Stator and electric motor

Abstract

To provide a stator capable of reducing torque ripple while maintaining average torque, and an electric motor.SOLUTION: A stator 2 includes a stator core 4 and a coil 6. The stator core 4 has a coreback 7 and multiple teeth 8. The coreback 7 has a ring shape. The teeth 8 protrude from the inner peripheral edge of the core back 7 toward the axis X1 of the rotating shaft 13 of the rotor 3. The coil 6 is a conductive wire wounded on the multiple teeth 8. Each of the multiple teeth 8 has a tooth body 9 and a flange 10 extending to the circumferential direction from the tip of the tooth body 9. The flange 10 has a base part 101 and a wide portion 102 located closer to the tip side in the circumferential direction than the base part 101. Viewed from the axial direction, which is the direction in which the axis X1 extends, the width of the wide portion 102 in the direction intersecting the circumferential direction Y1 is longer than the width of the base part 101 in a direction intersecting with the circumferential direction Y1.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a stator and an electric motor, and more particularly to a stator having a stator core and a coil, and an electric motor including the stator. [Background technology]

[0002] A stator used in an electric motor includes a stator core and a coil. The stator core includes a cylindrical core back and a plurality of teeth arranged side by side on its inner circumferential surface. The coil is made of a conductive wire wound around the plurality of teeth. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-163409 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the electric motor described in Patent Document 1, the teeth have a teeth body extending radially and a teeth expansion portion including a pair of flanges extending circumferentially from the radially inner end of the teeth body portion, which allows the teeth to pick up a large amount of magnetic flux from the rotor, thereby preventing a reduction in output.

[0005] However, Patent Document 1 does not pay attention to or propose any solution to torque ripple that causes vibration and noise.

[0006] The present disclosure has been made in consideration of the above-mentioned points, and has an object to provide a stator and an electric motor that can reduce torque ripple while maintaining average torque. [Means for solving the problem]

[0007] A stator according to one aspect of the present disclosure includes a stator core and a coil. The stator core includes a core back and a plurality of teeth. The core back is annular. The plurality of teeth protrude from an inner peripheral edge of the core back toward an axis of a rotating shaft of a rotor. The coil is formed by winding a conductive wire around the plurality of teeth. Each of the plurality of teeth includes a tooth body and a flange portion extending circumferentially from a tip of the tooth body. The flange portion includes a root portion and a wide portion located circumferentially toward the tip side of the root portion. When viewed from the axial direction, which is the direction in which the axis extends, the width of the wide portion in a direction intersecting the circumferential direction is longer than the width of the root portion in a direction intersecting the circumferential direction.

[0008] An electric motor according to one aspect of the present disclosure includes the stator and a rotor. Effect of the Invention

[0009] According to the stator and electric motor according to one aspect of the present disclosure, it is possible to increase the average torque while suppressing the torque ripple. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a partial cross-sectional view of an electric motor according to a first embodiment. [Diagram 2] FIG. 2 is a partial plan view of the stator of the electric motor. [Diagram 3] FIG. 3 is a partially enlarged plan view of the stator of the above embodiment. [Figure 4] FIG. 4 is an enlarged plan view of the flange of the stator of the above embodiment. [Diagram 5] FIG. 5 is a graph showing the change in average torque and torque ripple versus protrusion angle. [Figure 6] FIG. 6 is an enlarged plan view of the flange portion of the same. [Figure 7] FIG. 7 is a graph showing the change in average torque and torque ripple with respect to the slot opening. [Figure 8]FIG. 8 is a partial enlarged view of a flange portion of a stator of an electric motor according to a second embodiment. [Figure 9] FIG. 9 is a partial enlarged view of a flange portion of a stator of an electric motor according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (Embodiment) Hereinafter, a stator and an electric motor according to an embodiment of the present disclosure will be described in detail with reference to the drawings. However, each figure described in the following embodiment is a schematic diagram, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. Note that the configuration described in the following embodiment is merely one example of the present disclosure. The present disclosure is not limited to the following embodiment, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0012] (First embodiment) (1) Overview of the motor An electric motor 1 according to an embodiment of the present disclosure will be described with reference to Fig. 1. The electric motor 1 is an inner rotor type motor.

[0013] As shown in Fig. 1, electric motor 1 has a stator 2 and a rotor 3. In the following description, the direction in which axis X1 of rotating shaft 13 (described later) extends (the direction perpendicular to the paper surface of Fig. 1) is referred to as the axial direction, and the circumferential direction of rotor 3 is referred to as the circumferential direction Y1. Also, the case viewed from the axial direction is referred to as "in a plan view."

[0014] The stator 2 is a stator having a stator core 4 and a plurality of coils 6 (12 in total). The stator core 4 is a laminated core in which a plurality of electromagnetic steel sheets are laminated in the thickness direction. The stator core 4 has an annular core back 7 and a plurality of teeth 8 (12 in total), and is formed in a generally cylindrical column shape as a whole. The teeth 8 are arranged at regular intervals along the circumferential direction C1 on the inner peripheral surface of the core back 7, and extend radially inward. The coils 6 correspond to the teeth 8, and each coil 6 is formed by winding a conductive wire 34 around the corresponding tooth 8.

[0015] The rotor 3 is an IPM (Interior Permanent Magnet) type rotor in which a permanent magnet is embedded inside the rotor core. More specifically, the rotor 3 has a so-called spoke-type rotor structure in which a pair of magnetic pole faces of the magnets are arranged so as to face the circumferential direction. Specifically, the rotor 3 is arranged radially inside the stator 2, and includes a rotor core 11, a rotating shaft 13, and a plurality of (10 in total) permanent magnets 12. The permanent magnets 12 are members that generate magnetic flux that serves as the driving force for the rotor 3, and are magnetized so that the direction of the magnetic poles is along the circumferential direction Y1 of the rotor core 11.

[0016] The electric motor 1 operates as follows: Three-phase currents having a phase difference of 120° electrical angle from each other are supplied to the coils 6 through a power supply connection unit (not shown), exciting the stator 2 and generating a rotating magnetic field. This rotating magnetic field interacts with a magnetic field generated by a permanent magnet 12 provided in the rotor 3, generating a rotational torque in the rotor 3, causing the rotor 3 to rotate around the axis X1.

[0017] (2)Stator (2-1) Coreback The core back 7 is cylindrical (annular in plan view) and has a central axis X11 that coincides with the axis X1 of the rotating shaft 13 of the electric motor 1.

[0018] (2-2) Teeth The teeth 8 protrude from the inner peripheral edge of the core back 7 toward the central axis X11. A slot 31 is provided between adjacent teeth 8 in the circumferential direction Y1. The slot 31 is a space that penetrates in the direction in which the central axis X11 extends (hereinafter referred to as the "axial direction").

[0019] 1 to 3, each tooth 8 has a tooth body 9 and a pair of flange portions 10. The pair of flange portions 10 protrude from radially inner tips of the tooth body 9 along the circumferential direction Y1.

[0020] (2-2-1) Teeth body The tooth body 9 extends in the radial direction and has, for example, a rectangular parallelepiped shape. The coils 6 arranged in the slots 31 are wound around the tooth body 9. As shown in Fig. 3, the tooth body 9 has a pair of side edges 91 and an inner circumferential surface edge 92. The pair of side edges 91 extend generally in the radial direction. The inner circumferential surface edge 92 extends along the circumferential direction Y1.

[0021] (2-2-2) Flange The edge of the circumferential tip of the flange portion 10 is made up of only curves in a plan view, specifically a circular arc B1 (described later).

[0022] 4, each flange portion 10 has a root portion 101 and a wide portion 102 in a plan view. The root portion 101 is in contact with the tooth main body 9. The wide portion 102 is located on the circumferential tip side of the root portion 101. The width of the wide portion 102 in a direction intersecting the circumferential direction Y1 (e.g., radial direction) is greater than the width of the root portion 101 in a direction intersecting the circumferential direction Y1 (e.g., radial direction).

[0023] In this embodiment, the outer peripheral edge of the flange portion 10 has a first outer peripheral edge 93 that is connected to the side edge 91 and is smoothly recessed radially inward in a plan view, and a second outer peripheral edge 94 that extends circumferentially and radially outward from the first outer peripheral edge 93. Therefore, the width of the flange portion 10 at the circumferential outer position of the second outer peripheral edge 94 (corresponding to a part of the wide portion 102) is longer than the width of the flange portion 10 at the circumferential outer position of the second outer peripheral edge 94 (corresponding to a part of the root portion 101).

[0024] As described above, since the width of the wide portion 102 is greater than the width of the base portion 101, the torque ripple can be reduced while maintaining the average torque.

[0025] (2-3) Detailed explanation of the flange (2-3-1) Plan view shape of flange Next, the shape of the flange portion 10 in plan view will be described in further detail with reference to the lines and points drawn in Figs.

[0026] 3 shows the core center line Z1. The core center line Z1 is a straight line connecting the central axis X11 and the circumferential center of the tooth 8.

[0027] FIG. 4 shows a reference line A1, a circular arc B1, a straight line C1, a circular arc D1, a line segment E1, a straight line F1, an intersection point G1, and a line segment H1.

[0028] The reference line A1 is a straight line extending from the central axis X11. The reference line A1 is offset from the core center line Z1 by an angle of (360 degrees / number of slots (12 in this embodiment) / 2). In other words, the reference line A1 is a straight line connecting the circumferential center of the slot 31 and the central axis X11, and is the same distance in the circumferential direction Y1 from the teeth 8 on both circumferential sides.

[0029] The arc B1 is an arc-shaped edge of the tip portion located further toward the tip side from the wide portion 102.

[0030] The straight line C1 is a straight line that partially coincides with the second outer circumferential edge 94 of the flange portion 10.

[0031] The arc D1 is a circular arc that partially coincides with the inner peripheral edge 92 of the tooth 8.

[0032] The line segment E1 is parallel to the reference line A1 in a plan view, is tangent to the arc B1, and extends between the straight line C1 and the arc D1.

[0033] The straight line F1 is a straight line partially coinciding with the side edge 91 of the tooth main body 9.

[0034] Intersection point G1 is the intersection point of lines C1 and F1.

[0035] The line segment H1 is a straight line that extends from the intersection point G1 toward a point on the circular arc D1 and is parallel to the line segment F1. The line segment H1 is shorter than the line segment E1.

[0036] (2-3-2) Protrusion angle The protrusion angle θ1 will be described with reference to Figures 4 and 5. The protrusion angle θ1 is the inclination angle of the flange portion 10 with respect to the tooth main body 9. Specifically, the protrusion angle θ1 is the angle between the side edge 91 (straight line F1) of the tooth main body 9 and the second outer periphery edge 94 (straight line C1) of the flange portion 10. In this embodiment, the protrusion angle θ1 is equal to or greater than 60 degrees and less than 105 degrees. In particular, the angle at which the width of the base portion 101 is narrower than the width of the wide portion 102 is when the protrusion angle θ1 is less than 105 degrees.

[0037] If the projection angle θ1 is within the above range, as shown in FIG. 5, the decrease rate of the average torque is less than 5%, and the torque ripple is 1% or less.

[0038] (2-3-3) Slot Open The slot open will be described with reference to Figures 6 and 7. The slot open is the ratio of the distance (circumferential distance) between the tips of a pair of flange portions 10 to the width (circumferential distance) of the slot 31.

[0039] 6, the distance J1 is half the circumferential distance between the root portions 101 of a pair of adjacent crocodile portions 10 that are spaced apart in the circumferential direction Y1 among the flange portions 10. Specifically, the distance J1 is the distance of the shortest straight line connecting the reference line A1 and the line segment H1.

[0040] 6, the distance K1 has a length that is half the circumferential distance between the circumferential tips 103 of a pair of adjacent crocodile portions 10. Specifically, the distance K1 is the distance of the shortest straight line connecting the reference line A1 and the line segment E1.

[0041] If (distance K1 / distance J1)×100=ratio [%], the ratio is in the range of 10% to 85%. If it is in the above range, the decrease rate of the average torque is less than 5% and the torque ripple is 1% or less, as shown in FIG. 7.

[0042] (3) Rotor (3-1) Rotor core The rotor core 11 is a laminated core in which a plurality of electromagnetic steel sheets are laminated along the axial direction.

[0043] 1, a shaft hole is formed in the center of rotor core 11, passing through rotor core 11 along the axial direction and opening at both end faces.

[0044] As shown in Fig. 1, the rotor core 11 is provided with a plurality of magnet arrangement holes 16 (10 in total). The magnet arrangement holes 16 are provided radially, specifically at 10 locations equally spaced apart in the circumferential direction Y1. Each magnet arrangement hole 16 extends along the axial direction and penetrates the plurality of electromagnetic steel sheets in the axial direction. Each magnet arrangement hole 16 has a rectangular opening shape in a plan view, specifically with its longitudinal direction aligned with the radial direction. Each magnet arrangement hole 16 is formed so as to open toward the axial center X1 side along the inner circumferential edge of the rotor core 11.

[0045] As shown in FIG. 1, the rotor core 11 is provided with a plurality of recesses 17 (10 in total). The recesses 17 are provided radially, specifically at 10 locations at equal intervals in the circumferential direction Y1. Each recess 17 extends along the axial direction and penetrates the plurality of electromagnetic steel sheets in the axial direction. Each recess 17 has a rectangular opening shape in a plan view, specifically with its longitudinal direction aligned along the radial direction. Each recess 17 is provided between two adjacent magnet arrangement holes 16 in the circumferential direction Y1. As a result, the rotor core 11 is a cylindrical member in which the magnet arrangement holes 16 and the recesses 17 are alternately arranged in the circumferential direction Y1, as shown in FIG. 2.

[0046] Each recess 17 is a portion recessed radially outward from the innermost circumferential edge 18 of rotor core 11 in plan view, in other words, a portion that opens toward axis X1.

[0047] The recess 17 is filled with a filling portion 21 of the resin member 14, which will be described later.

[0048] The recesses 17 have the function of restricting the flow of magnetic flux from the permanent magnets 12. Since the recesses 17 are provided so as to extend from the inner surface of the rotor core 11, the magnetic fluxes of the permanent magnets 12 adjacent in the circumferential direction Y1 are prevented from colliding with each other in the portion where the recesses 17 are provided, i.e., the portion closer to the radial inside of the rotor core 11. In other words, the generation of a magnetic path passing through the radial inside of the permanent magnets 12 adjacent in the circumferential direction is prevented, and as a result, leakage magnetic flux is reduced.

[0049] (3-2) Rotation axis The rotating shaft 13 is a cylindrical member having an axis X1 which is the center of rotation. The rotating shaft 13 is inserted into an axial hole of the rotor core 11 and fixed via a resin member 14 which will be described later.

[0050] (3-3) Plastic materials The resin member 14 is disposed between the rotor core 11 and the rotating shaft 13 to fix the rotor core 11 and the rotating shaft 13. Specifically, the resin member 14 has an annular portion 20 disposed between the rotor core 11 and the rotating shaft 13, and a plurality of filling portions 21 provided on the outer periphery of the annular portion 20.

[0051] (3-4) Permanent magnets The multiple permanent magnets 12 are each inserted into and fixed in a corresponding one of the multiple magnet arrangement holes 16 in the rotor core 11. A sintered ferrite magnet is used as the permanent magnet 12. The permanent magnet 12 may also be a samarium-cobalt based permanent magnet, a neodymium magnet, or the like.

[0052] The permanent magnet 12 has approximately the same shape and dimensions as the magnet arrangement hole 16. The permanent magnet 12 has a roughly rectangular parallelepiped shape, and has a spoke shape that is long in the radial direction when viewed from above.

[0053] The magnetization direction of the permanent magnets 12 is parallel to the circumferential direction Y1 of the rotor 3, that is, two permanent magnets 12 adjacent to each other in the circumferential direction Y1 are magnetized so that the two magnetic pole faces facing each other in the circumferential direction Y1 have the same polarity.

[0054] The radially inner surface of the permanent magnet is in contact with the outer circumferential surface of the annular portion 20 of the resin member 14. As a result, the permanent magnet 12 is fixed to the rotor core 11.

[0055] Second embodiment In a plan view, the shape of the circumferential tip of the flange portion 10 may be any one of a circular arc, a straight line, and a combination of a circular arc and a straight line.

[0056] (1) Flange 8 shows the flange 10A in the second embodiment. The edge of the circumferential tip of the flange 10A consists of only straight lines in a plan view, specifically, a tip edge 104A (described later), a second outer circumferential edge 94A (described later), and an inner circumferential edge 92A (described later). Note that the basic structure and basic operation of the second embodiment are the same as those of the first embodiment, so the following description will focus on the differences.

[0057] As shown in FIG. 8, each flange 10A has a root 101A and a wide portion 102A in plan view. The root 101A is in contact with the tooth body 9A. The wide portion 102A is located on the circumferential tip side of the root 101A. The wide portion 102A has a width in a direction intersecting the circumferential direction Y1 (e.g., radial direction) longer than the width of the root 101A in a direction intersecting the circumferential direction Y1 (e.g., radial direction). In this embodiment, the edge on the outer periphery side of the flange 10A has a first outer periphery side edge 93A connected to the side edge 91A and smoothly recessed radially inward in plan view, and a second outer periphery side edge 94A extending circumferentially and radially outward from the first outer periphery side edge 93A. Therefore, the width of flange portion 10A (corresponding to part of wide portion 102A) at the circumferential outer position of second outer peripheral side edge 94A is longer than the width of flange portion 10A (corresponding to part of root portion 101A) at the circumferential inner position of first outer peripheral side edge 93A.

[0058] As described above, since the width of the wide portion 102A is greater than the width of the base portion 101A, the torque ripple can be reduced while maintaining the average torque.

[0059] (2) Plan view shape of flange Next, the shape of the flange portion 10A will be described in more detail with reference to the lines and points depicted in FIG.

[0060] Unlike the first embodiment, the flange portion 10A has a straight leading edge 104A at the circumferential leading end. The leading edge 104A is connected to the second outer peripheral side edge 94A to form a corner. The leading edge 104A is connected to the inner peripheral surface edge 92A to form a corner.

[0061] 8 shows a reference line A1, a straight line C1, a circular arc D1, a line segment E1, a straight line F1, an intersection point G1, and a line segment H1. Note that the following description relates to the shape of the flange portion 10A as viewed from the axial direction.

[0062] The reference line A1 is a straight line extending from the central axis X11. The reference line A1 is offset from the core center line (not shown) by an angle of (360 degrees / number of slots (12 in this embodiment) / 2).

[0063] The straight line C1 is a straight line partially coinciding with the second outer circumferential edge 94A of the flange portion 10A.

[0064] The arc D1 is a circular arc that partially coincides with the inner circumferential edge 92A of the tooth 8A.

[0065] The line segment E1 is a straight line that coincides with the tip edge 104A of the flange portion 10A. Specifically, the line segment E1 is parallel to the reference line A1 and extends between the straight line C1 and the circular arc D1.

[0066] The straight line F1 is a straight line partially coinciding with the side edge 91A of the tooth main body 9A.

[0067] Intersection point G1 is the intersection point of lines C1 and F1.

[0068] The line segment H1 is a straight line extending from the intersection point G1 toward a point on the arc D1 and is parallel to the line segment F1. The line segment H1 (an example of the width of the base portion 101A) is shorter than the line segment E1 (an example of the width of the wide portion 102A).

[0069] Third embodiment 9 shows a flange portion 10B in the third embodiment. Note that the basic structure and basic operation of the third embodiment are the same as those of the first embodiment, so the following description will focus on the differences.

[0070] (1) Flange 9 shows flange 10B in the third embodiment. The circumferential tip of flange 10B is made up of a combination of straight lines and curves, specifically, tip edge 104B (described later), chamfered edge 105B (described later), and chamfered edge 106B (described later). Note that the basic structure and basic operation of the third embodiment are the same as those of the first embodiment, so the following description will focus on the differences.

[0071] 9, each flange portion 10B has a root portion 101B and a wide portion 102B in a plan view. The root portion 101B is in contact with the tooth body 9B. The wide portion 102B is located on the circumferential tip side of the root portion 101B. The width of the wide portion 102B in a direction intersecting the circumferential direction Y1 is greater than the width of the root portion 101B in a direction intersecting the circumferential direction Y1.

[0072] In this embodiment, the outer peripheral edge of the flange portion 10B has a first outer peripheral edge 93B that is connected to the side edge 91B and is smoothly recessed radially inward in a plan view, and a second outer peripheral edge 94B that extends circumferentially outward and radially outward from the first outer peripheral edge 93B. Therefore, the width of the flange portion 10B (corresponding to a part of the wide portion 102B) at the circumferential outer position of the second outer peripheral edge 94B is longer than the width of the flange portion 10B (corresponding to a part of the root portion 101B) at the circumferential inner position of the first outer peripheral edge 93B.

[0073] As described above, since the width of the wide portion 102B is greater than the width of the base portion 101B, the torque ripple can be reduced while maintaining the average torque.

[0074] (2) Plan view shape of flange Next, the shape of flange portion 10B will be described in more detail with reference to the lines and points drawn in Fig. 9. Note that the following description relates to the shape of flange portion 10B as viewed from the axial direction.

[0075] The flange 10B has a straight leading edge 104B at its circumferential leading end, unlike the first embodiment, and further has arc-shaped chamfered edges 105B and 106B at both ends of a leading edge 140, unlike the second embodiment.

[0076] FIG. 9 shows a reference line A1, a straight line C1, a circular arc D1, a line segment E1, a straight line F1, an intersection point G1, and a line segment H1.

[0077] The reference line A1 is a straight line extending from the central axis X11. The reference line A1 is offset from the core center line (not shown) by an angle of (360 degrees / number of slots (12 in this embodiment) / 2).

[0078] The straight line C1 is a straight line partially coinciding with the second outer circumferential edge 94B of the flange portion 10B.

[0079] The arc D1 is a circular arc that partially coincides with the inner circumferential surface edge 92B of the tooth 8B.

[0080] The line segment E1 is a straight line that coincides with the tip edge 104B of the flange portion 10B. Specifically, the line segment E1 is parallel to the reference line A1 and extends between the straight line C1 and the circular arc D1.

[0081] The straight line F1 is a straight line partially coinciding with the side edge 91B of the tooth main body 9B.

[0082] Intersection point G1 is the intersection point of lines C1 and F1.

[0083] The line segment H1 is a straight line extending from the intersection point G1 toward a point on the arc D1 and is parallel to the line segment F1. The line segment H1 (an example of the width of the base portion 101B) is shorter than the line segment E1 (an example of the width of the wide portion 102B).

[0084] (Modification) The above-described embodiment is merely one of various embodiments of the present disclosure. The above-described embodiment can be modified in various ways depending on the design and the like as long as the object of the present disclosure can be achieved. Below, modifications of the above-described embodiment are listed. The modifications described below can be applied in appropriate combination.

[0085] (1) Modifications of the electric motor The rotor core and the stator core may be dust cores whose main component is a dust material obtained by compressing a powdered magnetic body.

[0086] (2) Modifications of permanent magnets The permanent magnet may be a bonded magnet made by mixing and kneading magnet powder, which is a hard magnetic material, with a binder such as resin or rubber and molding it into a molded magnet, or it may be a sintered magnet made by baking magnet powder at high temperature.

[0087] (Aspect) The present specification discloses the following aspects.

[0088] The stator (2) according to the first aspect includes a stator core (4) and a coil (6). The stator core (4) has a core back (7) and a plurality of teeth (8). The core back (4) is annular. The plurality of teeth (8) protrude from an inner peripheral edge of the core back (7) toward an axis (X1) of a rotating shaft (13) of the rotor (2). The coil (6) is formed by winding a conductive wire around the plurality of teeth (8). Each of the plurality of teeth (8) has a tooth body (9) and a flange portion (10, 10A, 10B) extending circumferentially from a tip of the tooth body (9). The flange portion (10, 10A, 10B) has a root portion (101, 101A, 101B) and a wide portion (102, 102A, 102B) located on the circumferential tip side of the root portion (101, 101A, 101B). When viewed from the axial direction, which is the direction in which the axis (X1) extends, the width of the wide portion (102, 102A, 102B) in a direction intersecting the circumferential direction (Y1) is wider than the width of the root portion (101, 101A, 101B) in a direction intersecting the circumferential direction (Y).

[0089] According to this aspect, the average torque can be increased while suppressing the torque ripple.

[0090] In the stator (2) according to the second aspect, in the first aspect, the angle (θ1) formed between the side edge (91) of the tooth main body (9) and the outer peripheral edge (94) of the flange portion when viewed from the axial direction is greater than or equal to 60 degrees and less than 105 degrees.

[0091] According to this aspect, the average torque can be increased while suppressing the torque ripple.

[0092] In the stator (2) according to the third aspect, in the first or second aspect, the flange portion (10) has a pair of flange portions (10, 10A, 10B) extending circumferentially from the tip of the tooth body (9) on both sides.

[0093] According to this aspect, the average torque can be increased while suppressing the torque ripple.

[0094] In the stator (2) according to the fourth aspect, in any of the first to third aspects, the circumferential distance between the tips of a pair of adjacent flange portions (10) arranged with a gap in the circumferential direction (Y1) among the flange portions (10) is 10% or more and 85% or less of the circumferential distance between the bases of the pair of adjacent flange portions (10).

[0095] According to this aspect, the average torque can be increased while suppressing the torque ripple.

[0096] In the stator (2) according to the fifth aspect, in any of the first to fourth aspects, the shape of the circumferential tip of the flange portion (10, 10A, 10B) when viewed from the axial direction includes any of a circular arc, a straight line, and a combination of a circular arc and a straight line.

[0097] According to this aspect, the degree of freedom in designing the flange portion is increased.

[0098] An electric motor according to a sixth aspect includes the stator according to any one of the first to fifth aspects, and a rotor.

[0099] According to this aspect, the average torque can be increased while suppressing the torque ripple. [Explanation of symbols]

[0100] 1: Electric motor 2: Stator 3: Rotor 4: Stator core 6: Coil 7: Coreback 8: Teeth 9: Teeth body 10, 10A, 10B: Tsubabe 12: Permanent magnet 13: Rotation axis 91: Side edge 92: Inner periphery edge 94: Second outer edge 101, 101A, 101B: Base part 102, 102A, 102B: Wide section 103: Circumferential tip X1: Axis center X11: Central axis center Y1: Circumferential direction θ1: Protrusion angle

Claims

1. a stator core having an annular core back and a plurality of teeth protruding from an inner peripheral edge of the core back toward an axis of a rotating shaft of a rotor; a coil in which a conductive wire is wound around the plurality of teeth, Each of the plurality of teeth includes A teeth body, a flange portion extending in a circumferential direction from a tip of the tooth body, The flange portion is A base portion and a wide portion located on the circumferential tip side of the base portion, the wide portion having a width in a direction intersecting the circumferential direction, the width being greater than the width of the base portion in the direction intersecting the circumferential direction, as viewed from the axial direction along which the axis extends; stator.

2. When viewed from the axial direction, an angle between a side edge of the tooth body and an outer peripheral edge of the flange portion is equal to or greater than 60 degrees and less than 105 degrees. The stator according to claim 1 .

3. The flange portion has a pair of flange portions extending circumferentially from the tip end of the tooth body on both sides.

3. A stator according to claim 1 or 2.

4. a circumferential distance between tips of a pair of adjacent flanges arranged with a gap in the circumferential direction among the flanges is 10% or more and 85% or less of a circumferential distance between bases of the pair of adjacent flanges; The stator according to claim 3.

5. When viewed from the axial direction, the shape of the circumferential tip portion of the flange portion includes any one of a circular arc, a straight line, and a combination of a circular arc and a straight line.

3. A stator according to claim 1 or 2.

6. A stator according to claim 1 or 2; A rotor; Electric motor.

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