Stator

Abstract

The invention discloses a stator. The stator comprises a stator body and a coil, the stator body is provided with a yoke part and a tooth part, and the yoke part is a circular ring or an arc serving as a part of the circular ring; the tooth part extends from the yoke part to the inner radial direction of the circular ring; the coil is wound on each tooth part; the stator body is provided with a plurality of magnetic stator components and a plurality of non-magnetic stator components, and the magnetic stator components and the non-magnetic stator components are axially stacked; the thickness of the magnetic stator part in the stacking direction is thinner than the thickness of the non-magnetic stator part. According to the invention, the cost is reduced while the detection precision is met, and the detection precision is greatly improved while the cost is slightly improved; the stator structure can be easily adjusted according to the detection precision requirement, and a stator corresponding to a rotor detection point can be conveniently manufactured.

Description

Technical Field

[0001] The invention relates to the field of rotary transformers, and in particular to a stator. Background Art

[0002] In the rotary transformer of the prior art, the stator adopts a whole piece of magnetic stator components stacked axially, and the coil is wound on the teeth of the stator. The stacking thickness of the magnetic stator components determines the length of the coil winding, and the length of the coil winding determines the size of the input impedance, which ultimately affects the detection accuracy of the rotary transformer. In order to ensure the detection accuracy, the existing design often gives priority to ensuring the effective coil winding length. At this time, the amount of magnetic stator components is relatively fixed, and the higher the thickness of the magnetic material in the stator, the higher the detection accuracy of the rotary transformer. Considering that the cost of magnetic materials is relatively high, and not all rotary transformers require such high detection accuracy, this causes waste of resources and cost increase, and the detection accuracy of the rotary transformer designed in this way is relatively fixed; at the same time, the whole piece of magnetic stator components is not conducive to production, storage and installation, resulting in increased costs; in addition, since the axial profile size of the stator outer contour is consistent, it cannot form a good physical protection when encountering external interference. At the same time, if the distance between the motor coil and the rotary transformer stator is too close, the magnetic flux generated by the motor will flow into the rotary transformer coil, forming electromagnetic interference. Summary of the invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the background technology, the present invention discloses a stator that can reduce costs while ensuring detection accuracy.

[0004] Technical solution: The stator disclosed in the present invention comprises a stator body and a coil; The stator body has a yoke and a tooth portion, wherein the yoke is a circular ring or a circular arc that is a part of a circular ring; the tooth portion extends from the yoke to the inner radial direction of the circular ring; and the coil is wound around each tooth portion; The stator body has a plurality of magnetic stator components and a plurality of non-magnetic stator components, and the magnetic stator components and the non-magnetic stator components are axially stacked; The thickness of the magnetic stator component in the stacking direction is thinner than the thickness of the non-magnetic stator component.

[0005] Furthermore, the axial outer contour of the magnetic stator component is smaller than the axial outer contour of the non-magnetic stator component.

[0006] Furthermore, the non-magnetic stator component has one or more through holes in the stacking direction.

[0007] Further, each of the through holes is formed at a position corresponding to the yoke.

[0008] Furthermore, the magnetic stator components and the non-magnetic stator components are stacked alternately.

[0009] Furthermore, the stator body has a superimposed body, wherein the superimposed body is at least two magnetic stator components laminated with at least one non-magnetic stator component, or at least two non-magnetic stator components laminated with at least one magnetic stator component.

[0010] Furthermore, the stator body is formed by stacking two or more superimposed bodies.

[0011] Furthermore, each of the magnetic stator components is formed by connecting a plurality of magnetic stator sheets; each magnetic stator sheet forms a magnetic tooth portion corresponding to the tooth portion and a magnetic yoke portion corresponding to a portion of the yoke portion.

[0012] Furthermore, each of the non-magnetic stator components is formed by connecting a plurality of non-magnetic stator sheets; each non-magnetic stator sheet forms a non-magnetic tooth portion corresponding to the tooth portion and a non-magnetic yoke portion corresponding to a portion of the yoke portion.

[0013] Beneficial effects: Compared with the prior art, the advantages of the present invention are: While meeting the detection accuracy, reduce the cost, while minimizing the cost, greatly improve the detection accuracy; The stator structure can be easily adjusted according to the detection accuracy requirements, making it easier to manufacture the stator corresponding to the rotor detection point; The non-magnetic stator component bears the main support, and the magnetic stator component can be made thinner as needed, with less risk of damage; It can reduce stator physical interference and external electromagnetic interference; The structure of axial stacking and circumferential multi-piece connection can reduce manufacturing cost and cycle, and facilitate storage and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the stator in Example 1; Figure 2 It is a schematic diagram of the local structure of the stator in Example 1; Figure 3 for Figure 1 Sectional view at III-III; Figure 4 is a cross-sectional view of the stator body in Example 2; Figure 5 is a cross-sectional view of the stator body in Example 3; Figure 6 is a cross-sectional view of the stator body in Example 4; Figure 7 is a cross-sectional view of the stator body in Example 5; Figure 8 is a cross-sectional view of the stator body in Example 6; Fig. 9 This is a schematic structural diagram of the non-magnetic stator component in Example 7; Fig.10 This is a schematic diagram of the structure of the magnetic stator component in Example 8; Fig.11 This is a schematic diagram of the structure of the non-magnetic stator component in Example 9. DETAILED DESCRIPTION

[0015] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments. Example 1

[0016] like Figure 1-3 The figure shows a stator 1 for a rotary transformer or a torque sensor. The stator 1 is in a circular ring shape, and the central axis of the ring is L. The rotor 50 is arranged in the central opening of the stator 1. The stator 1 and the rotor 50 have a common central axis L. There is a gap between the stator 1 and the rotor 50, and they are non-contacting with each other.

[0017] The stator 1 is composed of a stator body 10 and a plurality of coils 15 .

[0018] In this embodiment, 14 coils 15 are used.

[0019] The stator body 10 includes a yoke 11, and the yoke 11 extends from the circular ring diameter to form 14 teeth 12, and each coil 15 is respectively disposed on each tooth 12. The axis passing through the center of the yoke 11 coincides with the central axis L.

[0020] The tooth portion 12 includes a coil mounting portion 12a extending radially inward from the yoke portion 11 and a tooth tip portion 12b located at a radial end of the coil mounting portion 12a, wherein the tooth tip portion 12b is wider than the coil mounting portion 12a, and the coil mounting portion 12a is arranged at intervals in the circumferential direction of the inner circle of the yoke portion 11, and the inner end of the tooth tip portion 12b is arc-shaped, and all the tooth tip portions 12b are located on the same circumference in the axial perspective. When the rotor 50 is placed in the stator 1, each tooth tip portion 12b forms an air gap space with the rotor 50.

[0021] The coil 15 is wound around the coil mounting portion 12 a of each tooth portion 12 .

[0022] The coil 15 may be formed by winding a conductor multiple times, or may be composed of a pair of C-shaped coil members, wherein the pair of C-shaped coil members sandwich the coil mounting portion 12 a and are connected together to form a coil 15 .

[0023] like Figure 3As shown, the stator body 10 includes a magnetic stator component 20 and a non-magnetic stator component 30. The magnetic stator component 20 and the non-magnetic stator component 30 are stacked along the central axis L, have the same axial shape, and are stacked using existing processing methods such as riveting, gluing, etc.

[0024] The magnetic stator component 20 is made of magnetic material, which may be electromagnetic steel plate, super heat-resistant alloy, ferrite or nanocrystalline soft magnetic alloy, etc.; the non-magnetic stator component 30 is made of non-magnetic material, which may be non-magnetic stainless steel, aluminum or resin, etc.

[0025] The yoke 11 of the non-magnetic stator component 30 is provided with a plurality of through holes 30 a penetrating along the central axis L direction.

[0026] The thickness of the magnetic stator component 20 is thinner than the thickness of the non-magnetic stator component 30 .

[0027] The rotary transformer can measure the rotation angle of the rotor 50. The working principle of the rotary transformer using the stator 1 disclosed in the present application is well known and will not be described in detail. The thickness of the magnetic stator component 20 and the non-magnetic stator component 30 is determined and flexibly adjusted according to the detection accuracy required by the rotary transformer.

[0028] like Figure 1 As described, a rotor 50 with a circular cross-section is inserted into the inner ring of the stator 1. At this time, when each coil 15 is energized, the coil 15 is excited and generates a magnetic field. The magnetic flux Φ of the generated magnetic field flows through the magnetic circuit formed by the stator 1. A magnetic circuit formed by the stator 1 is from any tooth portion 12 through the yoke 11 from any tooth portion 12 to the circumferentially adjacent tooth portion 12, and can return to any tooth portion 12 through the space in the hole of the stator 1 ring. As the posture of the rotor 50 changes, the magnetic flux Φ flowing in the magnetic circuit is affected and changes. According to the change of the magnetic flux Φ, the posture change of the rotor 50 can be detected.

[0029] A configuration may also be added to the rotor 50 to make it easier to check the posture change of the rotor 50, that is, the change of the magnetic flux Φ caused by the rotation of the rotor 50. For example, a plurality of regions with different magnetic permeabilities may be formed on the outer circumference of the rotor 50 to which each tooth tip portion 12b faces. In addition, in order to set the air gap to different distances, the rotor 50 may be set to a non-circular shape.

[0030] Generally speaking, the magnetic circuit in the stator is composed of magnetic components. When the magnetic circuit is regarded as a magnetic circuit formed in the stator, the magnetic resistance Rm of the magnetic circuit is determined by the length L of the magnetic circuit, the cross-sectional area S of the magnetic circuit, and the magnetic permeability μ of the components forming the magnetic circuit, as shown below: Rm=L / μS.

[0031] According to the above formula, the thickness of the magnetic material of the magnetic circuit forming part affects the related magnetic resistance Rm. That is, as the thickness of the magnetic component forming the magnetic circuit becomes thicker, the cross-sectional area S of the magnetic circuit 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 a small change in the magnetic flux caused by a small rotation of the rotating body, and the detection accuracy of the resolver is improved.

[0032] Among the materials used in the entire stator, the material cost of the magnetic element is relatively high. Therefore, the thickness of the stator can be reduced according to the detection accuracy of the rotary transformer, thereby reducing the amount of magnetic material used and reducing the manufacturing cost of the stator.

[0033] On the other hand, in each coil wound on the tooth, the thinner the thickness of the tooth, the shorter the coil winding length, and the lower the input impedance. Therefore, the magnetic field strength generated by each coil will weaken. This causes the magnetic flux Φ to become smaller, and the change in magnetic flux Φ caused by the rotor posture change also becomes smaller, thereby reducing the detection accuracy of the resolver.

[0034] Therefore, if the amount of magnetic material used is reduced and the thickness of the stator is thinned in order to reduce manufacturing costs, the input impedance of the coil will decrease and the detection accuracy of the stator will also decrease. However, in the magnetic stator component in which the amount of magnetic material used is reduced in Example 1, since the non-magnetic stator component 30 is stacked on the magnetic stator component 20, the magnetic stator component 20 is made thinner, the input impedance of each coil 15 will not decrease, and the detection accuracy of the rotary transformer using the stator 1 will not decrease.

[0035] In order to further reduce the manufacturing cost and installation cost, the yoke 11 of the stator 1 can adopt an arc structure as a part of a circular ring, for example, a quarter arc, that is, an arc with a central angle of 90°, and the stator 1 with the arc-shaped yoke 11 can be arranged along the outer circumference of the rotor 50 and used as the stator 1 of the rotary transformer, and the rotation angle of the rotor 50 can be detected by arranging the stator 1 along the outer circumference of the rotor 50. This can further reduce the manufacturing cost of the stator 1, and in addition, when detecting the rotation angle of an existing rotating shaft, the arc-shaped stator 1 can be more easily installed on an existing shaft.

[0036] The magnetic stator component 20 and the non-magnetic stator component 30 are stacked in the stator body 10, each coil 15 can be arranged in each tooth portion 12 extending from the yoke 11 in the radial direction toward the inside, and the innermost end of each tooth portion 12 in the radial direction can be arranged to face the rotor 50. Therefore, the air gap between the rotor 50 and the tooth portion 12 can be reduced, and the detection accuracy of the rotary transformer or other sensors using the stator 1 can be improved. The distance between the tooth portion 12 and the yoke 11 can be kept constant. In this way, the leakage flux is not easy to increase, and the detection accuracy will also be improved.

[0037] Since the tooth portion 12 on which each coil 15 is mounted is formed by stacking the magnetic stator component 20 and the non-magnetic stator component 30, the input impedance of the coil 15 can be set to an appropriate value, and the amount of magnetic material used in the magnetic stator component 20 should be adapted to the detection accuracy.

[0038] Therefore, the detection accuracy of the sensor using the stator 1 can be improved while maintaining the amount of magnetic material appropriately. In addition, the amount of magnetic material can be set to an optimal volume by using the magnetic stator component 20 having a volume required according to the required detection accuracy, thereby reducing the manufacturing cost. In addition, since the magnetic stator component 20 and the non-magnetic stator component 30 are a stacked structure, the mechanical strength of the magnetic stator component 20 can be ensured even if the thickness of the magnetic stator component 20 is reduced.

[0039] In the stator 1 of the present embodiment, the thickness of the magnetic stator component 20 and the non-magnetic stator component 30 in the stacking direction are different. In this way, the thickness of the magnetic stator component 20 can be designed according to the magnetic resistance of the magnetic circuit formed in the stator 1. On the other hand, the thickness of the non-magnetic stator component 30 can be designed according to the input impedance of the coil 15 and the mechanical strength of the stator 1. Therefore, the amount of magnetic material in the stator 1 can be reduced, and the detection accuracy of the sensor using the stator 1 can be maintained. In addition, the stator 1 can achieve the required mechanical strength without using a large amount of magnetic material.

[0040] Specifically, the thickness of the magnetic stator component 20 is thinner than that of the non-magnetic stator component 30. Thus, by thickening the non-magnetic stator component 30, necessary mechanical strength can be provided to the stator 1 even in the magnetic stator component 20 because the magnetic stator component 20 is composed of the minimum necessary magnetic components.

[0041] The non-magnetic stator component 30 has a plurality of through holes 30a penetrating in the stacking direction, which can further reduce the weight of the stator 1 and the amount of non-magnetic material used to form the non-magnetic stator component 30, thereby reducing the manufacturing cost.

[0042] Specifically, each through hole 30a is formed at a position corresponding to the yoke 11 of the non-magnetic stator component 30, which can reduce the weight of the non-magnetic stator component 30 and reduce the material of the non-magnetic stator component 30 without significantly reducing the mechanical strength of the non-magnetic stator component 30. Example 2

[0043] Example 2 is a variation of Example 1, except that: Figure 4 As shown, the stator body 10 has two magnetic stator components 20 and two non-magnetic stator components 30, which are alternately stacked.

[0044] In the stacking direction, the non-magnetic stator component 30 is stacked below the magnetic stator component 20 as a whole, and the two wholes are stacked together to form the stator body 10 .

[0045] Specifically, during actual installation, the stator 1 may have two or more magnetic stator components 20 and two or more non-magnetic stator components 30, which are stacked alternately. This can form a uniform magnetic field over a long range along the stacking direction, while reducing the amount of magnetic material used. Therefore, the rotation angle and other physical quantities can be detected at any position along the longitudinal direction of the rotor 50, while reducing the amount of magnetic material used. Example 3

[0046] Example 3 is a variation of Example 1, except that: Figure 5 The stator body 10 has two magnetic stator components 20 and one non-magnetic stator component 30 , forming a superimposed body 40 .

[0047] The stacked body 40 is composed of two magnetic stator components 20 stacked between a non-magnetic stator component 30. In this embodiment, the stator body 10 is composed of a stacked body 40.

[0048] When the magnetic stator component 20 is used as the first component and the non-magnetic stator component 30 is used as the second component, at least one second component is pressed between the two first components, and the magnetic stator component 20 and the non-magnetic stator component 30 are stacked, so that a pair of magnetic stator components 20 can be arranged at appropriate intervals, and physical quantities can be detected at corresponding points of the rotor 50 along the stacking direction, while reducing the increase in the amount of magnetic material used.

[0049] Specifically, the stator body 10 may have two or more magnetic stator components 20 and two or more non-magnetic stator components 30. For example, the stator body 10 may have a stacked body 40, and two stacked non-magnetic stator components 30 are arranged between a pair of magnetic stator components 20. In this way, the spacing between a pair of magnetic stator components 20 can be changed by changing the number of non-magnetic stator components 30, thereby facilitating the manufacture of the stator 1 corresponding to the detection point of the rotor 50. The intensity of the magnetic flux can also be changed by changing the number of magnetic stator components 20, so that the stator 1 can be easily adjusted according to the required detection accuracy. Example 4

[0050] Example 4 is a variation of Example 3, except that: Figure 6 As shown, the stator body 10 has four magnetic stator components 20 and two non-magnetic stator components 30 .

[0051] In the present embodiment, the stator body 10 includes two stacked bodies 40 , but is not limited thereto. For example, the stator body 10 may be formed by stacking three or more stacked bodies 40 .

[0052] In this way, it is easy to predict the characteristics of the stator 1 equipped with a stator body 10 with a continuously stacked superimposed body 40. That is, based on the characteristics of a superimposed body 40 (i.e., a non-magnetic stator component 30 and two magnetic stator components 20, with a non-magnetic stator component 30 in the middle), the characteristics of the stator body 10 with multiple superimposed bodies 40 continuously stacked can be predicted. Therefore, the design cost of the stator 1 can be reduced and the design cycle can be shortened. In addition, multiple superimposed bodies 40 can be manufactured by this method, and the stator body 10 can continuously stack the required number of superimposed bodies 40 as needed. Therefore, the manufacturing cost of the stator body 10 can be reduced and the manufacturing cycle can be shortened. In this way, the stator body 10 can be manufactured at a lower manufacturing cost and a shorter manufacturing cycle. Example 5

[0053] Example 5 is a variation of Example 1, except that: Figure 7 As shown, the stator body 10 has two non-magnetic stator components 30 and one magnetic stator component 20 .

[0054] The stator body 10 has a superimposed body 40, which is composed of two non-magnetic stator parts 30 superimposed between a magnetic stator part 20. The magnetic stator part 20 is protected by being sandwiched between the non-magnetic stator parts 30, and there is no risk of bending or other damage when the magnetic stator part 20 interferes with other parts. Therefore, the magnetic stator part 20 can be made thinner as needed, and even if the magnetic stator part 20 is made thinner, the possibility of damage to the magnetic stator part 20 can be reduced.

[0055] Without limitation thereto, the stator body 10 may have a superimposed body 40 in which two or more magnetic stator components 20 and two or more non-magnetic stator components 30 are stacked together. For example, two laminated magnetic stator components 20 may be stacked between a pair of non-magnetic stator components 30 to form a superimposed body 40. In this way, the intensity of the magnetic flux can be changed by adjusting and changing the number of magnetic stator components 20 and the design of the stator 1 according to the required detection accuracy. The stator 1 can be relatively easily designed and manufactured according to the required detection accuracy. For example, a magnetic stator component 20 can be sandwiched between two stacked non-magnetic stator components 30 to form a superimposed body 40. That is, the superimposed body 40 may have two non-magnetic stator components 30, one magnetic stator component 20 and two non-magnetic stator components 30 stacked in sequence. This can prevent the input impedance of each coil 15 from being reduced. Therefore, the stator 1 can be easily manufactured according to the input impedance of each coil 15. Example 6

[0056] Example 6 is a variation of Example 5, except that: Figure 8 As shown, the stator body 10 has four non-magnetic stator components 30 and two magnetic stator components 20 .

[0057] When a magnetic stator component 20 is stacked between two non-magnetic stator components 30 as a stacked body 40, the stator body 10 includes two continuously stacked stacked bodies 40. Without being limited thereto, for example, three or more stacked bodies 40 may be continuously stacked to form the stator body 10.

[0058] In this way, it is easy to predict the characteristics of the stator body 10 in which one superimposed body 40 is stacked continuously. That is, according to the characteristics of the superimposed body 40 in which one magnetic stator component 20 is stacked between two non-magnetic stator components 30. According to the characteristics of the stator body 10 in which a plurality of superimposed bodies 40 are stacked continuously, it can be easily foreseen. Therefore, the design cost of the stator 1 can be reduced and the design cycle can be shortened. In addition, this makes it possible to manufacture the stator body 10 by manufacturing a plurality of superimposed bodies 40 and continuously stacking the required number of superimposed bodies 40 when necessary, thereby achieving a reduction in the manufacturing cost of the stator body 10 and a shortening of the manufacturing cycle. Example 7

[0059] Example 7 is a variation of Example 1, except that: Fig. 9 As shown, the outer shape of the non-magnetic stator component 30 is different from the outer shape of the magnetic stator component 20 . Fig. 9 A schematic diagram of a non-magnetic stator component 30 is shown.

[0060] A plurality of grooves 30 b are formed on the outer periphery of the non-magnetic stator member 30 when viewed along the central axis L. The grooves 30 b are formed on a portion corresponding to the outer edge of the yoke 11 of the stator body 10 and on a surface facing the rotor 50 .

[0061] The groove 30 b is not formed entirely in a portion corresponding to the outer edge of the yoke portion 11 of the stator body 10 . The groove 30 b is not formed in a portion corresponding to the coil mounting portion 12 a of the tooth portion 12 of the stator body 10 .

[0062] The groove 30 b can reduce the weight of the non-magnetic stator component 30 , thereby reducing the weight of the stator 1 . In addition, the non-magnetic stator component 30 can be manufactured using less material, which can reduce the manufacturing cost of the non-magnetic stator component 30 .

[0063] The groove 30b is not formed on the entire circumference of the portion of the groove 30b corresponding to the outer circumferential edge of the yoke 11 of the stator body 10. This means that the magnetic stator component 20 and the non-magnetic stator component 30 are stacked together in the portion corresponding to the outer circumferential edge of the yoke 11 of the stator body 10. Therefore, the magnetic stator component 20 is supported by the non-magnetic stator component 30 at the portion corresponding to the outer circumferential edge of the yoke 11 of the stator body 10, and the required strength is maintained. Therefore, the possibility of the magnetic stator component 20 being damaged at the outer circumferential edge of the yoke 11 of the stator body 10 is reduced.

[0064] The groove 30b is not formed in the portion corresponding to the coil mounting portion 12a of the tooth portion 12 of the stator body 10. This means that even if the coil 15 is wound on the coil mounting portion 12a, the magnetic stator component 20 is supported by the non-magnetic stator component 30, thereby maintaining the required strength. Therefore, the possibility of damage to the portion of the magnetic stator component 20 corresponding to the coil mounting portion 12a in the tooth portion 12 of the stator body 10 can be reduced.

[0065] The groove 30b is not formed at the end of the tooth tip portion 12b of the tooth portion 12 of the stator body 10. This means that the magnetic stator component 20 corresponding to the end of the tooth tip portion 12b of the tooth portion 12 of the stator body 10 is supported by the non-magnetic stator component 30, which maintains the required strength. Therefore, the possibility of damage to the magnetic stator component 20 at the portion corresponding to the end of the tooth tip portion 12b of the tooth portion 12 of the stator body 10 can be reduced.

[0066] The outer shape of a portion of the non-magnetic stator component 30 excluding the groove 30 b is the same as the outer shape of a corresponding portion of the magnetic stator component 20 .

[0067] Alternatively, the outer contour of the non-magnetic stator component 30 may be larger than the outer contour of the magnetic stator component 20. When the stator 1 interferes with another object, the non-magnetic stator component 30 interferes with the object first, which can further reduce the possibility of damage to the magnetic stator component 20.

[0068] In addition, the protruding non-magnetic outer shape ensures that the magnetic coil maintains a certain distance from the motor coil, reducing external magnetic flux interference.

[0069] The non-magnetic stator component 30 may have a plurality of through holes 30 a and a plurality of grooves 30 b at the same time, so as to further reduce the weight of the non-magnetic stator component 30 and lower the manufacturing cost. Example 8

[0070] The magnetic stator component 20 in the eighth embodiment is different from the stator 1 in the first embodiment. Fig.10 As shown, it is composed of a plurality of magnetic stator sheets 25 connected together.

[0071] Each magnetic stator piece 25 includes a magnetic tooth portion 26 corresponding to the tooth portion 12 of the stator body 10 and a yoke portion 27 corresponding to a portion of the yoke portion 11 .

[0072] A magnetic protrusion 25a is formed at one end of the yoke portion 27 in the circumferential direction of each magnetic stator segment 25, and a magnetic groove 25b is formed at the other end opposite thereto. When the magnetic stator segments 25 are connected together, the magnetic protrusion 25a of one magnetic stator segment 25 is connected to the magnetic groove 25b of another magnetic stator segment 25, and the two magnetic stator segments 25 are connected to each other in this way. A plurality of magnetic stator segments 25 are connected to form a circle or an arc, constituting a magnetic stator component 20.

[0073] Therefore, no waste will be caused when cutting the magnetic stator sheets 25, thereby reducing the production cost.

[0074] The connection mechanism of the magnetic stator piece 25 is not limited to the magnetic protrusion 25a and the magnetic groove 25b in this embodiment, and a configuration known in the prior art can be adopted. Example 9

[0075] The non-magnetic stator component 30 in the ninth embodiment is different from the stator 1 in the first embodiment. Fig.11 As shown, it is composed of a plurality of non-magnetic stator sheets 35 connected together.

[0076] Each nonmagnetic stator piece 35 includes a nonmagnetic tooth portion 36 corresponding to the tooth portion 12 of the stator body 10 and a nonmagnetic yoke portion 37 .

[0077] Each nonmagnetic stator piece 35 has a nonmagnetic protrusion 35a at one end in the circumferential direction of the nonmagnetic yoke portion 37 and a nonmagnetic groove 35b at the other opposite end. The two nonmagnetic stator pieces 35 are connected to each other by connecting the nonmagnetic protrusion 35a of one nonmagnetic stator piece 35 to the nonmagnetic groove 35b of the other nonmagnetic stator piece 35.

[0078] A plurality of non-magnetic stator segments 35 are connected together to form a circle or an arc, thereby forming a non-magnetic stator component 30 .

[0079] In this way, there is no need to increase the size of the mold and resin molding equipment required for the resin molding material, and there is no need to produce large non-magnetic stator components 30, so the manufacturing cost of the non-magnetic stator components 30 can be reduced. Compared with storing the large non-magnetic stator components 30 that have been produced, the storage area can be reduced, thereby reducing the storage cost of the components.

[0080] The stator 1 can also be manufactured using the magnetic stator sheets 25 in Example 8 and the non-magnetic stator sheets 35 in Example 9. In this case, the magnetic stator sheets 25 and the corresponding non-magnetic stator sheets 35 are first stacked. Then, the coil 15 is installed at a position corresponding to the tooth portion 12. The stator 1 can be manufactured by connecting a plurality of intermediate products in which the magnetic stator sheets 25 and the non-magnetic stator sheets 35 on which the coil 15 is installed are stacked together. This manufacturing process facilitates the installation of the coil 15 and reduces the manufacturing cost.

[0081] The connection mechanism of the non-magnetic stator piece 35 is not limited to the non-magnetic protrusion 35a and the non-magnetic groove 35b in this embodiment, and a configuration known in the prior art may be adopted.

Claims

1. A stator, characterized in that: It comprises a stator body (10) and a coil (15); The stator body (10) comprises a yoke (11) and a tooth (12); the yoke (11) is a circular ring or a circular arc that is a part of a circular ring; the tooth (12) extends from the yoke (11) toward the inner radial direction of the circular ring; the coil (15) is wound around each tooth (12); The stator body (10) comprises a plurality of magnetic stator components (20) and a plurality of non-magnetic stator components (30), wherein the magnetic stator components (20) and the non-magnetic stator components (30) are stacked axially; The thickness of the magnetic stator component (20) in the stacking direction is thinner than the thickness of the non-magnetic stator component (30).

2. The stator according to claim 1, characterized in that: The axial outer contour of the magnetic stator component (20) is smaller than the axial outer contour of the non-magnetic stator component (30).

3. The stator according to claim 1 or 2, characterized in that: The non-magnetic stator component (30) has one or more through holes (30a) in the stacking direction.

4. The stator according to claim 3, characterized in that: Each of the through holes (30a) is formed at a position corresponding to the yoke (11).

5. The stator according to claim 1, 2 or 4, characterized in that: The magnetic stator components (20) and the non-magnetic stator components (30) are stacked alternately.

6. The stator according to claim 1, 2 or 4, characterized in that: The stator body (10) comprises a superimposed body (40), wherein the superimposed body (40) is formed by laminating at least two magnetic stator components (20) with at least one non-magnetic stator component (30), or by laminating at least two non-magnetic stator components (30) with at least one magnetic stator component (20).

7. The stator according to claim 6, characterized in that: The stator body (10) is formed by stacking two or more superimposed bodies (40).

8. The stator according to claim 1 or 2 or 4 or 7, characterized in that: Each of the magnetic stator components (20) is formed by connecting a plurality of magnetic stator sheets (25); each magnetic stator sheet (25) forms a magnetic tooth portion (26) corresponding to the tooth portion (12) and a magnetic yoke portion (27) corresponding to a portion of the yoke portion (11).

9. The stator according to claim 1 or 2 or 4 or 7, characterized in that: Each of the non-magnetic stator components (30) is formed by connecting a plurality of non-magnetic stator sheets (35); each non-magnetic stator sheet (35) forms a non-magnetic tooth portion (36) corresponding to the tooth portion (12) and a non-magnetic yoke portion (37) corresponding to a portion of the yoke portion (11).

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