Armature and rotary electric machine

Abstract

To provide an armature having a high torque improvement effect by a magnetic wedge.SOLUTION: The armature includes an armature core including a yoke portion, a plurality of tooth portions each protruding from the yoke portion toward one side in a radial direction and extending, and a slot formed between adjacent tooth portions, a coil accommodated in the slot and configured to excite the armature core, and a magnetic wedge including a magnetic material and disposed on one side in the radial direction with respect to the coil in the slot so as to face the coil. The magnetic wedge includes a first body portion extending in the axial direction of the armature core and in contact with a first surface of the tooth portion, a second body portion extending in the axial direction of the armature core and in contact with a second surface facing the first surface of the tooth portion, and a coupling portion coupling the first body portion and the second body portion in the circumferential direction. A gap portion extending in the axial direction of the armature core is formed between the first body portion and the second body portion in the slot.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an armature and a rotating electric machine. [Background technology]

[0002] A conventionally known configuration is one in which radially extending teeth are formed in a comb-like shape on the armature core of a rotating electric machine, and a coil formed in a ring shape in advance is fitted radially into a slot between the teeth. In armatures with this type of configuration, an open slot shape is adopted in which the slot ends of the armature core are open, and therefore a wedge member is required to prevent the coil from coming off the armature core in the radial direction.

[0003] As an example of the wedge member, a magnetic wedge with magnetic permeability close to that of the armature core is sometimes used to suppress performance degradation of a rotating electric machine due to the open slots of the armature core (for example, Patent Documents 1 and 2). Because the magnetic wedge has a higher magnetic permeability than a non-magnetic wedge member, it reduces electrical resistance in the magnetic circuit of the rotating electric machine and contributes to improving torque. In addition, the magnetic wedge has the effect of reducing torque pulsation and loss in the rotating electric machine by suppressing armature slot harmonics. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6965101 [Patent Document 2] Japanese Patent Application Publication No. 2019-97329 Summary of the Invention [Problem to be solved by the invention]

[0005] On the other hand, when a conventional solid, plate-shaped magnetic wedge with a trapezoidal cross section is fitted into the slot of an armature core, the armature core becomes equivalent in magnetic circuit to a closed-slot shape in which the slot ends are closed. While a closed-slot armature provides better torque than the open-slot armature described above, it still provides lower torque than a semi-open slot in which salient poles (flanges) protruding circumferentially are formed at the tooth ends. Therefore, there is still room for improvement in the torque improvement effect of armature using magnetic wedges.

[0006] The present invention has been made in view of the above circumstances, and provides an armature in which the torque improvement effect due to the magnetic wedge is higher than that of the conventional armature. [Means for solving the problem]

[0007] According to one embodiment, the armature includes an armature core having a yoke, a plurality of teeth each extending radially from the yoke, and slots formed between adjacent teeth, a coil housed in the slot for exciting the armature core, and a magnetic wedge including a magnetic material and positioned radially toward one side of the coil in the slot facing the coil. The magnetic wedge has a first body portion extending in the axial direction of the armature core and in contact with a first surface of the teeth, a second body portion extending in the axial direction of the armature core and in contact with a second surface opposite the first surface of the teeth, and a connecting portion connecting the first body portion and the second body portion in the circumferential direction. A gap extending in the axial direction of the armature core is formed between the first body portion and the second body portion within the slot.

[0008] In one aspect of the above, the coupling portion may be disposed within the slot. The connecting portion may also be disposed at a position protruding from the slot in the axial direction. The magnetic wedge may have a shape in which a first body portion and a second body portion are connected in an annular shape. The connecting portion may be disposed at an axial end of the armature core, and may circumferentially straddle the teeth to connect the first body portion and the second body portion. A rotating electric machine according to another aspect includes the armature according to the above aspect. [Effects of the Invention]

[0009] According to one aspect, it is possible to provide an armature in which the torque improvement effect due to the magnetic wedge is higher than that of a conventional armature. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a view showing a cross section of a rotating electric machine according to a first embodiment. [Figure 2] FIG. 2 is a partially enlarged view of a stator in the rotary electric machine according to the first embodiment. [Figure 3] 3A to 3C are diagrams illustrating an example of the configuration of a magnetic wedge applied in the first embodiment. [Figure 4] FIG. 10 is a partially enlarged view of a stator in a rotary electric machine according to a second embodiment. [Figure 5] 10A and 10B are diagrams illustrating an example of the configuration of a magnetic wedge applied in the second embodiment. [Figure 6] FIG. 10 is a partially enlarged view of a stator in a rotary electric machine according to a third embodiment. [Figure 7] 10A and 10B are diagrams illustrating an example of the configuration of a magnetic wedge applied in the third embodiment. [Figure 8] 10A and 10B are diagrams showing modified shapes of the magnetic wedge. [Figure 9] FIG. 10 is a diagram showing magnetic circuits of Comparative Examples 2 and 3 and an example together with mathematical expressions. [Figure 10] FIG. 10 is a diagram showing calculated values ​​of torque for each torque load ratio in the motors of Comparative Examples 1 to 3 and the example. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiments, in order to make the explanation easier to understand, the structures and elements other than the main parts of the present invention will be explained in a simplified or omitted manner. Furthermore, the same elements will be given the same reference numerals in the drawings. Note that the shapes, dimensions, etc. of the elements shown in the drawings are shown schematically and do not represent the actual shapes, dimensions, etc.

[0012] In the following description, the direction parallel to the extension direction of the rotation axis Ax of the rotating electric machine will be referred to as the "axial direction," the circumferential direction centered on the rotation axis Ax will be simply referred to as the "circumferential direction," and the radial direction centered on the rotation axis Ax will be simply referred to as the "radial direction." Furthermore, in the following description, "extending in the axial direction" includes not only extending strictly in the axial direction but also extending in a direction tilted by less than 45° with respect to the axial direction. Furthermore, "extending in the radial direction" includes not only extending strictly in the radial direction, i.e., extending in a direction perpendicular to the axial direction, but also extending in a direction tilted by less than 45° with respect to the radial direction.

[0013] (First embodiment) Fig. 1 is a diagram showing a cross section in a direction perpendicular to the rotation axis Ax of the rotating electric machine of the first embodiment. Fig. 2 is a partially enlarged view of a stator in the rotating electric machine of the first embodiment. Fig. 3(a) is a front view of a magnetic wedge applied in the first embodiment. Fig. 3(b) is a plan view of the magnetic wedge in an attached state. Fig. 3(c) is a front view of the magnetic wedge in an attached state.

[0014] The rotating electric machine 1 shown in Fig. 1 is an inner rotor type motor, and has a rotor 2 and a cylindrical stator 3 arranged on the outer periphery of the rotor 2. In Fig. 1, the extension direction of the rotation axis Ax of the rotating electric machine 1 is perpendicular to the plane of the page.

[0015] The shaft 4 is fitted into the rotor 2 along the rotation axis Ax, and the rotor 2 is rotatably supported by a bearing (not shown) around the shaft 4. The rotor 2 may be configured as, for example, an embedded magnet rotor, a surface magnet rotor, a squirrel-cage rotor, or a wound rotor. In addition, the stator 3 is arranged concentrically around the outer periphery of the rotor 2 with a small air gap between them.

[0016] The stator 3 is an example of an armature, and houses the rotor 2 in a central space centered on the rotation axis Ax. The stator 3 has a stator core 5, coils 6, and magnetic wedges .

[0017] The stator core 5 is a member formed by laminating multiple metal plates, such as electromagnetic steel plates, in the axial direction, and has a cylindrical yoke portion 5a on the outer periphery and multiple teeth portions 5b that protrude radially inward from the yoke portion 5a. The radially inner side is an example of one radial side.

[0018] The teeth 5b are arranged in a comb-like shape at equal intervals around the yoke 5a in the circumferential direction. In addition, slots 5c for accommodating coils 6 are formed in the stator core 5 between the teeth 5b adjacent to each other in the circumferential direction.

[0019] Furthermore, grooves 5d for engaging magnetic wedges are formed on both side surfaces of the teeth 5b of the stator core 5 near the inner peripheral end facing the rotor 2. Each groove 5d is formed in a position radially inward of the tooth 5b relative to the portion where the coil 6 is housed, and all extend in the axial direction of the stator core 5. In one slot 5c, the grooves 5d formed in adjacent teeth 5b are arranged to face each other.

[0020] The coil 6 is formed by electrically connecting coil segments each formed by winding a rectangular wire in a circular shape, for example. The winding of the coil 6 is not limited to a rectangular wire, and may be a round wire or the like.

[0021] Each coil 6 corresponds to one of the U, V, or W phases of the three-phase AC. The coils 6 for each phase are wound around the teeth 5b with a phase shift in the circumferential direction of the stator 3 to excite the stator core 5, and some of the windings are housed in the slots 5c. For simplicity, the coils 6 are not shown in FIG. 2. The coils 6 provided on the stator 3 may be either concentrated winding or distributed winding.

[0022] In the rotating electric machine 1, the magnetic field of the stator 3 is switched in sequence by controlling the current in the coil 6, which generates an attractive or repulsive force with the magnetic field of the rotor 2. This causes the rotor 2 to rotate around the rotation axis Ax, driving the rotating electric machine 1.

[0023] The magnetic wedges 7 are arranged in each slot 5c of the stator core 5 at a position radially inward of the coils 6, and are components that face the inner peripheral surface of the coils 6 when the coils 6 are attached to the stator 3. For example, the magnetic wedges 7 may be fixed to the stator core 5 by varnish (not shown) when the coils 6 are subjected to a varnish treatment.

[0024] As shown in Figures 3(b) and (c), the magnetic wedge 7 is fitted into the groove 5d of the tooth portion 5b and held in the stator core 5, and serves to prevent the coil 6 from falling off to the inner side of the slot 5c.

[0025] Furthermore, the magnetic wedge 7 contains a magnetic material, which serves to suppress magnetic resistance in the magnetic circuit of the rotating electric machine 1 to improve the torque of the rotating electric machine 1, and to reduce leakage magnetic flux that enters the coil 6 from the rotor 2 to reduce pulsation in the magnetic flux density distribution.

[0026] Any material that can be used for known magnetic wedges can be used as the material for the magnetic wedge 7. For example, the magnetic wedge 7 can be formed by impregnating glass fiber with a magnetic material such as iron powder and epoxy resin. Alternatively, the magnetic material contained in the magnetic wedge 7 can be, for example, flat magnetic metal particles with an amorphous structure that have three-dimensional anisotropy.

[0027] 3(a) and 3(c), the magnetic wedge 7 of the first embodiment is a thin plate-like member formed in an H-shape when viewed from the inner peripheral side of the stator 3. The magnetic wedge 7 has a pair of first and second body portions 11 and 12 extending in the axial direction, and a connecting portion 13.

[0028] The first body portion 11 of the magnetic wedge 7 contacts a first circumferential surface of the tooth portion 5b when attached to the stator 3. The second body portion 11 of the magnetic wedge 7 contacts a second surface of the tooth portion 5b (a surface facing the first surface of the tooth portion 5b within the slot 5c) when attached to the stator 3. In the first embodiment, the tooth portion 5b that the first body portion 11 contacts and the tooth portion 5b that the second body portion 12 contacts are different teeth that are arranged adjacent to each other.

[0029] 2 and 3(c), the axial length of the first body portion 11 and the second body portion 12 is approximately the same as the axial length of the stator core 5. Also, as shown in Fig. 3(b), the thickness of the first body portion 11 and the second body portion 12 (the dimension in the vertical direction in Fig. 3(b)) is a dimension that allows them to fit into the grooves 5d of the teeth portions 5b.

[0030] The connecting portion 13 of the magnetic wedge 7 is formed at the axial middle portion of the first body portion 11 and the second body portion 12, and connects the first body portion 11 and the second body portion 12 in the width direction (the left-right direction in FIGS. 3(a) and 3(c), which corresponds to the circumferential direction of the stator 3). In other words, in the magnetic wedge 7 of the first embodiment, the first body portion 11 and the second body portion 12 are connected by a single connecting portion 13 arranged in the slot 5c.

[0031] Furthermore, in the region of the magnetic wedge 7 in the axial direction excluding the connecting portion 13, a void portion 14 is formed in the magnetic wedge 7, extending axially between the first body portion 11 and the second body portion 12 and penetrating the magnetic wedge 7 in the thickness direction. The axial length of the connecting portion 13 is set to be sufficiently smaller than the axial length of the entire area of ​​the magnetic wedge 7 where the void portion 14 is formed.

[0032] Because air is present in gap 14, the magnetic permeability is much lower than that of first body 11 and second body 12. Therefore, in magnetic wedge 7, gap 14 obstructs the flow of magnetic flux between first body 11 and second body 12.

[0033] In the first embodiment, by applying the magnetic wedges 7 to the slots 5c of the stator core 5, the stator 3 can be manufactured relatively easily by fitting coil segments formed in advance into the slots 5c from the radial direction, thereby reducing the manufacturing cost of the stator 3. Furthermore, in the stator 3 of the first embodiment, the magnetic wedges 7 can prevent the coils 6 from falling off in the radial direction.

[0034] Furthermore, the magnetic wedge 7 in the first embodiment has a first body portion 11 that extends in the axial direction of the stator core 5 and contacts a first surface of the tooth portion 5b, a second body portion 12 that extends in the axial direction of the stator core 5 and contacts a second surface that faces the first surface of the tooth portion 5b, and a connecting portion 13 that connects the first body portion 11 and the second body portion 12 in the circumferential direction. A gap portion 14 that extends in the axial direction of the stator core 5 is formed between the first body portion 11 and the second body portion 12 in the slot 5c. In the stator 3 of the first embodiment, a salient pole is formed in the circumferential direction by the first body portion 11 and the second body portion 12 on the inner circumferential side of the slot 5c, and a gap portion 14 extending in the axial direction is formed between the first body portion 11 and the second body portion 12 of the magnetic wedge 7. As a result, the magnetic circuit of the stator 3 of the first embodiment approaches a semi-open slot shape, and the torque improvement effect of the stator 3 is improved compared to when a magnetic wedge with a conventional closed slot shape is used.

[0035] In the above first embodiment, an example was described in which one connecting portion 13 of the magnetic wedge 7 is provided within the slot 5c, but it is also possible to configure multiple connecting portions 13 to be provided at intervals in the axial direction within the slot 5c.

[0036] (Second embodiment) Next, a configuration example of a stator according to a second embodiment will be described with reference to Figures 4 and 5. The second embodiment is a modification of the first embodiment, in which the magnetic wedge 7A is formed in an annular shape. In the following description of each embodiment, elements common to the first embodiment will be designated by the same reference numerals, and duplicated description will be omitted where appropriate.

[0037] Fig. 4 is a partially enlarged view of a stator in a rotating electric machine according to a second embodiment. Fig. 5(a) is a front view of a magnetic wedge applied in the second embodiment. Fig. 5(b) is a plan view of the magnetic wedge in an attached state. Fig. 5(c) is a cross-sectional view taken along line AA in Fig. 5(a). Fig. 5(d) is a front view of the magnetic wedge in an attached state.

[0038] 5(a) and 5(d), the magnetic wedge 7A of the second embodiment is a thin plate-like member formed into a vertically elongated annular shape when viewed from the front from the inner peripheral side of the stator 3. The magnetic wedge 7A of the second embodiment has a pair of first and second body portions 11 and 12 extending in the axial direction, and a pair of connecting portions 13, 13.

[0039] The first body portion 11 of the magnetic wedge 7A contacts a first circumferential surface of the tooth portion 5b when attached to the stator 3. The second body portion 12 of the magnetic wedge 7A contacts a second surface of the tooth portion 5b when attached to the stator 3. In the second embodiment as well, the tooth portion 5b that the first body portion 11 contacts and the tooth portion 5b that the second body portion 12 contacts are different teeth that are arranged adjacent to each other. The thicknesses of the first body portion 11 and the second body portion 12 (the vertical dimensions in FIGS. 5(b) and 5(c)) are dimensions that allow them to fit into the grooves 5d of the tooth portion 5b.

[0040] The connecting portions 13, 13 in the second embodiment are formed at the axial ends of the first body portion 11 and the second body portion 12, respectively, and connect the first body portion 11 and the second body portion 12 in the width direction. In other words, the magnetic wedge 7A in the second embodiment has the first body portion 11 and the second body portion 12 connected by the connecting portions 13, 13 at two locations, and has an overall ring shape.

[0041] 4 and 5(d), the axial lengths of the first body portion 11 and the second body portion 12 are formed longer than the axial length of the stator core 5 so that the respective connecting portions 13, 13 protrude axially from the stator core 5. As a result, the connecting portions 13, 13 in the second embodiment are each disposed at a position protruding axially from the slot 5c, and connect the first body portion 11 and the second body portion 12 in the width direction outside the stator core 5.

[0042] Furthermore, a gap 14 is formed between the first body portion 11 and the second body portion 12 of the magnetic wedge 7A, extending in the axial direction between the pair of connecting portions 13, 13 and penetrating the magnetic wedge 7A in the thickness direction. Therefore, in the magnetic wedge 7A, the flow of magnetic flux between the first body portion 11 and the second body portion 12 is obstructed by the gap 14.

[0043] In the stator 3 of the second embodiment, as in the first embodiment, the stator 3 can be manufactured relatively easily by fitting a coil 6 formed in advance into a ring shape into the slot 5c from the radial direction, and the magnetic wedge 7A can prevent the coil 6 from falling off in the radial direction.

[0044] Furthermore, in the stator 3 of the second embodiment, similarly to the first embodiment, a salient pole is formed in the circumferential direction by the first body portion 11 and the second body portion 12 on the inner circumferential side of the slot 5c, and a gap portion 14 extending in the axial direction is formed between the first body portion 11 and the second body portion 12 of the magnetic wedge 7A. As a result, the magnetic circuit of the stator 3 in the second embodiment approaches a semi-open slot shape, and the torque improvement effect of the stator 3 is improved compared to when a magnetic wedge with a conventional closed slot shape is used.

[0045] Furthermore, in the stator 3 of the second embodiment, the connecting portions 13, 13 connecting the first body portion 11 and the second body portion 12 are not present inside the slots. Therefore, in the second embodiment, the influence of the connecting portions 13 on the magnetic circuit is smaller than in the first embodiment, and the torque improvement effect of the stator 3 is further improved.

[0046] (Third embodiment) Next, a configuration example of a stator according to a third embodiment will be described with reference to Figures 6 and 7. The third embodiment is a modification of the first embodiment, in which the magnetic wedges 7B are formed in a C-shape.

[0047] Fig. 6 is a partially enlarged view of a stator in a rotating electric machine according to the third embodiment. Fig. 7(a) is a front view of a magnetic wedge applied in the third embodiment. Fig. 7(b) is a front view of the magnetic wedge in an attached state.

[0048] 7(a) and 7(b), the magnetic wedge 7B of the third embodiment is a thin plate-like member having a C-shaped front view when viewed from the inner peripheral side of the stator 3. The magnetic wedge 7B of the third embodiment has a pair of axially extending main body portion 11 and second main body portion 12, and a connecting portion 13.

[0049] The first body portion 11 of the magnetic wedge 7B contacts a first circumferential surface of the tooth portion 5b when attached to the stator 3. The second body portion 12 of the magnetic wedge 7B contacts a second surface of the tooth portion 5b when attached to the stator 3. The axial lengths of the first body portion 11 and the second body portion 12 are longer than the axial length of the stator core 5 so that the connecting portion 13 protrudes from the stator core in the axial direction. As with the first and second embodiments, the thicknesses of the first body portion 11 and the second body portion 12 are sized to allow them to fit into the grooves 5d of the tooth portion 5b.

[0050] The connecting portion 13 in the third embodiment is formed at one axial end (upper side in the figure) of the first body portion 11 and the second body portion 12, and connects the first body portion 11 and the second body portion 12 in the width direction. The connecting portion 13 of the magnetic wedge 7B in the third embodiment straddles the tooth portion 5b in the circumferential direction when attached to the stator 3, connecting the first body portion 11 and the second body portion 12.

[0051] 6 and 7, in the third embodiment, the tooth 5b that the first body 11 contacts and the tooth 5b that the second body 12 contacts are the same tooth. That is, in the slot 5c formed between the adjacent first tooth 5b and second tooth 5b, the first body 11 of the first magnetic wedge 7B attached to the first tooth 5b and the second body 12 of the second magnetic wedge 7B attached to the second tooth 5b are arranged opposite to each other.

[0052] A gap 14 extending in the axial direction is formed between the first body portion 11 of the first magnetic wedge 7B and the second body portion 12 of the second magnetic wedge 7B. Therefore, the flow of magnetic flux between the first body portion 11 of the first magnetic wedge 7B and the second body portion 12 of the second magnetic wedge 7B within the slot 5c is obstructed by the gap 14.

[0053] In the stator 3 of the third embodiment, as in the first and second embodiments, the stator 3 can be manufactured relatively easily by fitting a coil 6 formed in advance into a ring shape into the slot 5c from the radial direction, and the magnetic wedge 7B can prevent the coil 6 from falling off in the radial direction.

[0054] Furthermore, in the stator 3 of the third embodiment, similarly to the first and second embodiments, salient poles are formed in the circumferential direction by the first body portion 11 and the second body portion 12 on the inner circumferential side of the slot 5c, and a gap portion 14 extending in the axial direction is formed between the first body portion 11 and the second body portion 12 in one slot 5c. As a result, the magnetic circuit of the stator 5 in the third embodiment approaches a semi-open slot shape, and the torque improvement effect of the stator 3 is enhanced compared to when a magnetic wedge is applied, which results in a conventional closed slot shape.

[0055] Furthermore, in the stator 3 of the third embodiment, the connecting portions 13 are arranged across the teeth 5b at the axial end portions of the stator core 5. Therefore, in the stator 3 of the third embodiment, the connecting portions 13 are not present inside the slots, and therefore the effect of the connecting portions 13 on the magnetic circuit is smaller than in the first embodiment, further improving the torque improvement effect of the stator 3.

[0056] (Modification of magnetic wedge) Fig. 8(a) is a diagram showing a magnetic wedge 7C of a first modified example. The magnetic wedge 7C of Fig. 8(a) has an overall C-shape, and is configured such that a first main body portion 11 and a second main body portion 12 are connected by a connecting portion 13 provided at the axial end portion.

[0057] In the first modified example shown in Fig. 8(a), the teeth 5b that the first body portion 11 contacts and the teeth 5b that the second body portion 12 contacts are different teeth that are arranged adjacent to each other. Also, the connecting portion 13 in Fig. 8(a) is arranged at a position that protrudes axially from the slot 5c, and connects the first body portion 11 and the second body portion 12 outside the stator core 4. As a result, in the magnetic wedge 7C in Fig. 8(a), the first body portion 11 and the second body portion 12 form a salient pole in the circumferential direction on the inner periphery side of the slot 5c, and a gap 14 that extends axially is formed between the first body portion 11 and the second body portion 12 of the magnetic wedge 7C.

[0058] Even in the first variant of Figure 8(a), the magnetic circuit of the stator 3 to which the magnetic wedge 7C is applied approaches a semi-open slot shape, thereby improving the torque improvement effect of the stator 3 compared to when a magnetic wedge with a conventional closed slot shape is applied.

[0059] Fig. 8(b) is a perspective view showing a magnetic wedge 7D of a second modified example. The magnetic wedge 7D of Fig. 8(b) has a groove 15 formed in the center of the magnetic wedge 7D, extending in the axial direction.

[0060] Although not shown, magnetic wedge 7D in Fig. 8(b) has both ends in the width direction fitted into different teeth 5b. In magnetic wedge 7D in Fig. 8(b), the portions on both sides in the width direction separated by groove 15 correspond to first main body 11 and second main body 12, respectively, the bottom of groove 15 corresponds to connecting portion 13, and the space portion of groove 15 extending in the axial direction corresponds to gap 14.

[0061] In the second modified example of Fig. 8(b), the magnetic wedges are connected in the width direction, but the flow of magnetic flux in the width direction is obstructed by gaps in the magnetic wedge grooves 15. As a result, the magnetic circuit of the stator 3 to which the magnetic wedges 7D of Fig. 8(b) are applied approaches a semi-open slot shape compared to the case of a magnetic wedge that does not form grooves 15, and the torque improvement effect of the stator 3 is enhanced.

[0062] Furthermore, although not shown, as another modified example, the extension direction of the gaps 14 of each magnetic wedge may be tilted relative to the axial direction so that the gaps 14 are arranged in a skewed manner.

[0063] (Example) In the examples, the torque of each of the following motors was calculated by simulation: a motor with a semi-open slot stator (Comparative Example 1), a motor with an open slot stator using a resin wedge (Comparative Example 2), a motor with a closed slot stator using a magnetic wedge of a conventional shape (Comparative Example 3), and a motor with a stator using the magnetic wedge of the first embodiment (Example).

[0064] Here, Fig. 9(a) shows the magnetic circuit corresponding to the motor of Comparative Example 2, together with the mathematical expressions. Fig. 9(b) shows the magnetic circuit corresponding to the motor of Comparative Example 3, together with the mathematical expressions. Fig. 9(c) shows the magnetic circuit corresponding to the motor of the example, together with the mathematical expressions. The magnetic circuits in Figs. 9(a) to 9(c) have been appropriately simplified to the extent that it does not hinder the explanation of the principle.

[0065] In addition, in Fig. 9(a) to (c), NI indicates the magnetomotive force of the stator, and R st denotes the magnetic resistance of the stator, and R gap indicates the magnetic resistance of the gap, and R rt denotes the magnetic resistance of the rotor. leak indicates the leakage flux between the teeth, and φ gap indicates the magnetic flux in the gap, and φ st denotes the stator magnetic flux.

[0066] The motor torque is the magnetic flux φ gap As shown in the formulas in Figures 9(a) and 9(b), the gap magnetic flux (φ' gap ) is compared with Comparative Example 2 (open slot), the magnetic permeability near the gap increases due to the effect of the magnetic wedge, and the magnetic resistance of the gap (R' gap ) decreases, but (1+R st / R' gap ) is multiplied by the denominator.

[0067] On the other hand, as shown in the formulas in Figures 9(b) and (c), in the case of the example, the denominator of the magnetic circuit is (1 + R st / R' gap ) and the effect of the magnetic wedge reduces the magnetic resistance (R'') of the gap. gap Therefore, according to the configuration of the embodiment, an increase in the magnetic flux in the gap portion can be expected. In the configuration of the embodiment, for example, the magnetomotive force NI of the stator is small, and R st However, when NI is large, the effect is small due to the decrease in permeability caused by magnetic saturation. st In the case of high load operation where the value of the saturation voltage is relatively large, it is expected that the effect of the configuration of the embodiment will be greater.

[0068] 10 shows the calculated torque values ​​for the motors of Comparative Examples 1 to 3 and the Example at torque load rates of 20%, 40%, 60%, 80%, and 100%. In Fig. 10, the calculated torque values ​​of the motors for each torque load rate are normalized by the calculated value of Comparative Example 1.

[0069] 10, under each condition of torque load rate, the torque of the motor of the example is smaller than the torque of the motor of comparative example 1 (semi-open slot), but is larger than the torque of the motors of comparative examples 2 and 3. Therefore, it can be seen that the configuration of the example has a greater effect of improving torque compared to a conventional magnetic wedge such as comparative example 3, and the torque approaches that of the motor of comparative example 1 (semi-open slot).

[0070] The present invention is not limited to the above-described embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.

[0071] For example, in the above embodiment, the rotating electrical machine 1 is a motor, but the rotating electrical machine 1 may be a generator.

[0072] For example, in the above embodiment, an example has been described in which the armature to which the magnetic wedge is applied is the stator 3, but the armature to which the magnetic wedge is applied may also be a wound rotor having a coil.

[0073] Furthermore, in the above embodiment, a configuration example in which one magnetic wedge is fitted in the axial direction of the armature has been described, but a configuration in which a plurality of magnetic wedges are fitted in the axial direction of the armature may also be used.

[0074] Furthermore, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0075] DESCRIPTION OF SYMBOLS 1... rotating electric machine, 2... rotor, 3... stator, 4... shaft, 5... stator core, 5a... yoke portion, 5b... teeth portion, 5c... slot, 5d... groove, 6... coil, 7, 7A, 7B, 7C, 7D... magnetic wedge, 11... first main body portion, 12... second main body portion, 13... connecting portion, 14... gap portion, 15... groove

Claims

1. an armature core having a yoke portion, a plurality of teeth portions each protruding and extending radially from the yoke portion to one side, and slots formed between adjacent teeth portions; a coil housed in the slot and exciting the armature core; a magnetic wedge including a magnetic material and disposed on one radial side of the coil in the slot and facing the coil, The magnetic wedge is a first main body portion extending in the axial direction of the armature core and in contact with a first surface of the tooth portion; a second body portion extending in the axial direction of the armature core and in contact with a second surface of the tooth portion opposite to the first surface; a connecting portion that connects the first main body portion and the second main body portion in a circumferential direction, A gap extending in the axial direction of the armature core is formed between the first body portion and the second body portion within the slot. Armature.

2. The coupling portion is disposed within the slot. The armature according to claim 1 .

3. The connecting portion is disposed at a position protruding from the slot in the axial direction. The armature according to claim 1 .

4. The magnetic wedge has a shape in which the first body portion and the second body portion are connected in an annular shape.

4. The armature according to claim 3.

5. The connecting portion is disposed at an axial end of the armature core, and connects the first body portion and the second body portion across the teeth in the circumferential direction.

4. The armature according to claim 3.

6. A rotating electric machine comprising the armature according to any one of claims 1 to 5.

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