Stator and motor including the stator

Abstract

A stator (10) according to the present invention comprises: a yoke part (11) composed of a plurality of block bodies having an arc shape with a rectangular cross section; fixing members (12, 13) for disposing and fixing the plurality of block bodies in an annular shape; a plurality of teeth parts (14) erected on the peripheral surface of the yoke part; and a coil (15) wound around the plurality of teeth parts (14).

Description

Technical Field

[0001] The present invention relates to a stator for a motor and a motor including the stator.

Background Art

[0002] Conventionally, as in the motor system for an automobile disclosed in Patent Document 1, an outer rotor type motor has been added between an engine and drive wheels to assist engine torque at the time of starting the automobile with this motor. Further, in a conventional stator for a motor, as disclosed in Patent Document 2 for example, a plurality of concave portions for engaging with tooth portions are formed on an outer peripheral surface of an annular yoke portion, and a fitting portion for engaging with the shape of the concave portion formed on the yoke portion is formed at the tip of each tooth portion, and by fitting the fitting portion of the tooth portion into the concave portion of the yoke portion, a plurality of tooth portions are erected on the yoke portion. Further, when the yoke portion and the tooth portion are configured separately, when assembling the stator as in the stator disclosed in Patent Document 2, instead of winding a coil around the plurality of tooth portions after erecting the tooth portions on the yoke portion, Yoke part by winding a coil around the plurality of tooth portions before fitting them, and erecting the tooth portions on the yoke portion in that state, the work of winding the coil around the tooth portions can be facilitated.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in Patent Document 2, the shape of the yoke portion of the stator is annular. When manufacturing the yoke portion by processing an electromagnetic steel material, the region inside the inner peripheral edge of the annular yoke portion in the electromagnetic steel material becomes unnecessary, resulting in a problem that the yield in manufacturing the stator decreases.

[0005] The present invention has been made in view of such problems, and an object thereof is to provide a stator capable of improving the manufacturing yield and a motor including this stator.

Means for Solving the Problems

[0006] To solve the above problems, the stator according to the present invention includes a yoke portion composed of a plurality of block bodies (for example, divided yokes 110, 110a', 110b', 110c' in the embodiment) having an arc shape with a rectangular cross section, a fixing member (for example, brackets 12 and ring plates 13 in the embodiment) for arranging and fixing the plurality of block bodies in an annular shape, a plurality of teeth portions (for example, teeth 14 in the embodiment) erected on the circumferential surface of the yoke portion, and a coil (for example, coil 15 in the embodiment) wound around the plurality of teeth portions. An engaging convex portion is formed at the tip of the teeth portion, a plurality of engaging concave portions that engage one-to-one with the engaging convex portion are formed on the circumferential surface of the block body, and the plurality of teeth portions are erected on the yoke portion by engaging the engaging convex portion with the engaging concave portion. And each of the plurality of tooth parts has a shape dimension such that when the plurality of block bodies are arranged in an annular shape with the tooth parts standing on each of the plurality of block bodies and fixed by the fixing member, the adjacent tooth parts abut against each other over the entire circumference. Each of the plurality of block bodies has a shape dimension such that when the plurality of block bodies are arranged in an annular shape with the tooth parts standing on each of the plurality of block bodies and fixed by the fixing member, a gap (for example, the gap GP in the embodiment) is formed between adjacent block bodies 。

[0007] Further, in the stator according to the present invention, the fixing member includes an annular first fixing member (for example, ring plate 13 in the embodiment) disposed on one plane of the yoke portion and an annular second fixing member (for example, bracket 12 in the embodiment) disposed on the other plane of the yoke portion. The widths (for example, widths Wr, Wb in the embodiment) in the radial direction of the first fixing member and the second fixing member are such that when fixing the plurality of block bodies in an annular shape, the yoke portion Engaging convex part and the teeth portion Engaging concave partIt is preferable to have a length that can cover the engaging portion with [object].

[0009] Also, in the stator according to the present invention, engaging portions (for example, engaging concave portions 116 and engaging convex portions 140 in the embodiment) that engage with each other are formed on the circumferential surface of the yoke portion and the tip of the tooth portion, and the plurality of block bodies are screwed to the second fixing member by screws via the first fixing member, and screw holes (for example, yoke fixing screw holes 112, 122, 132 in the embodiment) for screwing are preferably provided at positions corresponding to the engaging portions.

[0010] Furthermore, a motor may be configured by the stator according to the present invention and a rotor (for example, rotor 20 in the embodiment) that rotates by a rotating magnetic field generated by this stator.

Advantages of the Invention

[0011] In the stator according to the present invention, since the yoke portion constituting the stator is composed of a plurality of block bodies having an arc shape with a rectangular cross section, many members can be obtained from the electromagnetic steel sheet that is the material of the yoke portion as compared with the conventional case, so the manufacturing yield can be improved.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0013] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, the schematic configuration of a motor including the stator according to this embodiment will be described with reference to FIG. 1. The motor 1 shown in FIG. 1 is an outer rotor type three-phase synchronous motor used to assist torque when starting a vehicle engine, for example. The motor 1 mainly includes a stator 10 and a rotor 20. The stator 10 generates a rotating magnetic field to rotate the rotor 20, and the rotor 20 rotates by the rotating magnetic field generated by the stator 10 and transmits the rotational force to the vehicle engine.

[0014] The rotor 20 includes a rotor frame 22 having a substantially L-shaped cross-section and a plurality of permanent magnets 24 fixed along the inner peripheral surface of the rotor frame 22. Three screw holes 220a are provided at predetermined angular intervals on the flat portion of the rotor frame 22, and three screw holes 220b are provided at positions point-symmetrical to the screw holes 220a with the center (rotation axis) of the rotor 20 as the symmetry point. In addition, three screw holes 220c and 220d are also provided at positions shifted 90° in the circumferential direction from the positions of the screw holes 220a and 220b. The rotor 20 is screwed to a flywheel (not shown) of the vehicle engine through these screw holes.

[0015] The stator 10 has a yoke 11, a bracket 12, a ring plate 13, a plurality of teeth 14, a coil 15, a resolver stator 16, and an insulator 17. The yoke 11 is a metal member in the shape of a substantially annular body with a rectangular cross-section, and a plurality of teeth 14 (to be described later) are erected on its side surface (circumferential surface). The bracket 12 is an annular metal member for fixing the yoke 11 together with the ring plate 13 in a sandwiching manner. A step BP (see Fig. 2(b)), which serves as a positioning portion for the yoke 11 when assembling the stator 10, is formed on the inner peripheral edge of the bracket 12. Further, the bracket 12 can be screwed to a vehicle engine (more specifically, a flywheel housing), whereby the stator 10 can be fixed to the vehicle engine, and the heat generated by the yoke 11 and the coil 15 can be dissipated to the vehicle side.

[0016] The ring plate 13 is a flat and continuous annular metal member, and as described above, it fixes the yoke 11 to the bracket 12. The teeth 14 are metal members for winding a conducting wire to form the coil 15, and a plurality of teeth 14 (36 in this embodiment) are erected on the circumferential surface of the yoke 11. Each coil 15 is divided into three phases and connected to each other, and driving power is supplied to the coils 15 of each phase via bus bars 18a, 18b, 18c. The resolver stator 16 is an annular member fixed to the inner peripheral side of the bracket 12, and outputs a voltage corresponding to the rotation angle of a crankshaft (not shown) to which the rotor 20 is fixed to a drive control unit (not shown) of the motor.

[0017] The insulator 17 is a resin member provided corresponding to each tooth 14, and protects the surface of the conducting wire by covering the portion where the conducting wire is wound around the corresponding tooth 14. That is, if the conducting wire is directly wound around the tooth 14, there is a risk of damaging the coating applied to the surface of the conducting wire by the edge portion of the tooth 14, and thus it is provided to avoid this.

[0018] Next, the configuration of the stator 10 will be described with reference to FIG. 2. FIG. 2 is a view showing the appearance of the stator 10. FIG. 2(a) is a front view when the stator 10 is viewed from the rotor 20 shown in FIG. 1, FIG. 2(b) is a side view when the stator 10 is viewed from the right side of the paper surface of FIG. 2(a), and FIG. 2(c) is a rear view of the stator 10. In FIGS. 2(a) and 2(c), the direction along the outer periphery of the stator 10 (see arrow C) is the circumferential direction, the direction extending radially from the center point O of the stator 10 indicated by arrow R (see arrow R) is the radial direction, and in FIG. 2(b), the horizontal direction of the paper surface (see arrow A) is the axial direction.

[0019] Also, in the axial direction shown in FIG. 2(b), the left direction is defined as "front" and the right direction is defined as "rear". Therefore, it can also be said that FIG. 2(a) shows the front surface of the stator 10 and FIG. 2(c) shows the rear surface of the stator 10. Further, in FIG. 2(a), a part of the ring plate 13 is shown in a broken state, and in FIG. 2(c), a part of the bracket 12 is shown in a broken state. In FIG. 2, the same components as those in FIG. 1 are denoted by the same reference numerals as in FIG. 1, and detailed descriptions thereof are omitted.

[0020] As shown in FIG. 2(a), 36 teeth 14 are erected on the outer peripheral surface of the yoke 11 at equal angular intervals, and conductors are wound around each tooth 14 to form coils 15. These coils 15 are connected to each other for each phase by bus rings 182 and are connected to the corresponding phase bus bars. In FIG. 2(c), only the bus ring corresponding to one phase is denoted by reference numeral 182, and the assignment of reference numerals to the bus rings corresponding to the other two phases is omitted.

[0021] Engaging portions having complementary shapes are formed on the yoke 11 and each tooth 14, and the teeth 14 are erected on the yoke 11 by engaging the engaging portions with each other. This engaging portion corresponds to an anti-rotation groove (engaging recess 116 described later) formed on the outer peripheral surface in the yoke 11, as shown in the broken portion of the ring plate 13 in FIG. 2(a), and in the tooth 14, it corresponds to a protrusion (engaging convex portion 140 described later) formed at the tip and engaging with the above-described anti-rotation groove.

[0022] As shown in FIG. 2(a), the width Wr of the ring plate 13 has a length that reaches not only the yoke 11 but also the engaging portion between the yoke 11 and the teeth 14 when the yoke 11 is screwed to the bracket 12. Further, as shown in FIG. 2(b), in the bracket 12, the width Wb in the radial direction of the portion that abuts on the yoke 11 has a length that reaches the engaging portion between the yoke 11 and the teeth 14 when the yoke 11 is screwed using the ring plate 13. In this way, by pressing the engaging portion between the yoke 11 and the teeth 14 with the ring plate 13 and the bracket 12, it is possible to prevent the teeth 14 from shifting axially with respect to the yoke 11.

[0023] As shown in FIG. 2(b), the yoke 11 is disposed between the ring plate 13 and the bracket 12 and is screwed to the bracket 12 by the screw SC shown in FIG. 1. Eight screw holes for fixing the yoke 11 to the bracket 12 are provided in the ring plate 13, the yoke 11, and the bracket 12, respectively, as screw holes for fixing the yoke. Here, the screw hole for fixing the yoke of the ring plate 13 is denoted by reference numeral 132 (see FIG. 2(a)), the screw hole for fixing the yoke of the yoke 11 is denoted by reference numeral 112 (see the broken portion of the ring plate 13 in FIG. 2(a)), and the screw hole for fixing the yoke of the bracket 12 is denoted by reference numeral 122 (see FIG. 2(c)). Note that female threads that are screwed with the screw SC are cut in the screw holes for fixing the yoke in the bracket 12, and the screw holes for fixing the yoke in the ring plate 13 and the yoke 11 are through holes without female threads cut.

[0024] Also, as described above, the stator 10 shown in FIG. 2 is screwed to the flywheel housing (not shown) of the vehicle engine. As screw holes for this screwing, eight stator fixing screw holes are provided in the ring plate 13, the yoke 11, and the bracket 12, respectively. Here, the stator fixing screw holes of the ring plate 13 are denoted by reference numeral 134 (see FIG. 2(a)), the stator fixing screw holes of the yoke 11 are denoted by reference numeral 114 (see FIG. 3(a)), and the stator fixing screw holes of the bracket 12 are denoted by reference numeral 124 (see FIG. 2(c)). Note that the stator fixing screw holes in the ring plate 13, the yoke 11, and the bracket 12 are all through holes without threads.

[0025] The yoke 11 of the present embodiment is composed of four split yokes arranged in a circular shape when viewed from the front. Here, the shape of the split yoke 110 constituting the yoke 11 will be described with reference to FIG. 3. In FIG. 3, FIG. 3(a) is a front view of the split yoke 110, and FIG. 3(b) is a side view of the split yoke 110 when viewed from arrow A in FIG. 3(a). As shown in FIG. 3(a), one split yoke is an arc-shaped block body having an angle of 90°, and is formed by laminating a large number (for example, about 100 sheets) of electromagnetic steel sheets (yoke members) having the same shape (see the end face EF in FIG. 3(b)).

[0026] Here, when the yoke is formed in an annular shape as in the prior art, the inner peripheral portion of the yoke becomes unnecessary, so the number of yoke members obtained from one electromagnetic steel sheet decreases. Therefore, when considering laminating a large number of electromagnetic steel sheets to form a yoke, it is easily imaginable that the yield deteriorates in manufacturing one yoke. On the other hand, since the yoke 11 of the present embodiment is composed of a plurality of divided block bodies (that is, split yokes 110), the number of yoke members obtained from one electromagnetic steel sheet can be increased, and the yield can be significantly improved compared to the prior art.

[0027] As shown in FIG. 3(a), nine engaging recesses 116 having an arris groove shape are formed on the outer peripheral surface of the split yoke 110. Among these, the two engaging recesses 116 closest to both end faces of the split yoke 110 are formed at positions 5° in the circumferential direction from each end face, and seven engaging recesses 116 are formed between these two engaging recesses 116 at an angular interval of 10°. Note that, as described above, an engaging convex portion 140 that engages with the engaging recess 116 is formed at the tip of the tooth 14. Also, the shape dimensions of the tooth 14 are determined such that when the engaging convex portions 140 of the teeth 14 are engaged with adjacent engaging recesses 116, the opposing contact surfaces CF of the adjacent teeth 14 come into contact with each other.

[0028] Further, when the four split yokes 110 are arranged in an annular shape with the teeth 14 engaged with the split yokes 110, for example, as shown in FIG. 4, when the contact surfaces CF (not shown) of the adjacent teeth 14a and 14b come into contact with each other, the dimensions of the split yoke 110 are determined such that a gap GP is generated between the end face EF of the split yoke 110a and the end face EF of the split yoke 110b. In other words, it can be said that when the engaging convex portion 140 of the tooth 14 is engaged with the engaging recess 116 closest to the end face EF of the split yoke 110, the end face EF of the split yoke 110 is recessed in the circumferential direction compared to the contact surface CF of the tooth 14.

[0029] Here, when the shape dimensions are determined such that the end face EF of the split yoke 110 and the contact face CF of the tooth 14 are in the same plane, for example, due to manufacturing errors or the like, it is assumed that the end face EF of the split yoke 110 protrudes in the circumferential direction more than the contact face CF of the tooth 14. In this state, when the split yokes 110 engaged with the teeth 14 are arranged in a circle, the end faces EF of the opposing split yokes 110 come into contact with each other, but there is a possibility that a gap may be formed between the contact faces CF of the opposing teeth 14. Such a state is not preferable in terms of the performance of the motor because the magnetic resistance is larger than the case where the contact faces CF of the teeth 14 are in contact with each other and there is a gap between the end faces EF of the split yokes 110. Therefore, when the split yokes 110 to which the teeth 14 are attached are arranged in a circle, a gap GP is formed between the end faces EF of the split yokes 110 so that the contact faces CF of the adjacent teeth 14 surely come into contact with each other.

[0030] Thus, in the yoke 11 composed of a plurality of split yokes 110, consider a case where the split yokes 110 are screwed to the bracket 12 with screws SC without using the ring plate 13 described above, or a case where the split yokes 110 are screwed to the bracket 12 via a plurality of arc-shaped flat plates instead of the ring plate 13. In the present embodiment, the teeth 14 are attracted to the outer peripheral side by the attracting force of the permanent magnet 24 of the rotor frame 22. However, as described above, when there is no ring plate 13 or when a non-continuous plate is used, the split yoke 110 and the teeth 14 will tilt with the screw SC with respect to the rotation axis of the rotor frame 22 with the screwing portion between the screw SC and the bracket 12 as a fulcrum. Due to this tilt, the gap on the opposing surface between the teeth 14 and the permanent magnet 24 in the rotation axis direction of the rotor frame 22 will not be constant. On the other hand, in the present embodiment, since the ring plate 13 is a continuous annular shape, even if the teeth 14 are attracted to the permanent magnet 24 of the rotor frame 22, the tilt of the screw SC is suppressed. As a result, it is possible to effectively suppress the tip of the teeth 14 (the end on the permanent magnet 24 side) from tilting toward the bracket 12 side in the rotation axis direction of the rotor frame 22 according to the tilt of the screw SC, and the gap on the opposing surface between the teeth 14 and the permanent magnet 24 can be made more constant.

[0031] Returning to FIG. 3(a), yoke fixing screw holes 112 are provided at positions at an angle of 15° in the circumferential direction from both end faces of the split yoke 110. And between the two yoke fixing screw holes 112, two stator fixing screw holes 114 are provided at an angular interval of 20° in the circumferential direction so as to be equidistant from each other's screw holes. Thereby, the positions of the yoke fixing screw holes 112 and the stator fixing screw holes 114 are determined to correspond to the formation positions of the engagement recesses 116, respectively. This is because when the motor of the present embodiment is driving, magnetic flux lines ML as shown by the arrows in FIG. 5 are generated, and the area directly below the teeth 14 does not become a magnetic path. By providing the screw holes in accordance with the formation positions of the engagement recesses 116, the magnetic resistance due to the screw holes is reduced.

[0032] Next, the relationship between the number of divisions of the yoke 11 and the number of various screws will be described with reference to Table 1. Here, the number of screws required to fix the split yoke to the bracket is two per split yoke, and the number of screws required to attach one stator to the vehicle engine is eight. Also, in Table 1, the yoke with a division number of 0 means the conventional annular rotor, and the yield (reduction area ratio) when the division numbers are 2, 4, and 8 is based on the division number of 0.

Table 1

[0033] As shown in Table 1, when the division number is 2, the improvement in yield is inferior compared to when the division numbers are 4 or 8. Also, when the division number is 8, although the improvement in yield is not much better compared to when the division number is 4, the number of yoke fixing screws required becomes twice as many, i.e., 16. For this reason, in this embodiment, the division number of the yoke 11 is set to 4.

[0034] Next, a part of the assembly work of the stator 10 in this embodiment will be described with reference to FIGS. 6 and 7. As shown in FIG. 6, the assembly of the stator 10 in this embodiment is as follows: First, the insulator 17 is attached to each tooth 14, and the conductor is wound thereon to form the coil 15. Then, in one split yoke 110, starting from the engaging recess 116 in the front in FIG. 6, the engaging convex portion 140 of the tooth 14 on which the coil 15 is formed is engaged in order. The reason for assembling the teeth 14 to the split yoke 110 in such an order lies in the shape of the engaging portions of the adjacent insulators 17.

[0035] In this embodiment, as shown in FIG. 7, in the insulator 17, the shape of the portion (engagement portion ST) that engages with the adjacent insulator 17 has a crank-shaped step formed therein. In order to match the shape of this step with the shape of the step in the adjacent insulator 17, in the state shown in FIG. 7, it is necessary to assemble the teeth 14 to the split yoke 110 in order from the left side in the figure.

[0036] Then, with nine teeth 14 each formed with a coil 15 attached to each split yoke 110, first, two split yokes 110 are combined in pairs to assemble two sets of half-circumference yokes. Next, the two sets of half-circumference yokes (hereinafter also referred to as "half yokes") are each assembled to the bracket 12. Specifically, the two sets of half yokes are each pushed in from the outer peripheral side of the bracket 12 toward the center, and the inner peripheral surfaces of the half yokes are brought into contact with the step BP (see FIG. 2(b)) of the bracket 12, so that the two sets of half yokes can be arranged in an annular shape. At this time, the contact surfaces CF of the teeth 14 located at both ends of one half yoke are surely in contact with the contact surfaces CF of the teeth 14 located at both ends of the other half yoke. Also, the positions of the yoke fixing screw holes 112 provided in each of the annularly arranged half yokes and the positions of the yoke fixing screw holes 122 provided in the bracket 12 coincide in the radial direction.

[0037] That is, the step BP of the bracket 12 is formed at a position such that when the inner peripheral surface of each half yoke comes into contact with the step BP of the bracket 12, the contact surfaces CF of the teeth 14 located at both ends of one half yoke are surely in contact with the contact surfaces CF of the teeth 14 located at both ends of the other half yoke. In addition, the step BP of the bracket 12 is formed at a position such that when the inner peripheral surface of each half yoke comes into contact with the step BP of the bracket 12, the positions of the yoke fixing screw holes 112 provided in each half yoke and the positions of the yoke fixing screw holes 122 provided in the bracket 12 do not shift in the radial direction.

[0038] Here, in the case of an annular yoke as in the prior art, it was not possible to incorporate teeth one by one into the yoke. That is, even if the teeth were assembled one by one in order to the yoke, due to the shape of the engaging portion ST of the insulator 17, the last one could not be assembled. Therefore, first, the 36 teeth 14 in which the coil 15 is formed are circularly arranged over the entire circumference, and finally, the annular yoke needs to be assembled to the teeth 14 arranged in a circle. In this case, since the 36 engaging recesses formed in the yoke have to be engaged one by one while aligning with the positions of the engaging protrusions formed in each tooth 14, the assembly work requires a great deal of time.

[0039] On the other hand, the yoke 11 of the present embodiment can be assembled into a yoke 11 extending over the entire circumference by combining the split yokes 110 in a state where the teeth 14 are assembled, so that the time for the assembly work can be significantly shortened.

[0040] In addition, an annular yoke as in the prior art is heavy in its own weight. Therefore, when fixing the electromagnetic steel sheets laminated by V caulking, when assembling the yoke to the bracket, distortion is caused by its own weight or the electromagnetic steel sheets are peeled off. However, when the yoke 11 is configured by the split yokes 110 as in the present embodiment, the self-weight of each split yoke 110 becomes lighter, so such a risk is eliminated.

[0041] Note that the end face EF of the split yoke 110 shown in Fig. 3(b) was a plane parallel to the radial direction of the stator 10 as shown in Fig. 3(a). However, for example, as shown in Fig. 8(a), it may be a plane having a "く" shape when viewed from the front. When such an end face is used, at the location CZ where the adjacent split yokes 110a' and 110b', and 110b' and 110c' face each other, since the opposing faces of both are angled with respect to the radial direction, the air gap between the two can be reduced, and the efficiency of the motor can be improved. For example, as shown in Fig. 8(b), assume that the end face EFa of the split yoke 110a' and the end face EFb of the split yoke 110b' are parallel, and the angle formed by the end face EFa of the split yoke 110a' and the line OE connecting the center point O of the stator 10 and the end E of the split yoke 110a' is θ. Also, at the end E, let the distance between the split yokes 110a' and 110b' on the line orthogonal to the line OE be GP. At this time, the air gap between the split yokes 110a' and 110b' is GP·sinθ, and it can be made shorter than the distance GP.

[0042] In the above embodiment, the split yoke 110 was screwed to the bracket 12 with the screw SC via the ring plate 13. However, the ring plate 13 may be omitted, and the split yoke 110 may be screwed to the bracket 12. Also, instead of the continuous annular ring plate 13, for example, a plurality of arc-shaped flat plates may be arranged in an annular shape, and the split yoke 110 may be screwed to the bracket 12 via these flat plates. Also, although the case where the stator according to the present invention is applied to an outer rotor type motor has been exemplified and described, it is not limited to this configuration. For example, a plurality of teeth may be erected on the inner peripheral side of the split yoke, and it may also be applied to an inner rotor type motor having a rotor inside the stator. Further, the stator according to the present invention is not limited to a motor, and can also be applied to, for example, an electromagnetic retarder used as an auxiliary brake for a large vehicle.

Explanation of Reference Numerals

[0043] 10 Stator 11 Yoke 12 Bracket 13 Ring plate 14 Teeth 15 Coil 16 Resolver stator 17 Insulator 18a, 18b, 18c Bus bar 20 Rotor 22 Rotor frame 24 Permanent magnet 110, 110a’, 110b’, 110c’ Split yoke 112, 122, 132 Yoke fixing screw holes 114, 124, 134 Stator fixing screw holes 116 Engagement recess 140 Engagement protrusion 182 Bus ring 220a, 220b, 220c Rotor fixing screw hole

Claims

1. A yoke portion composed of a plurality of block bodies having an arc shape with a rectangular cross-section, A fixing member for arranging and fixing the plurality of block bodies in an annular shape, A plurality of teeth portions erected on the circumferential surface of the yoke portion, A coil wound around the plurality of teeth portions, and comprising: An engaging convex portion is formed at the tip of the teeth portion, A plurality of engaging concave portions that engage one-to-one with the engaging convex portion are formed on the circumferential surface of the block body, By engaging the engaging convex portion with the engaging concave portion, the plurality of teeth portions are erected on the yoke portion, Each of the plurality of teeth portions has a shape dimension such that when the plurality of block bodies are arranged in an annular shape with the teeth portions erected on each of the plurality of block bodies and fixed by the fixing member, the adjacent teeth portions abut against each other over the entire circumference, Each of the plurality of block bodies has a shape dimension such that when the plurality of block bodies are arranged in an annular shape with the teeth portions erected on each of the plurality of block bodies and fixed by the fixing member, a gap is formed between adjacent block bodies. A stator characterized by this.

2. The fixing member is An annular first fixing member disposed on one plane of the yoke portion, An annular second fixing member disposed on the other plane of the yoke portion, and has The widths in the radial direction of the first fixing member and the second fixing member have a length capable of covering the engaging portion between the engaging convex portion of the yoke portion and the engaging concave portion of the teeth portion when fixing the plurality of block bodies in an annular shape. The stator according to claim 1, characterized by this.

3. Engaging portions that engage with each other are formed on the circumferential surface of the yoke portion and the tip of the teeth portion, The plurality of block bodies are screwed to the second fixing member by screws via the first fixing member, Screw holes for screwing are provided at positions corresponding to the engaging portions. The stator according to claim 2, characterized by this.

4. A stator according to any one of claims 1 to 3, and A rotor that rotates by a rotating magnetic field generated by the stator. A motor characterized by having this.

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