Rotary electric machine

Abstract

To provide a rotary electric machine that prevents damage to an insulator, has high insulation reliability, and improves motor efficiency.SOLUTION: A rotary electric machine 1 includes a rotor 3, a stator core 5, and a stator 2 having a coil formed by winding a conductor around the stator core 5 via an insulator 9. The stator core 5 includes an annular back yoke portion 10, and a plurality of tooth portions 11 protruding from an inner side X1 of the back yoke portion 10 in a radial direction X of the rotary electric machine at predetermined intervals in a circumferential direction Z of the rotary electric machine 1. The insulator 9 includes a seat portion 14 installed on an end face of the stator core 5 in an axial direction Y of the rotary electric machine 1, and a protrusion 13 formed to protrude in the axial direction Y from the seat portion 14 so as to fit into a surface of the stator core 5 extending in the axial direction Y. The stator core 5 includes a separated portion 100 formed by being recessed so as to be separated from the insulator 9 at a point where the seat portion 14 and the protrusion 13 of the insulator 9 intersect.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to a rotating electric machine. [Background technology]

[0002] A conventional rotating electric machine is composed of a rotatable rotor and a stator arranged on the outer periphery of the rotor. The stator has a stator core, insulators, and coils. A pair of insulators is fitted to both sides of the stator core in the axial direction, and the coils are attached to the teeth of the stator core via the pair of insulators. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7218854 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional rotating electric machines, to prevent the insulator from falling off the stator core after it is inserted into the stator core and before winding is performed on the production line, the width between the protruding parts of the insulator is made smaller than the width of the teeth of the stator core, thereby ensuring that the insulator is tightly attached to the core. However, when the insulator is inserted into the stator core, stress is concentrated near the base of the protruding parts of the insulator, which can cause damage.

[0005] The present disclosure discloses technology for solving the above-mentioned problems, and aims to provide a rotating electric machine that prevents damage to insulators, has high insulation reliability, and improves motor efficiency. [Means for solving the problem]

[0006] The rotating electric machine of the present disclosure comprises: a rotor that rotates with the shaft; a rotor and a stator disposed radially outwardly of the rotor across a gap, The stator includes a stator core and a coil formed by winding a conducting wire around the stator core via an insulator, The stator core is an annular back yoke portion; a plurality of teeth protruding from the inner side of the back yoke portion in the radial direction of the rotating electric machine at predetermined intervals in the circumferential direction of the rotating electric machine; The insulator is a seat portion provided on an end surface of the stator core in the axial direction of the rotary electric machine; a protrusion formed to protrude in the axial direction from the seat portion so as to fit onto a surface of the stator core extending in the axial direction, The stator core has a portion where the bearing surface portion of the insulator and the protrusion intersect. and a separation portion formed by being recessed so as to separate from the insulator. It is something. [Effects of the Invention]

[0007] According to the rotating electric machine of the present disclosure, it is possible to obtain a rotating electric machine that prevents damage to the insulator, has high insulation reliability, and improves motor efficiency. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view showing the configuration of a rotating electric machine according to a first embodiment. [Figure 2] 2 is a cross-sectional view showing a cross section of the rotating electric machine shown in FIG. 1 along line H1-H1. [Figure 3] 2 is a plan view showing the configuration of a stator core of the rotating electric machine shown in FIG. [Figure 4] 4A and 4B are plan views showing the configuration of the plate material of the stator core shown in FIG. [Figure 5] 2 is a perspective view showing the configuration of an insulator for the rotating electric machine according to the first embodiment. FIG. [Figure 6] FIG. 6 is a plan view showing the configuration of the insulator shown in FIG. [Figure 7] 6 is an exploded perspective view of the stator core shown in FIG. 1 and the insulator shown in FIG. 5. [Figure 8] 8 is a perspective view showing a state in which the stator core and the insulator shown in FIG. 7 are assembled. FIG. [Figure 9] 9 is a side view showing a state in which the stator core and the insulator shown in FIG. 8 are assembled. [Figure 10] 10 is a cross-sectional view showing the stator core and the insulator shown in FIG. 9 in an assembled state, taken along line H2-H2. [Figure 11] 11A is an exploded cross-sectional view of the stator core and the insulator taken along the line H4-H4 in FIG. 9, and FIG. 11B is a cross-sectional view showing the stator core and the insulator in FIG. 11A in an assembled state. [Figure 12] 12A is an exploded cross-sectional view of the stator core and the insulator taken along the line H3-H3 in FIG. 10, and FIG. 12B is a cross-sectional view showing the stator core and the insulator in FIG. 12A assembled together. [Figure 13] 13A, 13B, and 13C are plan views showing the configuration of plates forming the stator core in the second embodiment. [Figure 14] FIG. 10 is a cross-sectional view showing the relationship between a stator core and an insulator in a second embodiment. [Figure 15] FIG. 10 is a cross-sectional view showing the relationship between a stator core and an insulator in a second embodiment. [Figure 16] FIG. 11 is a cross-sectional view showing the relationship between a stator core and an insulator in a third embodiment. [Figure 17] FIG. 11 is a cross-sectional view showing the relationship between a stator core and an insulator in a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] In the following description, each direction in the rotating electric machine 1 will be referred to as the circumferential direction Z, the axial direction Y, the radial direction X, the outer side X1 of the radial direction X, and the inner side X2 of the radial direction X. Therefore, each location constituting the rotating electric machine 1 will also be described with reference to these directions. However, in each drawing other than FIG. 2 that shows the radial direction X, the outer side X1, and the inner side X2, the radial direction X at approximately the center position of the circumferential direction Z is used as the reference.

[0010] Embodiment 1 FIG. 1 is a cross-sectional view showing the configuration of a rotating electric machine according to a first embodiment. FIG. 2 is a cross-sectional view showing a cross section taken along line H1-H1 of the rotating electric machine shown in FIG. 1, as viewed from the direction of the arrows. FIG. 3 is a plan view showing the configuration of a stator core of the rotating electric machine shown in FIG. 1. FIGS. 4A and 4B are plan views showing the configuration of a plate material of the stator core shown in FIG. 3. FIG. 5 is a perspective view showing the configuration of an insulator for the rotating electric machine according to the first embodiment, as viewed from the direction of arrow A of the insulator shown in FIG. 7. FIG. 6 is a plan view showing the configuration of the insulator shown in FIG. 5, as viewed from the direction of arrow A of the insulator shown in FIG. 7.

[0011] FIG. 7 is an exploded perspective view of the stator core shown in FIG. 1 and the insulator shown in FIG. 5. FIG. 8 is a perspective view showing the stator core and insulator shown in FIG. 7 in an assembled state. FIG. 9 is a side view showing the stator core and insulator shown in FIG. 8 in an assembled state. FIG. 10 is a cross-sectional view showing a cross section of the stator core and insulator shown in FIG. 9 in an assembled state, taken along line H2-H2. FIG. 11A is an exploded cross-sectional view of the stator core and insulator taken along line H4-H4 in FIG. 9, and FIG. 11B is a cross-sectional view showing the stator core and insulator of FIG. 11A in an assembled state. FIG. 12A is an exploded cross-sectional view of the stator core and insulator taken along line H3-H3 in FIG. 10, and FIG. 12B is a cross-sectional view showing the stator core and insulator of FIG. 12A in an assembled state.

[0012] 1 and 2, the rotating electric machine 1 includes a stator 2, a rotor 3, and a shaft 7, all of which are housed in a frame 4. The frame 4 is formed in a cylindrical shape having end wall portions 401 on both ends in the axial direction Y. The shaft 7 is rotatably supported by a pair of bearings (not shown) fixed to the pair of end wall portions 401 of the frame 4. The rotor 3 is fixed to the shaft 7 and rotates together with the shaft 7.

[0013] The stator 2 is disposed opposite the rotor 3 on the outside X1 in the radial direction X of the rotor 3 via a gap. The stator 2 has a plurality of stator cores 5 of the same shape fixed to the inner wall surface of the frame 4, and coils 6 formed by winding a conductor (winding) around each stator core 5 via an insulator 9 (see FIG. 8). Each stator core 5 is formed by stacking a plurality of magnetic steel plate materials 51 and 52 (see FIG. 4), which will be described later, in the axial direction Y. The insulator 9 is formed of an insulating resin member and insulates the stator cores 5 from the coils 6.

[0014] 3, the stator core 5 has a back yoke portion 10 extending in the circumferential direction Z, and teeth portions 11. The back yoke portion 10 includes an outer circumferential surface portion 105 formed in an arc shape and extending in the axial direction Y from the outer side X1 in the radial direction X, an inner circumferential surface portion 106 extending in the axial direction Y from the inner side X2 in the radial direction X, and a pair of circumferential end surface portions 107 connecting the outer circumferential surface portion 105 and the inner circumferential surface portion 106 and extending in the axial direction Y. The teeth portions 11 are formed to extend from the center in the circumferential direction Z of the inner circumferential surface portion 106 of the back yoke portion 10 toward the central axis of the rotating electric machine 1, i.e., the inner side X2 in the radial direction X.

[0015] The tooth portion 11 has a pair of tooth side portions 115 on both sides in the circumferential direction Z and extending in the axial direction Y, and a tip surface portion 116 that faces the rotor 3 on the inner side X2 in the radial direction X with a gap (air gap) therebetween and extends in the axial direction Y. Note that a shoe portion may be provided on the tip surface portion 116. Furthermore, the outer peripheral surface portion 105 of the back yoke portion 10 has a recess 12 recessed toward the inner side X2 in the radial direction X at the end in the axial direction Y of the central portion in the circumferential direction Z. The recess 12 is provided to extend a predetermined length in the axial direction Y.

[0016] As shown in FIG. 1 , the stator cores 5 are fixed to the inner peripheral surface of the frame 4 with the peripheral end surfaces 107 of the back yoke portions 10 abutting against each other to form a circular arrangement. Because the stator cores 5 are arranged in a circular shape, the back yoke portion 10 is formed in a circular shape as a whole, and multiple teeth portions 11 are formed at predetermined intervals in the circumferential direction Z. Therefore, the multiple coils 6 wound around each tooth portion 11 are arranged at equal intervals in the circumferential direction Z of the rotating electric machine 1. The coils 6 are connected to each other, for example, at one end or both ends in the axial direction Y of the stator 2, to form a concentrated winding three-phase coil. The rotor 3 includes, for example, multiple field poles (not shown) formed by permanent magnets fixed to the rotor core.

[0017] When the rotating electric machine 1 operates as an electric motor, a rotational force is generated in the rotor 3 based on the interaction between the rotating magnetic flux generated by passing a current through the coil 6 of the stator 2 and the magnetic flux generated by the field magnetic poles of the rotor 3, causing the rotor 3 to rotate together with the shaft 7. When the rotating electric machine 1 operates as a generator, the rotor 3 is driven to rotate by, for example, an internal combustion engine, and the magnetic flux generated by the field magnetic poles of the rotor 3 interlinks with the coil 6 of the stator 2, inducing a voltage in the coil 6, and power based on that voltage is output.

[0018] The insulators 9 are installed at both ends of the stator core 5 in the axial direction Y to insulate the stator core 5 from the coils 6 (see FIG. 9). As shown in FIGS. 5 and 6, the insulators 9 have a seat portion 14 installed on the end surface of the stator core 5 in the axial direction Y of the rotating electric machine 1, and a protrusion 13 formed to protrude in the axial direction Y from the seat portion 14 so as to fit into a surface of the stator core 5 extending in the axial direction Y.

[0019] The seating surface portions 14 include tooth seating surface portions 141 that are placed on the tooth portions 11, and back yoke seating surface portions 142 that are placed on the back yoke portion 10. The protrusions 13 include a first protrusion 131, a second protrusion 132, and a third protrusion 133. The first protrusions 131 are formed on both sides of the tooth portions 11 in the circumferential direction Z so as to fit with a pair of tooth side surface portions 115 of the tooth portions 11 of the stator core 5. The second protrusions 132 are formed on both sides of the tooth portions 11 in the circumferential direction Z so as to fit with inner peripheral surface portions 106 of the back yoke portion 10 of the stator core 5.

[0020] The third protrusion 133 is formed to fit into a recess 12 formed in the outer peripheral surface 105 of the back yoke portion 10 of the stator core 5. The first protrusion 131 and the second protrusion 132 are formed integrally. The length in the axial direction Y of the first protrusion 131 and the second protrusion 132 does not need to be the same as the length in the axial direction Y of the third protrusion 133, and in this embodiment, the length in the axial direction Y of the first protrusion 131 and the second protrusion 132 is formed to be longer than the length in the axial direction Y of the third protrusion 133.

[0021] The insulator 9 also includes a first flange 15 that prevents the coil 6 from protruding from an inner side X2 in the radial direction X of the tooth seating surface portion 141, and a second flange 16 that prevents the coil 6 from protruding from an outer side X1 in the radial direction X of the tooth seating surface portion 141. The pair of second protrusions 132 shown above are formed integrally with the second flange 16.

[0022] 3, 11, and 12, the stator core 5 includes a separated portion 100 formed by being recessed away from the insulator 9 at the location where the bearing surface portion 14 of the insulator 9 intersects with the protruding portion 13. In this embodiment, the separated portion 100 is formed as a stepped portion. The separated portion 100 includes a first separated portion 111, a second separated portion 112, and a third separated portion 113.

[0023] The first separated portion 111 is formed at the point where the tooth seating surface portion 141 and the first protrusion 131 intersect. The width of the first separated portion 111 in the circumferential direction Z is defined as width W3. The second separated portion 112 is formed at the point where the back yoke seating surface portion 142 and the second protrusion 132 intersect. The width of the second separated portion 112 in the radial direction X is defined as width T3. The third separated portion 113 is formed at the point where the back yoke seating surface portion 142 and the third protrusion 133 intersect. The width of the third separated portion 113 in the radial direction X is defined as width T6.

[0024] To form these separated portions 100 in the stator core 5, specifically, two types of plate materials 51 and 52 shown in Fig. 4 are appropriately stacked in the axial direction Y. The plate material 51 is stacked in the locations where the separated portions 100 are to be formed at both ends of the stator core 5 in the axial direction Y. The plate material 52 is stacked in the locations where the separated portions 100 are not to be formed at both ends of the stator core 5 in the axial direction Y. The size of the plate material 51 in the locations where the separated portions 100 are formed is smaller than the size of the plate material 52 in the locations where the separated portions 100 are not formed.

[0025] If the width of the teeth 11 of the plate material 51 in the circumferential direction Z is width W2 and the width of the teeth 11 of the plate material 52 in the circumferential direction Z is width W1, then there is a relationship of W1 > W2. Therefore, the width W3 of the first separated portion 111 is half the difference between these widths, or (W1 - W2) / 2 = W3. Furthermore, if the width from the outer peripheral surface 105 to the inner peripheral surface 106 at the peripheral end surface 107 of the back yoke portion 10 of the plate material 51 is width T2 and the width from the outer peripheral surface 105 to the inner peripheral surface 106 at the peripheral end surface 107 of the back yoke portion 10 of the plate material 52 is width T1, then there is a relationship of T1 > T2. Therefore, the width T3 of the second separated portion 112 is T1 - T2 = T3.

[0026] Furthermore, if the width from outer peripheral surface 105 to the bottom of recess 12 in back yoke portion 10 of plate material 51 is width T5, and the width from outer peripheral surface 105 to the bottom of recess 12 in back yoke portion 10 of plate material 52 is width T4, then there is a relationship of T5 > T4. Therefore, width T6 of third separated portion 113 is T5 - T4 = T6.

[0027] 11 and 12, when the intersection of the bearing surface portion 14 and the protruding portion 13 of the insulator 9 is formed by a curved surface 19, each separated portion 100 is formed so as to separate from the curved surface 19. Therefore, the widths W3, T3, T6 of the separated portions 111, 112, 113 do not need to be the same, and are formed appropriately according to the size of the curved surface 19 at each location.

[0028] Since the separated portions 100 are formed in this manner, for example, in the locations where the first separated portions 111 are formed on both ends in the axial direction Y, in order to assemble the insulator 9 to the stator core 5 by press-fitting, as shown in Fig. 11A, if the width in the circumferential direction Z of the portion of the insulator 9 where it is inserted into the teeth portion 11 is width W4, then the relationships W4 > W2 and W1 > W4 (this relationship allows press-fitting) are set. As a result, the stator core 5 and the insulator 9 have a press-fit relationship in the circumferential direction Z.

[0029] 12A, if the width in the radial direction X of the portion of insulator 9 inserted into back yoke portion 10 is width T7, the width in the radial direction X of back yoke portion 10 where second separated portion 112 and third separated portion 113 are formed is width T8, and the width in the radial direction X of back yoke portion 10 where second separated portion 112 and third separated portion 113 are not formed is width T9, then the relationships are set to satisfy T7>T8 and T9>T7 (this relationship allows for press-fitting). As a result, stator core 5 and insulator 9 have a press-fit relationship in the radial direction X.

[0030] Furthermore, when the intersection of the seat portion 14 of the insulator 9 and the protrusion 13 is formed by a curved surface 19 as shown in Figures 11 and 12, each detached portion 100 is formed so as to detach from the curved surface 19, thereby preventing interference between the detached portion 100 of the tooth portion 11 and the curved surface 19 of the insulator 9, and providing a configuration that makes it easy and reliable to press the insulator 9 into the stator core 5.

[0031] Next, a method for manufacturing the rotating electric machine of the first embodiment configured as described above will be described. As shown in Fig. 7, the insulator 9 is inserted into the stator core 5 from one side in the axial direction Y of the stator core 5 in the direction of arrow B. As a result, the insulator 9 is attached to the stator core 5 as shown in Fig. 8. Furthermore, as shown in Fig. 9, the insulator 9 is similarly attached to the stator core 5 from the other side in the axial direction Y of the stator core 5.

[0032] In this manufacturing process, after the insulator 9 is inserted into the stator core 5, the insulator 9 is press-fit into the stator core 5 in accordance with the relationship described above to prevent the insulator 9 from falling off from the stator core 5 until winding is performed. The pair of first protrusions 131 of the insulator 9 are press-fit into the pair of tooth side surfaces 115 of the tooth portion 11 of the stator core 5, thereby fixing the stator core 5 and the insulator 9 in the circumferential direction Z.

[0033] Furthermore, by press-fitting the pair of second protrusions 132 of the insulator 9 into the inner circumferential surface 106 of the stator core 5, a force is applied in the outward X1 direction of the radial direction X, and by press-fitting the third protrusions 133 of the insulator 9 into the recesses 12 of the stator core 5, a force is applied in the inward X2 direction of the radial direction X. As a result, the stator core 5 and the insulator 9 are press-fit and fixed in the radial direction X. The other insulator 9 and stator core 5 in the axial direction Y have the same configuration, and therefore a description thereof will be omitted. The insulator 9 is attached to cover the teeth 11 of the stator core 5 and the side surfaces of the teeth. Then, a copper wire, for example, is wound around the teeth 11 of the stator core 5 with the insulator 9 interposed therebetween to form the coil 6.

[0034] Generally, since insulators are molded from resin, even if the corner where the insulator meets the protrusion is designed to be a right angle, a slight curve is formed on the anti-protrusion (base) side of the protrusion, which means that the insulator and stator core do not fit together tightly, increasing the circumference of the conductor and reducing the motor efficiency of the rotating electric machine.

[0035] In the first embodiment, when the intersection of the protruding portion 13 and the seating surface portion 14 of the insulator 9 is formed by a curved surface 19, each of the separated portions 111, 112, and 113 is formed larger than the curved surface 19. Therefore, even if the curvature of each of the curved surfaces 19 at the intersection of the first protruding portion 131 and the tooth seating surface portion 141, the intersection of the second protruding portion 132 and the back yoke seating surface portion 142, and the intersection of the third protruding portion 133 and the back yoke seating surface portion 142 are different, because each of the separated portions 111, 112, and 113 is formed larger than the curved surface 19, stress concentration can be suppressed and damage to the insulator 9 can be prevented.

[0036] In this embodiment, when the stator core 5 and the insulator 9 are press-fitted together, as described above, the insulator 9 is press-fitted into the stator core 5 in two directions, the circumferential direction Z and the radial direction X. However, this is not limited to this, and the insulator 9 may be press-fitted only in the circumferential direction Z or only in the radial direction X.

[0037] In the first embodiment, an example in which the stator cores 5 are formed is shown, but the present invention is not limited to this and the stator cores 5 can also be formed from a single annular stator core. This also applies to the following embodiments, so a description thereof will be omitted.

[0038] According to the rotating electric machine of the first embodiment configured as above, a rotor that rotates with the shaft; a rotor and a stator disposed radially outwardly of the rotor across a gap, The stator includes a stator core and a coil formed by winding a conducting wire around the stator core via an insulator, The stator core is an annular back yoke portion; a plurality of teeth protruding from the inner side of the back yoke portion in the radial direction of the rotating electric machine at predetermined intervals in the circumferential direction of the rotating electric machine; The insulator is a seat portion provided on an end surface of the stator core in the axial direction of the rotary electric machine; a protrusion formed to protrude in the axial direction from the seat portion so as to fit onto a surface of the stator core extending in the axial direction, The stator core has a portion where the bearing surface portion of the insulator and the protrusion intersect. and a separation portion formed by being recessed so as to separate from the insulator. So, The insulator is installed so that the axially protruding side of the insulator's protrusion is in close contact with the axially extending surface of the stator core, and further, the detached portion of the insulator ensures that the axially opposite protruding side (root side) of the insulator's protrusion is spaced from the axially extending surface of the stator core. This reduces the stress on the opposite protruding side of the insulator's protrusion, thereby preventing damage to the insulator and resulting in a rotating electric machine with high insulation reliability. Furthermore, when the insulator is pressed into the stator core, the stator core is pressed into the axial protruding side of the protrusion on the insulator, thereby moving the point of action away from the axial opposite protruding side of the insulator's protrusion, thereby reducing the stress acting on the axial opposite protruding side of the protrusion.

[0039] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, When the intersection of the seat portion of the insulator and the protrusion is formed as a curved surface, The separated portion is formed separated from the curved surface, Even if the intersection of the seating surface portion and the protrusion is curved, the seating surface portion of the insulator and the axial end face of the stator core can be reliably brought into close contact, thereby reliably preventing a decrease in motor efficiency.

[0040] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, the protrusions are formed at positions that fit with surfaces of the teeth of the stator core on both sides in the circumferential direction and that extend in the axial direction, The separated portions are formed at positions corresponding to the axial ends of the teeth of the stator core on both sides in the circumferential direction. Damage to the insulators on both sides of the teeth in the circumferential direction can be reliably prevented, and a rotating electric machine with high insulation reliability can be obtained. Furthermore, when the stator core and the insulator are press-fitted together, the stator core and the insulator can be installed by press-fitting them in the circumferential direction, which prevents a decrease in the insulation reliability of the insulator.

[0041] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, the protrusion is formed at a location that is radially inside the back yoke portion of the stator core and that engages with a surface that extends in the axial direction, The separated portion is formed at a location radially inside the back yoke portion of the stator core and corresponding to an end portion in the axial direction. Damage to the insulator on the radially inner side of the back yoke portion can be reliably prevented, and a rotating electric machine with high insulation reliability can be obtained.

[0042] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, the stator core has a recessed portion that is recessed radially inward at an end portion in the axial direction and radially outward of the back yoke portion, the protrusion is formed at a position that fits into the recess of the back yoke portion of the stator core, The separated portion is formed at an axial end of the recessed portion of the back yoke portion of the stator core, Damage to the insulator at the recessed portion can be reliably prevented, and a rotating electrical machine with high insulation reliability can be obtained. Furthermore, when the stator core and the insulator are press-fitted together, the stator core and the insulator can be installed by being press-fitted together in the radial direction, which prevents a decrease in the insulation reliability of the insulator.

[0043] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, The separated portion is formed by a step portion, The manufacturing costs of the rotating electrical machine can be reduced.

[0044] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, The stator core is formed by stacking a plurality of plates in the axial direction, The size of the plate material at the portion where the separated portion is formed is smaller than the size of the plate material at the portion where the separated portion is not formed, The separated portion of the rotating electrical machine can be formed with a simple configuration.

[0045] Embodiment 2 13A, 13B, and 13C are plan views showing the configuration of plates forming a stator core in embodiment 2. FIG. 14 is a cross-sectional view showing the relationship between the stator core and insulators in embodiment 2, showing the same parts as in FIG. 11B of embodiment 1. FIG. 15 is a cross-sectional view showing the relationship between the stator core and insulators in embodiment 2, showing the same parts as in FIG. 12B of embodiment 1. In each figure, parts similar to those in embodiment 1 above are omitted and are designated by the same reference numerals.

[0046] In the above-described Embodiment 1, an example in which the separation portion 100 is formed by a stepped portion with a single-step step has been shown. In the present Embodiment 2, an example in which the stepped portion of the separation portion 100 is formed by a two-step step will be described. Therefore, here, as shown in FIG. 13, one more type of plate material constituting the stator core 5 is prepared than in the case of Embodiment 1, and three types of plate materials 51, 52, and 53 are prepared. Specifically, in Embodiment 2, assuming that the width in the circumferential direction Z of the teeth portion 11 of the plate material 53 is W5, the relationship of the widths in the circumferential direction Z of the teeth portions 11 of the respective plate materials 51, 52, and 53 is set as W2 < W5 < W1 and is correspondingly set to decrease as going toward the anti-projecting side in the axial direction Y. Although only the relationship of the teeth portion 11 is shown here, the relationships of the other separation portions 100 are formed in the same manner, and the description thereof is omitted.

[0047] Then, as shown in FIGS. 14 and 15, these plate materials 51, 52, and 53 are laminated in an appropriate number in the axial direction Y. Then, as shown in FIGS. 14 and 15, the first separation portion 111, the second separation portion 112, and the third separation portion 113 are formed by a two-step step. Therefore, the separation portion 100 having a two-step step is formed. That is, the separation portion 100 is formed such that the distance of separation in the direction away from the axial direction Y from the location where the seating surface portion 14 and the projecting portion 13 of the insulator 9 intersect becomes narrower.

[0048] When the stator core 5 and the insulator 9 are press-fitted, for example, the location where the pair of tooth side surface portions 115 of the teeth portion 11 and the first projecting portion 131 are in close contact becomes farther from the acting point on the anti-projecting side (base side) of the first projecting portion 131 as it approaches the tip side of the first projecting portion 131. For this reason, the stress around the anti-projecting side (base side) of the first projecting portion 131 can be reduced. The same phenomenon also occurs with the other projecting portions 13.

[0049] However, when the separation part 100 becomes large, the motor efficiency may decrease. In the second embodiment, the relationship between the widths in the circumferential direction Z of the teeth 11 of the respective plate materials 51, 52, 53 is set as W2 < W5 < W1, and it is set and corresponding so as to become smaller according to the anti-projecting side in the axial direction Y. Further, thereby, by press-fitting the tip side of each protruding part 13 provided on the insulator 9 into the stator core 5, the acting point from the anti-projecting (base) side of the protruding part 13 is made far, and while reducing the stress applied to the anti-projecting (base) side of the protruding part 13, by forming the separation part 100 with a plurality of steps, a decrease in motor efficiency can be suppressed.

[0050] According to the rotating electric machine of the second embodiment configured as described above, while exhibiting the same effects as those of the first embodiment, the stepped portion of the separation part is formed with a plurality of steps, since the distance of separation in the axial direction is formed to become narrower from the location where the seat surface portion of the insulator and the protruding part intersect, compared with the case of forming with a stepped portion of a single step, a decrease in the motor efficiency of the rotating electric machine can be suppressed.

[0051] Embodiment 3. FIG. 16 is a cross-sectional view showing the relationship between the stator core and the insulator in the third embodiment, and is a view showing the same portion as FIG. 11B in the first embodiment. FIG. 17 is a cross-sectional view showing the relationship between the stator core and the insulator in the third embodiment, and is a view showing the same portion as FIG. 12B in the first embodiment. In each figure, the same parts as those in the above-described respective embodiments are denoted by the same reference numerals and omitted.

[0052] In the third embodiment, multiple types of plate materials constituting the stator core 5 are prepared and appropriately stacked in the axial direction Y, thereby forming a stepped portion of the separated portion 100 (111, 112, 113) with three or more steps, as shown in FIGS. 16 and 17 . By forming the separated portion 100 in this manner, the width of the tooth portion 11 in the circumferential direction Z gradually increases toward the tip of the protruding portion 13 in the axial direction Y, and the separated portion 100 has a tapered shape. That is, the separated portion 100 is formed so that the distance from the intersection of the seating surface portion 14 of the insulator 9 and the protruding portion 13 decreases in the direction away from the seating surface portion 14 in the insulator 9, as the distance decreases in the direction away from the seating surface portion 14 in the insulator 9. This makes it easier to insert the insulator 9 into the stator core 5. Furthermore, by forming the separated portion 100 with even more stepped portions, a decrease in the motor efficiency of the rotating electric machine can be further suppressed.

[0053] The rotating electric machine of the third embodiment configured as described above has the same effects as those of the above embodiments, and also has the following advantages: the step portion of the separated portion is formed by a plurality of steps, The insulator is formed so that the distance between the seat portion and the protrusion of the insulator and the intersection point thereof becomes narrower in the axial direction away from the intersection point. Here, the step is formed with three or more steps, which makes it possible to suppress a decrease in motor efficiency of the rotating electric machine and makes it easier to attach the insulator to the stator core compared to the separated portion in the above embodiment.

[0054] Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not exemplified are conceivable within the scope of the technology disclosed in this specification, including, for example, cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of another embodiment.

[0055] Various aspects of the present disclosure are summarized below as appendices.

[0056] (Appendix 1) a rotor that rotates with the shaft; a rotor and a stator disposed radially outwardly of the rotor across a gap, The stator includes a stator core and a coil formed by winding a conducting wire around the stator core via an insulator, The stator core is an annular back yoke portion; a plurality of teeth protruding from the inner side of the back yoke portion in the radial direction of the rotating electric machine at predetermined intervals in the circumferential direction of the rotating electric machine; The insulator is a seat portion provided on an end surface of the stator core in the axial direction of the rotary electric machine; a protrusion formed to protrude in the axial direction from the seat portion so as to fit onto a surface of the stator core extending in the axial direction, The stator core has a portion where the bearing surface portion of the insulator and the protrusion intersect. and a separation portion formed by being recessed so as to be separated from the insulator. (Appendix 2) When the intersection of the seat portion of the insulator and the protrusion is formed as a curved surface, 2. The rotating electric machine according to claim 1, wherein the separated portion is formed separated from the curved surface. (Appendix 3) the protrusions are formed at positions that fit with surfaces of the teeth of the stator core on both sides in the circumferential direction and that extend in the axial direction, The rotating electric machine according to claim 1 or 2, wherein the separated portions are formed on both circumferential sides of the teeth of the stator core at locations corresponding to axial ends. (Appendix 4) the protrusion is formed at a location that is radially inside the back yoke portion of the stator core and that engages with a surface that extends in the axial direction, The rotating electric machine according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the separated portion is formed at a position radially inside the back yoke portion of the stator core and corresponding to an end portion in the axial direction. (Appendix 5) the stator core has a recessed portion that is recessed radially inward at an end portion in the axial direction and radially outward of the back yoke portion, the protrusion is formed at a position that fits into the recess of the back yoke portion of the stator core, 5. The rotating electric machine according to claim 1, wherein the separated portion is formed at an axial end of the recess in the back yoke portion of the stator core. (Appendix 6) 6. The rotating electric machine according to claim 1, wherein the separated portion is formed by a step portion. (Appendix 7) the step portion of the separated portion is formed by a plurality of steps, 7. The rotating electric machine according to claim 6, wherein the insulator is formed so that the distance separating from the point where the seat portion and the protrusion intersect becomes narrower in the axial direction. (Appendix 8) The stator core is formed by stacking a plurality of plates in the axial direction, 8. The rotating electric machine according to claim 6 or 7, wherein the size of the plate material at the location where the separated portion is formed is smaller than the size of the plate material at the location where the separated portion is not formed. [Explanation of symbols]

[0057] 1. Rotating electric machine, 2. Stator, 3. Rotor, 4. Frame, 5. Stator core, 6 coil, 7 shaft, 9 insulator, 10 back yoke part, 105 outer circumferential surface section, 106 inner circumferential surface section, 107 circumferential end surface section, 11 teeth section, 111 First Separation Section, 112 Second Separation Section, 113 Third Separation Section, 115 tooth side surface portion, 116 tip surface portion, 12 recess portion, 13 protrusion portion, 131 1st protrusion, 132 2nd protrusion, 133 3rd protrusion, 14 seat surface, 141 Tetsuza face, 142 Tetsuzu face, 15 1st shoulder part, 16 2nd flange, 14 seat surface, 19 curved surface, X radial direction, X1 outer side, X2 inner side, Y-axis direction, Z circumferential direction.

Claims

1. a rotor that rotates with the shaft; a rotor and a stator disposed radially outwardly of the rotor across a gap, The stator includes a stator core and a coil formed by winding a conducting wire around the stator core via an insulator, The stator core is an annular back yoke portion; a plurality of teeth protruding from the inner side of the back yoke portion in the radial direction of the rotating electric machine at predetermined intervals in the circumferential direction of the rotating electric machine; The insulator is a seat portion provided on an end surface of the stator core in the axial direction of the rotary electric machine; a protrusion formed to protrude in the axial direction from the seat portion so as to fit onto a surface of the stator core extending in the axial direction, The stator core has a recessed portion formed at a location where the bearing surface portion of the insulator and the protruding portion intersect, the recessed portion being spaced away from the insulator.

2. When the intersection of the seat portion of the insulator and the protrusion is formed as a curved surface, The rotating electric machine according to claim 1 , wherein the separated portion is formed separated from the curved surface.

3. the protrusions are formed at positions that fit with surfaces of the teeth of the stator core on both sides in the circumferential direction and that extend in the axial direction, The rotating electric machine according to claim 1 , wherein the separated portions are formed on both circumferential sides of the teeth of the stator core at locations corresponding to axial ends.

4. the protrusion is formed at a location that is radially inside the back yoke portion of the stator core and that engages with a surface that extends in the axial direction, The rotating electric machine according to claim 1 , wherein the separated portion is formed at a position radially inside the back yoke portion of the stator core and corresponding to an end portion in the axial direction.

5. the stator core has a recessed portion that is recessed radially inward at an end portion in the axial direction and radially outward of the back yoke portion, the protrusion is formed at a position that fits into the recess of the back yoke portion of the stator core, The rotating electric machine according to claim 4 , wherein the separated portion is formed at an axial end of the recess in the back yoke portion of the stator core.

6. The rotating electric machine according to claim 1 , wherein the separated portion is formed by a step portion.

7. the step portion of the separated portion is formed by a plurality of steps, 7. The rotating electric machine according to claim 6, wherein the insulator is formed so that a distance between the seating surface portion and the protruding portion of the insulator and a point where the seating surface portion and the protruding portion intersect each other becomes narrower in the axial direction away from the point.

8. The stator core is formed by stacking a plurality of plates in the axial direction, The rotating electric machine according to claim 6, wherein the size of the plate material at the portion where the separated portion is formed is smaller than the size of the plate material at the portion where the separated portion is not formed.

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