Stator and electric motor

Abstract

A stator according to the present disclosure is provided on an electric motor and comprises: a coil section formed in a ring shape to surround a rotor provided on the electric motor, and having a coil end; and a heat-shrink tube covering the coil end without covering the inner circumference of the coil end. A lead wire of the coil section extends from the radially inner side of the coil section.

Description

Technical field

[0001] The present disclosure relates to a stator and an electric motor. State of the art

[0002] JP S50-124102 A discloses a stator provided in an electric motor. The stator comprises a coil section with a coil end and a plurality of protective insulating elements (adhesive strips). The plurality of protective insulating elements are laminated onto the surface of the coil end. Summary of the invention

[0003] The structure disclosed in JP S50-124102 A is not necessarily advantageous for the miniaturization of the electric motor.

[0004] A first aspect of the present disclosure is a stator provided in an electric motor, comprising: a coil section formed in a ring shape to surround a rotor provided in the electric motor, the coil section having a coil end; and a shrink sleeve covering the coil end without covering an inner circumferential section of the coil end, with a lead-out wire of the coil section being brought out from a radially inner side of the coil section.

[0005] A second aspect of the present disclosure is an electric motor comprising the stator. Brief description of the drawings [ Fig. 1] Fig. 1 is an exploded view of an electric motor according to a first embodiment of the present invention; [ Fig. 2] Fig. Figure 2 is an exploded view showing a housing element and a coil former; [ Fig. 3] Fig. 3 is a top view of a stator; [ Fig. 4] Fig. Figure 4 is a cross-sectional view showing part of the stator; [ Fig. 5] Fig. 5 is a top view of a stator according to a second embodiment of the present invention; [ Fig. 6] Fig. Figure 6 is a cross-sectional view showing part of the stator; [ Fig. 7] Fig. Figure 7 is a top view of a stator according to a first modification; and [ Fig. 8] Fig. Figure 8 is a cross-sectional view showing part of the stator. Detailed description of the invention

[0006] Conventional techniques, including JP S50-124102 A, exhibit at least the following problems. Specifically, laminating multiple cover elements onto the coil end surface increases the size of the stator end section in the axial direction. This enlargement of the stator is not advantageous when miniaturizing the electric motor.

[0007] To achieve miniaturization of the electric motor, one possible countermeasure is to reduce the amount of conductive wire in the coil section, thereby making the coil end itself relatively small. Accordingly, even if it is unfavorably enlarged as described above, it is conceivable that the end section of the stator could be made relatively small in the axial direction. However, the problem arises that the power output of the electric motor is reduced due to the decrease in the amount of conductive wire in the coil section.

[0008] Based on the preliminary description above, a first embodiment is described below. (First embodiment)

[0009] Fig. Figure 1 is an exploded view of an electric motor 10 according to a first embodiment of the present invention.

[0010] As in Fig. As shown in Figure 1, the electric motor 10 comprises a rotating shaft 12, a rotor 14, and a stator 16 (161). The axial direction DA, which is the extension direction of the rotating shaft 12, comprises a first direction DA1 and a second direction DA2, which is the opposite direction to the first direction DA1.

[0011] The rotating shaft 12 is attached to the rotor 14. The stator 161 is cylindrical in shape to surround the rotor 14. The rotor 14 and the rotating shaft 12 are rotatably mounted inside the stator 161.

[0012] The stator 161 comprises a housing element 18, a coil former 20, a coil section 22, and a pair of heat shrink tubes 24. A in Fig. The lead-out wire 26 shown in Figure 1 is led out of the coil section 22.

[0013] The housing element 18 is a cylindrical element that can surround the rotor 14. The housing element 18 extends along the axial direction DA. The housing element 18 has end sections 18t (18t1, 18t2) in the axial direction DA. The end sections 18t comprise a first end section 18t1 in the first direction DA1 and a second end section 18t2 in the second direction DA2.

[0014] The housing element 18 (181) can be a magnetic body made of electrical steel or the like, or it can be an insulator made of resin or the like. In the present embodiment, a case is described in which the housing element 181 is a magnetic body. The housing element 181 comprises, for example, a plurality of electrical steel sheets (not shown) stacked along the axial direction DA, but is not limited to this. Preferably, an insulating layer 28 is provided on the inside (the inner wall 181i) of the housing element 181 (see also Fig. 2 to 4).

[0015] Fig. Figure 2 is an exploded view showing the housing element 181 and the coil former 20.

[0016] The coil former 20 is an element that supports the coil section 22 (see also Fig. 1) The coil former 20 has an insulating property. The coil former 20 is provided inside the housing element 181. More precisely, the coil former 20 is provided inside the housing element 181, which has the insulating layer 28 formed on the inner wall 181i. As shown in Fig. As shown in Figure 2, the coil former 20 comprises a coil former core 30 and a plurality of partitions 32.

[0017] The coil former 30 is a tubular element. The coil former 30 extends along the axial direction DA. The rotor 14 and the rotating shaft 12 are located inside the coil former 30.

[0018] The maximum dimension L30 of the coil former 30 in the axial direction DA is longer than the dimension L181 of the housing element 181 in the axial direction DA (L30 > L181). Therefore, the coil former 30 protrudes from the housing element 181 (see also Fig. 1) More precisely, the coil former 30 has a projecting wall section 34 that extends from the housing element 181. The projecting wall section 34 can be formed in an annular (tubular) shape over the entire circumference of the coil former 30. The projecting wall section 34 comprises a first projecting wall section 341 in the first direction DA1 and a second projecting wall section 342 in the second direction DA2. As shown in Fig. As shown in Figure 1, the first projecting wall section 341 extends beyond the first end section 18t1 of the housing element 181 in the first direction DA1. The second projecting wall section 342 extends beyond the second end section 18t2 of the housing element 181 in the second direction DA2. One of the first projecting wall section 341 and the second projecting wall section 342 can be omitted.

[0019] As in Fig. As shown in Figure 2, each of the partition walls 32 extends along the axial direction DA. For example, the dimension L32 of the partition wall 32 in the axial direction DA is essentially equal to the dimension L181 of the housing element 181 in the axial direction DA (L32 ≈ L181), but this is not the only possible difference. That is, the difference between dimension L32 and dimension L181 can lie within a predetermined range. Dimension L32 and dimension L181 can be the same or they can differ from each other within the range described above.

[0020] Fig. Figure 3 is a top view of stator 161. A top view of stator 161 viewed in the axial direction is shown in Fig. 3 shown.

[0021] As in Fig. As shown in Figure 3, the majority of partitions 32 (321, 322, ..., 326) project from the outer circumferential wall 30p of the coil former 30 towards the outside in the radial direction DR (i.e., in the radially outward direction) of the coil former 30 (coil section 22). When viewed in the axial direction, the majority of partitions 32 are arranged at intervals along the circumferential direction DC of the coil former 30 (coil section 22). For example, the majority of partitions 32 can be arranged point-symmetrically with respect to a center point C of the stator 161 as an axis of symmetry when viewed in the axial direction. The number of partitions 32 that can be provided in the coil former 20 is not limited to six.

[0022] The coil section 22, viewed in the axial direction, has a ring shape that can surround the rotor 14 and the rotating shaft 12. The coil section 22 is formed by conductive wires wound around the plurality of partitions 32. An insulating material (not shown) is filled in the gaps between the conductive wires forming the coil section 22. The insulating material is, for example, a hardened impregnating agent. The impregnating agent is, for example, a thermosetting impregnating agent such as a varnish.

[0023] The coil section 22 comprises a coil end 36. As described above, the shape of the coil section 22 is annular when viewed in the axial direction. Accordingly, the coil end 36 also has an annular shape when viewed in the axial direction. The annular coil end 36 has an outer circumferential section 36p, which lies outside in the radial direction DR, an inner circumferential section 36i, which lies inside in the radial direction DR, and a tip section 36t in the axial direction DA (see also Fig. 4).

[0024] Fig. Figure 4 is a cross-sectional view showing part of the stator 161. Fig. Figure 4 shows part of a cross-section along line IV-IV, which is in Fig. 3 is shown.

[0025] The coil end 36 (361, 362) comprises a first coil end 361 and a second coil end 362. The first coil end 361 projects beyond the first end section 18t1 of the housing element 181 in the first direction DA1. The second coil end 362 projects beyond the second end section 18t2 of the housing element 181 in the second direction DA2.

[0026] As in Fig. As shown in Figure 4, the dimension of the protruding wall section 34 in the axial direction DA is preferably equal to or greater than the dimension of a section of the coil end 36 that projects beyond the end section 18t in the axial direction DA.

[0027] More precisely, there is a dimension L341 and a dimension L361 in Fig. Figure 4 shows that dimension L341 is a length from the first end section 18t1 of the housing element 181 to the tip 341t of the first projecting wall section 341 in the axial direction DA. Dimension L361 is a length from the first end section 18t1 to the tip section 36t (361t) of the first coil end 361 in the axial direction DA. Dimension L341 is preferably equal to or greater than dimension L361 (L341 ≥ L361). As shown in Fig. As shown in Figure 4, dimension L341 is more preferably longer than dimension L361 (L341 > L361). However, dimension L341 can also be shorter than dimension L361.

[0028] The dimensions L342 and L362 are also in Fig. Figure 4 shows that dimension L342 is a dimension in the axial direction DA from the second end section 18t2 of the housing element 181 to the tip 342t of the second projecting wall section 342. Dimension L362 is a length in the axial direction DA from the second end section 18t2 to the tip section 36t (362t) of the second coil end 362. Dimension L342 is preferably equal to or greater than dimension L362 (L342 ≥ L362). As shown in Fig. As shown in Figure 4, dimension L342 is more preferably longer than dimension L362 (L342 > L362). However, dimension L342 can be shorter than dimension L362. Dimensions L341 and L342 can be the same or different.

[0029] Each of the two heat shrink tubes 24 is, for example, made of a tubular film material (resin material) with insulating and heat shrink properties. The pair of heat shrink tubes 24 is attached to the spool end 36 such that it covers the outer circumferential section 36p of the spool end 36 and the tip section 36t in the axial direction DA of the spool end 36. More precisely, the pair of heat shrink tubes 24 comprises a first heat shrink tube 241, which is attached to the first spool end 361, and a second heat shrink tube 242, which is attached to the second spool end 362.

[0030] The first heat shrink tube 241 covers the outer circumferential section 36p (361p) of the first coil end 361. The first heat shrink tube 241 preferably covers the entire outer circumferential section 361p. The first heat shrink tube 241 extends from the outer circumferential section 361p of the first coil end 361 towards the inner circumferential section 36i (361i) of the first coil end 361 and further covers at least a part of the tip section 361t of the first coil end 361. The first heat shrink tube 241 preferably covers the entirety of the tip section 361t, but is not limited to it.

[0031] The second heat shrink tube 242 covers the outer circumferential section 36p (362p) of the second coil end 362. The second heat shrink tube 242 preferably covers the entire outer circumferential section 362p. The second heat shrink tube 242 extends from the outer circumferential section 362p of the second coil end 362 towards the inner circumferential section 36i (362i) of the second coil end 362 and further covers at least a portion of the tip section 362t of the second coil end 362. The second heat shrink tube 242 preferably covers the entirety of the tip section 362t, but is not limited to it.

[0032] The inner circumferential section 36i of the coil end 36 is not covered by the heat shrink tubing 24. The lead-out wire 26 of the coil section 22 is brought out from a radially inner side (i.e., an inside in the radial direction DR) of the coil section 22 through a gap between the coil section 22 and the coil former 30. More precisely, the lead-out wire 26 is brought out from the inner circumferential section 36i of the coil end 36 through a gap between the coil section 22 and the coil former 30. The lead-out wire 26 is part of the conductive wire that forms the coil section 22. The coil section 22 can be connected via the lead-out wire 26 to a power supply (not shown) for supplying electrical current to the coil section 22.

[0033] According to the present embodiment, the stator 161 and the electric motor 10 comprising the stator 161 can, for example, have the following function and advantageous effects.

[0034] The outer circumferential section 36p and the tip section 36t (at least one section of the tip section 36t) of the coil end 36 are covered by the heat shrink tubing 24. The outer circumferential section 36p and the tip section 36t are sections that are more likely to come into contact with the housing element 181, which contains, for example, electrical steel, or external foreign material (dust, water, oil, etc.) than the inner circumferential section 36i. The outer circumferential section 36p and the tip section 36t are covered by the heat shrink tubing 24, so that the coil end 36 can advantageously be prevented from coming into contact with the housing element 181, foreign material, or the like. In the case where the entire outer circumferential section 36p is covered with the shrink tubing 24, the outer circumferential section 36p can be more advantageously prevented from coming into contact with foreign material or the like.In the case where the entire tip section 36t is covered with the shrink tubing 24, the tip section 36t can be advantageously prevented from coming into contact with foreign material or the like.

[0035] The shrunk heat shrink tubing 24 can securely fix the coil end 36. Therefore, the heat shrink tubing 24 prevents the coil end 36 from losing its shape, for example, due to its own weight. By preventing the coil end 36 from losing its shape, the coil end 36 and the housing element 181 can, for example, be more advantageously prevented from coming into contact with each other.

[0036] According to the present embodiment, the coil end 36 can be well protected by the shrink tubing 24, which has a minimal thickness. However, if the coil end 36 is covered with adhesive tape, the tape may detach from the coil end 36 if the end to which the tape is attached is heated during the manufacturing process of the stator 16. Therefore, the coil ends 36 cannot always be adequately protected solely by the adhesive tape. Furthermore, if fabric is wrapped around the end of the coil 36 to prevent the tape from detaching, the end section of the stator 16 is enlarged by the tape, fabric, and other materials present at the coil end 36.Consequently, the attempt to miniaturize the stator 16 while simultaneously preventing a reduction in the amount of conductive wire used in the coil section 22 is hindered, as is the attempt to miniaturize the electric motor 10 equipped with the stator 16 while simultaneously preventing a reduction in the power output of the electric motor 10. In contrast, according to the present embodiment, the heat-shrink tubing 24, which covers the coil end 36, can maintain close contact with the coil end 36 even when heated. Therefore, even a minimal thickness of heat-shrink tubing 24 can satisfactorily protect the coil end 36. Since the coil end 36 can be protected by the relatively thin heat-shrink tubing 24, it is possible to suppress an increase in the size of the stator 161 without reducing the amount of conductive wire used in the coil section 22.That is, the stator 161 according to the present embodiment is suitable for reducing the size of the electric motor 10 while suppressing a reduction in the power of the electric motor 10.

[0037] The inner circumferential section 36i of the coil end 36 is intentionally not covered with the heat shrink tubing 24, and the lead-out wire 26 is led out from the radially inner side (the inside in the radial direction DR) (i.e., the inner circumferential section 36i) of the coil section 22. This can reduce interference between the heat shrink tubing 24 and the lead-out wire 26.

[0038] The lead-out wire 26 is led out from the radially inner side (the inside in the radial direction DR) (i.e., the inner circumferential section 36i) of the coil section 22. Therefore, it is not necessary, for example, to form a hole in the heat shrink tubing 24 to allow the lead-out wire 26 to lead out from the outer circumferential section 36p of the coil end 36. This ensures that the entire outer circumferential section 36p is covered by the heat shrink tubing 24.

[0039] The coil former 30 is provided with a projecting wall section 34, which is arranged between the coil end 36 (coil section 22) and the rotating shaft 12, the rotor 14, etc. The projecting wall section 34 comprises at least one of the first projecting wall section 341, which extends from the housing element 181 in the first direction DA1, or the second projecting wall section 342, which extends from the housing element 181 in the second direction DA2. This reduces the possibility of contact between the coil end 36 (coil section 22) and the rotating shaft 12, the rotor 14, and the like. The dimension of the projecting wall section 34 of the coil body core 30 in the axial direction DA is preferably equal to or greater than the dimension of a section of the coil end 36 that projects beyond the end section 18t of the housing element 181 in the axial direction DA (L341 ≥ L361; L342 ≥ L362).Thus, the coil section 22 is separated from the rotating shaft 12, the rotor 14, and the like by the coil core 30, which includes the projecting wall section 34. The dimension L341 of the first projecting wall section 341 and the dimension L342 of the second projecting wall section 342 can be the same or different from each other. That is, the stator 161 can accommodate a design change with respect to the dimensions L341 and L342, which is appropriately implemented to a certain extent depending on the convenience of the stator 161 manufacturer.

[0040] The dimension of the projecting wall section 34 of the coil core 30 in the axial direction DA is preferably longer than the dimension of a section of the coil end 36 that projects beyond the end section 18t of the housing element 181 in the axial direction DA (L341 > L361; L342 > L362). This further reduces the possibility of contact between the coil end 36 (coil section 22) and the rotating shaft 12, the rotor 14, and the like.

[0041] The projecting wall section 34 extends over the entire circumference of the coil former core 30. Thus, the coil former core 30, including the projecting wall section 34, more reliably separates the coil section 22 from the rotating shaft 12, the rotor 14, and the like. Therefore, it is possible to further reduce the risk of contact between the coil end 36 (coil section 22) and the rotating shaft 12, the rotor 14, and the like.

[0042] The housing element 181 is made of electrical steel. This makes it possible to reduce iron loss that occurs in the electric motor 10. Additionally, a material from a general stator core (such as an electrical steel sheet) can also be used for the housing element 181, which is made of electrical steel. This can, for example, limit cost increases in the material procurement of the housing element 181.

[0043] The insulating layer 28 is formed on the inner wall 181i of the housing element 181, which is made of an alloy (electrical steel). This prevents the housing element 181 and the coil section 22 from being short-circuited. If the housing element 181 is made of an insulating material such as resin, the housing element 181 and the coil section 22 can be prevented from being short-circuited without the insulating layer 28 mentioned above.

[0044] The heat shrink tubing 24 exhibits heat shrink properties. Therefore, the heat shrink tubing 24 is easily shrunk by heating. In this case, for example, a retaining element to prevent the adhesive tape applied to the coil end from lifting or detaching is not required. Therefore, the method for manufacturing the stator 161 is simple compared to the conventional technique disclosed, for example, in JP S50-124102 A.

[0045] The electric motor 10, which includes the stator 161, can be realized in a relatively small size while reducing power consumption. (Second embodiment)

[0046] A second embodiment of the present invention is described below. In the second embodiment, any description that overlaps with the first embodiment is optionally omitted. In the drawings used in the second embodiment, the same components as those described in the first embodiment are designated with the same reference numerals.

[0047] Fig. Figure 5 is a top view of a stator 16 (162) according to the second embodiment. A top view of the stator 162 viewed in the axial direction is shown in Fig. 5 shown. Fig. Figure 6 is a cross-sectional view showing part of the stator 162. Fig. Figure 6 shows part of a cross-section along line VI-VI, which is in Fig. 5 is shown.

[0048] The stator 162 comprises the housing element 18 (182), the coil section 22, and the heat-shrink tubing 24. The housing element 182 has a tubular shape. The rotating shaft 12 and the rotor 14, which are provided in the electric motor 10, can be located inside the housing element 182.

[0049] The housing element 182 is a stator core (magnetic body) containing electrical steel or the like. The housing element 182 comprises, for example, a plurality of electrical steel sheets (not shown) stacked along the axial direction DA, but is not limited to this.

[0050] The housing element 182 comprises a tooth section 38. The tooth section 38 comprises a plurality of teeth 40. Although six teeth 40 in Fig. As shown in Figure 5, the number of teeth 40 is not limited. The majority of teeth 40 are arranged such that they surround the rotor 14 when viewed in the axial direction. For example, the majority of teeth 40 can be arranged point-symmetrically with respect to a center point C of the stator 162 as an axis of symmetry when viewed in the axial direction.

[0051] A slot 42 is formed between the teeth 40, which are adjacent to each other in the circumferential direction DC of the housing element 182 (coil section 22). In other words, the housing element 182 has a plurality of slots 42 formed by the tooth section 38. Although not shown, an insulating layer is provided on the surface of the slot 42.

[0052] The coil section 22 is formed by conductive wires wound around the majority of teeth 40. As in Fig. As shown in Figure 6, part of the coil section 22 (conductive wires) is located in the plurality of slots 42. An insulating material (not shown) is filled in the gaps between the conductive wires forming the coil section 22. The insulating material is, for example, a hardened impregnating agent.

[0053] As in Fig. As shown in Figure 6, the coil end 36 of the coil section 22 projects from the housing element 182 in the axial direction DA. The coil end 36 comprises a first coil end 361 in the first direction DA1 and a second coil end 362 in the second direction DA2.

[0054] A pair of heat shrink tubes 24, including a first heat shrink tube 241 and a second heat shrink tube 242, is provided in the stator 162. The first heat shrink tube 241 covers the outer circumferential section 361p of the first coil end 361 and the tip section 361t in the first direction DA1 of the first coil end 361. The second heat shrink tube 242 covers the outer circumferential section 362p of the second coil end 362 and the tip section 362t in the second direction DA2 of the second coil end 362. Each of the two heat shrink tubes 24 exhibits, for example, insulating and heat shrink properties.

[0055] The inner circumferential section 36i of the coil end 36 is not covered with the heat shrink tubing 24. The lead-out wire 26 of the coil section 22 is led out from the radially inner side (the inside in the radial direction DR) (i.e., the inner circumferential section 36i) of the coil section 22.

[0056] The stator 16 can be contained in the electric motor 10 (see also Fig. 1) The stator 162 and the electric motor 10 comprising the stator can, for example, have the following function and advantageous effects.

[0057] The outer circumferential section 36p and the tip section 36t (at least a portion of the tip section 36t) of the coil end 36 are covered by the heat shrink tubing 24. Thus, as in the first embodiment, the coil end 36 can advantageously be prevented from coming into contact with the housing element 182, foreign material, or the like. In the case where the entire outer circumferential section 36p is covered with the heat shrink tubing 24, the outer circumferential section 36p can be more advantageously prevented from coming into contact with foreign material or the like. In the case where the entire tip section 36t is covered with the heat shrink tubing 24, the tip section 36t can be more advantageously prevented from coming into contact with foreign material or the like. The shrunk heat shrink tubing 24 can securely fix the coil end 36.Since the coil end 36 can further be protected by the shrink tubing 24, which is a relatively thin element, it is possible to suppress an increase in the size of the stator 162 without reducing the amount of conductive wire used in the coil section 22.

[0058] The inner circumferential section 36i of the coil end 36 is intentionally not covered by the heat shrink tubing 24, and the exit wire 26 is led out from the radially inner side (the inside in the radial direction DR) (i.e., the inner circumferential section 36i) of the coil section 22. Thus, as in the first embodiment, interference between the heat shrink tubing 24 and the exit wire 26 can be suppressed. Additionally, it is not necessary to form a hole in the heat shrink tubing 24 to allow the exit wire 26 to be led out from the outer circumferential section 36p of the coil end 36. This ensures that the entire outer circumferential section 36p is covered by the heat shrink tubing 24.

[0059] The housing element 182 is a tubular stator core containing an alloy such as electrical steel. This makes it possible to reduce iron loss that occurs in the electric motor 10. Additionally, a material from a general stator core (such as electrical steel sheet) can also be used for the housing element 182, which is made of electrical steel. This can, for example, limit cost increases in the material procurement of the housing element 182.

[0060] The housing element (stator core) 182 comprises the toothed section 38. The coil section 22 is provided on the toothed section 38. In this case, the coil former 20 (see the first embodiment) is not required.

[0061] An insulating layer (not shown) is provided on the surface of the slot 42. This can reduce the possibility of a short circuit between the coil section 22 and the housing element 182.

[0062] The heat shrink tubing 24 exhibits heat shrink properties. Therefore, the heat shrink tubing 24 is easily shrunk, for example, by heating it. In this case, for example, a retaining element to prevent the adhesive tape applied to the coil end from lifting or detaching is not required. Therefore, the method for manufacturing the stator 162 is simple compared to the conventional technique disclosed, for example, in JP S50-124102 A.

[0063] The electric motor 10, which includes the stator 162, can be realized in a relatively small size while reducing power consumption.

[0064] The above embodiments can be modified as follows. In the following modifications, the description that overlaps with the embodiments is omitted. In the drawings used to illustrate the following modifications, the same components as those described in the embodiment are designated with the same reference numerals. (Variation 1)

[0065] Fig. Figure 7 is a top view of a stator 16 (16A) according to a first modification. A top view of the stator 16A viewed in the axial direction is shown in Fig. 7 shown. Fig. Figure 8 is a cross-sectional view showing part of the stator 16A. Fig. Figure 8 shows part of a cross-section along line VIII-VIII, which is in Fig. 7 is shown.

[0066] In a modification of the first embodiment, the projecting wall section 34 of the coil former 20 can be formed only on a portion of the coil former core 30 in the circumferential direction DC. This can reduce the material consumption of the coil former 20. For example, a coil former core 30 (coil former core 30A) with a projecting wall section 34 (projecting wall section 34A) according to the present modification in Fig. 7 and Fig. Figure 8 shows that the projecting wall section 34A extends axially (DA) from a portion of the coil core 30A in the circumferential direction (DC). More precisely, the section shown in Figure 8 extends axially (DA) from a portion of the coil core 30A in the circumferential direction (DC). Fig. 7 and Fig. 8 shown projecting wall section 34A in the first direction DA1 from a section of the coil body core 30A, which is located between the partition 322 and the partition 323 in the circumferential direction DC.

[0067] In this case, the lead-out wire 26 is preferably led out at a section corresponding to the protruding wall section 34. That is, the coil section 22 has a lead-out section 44, which is a section from which the lead-out wire 26 leads out. The position of the lead-out section 44 in the circumferential direction DC preferably corresponds to the position of the protruding wall section 34A in the circumferential direction DC. For example, as in Fig. Figure 7 shows the exit section 44 contained within a section of the coil section 22 located between the partition 322 and the partition 323 in the circumferential DC direction. As described above, the position of the exit section 44 and the position of the protruding wall section 34A preferably overlap in the circumferential DC direction. By overlapping the position of the exit section 44 and the position of the protruding wall section 34A in the circumferential DC direction, the possibility of contact between the rotating shaft 12, the rotor 14, and the like, and the exit wire 26 can be reduced. (Variation 2)

[0068] Although not specifically shown, coil section 22 can comprise a plurality of coils. The plurality of coils includes, for example, a coil for use as a U-phase coil, a coil for use as a V-phase coil, and a coil for use as a W-phase coil.

[0069] If a plurality of coils are contained in coil section 22, the coil end 36 can be formed by the plurality of coils. In other words, the plurality of coils contained in coil section 22 can form an annular first coil end 361 as a whole. The plurality of coils contained in coil section 22 can form an annular second coil end 362 as a whole. Accordingly, the number of shrink tubes 24 provided in the stator 16 can be two, regardless of the number of coils contained in coil section 22.

[0070] The coil section 22, which comprises a plurality of coils, can have a plurality of lead-out wires 26 corresponding to the number of coils. For example, the coil section 22 can include a lead-out wire 26 leading out of the U-phase coil, a lead-out wire 26 leading out of the V-phase coil, and a lead-out wire 26 leading out of the W-phase coil.

[0071] With respect to the first modification, the coil former 20 can have a plurality of projecting wall sections 34A corresponding to the plurality of lead wires 26 (the plurality of lead sections 44). For example, the lead section 44 of the U-phase coil, the lead section 44 of the V-phase coil, and the lead section 44 of the W-phase coil can differ from one another in the circumferential DC direction of the coil former core 30A. In this case, the coil former 20 can have a projecting wall section 34A corresponding to the lead section 44 of the U-phase coil, a projecting wall section 34A corresponding to the lead section 44 of the V-phase coil, and a projecting wall section 34A corresponding to the lead section 44 of the W-phase coil.

[0072] If the coil section 22 comprises a plurality of exit sections 44, the positions of the plurality of exit sections 44 and the position of a projecting wall section 34A in the circumferential direction DC can overlap. That is, the plurality of exit wires 26 can be routed out at a section corresponding to the one projecting wall section 34A. For example, the plurality of exit wires 26 can be routed out from a position between the partition 322 and the partition 323 in the circumferential direction DC in the coil section 22 (see also Fig. 7) In this case, not only is the possibility of contact between the rotating shaft 12, the rotor 14 and the like and the plurality of outgoing wires 26 reduced, but also the number of protruding wall sections 34A can be minimized (i.e. one). (Variation 3)

[0073] As described above, the insulating layer 28 is provided on the inner wall 181i of the housing element 181. As described above, the insulating material (not shown) is filled in the gaps between the conductive wires forming the coil section 22. The insulating material and the insulating layer 28 can be made of the same material (impregnating agent). This can reduce the number of materials required. (Variation 4)

[0074] As described above, the coil section 22, the rotor 14, and the like are located within the space inside the tubular housing element 18. In this respect, the electric motor 10 may further include a housing (not shown) that covers the space inside the housing element 18 as needed. This can prevent foreign material present outside the electric motor 10 from penetrating the interior of the housing element 18. This foreign material includes, but is not limited to, dust, water, oil, or the like.

[0075] For example, the electric motor 10 can include a housing that can cover the entire stator 16. Furthermore, the housing element 18 has, for example, the first end section 18t1 and the second end section 18t2, as described above (see also Fig. 1 and Fig.6) The electric motor 10 can comprise a first housing attached to the first end section 18t1 and a second housing attached to the second end section 18t2. In this case, the first and second housings clamp the housing element 18 in the axial direction DA. At least one of the first housings or the second housing can include one or more holes through which the rotating shaft 12, the lead wire 26, and the like are inserted. (Variation 5)

[0076] The shape of the housing element 18 or the coil former core 30 is not limited to a cylinder and can be a rectangular tube. The shape of the coil section 22 (coil end 36), viewed in the axial direction, is not limited to a circular ring shape and can, for example, have a square section. (Combination of variations)

[0077] The majority of the variations described above can be appropriately combined within a range where no technical inconsistencies occur.

[0078] According to the embodiments and the modifications described above, the stator 16 is suitable for reducing the size of the electric motor 10 while suppressing a reduction in the power of the electric motor 10.

[0079] The following additional remarks are disclosed with regard to the above embodiments. (Supplementary Note 1)

[0080] The stator (16) according to the present disclosure is a stator provided in the electric motor (10), wherein the stator comprises the coil section (22) which is formed in a ring shape to surround the rotor (14) provided in the electric motor, the coil section comprising the coil end (36); and the shrink tubing (24) which covers the coil end without covering the inner circumferential section (36i) of the coil end, wherein the lead-out wire (26) of the coil section is led out from the radially inner side (the inside in the radial direction (DR)) of the coil section. (Supplementary Note 2)

[0081] The stator according to Supplementary Note 1 may further comprise the coil former (20) which supports the coil section, wherein the coil former may comprise: the coil former core (30) having a tubular shape and extending in the axial direction (DA); and the plurality of partitions (32) projecting from the coil former core in the radially outward direction of the coil former core, wherein the coil section may be formed by the conductive wire wound around the plurality of partitions, and the maximum dimension (L30) of the coil former core in the axial direction may be longer than the dimension (L32) of each of the partitions in the axial direction. (Supplementary Note 3)

[0082] The stator according to supplementary note 2 may further comprise the housing element (181) which has a tubular shape and extends along the axial direction so that it surrounds the coil body, wherein the coil end may project beyond the end section (18t) of the housing element in the axial direction, and the coil body core may comprise the projecting wall section (34) which projects beyond the end section. (Supplementary Note 4)

[0083] In the stator according to supplementary note 3, the projecting wall section may comprise: the first projecting wall section (341) extending from the housing element in the first direction (DA1), which is a direction of the axial direction; and the second projecting wall section (342) extending from the housing element in the second direction (DA2), which is another direction of the axial direction, and the dimension (L341) of the first projecting wall section in the axial direction differs from the dimension (L342) of the second projecting wall section in the axial direction. (Supplementary Note 5)

[0084] In the stator according to supplementary note 3, the projecting wall section can comprise the first projecting wall section (341) extending from the housing element in the first direction (DA1), which is an axial direction, and the coil section can comprise the first coil end (361), which is the coil end formed on the end section of the coil section in the first direction, and the dimension (L341) of the first projecting wall section in the axial direction can be equal to or greater than the dimension (L361), in the axial direction, of a section of the first coil end extending from the housing element. (Supplementary Note 6)

[0085] In the stator according to supplementary note 5, the projecting wall section can comprise the second projecting wall section (342) which extends from the housing element in the second direction (DA2), which is a different direction from the axial direction, and the coil section can comprise the second coil end (362), which is the coil end formed on an end section of the coil section in the second direction, and the dimension (L342) of the second projecting wall section in the axial direction can be equal to or greater than the dimension (L362), in the axial direction, of a section of the second coil end extending from the housing element. (Supplementary Note 7)

[0086] In the stator according to supplementary note 3, the protruding wall section can be formed over the entire circumference of the coil core on at least one side of the coil body core in the axial direction. (Supplementary Note 8)

[0087] In the stator according to supplementary note 3, the protruding wall section can be formed on at least one side of the coil core in the axial direction, and the lead-out wire can be led out on a section corresponding to the protruding wall section. (Supplementary Note 9)

[0088] In the stator according to supplementary note 8, the coil section can include the majority of lead-out wires, and the majority of lead-out wires can be led out on a section corresponding to the same protruding wall section. (Supplementary Note 10)

[0089] In the stator, according to one of the supplementary notes 3 to 9, the housing element may be made of electrical steel. (Supplementary Note 11)

[0090] The stator according to supplementary note 10 may also include the insulating layer (28) formed on the inner wall (181i) of the housing element. (Supplementary Note 12)

[0091] In the stator, according to one of the supplementary notes 3 to 9, the housing element may be made of resin. (Supplementary Note 13)

[0092] The stator according to supplementary note 1 may further comprise the tubular stator core (182) including the toothed section (38), wherein the coiled section may be formed by the conductive wire wound around the toothed section. (Supplementary Note 14)

[0093] In the stator, according to one of the supplementary notes 1 to 13, the shrink tubing can be a heat shrink tube. (Supplementary Note 15)

[0094] The electric motor (10) according to the present disclosure comprises the stator according to one of the supplementary notes 1 to 14.

[0095] Although the present disclosure has been described in detail, it is not necessarily limited to each of the respective embodiments and modifications. Various additions, substitutions, changes, partial deletions, and the like may be made in the embodiments and modifications without deviating from the essence and core of the present disclosure, or without deviating from the essence and core of the present disclosure derived from the content and correspondences described in the claims. Furthermore, the embodiments and modifications may also be implemented together in combination. For example, in the embodiments and modifications described above, the sequence of each operation and the sequence of each process are shown only as examples, and the present invention is not necessarily limited to these examples.Furthermore, the same applies if numerical values ​​or mathematical expressions are used in the description of the aforementioned embodiments and variations. Reference symbol list 10 Electric motor 14 Rotor 16, 161, 162, 16A Stator 18, 181, 182 Housing element 18t final section 20 coil formers 22 coil section 24 heat shrink tubing 26 Lead wire 2 Insulation layer 30, 30A coil former core 32, 321 to 326 Partition wall 34, 34A Projecting wall section 36 Coil end 36i Inner Circumference Section 38th tooth section 44 Exit section 181i Interior wall 341 First projecting wall section 342 Second projecting wall section 361 First end of coil 362 Second end of coil L30 Maximum dimension L32, L341, L342, L361, L362 Dimensions QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP S50-124102 A [0002, 0003, 0006, 0044, 0062]

Claims

[1] Stator provided in an electric motor, comprising: a coil section formed in a ring shape to surround a rotor provided in an electric motor, the coil section having a coil end; and a heat shrink tube that covers the coil end without covering any inner circumferential section of the coil end, wherein A lead wire of the coil section is led out from a radially inner side of the coil section. [2] Stator according to claim 1, further comprising a coil former which supports the coil section, where the coil body includes: a coil core that has a tubular shape and extends in an axial direction; and a plurality of partition walls that project from the coil core in a radially outward direction of the coil core, and where the coil section is formed by a conductive wire wound around the majority of partitions, and a maximum dimension of the coil core in the axial direction is longer than a dimension of each of the partitions in the axial direction. [3] Stator according to claim 2, further comprising a housing element having a tubular shape and extending in the axial direction so that it surrounds the coil body, wherein the coil end projects beyond an end section, in the axial direction, of the housing element, and the coil core includes a protruding wall section that extends beyond the end section. [4] Stator according to claim 3, wherein the foreground wall section comprises: a first projecting wall section that extends from the housing element in a first direction which is a direction of the axial direction; and a second projecting wall section that extends from the housing element in a second direction, which is a different direction from the axial direction, and a dimension of the first projecting wall section in the axial direction differs from a dimension of the second projecting wall section in the axial direction. [5] Stator according to claim 3, wherein the projecting wall section comprises a first projecting wall section that extends from the housing element in a first direction which is a direction of the axial direction, the coil section comprises a first coil end, which is the coil end formed at an end section of the coil section in the first direction, and a dimension of the first projecting wall section in the axial direction is equal to or greater than a dimension, in the axial direction, of a section of the first coil end that projects from the housing element. [6] Stator according to claim 5, wherein the projecting wall section comprises a second projecting wall section that extends from the housing element in a second direction which is a different direction from the axial direction, the coil section includes a second coil end, which is the coil end formed at an end section of the coil section in the second direction, and a dimension of the second projecting wall section in the axial direction is equal to or greater than a dimension, in the axial direction, of a section of the second coil end that projects from the housing element. [7] Stator according to claim 3, wherein on at least one side of the coil core the protruding wall section is formed over an entire circumference of the coil core in the axial direction. [8] Stator according to claim 3, wherein on at least one side of the coil core in the axial direction, the protruding wall section is formed on a part of the coil core when viewed in the axial direction, and The lead wire is led out at a section that corresponds to the protruding wall section. [9] Stator according to claim 8, wherein the coil section includes a majority of the lead-out wires, and the majority of the lead-out wires are led out on a section that corresponds to the same protruding wall section. [10] Stator according to any one of claims 3 to 9, wherein the housing element is made of electrical steel. [11] Stator according to claim 10, further comprising an insulating layer formed on an inner wall of the housing element. [12] Stator according to any one of claims 3 to 9, wherein the housing element is made of resin. [13] Stator according to claim 1, further comprising a tubular stator core including a tooth section, wherein the coil section is formed by a conductive wire wound around the tooth section. [14] Stator according to any one of claims 1 to 13, wherein the shrink tubing is a heat shrink tubing. [15] Electric motor comprising the stator according to any one of claims 1 to 14.

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