Motor for vehicle

Abstract

The present disclosure is applicable to the field of motor technology, and relates to, for example, a motor for a vehicle. A motor for a vehicle according to one aspect disclosed herein comprises: a shaft; a rotor coupled to the shaft; and a stator positioned on an outer circumferential portion of the rotor. The stator comprises: a yoke forming a cylindrical outer circumferential surface; a plurality of first teeth in interlocking engagement in the inner circumferential direction of the yoke and protruding in the inner circumferential direction of the yoke; and a plurality of second teeth integrally formed with the yoke and protruding in the inner circumferential direction of the yoke.

Description

vehicle motors

[0001] The present disclosure is applicable to the field of motor technology, and relates to, for example, a motor for a vehicle.

[0002] Typically, a separate power-assisted steering system is used to supplement the stability of a vehicle's steering. Previously, hydraulic devices were used as such auxiliary steering devices, but recently, electric power steering systems (EPS; Electric Power Steering systems) have been used, boasting minimal power loss and superior accuracy.

[0003] This type of electric power steering (EPS) ensures turning stability and provides rapid restoring force by driving a motor in the electronic control unit according to driving conditions detected by the magnetic flux sensor, torque angle sensor, and torque sensor, thereby enabling the driver to drive safely.

[0004] These EPS systems allow the driver to steer with less force by having the motor assist the torque that the driver applies to the steering wheel.

[0005] The main parts of a motor used in this way may include a stator and a rotor. A shaft is connected to the rotor. Here, wire (coil) is wound around the stator, and magnets are connected to the rotor, so that the rotor rotates through electromagnetic interaction.

[0006] These stators can be composed of a stator core and a coil (wire). The stator core can be divided into an integral core formed entirely of one piece and a segmented core formed by joining together segmented parts. Both the integral core and the segmented core have in common a cylindrical yoke and teeth protruding inward from the yoke, around which wire is wound.

[0007] An integral core is formed by integrally forming a yoke portion and teeth joined to the yoke portion. On the other hand, a split core is formed by joining the yoke portion and teeth in a split state.

[0008] Here, the integral core has limitations in winding the wire because the nozzle must be inserted between each tooth when winding the wire. In other words, the space between the teeth may not be utilized efficiently.

[0009] Meanwhile, split cores can be assembled unevenly due to tolerances during assembly of the split yokes and teeth. Split cores can wind a greater amount of wire than integral cores, but due to assembly tolerances, they are disadvantageous in cogging torque and may be disadvantageous in noise, vibration, and harshness (NVH) issues.

[0010] Therefore, a solution to these problems is required.

[0011] The technical problem to be solved by the present disclosure is to provide a stator core capable of winding a large amount of wire while being advantageous in cogging torque, and a motor including the same.

[0012] In addition, the present disclosure seeks to provide a stator core capable of winding a large amount of wire while having excellent characteristics with respect to noise, vibration, and noise, and a motor including the same.

[0013] In addition, the present disclosure seeks to provide a stator core having the advantages of an integral stator core and a split stator core, and a motor including the same.

[0014] According to one aspect of the present disclosure, a vehicle motor may include a shaft; a rotor coupled to the shaft; and a stator positioned on an outer periphery of the rotor, wherein the stator includes a yoke forming a cylindrical outer periphery surface; a plurality of first teeth that are concave-convexly coupled to an inner periphery of the yoke and protrude in the inner periphery of the yoke; and a plurality of second teeth that are formed integrally with the yoke and protrude in the inner periphery of the yoke.

[0015] According to another aspect of the present disclosure, a motor for a vehicle may include: a shaft; a rotor coupled to the shaft; and a stator positioned on an outer periphery of the rotor, wherein the stator may include: a yoke forming a cylindrical outer periphery; a first coupling portion provided at a first position in the inner periphery of the yoke; a first tooth connected to the yoke by a second coupling portion coupled to the first coupling portion and protruding in the inner periphery of the yoke; and a second tooth connected integrally with the yoke at a second position spaced a first distance apart in the circumferential direction of the yoke from the first position and protruding in the inner periphery of the yoke.

[0016] First, according to one embodiment of the present disclosure, the first teeth connected to the stator core by the connecting portion can substantially form an integral structure with the stator core, thereby significantly reducing the assembly tolerance that occurs in the case of a split core. Accordingly, it is possible to secure a stable assembly dimensional tolerance after the stator core is assembled.

[0017] Therefore, according to the embodiment of the present disclosure, a large amount of wire can be wound on the stator core at the level of a split core, and a uniform position between teeth can be secured.

[0018] Accordingly, it is advantageous in cogging torque and can be advantageous in so-called NVH (Noise, Vibration and Harshness) problems such as noise, vibration, and noise.

[0019] Additionally, the stator core according to the embodiment of the present disclosure can have the advantages of both an integral stator core and a split stator core.

[0020] Furthermore, according to another embodiment of the present invention, there are additional technical effects not mentioned herein. Those skilled in the art will understand the full scope of the specification and drawings.

[0021] FIG. 1 is a circumferential cross-sectional view showing an assembled state of a stator core according to one embodiment of the present disclosure.

[0022] Fig. 2 is a cross-sectional view schematically showing an assembled state of a stator core according to one embodiment of the present disclosure.

[0023] Figure 3 is an enlarged view of the main part of Figure 2.

[0024] FIG. 4 and FIG. 5 are cross-sectional views showing an assembled state of a stator core according to one embodiment of the present disclosure.

[0025] FIG. 6 is a cross-sectional view showing a motor including a stator core according to one embodiment of the present disclosure.

[0026] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components will be assigned the same reference numbers, and redundant descriptions thereof will be omitted. The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably solely for the convenience of writing the specification, and do not in themselves have distinct meanings or roles.

[0027] Additionally, when describing the embodiments disclosed in this specification, detailed descriptions of related known technologies will be omitted if it is determined that such detailed descriptions may obscure the gist of the embodiments disclosed in this specification. Furthermore, it should be noted that the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and should not be construed as limiting the technical concepts disclosed in this specification.

[0028] Furthermore, although each drawing is described for convenience of explanation, it is also within the scope of the present disclosure that a person skilled in the art may implement another embodiment by combining at least two or more drawings.

[0029] Additionally, when an element such as a layer, region or substrate is referred to as existing "on" another element, it will be understood that this may be directly on the other element, or that there may be intermediate elements in between.

[0030]

[0031] Fig. 1 is a circumferential cross-sectional view showing an assembled state of a stator core according to one embodiment of the present disclosure. Fig. 2 is a cross-sectional view schematically showing an assembled state of a stator core according to one embodiment of the present disclosure. Fig. 3 is an enlarged view of a major portion of Fig. 2.

[0032] Hereinafter, a stator core according to one embodiment of the present disclosure will be described with reference to FIGS. 1 to 3.

[0033] Referring to FIG. 1, a stator core (100) according to one embodiment of the present disclosure may include a yoke (110) forming a cylindrical outer circumferential surface (111), and teeth (130, 140) connected to the yoke (110) and protruding in the direction of the inner circumference (112) of the yoke (110).

[0034] At this time, the teeth (130, 140) may include a first tooth (130) that is assembled and connected to the yoke (110) and a second tooth (140) that is integrally connected to the yoke (110).

[0035] The first tooth (130) and the second tooth (140) can be positioned at a certain distance (first distance; A) in the circumferential direction of the yoke (110).

[0036] Here, a plurality of first teeth (130) assembled and connected to the yoke (110) may be provided. These plurality of first teeth (130) may be positioned spaced apart from each other in the circumferential direction at regular intervals. The interval between these neighboring first teeth (130) may correspond to a distance twice the first distance (A).

[0037] Likewise, a plurality of second teeth (140) integrally connected to the yoke (110) may be provided. These plurality of second teeth (140) may be positioned circumferentially spaced apart at regular intervals. The interval between these neighboring second teeth (140) may correspond to a distance twice the first distance (A).

[0038] Referring to FIG. 1, a first tooth (130) may be positioned between two adjacent second teeth (140). For example, the first tooth (130) may be positioned at the center of two adjacent second teeth (140).

[0039] Similarly, a second tooth (140) may be positioned between two adjacent first teeth (130). For example, the second tooth (140) may be positioned at the center of two adjacent first teeth (130).

[0040] The first tooth (130) can be connected to the yoke (110) by the connection of the first connecting portion (120) provided on the yoke (110) and the second connecting portion (150) provided on the first tooth (130).

[0041] In this way, the teeth (130, 140) protruding in the inner circumference (112) of the yoke (110) may include a first tooth (130) connected to the yoke (110) by a second coupling portion (150) coupled to the first coupling portion (120), and a second tooth (140) integrally connected to the yoke (110) at a second position spaced a first distance apart in the circumferential direction of the yoke (110) from a first position where the first coupling portion (120) is located.

[0042] For example, the first tooth (130) can be connected to the yoke (110) by winding a wire (210; see FIG. 5). This will be described later with reference to the drawings.

[0043] The first tooth (130) may be provided with a first pole shoe (131) in the opposite direction of the yoke (110), and the second tooth (140) may be provided with a second pole shoe (151) in the opposite direction of the yoke (110).

[0044] The stator core (100) can be configured by overlapping and fixing multiple thin steel plates. Wires are wound around a plurality of teeth, including the first tooth (130) and the second tooth (140), and these plurality of teeth (130, 140) can serve as a path for the magnetic lines of force of the magnetic field generated by the rotation of the rotor (400; see FIG. 6).

[0045] The stator core (100) may have a structure in which a plurality of teeth (130, 140), for example, 12 teeth, are sequentially positioned in a ring shape. In this case, when a 3-phase drive method is applied, the 12 teeth (130, 140) may be sequentially positioned for each of the U, V, and W phases.

[0046] As an exemplary embodiment, referring to FIG. 3, the first coupling portion (120) may include a groove (121) provided in the inner circumference (112) of the yoke (110). In addition, the first coupling portion (120) may further include a step (122) connected from the groove (121) toward the inner circumference (112) of the yoke (110) and having a narrower width than the groove (121).

[0047] As an exemplary embodiment, referring to FIG. 3, the second coupling portion (150) may include a coupling protrusion (151) coupled to the first coupling portion (120). For example, the second coupling portion (150) and the first coupling portion (120) may be mechanically connected by a concave-convex coupling. In addition, the second coupling portion (150) may further include a coupling portion (152) positioned between the coupling protrusion (151) and the first tooth (130) and having a narrower width than the coupling protrusion (151).

[0048] By this exemplary configuration of the first coupling portion (120) and the second coupling portion (150), the coupling protrusion (151) of the second coupling portion (150) can be coupled to the groove (121) of the first coupling portion (120).

[0049] Meanwhile, the connecting portion (152) of the second connecting portion (150) may be positioned on the step (122) of the first connecting portion (120). By combining the connecting portion (152) and the step (122), the connecting projection (151) combined with the groove (121) can be prevented from being separated in the direction of the inner circumference (112) of the yoke (110).

[0050] In this way, the shape of the first connecting portion (120) can roughly form a concave portion, and the shape of the second connecting portion (150) connected to the first connecting portion (120) can roughly form a convex portion, so that the first connecting portion (120) and the second connecting portion (150) can be connected by a convex-concave connection.

[0051] Referring to Fig. 3, the groove (121) may have a first width (Y1). The engaging protrusion (151) coupled to the groove (121) may have a second width (Y2). The first width (Y1) and the second width (Y2) may be substantially the same, but may have a tolerance that allows the groove (121) and the engaging protrusion (151) to fit together.

[0052] For example, the step (122) may have a third width (C1). The connecting portion (152) coupled to the step (122) may have a fourth width (C2). Similarly, the third width (C1) and the fourth width (C2) may be substantially the same, but may have a tolerance that allows the step (122) and the connecting portion (152) to fit together.

[0053] As such, as an exemplary embodiment, the first coupling portion (120) and the second coupling portion (150) may be secured in a fitting manner. However, the present disclosure is not limited thereto. For example, the first coupling portion (120) and the second coupling portion (150) may be joined with a certain amount of slack, and the joined state may be strengthened by welding.

[0054] Referring to FIGS. 1 to 3, for example, the shapes of the engaging protrusion (151) and the connecting portion (152) may form a hammer shape. That is, the engaging protrusion (151) may form a rectangular shape. However, this is merely exemplary, and the engaging protrusion (151) may have various shapes that can be combined with the groove (121). Accordingly, it goes without saying that the groove (121) may have various shapes corresponding to the engaging protrusion (151).

[0055] In this exemplary embodiment where the first coupling portion (120) and the second coupling portion (150) form a hammer shape, the groove (121) may have a first height (H1), and the coupling protrusion (151) coupled to the groove (121) may have a second height (H1). In addition, the step (122) may have a third height (D1), and the connecting portion (152) coupled to the step (122) may have a fourth height (D2).

[0056] The first height (H1), the second height (H2), the third height (D1) and the fourth height (D2) may be substantially the same, but may have a tolerance that allows the groove (121) and the engaging projection (151) and the step (122) and the connecting portion (152) to fit together.

[0057] Meanwhile, as an exemplary embodiment, the outer side of the connecting portion (152) at the upper end of the first tooth (130), i.e., the portion where the second connecting portion (150) is connected, may have a certain curvature (R). For example, this curvature (R) may be the same as the curvature of the inner circumference (112) surface of the yoke (110). In this way, by having the same curvature at the portions where they are assembled and come into contact with each other, the tolerance due to the connection of a plurality of first teeth (130) can be reduced.

[0058] As another example, the outer side of the connecting portion (152) at the upper end of the first tooth (130), i.e., the portion where the second connecting portion (150) is connected, may have a flat shape. That is, the curvature of the upper end of the first tooth (130) where the second connecting portion (150) is located may be smaller than the curvature of the inner circumference (112) surface of the yoke (110). In this case, the strength of the connection by the fit between the first connecting portion (120) and the second connecting portion (150) can be improved.

[0059] In this way, the curvature of the upper end of the first tooth (130) where the second connecting portion (150) is located may be equal to or smaller than the curvature of the inner circumference (112) surface of the yoke (110).

[0060]

[0061] FIG. 4 and FIG. 5 are cross-sectional views showing an assembled state of a stator core according to one embodiment of the present disclosure.

[0062] Referring to FIGS. 4 and 5, as mentioned above, after the wires (210, 220) are wound around the first tooth (130) and the second tooth (140), respectively, the first tooth (130) can be connected by being joined to the yoke (110).

[0063] The wires (210, 220) may be wound sequentially on the teeth (130, 140) of the stator core (100) as coils through which current flows. The wires (210, 220) may be wound along the outer surfaces of the first tooth (130) and the second tooth (140), respectively. At this time, insulators (132, 142) may be coupled to the outer surfaces of the first tooth (130) and the second tooth (140) to insulate the wires (210, 220) from the corresponding first tooth (130) and second tooth (140), respectively.

[0064] Referring to FIG. 4, a wire (220) can be wound around the second tooth (140). At this time, the first tooth (130) may not be connected to the first connecting portion (120).

[0065] Integral cores have limitations in their wire winding capabilities, as the nozzle must be inserted between each tooth when winding the wire. Furthermore, there may be limitations on the size of the slots, which are the distance between the pole shoes of adjacent teeth.

[0066] However, according to the embodiment of the present disclosure, since the limitation on winding the wire (220) around the second tooth (140) is reduced, a larger amount (length) of wire (220) can be wound compared to the integral core. In fact, the wire (220) can be wound around the second tooth (140) at a level corresponding to that of the split core.

[0067] Referring to FIG. 5, the first tooth (130) is not connected to the yoke (110), and the wire (210) can be wound around the first tooth (130). Since the first tooth (130) is not constrained, a larger amount (length) of wire (210) can be wound around the first tooth (130) compared to an integral core. In practice, the wire (210) can be wound around the first tooth (130) at a level corresponding to that of a split core.

[0068] In this way, after the wires (210, 220) are wound around the first tooth (130) and the second tooth (140), the first tooth (130) can be stably connected to the yoke (110) by the connection of the first coupling portion (120) and the second coupling portion (150).

[0069] At this time, the first tooth (130) can substantially form an integral structure in the stator core (100), so that the assembly tolerance that occurs in the case of a split core can be significantly reduced. Accordingly, it is possible to secure a stable assembly dimensional tolerance after the stator core (100) is assembled.

[0070] Therefore, according to the embodiment of the present disclosure, a large amount of wire can be wound around the stator core (100) at the level of a split core, and uniform positions between teeth can be secured. Accordingly, it is advantageous in terms of cogging torque and can be advantageous in so-called NVH (Noise, Vibration, and Harshness) problems such as noise, vibration, and noise. In other words, the advantages of both an integral core and a split core can be secured.

[0071]

[0072] FIG. 6 is a cross-sectional view showing a motor including a stator core according to one embodiment of the present disclosure.

[0073] Through the process described above, a stator core (100) equipped with wires (210, 220) can be manufactured. Using this stator core (100), a motor (10) as illustrated in FIG. 6 can be configured. This motor (10) can include a shaft (rotating shaft; 400) and a rotor (300) coupled to the shaft (400). The shaft (400) and the rotor (300) can be coupled in the inner circumferential direction of the stator core (100) described above.

[0074] The rotor (300) may include a rotor core (310) and a magnet (320) installed on the outer surface of the rotor core (310). Here, the rotor core (310) and the magnet (320) are briefly expressed.

[0075] Here, the stator core (100) has the same configuration as that described above with reference to FIGS. 1 to 5. Therefore, a redundant description thereof is omitted.

[0076] Meanwhile, the distance (W1) between neighboring pole shoes (131, 141) of the stator core (100) can be freely set.

[0077] For example, the distance between the first pole shoe (131) and the second pole shoe (141), the so-called slot size (W1), can be set smaller than the diameter of the nozzle for winding the wire (210, 220).

[0078] For example, the slot size (W1) may be less than five times the diameter of the wire (210, 220). This slot size (W1) may be less than the diameter of the wire (210, 220).

[0079]

[0080] The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present disclosure, and are not necessarily limited to just one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by those skilled in the art to which the embodiments pertain. Therefore, the contents related to such combinations and modifications should be construed as being included within the scope of the present disclosure.

[0081] In addition, although the above description focuses on examples, these are merely examples and do not limit the present disclosure. Those skilled in the art to which the present disclosure pertains will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present embodiments. For example, each component specifically shown in the examples can be modified and implemented. In addition, differences related to such modifications and applications should be interpreted as being included within the scope of the present disclosure as defined in the appended claims.

[0082] According to the present disclosure, a motor for a vehicle can be provided.

Claims

1. Shaft; a rotor coupled to the shaft; and including a stator located on the outer periphery of the rotor, The above stator, A yoke forming a cylindrical outer surface; A plurality of first teeth that are recessed and protrude in the inner circumference of the yoke; and A vehicle motor including a plurality of second teeth formed integrally with the yoke and protruding in the inner circumferential direction of the yoke.

2. A vehicle motor in the first paragraph, wherein the first teeth and the second teeth are provided in multiple numbers at regular intervals along the outer circumferential surface of the yoke.

3. A vehicle motor in the second paragraph, wherein the second tooth is provided at a position spaced a first distance apart from the first tooth in the circumferential direction of the yoke.

4. A vehicle motor in the third paragraph, wherein the predetermined interval is twice the first distance.

5. In the first paragraph, the uneven bonding is A groove provided in the inner direction on the above yoke; and A vehicle motor comprising a coupling projection connected to the first tooth and coupled to the groove.

6. A vehicle motor in accordance with claim 5, further comprising a step connected in the inner circumferential direction of the yoke in the groove and having a narrower width than the groove.

7. A motor for a vehicle, in accordance with claim 5, further comprising a connecting portion positioned between the connecting projection and the first tooth and having a narrower width than the connecting projection.

8. In the fifth paragraph, a vehicle motor having a curvature of the upper end of the first tooth where the coupling protrusion is located that is equal to or smaller than the curvature of the inner circumferential surface of the yoke.

9. A vehicle motor in accordance with claim 1, wherein the first tooth has a first pole shoe provided in an opposite direction of the yoke, the second tooth has a second pole shoe provided in an opposite direction of the yoke, and further includes a wire wound around the first tooth and the second tooth.

10. A vehicle motor in accordance with claim 9, wherein the distance between the first pole shoe and the second pole shoe is smaller than the diameter of the nozzle for winding the wire.

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