Stator

Abstract

To provide a stator that can improve detection accuracy.SOLUTION: A stator 1 according to the present disclosure comprises: a stator body 10 having a yoke part 11 that is a circular ring or a part of a circular ring, and a plurality of teeth parts 12 that extend from the yoke part 11 toward the radial inside of the circular ring; and a plurality of coils (15) that are arranged by being wound around the teeth parts 12. The stator body 10 has one or more magnetic stator members 20, and one or more non-magnetic stator members 30. The magnetic stator member 20 is formed of a magnetic substance. The non-magnetic stator member 30 is formed of a non-magnetic substance. The stator body 10 is formed of the magnetic stator members 20 and the non-magnetic stator members 30 laminated along a direction of the central axis of the circular ring.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a stator. [Background technology]

[0002] Conventionally, in order to reduce manufacturing costs, resolver stators have been known in which a portion of a metal plate is folded and laminated in the axial direction to provide large-volume teeth in a resolver stator made of a single metal plate (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-239531 A Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional resolver stators, the teeth extend in the axial direction, so when coils are wound around the teeth, the air gap between the teeth and the rotor becomes larger, resulting in a problem of reduced detection accuracy.

[0005] In order to solve the above problems, an object of the present disclosure is to provide a stator capable of improving detection accuracy. [Means for solving the problem]

[0006] The stator according to the present disclosure comprises a yoke portion which is a circular ring or an arc which is a part of the circular ring, a stator body having a plurality of teeth extending from the yoke portion radially inward of the circular ring, and a plurality of coils wound around each of the teeth, the stator body having one or more magnetic stator members and one or more non-magnetic stator members, the magnetic stator members being made of a magnetic material, the non-magnetic stator members being made of a non-magnetic material, and the stator body being constructed by stacking the magnetic stator members and the non-magnetic stator members along the central axis direction of the circular ring. Effect of the Invention

[0007] According to the stator according to the present disclosure, it is possible to improve detection accuracy. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing a stator according to a first embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing details of the stator of FIG. [Diagram 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 11 is a cross-sectional view showing a stator body in a first modified example of the first embodiment. [Diagram 5] FIG. 11 is a cross-sectional view showing a stator body in the second embodiment. [Figure 6] FIG. 11 is a cross-sectional view showing a stator body in a first modified example of the second embodiment. [Figure 7] FIG. 11 is a cross-sectional view showing a stator body in a third embodiment. [Figure 8] FIG. 13 is a cross-sectional view showing a stator body in a first modified example of the third embodiment. [Figure 9] FIG. 11 is a schematic diagram showing a non-magnetic stator member in a fourth embodiment. [Figure 10] 13 is a schematic diagram showing a part of a magnetic stator member in the fifth embodiment. FIG. [Figure 11]13 is a schematic diagram showing a part of a non-magnetic stator member in a sixth embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Embodiment 1 Fig. 1 is a schematic diagram showing a stator 1 according to a first embodiment. Fig. 2 is a schematic diagram showing details of the stator 1 in Fig. 1. Fig. 3 is a cross-sectional view showing a cross section taken along line III-III in Fig. 1. The stator 1 can be applied as a stator for a resolver or a torque sensor.

[0010] The stator 1 has a generally circular ring shape. The central axis of the stator 1 is defined as the central axis L. In other words, the central axis L is an axis that passes through the center of the stator 1. A rotating body 50 such as a rotor is disposed in a hole that opens in the center of the stator 1. The central axis L and the rotation axis of the rotating body 50 coincide with each other.

[0011] The stator 1 and the rotating body 50 are arranged in a non-contact state with each other. A resolver or a torque sensor can detect a physical quantity such as a rotation angle, a rotation speed, or a rotation torque of the rotating body 50 by using the stator 1.

[0012] The stator 1 includes a stator body 10 and 14 coils 15. The stator body 10 has a yoke portion 11 which is a ring, and 14 teeth portions 12 which extend from the yoke portion 11 toward the inside in the radial direction of the ring. Each coil 15 is disposed on each of the teeth portions 12.

[0013] The axis passing through the center of the circular ring that is yoke portion 11 is the same as central axis L. Note that the numbers of teeth portions 12 and coils 15 are not limited to 14, and any number may be provided.

[0014] Coil installation portion 12a is formed in the portion of tooth portion 12 that continues from yoke portion 11, and tooth tip portion 12b is formed at the tip of tooth portion 12 that continues from coil installation portion 12a. Teeth tip portion 12b is wider than coil installation portion 12a.

[0015] The radially innermost ends of the teeth 12 are formed in an arc shape when viewed along the central axis L. The radially innermost ends of the tooth tip portions 12b are formed to extend along the same circumference when viewed together.

[0016] When the rotor 50 is disposed on the stator 1, an air gap is formed between each tooth tip 12b and the rotor 50. Each tooth tip 12b and the rotor 50 are not in contact with each other.

[0017] A coil 15 is wound around the coil installation portion 12a of each tooth portion 12. The coil 15 is formed by winding a conductor wire multiple times. Note that the coil 15 does not have to be formed by winding a conductor wire multiple times. For example, one coil 15 may be composed of a pair of coil members formed into a C-shape. One coil 15 may be formed by sandwiching the coil installation portion 12a between a pair of coil members formed into a C-shape and connecting the pair of opposing coil members.

[0018] The stator body 10 has a magnetic stator member 20 and a non-magnetic stator member 30. The stator body 10 is configured by stacking the magnetic stator member 20 and the non-magnetic stator member 30 along the central axis L.

[0019] The stator body 10 is constructed by stacking a magnetic stator member 20 and a non-magnetic stator member 30, which have approximately the same external shape, in a direction along the central axis L. The magnetic stator member 20 and the non-magnetic stator member 30 are each stacked using a conventionally known processing method such as caulking or bonding.

[0020] The magnetic stator member 20 is made of a magnetic material such as electromagnetic steel, permalloy, ferrite, nanocrystalline soft magnetic alloy, or amorphous alloy.

[0021] The non-magnetic stator member 30 is made of a non-magnetic material such as non-magnetic stainless steel or resin.

[0022] The non-magnetic stator member 30 has through holes 30a formed therethrough in a direction along the central axis L. A plurality of through holes 30a are formed at locations of the non-magnetic stator member 30 corresponding to the yoke portions 11.

[0023] If the direction along the central axis L of the magnetic stator member 20 and the non-magnetic stator member 30 is defined as the thickness direction of each, the thickness of the magnetic stator member 20 is thinner than the thickness of the non-magnetic stator member 30. The thicknesses of the magnetic stator member 20 and the non-magnetic stator member 30 can be determined based on the detection accuracy required of the resolver.

[0024] The resolver can measure the rotation angle of the rotor 50. The operating principle of a resolver using the stator 1 of the present disclosure is well known, and therefore will not be described here.

[0025] A rotor 50 with a circular cross section is inserted and placed in a hole opening in the center of the ring of stator 1, as shown in Fig. 1. When current is applied to each coil 15 in this state, the coil 15 is excited and generates a magnetic field. The magnetic flux Φ of the magnetic field generated by coil 15 flows through the magnetic path formed by stator 1.

[0026] One magnetic path formed by the stator 1 runs from any one of the teeth 12 through the yoke portion 11 to reach the teeth 12 adjacent to the given teeth 12 in the circumferential direction. It then travels through a space that is a hole opening in the center of the ring of the stator 1 and returns to the given teeth 12.

[0027] A rotor 50 is disposed in a hole that opens in the center of the ring of the stator 1. When the posture of the rotor 50 changes, the magnetic flux Φ flowing through the magnetic path changes accordingly. The change in posture of the rotor 50 can be detected based on the change in the magnetic flux Φ.

[0028] It is also possible to add a configuration to the rotor 50 that makes it easier to check the change in the attitude of the rotor 50, i.e., the change in magnetic flux Φ due to the rotation of the rotor 50. For example, a plurality of regions with different magnetic permeabilities may be formed on the outer circumferential surface of the rotor 50 that faces the tooth tips 12b. Also, the cross section of the rotor 50 may be made non-circular so that the air gap distances are different.

[0029] In general, the magnetic path formed in a stator is formed in a magnetic member. When the magnetic path is regarded as a magnetic circuit formed in a stator, the magnetic resistance Rm of the magnetic circuit is determined by the length l of the magnetic path, the cross-sectional area S of the magnetic path, and the magnetic permeability μ of the member forming the magnetic path, as follows: Rm=l / μS

[0030] As shown in the above formula, the thickness of the magnetic member where the magnetic path is formed affects the magnetic resistance Rm. That is, as the thickness of the magnetic member where the magnetic path is formed increases, the cross-sectional area S of the magnetic path increases and the magnetic resistance Rm decreases. If the magnetic resistance Rm of the magnetic circuit decreases, the resolver using the stator can detect even minute changes in magnetic flux caused by minute rotations of the rotor, improving the detection accuracy of the resolver.

[0031] The magnetic members are relatively expensive among the materials used in the entire stator, so the manufacturing cost of the stator can be reduced by reducing the amount of magnetic members used, for example by reducing the thickness of the stator according to the detection accuracy of the resolver.

[0032] On the other hand, in each coil wound around the teeth, the thinner the teeth, the shorter the length of the coil winding and the lower the input impedance. Therefore, the strength of the magnetic field generated by each coil is weakened. This reduces the magnetic flux Φ and the amount of change in magnetic flux Φ due to changes in the attitude of the rotor is also reduced, resulting in a decrease in the detection accuracy of the resolver.

[0033] In this way, if the amount of magnetic material used is reduced and the thickness of the stator is thinned to suppress manufacturing costs, the input impedance of the coils decreases, and the detection accuracy of the stator decreases. However, in the first embodiment, even if the thickness of the magnetic stator member 20 is thinned to reduce the amount of magnetic material used, the input impedance of each coil 15 does not decrease, and the detection accuracy of the resolver using the stator 1 does not decrease, because the non-magnetic stator member 30 is laminated on the magnetic stator member 20.

[0034] In the first embodiment, the stator 1 includes the yoke portion 11 which is a ring. However, the present invention is not limited to this. The yoke portion 11 may be an arc which is a part of a ring. For example, the yoke portion 11 may be a quarter arc, i.e., an arc-shaped yoke portion 11 having a central angle of 90 degrees. The stator 1 including the arc-shaped yoke portion 11 can be used as the stator 1 of a resolver that detects the rotation angle of the rotor 50 by disposing the stator 1 along the outer periphery of the rotor 50. This can further reduce the manufacturing cost of the stator 1. In addition, when detecting the rotation angle of an existing rotating shaft or the like, the arc-shaped stator 1 can be easily installed on the existing shaft.

[0035] The stator 1 in the first embodiment includes a yoke portion 11 which is a circular ring or an arc which is a part of the circular ring, a stator body 10 having a plurality of teeth portions 12 extending from the yoke portion 11 toward the inside in the radial direction of the circular ring, and a plurality of coils 15 wound around each of the teeth portions 12. The stator body 10 also includes one or more magnetic stator members 20 and one or more non-magnetic stator members 30. The magnetic stator member 20 is made of a magnetic material, and the non-magnetic stator member 30 is made of a non-magnetic material. The stator body 10 is configured by stacking the magnetic stator member 20 and the non-magnetic stator member 30 along the central axis direction of the circular ring. As a result, in the stator body 10 in which the magnetic stator member 20 and the non-magnetic stator member 30 are laminated, each coil 15 can be arranged on each tooth portion 12 extending radially inward from the yoke portion 11, and the radially innermost end of each tooth portion 12 can be arranged to face the rotor 50. Therefore, the air gap between the rotor 50 and the tooth portion 12 can be reduced. This makes it possible to improve the detection accuracy of a sensor such as a resolver using the stator 1. This also makes it possible to keep the distance between the tooth portion 12 and the yoke portion 11 constant. This makes it difficult for leakage magnetic flux to increase, making it possible to improve the detection accuracy. This also makes it possible to reduce the input impedance of the coil 15 since the tooth portion 12 on which each coil 15 is installed is configured by laminating the magnetic stator member 20 and the non-magnetic stator member 30. Therefore, the input impedance of the coil 15 can be set to an appropriate value while the amount of magnetic material used in the magnetic stator member 20 is set to an appropriate amount according to the detection accuracy. Therefore, the detection accuracy of the sensor using the stator 1 can be improved while keeping the amount of magnetic material used appropriate. Also, a magnetic stator member 20 having a required volume according to the required detection accuracy can be prepared. Therefore, the amount of magnetic material used can be set to an optimal amount, and manufacturing costs can be reduced. Also, because the magnetic stator member 20 and the non-magnetic stator member 30 are laminated, the mechanical strength of the magnetic stator member 20 can be ensured even if the thickness of the magnetic stator member 20 is reduced.

[0036] In the stator 1 of the first embodiment, the magnetic stator member 20 and the non-magnetic stator member 30 have different thicknesses in the stacking direction. This allows the thickness of the magnetic stator member 20 to be designed taking into consideration the magnetic resistance of the magnetic path formed in the stator 1. On the other hand, the thickness of the non-magnetic stator member 30 can be designed taking into consideration the input impedance of the coil 15 and the mechanical strength of the stator 1. This allows the amount of magnetic material used in the stator 1 to be reduced while maintaining the detection accuracy of a sensor using the stator 1. Furthermore, the stator 1 can have the necessary mechanical strength regardless of the amount of magnetic material used.

[0037] In the stator 1 of the first embodiment, the thickness of the magnetic stator member 20 and the non-magnetic stator member 30 in the stacking direction is thinner than the non-magnetic stator member 30. As a result, even in the magnetic stator member 20 that is composed of the minimum necessary amount of magnetic member, by making the non-magnetic stator member 30 thick, it is possible to provide the stator 1 with the necessary mechanical strength.

[0038] In the stator 1 of the first embodiment, the non-magnetic stator member 30 has a plurality of through holes 30a formed therein, which penetrate in the direction in which the magnetic stator member 20 and the non-magnetic stator member 30 are stacked. This contributes to reducing the weight of the stator 1. This also contributes to reducing the amount of non-magnetic material used in the non-magnetic stator member 30, thereby reducing manufacturing costs.

[0039] In the stator 1 of the first embodiment, each through hole 30a is formed at a position corresponding to the yoke portion 11 of the non-magnetic stator member 30. This allows the weight of the non-magnetic stator member 30 to be reduced and the amount of material used for the non-magnetic stator member 30 to be reduced without significantly reducing the mechanical strength of the non-magnetic stator member 30.

[0040] Variation 1 of the first embodiment Stator 1 in Modification 1 of Embodiment 1 differs from stator 1 in Embodiment 1 in that stator body 10 has two magnetic stator members 20 and two non-magnetic stator members 30.

[0041] Fig. 4 is a cross-sectional view showing the stator body 10 of the first modified example of the embodiment 1. Fig. 4 shows a cross-sectional view of the stator body 10 in the first modified example of the embodiment 1 taken along a line similar to line III-III in Fig. 1.

[0042] The stator body 10 has two magnetic stator members 20 and two non-magnetic stator members 30. The stator body 10 is configured by stacking the magnetic stator members 20 and the non-magnetic stator members 30 alternately.

[0043] In other words, in the stacking direction, the non-magnetic stator member 30 is stacked below the magnetic stator member 20, and when this is viewed as one block, two such blocks are stacked to form the stator body 10. The other configuration of the stator 1 in the first modification of the first embodiment is the same as the configuration of the stator 1 in the first embodiment, so a description thereof will be omitted.

[0044] The stator 1 in the first modification of the first embodiment has two magnetic stator members 20 and two non-magnetic stator members 30. However, this is not limited to this. The stator 1 may have two or more magnetic stator members 20 and two or more non-magnetic stator members 30. Furthermore, one magnetic stator member 20 and one non-magnetic stator member 30 may be alternately stacked.

[0045] In the stator 1 in the first modification of the first embodiment, the magnetic stator members 20 and the non-magnetic stator members 30 are alternately stacked one by one. This makes it possible to form a uniform magnetic field over a long range along the stacking direction while minimizing the amount of magnetic material used. Therefore, it is possible to detect physical quantities such as the rotation angle at any position along the longitudinal direction of the rotor 50 while minimizing the amount of magnetic material used. Therefore, it is possible to observe the rotor 50 along the longitudinal direction of the rotor 50 while minimizing the increase in the amount of magnetic material used.

[0046] Embodiment 2 Fig. 5 is a cross-sectional view showing the stator body 10 of the embodiment 2. Fig. 5 shows a cross-sectional view of the stator body 10 in the embodiment 2 taken along the same line as line III-III in Fig. 1.

[0047] The stator 1 in the second embodiment differs from the stator 1 in the first embodiment in that the stator body 10 has two magnetic stator members 20 and one non-magnetic stator member 30.

[0048] The stator body 10 has a laminate 40 configured by stacking two magnetic stator members 20 sandwiching one non-magnetic stator member 30. In the second embodiment, the stator body 10 is configured of one laminate 40. The other configuration of the stator 1 in the second embodiment is the same as the configuration of the stator 1 in the first embodiment, so a description thereof will be omitted.

[0049] In the stator 1 in the second embodiment, when the magnetic stator member 20 is the first member and the non-magnetic stator member 30 is the second member, the stator body 10 has a laminated body 40 in which at least two first members are laminated with at least one second member sandwiched between them. That is, the magnetic stator members 20 are laminated with the non-magnetic stator member 30 sandwiched between them. This allows the pair of magnetic stator members 20 to be disposed with an appropriate interval between them. Therefore, it is possible to detect the physical quantity of the corresponding portion of the rotor 50 along the lamination direction while suppressing an increase in the amount of magnetic material used.

[0050] The stator body 10 in the second embodiment has a laminated body 40 in which two magnetic stator members 20 and one non-magnetic stator member 30 are laminated. However, the present invention is not limited to this. The stator body 10 may have two or more magnetic stator members 20 and two or more non-magnetic stator members 30. For example, the stator body 10 may have a laminated body 40 in which two laminated non-magnetic stator members 30 are sandwiched between a pair of magnetic stator members 20 and laminated. This allows the spacing between the pair of magnetic stator members 20 to be changed by changing the number of non-magnetic stator members 30, and makes it easy to manufacture a stator 1 that corresponds to the detection location of the rotating body 50. Also, for example, the stator body 10 may have a laminated body 40 in which one non-magnetic stator member 30 is sandwiched between two laminated magnetic stator members 20 and laminated. That is, the laminated body 40 may be laminated in the order of two magnetic stator members 20, one non-magnetic stator member 30, and two magnetic stator members 20. This makes it possible to change the strength of the magnetic flux by changing the number of magnetic stator members 20, and thus the stator 1 can be easily adapted to the required detection accuracy.

[0051] Variation 1 of embodiment 2 The stator 1 in the first modification of the second embodiment differs from the stator 1 in the second embodiment in that the stator body 10 has four magnetic stator members 20 and two non-magnetic stator members 30.

[0052] Fig. 6 is a cross-sectional view showing the stator body 10 of the first modified example of the embodiment 2. Fig. 6 shows a cross-sectional view of the stator body 10 in the first modified example of the embodiment 2 taken along a line similar to line III-III in Fig. 1.

[0053] The stator body 10 has four magnetic stator members 20 and two non-magnetic stator members 30. When two magnetic stator members 20 are stacked with one non-magnetic stator member 30 sandwiched therebetween to form one laminated body 40, the stator body 10 of this embodiment is configured by continuously stacking two laminated bodies 40. The other configuration of the stator 1 in the first modification of the second embodiment is the same as the configuration of the stator 1 in the second embodiment, and therefore description thereof will be omitted.

[0054] The stator 1 in the first modification of the second embodiment is configured by continuously stacking two laminates 40. However, this is not limited to this. For example, the stator body 10 may be configured by continuously stacking three or more laminates 40.

[0055] In the stator 1 in the first modification of the second embodiment, the stator body 10 is configured by continuously stacking two or more laminates 40. This makes it possible to easily predict the characteristics of the stator 1 including the stator body 10 in which one laminate 40 is continuously stacked. That is, based on the characteristics of one laminate 40, which is one non-magnetic stator member 30 and two magnetic stator members 20 sandwiching one non-magnetic stator member 30, it is possible to predict the characteristics of the stator body 10 in which a plurality of laminates 40 are continuously stacked. This makes it possible to reduce the design cost of the stator 1 and shorten the design period. In addition, this makes it possible to manufacture the stator body 10 by manufacturing a plurality of one laminate 40 and continuously stacking the required number of laminates 40 as necessary. This makes it possible to reduce the manufacturing cost of the stator body 10 and shorten the manufacturing period.

[0056] Embodiment 3 Fig. 7 is a cross-sectional view showing the stator body 10 of embodiment 3. Fig. 7 shows a cross-sectional view of the stator body 10 in embodiment 3 taken along the same line as line III-III in Fig. 1.

[0057] The stator 1 in the third embodiment differs from the stator 1 in the first embodiment in that the stator body 10 has two non-magnetic stator members 30 and one magnetic stator member 20.

[0058] The stator body 10 has a laminated body 40 configured by stacking two non-magnetic stator members 30 sandwiching one magnetic stator member 20. In the third embodiment, the stator body 10 is configured of one laminated body 40. The other configuration of the stator 1 in the third embodiment is the same as the configuration of the stator 1 in the first embodiment, so a description thereof will be omitted.

[0059] In the stator 1 in the third embodiment, when the non-magnetic stator member 30 is the first member and the magnetic stator member 20 is the second member, the stator body 10 has a laminated body 40 in which at least two first members are laminated with at least one second member sandwiched between them. That is, the laminated body 40 is a laminated body in which the non-magnetic stator member 30 is laminated with the magnetic stator member 20 sandwiched between them. As a result, the magnetic stator member 20 is protected by being sandwiched between the non-magnetic stator members 30, and there is no risk of damage such as bending even if the magnetic stator member 20 interferes with another member. Therefore, the magnetic stator member 20 can be made thin as necessary, and further, even if the magnetic stator member 20 is made thin, the possibility of the magnetic stator member 20 being damaged can be reduced.

[0060] The stator body 10 in the third embodiment has a laminated body 40 in which one magnetic stator member 20 is sandwiched between two non-magnetic stator members 30 and laminated. However, the present invention is not limited to this. The stator body 10 may have a laminated body 40 in which two or more magnetic stator members 20 and two or more non-magnetic stator members 30 are laminated. For example, two laminated magnetic stator members 20 may be sandwiched between a pair of non-magnetic stator members 30 to form the laminated body 40. This allows the strength of the magnetic flux to be changed by adjusting and changing the number of magnetic stator members 20, and allows the design and manufacture of the stator 1 to be relatively easily adapted according to the required detection accuracy. In addition, for example, one magnetic stator member 20 may be sandwiched between two laminated non-magnetic stator members 30 to form the laminated body 40. That is, the laminated body 40 may have two non-magnetic stator members 30, one magnetic stator member 20, and two non-magnetic stator members 30 laminated in this order. This prevents a decrease in the input impedance of each coil 15. Therefore, the stator 1 can be easily manufactured based on the input impedance of each coil 15.

[0061] Variation 1 of embodiment 3 Stator 1 in the first modification of the third embodiment differs from stator 1 in the third embodiment in that stator body 10 has four non-magnetic stator members 30 and two magnetic stator members 20.

[0062] Fig. 8 is a cross-sectional view showing the stator body 10 of the first modified example of the embodiment 3. Fig. 8 shows a cross-sectional view of the stator body 10 in the first modified example of the embodiment 3 taken along a line similar to line III-III in Fig. 1.

[0063] The stator body 10 has four non-magnetic stator members 30 and two magnetic stator members 20. When one magnetic stator member 20 is sandwiched between two non-magnetic stator members 30 and stacked to form one laminated body 40, the stator body 10 is configured by continuously stacking two laminated bodies 40. The other configuration of the stator 1 in the first modification of the third embodiment is the same as the configuration of the stator 1 in the third embodiment, and therefore description thereof will be omitted.

[0064] In the stator body 10 in the first modification of the third embodiment, when one magnetic stator member 20 and two non-magnetic stator members 30 sandwiching the one magnetic stator member 20 are viewed as one laminate 40, two laminates 40 are laminated to form the stator body 10. However, this is not limited to this. For example, the stator body 10 may be formed by continuously laminating three or more laminates 40.

[0065] In the stator 1 in the first modification of the third embodiment, the stator body 10 is configured by continuously stacking two or more laminates 40. This makes it possible to easily predict the characteristics of the stator body 10 in which one laminate 40 is continuously stacked. That is, based on the characteristics of one laminate 40 in which one magnetic stator member 20 is sandwiched between two non-magnetic stator members 30 and stacked, it is possible to easily predict the characteristics of the stator body 10 in which a plurality of laminates 40 are continuously stacked. This makes it possible to reduce the design cost of the stator 1 and shorten the design period. In addition, this makes it possible to manufacture a plurality of one laminate 40, and to manufacture the stator body 10 by continuously stacking the required number of laminates 40 as necessary. This makes it possible to reduce the manufacturing cost of the stator body 10 and shorten the manufacturing period.

[0066] Embodiment 4 Stator 1 in embodiment 4 differs from stator 1 in embodiment 1 in that the outer shape of non-magnetic stator member 30 is different from the outer shape of magnetic stator member 20. Fig. 9 is a schematic diagram showing non-magnetic stator member 30 in embodiment 4.

[0067] When viewed along the central axis L, the outer shape of the non-magnetic stator member 30 is different from the outer shape of the magnetic stator member 20. The outer periphery of the non-magnetic stator member 30 is formed with a plurality of recesses 30b.

[0068] The recess 30b is formed in a part of a portion corresponding to an outer peripheral edge portion of the yoke portion 11 of the stator body 10. The recess 30b is also formed in a portion corresponding to the tooth tip portion 12b of the stator body 10, on the surface facing the rotor 50.

[0069] The recess 30b is not formed over the entire periphery of the portion corresponding to the outer peripheral edge of the yoke portion 11 of the stator body 10. The recess 30b is not formed in the portion corresponding to the coil installation portion 12a of the teeth portion 12 of the stator body 10.

[0070] Recesses 30b are not formed in portions corresponding to ends of teeth tips 12b of teeth 12 of stator body 10. Other structures of stator 1 in embodiment 4 are similar to those in embodiment 1, and therefore description thereof will be omitted.

[0071] In the stator 1 in the fourth embodiment, when viewed along the central axis L of the stator 1, the outer shape of the magnetic stator member 20 and the outer shape of the nonmagnetic stator member 30 are different. Thus, by providing the recess 30b, the weight of the nonmagnetic stator member 30 can be reduced, and thus the weight of the stator 1 can be reduced. In addition, the nonmagnetic stator member 30 can be manufactured using less material. This allows the manufacturing cost of the nonmagnetic stator member 30 to be reduced.

[0072] In the stator 1 of the fourth embodiment, the recess 30b is not formed over the entire circumference of the portion corresponding to the outer circumferential edge of the yoke portion 11 of the stator body 10. As a result, the magnetic stator member 20 and the non-magnetic stator member 30 are laminated in a portion of the portion corresponding to the outer circumferential edge of the yoke portion 11 of the stator body 10. Therefore, the magnetic stator member 20 is supported by the non-magnetic stator member 30 in the portion corresponding to the outer circumferential edge of the yoke portion 11 of the stator body 10, and maintains the necessary strength. Therefore, the possibility that the magnetic stator member 20 will be damaged in the portion corresponding to the outer circumferential edge of the yoke portion 11 of the stator body 10 can be reduced.

[0073] Furthermore, according to the stator 1 of the fourth embodiment, the recesses 30b are not formed in the portions corresponding to the coil installation portions 12a of the teeth 12 of the stator body 10. As a result, even if the coil 15 is wound around the coil installation portion 12a, the magnetic stator member 20 maintains the necessary strength by being supported by the non-magnetic stator member 30. This reduces the possibility that the magnetic stator member 20 will be damaged in the portions corresponding to the coil installation portions 12a of the teeth 12 of the stator body 10.

[0074] Furthermore, according to the stator 1 of the fourth embodiment, the recesses 30b are not formed at the ends of the tooth tips 12b of the teeth 12 of the stator body 10. As a result, the magnetic stator members 20 corresponding to the ends of the tooth tips 12b of the teeth 12 of the stator body 10 are supported by the non-magnetic stator member 30, thereby maintaining the necessary strength. This reduces the possibility that the magnetic stator member 20 will be damaged in the portions corresponding to the ends of the tooth tips 12b of the teeth 12 of the stator body 10.

[0075] In the external shape of the non-magnetic stator member 30 in the fourth embodiment, the external shape of the portion excluding the recess 30b is equal to the external shape of the corresponding portion of the magnetic stator member 20. However, this is not limited to this. For example, the external shape of the non-magnetic stator member 30 may be larger than the external shape of the magnetic stator member 20. This prevents damage to the magnetic stator member 20, for example, when the stator 1 interferes with another object, since the non-magnetic stator member 30, which protrudes greatly, interferes with the object first. This further reduces the possibility of damage to the magnetic stator member 20.

[0076] Moreover, the non-magnetic stator member 30 in the fourth embodiment does not have a through hole 30a. However, this is not limited to this. The non-magnetic stator member 30 may have one or more through holes 30a in addition to the multiple recesses 30b. This can further reduce the weight of the non-magnetic stator member 30 and the manufacturing costs.

[0077] Embodiment 5. The magnetic stator member 20 in the fifth embodiment differs from the stator 1 in the first embodiment in that it is configured by connecting a plurality of magnetic stator pieces 25. Fig. 10 is a schematic diagram showing a part of the magnetic stator member 20 in the fifth embodiment.

[0078] The magnetic stator member 20 has a plurality of magnetic stator pieces 25. The magnetic stator member 20 is formed by connecting a plurality of magnetic stator pieces 25. Each magnetic stator piece 25 is formed with a magnetic tooth portion 26 corresponding to the tooth portion 12 of the stator body 10, and a magnetic yoke portion 27 corresponding to a part of the yoke portion 11.

[0079] A magnetic convex portion 25a is formed at one circumferential end of the arc-shaped magnetic yoke portion 27 of each magnetic stator piece 25. A magnetic concave portion 25b is formed at the other circumferential end opposite to the one end of the arc-shaped magnetic yoke portion 27. When the magnetic stator pieces 25 are connected to each other, the magnetic convex portion 25a of one magnetic stator piece 25 is connected to the magnetic concave portion 25b of another magnetic stator piece 25, thereby connecting the two magnetic stator pieces 25 to each other.

[0080] A plurality of magnetic stator pieces 25 are connected to form a ring or an arc, which constitutes magnetic stator member 20. Other structures of stator 1 in embodiment 5 are similar to those in embodiment 1, and therefore description thereof will be omitted.

[0081] According to the stator 1 in the fifth embodiment, each magnetic stator member 20 has a plurality of magnetic stator pieces 25. Moreover, the magnetic stator member 20 is formed by connecting a plurality of magnetic stator pieces 25. Moreover, each magnetic stator piece 25 is formed with a magnetic tooth portion 26 corresponding to the tooth portion 12, and a magnetic yoke portion 27 corresponding to a part of the yoke portion 11. This allows the magnetic steel sheet to be used without waste when cutting out the magnetic stator pieces 25 from the magnetic steel sheet, thereby reducing manufacturing costs.

[0082] In addition, magnetic convex portions 25a and magnetic concave portions 25b are formed on the magnetic stator pieces 25 in the fifth embodiment in order to connect them to each other. However, this is not limited to this. A well-known configuration can be used for the connection mechanism of each magnetic stator piece 25.

[0083] Embodiment 6 Non-magnetic stator member 30 in embodiment 6 differs from stator 1 in embodiment 1 in that non-magnetic stator member 30 is configured by connecting a plurality of non-magnetic stator pieces 35. Fig. 11 is a schematic diagram showing a portion of non-magnetic stator member 30 in embodiment 6.

[0084] The non-magnetic stator member 30 has a plurality of non-magnetic stator pieces 35. The non-magnetic stator member 30 is formed by connecting a plurality of non-magnetic stator pieces 35. Each non-magnetic stator piece 35 is formed with a non-magnetic tooth portion 36 corresponding to the tooth portion 12 of the stator body 10, and a non-magnetic yoke portion 37 corresponding to a part of the yoke portion 11.

[0085] A nonmagnetic convex portion 35a is formed at one circumferential end of the arc-shaped nonmagnetic yoke portion 37 of each nonmagnetic stator piece 35. A nonmagnetic concave portion 35b is formed at the other circumferential end opposite to the one end of the arc-shaped nonmagnetic yoke portion 37. When the nonmagnetic stator pieces 35 are connected together, the nonmagnetic convex portion 35a of one nonmagnetic stator piece 35 is connected to the nonmagnetic concave portion 35b of another nonmagnetic stator piece 35, thereby connecting the two nonmagnetic stator pieces 35 to each other.

[0086] A plurality of non-magnetic stator pieces 35 are connected to form a ring or a circular arc, which constitutes non-magnetic stator member 30. Other structures of stator 1 in embodiment 6 are similar to those in embodiment 1, and therefore description thereof will be omitted.

[0087] According to the stator 1 in the sixth embodiment, each non-magnetic stator member 30 has a plurality of non-magnetic stator pieces 35. The non-magnetic stator member 30 is formed by connecting a plurality of non-magnetic stator pieces 35. Each non-magnetic stator piece 35 has a non-magnetic tooth portion 36 corresponding to the tooth portion 12 and a non-magnetic yoke portion 37 corresponding to a part of the yoke portion 11. This eliminates the need to enlarge the mold and resin molding device required for the resin molding, as compared to manufacturing a large non-magnetic stator member 30. This reduces the manufacturing cost of the non-magnetic stator member 30. This also reduces the storage space required, as compared to storing a large manufactured non-magnetic stator member 30, and reduces the storage cost of the parts.

[0088] Stator 1 can also be manufactured using magnetic stator pieces 25 in embodiment 5 and non-magnetic stator pieces 35 in embodiment 6. In this case, first, magnetic stator pieces 25 and corresponding non-magnetic stator pieces 35 are laminated. Next, coils 15 are installed at positions corresponding to teeth portions 12. Thereafter, multiple intermediate products in which magnetic stator pieces 25 with coils 15 installed and non-magnetic stator pieces 35 are laminated can be connected to manufacture stator 1. Manufacturing in this manner makes it easier to install coils 15, and manufacturing costs can be reduced.

[0089] In addition, the non-magnetic stator pieces 35 in the sixth embodiment are formed with non-magnetic convex portions 35a and non-magnetic concave portions 35b for connecting the non-magnetic stator pieces 35 to each other. However, this is not limited to this. A well-known configuration can be used for the connecting mechanism of each non-magnetic stator piece 35.

[0090] Furthermore, each of the configurations described in embodiment 1, variant 1 of embodiment 1, embodiment 2, variant 1 of embodiment 2, embodiment 3, variant 1 of embodiment 3, embodiment 4, embodiment 5, and embodiment 6 can be adapted to other embodiments.

[0091] Various aspects of the present disclosure are summarized below as appendices.

[0092] (Appendix 1) a stator body (10) having a yoke portion (11) which is a circular ring or a circular arc which is a part of the circular ring, and a plurality of teeth portions (12) extending from the yoke portion (11) toward a radially inner side of the circular ring; A plurality of coils (15) are wound around each of the teeth portions (12); Equipped with The stator body (10) has one or more magnetic stator members (20) and one or more non-magnetic stator members (30), The magnetic stator member (20) is made of a magnetic material, The non-magnetic stator member (30) is made of a non-magnetic material, The stator body (10) is configured by stacking the magnetic stator member (20) and the non-magnetic stator member (30) along the central axis direction of the ring. Stator. (Appendix 2) When viewed along the central axis (L) of the stator (1), the outer shape of the magnetic stator member (20) and the outer shape of the non-magnetic stator member (30) are different from each other. 2. The stator of claim 1. (Appendix 3) The magnetic stator member (20) and the non-magnetic stator member (30) have different thicknesses in the stacking direction. 3. The stator according to claim 1 or 2. (Appendix 4) The thickness of the magnetic stator member (20) and the non-magnetic stator member (30) in the stacking direction is thinner than that of the non-magnetic stator member (30). 4. The stator according to claim 1 , (Appendix 5) The non-magnetic stator member (30) is formed with a plurality of through holes (30a) penetrating in the direction in which the magnetic stator member (20) and the non-magnetic stator member (30) are stacked. 5. The stator according to claim 1 , (Appendix 6) Each of the through holes (30a) is formed at a position of the non-magnetic stator member (30) corresponding to the yoke portion (11). 6. The stator according to claim 5. (Appendix 7) When one of the magnetic stator member (20) and the non-magnetic stator member (30) is a first member, and the other of the magnetic stator member (20) and the non-magnetic stator member (30), which is different from the first member, is a second member, The stator body (10) has a laminate (40) in which at least two of the first members are laminated with at least one of the second members sandwiched therebetween. 7. The stator according to claim 1 , (Appendix 8) The stator body (10) is configured by continuously stacking two or more of the laminated bodies (40). 8. The stator of claim 7. (Appendix 9) The magnetic stator members (20) and the non-magnetic stator members (30) are alternately stacked one by one. 7. The stator according to claim 1 , (Appendix 10) Each of the magnetic stator members (20) has a plurality of magnetic stator pieces (25), The magnetic stator member (20) is formed by connecting the plurality of magnetic stator pieces (25), Each of the magnetic stator pieces (25) is formed with a magnetic teeth portion (26) corresponding to the tooth portion (12) and a magnetic yoke portion (27) corresponding to a part of the yoke portion (11). 10. The stator according to any one of claims 1 to 9. (Appendix 11) Each of the non-magnetic stator members (30) has a plurality of non-magnetic stator pieces (35), The non-magnetic stator member (30) is formed by connecting the plurality of non-magnetic stator pieces (35), Each of the non-magnetic stator pieces (35) is formed with a non-magnetic teeth portion (36) corresponding to the teeth portion (12) and a non-magnetic yoke portion (37) corresponding to a part of the yoke portion (11). 11. The stator according to any one of claims 1 to 10. [Explanation of symbols]

[0093] 1 stator, 10 stator body, 11 yoke portion, 12 teeth portion, 12a coil mounting portion, 12b teeth tip portion, 15 coil, 20 magnetic stator member, 25 magnetic stator piece, 25a magnetic convex portion, 25b magnetic concave portion, 26 magnetic teeth portion, 27 magnetic yoke portion, 30 non-magnetic stator member, 30a through hole, 30b concave portion, 35 non-magnetic stator piece, 35a non-magnetic convex portion, 35b non-magnetic concave portion, 36 non-magnetic teeth portion, 37 non-magnetic yoke portion, 40 laminated body, 50 rotating body, L central axis line.

Claims

1. A stator body (10) having a yoke portion (11) which is a circular ring or an arc which is a part of the circular ring, and a plurality of teeth portions (12) extending from the yoke portion (11) toward a radially inner side of the circular ring; A plurality of coils (15) are wound around each of the teeth portions (12); Equipped with The stator body (10) has one or more magnetic stator members (20) and one or more non-magnetic stator members (30); The magnetic stator member (20) is made of a magnetic material, The non-magnetic stator member (30) is made of a non-magnetic material, The stator body (10) is configured by stacking the magnetic stator member (20) and the non-magnetic stator member (30) along the central axis direction of the ring. Stator.

2. When viewed along the central axis (L) of the stator (1), the outer shape of the magnetic stator member (20) and the outer shape of the non-magnetic stator member (30) are different. The stator according to claim 1 .

3. The magnetic stator member (20) and the non-magnetic stator member (30) have different thicknesses in the stacking direction. The stator according to claim 1 .

4. The thickness of the magnetic stator member (20) and the non-magnetic stator member (30) in the stacking direction is thinner than that of the non-magnetic stator member (30). The stator according to claim 1 .

5. The non-magnetic stator member (30) is formed with a plurality of through holes (30a) penetrating in the direction in which the magnetic stator member (20) and the non-magnetic stator member (30) are stacked. The stator according to claim 1 .

6. Each of the through holes (30a) is formed at a position corresponding to the yoke portion (11) of the non-magnetic stator member (30). The stator according to claim 5.

7. When one of the magnetic stator member (20) and the non-magnetic stator member (30) is a first member, and the other of the magnetic stator member (20) and the non-magnetic stator member (30) that is different from the first member is a second member, The stator body (10) has a lamination (40) in which at least two of the first members are laminated with at least one of the second members sandwiched therebetween. The stator according to claim 1 .

8. The stator body (10) is constructed by continuously stacking two or more of the laminations (40).

8. The stator according to claim 7.

9. The magnetic stator members (20) and the non-magnetic stator members (30) are alternately stacked one by one. The stator according to claim 1 .

10. Each of the magnetic stator members (20) has a plurality of magnetic stator pieces (25), The magnetic stator member (20) is formed by connecting the plurality of magnetic stator pieces (25), Each of the magnetic stator pieces (25) is formed with a magnetic teeth portion (26) corresponding to the tooth portion (12) and a magnetic yoke portion (27) corresponding to a part of the yoke portion (11). The stator according to claim 1 .

11. Each of the non-magnetic stator members (30) has a plurality of non-magnetic stator pieces (35), The non-magnetic stator member (30) is formed by connecting the plurality of non-magnetic stator pieces (35), Each of the non-magnetic stator pieces (35) is formed with a non-magnetic teeth portion (36) corresponding to the teeth portion (12) and a non-magnetic yoke portion (37) corresponding to a part of the yoke portion (11). The stator according to claim 1 .

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