That is, the adhesive member can be positioned between the outer surface of the body (411) and the inner surface of the magnet (420). Accordingly, the magnet (420) can be fixed to the outer surface of the body (411).

[0055] Referring to FIGS. 4 and 7, when viewed from the axial direction, the first guide (412) and the second guide (413) may be arranged alternately along the circumferential direction. Additionally, a magnet (420) may be placed between the first guide (412) and the second guide (413). Accordingly, the first guide (412) and the second guide (413) may each come into contact with one side and the other side of the magnet (420) with respect to the circumferential direction.

[0056] For example, the first guide (412) may contact the first side (421) among the first side (421) and the second side (422) arranged in the circumferential direction of the magnet (420), and may guide the magnet (420) inserted in the axial direction. Also, the second guide (413) may contact the second side (422) to guide the magnet (420).

[0057] Referring to FIG. 4, two first guides (412) arranged adjacently in the circumferential direction can be placed in the body (411) such that a first central angle (θ1) is formed with respect to the center (C). Additionally, two magnets (420) arranged adjacently in the circumferential direction can be placed in the body (411) such that a second central angle (θ2) is formed with respect to the center (C). Furthermore, the first guide (412) and the second guide (413) arranged adjacently in the circumferential direction can be placed in the body (411) such that a third central angle (θ3) is formed with respect to the center (C).

[0058] Furthermore, the first central angle (θ1) may be larger than the second central angle (θ2). Also, the second central angle (θ2) may be equal to the third central angle (θ3). Here, the second central angle (θ2) may be the angle between the imaginary line connecting the circumferential center (C1) and the center (C) of each of the two magnets (420). Additionally, the first central angle (θ1) and the third central angle (θ3) may be the angle formed using at least one of the first guide (412) and the second guide (413) with respect to the center (C).

[0059] The first guide (412) is positioned at the upper end of the outer surface of the body (411) with respect to the axial direction and can be formed to have a predetermined axial length. The second guide (413) is positioned at the lower end of the outer surface of the body (411) with respect to the axial direction and can be formed to have a predetermined axial length. Here, the axial length of the first guide (412) may be called the first axial length (L1), and the axial length of the second guide (413) may be called the second axial length (L2). At this time, the sum of the first axial length (L1) and the second axial length (L2) may be equal to the height (H) of the body (411).

[0060] And, as illustrated in FIGS. 3 and 6, the first guide (412) and the second guide (413) may be spaced apart diagonally from the outer surface of the body (411). That is, the first guide (412) and the second guide (413) may be arranged so as not to overlap in the axial and circumferential directions. For example, the first guide (412) and the second guide (413) may be arranged so as not to be rotationally symmetric.

[0061] Accordingly, the motor can reduce the magnetic flux leaked by the first guide (412) and the second guide (413) by reducing the proportion of the first guide (412) and the second guide (413) on the outer surface of the rotor core (410) (see FIG. 5 and FIG. 6).

[0062] At this time, the first axial length (L1) and the second axial length (L2) may be the same, but are not necessarily limited thereto. For example, they may be larger than the first axial length (L1) and the second axial length (L2), but even in this case, the first guide (412) and the second guide (413) must be spaced apart diagonally from the outer surface of the body (411) so as not to be rotationally symmetrical. However, it is preferable to form the first axial length (L1) and the second axial length (L2) the same so that magnetic flux leakage by the first guide (412) and the second guide (413) is evenly distributed.

[0063] The first guide (412) may be positioned to face the first side (421), which is one side of the magnet (420). At this time, the first guide (412) may come into contact with the first side (421). Additionally, the first guide (412) may be positioned on the upper side of the body (411) with respect to the axial direction. Accordingly, the first guide (412) may support the upper side of the magnet (420).

[0064] The second guide (413) may be positioned to face the second side (422), which is one side of the magnet (420). At this time, the second guide (413) may come into contact with the second side (422). Additionally, the second guide (413) may be positioned on the lower side of the body (411) with respect to the axial direction. Accordingly, the second guide (413) may support the lower side of the magnet (420).

[0065] Referring to FIGS. 2 and 3, the lower surface (412a) of the first guide (412) and the upper surface (413a) of the second guide (413) can be positioned on a virtual same horizontal plane. That is, the lower surface (412a) of the first guide (412) and the upper surface (413a) of the second guide (413) can be positioned on a virtual first horizontal plane (A1) that is positioned to cross the axial center of the body horizontally (radially). Accordingly, the first guide (412) and the second guide (413) are not rotationally symmetric in the circumferential direction.

[0066] Additionally, two magnets (420) may be arranged between two first guides (412) that are adjacent to each other based on the circumferential direction, such that a predetermined first spacing space (S1) is formed. Accordingly, the leakage magnetic flux may be reduced by the first spacing space (S1). Furthermore, a jig may be inserted into the first spacing space (S1) to induce alignment of the magnets (420). At this time, the aligned magnets (420) may be fixed to the outer surface of the body (411) by an adhesive member.

[0067] Additionally, two magnets (420) may be arranged such that a predetermined second spacing space (S2) is formed between two adjacent second guides (413) based on the circumferential direction. Accordingly, the leakage magnetic flux may be reduced by the second spacing space (S2). Furthermore, a jig may be inserted into the second spacing space (S2) to induce alignment of the magnets (420). At this time, the aligned magnets (420) may be fixed to the outer surface of the body (411) by an adhesive member.

[0068] Here, since the first guide (412) and the second guide (413) are respectively disposed on one side and the other side of the magnet (420), the first spacing space (S1) can overlap with the second guide (413) in the axial direction. Additionally, the second spacing space (S2) can overlap with the first guide (412) in the axial direction.

[0069] Meanwhile, the rotor core (410) can be formed by stacking a plurality of plates (430) formed in a single shape in the axial direction. However, the rotor core (410) may use a plate with protrusions removed to further reduce leakage flux, but since a separate mold must be produced to produce a plate with protrusions removed, there is a problem of increased mold manufacturing costs. Therefore, the motor can reduce production costs by using a single plate produced using only one mold.

[0070] The above plate (430) may include a plate body (431) in the shape of a disc with a hole formed in the center and a plurality of protrusions (432) formed to protrude radially from the outer surface of the plate body (431). Here, when the number of magnets (420) is 2N, the number of protrusions (432) may be N. In this case, 'N' may be an odd number among integers. For example, the number of protrusions (432) may be 7 and the number of magnets (420) may be 14.

[0071] Accordingly, the first guide (412) can be formed by stacking the protrusions (432) of the plate (430), and the second guide (413) can be formed by stacking the plates while rotating the plate (430) in the circumferential direction. Accordingly, the first guide (412) and the second guide (413) can be formed to be spaced apart in the diagonal direction.

[0072] The magnet (420) forms a rotating magnetic field with the coil (330) wound on the stator core (310) of the stator (300). Accordingly, the rotor (400) rotates due to the electrical interaction between the coil (330) and the magnet (420), and the shaft (500) rotates in conjunction with the rotation of the rotor (400), thereby generating the driving force of the motor.

[0073] Additionally, the magnet (420) may be positioned between the first guide (412) and the second guide (413) based on the circumferential direction. At this time, the upper side, which is part of the first side (421) of the magnet (420), may be positioned facing the first guide (412), and the lower side, which is part of the second side (422), may be positioned facing the second guide (413). Accordingly, since the magnet (420) is positioned between the first spacing space (S1) and the second spacing space (S2), magnetic flux leakage caused by the first guide (412) and the second guide (413) can be reduced.

[0074] The can can protect the rotor core (410) and the magnet (420) from physical or chemical stimuli. Additionally, the can can prevent the magnet (420) from detaching from the rotor core (410). Here, the can can be positioned to cover the magnet (420) placed on the rotor core (410).

[0075] Therefore, since the rotor (400) aligns the magnet (420) through the spacing (S1, S2) and fixes the magnet (420) to the body (411) using the adhesive member, there is no need to rotate the can separately. Accordingly, the process of rotating the can to align the magnet (420) can be eliminated, thereby reducing the production cost of the motor.

[0076] The shaft (500) can be rotatably positioned inside the receiving space by means of a bearing (B).

[0077] Additionally, the shaft (500) can rotate together with the rotation of the rotor (400). At this time, the shaft (500) can be coupled by a press-fit method into a hole formed in the center of the rotor core (410).

[0078] The above busbar (600) can be placed on the upper part of the stator (300).

[0079] And, the busbar (600) can be electrically connected to the coil (330) of the stator (300).

[0080] The busbar (600) may include a busbar body (not shown) and a plurality of terminals (not shown) disposed inside the busbar body. Here, the busbar body may be a molded body formed by injection molding. And, each of the terminals may be electrically connected to a coil (330) of a stator (300).

[0081] The sensor unit (700) detects the magnetic force of a sensing magnet installed to rotate in conjunction with the rotor (400) and determines the current position of the rotor (400), thereby enabling the detection of rotation of the shaft (500).

[0082] The sensor unit (700) may include a sensing magnet assembly (710) and a printed circuit board (PCB, 720).

[0083] The sensing magnet assembly (710) is coupled to the shaft (500) to work in conjunction with the rotor (400) so as to detect the position of the rotor (400). At this time, the sensing magnet assembly (710) may include a sensing magnet and a sensing plate.

[0084] The above sensing magnet may include a main magnet arranged circumferentially adjacent to a hole forming an inner surface and a sub-magnet formed at the edge.

[0085] The above main magnet can be arranged in the same way as the drive magnet inserted into the rotor (400) of the motor.

[0086] The above sub-magnet can be formed to have more poles than the above main magnet, with more fine divisions. Accordingly, the above sub-magnet makes it possible to measure the rotation angle by dividing it more finely and can induce smoother driving of the motor.

[0087] The sensing plate may be formed from a disc-shaped metal material. A sensing magnet may be attached to the upper surface of the sensing plate. The sensing plate may be attached to a shaft (500). Here, a hole through which the shaft (500) passes may be formed in the sensing plate.

[0088] A sensor for detecting the magnetic force of the sensing magnet may be placed on the printed circuit board (720). Here, the sensor may be provided as a Hall IC. The sensor may generate a sensing signal by detecting a change in the N and S poles of the sensing magnet. Accordingly, the printed circuit board (720) on which the Hall IC is placed may be called a sensing assembly or a position sensing device.

[0089] FIG. 9 is a perspective view showing a modified example of a rotor placed in a motor according to an embodiment, FIG. 10 is a front view showing a modified example of a rotor placed in a motor according to an embodiment, FIG. 11 is a perspective view showing a rotor core of a rotor according to a modified example, and FIG. 12 is a front view showing a rotor core of a rotor according to a modified example.

[0090] The rotor (400a) illustrated in FIGS. 9 and 10 may be placed in the motor in place of the rotor (400) described above. Accordingly, the motor may further include a housing (100) having an opening formed on one side, a cover (200) placed on the upper side of the housing (100), a stator (300) placed inside the housing (100), a rotor (400a) placed inside the stator (300), a shaft (500) coupled to the rotor (400), a bus bar (600) placed on the upper side of the stator (300), and a sensor unit (700) for detecting the rotation of the rotor (400). Here, the rotor (400a) according to the modified example may be called the rotor according to the second embodiment.

[0091] Referring to FIGS. 9 to 11, the rotor (400a) may include a rotor core (410a) and a plurality of magnets (420) disposed on the outside of the rotor core (410a). Additionally, the rotor (400a) may include a can (not shown) disposed on the rotor core (410a) to which the magnets (420) are attached. Additionally, the rotor (400a) may include an adhesive member for attaching the magnets (420) to the rotor core (410).

[0092] The rotor core (410a) may be implemented in a stacked form of a plurality of single-shaped plates (430) or in a single tube form. In this case, the rotor core (410a) may be formed to have a predetermined height (H) in the axial direction. That is, the plates (430) may also be used in the rotor (400a) according to the second embodiment.

[0093] The rotor core (410a) may include a cylindrical body (411) with a hole formed in the center, and a plurality of first guides (412), second guides (413), and third guides (414) that extend outwardly from the outer surface of the body (411) and protrude. Here, the plurality of first guides (412), second guides (413), and third guides (414) may be spaced apart from each other on the outer surface of the body (411) to guide the placement of the magnet (420). Additionally, the third guide (414) may be arranged to overlap the first guide (412) in the axial direction. At this time, the third guide (414) may be spaced apart from the first guide (412) in the axial direction, and a second spaced-away space (S2) in the axial direction may be arranged between the first guide (412) and the third guide (414).

[0094] Additionally, the number of each of the first guide (412), second guide (413), and third guide (414) may be N, and the number of magnets (420) may be 2N. Here, 'N' may be an odd integer. The sum of the number of each of the first guide (412), second guide (413), and third guide (414) may be greater than the number of magnets (420). For example, the sum of the number of each of the first guide (412), second guide (413), and third guide (414) may be 21, and the number of magnets (420) may be 14.

[0095] Referring to FIGS. 9 and 10, the first guide (412) and the third guide (414) can come into contact with one side of the magnet (420) in the circumferential direction. Also, the second guide (413) can come into contact with the other side of the magnet (420) in the circumferential direction.

[0096] For example, the first guide (412) and the third guide (414) may contact the first side (421) positioned in the circumferential direction of the magnet (420) and may guide the magnet (420) inserted in the axial direction. Additionally, the second guide (413) may contact the second side (422) to guide the magnet (420).

[0097] Referring to FIG. 4, each of the two first guides (412) and third guides (414) arranged adjacently in the circumferential direction can be positioned in the body (411) such that a first central angle (θ1) is formed with respect to the center (C). Additionally, two magnets (420) arranged adjacently in the circumferential direction can be positioned in the body (411) such that a second central angle (θ2) is formed with respect to the center (C). Furthermore, the first guides (412) and third guides (414) can be positioned in the body (411) such that a third central angle (θ3) is formed with respect to the center (C) and a second guide (413) arranged adjacently in the circumferential direction.

[0098] The first guide (412) is positioned at the top of the outer surface of the body (411) with respect to the axial direction and may be formed to have a predetermined first axial length (L1). The second guide (413) is positioned at the middle of the outer surface of the body (411) with respect to the axial direction and may be formed to have a predetermined second axial length (L2). The third guide (414) is positioned at the bottom of the outer surface of the body (411) with respect to the axial direction and may be formed to have a predetermined third axial length (L3). Here, the sum of the first axial length (L1), the second axial length (L2), and the third axial length (L3) may be equal to the height (H) of the body (411).

[0099] And, as illustrated in FIGS. 11 and 12, the second guide (413) may be positioned diagonally spaced from the outer surface of the body (411) and the first guide (412) and the third guide (414), respectively. That is, the second guide (413) may be positioned so as not to overlap with the first guide (412) and the third guide (414), respectively, in the axial and circumferential directions. For example, the second guide (413) may be positioned so as not to be rotationally symmetric with respect to the first guide (412) and the third guide (414), respectively.

[0100] Each of the first guide (412) and the third guide (414) may be positioned to face the first side (421), which is one side of the magnet (420). At this time, each of the first guide (412) and the third guide (414) may come into contact with the first side (421). Here, the third guide (414) may be positioned on the lower side of the body (411) with respect to the axial direction. Accordingly, the third guide (414) may support the lower side of the magnet (420) in addition to the first guide (412) which supports the upper side of the magnet (420).

[0101] The second guide (413) may be positioned to face the second side (422), which is one side of the magnet (420). At this time, the second guide (413) may come into contact with the second side (422). Additionally, the second guide (413) may be positioned in the middle of the body (411) with respect to the axial direction. Accordingly, the second guide (413) may support the middle side of the magnet (420).

[0102] Referring to FIGS. 9 and 10, the lower surface (412a) of the first guide (412) and the upper surface (413a) of the second guide (413) can be positioned on a virtual same horizontal plane. That is, the lower surface (412a) of the first guide (412) and the upper surface (413a) of the second guide (413) can be positioned on a virtual second horizontal plane (A2) among the virtual horizontal planes that divide the body (411) into three equal parts in the axial direction. Accordingly, the first guide (412) and the second guide (413) are not rotationally symmetric in the circumferential direction.

[0103] Additionally, the lower surface (413a) of the second guide (413) and the upper surface (414a) of the third guide (414) may be positioned on a virtual same horizontal plane. That is, the lower surface (413b) of the second guide (413) and the upper surface (414a) of the third guide (414) may be positioned on a virtual third horizontal plane (A3) among the virtual horizontal planes that divide the body (411) into three equal parts in the axial direction. Accordingly, the second guide (413) and the third guide (414) are not rotationally symmetric and do not overlap in the circumferential direction.

[0104] Additionally, two magnets (420) may be arranged between two first guides (412) that are adjacent in the circumferential direction to form a predetermined first spacing space (S1). Then, two magnets (420) may be arranged between two second guides (413) that are adjacent in the circumferential direction to form a predetermined second spacing space (S2). Furthermore, two magnets (420) may be arranged between two third guides (414) that are adjacent in the circumferential direction to form a predetermined third spacing space (S3). Here, the second spacing space (S2) may overlap the first guide (412) and the third guide (414) in the axial direction.

[0105] Meanwhile, the rotor core (410a) can be formed by stacking a plurality of plates (430) in the axial direction.

[0106] Accordingly, by stacking the protrusions (432) of the plurality of plates (430) while rotating them in the circumferential direction, the second guide (413) can be formed to be spaced diagonally apart from the first guide (412) and the third guide (414).

[0107] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as described in the following claims. Explanation of the symbols

[0108] 100: Housing 200: Cover 300: Status 310: Status Core 330: Coil 400, 400a: Rotor 410, 410a: Rotor core 412: Guide 1 413: Guide 2 414: The Third Guide 420: Magnet 500: Shaft 600: Busbar 700: Sensor section

Claims

Claim 1 A stator; a rotor positioned to correspond to the stator; The device includes a shaft coupled to the rotor, wherein the rotor comprises a rotor core coupled to the shaft and a plurality of magnets spaced apart from each other along the circumferential direction on the outer side of the rotor core, wherein the rotor core comprises a body with a hole formed in the center, and a first guide and a second guide formed protruding from the outer surface of the body, wherein the first guide and the second guide are alternately arranged on the body along the circumferential direction, and the magnets include a first side and a second side in the circumferential direction, wherein the first guide arranged facing the first side in the circumferential direction is not rotationally symmetric with respect to the second guide arranged facing the second side in the circumferential direction, wherein two first guides arranged adjacently in the circumferential direction are arranged on the body such that a first central angle (θ1) is formed with respect to a center (C), and two magnets arranged adjacently in the circumferential direction are arranged on the body such that a second central angle (θ2) is formed with respect to a center (C), and the first central angle (θ1) is the second Motor with a center angle greater than (θ2). Claim 2 A motor comprising a stator; a rotor positioned to correspond to the stator; and a shaft coupled to the rotor, wherein the rotor comprises a rotor core coupled to the shaft and a plurality of magnets positioned to be spaced apart from each other along the circumferential direction on the outer side of the rotor core, wherein the rotor core comprises a body having a hole formed in the center and a plurality of first guides and second guides formed to protrude from the outer surface of the body, and wherein two magnets are positioned such that a predetermined first spaced-away space (S1) is formed between two first guides positioned adjacently with respect to the circumferential direction, and the first spaced-away space (S1) overlaps with the second guides in the axial direction. Claim 3 A motor according to claim 1 or 2, wherein the rotor core is formed by stacking a plurality of plates, and the plates include a disc-shaped plate body and a plurality of protrusions formed to protrude radially from the outer surface of the plate body, the number of magnets is 2N, and the number of protrusions is N. Claim 4 In paragraph 2, two first guides arranged adjacently in the circumferential direction are arranged in the body such that a first central angle (θ1) is formed with respect to the center (C), and two magnets arranged adjacently in the circumferential direction are arranged in the body such that a second central angle (θ2) is formed with respect to the center (C), and the first central angle (θ1) is larger than the second central angle (θ2). Claim 5 A motor according to claim 1 or 2, wherein an adhesive member is disposed between the magnet and the outer surface of the body. Claim 6 A motor according to claim 1 or 2, wherein the lower surface of the first guide and the upper surface of the second guide are positioned on a virtual same horizontal plane. Claim 7 A motor according to claim 1 or 2, wherein the rotor core further comprises a third guide disposed axially spaced apart from the first guide. Claim 8 In claim 7, two magnets are arranged such that a predetermined second spacing space (S2) is formed between two adjacent second guides based on the circumferential direction, and the second spacing space (S2) is a motor that overlaps the first guide and the third guide in the axial direction. Claim 9 A motor according to claim 8, wherein the lower surface of the first guide and the upper surface of the second guide are positioned on a virtual same horizontal plane, and the lower surface of the second guide and the upper surface of the third guide are positioned on a virtual same horizontal plane. Claim 10 In claim 9, the sum of the axial length of the first guide, the axial length of the second guide, and the axial length of the third guide is equal to the axial height of the rotor core. Claim 11 delete

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