Stator, electric motor, and air blower

Abstract

A stator (1) comprises: a stator body (10) that has a stator core (40) and magnetic flux capturing members (61, 62) provided at the axial direction ends (42c, 42d) of the stator core (40); a winding (20) wound on the stator core (40); and a first insulating member (30) that insulates the stator body (10) and the winding (20). The first insulating member (30) has a first part (33) provided between the magnetic flux capturing members (61, 62) and the winding (20). The thickness (t1) of the first part (33) in the radial direction of the stator core (40) decreases towards the axial end (30e) of the first insulating member (30).

Description

Stators, motors and fans

[0001] The present disclosure relates to a stator, an electric motor, and a blower.

[0002] A known configuration of an electric motor stator is one in which extensions made of multiple plates are arranged on the axial end faces of the teeth of the stator core (see, for example, Patent Document 1). The stator in Patent Document 1 is provided with an insulating portion that insulates the extensions from the windings (coils).

[0003] JP 2014-124007 A (see FIG. 1)

[0004] However, the configuration of Patent Document 1 has a problem in that the insulating portion is deformed due to stress generated in the insulating portion when the winding is wound. If the deformed insulating portion presses against the extension portion and the extension portion comes into contact with the rotor, noise is generated.

[0005] The present disclosure aims to suppress deformation of insulating members in a stator.

[0006] A stator according to one aspect of the present disclosure comprises a stator body having a stator core and a magnetic flux intake member provided at an axial end of the stator core, a winding wound around the stator core, and a first insulating member that insulates the stator body from the winding, the first insulating member having a first portion provided between the magnetic flux intake member and the winding, and the radial thickness of the first portion of the stator core becoming thinner toward the axial end of the first insulating member.

[0007] An electric motor according to another aspect of the present disclosure includes the above-described stator and a rotor.

[0008] A blower according to another aspect of the present disclosure includes the above-described electric motor and an impeller driven by the electric motor.

[0009] According to the present disclosure, deformation of the insulating member in the stator can be suppressed.

[0010] FIG. 1 is a partial side view schematically showing a part of the configuration of an electric motor according to embodiment 1. FIG. 2 is a cross-sectional view of the stator shown in FIG. 1 taken along line A2-A2. FIG. 3 is a perspective view showing a part of the configuration of a stator main body shown in FIGS. 1 and 2. FIG. 4 is a cross-sectional view schematically showing a part of the configuration of the stator shown in FIGS. 1 and 2. FIG. 5 is an enlarged cross-sectional view showing the configuration around the magnetic flux take-in member shown in FIG. 4. FIG. 6 is a cross-sectional view schematically showing a part of the configuration of a stator according to modified example 1 of embodiment 1. FIG. 7 is a cross-sectional view schematically showing a part of the configuration of a stator according to modified example 2 of embodiment 1. FIG. 8 is a cross-sectional view schematically showing a part of the configuration of a stator according to modified example 2 of embodiment 2. FIG. 9 is a cross-sectional view schematically showing a part of the configuration of a stator according to modified example 2 of embodiment 2. FIG. 10 is a cross-sectional view schematically showing a part of the configuration of an electric motor according to embodiment 3. FIG. 11 is a cross-sectional view schematically showing a part of the configuration of a stator according to embodiment 4. FIG. 12 is a cross-sectional view schematically showing a part of the configuration of a stator according to modified example 4. FIG. 13 is a partial cross-sectional view schematically showing the configuration of a blower according to embodiment 5.

[0011] A stator, a motor, and a blower according to embodiments of the present disclosure will be described below with reference to the drawings. The following embodiments are merely examples, and the embodiments can be appropriately combined and modified.

[0012] To facilitate understanding of the relationships between the drawings, each figure shows an xyz Cartesian coordinate system. The z-axis is a coordinate axis parallel to the axis of the motor rotor shaft. The x-axis is a coordinate axis perpendicular to the z-axis. The y-axis is a coordinate axis perpendicular to both the x-axis and the z-axis.

[0013] <First Embodiment> <Configuration of Electric Motor 100> Fig. 1 is a partial side view that schematically shows a part of the configuration of an electric motor 100 according to the first embodiment. As shown in Fig. 1, the electric motor 100 has a stator 1 and a rotor 5. The rotor 5 is disposed inside the stator 1. In other words, the electric motor 100 is an inner rotor type electric motor.

[0014] The rotor 5 has a shaft 51 as a rotation axis and a permanent magnet 52 as a rotor body. The rotor 5 is rotatable around the axis A of the shaft 51. In the following description, the direction along the circumference of a circle centered on the axis A of the shaft 51 will be referred to as the "circumferential direction C." The z-axis direction will also be referred to as the "axial direction," and the direction perpendicular to the axial direction will also be referred to as the "radial direction."

[0015] The permanent magnet 52 is attached to the shaft 51. In the example shown in Fig. 1, the permanent magnet 52 is a cylindrical magnet that is long in the z-axis direction. N poles and S poles are alternately formed on the outer circumferential surface 52c of the permanent magnet 52. The rotor body of the rotor 5 may be composed of a rotor core fixed to the shaft 51 and a permanent magnet attached to the rotor core.

[0016] <Configuration of Stator 1> Next, the configuration of the stator 1 will be described. Figure 2 is a cross-sectional view of the stator 1 shown in Figure 1 taken along line A2-A2. As shown in Figures 1 and 2, the stator 1 has a stator body 10, a winding 20, and an insulator 30 as a first insulating member.

[0017] Fig. 3 is a perspective view showing a part of the configuration of the stator body 10 shown in Figs. 1 and 2. As shown in Fig. 3, the stator body 10 has a stator core 40 and magnetic flux intake members 61 and 62.

[0018] <Stator core 40> The stator core 40 has a yoke 41 extending in the circumferential direction C and a plurality of teeth 42. The plurality of teeth 42 are arranged at predetermined intervals in the circumferential direction C. Between two of the plurality of teeth 42 adjacent to each other in the circumferential direction C, a slot 43 is provided, which is a space for accommodating the winding 20 and the insulator 30 (see FIGS. 1 and 2 ).

[0019] The multiple teeth 42 face the rotor 5 (see FIG. 1) in the radial direction. Each tooth 42 of the multiple teeth 42 has a tooth main body 42a and a tooth tip 42b. The tooth main body 42a extends radially inward from the yoke 41. The winding 20 (see FIG. 2) is wound around the tooth main body 42a via the insulator 30. The tooth tip 42b is positioned radially inward of the tooth main body 42a and is wider in the circumferential direction C than the tooth main body 42a. The tooth tip 42b has an end face 42c facing the +z-axis direction and an end face 42d facing the −z-axis direction. The end faces 42c and 42d on both sides of the tooth tip 42b in the z-axis direction constitute the end of the stator core 40 in the z-axis direction.

[0020] 1, the relationship between the length of the stator core 40 in the z-axis direction and the length of the permanent magnet 52 in the z-axis direction will be described. The stator core 40 has one axial end face 40a facing the +z-axis direction, and the other axial end face 40b facing the −z-axis direction. Furthermore, the above-mentioned permanent magnet 52 has one axial end face 52a facing the +z-axis direction, and the other axial end face 52b facing the −z-axis direction.

[0021] When a first length (hereinafter also referred to as "axial length"), which is the length of the stator core 40 in the z-axis direction, is L1 and a second length, which is the length of the permanent magnet 52 in the z-axis direction, is L2, the length L1 is shorter than the length L2. In other words, the lengths L1 and L2 satisfy the following equation (1): L1<L2 (1)

[0022] FIG. 4 is a cross-sectional view schematically illustrating a portion of the configuration of the stator 1 shown in FIGS. 1 and 2 . As shown in FIG. 4 , the stator core 40 has a plurality of electromagnetic steel sheets 45 stacked in the z-axis direction. Because the length L1 of the stator core 40 in the z-axis direction is shorter than the length L2 of the permanent magnet 52 in the z-axis direction, the number of electromagnetic steel sheets 45 is reduced, thereby reducing the cost of the stator core 40. This reduces the cost of the electric motor 100. Furthermore, the length (circumferential length) of the winding 20 is also shortened, thereby reducing the resistance value of the winding 20. This prevents a decrease in loss in the electric motor 100. In other words, the efficiency of the electric motor 100 can be improved.

[0023] 1, the end face 40a of the stator core 40 facing the +z-axis direction and the end face 40b of the stator core 40 facing the −z-axis direction are disposed between the end face 52a of the permanent magnet 52 facing the +z-axis direction and the end face 52b of the permanent magnet 52 facing the −z-axis direction. Note that it is sufficient that at least one of the end faces 40a of the stator core 40 facing the +z-axis direction and the end face 40b of the stator core 40 facing the −z-axis direction is disposed between the end face 52a of the permanent magnet 52 facing the +z-axis direction and the end face 52b of the permanent magnet 52 facing the −z-axis direction. For example, the end face 40b of the stator core 40 facing the −z-axis direction may be located axially outward of the end face 52b of the permanent magnet 52 facing the −z-axis direction.

[0024] As described above, in the electric motor 100, the length L1 of the stator core 40 in the z-axis direction is shorter than the length L2 of the permanent magnets 52 in the z-axis direction. In general, in an electric motor, the axial length of the stator core is the same as the axial length of the rotor body. Increasing the magnetic force of the rotor is an effective way to improve the efficiency of the electric motor, but high-magnetic-force permanent magnets are expensive. Furthermore, when inexpensive, low-magnetic-force permanent magnets (e.g., ferrite magnets) are used, the motor volume increases to compensate for the decrease in magnetic force. This increases the costs of the electromagnetic steel sheets 45 (see FIG. 4 ) and windings. In the first embodiment, the length L1 of the stator core 40 in the z-axis direction is shorter than the length L2 of the permanent magnets 52 in the z-axis direction. Because the number of electromagnetic steel sheets 45 included in the stator core 40 is reduced, the cost of the stator core 40 can be reduced. Therefore, the cost of the electric motor 100 can be reduced.

[0025] However, if the length of the stator core in the z-axis direction is made shorter than the length of the rotor body (permanent magnet 52 in the first embodiment), the amount of magnetic flux from the permanent magnet drawn into the stator core decreases, resulting in a decrease in the efficiency of the electric motor. In particular, the magnetic flux generated at the end of the rotor body in the z-axis direction that is not radially opposed to the stator core (hereinafter also referred to as the "overhanging portion") becomes less likely to flow to the stator core. If the amount of magnetic flux flowing from the rotor body to the stator core decreases in this way, the output and efficiency of the electric motor may decrease.

[0026] In the first embodiment, the stator body 10 has magnetic flux take-in members 61, 62 made of a magnetic material that take in the magnetic flux of the permanent magnet 52. This allows the magnetic flux generated in the overhanging portion of the permanent magnet 52 to easily flow through the magnetic flux take-in members 61, 62 to the stator core 40 and the windings 20. Therefore, according to the first embodiment, it is possible to reduce the cost of the electric motor 100 while preventing a decrease in the output and efficiency of the electric motor 100. Therefore, even if an inexpensive, low-coherence magnet (e.g., a ferrite magnet) is used as the permanent magnet 52 in the rotor 5 of the electric motor 100, the magnetic flux take-in members 61, 62 take in the magnetic flux of the permanent magnet, so there is no need to increase the axial length of the stator core 40 or the height of the windings 20 in the z-axis direction. Therefore, in the electric motor 100, it is possible to reduce costs while preventing a decrease in the output and efficiency of the electric motor 100.

[0027] 3 and 4, the configuration of the magnetic flux take-in members 61 and 62 will be described. The magnetic flux take-in members 61 and 62 are, for example, metal pieces made of a metal material. Specifically, the magnetic flux take-in members 61 and 62 are iron pieces made of iron.

[0028] The multiple magnetic flux intake members 61, 62 are arranged at intervals from each other in the circumferential direction C. Specifically, magnetic flux intake member 61 is arranged on end face 42c of tooth tip portion 42b facing the +z-axis direction, and magnetic flux intake member 62 is arranged on end face 42d of tooth tip portion 42b facing the −z-axis direction.

[0029] In this manner, the magnetic flux take-up members 61, 62 are disposed at the tooth tip portions 42b of the teeth 42. This allows the magnetic flux take-up members 61, 62 to be disposed closer to the permanent magnet 52 (see FIG. 1 ), making it easier for the magnetic flux of the permanent magnet 52 to be taken in by the magnetic flux take-up members 61, 62, compared to a configuration in which the magnetic flux take-up members 61, 62 are disposed at the tooth main body portions 42a. In the following description, when it is not necessary to distinguish between the magnetic flux take-up members 61, 62, the magnetic flux take-up members 61, 62 will be collectively referred to as the "magnetic flux take-up member 60." As shown in FIG. 10 (described later), the stator main body 10 can be realized without the magnetic flux take-up member 62. In other words, it is sufficient that the magnetic flux take-up member 60 is disposed at at least one of the end faces 42c, 42d, 42c of the tooth tip portions 42b, facing the +z-axis direction and the -z-axis direction.

[0030] <Insulator 30> Next, the configuration of the insulator 30 will be described with reference to Figures 2, 4, and 5. As shown in Figure 2, the insulator 30 is provided between the stator body 10 and the windings 20. The insulator 30 insulates the stator body 10 from the windings 20.

[0031] The insulator 30 has a first insulating portion 30a and a second insulating portion 30b. The first insulating portion 30a is a portion of the insulator 30 that insulates the tooth tip portions 42b from the windings 20 and also insulates the magnetic flux intake members 60 from the windings 20. The second insulating portion 30b is a portion of the insulator 30 that insulates the tooth main portions 42a from the windings 20.

[0032] As described above, by providing the stator body 10 with the magnetic flux intake members 60, it is possible to reduce the cost of the stator 1 while preventing a decrease in the efficiency and output of the electric motor 100. However, stress from the windings 20 acts on the surface of the first insulating portion 30a of the insulator 30 facing the windings 20 (i.e., the radially outward surface 31). The stress generated on the radially outward surface 31 of the insulator 30 (hereinafter referred to as "winding stress F １ , F ２ ) occurs when the winding 20 is wound around the teeth 42.

[0033] The insulator 30 may be deformed by the winding stress. Specifically, the radially outward surface 31 of the insulator 30 may collapse toward the magnetic flux take-in member 61 due to the winding stress. In this case, if the insulator 30 comes into contact with the magnetic flux take-in member 61 and presses it, the magnetic flux take-in member 61 may also deform toward the rotor 5, possibly causing contact between the magnetic flux take-in member 61 and the rotor 5.

[0034] The teeth 42 are also subjected to the winding stress F ２ acts through the insulator 30, but the teeth 42 are difficult to deform. This is because the shape of the teeth 42 when viewed in the z-axis direction is T-shaped, and the moment of inertia is large. Therefore, the portion of the insulator 30 that is supported by the teeth 42 (specifically, the tooth tip portions 42b) is subjected to the winding stress F ２ On the other hand, because the shape of the magnetic flux take-in member 61 when viewed in the z-axis direction is rectangular, the second moment of area of ​​the magnetic flux take-in member 61 is smaller than the second moment of area of ​​the teeth 42. Therefore, the portion of the insulator 30 that overlaps with the magnetic flux take-in member 61 in the z-axis direction is more likely to deform.

[0035] 5 is an enlarged cross-sectional view showing the configuration around the magnetic flux take-in member 61 shown in FIG. 4. As shown in FIG. 5, when the radial thickness of the first portion 33 of the insulator 30, which is the portion provided between the magnetic flux take-in member 61 and the winding 20, is defined as t1, the thickness t1 becomes thinner toward the end 30e of the insulator 30 in the z-axis direction (i.e., the end facing outward in the axial direction). In other words, the thickness t1 becomes thinner toward the end 30e of the insulator 30 in the z-axis direction. As a result, the winding stress F acting on the insulator 30 １ Therefore, the winding stress F １ This can suppress deformation of the insulator 30 (i.e., tilting toward the magnetic flux take-in member 60) due to the force applied to the insulator 30. Therefore, the magnetic flux take-in member 62 is also less likely to deform, which reduces the likelihood of contact between the magnetic flux take-in member 62 and the rotor 5 (see FIG. 1 ), thereby suppressing noise generation in the electric motor 100.

[0036] When the radial thickness of the second portion 34 of the insulator 30, which is the portion provided between the stator core 40 and the winding 20, is t2, the thickness t1 is thinner than the thickness t2. As a result, the above-mentioned effect, i.e., the winding stress F １ This can suppress deformation of the insulator 30 (i.e., tilting toward the magnetic flux intake member 60 ) caused by the impact.

[0037] In the first embodiment, the radially outward surface 31 of the insulator 30 has a first inclined portion 31 a. The first inclined portion 31 a is inclined so that the radial position thereof approaches the magnetic flux intake member 60 (i.e., moves away from the winding 20) as it approaches the end 30 e of the insulator 30 in the z-axis direction. In the example shown in Fig. 5, the first inclined portion 31 a is inclined so that the radial distance from the axis A (Fig. 1) decreases as it approaches the end 30 e of the insulator 30 in the z-axis direction.

[0038] The first inclined portion 31 a is provided on the radially outward surface 31 of the insulator 30 at a portion that overlaps with the magnetic flux intake member 61 in the z-axis direction. １ is the winding stress F acting on the portion of the radially outward surface 31 that overlaps with the tooth 42 in the z-axis direction. ２ Therefore, the insulator 30 can reduce the winding stress F １ Since the magnetic flux intake member 61 is less likely to deform due to the axial force, it is less likely to come into contact with the rotor 5. Therefore, it is possible to suppress noise generation in the electric motor 100.

[0039] Furthermore, in the first embodiment, the surface 32 of the insulator 30 facing the magnetic flux take-in member 61 (i.e., the surface facing inward in the radial direction) has a second inclined portion 32a. The second inclined portion 32a is inclined so that the radial position thereof approaches the winding 20 (i.e., moves away from the magnetic flux take-in member 60) as it approaches the end 30e of the insulator 30 in the z-axis direction. In the example shown in Fig. 5, the second inclined portion 32a is inclined so that the radial distance from the axis A (Fig. 1) increases as it approaches the end 30e of the insulator 30 in the z-axis direction.

[0040] The second inclined portion 32a is provided on the radially inward surface 32 of the insulator 30 at a portion that overlaps with the magnetic flux take-in member 61 in the z-axis direction. This makes it less likely that the insulator 30 will come into contact with the magnetic flux take-in member 61. Therefore, noise generated in the electric motor 100 can be further suppressed.

[0041] As described above, in the first embodiment, the insulator 30 has the first inclined portion 61a and the second inclined portion 62a. As a result, the radial thickness t1 of the first portion 33 of the insulator 30, which is provided between the magnetic flux take-in member 61 and the winding 20, becomes thinner as it approaches the end 30e of the insulator 30 in the z-axis direction. The insulator 30 can also be realized by having either the first inclined portion 61a or the second inclined portion 62a. Furthermore, the insulator 30 may have a first portion 33 that insulates the magnetic flux take-in member 60 from the winding 20 and a second portion 34 that insulates the stator core 40 from the winding 20 as separate bodies. Furthermore, at least one of the radially outward surface 31 and the radially inward surface 32 of the insulator 30 may have a step portion, so that the thickness t1 becomes thinner as it approaches the end 30e of the insulator 30 in the z-axis direction.

[0042] <Windings 20> Next, returning to FIG. 1 , the configuration of the windings 20 will be described. The windings 20 are wound around the teeth 42 of the stator core 40. The windings 20 are made of, for example, aluminum wire, which is cheaper than copper wire. This reduces the cost of the electric motor 100. As described above, in the electric motor 100, the axial length of the stator core 40 (i.e., length L1) is shorter than the axial length of the permanent magnets 52 (i.e., length L2). In this case, the circumferential length of the windings 20 is also shorter, and therefore the resistance value of the windings 20 is also reduced. As a result, even when aluminum wire, which has a lower conductivity than copper wire, is used for the windings 20, the cost of the electric motor 100 can be reduced while suppressing an increase in resistance value.

[0043] Effect of First Embodiment According to the first embodiment described above, the length L1 of the stator core 40 in the z-axis direction is shorter than the length L2 of the permanent magnet 52 in the z-axis direction. This reduces the number of electromagnetic steel sheets 45 used in the stator core 40, thereby reducing the cost of the stator 1. Therefore, the cost of the electric motor 100 can be reduced.

[0044] Furthermore, according to the first embodiment, the stator 1 has magnetic flux intake members 60 made of a magnetic material that take in the magnetic flux of the permanent magnets 52. This allows the magnetic flux generated in the overhanging portions of the permanent magnets 52 to flow through the stator core 40 and the windings 20 via the magnetic flux intake members 60. This makes it possible to suppress a decrease in the amount of magnetic flux flowing from the permanent magnets 52 to the stator 1. This makes it possible to suppress a decrease in the output and efficiency of the electric motor 100.

[0045] Furthermore, according to the first embodiment, the insulator 30 has a first portion 33 provided between the magnetic flux intake member 60 and the winding 20, and the radial thickness t1 of the first portion 33 becomes thinner toward the end 30e of the insulator 30 in the z-axis direction. １ Therefore, the winding stress F １ This can suppress deformation of the insulator 30 (i.e., tilting toward the magnetic flux take-in member 60) due to the force applied to the insulator 30. Therefore, the magnetic flux take-in member 60 is also less likely to deform, which makes it less likely for the magnetic flux take-in member 60 to come into contact with the rotor 5, thereby suppressing noise generation in the electric motor 100.

[0046] According to the first embodiment, the radially outward surface 31 of the insulator 30, which faces the winding 20, has a first inclined portion 31a. The first inclined portion 31a is inclined so that the radial position approaches the magnetic flux intake member 60 (i.e., moves away from the winding 20) as it approaches the end 30e of the insulator 30 in the +z-axis direction. This allows the insulator 30 to reduce the winding stress F １ As a result, the magnetic flux intake member 60 is less likely to be deformed, and therefore the magnetic flux intake member 60 is less likely to come into contact with the rotor 5. Therefore, the generation of noise in the electric motor 100 can be suppressed.

[0047] Furthermore, according to the first embodiment, the radially inward surface 32 of the insulator 30, which faces the magnetic flux take-in member 60, has a second inclined portion 32a. The second inclined portion 32a is inclined so that the radial position approaches the winding 20 (i.e., moves away from the magnetic flux take-in member 60) as it approaches the end 30e of the insulator 30 in the +z-axis direction. This makes it less likely that the insulator 30 and the magnetic flux take-in member 60 will come into contact with each other. This makes it possible to further suppress noise generation in the electric motor 100.

[0048] In the first embodiment, the electric motor 100 is described as an inner rotor type electric motor, but the above-mentioned effects can also be achieved in an outer rotor type electric motor in which the rotor 5 is arranged outside the stator 1.

[0049] <<First Modification of First Embodiment>> Figure 6 is a cross-sectional view that schematically shows a portion of the configuration of a stator 1A according to a first modification of the first embodiment. In Figure 6, components that are the same as or correspond to components shown in Figure 4 are assigned the same reference numerals as those shown in Figure 4. The stator 1A according to the first modification of the first embodiment differs from the stator 1 according to the first embodiment in the shape of the magnetic flux intake member 60A. In all other respects, the stator 1A according to the first modification of the first embodiment is the same as the stator 1 according to the first embodiment. Therefore, Figure 1 will be referenced in the following description.

[0050] 6, the stator 1A has a stator body 10A, windings 20, and insulators 30. The stator body 10A has a stator core 40 including teeth 42, and magnetic flux intake members 60A arranged on end faces 42c of the tooth tip portions 42b facing the +z-axis direction.

[0051] The radially outward surface 60c of the magnetic flux take-in member 60A is in contact with the second inclined portion 32a of the insulator 30. This makes it difficult for the magnetic flux take-in member 60A to come into contact with the rotor 5 (see FIG. 1), thereby further suppressing noise generation in the stator 1A.

[0052] Furthermore, the radially inward surface 60d of the magnetic flux take-in member 60A is inclined so that the radial position approaches the winding 20 the closer it is to the end 60e of the magnetic flux take-in member 60A in the +z-axis direction. As a result, the radially inward surface 60d is located closer to the insulator 30 than the cylindrical surface S including the radially inward surface 42e of the tooth tip portion 42b. This makes it less likely that the magnetic flux take-in member 60A will come into contact with the rotor 5 (see FIG. 1). This further reduces noise generation in the stator 1A.

[0053] Effect of the First Modification of the First Embodiment According to the first modification of the first embodiment described above, the radially outward surface 60c of the magnetic flux take-in member 60A is in contact with the second inclined portion 32a of the insulator 30. This makes it difficult for the magnetic flux take-in member 60A to come into contact with the rotor 5 (see FIG. 1 ). This makes it possible to further suppress noise generation in the stator 1A.

[0054] <<Second Modification of First Embodiment>> Figure 7 is a cross-sectional view that schematically shows a portion of the configuration of a stator 1B according to a second modification of the first embodiment. In Figure 7, components that are the same as or correspond to components shown in Figure 4 are assigned the same reference numerals as those shown in Figure 4. The stator 1B according to the second modification of the first embodiment differs from the stator 1 according to the first embodiment in that it further includes a molded resin portion 70. In all other respects, the stator 1B according to the second modification of the first embodiment is the same as the stator 1 according to the first embodiment.

[0055] As shown in FIG. 7, the stator 1B has a stator body 10, a winding 20, an insulator 30, and a molded resin portion 70 as a second insulating member.

[0056] The molded resin portion 70 is made of, for example, a thermosetting resin and is formed by, for example, injection molding. The molded resin portion 70 is integrated with the stator body 10, the windings 20, and the insulators 30 by integral molding.

[0057] The molded resin portion 70 fixes the magnetic flux take-in member 60 to the stator core 40. This improves the rigidity of the stator body 10, thereby suppressing vibration of the magnetic flux take-in member 60 due to electromagnetic force, thereby achieving low noise in an electric motor having the stator 1B.

[0058] 7, the molded resin portion 70 fixes the insulator 30 to the stator core 40. This further suppresses deformation of the insulator 30 due to winding stress.

[0059] 7, molded resin portion 70 fixes windings 20 to stator core 40. This prevents windings 20 from vibrating due to magnetic force or Lorentz force when current is applied, further reducing noise generation in stator 1B.

[0060] Furthermore, when the winding 20 is made of aluminum wire, the tensile strength of the aluminum wire is lower than that of copper wire. Therefore, the tensile strength of the winding 20 is lower when the winding 20 is wound around the stator core 40, and the force with which the winding 20 is fixed to the stator core 40 is reduced. In this case, the winding 20 is more likely to vibrate when a current is applied to the winding 20. In the second modification of the first embodiment, the molded resin portion 70 covers the winding 20. This makes it possible to suppress vibration of the winding 20 even when a current is applied to the winding 20 made of aluminum wire. Therefore, by using aluminum wire for the winding 20 and covering the winding 20 with the molded resin portion 70, the cost of the stator 1B can be further reduced while further suppressing noise generation in the stator 1B. To further reduce noise, the winding 20 may be made of aluminum alloy wire, which has a tensile strength greater than that of aluminum wire.

[0061] Effect of Modification 2 of Embodiment 1 According to the above-described Modification 2 of Embodiment 1, stator 1B further includes molded resin portion 70 that fixes magnetic flux take-in members 60 to stator core 40. This improves the rigidity of stator body 10, thereby making it possible to suppress vibration of magnetic flux take-in members 60 due to electromagnetic force.

[0062] Furthermore, according to the second modification of the first embodiment, the molded resin portion 70 fixes the insulator 30 to the stator core 40. This makes it possible to further suppress deformation of the insulator 30 due to winding stress.

[0063] Furthermore, according to the second modification of the first embodiment, molded resin portion 70 fixes windings 20 to stator core 40. This prevents windings 20 from vibrating due to magnetic force or Lorentz force when current is applied, thereby further reducing noise generation in stator 1B.

[0064] <<Embodiment 2>> Fig. 8 is a cross-sectional view that schematically shows a portion of the configuration of a stator 2 according to embodiment 2. In Fig. 8, components that are the same as or correspond to components shown in Fig. 4 are assigned the same reference numerals as those shown in Fig. 4. The stator 2 according to embodiment 2 differs from the stator 1 according to embodiment 1 in the shape of the insulator 230. In all other respects, the stator 2 according to embodiment 2 is the same as the stator 1 according to embodiment 1. Therefore, Fig. 1 will be referenced in the following description.

[0065] As shown in FIG. 8 , the stator 2 includes a stator body 10 , a winding 20 , and an insulator 230 .

[0066] The entire radially outward surface 231 of the insulator 230 (i.e., the surface facing the windings 20) is inclined so that the radial position approaches the magnetic flux intake member 60 (i.e., moves away from the windings 20) as it approaches the end 30 e of the insulator 230 in the +z-axis direction. In the example shown in Fig. 8, the radially outward surface 231 of the insulator 230 is inclined so that the radial distance from the axis A (Fig. 1) decreases as it approaches the end 30 e of the insulator 230 in the +z-axis direction.

[0067] As a result, the winding stress F acting on the radially outward surface 231 １１ , F １２ , F １３becomes smaller as it approaches the end 30e in the +z-axis direction. Therefore, compared to the configuration shown in Fig. 4, it is possible to reduce the stress acting on the portion of the radially outward surface 231 where the boundary between the magnetic flux take-in member 60 and the stator core 40 overlaps in the z-axis direction. Therefore, the insulator 230 is less likely to deform due to winding stress, and the magnetic flux take-in member 60 and the rotor 5 (see Fig. 1) are less likely to come into contact with each other. Therefore, it is possible to suppress noise generation in the stator 2.

[0068] The winding 20 has a protrusion (i.e., coil end portion) 21 that covers an end surface 230c of the insulator 230 facing the +z-axis direction. In the example shown in FIG. 8 , the axial height H ２ is the axial height H from the end face 230c of the radially central portion of the protrusion 21. １ In other words, the axial height of the protruding portion 21 of the winding 20 from the end face 230c decreases as it approaches the radially outward surface 231 of the insulator 230. This reduces the contact area between the winding 20 and the radially outward surface 231 of the insulator 230, thereby reducing the winding stress acting on the insulator 230. Therefore, the insulator 230 is less likely to deform due to the winding stress, and the magnetic flux intake member 60 and the rotor 5 (see FIG. 1) are even less likely to come into contact with each other.

[0069] Effect of Second Embodiment According to the second embodiment described above, the entire radially outward surface 231 of the insulator 230 is inclined so that the radial position approaches the magnetic flux take-in member 60 (i.e., moves away from the windings 20) the closer it is to the end 30e of the insulator 230 in the +z-axis direction. This makes it possible to suppress deformation of the insulator 230 due to winding stress. Therefore, the magnetic flux take-in member 60 is also less likely to deform, which makes it less likely for the magnetic flux take-in member 60 to come into contact with the rotor 5, thereby suppressing noise generation in the electric motor.

[0070] According to the second embodiment, the winding 20 has a protruding portion 21 that protrudes in the axial direction from the end surface 230c of the insulator 230 that faces the +z-axis direction, and the height H of the radially inner portion of the protruding portion 21 is２ is the height H of the radially central portion of the protrusion 21 １ This reduces the contact area between the winding 20 and the radially outward surface 231 of the insulator 230, thereby reducing the winding stress acting on the insulator 230. Therefore, deformation of the insulator 230 due to the winding stress can be further suppressed.

[0071] <<Modification of Second Embodiment>> Figure 9 is a cross-sectional view that schematically shows a portion of the configuration of a stator 2A according to a modification of the second embodiment. In Figure 9, components that are the same as or correspond to components shown in Figure 8 are assigned the same reference numerals as those shown in Figure 8. The stator 2A according to the modification of the second embodiment differs from the stator 2 according to the second embodiment in that a gap d is provided between the insulator 230 and the windings 20. In all other respects, the stator 2A according to the modification of the second embodiment is the same as the stator 2 according to the second embodiment.

[0072] 9 , a gap d is provided between the insulator 230 and the winding 20 in the radial direction. Specifically, the gap d is provided between the winding 20 and a portion of the radially outward surface 231 of the insulator 230 that overlaps in the z-axis direction with an end face 42 c of the tooth tip portion 42 b facing the +z-axis direction. This makes it difficult for winding stress to act on the insulator 230. Therefore, deformation of the insulator 230 due to winding stress can be further suppressed.

[0073] Effect of the Modification of Second Embodiment According to the modification of the second embodiment described above, a gap d is provided between the insulator 230 and the winding 20. This makes it possible to further suppress deformation of the insulator 230 due to winding stress. This also makes it difficult for the magnetic flux take-in member 60 to deform, which makes it difficult for the magnetic flux take-in member 60 to come into contact with the rotor 5, thereby suppressing noise generation in the electric motor.

[0074] Third Embodiment Fig. 10 is a cross-sectional view that schematically shows a portion of the configuration of an electric motor 300 according to a third embodiment. In Fig. 10, components that are the same as or correspond to components shown in Fig. 1 are assigned the same reference numerals as those shown in Fig. 1. The electric motor 300 according to the third embodiment differs from the electric motor 100 according to the first embodiment in that the stator 3 does not have a magnetic flux intake member 62, for example. In all other respects, the electric motor 300 according to the third embodiment is the same as the electric motor 100 according to the first embodiment. Therefore, Figs. 1 and 2 will be referenced in the following description.

[0075] 10 , the electric motor 300 has a stator 3 and a rotor 5. The stator 3 has a stator body 310, a winding 20, and an insulator 30.

[0076] The stator body 310 has a stator core 40 and magnetic flux take-in members 61. In the third embodiment, the stator 3 has only the magnetic flux take-in members 61 arranged on the end faces 42 c of the tooth tips 42 b facing the +z-axis direction. This reduces the number of parts in the electric motor 300 and simplifies the assembly process of the electric motor 300.

[0077] 10, when the center position of the stator 3 in the z-axis direction is defined as center position P3 and the center position of the rotor 5 in the z-axis direction is defined as center position P5, center position P3 is shifted from center position P5 to the opposite side of magnetic flux take-in member 61 (i.e., the -z-axis side). This makes it easier for magnetic flux take-in member 61 to take in the magnetic flux of permanent magnet 52.

[0078] 10 , the portion 32c of the radially inward surface 32 of the insulator 30 opposite to the portion 32b facing the magnetic flux intake member 61 is positioned closer to the windings 20 than the radially inward surface 42e of the tooth tip portion 42b. This increases the gap between the outer peripheral surface 52c of the permanent magnet 52 and the radially inward surface 32 of the insulator 30. Therefore, even if the insulator 30 is deformed by winding stress, contact between the radially inward surface 32 of the insulator 30 and the rotor 5 can be prevented.

[0079] Effect of Third Embodiment According to the third embodiment described above, the only magnetic flux take-in member provided in the stator 3 of the electric motor 300 is the magnetic flux take-in member 61. This reduces the number of parts in the electric motor 300 and simplifies the assembly process of the electric motor 300.

[0080] Furthermore, according to the third embodiment, the center position P3 of the rotor 5 in the z-axis direction is shifted toward the magnetic flux take-in member 61 with respect to the center position P3 of the stator 3 in the z-axis direction. This makes it easier for the magnetic flux take-in member 61 to take in the magnetic flux of the permanent magnet 52. This makes it possible to prevent a decrease in the efficiency and output of the electric motor 300.

[0081] Furthermore, according to the third embodiment, the radially inward surface 32 of the insulator 30 is disposed closer to the windings 20 than the radially inward surface 42e of the tooth tip portion 42b. This increases the gap between the outer peripheral surface 52c of the permanent magnet 52 and the radially inward surface 32 of the insulator 30. Therefore, even if the insulator 30 is deformed by winding stress, contact between the radially inward surface 32 of the insulator 30 and the rotor 5 can be prevented.

[0082] <<Fourth Embodiment>> Fig. 11 is a cross-sectional view that schematically shows a part of the configuration of a stator 4 according to a fourth embodiment. In Fig. 11, components that are the same as or correspond to components shown in Fig. 4 are assigned the same reference numerals as those shown in Fig. 4. The stator 4 according to the fourth embodiment differs from the stator 1 according to the first embodiment in the configuration of the magnetic flux intake member 460. In all other respects, the stator 4 according to the fourth embodiment is the same as the stator 1 according to the first embodiment.

[0083] As shown in FIG. 11 , the stator 4 includes a stator body 410 , a winding 20 , and an insulator 30 .

[0084] The stator body 410 has a stator core 40 and a magnetic flux take-in member 460. The magnetic flux take-in member 460 has a plurality of magnetic bodies 465 stacked in the z-axis direction. This makes it possible to reduce eddy current loss in the magnetic flux take-in member 460 compared to a configuration in which the magnetic flux take-in member 460 is formed from a single magnetic body.

[0085] Effect of Fourth Embodiment According to the fourth embodiment described above, magnetic flux take-in member 460 has a plurality of magnetic bodies 465 stacked in the z-axis direction, which makes it possible to reduce eddy current loss in magnetic flux take-in member 460 compared to a configuration in which magnetic flux take-in member 460 is formed from a single magnetic body.

[0086] <<Modification of Embodiment 4>> Figure 12 is a cross-sectional view that schematically shows a portion of the configuration of a stator 4A according to a modification of embodiment 4. In Figure 12, components that are the same as or correspond to components shown in Figure 11 are assigned the same reference numerals as those shown in Figure 11. The stator 4A according to the modification of embodiment 4 differs from the stator 4 according to embodiment 4 in the stacking direction of the multiple magnetic bodies 465A. In all other respects, the stator 4A according to the modification of embodiment 4 is the same as the stator 4 according to embodiment 4. Therefore, in the following description, reference will be made to Figures 1 and 4.

[0087] As shown in FIG. 12, the stator 4A has a stator body 410A, a winding 20, and an insulator 30.

[0088] The stator body 410A includes a stator core 40 and a magnetic flux intake member 460A. The magnetic flux intake member 460A includes multiple magnetic bodies 465A. The multiple magnetic bodies 465A are stacked in a radial direction perpendicular to the axial direction (z-axis direction). In other words, in the example shown in FIG. 12 , the stacking direction of the multiple magnetic bodies 465A is perpendicular to the stacking direction of the electromagnetic steel sheets 45 (see FIG. 4 ) of the stator core 40. This makes it easier for the magnetic flux of the permanent magnets 52 (see FIG. 1 ) captured in the multiple magnetic bodies 465A to flow toward the stator core 40. Furthermore, in the example shown in FIG. 12 , compared to a configuration in which multiple magnetic bodies 465A are stacked in the z-axis direction (see FIG. 11 ), magnetic flux loss caused by the magnetic flux of the permanent magnets 52 passing between adjacent magnetic bodies 465A can be reduced.

[0089] Effect of the Modification of the Fourth Embodiment According to the modification of the fourth embodiment described above, the multiple magnetic bodies 465A are stacked in the radial direction, which is a direction perpendicular to the axial direction. This makes it easier for the magnetic flux of the permanent magnets 52 taken in from the rotor 5 to flow toward the stator core 40. Furthermore, it is possible to suppress magnetic flux loss when the magnetic flux of the permanent magnets 52 passes between adjacent magnetic bodies 465A.

[0090] Fifth Embodiment Next, a blower 500 according to a fifth embodiment will be described. Fig. 13 is a partial cross-sectional view that schematically shows the configuration of blower 500 according to the fifth embodiment. As shown in Fig. 13, blower 500 has electric motor 100 and impeller (also called "blades" or "fan") 501. Impeller 501 generates an airflow by being driven by electric motor 100.

[0091] The rotor 5 has a shaft 51, a permanent magnet 52, a first bearing 53, and a second bearing 54. In the example shown in Fig. 13, the shaft 51 protrudes from the stator 1 toward the +z-axis side. In the following description, the protruding side of the shaft 51 (i.e., the +z-axis side) will be referred to as the "load side," and the opposite side of the shaft 51 to the load side (i.e., the -z-axis side) will be referred to as the "anti-load side."

[0092] The first bearing 53 is a bearing that supports the load side of the shaft 51. The first bearing 53 is held by a metal bracket 6. The second bearing 54 is a bearing that supports the anti-load side of the shaft 51. The second bearing 54 is held by a bearing holder 72 (described later) that is provided on the stator 1. The first bearing 53 and the second bearing 54 are each a rolling bearing.

[0093] If the first bearing 53 and the second bearing 54 are plain bearings, a gap will be generated between the plain bearings and the outer peripheral surface of the shaft 51. Therefore, while the electric motor 100 is rotating, the shaft 51 is likely to move radially, and the air gap between the permanent magnet 52 and the stator 1 is likely to change. Therefore, if the first bearing 53 and the second bearing 54 are plain bearings, the size of the air gap between the permanent magnet 52 and the stator 1 will likely become unbalanced in the axial direction when the electric motor 100 is rotating, and vibration of the magnetic flux intake members 61, 62 will be more likely to occur.

[0094] In the fifth embodiment, the first bearing 53 and the second bearing 54 are rolling bearings. In this case, the first bearing 53 and the second bearing 54 have an inner ring press-fitted onto the shaft 51, an outer ring fixed to a bearing holder, and rolling elements disposed between the inner ring and the outer ring. This makes it difficult for the shaft 51 to move radially while the electric motor 100 is rotating. Therefore, the air gap between the permanent magnet 52 and the stator 1 is unlikely to change.

[0095] The stator 1 includes a stator body 10 , a winding 20 , an insulator 30 , and a molded resin portion 70 .

[0096] The molded resin part 70 has an opening 71, a bearing holding part 72, and a fixing part 73. A metal bracket 6 that supports the first bearing 53 on the load side is fixed to the opening 71. The metal bracket 6 is fixed to the opening 71 by, for example, press fitting.

[0097] The bearing holding portion 72 is a recess in the molded resin portion 70 that holds the second bearing 54. A circuit board 8 is embedded in the molded resin portion 70 in a portion on the -z-axis side of the bearing holding portion 72. A power supply lead wire (not shown) for supplying power to the winding 20 is connected to the circuit board 8. The circuit board 8 is fixed to the insulator 30 via a winding terminal 7 connected to the winding 20. The fixing portion 73 is a portion of the electric motor 100 that is attached to a support portion of an object to be attached (e.g., a motor support portion provided in an outdoor unit). The fixing portion 73 extends radially outward from the end of the molded resin portion 70 on the anti-load side. The fixing portion 73 has an insertion hole 73a through which a fastening member (e.g., a bolt) is inserted.

[0098] In Fig. 13, when the length of the permanent magnet 52 in the z-axis direction is L2 and the bearing pitch, which is the distance between the center of the first bearing 53 and the center of the second bearing 54, is L3, the bearing pitch L3 may be longer than the length L2. Note that the bearing pitch L3 may be the same as the length L2. In other words, the bearing pitch L3 and the length L2 only need to satisfy the following formula (2): L3 ≥ L2 (2)

[0099] If the bearing pitch L3 between the first bearing 53 and the second bearing 54 is shorter than the length L2, the force acting on the load-side first bearing 53 during rotation of the electric motor 100 will be greater, making the first bearing 53 more susceptible to wear. Bearing wear here refers to wear on the inner and outer rings of the first bearing 53. When wear occurs on the inner and outer rings, the gap between the inner and outer rings will increase. This makes it easier for at least one of the load-side and anti-load-side portions of the shaft 51 to move radially during rotation. Therefore, a magnetic imbalance occurs between the magnetic flux flowing from the rotor 5 to the magnetic flux take-in member 61 on the +z-axis side and the magnetic flux flowing from the rotor 5 to the magnetic flux take-in member 62 on the −z-axis side, and this magnetic imbalance may cause vibration.

[0100] 13 is attached to the load side of the shaft 51, vibrations and noise are generated due to bending of the shaft 51 during rotation. If the vibration component due to the bending of the shaft 51 resonates with the vibration component due to the magnetic imbalance described above, there is a concern that even louder noise may be generated.

[0101] Furthermore, in the fifth embodiment, in order to ensure a sufficient air volume, the outer diameter D2 of the blade portion of the impeller 501 attached to the tip 51a of the shaft 51 is larger than the outer diameter D1 of the stator core 40. In this case, the inertia of the impeller 501 is large, so the protruding portion of the shaft 51 is likely to twist. There is also concern about vibrations caused by bending of the shaft 51 due to the weights of the shaft 51 and the impeller 501. If vibration components caused by such twisting and bending of the shaft 51 resonate with vibration components caused by the magnetic force of the permanent magnet 52, etc., as described above, the electric motor 100 will generate loud noise.

[0102] In the fifth embodiment, as shown in the above-described formula (2), the bearing pitch L3 between the first bearing 53 on the load side and the second bearing 54 on the counter-load side is equal to or greater than the length L2 of the permanent magnet 52 in the z-axis direction. This reduces the force acting on the first bearing 53 and the second bearing 54 during rotation of the electric motor 100. This reduces wear on the first bearing 53 and the second bearing 54, making it difficult for the shaft 51 to move radially during rotation of the electric motor 100. This reduces the magnetic imbalance between the magnetic flux flowing from the rotor 5 to the magnetic flux take-in member 61 on the +z-axis side and the magnetic flux flowing from the rotor 5 to the magnetic flux take-in member 62 on the -z-axis side, thereby suppressing vibrations due to this magnetic imbalance. Therefore, even when an impeller 501 with a large outer diameter D2 of the blades is attached to the electric motor 100, noise generation can be suppressed.

[0103] Effect of Embodiment 5 According to the above-described embodiment 5, blower 500 includes electric motor 100 according to embodiment 1. As described above, electric motor 100 according to embodiment 1 prevents contact between magnetic flux intake members 61, 62 and rotor 5, thereby improving quietness. Therefore, by including electric motor 100 in blower 500, the quietness of blower 500 can be improved.

[0104] Furthermore, according to the fifth embodiment, the bearing pitch L3 between the first bearing 53 on the load side and the second bearing 54 on the counter-load side is equal to or greater than the length L2 of the permanent magnet 52 in the z-axis direction. This reduces the force acting on the first bearing 53 and the second bearing 54 during rotation of the electric motor 100, making it difficult for the shaft 51 to move radially. This reduces the magnetic imbalance between the magnetic flux flowing from the rotor 5 to the magnetic flux take-in member 61 on the +z-axis side and the magnetic flux flowing from the rotor 5 to the magnetic flux take-in member 62 on the -z-axis side, thereby suppressing vibrations due to this magnetic imbalance. Therefore, even when an impeller 501 with a large outer diameter D2 of the blades is attached to the electric motor 100, noise generation can be suppressed.

[0105] DESCRIPTION OF SYMBOLS 1 to 4, 1A, 1B, 2A, 4A Stator, 5 Rotor, 10, 310, 410, 410A Stator body, 20 Winding, 21 Protrusion, 30, 230 Insulator (first insulating member), 30e End, 31, 60c Radially outward surface, 31a First inclined portion, 32, 60d Radially inward surface, 32a Second inclined portion, 33 First portion, 34 Second portion, 40 Stator core, 42 Teeth, 42a Teeth body portion, 42b Teeth tip portion, 42c, 42d End face (end portion), 45 Electromagnetic steel plate, 51 Shaft, 52 Permanent magnet, 53, 54 Bearing, 60, 60A, 61, 62, 460, 460A magnetic flux intake member, 80 molded resin portion (second insulating member), 100, 300 electric motor, 465, 465A magnetic body, 500 blower, 501 impeller, d gap, F １ , F ２ , F １１ , F １２ , F １３ Winding stress, H１ , H ２ Height, L1, L2 Length, L3 Bearing pitch, P3, P5 Center position, S Plane, t1, t2 Thickness.

Claims

1. A stator that constitutes an electric motor together with a rotor, a stator body having a stator core and a magnetic flux intake member provided at an axial end of the stator core; A winding wound on the stator core; a first insulating member for insulating the stator body from the winding; having the axial length of the stator core is shorter than the axial length of the permanent magnet of the rotor, the magnetic flux intake member faces the permanent magnet and takes in magnetic flux from the permanent magnet; the first insulating member has a first portion provided between the magnetic flux intake member and the winding; The thickness of the first portion in the radial direction of the stator core becomes thinner toward the end of the first insulating member in the axial direction. stator.

2. the first insulating member further includes a second portion provided between the stator core and the winding, The first portion has a thickness in the radial direction that is smaller than a thickness in the radial direction of the second portion. The stator according to claim 1 .

3. a surface of the first insulating member facing the winding is located between the magnetic flux take-in member and the winding in the radial direction; the surface of the first insulating member facing the winding has a first inclined portion; The first inclined portion is inclined such that the position in the radial direction approaches the magnetic flux capture member as the first inclined portion approaches the end portion in the axial direction of the first insulating member.

3. A stator according to claim 1 or 2.

4. A gap is provided between the first inclined portion and the winding. The stator according to claim 3.

5. a surface of the first insulating member facing the magnetic flux take-in member is located between the magnetic flux take-in member and the winding in the radial direction; the surface of the first insulating member facing the magnetic flux capture member has a second inclined portion; The second inclined portion is inclined such that the position in the radial direction approaches the winding as the second inclined portion approaches the end portion in the axial direction of the first insulating member.

3. A stator according to claim 1 or 2.

6. The surface of the magnetic flux intake member facing the first insulating member is in contact with the second inclined portion. The stator according to claim 5.

7. the winding has a protruding portion covering an end surface of the first insulating member in the axial direction, The height of the protrusion in the axial direction from the end face is lower at an inner portion in the radial direction than at a center of the protrusion in the radial direction.

3. A stator according to claim 1 or 2.

8. The stator further includes a second insulating member that fixes the first insulating member to the stator body.

3. A stator according to claim 1 or 2.

9. The second insulating member fixes the winding to the stator core. The stator according to claim 8.

10. The magnetic flux intake member includes a plurality of magnetic bodies.

3. A stator according to claim 1 or 2.

11. The stator core has a plurality of electromagnetic steel plates laminated in the axial direction, The plurality of magnetic bodies are stacked in the radial direction. The stator according to claim 10.

12. The stator according to claim 1 or 2; the rotor disposed radially inward of the stator; have Electric motor.

13. the rotor has a rotating shaft and a rotor body supported by the rotating shaft and including the permanent magnet, A first length which is the axial length of the stator core is shorter than a second length which is the axial length of the rotor body.

13. The electric motor according to claim 12.

14. The rotor further includes a first bearing supporting a load side of the rotating shaft and a second bearing supporting a non-load side of the rotating shaft, A distance between the first bearing and the second bearing in the axial direction is equal to or greater than the second length.

14. The electric motor according to claim 13.

15. The stator core has a yoke and teeth, A surface of the magnetic flux intake member facing the rotor is located closer to the winding than a plane including the radially inward surfaces of the teeth.

13. The electric motor according to claim 12.

16. The magnetic flux intake member is disposed only at one end of the stator core in the axial direction.

13. The electric motor according to claim 12.

17. A portion of the radially inward surface of the first insulating member opposite to a portion facing the magnetic flux intake member in the radial direction is located radially outward of the radially inward surface of the stator core.

17. The electric motor of claim 16.

18. The axial center position of the rotor is shifted toward the magnetic flux intake member with respect to the axial center position of the stator.

17. The electric motor of claim 16.

19. The electric motor according to claim 12; an impeller driven by the electric motor; have Blower.

20. The outer diameter of the impeller is larger than the outer diameter of the stator core.

20. The blower of claim 19.