Rotor of motor and manufacturing method thereof

Abstract

The invention relates to a rotor of a motor and a manufacturing method thereof. A rotor of a motor according to the present invention comprises: a rotor core having first to n-th segment cores respectively coupled to a rotating shaft; the permanent magnets are respectively combined with the first iron core segment to the nth iron core segment; each of the plurality of magnetic steel plates of the first to nth segmented iron cores is provided with a guide groove, and a guide pin is inserted into the guide groove to guide the permanent magnet arranged on each segmented iron core of the first to nth segmented iron cores to form a preset inclination angle; the guide grooves are arranged on the inner sides of the plurality of magnetic poles along the radial direction; the guide groove comprises a first guide groove, a second guide groove and a third guide groove which are separated in the circumferential direction; each of the first guide groove, the second guide groove, and the third guide groove is disposed at a position forming a preset angle with respect to the center of a magnetic pole on the outside in the radial direction. As a result, the permanent magnets can be arranged to have an inclination angle, and the shape of the magnetic steel plates of a plurality of rotor cores separated in the axial direction can be simplified.

Description

Technical Field

[0001] The present invention relates to a rotor of a motor and a manufacturing method thereof. Background Art

[0002] As is well known, a motor is a device that converts electrical energy into mechanical energy.

[0003] Generally, the motor includes a stator and a rotor that can move relative to the stator.

[0004] The rotor includes a rotating shaft, a rotor core coupled to the rotating shaft, and a magnetic force generating unit that generates magnetic force.

[0005] A part of the rotors in the rotor constitutes a permanent magnet rotor with a permanent magnet as the magnetic force generating unit.

[0006] The permanent magnet is coupled to the outer peripheral surface of the rotor core or axially inserted and coupled to the rotor core.

[0007] On the other hand, when the permanent magnet rotor rotates relative to the stator, a cogging torque is generated due to the magnetic reluctance difference between the permanent magnet, the teeth, and the slots of the stator core.

[0008] Such a cogging torque is generated periodically according to the number of magnetic poles of the rotor and the number of teeth (slots) of the stator core.

[0009] However, in the existing rotor of a motor having such a permanent magnet, there is a problem that the cogging torque generates vibration and noise.

[0010] Considering this problem, in some motors, an inclined structure of the rotor core is designed, which axially separates the rotor core and the permanent magnet, and rotatably couples the axially separated rotor core and permanent magnet to have a preset inclination (angle) in the circumferential direction.

[0011] However, in such an existing inclined structure of the rotor core, since an assembly guide rail is formed to protrude on the shaft, and an assembly groove that can be coupled to the assembly guide rail is formed at different positions in each of a plurality of axially separated rotor cores, a plurality of molds with different shapes need to be equipped in the manufacture of the plurality of rotor cores. Therefore, there is a problem that the production of the plurality of rotor cores requires relatively more equipment (molds) and costs.

[0012] In addition, in a motor having an existing permanent magnet, in order to set an inclination in the rotor core to suppress vibration and noise caused by cogging torque, an inclined rotor for a permanent magnet motor and a manufacturing method in which the position of a rivet hole is eccentric from the normal position by a specified angle are designed.

[0013] However, in this existing rotor for tilting a permanent magnet motor and its manufacturing method, different types of dies are required to form rivet holes at positions that rotate relative to each other in the circumferential direction, so there is a problem that it is not easy to manufacture the rotor core.

[0014] In addition, in the rotor for tilting a permanent magnet motor and its manufacturing method, although a plurality of rotor cores manufactured using one die are combined by flipping, and the permanent magnets are arranged at intervals in a zigzag shape in the circumferential direction, there are the following problems: it is difficult to perform fine tilting (angle) adjustment in one direction or the other direction in the circumferential direction, so there are limitations in reducing cogging torque.

[0015] Prior Art Documents

[0016] Patent Documents

[0017] Korean Patent No. 10-2213074 (Feb. 8, 2021)

[0018] Korean Patent No. 10-1018712 (Mar. 4, 2011) Summary of the Invention

[0019] Problems to be Solved by the Invention

[0020] Therefore, an object of the present invention is to provide a rotor of a motor and a manufacturing method thereof that can simplify the shape of the magnetic steel plates of a plurality of rotor cores separated axially.

[0021] In addition, another object of the present invention is to provide a rotor of a motor and a manufacturing method thereof that can achieve an inclined structure of rotor cores with different numbers of segments axially using a magnetic steel plate of a single shape.

[0022] In addition, another object of the present invention is to provide a rotor of a motor and a manufacturing method thereof having a structure in which permanent magnets of a plurality of axially separated rotor cores are continuously arranged at intervals in one direction and / or the other direction in the circumferential direction.

[0023] Technical Solutions for Solving the Problems

[0024] The technical feature of the rotor of the motor of the present invention for solving the above problems is that the rotor core and the permanent magnet separated into a plurality of segments axially are combined in a state of continuously rotating a preset angle in one direction or the other direction in the circumferential direction, and each magnetic steel plate of the plurality of rotor cores has the same shape.

[0025] Specifically, it includes a rotor core having a plurality of segmented cores (stagecores) axially separated along a rotation axis and permanent magnets respectively disposed on the rotor core. The plurality of segmented cores are formed by stacking a plurality of magnetic steel plates. Each of the plurality of magnetic steel plates includes a rotation axis hole for coupling the rotation axis, a permanent magnet coupling portion for coupling the permanent magnet, and a plurality of guide grooves into which guide pins for guiding the permanent magnet to form an inclination angle are inserted; the plurality of guide grooves are disposed inside the plurality of magnetic poles; the plurality of guide grooves are arranged at intervals in the circumferential direction; the plurality of guide grooves are respectively disposed at positions forming a preset angle with respect to the centers of the plurality of magnetic poles on the radially outer side, so that the permanent magnets can be arranged to form a preset inclination angle, and the plurality of segmented cores can be formed by magnetic steel plates having the same shape as each other.

[0026] The rotor of a motor according to an embodiment of the present invention includes: a rotation axis; a rotor core including a first segmented core to an nth segmented core, each of the first segmented core to the nth segmented core includes a plurality of stacked magnetic steel plates, and each of the first segmented core to the nth segmented core is axially coupled to the rotation axis; and permanent magnets, the permanent magnets are respectively coupled to the first segmented core to the nth segmented core to form a plurality of magnetic poles; each of the plurality of magnetic steel plates includes: a rotation axis hole for coupling the rotation axis; a permanent magnet coupling portion for coupling the permanent magnet; and a guide groove for inserting a guide pin, the guide pin guides the permanent magnets respectively disposed on the first segmented core to the nth segmented core to form a preset inclination angle; the guide groove is radially disposed inside the plurality of magnetic poles; the guide groove includes a first guide groove, a second guide groove, and a third guide groove separated at intervals in the circumferential direction; the first guide groove, the second guide groove, and the third guide groove are respectively disposed at positions forming a preset angle with respect to the centers of the magnetic poles on the radially outer side.

[0027] Thus, the axially separated permanent magnets are arranged to form a preset inclination angle, so that the cogging torque can be finely adjusted in one direction or the other direction in the circumferential direction.

[0028] According to such a configuration, vibrations and noises generated by the cogging torque can be suppressed.

[0029] In addition, when the rotor rotates, vibrations and noises are reduced, thereby providing a motor that can operate quietly.

[0030] In addition, while realizing the inclined structure of the permanent magnet, the shapes of the magnetic steel plates of the multi-segment rotor core can be made uniform to the same shape.

[0031] According to such a configuration, the rotor can be easily manufactured.

[0032] In an embodiment of the present invention, the guide grooves include: a first group including the first guide groove, the second guide groove, and the third guide groove; and a second group formed rotationally symmetrically with respect to the center of the rotor core with the first group as a reference.

[0033] Accordingly, the two guide pins are arranged at positions rotationally symmetric to each other, so that the assembly (combination) of a plurality of the segmented cores can be easily achieved.

[0034] In an embodiment of the present invention, each of the guide holes of the first guide groove, the second guide groove, and the third guide groove includes a first guide hole and a second guide hole.

[0035] With such a configuration, when the nth segmented core is configured to be an even number of segments (for example, the second segment, the fourth segment, the sixth segment, and the eighth segment), the shape of the magnetic steel sheet of each of the segmented cores can be made uniform.

[0036] In an embodiment of the present invention, when the nth segmented core is configured to be the second segmented core, the guide pins are respectively inserted into the first guide hole of the second guide groove of the first segmented core and the second guide hole of the second guide groove of the second segmented core.

[0037] Accordingly, an inclined structure of the rotor core axially separated into two is achieved.

[0038] In an embodiment of the present invention, when the nth segmented core is configured to be the fourth segmented core, the guide pins are respectively combined with the second guide hole of the third guide groove of the first segmented core, the first guide hole of the second guide groove of the second segmented core, the second guide hole of the second guide groove of the third segmented core, and the first guide hole of the first guide groove of the fourth segmented core.

[0039] Accordingly, an inclined structure of the rotor core axially separated into four can be easily achieved.

[0040] In an embodiment of the present invention, when the nth segmented core is configured to be the sixth segmented core, the guide pins are respectively combined with the first guide hole of the third guide groove of the first segmented core, the second guide hole of the third guide groove of the second segmented core, the first guide hole of the second guide groove of the third segmented core, the second guide hole of the second guide groove of the fourth segmented core, the first guide hole of the first guide groove of the fifth segmented core, and the second guide hole of the first guide groove of the sixth segmented core.

[0041] Accordingly, an inclined structure of the rotor core axially separated into six can be easily achieved.

[0042] In an embodiment of the present invention, each guiding hole of the first guiding groove, the second guiding groove, and the third guiding groove includes a first guiding hole, a second guiding hole, and a third guiding hole.

[0043] Thus, the rotor core may include segmented cores of the second to ninth segments in which the permanent magnets have an inclined structure and the magnetic steel plates have the same shape.

[0044] In an embodiment of the present invention, when the nth segmented core is configured as the third segmented core, the guiding pins are respectively inserted into the first guiding hole of the second guiding groove of the first segmented core, the second guiding hole of the second guiding groove of the second segmented core, and the third guiding hole of the second guiding groove of the third segmented core.

[0045] According to such a configuration, an inclined structure of the rotor core axially divided into three is achieved.

[0046] In an embodiment of the present invention, when the nth segmented core is configured as the fifth segmented core, the guiding pins are respectively inserted into the third guiding hole of the third guiding groove of the first segmented core, the first guiding hole of the second guiding groove of the second segmented core, the second guiding hole of the second guiding groove of the third segmented core, the third guiding hole of the second guiding groove of the fourth segmented core, and the first guiding hole of the first guiding groove of the fifth segmented core.

[0047] Thus, an inclined structure of the rotor core axially divided into five can be easily achieved.

[0048] In an embodiment of the present invention, when the nth segmented core is configured as the seventh segmented core, the guiding pins are respectively inserted into the second guiding hole of the third guiding groove of the first segmented core, the third guiding hole of the third guiding groove of the second segmented core, the first guiding hole of the second guiding groove of the third segmented core, the second guiding hole of the second guiding groove of the fourth segmented core, the third guiding hole of the second guiding groove of the fifth segmented core, the first guiding hole of the first guiding groove of the sixth segmented core, and the second guiding hole of the first guiding groove of the seventh segmented core.

[0049] Thus, an inclined structure of the rotor core axially divided into seven is achieved.

[0050] In an embodiment of the present invention, when the nth segmented iron core is configured as the ninth segmented iron core, the guide pins are respectively inserted into the first guide hole of the third guide groove of the first segmented iron core, the second guide hole of the third guide groove of the second segmented iron core, the third guide hole of the third guide groove of the third segmented iron core, the first guide hole of the second guide groove of the fourth segmented iron core, the second guide hole of the second guide groove of the fifth segmented iron core, the third guide hole of the second guide groove of the sixth segmented iron core, the first guide hole of the first guide groove of the seventh segmented iron core, the second guide hole of the first guide groove of the eighth segmented iron core, and the third guide hole of the first guide groove of the ninth segmented iron core.

[0051] Thereby, an inclined structure of the rotor iron core axially divided into nine can be easily realized.

[0052] In an embodiment of the present invention, the internal angle A between the guide holes is calculated by dividing the inclination angle TA by the number TN - 1 obtained by subtracting 1 from the number TN of the segmented iron cores, that is, the angle A = TA / (TN - 1).

[0053] Thereby, a plurality of permanent magnets arranged axially apart are arranged to rotate by a small angle in the circumferential direction, so that the cogging torque generated by the permanent magnets can be effectively suppressed.

[0054] In an embodiment of the present invention, the first guide groove and the third guide groove are formed symmetrically with respect to a center line passing through the center of the second guide groove in the radial direction.

[0055] In an embodiment of the present invention, among the permanent magnets of each of the first segmented iron core to the nth segmented iron core, with a horizontal line passing through the axial center of the first segmented iron core to the nth segmented iron core as a reference, the permanent magnets of the segmented iron cores far from the horizontal line are arranged at intervals in the same circumferential direction to form a preset inclination angle.

[0056] According to such a configuration, when the rotor iron core has an odd number of segments, for example, including the first segmented iron core, the second segmented iron core, and the third segmented iron core, compared with the permanent magnet of the central second segmented iron core, the permanent magnets of the first segmented iron core and the second segmented iron core are arranged at intervals in the same circumferential direction by a preset angle.

[0057] Here, when the first segmented iron core, the second segmented iron core, and the third segmented iron core are combined in the up and down direction, the third segmented iron core has a shape that flips the first segmented iron core (a shape that flips the upper and lower surfaces).

[0058] In the case where the rotor core has an even number of segments, for example, including a first segmented core, a second segmented core, a third segmented core, and a fourth segmented core, based on the horizontal line passing through the axial center of the rotor core, the permanent magnets of the second core and the permanent magnets of the third core are arranged at the same position, and the permanent magnets of the first segmented core and the permanent magnets of the fourth segmented core are arranged to rotate a preset angle along the same circumferential direction.

[0059] In an embodiment of the present invention, the rotor core further includes a balance groove formed between the first group and the second group.

[0060] Thereby, it is possible to suppress the generation of rotational imbalance when the rotor core rotates.

[0061] In an embodiment of the present invention, the balance groove is configured to form a right angle with the second guiding groove of the first group and the second guiding groove of the second group, respectively.

[0062] Thereby, it is possible to further suppress the generation of rotational imbalance of the rotor core.

[0063] Here, the balance groove is formed to have the same shape and size as the second guiding groove.

[0064] Thereby, the balance groove can be easily fabricated.

[0065] In an embodiment of the present invention, the permanent magnet includes: a first magnet arranged along the circumferential direction of the rotor core; or a pair of second magnets arranged to be spaced apart from each other along the circumferential direction of the rotor core, and a preset interior angle is formed by the pair of second magnets.

[0066] Here, the permanent magnets are arranged such that different magnetic poles (N pole, S pole) are alternately formed along the circumferential direction.

[0067] The first magnet and the second magnet are formed in a plate-like rectangular parallelepiped shape.

[0068] In an embodiment of the present invention, the permanent magnet may include the first magnet.

[0069] Thereby, the air gaps of the permanent magnets can be arranged close to each other, so that the magnetic force can be increased.

[0070] In an embodiment of the present invention, the permanent magnet may include the second magnet.

[0071] Thereby, by increasing the usage amount of the permanent magnet, it is possible to increase the generation of magnetic flux.

[0072] In an embodiment of the present invention, the permanent magnet includes the first magnet and a pair of the second magnets. The first magnet is disposed between the pair of the second magnets in the circumferential direction, so that the permanent magnet is configured in a triangular shape.

[0073] Thereby, the usage amount of the permanent magnet is further increased, so that the output can be further increased.

[0074] In an embodiment of the present invention, magnetic isolation grooves are respectively provided at the end portions of the pair of the second magnets. The magnetic isolation grooves of the pair of the second magnets are formed parallel to the center line passing through the center of the magnetic pole in the radial direction.

[0075] In an embodiment of the present invention, the center of the second guiding groove is disposed on the center line of the magnetic pole on the radially outer side. The center of the first guiding groove is disposed at a position separated by a preset angle in one direction in the circumferential direction with respect to the center line of the magnetic pole on the radially outer side. The center of the second guiding groove is disposed at a position separated by a preset angle in the other direction in the circumferential direction with respect to the center line of the magnetic pole on the radially outer side.

[0076] Thereby, a rotor core in which the permanent magnet is configured to have an inclination angle, the magnetic steel plate has the same shape, and there are two or three segmented iron cores in the axial direction is realized.

[0077] According to another aspect of the present invention, there is provided a method for manufacturing a rotor of a motor, the rotor including: a rotating shaft; a rotor core including a first segmented core to an nth segmented core, each of the first segmented core to the nth segmented core including a plurality of stacked magnetic steel sheets, and each of the first segmented core to the nth segmented core being axially coupled to the rotating shaft; and permanent magnets, the permanent magnets being coupled to the first segmented core to the nth segmented core respectively to form a plurality of magnetic poles; the method for manufacturing the rotor including: a step of stamping a plurality of the magnetic steel sheets such that each of the plurality of magnetic steel sheets includes a rotating shaft hole for coupling the rotating shaft, a permanent magnet coupling portion for coupling the permanent magnet, and a guiding groove for inserting a guiding pin to guide the permanent magnets respectively provided in the first segmented core to the nth segmented core to form a preset inclination angle, and the guiding groove being radially provided inside the plurality of magnetic poles, the guiding groove including a first guiding groove, a second guiding groove, and a third guiding groove spaced apart in the circumferential direction, the first guiding groove, the second guiding groove, and the third guiding groove being respectively arranged at positions forming a preset angle with respect to the center of the magnetic pole on the radially outer side; a step of stacking a plurality of the magnetic steel sheets to respectively form the first segmented core to the nth segmented core; a step of coupling the permanent magnets to the first segmented core to the nth segmented core respectively; a step of axially coupling the guiding groove of the first segmented core to the guiding groove of the nth segmented core to the guiding pin such that the permanent magnets respectively provided in the first segmented core to the nth segmented core can rotate a preset angle in one direction or the other direction in the circumferential direction to form the inclination angle; and a step of coupling the rotating shaft to the rotating shaft holes of the first segmented core to the nth segmented core.

[0078] Thus, each of the magnetic steel sheets of the first segmented core to the nth segmented core has the same shape, so that the rotor core can be easily manufactured.

[0079] In addition, each of the permanent magnets of the first segmented core to the nth segmented core is arranged to form a preset inclination angle with respect to the axial direction, so that vibrations and noises caused by cogging torque can be suppressed.

[0080] Advantages of the Invention

[0081] As described above, according to an embodiment of the present invention, the rotor core includes a plurality of first segmented cores to an nth segmented core each having a plurality of magnetic steel plates and axially joined. Rotation shaft holes, permanent magnet joining portions, and guide grooves for inserting guide pins to guide the permanent magnets to form an inclination angle are provided in the plurality of magnetic steel plates. The guide grooves are provided inside the plurality of magnetic poles in the radial direction. The guide grooves include a first guide groove, a second guide groove, and a third guide groove separated in the circumferential direction. The first guide groove, the second guide groove, and the third guide groove are respectively arranged at positions forming a preset angle with respect to the center of the magnetic pole on the radially outer side, so that the shapes of the magnetic steel plates of the respective segmented cores of the rotor core can be made uniform.

[0082] In addition, the permanent magnets provided in the respective segmented cores of the rotor core are arranged to form the inclination angle with respect to the axial direction, so that vibrations and noises generated by cogging torque can be suppressed.

[0083] In addition, the guide grooves include: a first group including the first guide groove, the second guide groove, and the third guide groove; and a second group formed rotationally symmetric with respect to the center of the rotor core with the first group as a reference, so that the joining of the plurality of segmented cores of the rotor core can be smoothly achieved.

[0084] In addition, each of the guide holes of the first guide groove, the second guide groove, and the third guide groove includes a first guide hole and a second guide hole, so that the shapes of the magnetic steel plates of the rotor core having an even number of segments can be made uniform.

[0085] In addition, when the nth segmented core is configured as the second segmented core, the guide pins are respectively inserted into the first guide hole of the second guide groove of the first segmented core and the second guide hole of the second guide groove of the second segmented core, so that the shapes of the respective magnetic steel plates of the first segmented core and the second segmented core can be made uniform, and the respective permanent magnets can be arranged to form an inclination angle with respect to each other.

[0086] In addition, each of the guide holes of the first guide groove, the second guide groove, and the third guide groove has a first guide hole, a second guide hole, and a third guide hole, so that the magnetic steel plates of the rotor core having an even number of segments and an odd number of segments can be made uniform.

[0087] In addition, when the nth segmented core is configured as the third segmented core, the guide pins are respectively inserted into the first guide hole of the second guide groove of the first segmented core, the second guide hole of the second guide groove of the second segmented core, and the third guide hole of the second guide groove of the third segmented core, so that the shapes of the respective magnetic steel plates of the first segmented core, the second segmented core, and the third segmented core can be made uniform, and the respective permanent magnets can be arranged to form an inclination angle with respect to each other.

[0088] In addition, the inner angle A between the guide holes is set to an angle calculated by dividing the tilt angle TA by the number TN - 1 obtained by subtracting 1 from the number TN of the odd segments, so that the permanent magnets axially separated can be configured to form a preset tilt angle.

[0089] In addition, the first guide groove and the third guide groove are formed symmetrically with respect to a center line passing through the center of the second guide groove in the radial direction, so that when the first segmented iron core to the nth segmented iron core are axially joined, the permanent magnets respectively provided in the first segmented iron core to the nth segmented iron core can be configured to form a preset tilt angle.

[0090] In addition, in each of the permanent magnets of the first segmented iron core to the nth segmented iron core, with a horizontal line passing through the axial center of the first segmented iron core to the nth segmented iron core as a reference, the permanent magnets of the segmented iron cores away from the horizontal line are arranged at a preset angle in the same circumferential direction, so that the segmented iron cores arranged on one side and the segmented iron cores arranged on the other side with the horizontal line as a reference can have mutually inverted shapes.

[0091] In addition, the rotor core includes balance grooves formed between the first group and the second group, so that rotational imbalance generated when the rotor core rotates can be suppressed.

[0092] In addition, the balance grooves are configured to form right angles with the second guide grooves of the first group and the second guide grooves of the second group respectively, so that rotational imbalance generated when the rotor core rotates can be further effectively suppressed.

[0093] In addition, the center of the second guide groove is arranged on the center line of the magnetic pole on the radially outer side, the center of the first guide groove is arranged at a position separated by a preset angle in one circumferential direction from the center line of the magnetic pole on the radially outer side, and the center of the second guide groove is arranged at a position separated by a preset angle in the other circumferential direction from the center line of the magnetic pole on the radially outer side, so that the permanent magnets can be configured to form the tilt angle, and the magnetic steel plates of each of the segmented iron cores can have the same shape. Description of the Drawings

[0094] Figure 1 is a perspective view of a rotor of a motor according to an embodiment of the present invention.

[0095] Figure 2 is Figure 1 a side view of the rotor core.

[0096] Figure 3 is Figure 2 a top view of the rotor core.

[0097] Figure 4 is Figure 1 The top view of the magnetic steel plate.

[0098] Figure 5 is Figure 4 The enlarged view of the main part.

[0099] Figure 6 is the perspective view of the rotor of the motor according to another embodiment of the present invention.

[0100] Figure 7 is Figure 6 The side view of the rotor core.

[0101] Figure 8 is Figure 7 The top view of the rotor core.

[0102] Figure 9 is Figure 6 The top view of the magnetic steel plate.

[0103] Figure 10 is Figure 9 The enlarged view of the main part.

[0104] Figure 11 is the perspective view of the rotor of the motor according to yet another embodiment of the present invention.

[0105] Figure 12 is Figure 11 The top view of the magnetic steel plate of the rotor core.

[0106] Figure 13 is Figure 12 The enlarged view of the main part.

[0107] Figure 14 is the side view of the rotor of the motor according to another embodiment of the present invention.

[0108] Figure 15 is Figure 14 The top view of the magnetic steel plate of the rotor core.

[0109] Figure 16 is Figure 15 The enlarged view of the main part.

[0110] Figure 17 is a diagram for explaining the manufacturing method of the rotor of the motor according to an embodiment of the present invention. Detailed implementation manners

[0111] Hereinafter, embodiments disclosed in the present invention will be described in detail with reference to the accompanying drawings. In this specification, even if they are different embodiments, the same or similar reference numerals will be given to the same or similar structures, and their descriptions will be replaced by the initial description. Unless otherwise clearly specified in the context, the singular expressions used in this specification include plural expressions. In addition, when describing the embodiments disclosed in this specification, if it is determined that a detailed description of related well-known technologies may confuse the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, it should be noted that the drawings are only for easily understanding the embodiments disclosed in this specification and should not be construed as limiting the technical ideas disclosed in this specification by the drawings.

[0112] Figure 1 is a perspective view of a rotor of a motor according to an embodiment of the present invention, Figure 2 is Figure 1 a side view of the rotor core of Figure 3 is Figure 2 a top view of the rotor core of Figures 1 to 3 As shown in

[0113] The rotating shaft 110 is formed in a round bar shape, for example.

[0114] The rotor core 150 is formed in a cylindrical shape, for example.

[0115] The rotor core 150 includes a plurality of magnetic steel sheets 160.

[0116] The rotor core 150 includes a plurality of magnetic steel sheets 160 stacked axially and insulated from each other.

[0117] The rotor core 150 includes a plurality of segmented cores axially coupled to the rotating shaft 110.

[0118] The plurality of segmented cores can be formed in 2 to 9 segments, for example.

[0119] In this embodiment, the plurality of segmented cores include, for example, a first segmented core 150c1, a second segmented core 150c2, a third segmented core 150c3, a fourth segmented core 150c4, a fifth segmented core 150c5, a sixth segmented core 150c6, a seventh segmented core 150c7, an eighth segmented core 150c8, and a ninth segmented core 150c9.

[0120] Each of the plurality of segmented cores includes a plurality of magnetic steel sheets 160.

[0121] In this embodiment, each of the magnetic steel plates 160 of the first segmented iron core 150c1 to the ninth segmented iron core 150c9 has the same shape.

[0122] In this embodiment, the first segmented iron core 150c1 is arranged, for example, at one end (the lower end in the figure) of the rotor iron core 150 in the axial direction, and the ninth segmented iron core 150c9 is arranged at the other end (the upper end in the figure) of the rotor iron core 150.

[0123] Each of the plurality of segmented iron cores has a rotary shaft hole 161 to be able to accommodate the rotary shaft 110.

[0124] The rotary shaft hole 161 is formed to penetrate axially through the center of each of the plurality of segmented iron cores.

[0125] The rotor iron core 150 includes a plurality of magnetic poles 155.

[0126] The rotor iron core 150 is configured such that different magnetic poles 155 (N pole, S pole) are alternately arranged in the circumferential direction.

[0127] In this embodiment, the rotor iron core 150 has, for example, 8 poles.

[0128] In this embodiment, the case where the rotor iron core 150 has 8 poles is illustrated, but this is only an example and is not limited thereto.

[0129] The rotor iron core 150 includes, for example, permanent magnets 156 provided in each of the plurality of segmented iron cores.

[0130] The permanent magnets 156 are spaced apart in the circumferential direction of the rotor iron core 150 to form a plurality of the magnetic poles 155.

[0131] The permanent magnets 156 are coupled to each of the plurality of segmented iron cores.

[0132] Specifically, the permanent magnets 156 are provided in each of the first segmented iron core 150c1 to the ninth segmented iron core 150c9.

[0133] The permanent magnets 156 have a length corresponding to the axial length of each of the segmented iron cores.

[0134] The permanent magnets 156 are, for example, axially inserted and coupled to the respective segmented iron cores of the rotor iron core 150.

[0135] In this embodiment, the case where the permanent magnets 156 are axially inserted into the respective segmented iron cores of the rotor iron core 150 is illustrated, but this is only an example and is not limited thereto.

[0136] Although not specifically shown in the figure, the rotor core 150 may include permanent magnets 156 disposed (combined) on the outer peripheral surface of a plurality of the segmented cores. In this case, the permanent magnets 156 may be formed in a cylindrical shape or an arc shape.

[0137] The permanent magnet 156 is, for example, formed in a rectangular parallelepiped shape with a relatively thin thickness.

[0138] The permanent magnet 156 includes, for example, a plurality of first magnets 1561 arranged at intervals in the circumferential direction of the rotor core 150.

[0139] The permanent magnet 156 includes, for example, second magnets 1562 that are arranged at intervals in the circumferential direction and have a pair formed for each magnetic pole.

[0140] In this embodiment, the permanent magnet 156 is composed of 1 first magnet 1561 and 2 (1 pair) second magnets 1562 for each magnetic pole.

[0141] In this embodiment, 8 first magnets 1561 and 8 pairs of second magnets 1562 are required for the permanent magnet 156 in each segmented core.

[0142] The permanent magnets 156 of the first segmented core 150c1 to the ninth segmented core 150c9 are arranged to have a preset inclination angle θ with respect to the axial direction (vertical line).

[0143] The inclination angle θ can be set, for example, within a range of 1 degree to 11 degrees.

[0144] Specifically, taking the permanent magnet 156 of the fifth segmented core 150c5 as a reference, the permanent magnet 156 of the fourth segmented core 150c4 can be arranged to move a preset angle in one direction (right side in the figure) in the circumferential direction, and the permanent magnet 156 of the sixth segmented core 150c6 can be arranged to move a preset angle in the other direction (left side in the figure).

[0145] Similarly, compared with the permanent magnet 156 of the fourth segmented core 150c4, the permanent magnet 156 of the third segmented core 150c3 disposed below the fourth segmented core 150c4 is arranged to move a preset angle in the one direction (right side in the figure), and compared with the permanent magnet 156 of the sixth segmented core 150c6, the permanent magnet 156 of the seventh segmented core 150c7 disposed above the sixth segmented core 150c6 is arranged to move a preset angle in the other direction (left side in the figure).

[0146] According to the above method, with the fifth segmented iron core 150c5 as a reference, each permanent magnet 156 of the fourth segmented iron core 150c4, the third segmented iron core 150c3, the second segmented iron core 150c2, and the first segmented iron core 150c1 arranged below it is configured to sequentially move a preset angle A in the one direction (the right side in the figure), and each permanent magnet 156 of the sixth segmented iron core 150c6, the seventh segmented iron core 150c7, the eighth segmented iron core 150c8, and the ninth segmented iron core 150c9 arranged above the fifth segmented iron core 150c5 is configured to sequentially move a preset angle A in the other direction (the left side in the figure).

[0147] A straight line connecting the center of the permanent magnet 156 of the ninth segmented iron core 150c9 and the center of the permanent magnet 156 of the first segmented iron core 150c1 forms the inclination angle θ with respect to the straight line Lv in the axial direction of the rotor iron core 150.

[0148] Thereby, it is possible to significantly reduce the cogging torque acting between the permanent magnet 156 and the stator when the rotor iron core 150 rotates.

[0149] According to such a configuration, it is possible to significantly reduce the vibration and noise generated by the cogging torque when the rotor 100 rotates.

[0150] Thereby, during rotation, the rotor 100 achieves quiet operation.

[0151] On the other hand, in the present embodiment, the rotor iron core 150 has a plurality of guide grooves 167s for guiding each permanent magnet 156 of the segmented iron cores to form the inclination angle θ.

[0152] The plurality of guide grooves 167s include, for example, a first guide groove 167s1, a second guide groove 167s2, and a third guide groove 167s3 spaced apart in the circumferential direction.

[0153] The plurality of guide grooves 167s include, for example: a first group 167G1 including the first guide groove 167s1, the second guide groove 167s2, and the third guide groove 167s3; and a second group 167G2 including the first guide groove 167s1, the second guide groove 167s2, and the third guide groove 167s3 formed rotationally symmetrically with respect to each guide groove 167s of the first group 167G1 with the center of the rotor iron core 150 as a reference.

[0154] Thereby, it is possible to easily achieve the axial combination of the plurality of segmented iron cores.

[0155] Specifically, the second guide grooves 167s2 of the first group 167G1 and the second guide grooves 167s2 of the second group 167G2 are arranged facing each other in the up-down direction in the figure.

[0156] Specifically, for example, the first guide groove 167s1 of the first group 167G1 is formed on one side (the left side in the figure) of the second guide groove 167s2 in the figure, and the first guide groove 167s1 of the second group 167G2 is arranged on the other side (the right side in the figure) of the second guide groove 167s2 in the figure.

[0157] Conversely, the third guide groove 167s3 of the first group 167G1 is arranged on the other side (the right side in the figure) of the second guide groove 167s2 in the figure, and the third guide groove 167s3 of the second group 167G2 is arranged on one side (the left side in the figure) of the second guide groove 167s2 in the figure.

[0158] The rotor core 150 includes a balance groove 168 formed between the first group 167G1 and the second group 167G2.

[0159] Thereby, it is possible to suppress rotational imbalance caused by mass difference when the rotor 100 rotates.

[0160] The balance groove 168 can be formed, for example, in the same shape as the guide groove 167s.

[0161] The balance groove 168 can be arranged, for example, at positions perpendicular to the second guide grooves 167s2 of the first group 167G1 and the second guide grooves 167s2 of the second group 167G2, respectively.

[0162] Each of the plurality of guide grooves 167s includes, for example, guide holes 167h whose centers are spaced apart in the circumferential direction.

[0163] In this embodiment, a plurality of guide holes 167h of the plurality of guide grooves 167s can be formed.

[0164] In this embodiment, each of the plurality of guide holes 167h among the plurality of guide holes 167h of the plurality of guide grooves 167s includes a first guide hole 167h1, a second guide hole 167h2, and a third guide hole 167h3.

[0165] Here, the distance between the centers of the plurality of guide holes 167h is smaller than the diameter of the plurality of guide holes 167h.

[0166] That is, a part of the regions of the plurality of guide holes 167h overlap each other.

[0167] Figure 4 Yes Figure 1Top view of the magnetic steel plate, Figure 5 is Figure 4 an enlarged view of the main part. As Figure 4 and Figure 5 shown, the magnetic steel plate 160 is formed in a disc shape, for example. Here, the magnetic steel plate 160 has a relatively thin thickness of less than 1 mm.

[0168] A rotary shaft hole 161 for inserting the rotary shaft 110 is provided at the center of the magnetic steel plate 160.

[0169] The rotary shaft hole 161 is formed to penetrate the magnetic steel plate 160 in the axial direction.

[0170] A permanent magnet coupling portion 165 for coupling the permanent magnet 156 is provided on the magnetic steel plate 160.

[0171] In this embodiment, the permanent magnet coupling portion 165 is configured to allow the permanent magnet 156 to be axially inserted and coupled to the rotor core 150 (each segmented core).

[0172] The permanent magnet coupling portion 165 is formed to penetrate the magnetic steel plate 160 in the axial direction.

[0173] The permanent magnet coupling portion 165 includes, for example, a first magnet insertion portion 1651 for inserting the first magnet 1561.

[0174] The permanent magnet coupling portion 165 includes, for example, a second magnet insertion portion 1652 for inserting the second magnet 1562.

[0175] The first magnet insertion portion is formed such that both ends approach the circumference of the rotor core 150 (magnetic steel plate 160).

[0176] The second magnet insertion portion 1652 is formed such that one end approaches the circumference of the rotor core 150 (magnetic steel plate 160), and the other end faces the inside of the rotor core 150 (magnetic steel plate 160).

[0177] The second magnet insertion portion 1652 is configured such that the distance between the inner ends is closer than the distance between the outer ends, forming a "V" shape.

[0178] The first magnet insertion portion 1651 is disposed between the second magnet insertion portions 1652.

[0179] The first magnet insertion portion 1651 is formed symmetrically with respect to the center line connecting the center of the magnetic pole 155 and the center of the rotor core 150, for example.

[0180] The second magnet insertion part 1652 is formed symmetrically, for example, with respect to a center line connecting the center of the magnetic pole 155 and the center of the rotor core 150.

[0181] Flux barriers are respectively formed through both end portions of the first magnet insertion part 1651.

[0182] Flux barriers are respectively formed through both end portions of the second magnet insertion part 1652.

[0183] The flux barriers at the inner end portions of the second magnet insertion part 1652 are formed to extend along the center line.

[0184] The flux barriers inside the second magnet insertion part 1652 are formed to have relatively larger sizes compared with the outer flux barriers.

[0185] Accordingly, the magnetic force of the second magnet 1562 can be suppressed from moving toward the center side of the rotor core 150.

[0186] On the other hand, the plurality of guide grooves 167s include a first guide groove 167s1, a second guide groove 167s2, and a third guide groove 167s3 that are spaced apart in the circumferential direction.

[0187] In the present embodiment, the center of the second guide groove 167s2 may be formed on the center line connecting the center of the magnetic pole 155 and the center of the rotor core 150.

[0188] Specifically, the second guide groove 167s2 may be formed symmetrically with respect to the center line of the magnetic pole 155.

[0189] In addition, the first guide groove 167s1 and the second guide groove 167s2 may be formed symmetrically with respect to the center line of the magnetic pole 155.

[0190] The plurality of guide grooves 167s include a first guide hole 167h1, a second guide hole 167h2, and a third guide hole 167h3.

[0191] The centers of the first guide hole 167h1, the second guide hole 167h2, and the third guide hole 167h3 are spaced apart in the circumferential direction.

[0192] The centers of the first guide hole 167h1, the second guide hole 167h2, and the third guide hole 167h3 are respectively and spacedly arranged on the same circumference.

[0193] The center of the second guide hole 167h2 of the second guide groove 167s2 is disposed on the center line of the magnetic pole 155 that connects the center of the magnetic pole 155 and the center of the rotor core 150 (magnetic steel plate 160).

[0194] Here, the centers of the first guide hole 167h1 to the third guide hole 167h3 of each of the guide grooves 167s are shifted by a preset angle A.

[0195] The angle A between the centers of each of the guide holes 167h represents the interior angle between the first guide hole 167h1 and the second guide hole 167h2.

[0196] The interior angle A between each of the guide holes 167h is calculated, for example, by dividing the tilt angle TA of the permanent magnet 156 by the number TN - 1 obtained by subtracting 1 from the number TN of the segment cores, i.e., A = TA / (TN - 1).

[0197] In this embodiment, if the number TN of the segment cores is set to 9 and the tilt angle TA of the permanent magnet 156 is set to 8 degrees, the interior angle A of the guide hole 167h can be set to 8 / (9 - 1) = 1 degree.

[0198] That is, the interior angle between the first guide hole 167h1 and the second guide hole 167h2 is 1 degree, and the interior angle between the second guide hole 167h2 and the third guide hole 167h3 is 1 degree.

[0199] The first guide hole 167h1 is formed at a position shifted by 1 degree in the circumferential direction with respect to the second guide hole 167h2, and the third guide hole 167h3 is formed at a position shifted by 1 degree in the circumferential direction with respect to the second guide hole 167h2.

[0200] The center of the first guide groove 167s1 is formed at a position shifted by a preset angle with respect to the center line of the magnetic pole 155.

[0201] In this embodiment, the first guide groove 167s1 is formed at a position shifted by a preset angle in a circumferential direction (left side in the figure) from the center line of the second guide groove 167s2.

[0202] Specifically, the first guide groove 167s1 and the second guide groove 167s2 form a preset angle (interior angle).

[0203] The angle (interior angle) between the first guide groove 167s1 and the second guide groove 167s2 can be calculated by 360 degrees / P - N*A. Here, P is the number of magnetic poles 155 of the rotor, and N is the number of guide holes 167h.

[0204] The center line of the first guiding groove 167s1 and the center line of the second guiding groove 167s2 form an angle of 360 / 8 - 3*1 = 42 degrees.

[0205] The center line of the third guiding groove 167s3 is formed at a position that is moved by a preset angle (360 degrees / P - N * A) in the circumferential direction from the center line of the second guiding groove 167s2 toward the other direction (the right side in the figure).

[0206] Specifically, the center line of the third guiding groove 167s3 and the center line of the second guiding groove 167s2 form an angle of 360 / 8 - 3*1 = 42 degrees.

[0207] The second guiding hole 167h2 of the second guiding groove 167s2 is arranged at the center of the magnetic pole 155, so the center of the permanent magnet 156 can be arranged on the center line of the magnetic pole 155.

[0208] Since the first guiding hole 167h1 of the second guiding groove 167s2 is moved by a preset angle A in the circumferential direction toward one direction (the left side in the figure) with respect to the second guiding hole 167h2, the permanent magnet 156 is arranged at a position that is relatively moved in the circumferential direction toward the other direction (the right side in the figure) with the first guiding hole 167h1 as a reference.

[0209] Since the third guiding hole 167h3 of the third guiding groove 167s3 is moved by a preset angle A in the circumferential direction toward the other direction (the right side in the figure) with respect to the second guiding hole 167h2, the permanent magnet 156 is arranged at a position that is relatively moved in the circumferential direction toward one direction (the left side in the figure) with the third guiding hole 167h3 as a reference.

[0210] Since the center of the first guiding groove 167s1 is formed at a position that is moved by 3A in one direction (the right side in the figure) with respect to the center of the magnetic pole 155, and the first guiding hole 167h1, the second guiding hole 167h2, and the third guiding hole 167h3 are respectively formed at positions that are moved by an angle A, the center of the first guiding hole 167h1 of the first guiding groove 167s1 is formed at a position that is moved by 2A in the circumferential direction toward one direction (the right side in the figure) with respect to the center of the magnetic pole 155.

[0211] With the first guiding hole 167h1 of the first guiding groove 167s1 as a reference, the permanent magnet 156 on the radially outer side of the first guiding groove 167s1 is arranged at a position that is relatively moved by 2A in the circumferential direction toward the other direction (the left side in the figure).

[0212] Based on the second guiding hole 167h2 of the first guiding groove 167s1, the permanent magnet 156 on the radially outer side of the first guiding groove 167s1 is disposed at a position that relatively moves 3A in the circumferential direction toward the other direction (left side in the figure).

[0213] Based on the third guiding hole 167h3 of the first guiding groove 167s1, the permanent magnet 156 on the radially outer side of the first guiding groove 167s1 is disposed at a position that relatively moves 4A in the circumferential direction toward the other direction (left side in the figure).

[0214] On the other hand, since the third guiding groove 167s3 is formed at a position that moves 3A in the other direction (left side in the figure) relative to the center of the magnetic pole 155, and the first guiding hole 167h1, the second guiding hole 167h2, and the third guiding hole 167h3 of the third guiding groove 167s3 are respectively formed at positions that move A in the circumferential direction, the center of the third guiding hole 167h3 of the third guiding groove 167s3 is formed at a position that moves 2A in the other direction (left side in the figure) relative to the center of the magnetic pole 155.

[0215] Based on the third guiding hole 167h3 of the third guiding groove 167s3, the permanent magnet 156 on the radially outer side of the first guiding groove 167s1 is disposed at a position that relatively moves 2A in the circumferential direction toward one direction (right side in the figure).

[0216] Based on the second guiding hole 167h2 of the third guiding groove 167s3, the permanent magnet 156 on the radially outer side of the third guiding groove 167s3 is disposed at a position that relatively moves 3A in the circumferential direction toward one direction (right side in the figure).

[0217] Based on the third guiding hole 167h3 of the third guiding groove 167s3, the permanent magnet 156 on the radially outer side of the third guiding groove 167s3 is disposed at a position that relatively moves 4A in the circumferential direction toward one direction (right side in the figure).

[0218] With such a configuration, the first segmented iron core 150c1 to the ninth segmented iron core 150c9 can be axially stacked (laminated) by the guiding pins 180.

[0219] The two guiding pins 180 are formed to be accommodatable in the respective guiding holes 167h.

[0220] Guiding surfaces may be formed at the ends of the respective guiding pins 180.

[0221] The guiding surfaces may be configured such that the outer width gradually decreases in the protruding direction.

[0222] As a result, the combination of a plurality of the segmented iron cores and the guide pins 180 can be smoothly achieved.

[0223] The guide surface can be formed, for example, as a straight line in cross-section or a curve convex outward.

[0224] In the first segmented iron core 150c1, two guide pins 180 arranged facing each other are respectively inserted and combined into first guide holes 167h1 of a third guide groove 167s3.

[0225] In the second segmented iron core 150c2, the two guide pins 180 are respectively inserted and combined into second guide holes 167h2 of the third guide groove 167s3.

[0226] In the third segmented iron core 150c3, the two guide pins 180 are respectively inserted and combined into third guide holes 167h3 of the third guide groove 167s3.

[0227] In the fourth segmented iron core 150c4, the two guide pins 180 are respectively inserted and combined into first guide holes 167h1 of the second guide groove 167s2.

[0228] In the fifth segmented iron core 150c5, the two guide pins 180 are respectively inserted and combined into second guide holes 167h2 of the second guide groove 167s2.

[0229] In the sixth segmented iron core 150c6, two guide pins 180 arranged facing each other are respectively inserted and combined into third guide holes 167h3 of the second guide groove 167s2.

[0230] In the seventh segmented iron core 150c7, the two guide pins 180 are respectively inserted and combined into first guide holes 167h1 of a first guide groove 167s1.

[0231] In the eighth segmented iron core 150c8, the two guide pins 180 are respectively inserted and combined into second guide holes 167h2 of the first guide groove 167s1.

[0232] In the ninth segmented iron core 150c9, the two guide pins 180 are respectively inserted and combined into third guide holes 167h3 of the first guide groove 167s1.

[0233] According to such a configuration, with the permanent magnet 156 of the fifth segmented iron core 150c5 arranged at the center along the axial direction of the rotor iron core 150 as a reference, the permanent magnet 156 of the sixth segmented iron core 150c6 is arranged at a position rotated by a preset angle A in one direction (the left side in the figure) in the circumferential direction.

[0234] Similarly, the permanent magnet 156 of the seventh segmented iron core 150c7 is moved to the left by the angle A relative to the permanent magnet 156 of the sixth segmented iron core 150c6, and the permanent magnets 156 of the eighth segmented iron core 150c8 and the ninth segmented iron core 150c9 are also arranged at positions that are successively rotated and moved by the angle A.

[0235] Taking the permanent magnet 156 of the fifth segmented iron core 150c5 as a reference, the permanent magnet 156 of the fourth segmented iron core 150c4 is arranged at a position that is relatively rotated by the angle A in the other direction (the right side in the figure).

[0236] In addition, the permanent magnets 156 of the third segmented iron core 150c3, the second segmented iron core 150c2, and the first segmented iron core 150c1 are respectively arranged at positions that are successively relatively rotated by a preset angle A in the other direction (the right side in the figure).

[0237] Thus, the permanent magnets 156 of the first segmented iron core 150c1 to the ninth segmented iron core 150c9 are arranged to form the inclination angle θ with respect to the axial direction, so that the cogging torque generated when the rotor core 150 rotates can be significantly reduced.

[0238] Thus, the vibration and noise of the rotor caused by the cogging torque are reduced, so that silent operation can be achieved.

[0239] On the other hand, in this embodiment, although not specifically shown in the figure, by using the above-mentioned combination method of the 9-segment rotor core 150, the rotor core 150 can also have 2 to 8 segments. For example, when the rotor core 150 is composed of 2 segments, by inserting the above-mentioned guide pin 180 into the guide holes 167h of the guide grooves 167s of two axially adjacent segmented iron cores among the 9 segmented iron cores, first combining the lower segmented iron core and then combining the upper segmented iron core, the 2-segment rotor core 150 can be combined. Similarly, by using the combination order of 3 to 8 consecutive segmented iron cores in the above-mentioned 9-segment rotor core 150 to successively combine to the guide pin 180, the rotor cores 150 with segmented iron cores having 3 to 8 segments respectively can be stacked (combined).

[0240] Figure 6 It is a perspective view of the rotor of the motor according to another embodiment of the present invention. Figure 7 is Figure 6 a side view of the rotor core, Figure 8 is Figure 7 a top view of the rotor core. As Figures 6 to 8 shown, the rotor 100a of the motor in this embodiment includes a rotating shaft 110 and a rotor core 150a.

[0241] The rotating shaft 110 is formed, for example, in the shape of a round bar.

[0242] The rotor core 150a is formed, for example, in the shape of a cylinder.

[0243] A rotating shaft hole 161 into which the rotating shaft 110 can be inserted is provided in the center of the rotor core 150a.

[0244] The rotating shaft hole 161 is formed to penetrate the rotor core 150a in the axial direction.

[0245] The rotor core 150a includes a plurality of magnetic steel sheets 160a.

[0246] The rotor core 150a includes a plurality of segmented cores joined in the axial direction.

[0247] The plurality of segmented cores can be configured, for example, as an even number.

[0248] In the present embodiment, the plurality of segmented cores can be configured as two segments, four segments, or six segments.

[0249] In the present embodiment, the plurality of segmented cores include a first segmented core 150c1a, a second segmented core 150c2a, a third segmented core 150c3a, a fourth segmented core 150c4a, a fifth segmented core 150c5a, and a sixth segmented core 150c6a.

[0250] The rotor core 150a includes a plurality of magnetic poles 155.

[0251] In the present embodiment, the plurality of magnetic poles 155 are configured as eight poles.

[0252] The rotor core 150a includes permanent magnets 156 provided in each of the plurality of segmented cores.

[0253] The permanent magnets 156 are provided in each of the first segmented core 150c1a to the sixth segmented core 150c6a.

[0254] The permanent magnets 156 are, for example, axially inserted and joined to the respective segmented cores of the rotor core 150a.

[0255] The permanent magnets 156 are formed, for example, in the shape of a rectangular parallelepiped with a relatively thin thickness.

[0256] In the present embodiment, the case where the permanent magnets 156 are axially inserted and joined to the rotor core 150a is illustrated, but this is merely an example, and the permanent magnets 156 can also be joined to the outer peripheral surface of the rotor core 150a.

[0257] The permanent magnet 156 includes, for example, a first magnet 1561 arranged at intervals in the circumferential direction of the rotor core 150a.

[0258] The first magnet 1561 is arranged such that both ends thereof are close to the outer periphery of the rotor core 150a.

[0259] The permanent magnet 156 includes a pair of second magnets 1562 provided at each magnetic pole 155.

[0260] The second magnet 1562 is arranged such that one end (outer end) is close to the outer periphery of the rotor core 150a and the other end (inner end) is close to the center side of the rotor core 150a.

[0261] In the present embodiment, the permanent magnet 156 has eight first magnets 1561 and eight pairs of second magnets 1562 respectively provided in each segment core.

[0262] In the present embodiment, the first segment core 150c1a to the sixth segment core 150c6a are arranged at a preset inclination angle θ with respect to the axial direction.

[0263] Here, the inclination angle θ can be set, for example, in the range of 1 degree to 11 degrees.

[0264] In the present embodiment, the permanent magnets 156 of the first segment core 150c1a to the permanent magnets 156 of the sixth segment core 150c6a are arranged at positions where they are relatively displaced by a preset angle A in the circumferential direction with respect to the permanent magnets 156 of the segment cores adjacent in the axial direction.

[0265] Thus, the permanent magnets 156 of the first segment core 150c1a to the permanent magnets 156 of the sixth segment core 150c6a are arranged at a preset inclination angle θ with respect to the axial direction.

[0266] Thus, when the rotor core 150a rotates, generation of the cogging torque of the permanent magnet 156 can be significantly suppressed.

[0267] In addition, vibration and noise generated by the cogging torque can be suppressed.

[0268] In the present embodiment, the permanent magnet 156 of the third segment core 150c3a arranged at the center and the permanent magnet 156 of the fourth segment core 150c4a are arranged at positions displaced by a preset angle A / 2 in one direction (left side in the figure) and the other direction (right side in the figure) respectively with respect to the center line connecting the center of the magnetic pole and the center of the rotor core 150a.

[0269] The permanent magnet 156 of the fifth segmented iron core 150c5 is arranged at a position where it is relatively rotated by a preset angle A in a circumferential direction toward one direction (the left side in the figure) with respect to the permanent magnet 156 of the fourth segmented iron core 150c4a.

[0270] The permanent magnet 156 of the sixth segmented iron core 150c6a is arranged at a position where it is relatively rotated by a preset angle A in a circumferential direction toward one direction (the left side in the figure) with respect to the permanent magnet 156 of the fifth segmented iron core 150c5.

[0271] Conversely, the permanent magnet 156 of the second segmented iron core 150c2a is arranged at a position where it is relatively rotated by a preset angle A in a circumferential direction toward the other direction (the right side in the figure) with respect to the permanent magnet 156 of the third segmented iron core 150c3a.

[0272] In addition, the permanent magnet 156 of the first segmented iron core 150c1a is arranged at a position where it is relatively rotated by a preset angle A in a circumferential direction toward the other direction (the right side in the figure) with respect to the permanent magnet 156 of the second segmented iron core 150c2a.

[0273] On the other hand, in this embodiment, the rotor iron core 150a has a plurality of guide grooves 167s, and guide pins 180 that guide the permanent magnets 156 of the respective segmented iron cores to form the inclination angle θ are inserted into the plurality of guide grooves 167s.

[0274] The plurality of guide grooves 167s include, for example, a first guide groove 167s1, a second guide groove 167s2a, and a third guide groove 167s3a that are separated in the circumferential direction.

[0275] The plurality of guide grooves 167s include, for example: a first group 167G1 including the first guide groove 167s1, the second guide groove 167s2a, and the third guide groove 167s3a; and a second group 167G2 including the first guide groove 167s1, the second guide groove 167s2a, and the third guide groove 167s3a that are formed rotationally symmetrically with respect to each guide groove 167s of the first group 167G1 with the center of the rotor iron core 150a as a reference.

[0276] Thereby, axial coupling of the plurality of segmented iron cores can be easily achieved.

[0277] On the other hand, the rotor iron core 150a includes a balance groove 168 disposed between the first group 167G1 and the second group 167G2.

[0278] Thereby, rotational imbalance caused by mass difference during rotation of the rotor iron core 150a can be suppressed.

[0279] The balance groove 168 can be formed, for example, in the same shape as the guide grooves 167s of the first group 167G1 and the guide grooves 167s of the second group 167G2.

[0280] The balance groove 168 can be formed at a position perpendicular to the second guide grooves 167s2a of the first group 167G1 and the second guide grooves 167s2a of the second group 167G2.

[0281] The second guide grooves 167s2a of the first group 167G1, the second guide grooves 167s2a of the second group 167G2, and the balance groove 168 can be respectively arranged on the same circumference.

[0282] Figure 9 is Figure 6 a top view of the magnetic steel plate of Figure 10 is Figure 9 an enlarged view of the main part of Figure 9 and Figure 10 As shown in

[0283] A rotary shaft hole 161 is formed through the center of the magnetic steel plate 160a.

[0284] A permanent magnet coupling part 165 for coupling the permanent magnet 156 is provided on the magnetic steel plate 160a.

[0285] In this embodiment, the permanent magnet coupling part 165 is configured to allow the permanent magnet 156 to be inserted and coupled along the axial direction.

[0286] The permanent magnet coupling part 165 includes a first magnet insertion part 1651 for inserting the first magnet 1561.

[0287] The permanent magnet coupling part 165 includes a second magnet insertion part 1652 for inserting the second magnet 1562.

[0288] Magnetic isolation grooves 1653 are formed through both sides of the first magnet insertion part 1651.

[0289] Magnetic isolation grooves 1654 are respectively formed through both sides of the second magnet insertion part 1652.

[0290] The magnetic isolation grooves 1654 at the inner end of the second magnet insertion part 1652 have relatively larger dimensions compared with the magnetic isolation grooves 1654 on the outside.

[0291] The magnetic isolation grooves 1654 at the inner end of the second magnet insertion part 1652 respectively extend along the center line Lcm of the magnetic pole 155.

[0292] On the other hand, the plurality of the guide grooves 167s include a first guide groove 167s1a, a second guide groove 167s2a, and a third guide groove 167s3a that are circumferentially spaced apart.

[0293] In the present embodiment, the center of the second guide groove 167s2a may be disposed on the center line of the magnetic pole 155 that connects the center of the magnetic pole 155 and the center of the rotor core 150a.

[0294] Each of the plurality of guide grooves 167s includes a first guide hole 167h1 and a second guide hole 167h2 whose centers are circumferentially spaced apart.

[0295] Here, the center of the second guide groove 167s2a is disposed on the center line Lcm of the magnetic pole 155.

[0296] In the present embodiment, the centers of the first guide hole 167h1 and the second guide hole 167h2 of each of the guide grooves 167s are circumferentially moved by a preset angle A.

[0297] Here, the preset angle A represents the interior angle between the center O1 of the first guide hole 167h1 and the center O2 of the second guide hole 167h2.

[0298] The interior angle A between the centers of the respective guide holes 167h is calculated, for example, by dividing the tilt angle TA of the permanent magnet 156 by the number TN - 1 obtained by subtracting 1 from the number TN of the segment cores, that is, A = TA / (TN - 1).

[0299] Since the first guide hole 167h1 and the second guide hole 167h2 of the second guide groove 167s2a are circumferentially arranged at the preset angle A, the center line Lcm of the magnetic pole 155 passes through the center of the arc connecting the center of the first guide hole 167h1 and the center of the second guide hole 167h2.

[0300] The first guide hole 167h1 is moved by half A / 2 of the preset angle A in one direction (left side in the figure) with respect to the center line Lcm of the magnetic pole 155.

[0301] Conversely, the second guide hole 167h2 is moved by half A / 2 of the preset angle A in the other direction (right side in the figure) with respect to the center line of the magnetic pole 155.

[0302] The third guide groove 167s3a is formed at a position that is moved by a preset distance in one direction (left side in the figure) with respect to the center line Lcm of the magnetic pole 155.

[0303] Here, the center of the third guide groove 167s3a is formed at a position shifted by 3A / 2 with respect to the center line Lcm of the magnetic pole 155.

[0304] The first guide hole 167h1 of the third guide groove 167s3a is formed at a position shifted by A / 2 from the center of the third guide groove 167s3a in one direction (left side in the figure), and the second guide hole 167h2 of the third guide groove 167s3a is formed at a position shifted by A / 2 from the center of the third guide groove 167s3a in the other direction (right side in the figure).

[0305] Thus, the first guide hole 167h1 and the second guide hole 167h2 of the third guide groove 167s3a form the preset angle A in the circumferential direction.

[0306] In addition, the first guide groove 167s1a is formed at a position shifted by a preset distance in one direction (left side in the figure) with respect to the center line Lcm of the magnetic pole 155.

[0307] Here, the center (center line Lcs) of the first guide groove 167s1a is formed at a position shifted by 3A / 2 with respect to the center line Lcm of the magnetic pole 155.

[0308] The first guide hole 167h1 of the first guide groove 167s1a is formed at a position shifted by A / 2 from the center of the first guide groove 167s1a in one direction (left side in the figure), and the second guide hole 167h2 of the first guide groove 167s1a is formed at a position shifted by A / 2 from the center of the first guide groove 167s1a in the other direction (right side in the figure).

[0309] Thus, the first guide hole 167h1 and the second guide hole 167h2 of the first guide groove 167s1a form the preset angle A in the circumferential direction.

[0310] With such a configuration, when combining the first segmented iron core 150c1a to the sixth segmented iron core 150c6a, the two guide pins 180 are respectively combined with the first guide hole 167h1 of the third guide groove 167s3a of the first segmented iron core 150c1a.

[0311] Then, the second guide hole 167h2 of the third guide groove 167s3a of the second segmented iron core 150c2a is respectively combined with the two guide pins 180.

[0312] The first guide hole 167h1 of the second guide groove 167s2a of the third segmented iron core 150c3a is combined with the two guide pins 180.

[0313] Couple the second guiding hole 167h2 of the second guiding slot 167s2a of the fourth segmented iron core 150c4a with the two guiding pins 180.

[0314] Couple the first guiding hole 167h1 of the first guiding slot 167s1a of the fifth segmented iron core 150c5a with the two guiding pins 180.

[0315] Next, couple the second guiding hole 167h2 of the first guiding slot 167s1a of the sixth segmented iron core 150c6a with the two guiding pins 180.

[0316] Thereby, the permanent magnets 156 of the first segmented iron core 150c1a to the permanent magnets 156 of the sixth segmented iron core 150c6a are arranged to form the inclination angle θ with respect to the axial direction.

[0317] Thereby, it is possible to suppress the cogging torque generated when the rotor core 150a rotates.

[0318] In addition, the vibration and noise generated when the rotor core 150a rotates are suppressed, so that silent operation can be achieved.

[0319] Figure 11 It is a perspective view of a rotor of a motor according to another embodiment of the present invention. Figure 12 is Figure 11 a top view of the magnetic steel sheet of the rotor core of Figure 13 is Figure 12 a main part enlarged view of Figures 11 to 13 As shown, the rotor 100b of the motor in this embodiment includes a rotating shaft 110 and a rotor core 150b.

[0320] The rotating shaft 110 is formed in a round bar shape, for example.

[0321] The rotor core 150b is formed in a cylindrical shape, for example.

[0322] The rotor core 150b includes a plurality of magnetic steel sheets 160b.

[0323] The rotor core 150b includes a plurality of segmented iron cores axially coupled to the rotating shaft 110.

[0324] Each of the plurality of segmented iron cores includes a plurality of magnetic steel sheets 160b stacked in insulation.

[0325] In this embodiment, the plurality of segmented iron cores are configured in three segments.

[0326] The rotor core 150b includes a first segmented iron core 150c1b, a second segmented iron core 150c2b, and a third segmented iron core 150c3b.

[0327] In this embodiment, an example is given where the rotor core 150b is configured in three segments, but this is merely an example, and it may also be configured in two segments.

[0328] The magnetic steel plates 160b of the first segmented core 150c1b, the magnetic steel plates 160b of the second segmented core 150c2b, and the magnetic steel plates 160b of the third segmented core 150c3b have the same shape.

[0329] A rotating shaft hole 161 is formed through the center of the rotor core 150b.

[0330] The rotor core 150b has a plurality of magnetic poles 155 (N poles, S poles).

[0331] The plurality of magnetic poles 155 are configured such that different magnetic poles 155 (N poles, S poles) are alternately formed in the circumferential direction.

[0332] In this embodiment, an example is given where the plurality of magnetic poles 155 are composed of eight poles, but this is merely an example and is not limited thereto.

[0333] Each of the plurality of magnetic poles 155 has a permanent magnet 156.

[0334] The permanent magnet 156 includes first magnets 1561 arranged at intervals in the circumferential direction.

[0335] The permanent magnet 156 includes second magnets 1562 arranged in pairs for each magnetic pole 155.

[0336] In this embodiment, the permanent magnets 156 of each of the segmented cores are arranged at a preset inclination angle θ with respect to the axial direction.

[0337] The inclination angle θ can be set, for example, in the range of 1 degree to 11 degrees.

[0338] In this embodiment, the permanent magnets 156 of the first segmented core 150c1b and the permanent magnets 156 of the second segmented core 150c2b can be arranged at a preset angle interval in the circumferential direction, and the permanent magnets 156 of the second segmented core 150c2b and the permanent magnets 156 of the third segmented core 150c3b can be arranged at the preset angle interval.

[0339] As Figure 12 shown, the magnetic steel plate 160b has a disc shape.

[0340] The rotating shaft hole 161 is formed through the center of the magnetic steel plate 160b.

[0341] A plurality of permanent magnet coupling portions 165 spaced apart in the circumferential direction are formed through the magnetic steel plate 160b.

[0342] Permanent magnet coupling portions 165 for coupling the permanent magnets 156 are respectively provided on the respective segment cores of the rotor core 150b.

[0343] In the present embodiment, the permanent magnet coupling portion 165 is configured to axially insert and couple the permanent magnet 156.

[0344] The permanent magnet coupling portion 165 includes a first magnet insertion portion 1651 for axially inserting and coupling the first magnet 1561.

[0345] The permanent magnet coupling portion 165 includes a second magnet insertion portion 1652 for axially inserting and coupling the second magnet 1562.

[0346] The second magnet insertion portion 1652 has a "V" shape in which the outer end is more open in the circumferential direction than the inner end.

[0347] On the other hand, a guide groove 167sb is provided in the rotor core 150b, and the guide pin 180 can be inserted into the guide groove 167sb to guide the permanent magnets 156 of the respective segment cores to form a preset inclination angle θ.

[0348] In the present embodiment, the guide groove 167sb includes a guide hole 167h having a circular cross section so that the guide pin 180 can be accommodated inside the guide groove 167sb.

[0349] The guide grooves 167sb are respectively formed through in the axial direction so that the guide pins 180 can be inserted axially.

[0350] The guide grooves 167sb are provided radially inside the plurality of magnetic poles 155.

[0351] The guide groove 167sb includes a first guide groove 167s1b, a second guide groove 167s2b, and a third guide groove 167s3b spaced apart in the circumferential direction.

[0352] In the present embodiment, the first guide groove 167s1b, the second guide groove 167s2b, and the third guide groove 167s3b respectively have one guide hole 167h.

[0353] The first guide groove 167s1b, the second guide groove 167s2b, and the third guide groove 167s3b are respectively arranged at positions forming a preset angle with respect to the center of the magnetic pole 155 on the outer side in the radial direction.

[0354] The guiding groove 167sb includes: a first group 167G1 having the first guiding groove 167s1b, the second guiding groove 167s2b, and the third guiding groove 167s3b; and a second group 167G2 that is rotationally symmetric with respect to the center O of the rotor core 150 with the first group 167G1 as a reference.

[0355] The second group 167G2 includes the first guiding groove 167s1b, the second guiding groove 167s2b, and the third guiding groove 167s3b that are rotationally symmetric with respect to the center O of the rotor core 150 with the first guiding groove 167s1b, the second guiding groove 167s2b, and the third guiding groove 167s3b of the first group 167G1 as a reference.

[0356] The rotor core 150b includes a balance groove 168 formed between the first group 167G1 and the second group 167G2 of the guiding groove 167sb.

[0357] Thus, it is possible to suppress rotational imbalance caused by a mass difference when the rotor core 150b rotates.

[0358] The balance groove 168 can be arranged, for example, at a position forming a right angle with the second guiding groove 167s2b of the first group 167G1 and the second guiding groove 167s2b of the second group 167G2.

[0359] The balance groove 168 can have, for example, the same shape as the second guiding groove 167s2b.

[0360] On the other hand, specifically, the center of the second guiding groove 167s2b is located, for example, on the center line Lcm of the outer magnetic pole 155 arranged radially.

[0361] The center (center line Lcs) of the second guiding groove 167s2b can be arranged on the center line Lcm of the outer magnetic pole 155 on the radially outer side of the second guiding groove 167s2b.

[0362] The first guiding groove 167s1b can be formed at a position shifted by a preset angle in one direction (left side in the figure) in the circumferential direction with the second guiding groove 167s2b as a reference.

[0363] The third guiding groove 167s3b can be formed at a position shifted by a preset angle in the other direction (right side in the figure) in the circumferential direction with the second guiding groove 167s2b as a reference.

[0364] Here, the guiding hole 167h of the third guiding groove 167s3b is formed at a position shifted by a preset angle A in one direction (left side in the figure) from the center line Lcm of the outer magnetic pole 155 on the radially outer side.

[0365] The center line Lcm of the magnetic pole 155 on the radially outer side of the third guide groove 167s3b is arranged at a position shifted by the angle A in the circumferential direction from the center of the third guide groove 167s3b toward the other direction (the right side in the figure).

[0366] The guide hole 167h of the first guide groove 167s1b is formed at a position shifted by a preset angle A in the other direction (the right side in the figure) from the center line Lcm of the magnetic pole 155 on the radially outer side.

[0367] The center line Lcm of the magnetic pole 155 on the radially outer side of the first guide groove 167s1b is arranged at a position shifted by the angle A in the circumferential direction from the center (center line Lcs) of the first guide groove 167s1b toward one direction (the left side in the figure).

[0368] Here, the angle A is calculated, for example, by dividing the tilt angle TA of the permanent magnet 156 by the number TN - 1 obtained by subtracting 1 from the number TN of the segmented iron cores, that is, A = TA / (TN - 1).

[0369] With such a configuration, when the first segmented iron core 150c1b, the second segmented iron core 150c2b, and the third segmented iron core 150c3b are to be axially joined, first, the first guide grooves 167s1b of the first group 167G1 and the second group 167G2 of the first segmented iron core 150c1b are respectively joined to the two guide pins 180.

[0370] Next, the second guide grooves 167s2b of the second segmented iron core 150c2b are respectively joined to the two guide pins 180.

[0371] Next, the third guide grooves 167s3b of the third segmented iron core 150c3b are respectively joined to the two guide pins 180.

[0372] As a result, the permanent magnets 156 of the first segmented iron core 150c1b, the permanent magnets 156 of the second segmented iron core 150c2b, and the permanent magnets 156 of the third segmented iron core 150c3b are respectively arranged to form the tilt angle θ with respect to the axis.

[0373] Figure 14 is a side view of the rotor of the motor according to another embodiment of the present invention, Figure 15 is Figure 14 a top view of the magnetic steel sheet of the rotor core of Figure 16 is Figure 15 a main part enlarged view of Figures 14 to 16 As shown, the rotor 100c of the motor of the present embodiment includes a rotating shaft 110 and a rotor core 150c.

[0374] The rotating shaft 110 has, for example, a round bar shape.

[0375] The rotor core 150c has, for example, a cylindrical shape.

[0376] The rotor core 150c includes a plurality of segmented cores axially joined.

[0377] In the present embodiment, the plurality of segmented cores include a first segmented core 150c1c, a second segmented core 150c2c, a third segmented core 150c3c, and a fourth segmented core 150c4c.

[0378] The rotor core 150c includes a plurality of magnetic steel sheets 160.

[0379] In the present embodiment, an example is shown in which the rotor core 150c is composed of four segments (the first segmented core 150c1c, the second segmented core 150c2c, the third segmented core 150c3c, and the fourth segmented core 150c4c), but this is merely an example and is not limited thereto.

[0380] The rotor core 150c includes a plurality of magnetic poles 155 (N poles, S poles) spaced apart in the circumferential direction.

[0381] A plurality of the magnetic poles 155 are alternately arranged with different magnetic poles 155 (N poles, S poles) in the circumferential direction of the rotor core 150c.

[0382] In the present embodiment, the plurality of magnetic poles 155 are configured as 8 poles.

[0383] A plurality of the magnetic poles 155 each have a permanent magnet 156.

[0384] The permanent magnet 156 includes, for example, a first magnet 1561 whose both ends are disposed close to the circumference of the rotor core 150c.

[0385] The permanent magnet 156 includes, for example, a pair of second magnets 1562 provided in each magnetic pole 155.

[0386] The second magnet 1562 is configured in a "V" shape, for example.

[0387] On the other hand, in the present embodiment, the rotor core 150c is configured such that, among the permanent magnets 156 of the plurality of segmented cores, with a horizontal line passing through the axial center of the plurality of segmented cores as a reference, the permanent magnets 156 of the segmented cores away from the horizontal line form a preset inclination angle θ in the same circumferential direction with respect to each other.

[0388] Specifically, in the present embodiment, the rotor core 150c includes a first segmented core 150c1c to a fourth segmented core 150c4c and is configured in four segments. Therefore, the axial center of the rotor core 150c is formed in the region where the second segmented core 150c2c and the third segmented core 150c3c are in contact with each other. Thus, the horizontal line passing through the axial center is arranged to pass through the contact surface between the second segmented core 150c2c and the third segmented core 150c3c.

[0389] The permanent magnets 156 of the first segmented core 150c1c and the permanent magnets 156 of the second segmented core 150c2c are arranged to form the inclination angle θ.

[0390] The permanent magnets 156 of the third segmented core 150c3c and the permanent magnets 156 of the fourth segmented core 150c4c are arranged to form the inclination angle θ.

[0391] Here, the permanent magnets 156 of the first segmented core 150c1c are arranged to move in a circumferential direction in one direction (left side in the figure) with respect to the permanent magnets 156 of the second segmented core 150c2c.

[0392] In addition, the permanent magnets 156 of the fourth segmented core 150c4c are arranged to move in a circumferential direction in one direction (left side in the figure) with respect to the permanent magnets 156 of the third segmented core 150c3c.

[0393] On the other hand, in the present embodiment, the respective magnetic steel plates 160 of the first segmented core 150c1c, the second segmented core 150c2c, the third segmented core 150c3c, and the fourth segmented core 150c4c are formed in the same shape.

[0394] A rotation shaft hole 161 for inserting the rotation shaft 110 is formed through the center of the magnetic steel plate 160.

[0395] A permanent magnet coupling portion 165 for axially coupling the permanent magnets 156 is provided on the magnetic steel plate 160.

[0396] The permanent magnet coupling portion 165 includes, for example: a first magnet insertion portion 1651 for axially inserting the first magnet 1561; and a second magnet insertion portion 1652 for axially inserting the second magnet 1562.

[0397] On the other hand, a guide groove 167sc is provided on the magnetic steel plate 160 so as to insert a guide pin 180 to guide the permanent magnets 156 to be arranged at the inclination angle.

[0398] The guide groove 167sc is provided inside the magnetic pole 155 in the radial direction of the rotor core 150c.

[0399] The guide groove 167sc is disposed radially outside the rotary shaft hole 161 along the rotor core 150c.

[0400] The guide groove 167sc includes a first guide groove 167s1c, a second guide groove 167s2c, and a third guide groove 167s3c that are circumferentially spaced apart.

[0401] In the present embodiment, an example is shown in which the first guide groove 167s1c, the second guide groove 167s2c, and the third guide groove 167s3c each have one guide hole. However, as described with reference to Figures 6 to 10 the first guide groove 167s1c, the second guide groove 167s2c, and the third guide groove 167s3c may include a first guide hole and a second guide hole, or as described with reference to Figures 1 to 5 they may also include a first guide hole, a second guide hole, and a third guide hole.

[0402] The center of the second guide groove 167s2c is disposed on the center line Lcm of the magnet pole 155 disposed radially outside.

[0403] The first guide groove 167s1c is, for example, circumferentially spaced apart in one direction (left side in the figure) with respect to the second guide groove 167s2 as a reference.

[0404] Here, the first guide groove 167s1c is formed to be spaced apart by a preset angle A in the other direction (right side in the figure) from the center line of the magnet pole 155 disposed radially outside.

[0405] The third guide groove 167s3c is, for example, formed to be circumferentially spaced apart in the other direction (right side in the figure) with respect to the second guide groove 167s2c as a reference.

[0406] Here, the third guide groove 167s3c is formed to be spaced apart by a preset angle A in one direction (left side in the figure) from the center line of the magnet pole 155 disposed radially outside.

[0407] Here, the preset angle A is calculated by dividing the inclination angle TA of the permanent magnet 156 of the first segmented core 150c1c and the permanent magnet 156 of the second segmented core 150c2c by the value TN - 1 obtained by subtracting 1 from the number TN of the first segmented core 150c1c and the second segmented core 150c2c, that is, A = TA / (TN - 1). When the inclination angle TA is 4 degrees, the preset angle A is calculated as 4 / (2 - 1) = 4 degrees.

[0408] On the other hand, the third segmented iron core 150c3c and the fourth segmented iron core 150c4c have shapes that flip the upper and lower surfaces of the first segmented iron core 150c1c and the third segmented iron core 150c3c.

[0409] Here, the two guide pins 180 are respectively coupled to the first guide grooves 167s1c of the first segmented iron core 150c1c, and the second guide grooves 167s2c of the second segmented iron core 150c2c are respectively coupled to the two guide pins 180.

[0410] Thus, the permanent magnets 156 of the first segmented iron core 150c1c are arranged at the inclination angle A in one direction (the left direction in the figure) in the circumferential direction with respect to the permanent magnets 156 of the second segmented iron core 150c2c as a reference.

[0411] Next, the second guide grooves 167s2c of the third segmented iron core 150c3c are coupled to the two guide pins 180, and the two guide pins 180 are coupled to the first guide grooves 167s1c of the fourth segmented iron core 150c4c.

[0412] Thus, the permanent magnets 156 of the third segmented iron core 150c3c are arranged on the same line as the permanent magnets 156 of the second segmented iron core 150c2c in the axial direction, and the permanent magnets 156 of the fourth segmented iron core 150c4c are arranged at the inclination angle A in one direction (the left in the figure) in the circumferential direction with respect to the permanent magnets 156 of the third segmented iron core 150c3c as a reference.

[0413] In this embodiment, an example is given where each of the first guide groove 167s1c, the second guide groove 167s2, and the third guide groove 167s3 has one guide hole. However, as described with reference to Figures 6 to 10 each of the guide grooves 167sc may also have the aforementioned first guide hole and second guide hole. When each of the guide grooves 167sc has the first guide hole and the second guide hole, by configuring the first segmented iron core to the sixth segmented iron core as described above, and arranging the seventh segmented iron core to the twelfth segmented iron core on the upper side of the sixth segmented iron core after flipping the upper and lower sides in the same order as the first segmented iron core to the sixth segmented iron core, the rotor core can be configured into 12 segments.

[0414] In addition, as described with reference to Figures 1 to 5As described, each of the first guide groove 167s1c, the second guide groove 167s2c, and the third guide groove 167s3c may also have a first guide hole, a second guide hole, and a third guide hole. In the case where each of the guide grooves 167sc has a first guide hole, a second guide hole, and a third guide hole, by combining the first to ninth segmented iron cores in the aforementioned method, and flipping the upper and lower sides of the tenth to eighteenth segmented iron cores after combining them in the same order as the first to ninth segmented iron cores and arranging them on the upper side of the ninth segmented iron core, the rotor core can be configured into 18 segments.

[0415] Figure 17 is a diagram for explaining a method of manufacturing a rotor of a motor according to an embodiment of the present invention. As Figures 1 to 5 , Figure 17 shown, the method of manufacturing a rotor according to an embodiment of the present invention includes: a step (S110) of stamping a plurality of magnetic steel sheets 160; a step (S120) of stacking the plurality of magnetic steel sheets 160 to respectively form a first segmented iron core 150c1 to an nth segmented iron core; a step (S130) of combining a permanent magnet 156 to the first segmented iron core 150c1 to the nth segmented iron core; a step (S140) of respectively combining the guide grooves 167s of the first segmented iron core 150c1 to the guide grooves 167s of the nth segmented iron core to a guide pin 180; and a step (S150) of combining a rotating shaft 110 to the first segmented iron core 150c1 to the nth segmented iron core.

[0416] The method of manufacturing a rotor of a motor according to the present embodiment may further include a step (S160) of separating the guide pin 180 from the first segmented iron core 150c1 to the nth segmented iron core after the step (S150) of combining the rotating shaft 110 to the first segmented iron core 150c1 to the nth segmented iron core.

[0417] Referring together to Figures 1 to 5 , the rotor 100 of the motor according to the present embodiment includes a rotating shaft 110 and a rotor core 150.

[0418] The rotor core 150 includes, for example, a first segmented iron core 150c1 to a ninth segmented iron core 150c9.

[0419] The rotor core 150 includes a plurality of magnetic poles 155 formed alternately in the circumferential direction.

[0420] Each of the plurality of magnetic poles 155 includes, for example, a first magnet 1561 and a second magnet 1562 formed in a pair for each pole.

[0421] Each of the first segmented iron core 150c1 to the ninth segmented iron core 150c9 includes the first magnet 1561 and a second magnet.

[0422] Each of the first segmented iron core 150c1 to the ninth segmented iron core 150c9 includes a plurality of magnetic steel plates 160 having the same shape.

[0423] The permanent magnets 156 of the first segmented iron core 150c1 to the permanent magnets 156 of the ninth segmented iron core 150c9 are configured to form a preset inclination angle θ with respect to the axial direction.

[0424] The plurality of magnetic steel plates 160 include: a rotation shaft hole 161 into which the rotation shaft 110 is inserted; a permanent magnet coupling portion 165 to which the permanent magnet 156 is coupled; and a guide groove 167s into which a guide pin 180 is inserted to guide the permanent magnet 156 of each segmented iron core to form the inclination angle θ.

[0425] The guide groove 167s is provided inside the magnetic pole 155 along the radial direction of the rotor iron core 150.

[0426] The guide groove 167s includes a first guide groove 167s1, a second guide groove 167s2, and a third guide groove 167s3 that are spaced apart in the circumferential direction.

[0427] The guide groove 167s includes: a first group 167G1 including the first guide groove 167s1, the second guide groove 167s2, and the third guide groove 167s3; and a second group 167G2 including the first guide groove 167s1, the second guide groove 167s2, and the third guide groove 167s3 that are formed rotationally symmetric with respect to the center of the rotor iron core 150.

[0428] Each of the first guide groove 167s1, the second guide groove 167s2, and the third guide groove 167s3 includes a first guide hole, a second guide hole, and a third guide hole so that the guide pin 180 can be inserted respectively.

[0429] The first guide hole, the second guide hole, and the third guide hole are formed in a shape that partially overlaps each other in the circumferential direction.

[0430] The center of the first guide hole and the center of the second guide hole, and the center of the second guide hole and the center of the third guide hole are separated by a preset angle A.

[0431] In this embodiment, it is illustrated by way of example that each of the first guide groove 167s1, the second guide groove 167s2, and the third guide groove 167s3 includes a first guide hole, a second guide hole, and a third guide hole. However, as shown inFigures 6 to 10 As described, each of the first guide groove 167s1, the second guide groove 167s2, and the third guide groove 167s3 may also include a first guide hole and a second guide hole. Additionally, as referred to Figures 11 to 16 As described, each of the first guide groove 167s1, the second guide groove 167s2, and the third guide groove 167s3 may also include one guide hole.

[0432] After stamping each of the plurality of magnetic steel plates 160, the plurality of magnetic steel plates 160 are stacked to form the first segmented iron core 150c1 to the nth segmented iron core (the ninth segmented iron core 150c9).

[0433] Permanent magnets 156 are respectively coupled to the respective permanent magnet coupling portions 165 of the first segmented iron core 150c1 to the nth segmented iron core (the ninth segmented iron core 150c9).

[0434] On the other hand, when axially stacking (coupling) the first segmented iron core 150c1 to the nth segmented iron core, the guide pins 180 are used. The guide pins 180 include two guide pins 180 disposed opposite to each other at positions forming 180 degrees with each other.

[0435] The first segmented iron core 150c1 to the nth segmented iron core can use the first to third guide holes of the first guide groove 167s1 to the third guide groove 167s3 to dispose the permanent magnet 156 at the inclination angle θ.

[0436] After the axial coupling of the first segmented iron core 150c1 to the nth segmented iron core (the ninth segmented iron core 150c9) is completed, the rotating shaft 110 is coupled to the rotating shaft hole 161.

[0437] Herein, the rotating shaft 110 may be press-fitted and coupled to the rotating shaft hole 161 of the first segmented iron core 150c1 to the nth segmented iron core (the ninth segmented iron core 150c9).

[0438] After the rotating shaft 110 is coupled to the first segmented iron core 150c1 to the nth segmented iron core (the ninth segmented iron core 150c9), the two guide pins 180 are separated from the first segmented iron core 150c1 to the nth segmented iron core (the ninth segmented iron core 150c9).

[0439] Above, specific embodiments of the present invention have been illustrated and described. However, the present invention can be implemented in various forms without departing from its idea or essential features. Therefore, the embodiments described above should not be limited by the specific content for implementing the invention.

[0440] In addition, even if embodiments not specifically listed in the above detailed description are concerned, the embodiments should be broadly interpreted within the scope of the technical idea defined in the appended claims. Moreover, all changes and modifications within the technical scope of the above claims and equivalent thereto should be included in the appended claims.

Claims

1. A rotor of a motor, wherein, The rotor includes: a rotating shaft; a rotor core including a first segmented core to an nth segmented core, each of the first segmented core to the nth segmented core includes a plurality of stacked magnetic steel sheets, and each of the first segmented core to the nth segmented core is axially coupled to the rotating shaft; and permanent magnets, each of the first segmented core to the nth segmented core is coupled with the permanent magnets to form a plurality of magnetic poles; Each of the plurality of magnetic steel sheets includes: a rotating shaft hole for coupling the rotating shaft; a permanent magnet coupling portion for coupling the permanent magnet; and a guiding groove for inserting a guiding pin, the guiding pin guiding the permanent magnets provided in each of the first segmented core to the nth segmented core to form a preset inclination angle; The guiding groove is radially provided inside the plurality of magnetic poles; The guiding groove includes a first guiding groove, a second guiding groove, and a third guiding groove spaced apart in the circumferential direction; The first guiding groove, the second guiding groove, and the third guiding groove are respectively arranged at positions forming a preset angle with respect to the center of the magnetic pole on the radially outer side.

2. The rotor of the motor according to claim 1, wherein, The guiding groove includes: a first group including the first guiding groove, the second guiding groove, and the third guiding groove; and a second group formed rotationally symmetric with the first group with respect to the center of the rotor core.

3. The rotor of the motor according to claim 2, wherein, Each guiding hole of the first guiding groove, the second guiding groove, and the third guiding groove includes a first guiding hole and a second guiding hole.

4. The rotor of the motor according to claim 3, wherein, When the nth segmented core is configured as the second segmented core, the guiding pins are respectively inserted into the first guiding hole of the second guiding groove of the first segmented core and the second guiding hole of the second guiding groove of the second segmented core.

5. The rotor of the motor according to claim 3, wherein, When the nth segmented core is configured as the fourth segmented core, the guiding pins are respectively coupled to the second guiding hole of the third guiding groove of the first segmented core, the first guiding hole of the second guiding groove of the second segmented core, the second guiding hole of the second guiding groove of the third segmented core, and the first guiding hole of the first guiding groove of the fourth segmented core.

6. The rotor of the motor according to claim 3, wherein, When the nth segmented core is configured as the sixth segmented core, the guiding pins are respectively coupled to the first guiding hole of the third guiding groove of the first segmented core, the second guiding hole of the third guiding groove of the second segmented core, the first guiding hole of the second guiding groove of the third segmented core, the second guiding hole of the second guiding groove of the fourth segmented core, the first guiding hole of the first guiding groove of the fifth segmented core, and the second guiding hole of the first guiding groove of the sixth segmented core.

7. The rotor of the motor according to claim 2, wherein, Each guiding hole of the first guiding groove, the second guiding groove, and the third guiding groove includes a first guiding hole, a second guiding hole, and a third guiding hole.

8. The rotor of the motor according to claim 7, wherein, When the nth segmented core is configured as the third segmented core, the guiding pins are respectively inserted into the first guiding hole of the second guiding groove of the first segmented core, the second guiding hole of the second guiding groove of the second segmented core, and the third guiding hole of the second guiding groove of the third segmented core.

9. The rotor of the motor according to claim 7, wherein, When the nth segmented iron core is configured as the fifth segmented iron core, the guide pins are respectively inserted into the third guide holes of the third guide grooves of the first segmented iron core, the first guide holes of the second guide grooves of the second segmented iron core, the second guide holes of the second guide grooves of the third segmented iron core, the third guide holes of the second guide grooves of the fourth segmented iron core, and the first guide holes of the first guide grooves of the fifth segmented iron core.

10. The rotor of the motor according to claim 7, wherein, When the nth segmented iron core is configured as the seventh segmented iron core, the guide pins are respectively inserted into the second guide holes of the third guide grooves of the first segmented iron core, the third guide holes of the third guide grooves of the second segmented iron core, the first guide holes of the second guide grooves of the third segmented iron core, the second guide holes of the second guide grooves of the fourth segmented iron core, the third guide holes of the second guide grooves of the fifth segmented iron core, the first guide holes of the first guide grooves of the sixth segmented iron core, and the second guide holes of the first guide grooves of the seventh segmented iron core.

11. The rotor of the motor according to claim 7, wherein, When the nth segmented iron core is configured as the ninth segmented iron core, the guide pins are respectively inserted into the first guide holes of the third guide grooves of the first segmented iron core, the second guide holes of the third guide grooves of the second segmented iron core, the third guide holes of the third guide grooves of the third segmented iron core, the first guide holes of the second guide grooves of the fourth segmented iron core, the second guide holes of the second guide grooves of the fifth segmented iron core, the third guide holes of the second guide grooves of the sixth segmented iron core, the first guide holes of the first guide grooves of the seventh segmented iron core, the second guide holes of the first guide grooves of the eighth segmented iron core, and the third guide holes of the first guide grooves of the ninth segmented iron core.

12. The rotor of the motor according to claim 3, wherein, The inner angle (A) between the guide holes is the angle obtained by dividing the tilt angle (TA) by the number (TN - 1) which is the number of the nth segmented iron core minus 1.

13. The rotor of the motor according to claim 3, wherein, The first guide groove and the third guide groove are symmetrically formed with respect to the center line passing through the center of the second guide groove in the radial direction.

14. The rotor of the motor according to claim 3, wherein, In each permanent magnet of the first segmented iron core to the nth segmented iron core, with the horizontal line passing through the axial center of the first segmented iron core to the nth segmented iron core as a reference, the permanent magnets of the segmented iron cores far from the horizontal line are arranged at intervals in the same circumferential direction to form a preset tilt angle.

15. The rotor of the motor according to claim 2, wherein, The rotor iron core further includes balance grooves formed between the first group and the second group.

16. The rotor of the motor according to claim 15, wherein, The balance grooves are configured to form right angles with the second guide grooves of the first group and the second guide grooves of the second group respectively.

17. The rotor of the motor according to claim 2, wherein, The center of the second guide groove is arranged on the center line of the magnetic pole on the radially outer side; The center of the first guide groove is arranged at a position separated by a preset angle in one direction in the circumferential direction with respect to the center line of the magnetic pole on the radially outer side; The center of the second guide groove is arranged at a position separated by a preset angle in the other direction in the circumferential direction with respect to the center line of the magnetic pole on the radially outer side.

18. The rotor of the motor according to any one of claims 1 to 17, wherein, The permanent magnet includes a first magnet or a pair of second magnets; The first magnet is arranged along the circumferential direction of the rotor iron core; A pair of the second magnets are arranged to be separated from each other along the circumferential direction of the rotor iron core, and a pair of the second magnets form a preset inner angle.

19. The rotor of the motor according to claim 18, wherein, The permanent magnet includes the first magnet and a pair of the second magnets, and the first magnet is disposed between the pair of the second magnets in the circumferential direction.

20. A method for manufacturing a rotor of a motor, wherein, The rotor includes: a rotating shaft; a rotor core including a first segmented core to an nth segmented core, each of the first segmented core to the nth segmented core including a plurality of stacked magnetic steel sheets, and each of the first segmented core to the nth segmented core being axially coupled to the rotating shaft; and permanent magnets, with the permanent magnets being coupled to each of the first segmented core to the nth segmented core to form a plurality of magnetic poles; The method for manufacturing the rotor includes: a step of stamping a plurality of the magnetic steel sheets such that each of the plurality of magnetic steel sheets includes a rotating shaft hole for coupling the rotating shaft, a permanent magnet coupling portion (165) for coupling the permanent magnet, and a guiding groove for inserting a guiding pin to guide the permanent magnets provided in each of the first segmented core to the nth segmented core to form a preset inclination angle, and the guiding groove is disposed inside the plurality of magnetic poles in the radial direction, the guiding groove including a first guiding groove, a second guiding groove, and a third guiding groove spaced apart in the circumferential direction, and the first guiding groove, the second guiding groove, and the third guiding groove are respectively disposed at positions forming a preset angle with respect to the center of the magnetic pole on the radially outer side; a step of stacking a plurality of the magnetic steel sheets to form each of the first segmented core to the nth segmented core; a step of coupling the permanent magnets to the first segmented core to the nth segmented core respectively; a step of axially coupling the guiding groove of the first segmented core to the guiding groove of the nth segmented core to the guiding pin such that the permanent magnets provided in each of the first segmented core to the nth segmented core can rotate a preset angle in one direction or the other direction in the circumferential direction to form the inclination angle; and a step of coupling the rotating shaft to the rotating shaft holes of the first segmented core to the nth segmented core.

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