A stator

Abstract

The present invention discloses a stator comprising a stator body and a coil. The stator body comprises a yoke and teeth, wherein the yoke is a circular ring or a circular arc that is a portion of a circular ring. The teeth extend from the yoke toward the inner radial direction of the circular ring. The coil is wound around each tooth. The stator body comprises a plurality of magnetic stator components and a plurality of non-magnetic stator components, wherein the magnetic and non-magnetic stator components are stacked axially. The thickness of the magnetic stator components in the stacking direction is thinner than that of the non-magnetic stator components. The present invention reduces costs while meeting detection accuracy requirements, and significantly improves detection accuracy while minimizing cost increases. The stator structure can be easily adjusted according to detection accuracy requirements, making it easier to manufacture a stator corresponding to the rotor detection points.

Description

Technical Field

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

[0002] In conventional resolvers, the stator utilizes a monolithic magnetic stator component stacked axially, with coils wound around the stator teeth. The stacked thickness of the magnetic stator component determines the coil winding length, which in turn determines the input impedance, ultimately affecting the resolver's detection accuracy. To ensure detection accuracy, existing designs often prioritize ensuring an effective coil winding length. In this case, the amount of magnetic stator component used is relatively fixed. The thicker the magnetic material in the stator, the higher the resolver's detection accuracy. However, given the relatively high cost of magnetic materials and the fact that not all resolvers require such high detection accuracy, this results in wasted resources and increased costs. Furthermore, the detection accuracy of such a resolver is relatively fixed. Furthermore, the monolithic magnetic stator component is not conducive to production, storage, and installation, resulting in increased costs. Furthermore, because the stator's outer contour has uniform axial dimensions, it lacks effective physical protection against external interference. Furthermore, if the motor's coils are too close to the resolver stator, the magnetic flux generated by the motor can flow into the resolver coils, causing 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 includes a stator body and a coil;

[0005] The stator body comprises 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 toward the inner radial direction of the circular ring; and the coil is wound around each tooth portion;

[0006] The stator body has a plurality of magnetic stator components and a plurality of non-magnetic stator components, wherein the magnetic stator components and the non-magnetic stator components are axially stacked;

[0007] The thickness of the magnetic stator component in the stacking direction is thinner than the thickness of the non-magnetic stator component.

[0008] Furthermore, the axial outer contour of the magnetic stator component is smaller than the axial outer contour of the non-magnetic stator component.

[0009] Furthermore, the non-magnetic stator component has one or more through holes in the stacking direction.

[0010] Furthermore, each of the through holes is formed at a position corresponding to the yoke.

[0011] Furthermore, the magnetic stator components and the non-magnetic stator components are stacked alternately.

[0012] Furthermore, the stator body has a superimposed body, wherein the superimposed body is formed by laminating at least two magnetic stator components with at least one non-magnetic stator component, or by laminating at least two non-magnetic stator components with at least one magnetic stator component.

[0013] Furthermore, the stator body is formed by stacking two or more superimposed bodies.

[0014] 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.

[0015] 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.

[0016] Beneficial effects: Compared with the prior art, the advantages of the present invention are:

[0017] While meeting the detection accuracy, reduce the cost, while minimizing the cost, greatly improve the detection accuracy;

[0018] 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;

[0019] 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;

[0020] Can reduce stator physical interference and external electromagnetic interference;

[0021] The structure of axial stacking and circumferential multi-piece connection can reduce manufacturing costs and cycles, and facilitate storage and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the overall structure of the stator in Example 1;

[0023] Figure 2 Schematic diagram of the local structure of the stator in Example 1;

[0024] Figure 3 for Figure 1 Cross-sectional view at III-III;

[0025] Figure 4is a cross-sectional view of the stator body in Example 2;

[0026] Figure 5 is a cross-sectional view of the stator body in Example 3;

[0027] Figure 6 This is a cross-sectional view of the stator body in Example 4;

[0028] Figure 7 is a cross-sectional view of the stator body in Example 5;

[0029] Figure 8 is a cross-sectional view of the stator body in Example 6;

[0030] Figure 9 Schematic diagram of the structure of the non-magnetic stator component in Example 7;

[0031] Figure 10 Schematic diagram of the structure of the magnetic stator component in Example 8;

[0032] Figure 11 This is a schematic diagram of the structure of the non-magnetic stator component in Example 9. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments. Example 1

[0034] like Figure 1-3 The figure shows a stator 1 for a rotary transformer or a torque sensor. The stator 1 is in the shape of a ring with a central axis L. A rotor 50 is arranged in the central opening of the stator 1. The stator 1 and the rotor 50 share 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.

[0035] The stator 1 is composed of a stator body 10 and a plurality of coils 15 .

[0036] In this embodiment, 14 coils 15 are used.

[0037] The stator body 10 includes a yoke 11 having 14 teeth 12 extending radially from the yoke 11. Each coil 15 is disposed on each tooth 12. The axis passing through the center of the yoke 11 coincides with the central axis L.

[0038] The teeth 12 include a coil mounting portion 12a extending radially inward from the yoke 11, and tooth tips 12b located at the radial ends of the coil mounting portion 12a. The tooth tips 12b are wider than the coil mounting portion 12a. The coil mounting portions 12a are circumferentially spaced apart within the inner circumference of the yoke 11. The inner ends of the tooth tips 12b are arc-shaped, and all tooth tips 12b are located on the same circumference in an axial perspective. When the rotor 50 is placed within the stator 1, each tooth tip 12b forms an air gap with the rotor 50.

[0039] The coil 15 is wound around the coil mounting portion 12 a of each tooth portion 12 .

[0040] 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 .

[0041] like Figure 3 As 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.

[0042] 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; the non-magnetic stator component 30 is made of non-magnetic material, which may be non-magnetic stainless steel, aluminum or resin.

[0043] 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.

[0044] The thickness of the magnetic stator component 20 is thinner than that of the non-magnetic stator component 30 .

[0045] 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 this 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.

[0046] like Figure 1As described above, 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 portion 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 in the circular ring of the stator 1. 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 in the magnetic flux Φ, the posture change of the rotor 50 can be detected.

[0047] A configuration may also be added to the rotor 50 to facilitate detection of changes in the rotor 50's posture, specifically changes in the magnetic flux Φ caused by the rotation of the rotor 50. For example, multiple regions with different magnetic permeabilities may be formed on the outer circumference of the rotor 50, which faces each tooth tip 12b. Furthermore, the rotor 50 may be configured in a non-circular shape to allow for varying air gap distances.

[0048] Generally speaking, the magnetic circuit in a stator is composed of magnetic components. When the magnetic circuit is considered to be a magnetic path 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.

[0049] According to the above formula, the thickness of the magnetic material forming the magnetic path affects the associated reluctance Rm. Specifically, as the thickness of the magnetic component forming the magnetic path increases, the cross-sectional area S of the magnetic path increases, and the reluctance Rm decreases. If the reluctance Rm of the magnetic path decreases, the resolver used in the stator can detect even minute changes in the magnetic flux caused by the slightest rotation of the rotating body, thereby improving the resolver's detection accuracy.

[0050] Among the materials used in the entire stator, the material cost of the magnetic components is relatively high. Therefore, the thickness of the stator can be reduced according to the detection accuracy of the resolver, thereby reducing the amount of magnetic material used and thus reducing the manufacturing cost of the stator.

[0051] On the other hand, thinner teeth and shorter coil winding lengths in each coil wound around a tooth reduce the input impedance. Consequently, the magnetic field intensity generated by each coil weakens. This reduces the magnetic flux Φ, and the change in magnetic flux Φ caused by rotor posture changes also decreases, reducing the resolver's detection accuracy.

[0052] Therefore, if the amount of magnetic material used is reduced and the stator thickness is thinned to reduce manufacturing costs, the input impedance of the coils will decrease, and the detection accuracy of the stator will also be reduced. However, in the magnetic stator component of Example 1, in which the amount of magnetic material used is reduced, the non-magnetic stator component 30 is laminated on the magnetic stator component 20, so the magnetic stator component 20 is made thinner. This does not reduce the input impedance of each coil 15, nor does it reduce the detection accuracy of the resolver using the stator 1.

[0053] To further reduce manufacturing and installation costs, the yoke 11 of the stator 1 can have an arc structure that is a portion of a circular ring. For example, a quarter-circular arc, i.e., an arc with a central angle of 90°, can be used. 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 a rotary transformer. By arranging the stator 1 along the outer circumference of the rotor 50, the rotation angle of the rotor 50 can be detected. This can further reduce the manufacturing cost of the stator 1. 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.

[0054] 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 12 extending radially inward from the yoke 11, and the innermost end of each tooth 12 in the radial direction can be arranged to face the rotor 50. As a result, the air gap between the rotor 50 and the tooth 12 can be reduced, improving the detection accuracy of a rotary transformer or other sensor using the stator 1. The distance between the tooth 12 and the yoke 11 can be maintained constant. This reduces the risk of increased leakage flux and improves detection accuracy.

[0055] 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.

[0056] Therefore, while maintaining an appropriate amount of magnetic material, the detection accuracy of sensors using stator 1 can be improved. Furthermore, by using a magnetic stator component 20 with a volume that matches the required detection accuracy, the amount of magnetic material can be optimized, thereby reducing manufacturing costs. Furthermore, because the magnetic stator component 20 and the non-magnetic stator component 30 are laminated, the mechanical strength of the magnetic stator component 20 can be maintained even if the thickness of the magnetic stator component 20 is reduced.

[0057] In the stator 1 of this embodiment, the magnetic stator component 20 and the non-magnetic stator component 30 have different thicknesses in the stacking direction. This allows the thickness of the magnetic stator component 20 to be designed based on 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 based on the input impedance of the coil 15 and the mechanical strength of the stator 1. This reduces the amount of magnetic material used in the stator 1 while maintaining the detection accuracy of sensors using the stator 1. Furthermore, the stator 1 can achieve the required mechanical strength without using a large amount of magnetic material.

[0058] 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, the 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.

[0059] The non-magnetic stator component 30 has a plurality of through holes 30 a extending 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 manufacturing costs.

[0060] 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

[0061] Example 2 is a modified example of Example 1, the difference being 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.

[0062] 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 .

[0063] Specifically, during actual installation, the stator 1 can consist of two or more magnetic stator components 20 and two or more non-magnetic stator components 30, stacked alternately. This creates a uniform magnetic field over a long range along the stacking direction while reducing the amount of magnetic material used. Consequently, the rotation angle and other physical quantities can be detected at any position along the longitudinal direction of the rotor 50, while also reducing the amount of magnetic material used. Example 3

[0064] Example 3 is a modified example of Example 1, except that Figure 5The stator body 10 has two magnetic stator parts 20 and one non-magnetic stator part 30 , forming a superimposed body 40 .

[0065] 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 one stacked body 40.

[0066] When the magnetic stator component 20 serves as the first component and the non-magnetic stator component 30 serves 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. Therefore, a pair of magnetic stator components 20 can be arranged at appropriate intervals, and physical quantities can be detected at corresponding points on the rotor 50 along the stacking direction, while reducing the increase in the amount of magnetic material used.

[0067] Specifically, the stator body 10 may include two or more magnetic stator components 20 and two or more non-magnetic stator components 30. For example, the stator body 10 may include a stacked body 40 with two stacked non-magnetic stator components 30 disposed between a pair of magnetic stator components 20. In this manner, the spacing between the pair of magnetic stator components 20 can be varied by changing the number of non-magnetic stator components 30, thereby facilitating the manufacture of the stator 1 corresponding to the detection points of the rotor 50. The intensity of the magnetic flux can also be varied by changing the number of magnetic stator components 20, making it easy to adjust the stator 1 according to the desired detection accuracy. Example 4

[0068] Example 4 is a modified example 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 .

[0069] In this embodiment, the stator body 10 includes two stacked bodies 40 that are stacked continuously, but is not limited thereto. For example, the stator body 10 may be constructed by stacking three or more stacked bodies 40 continuously.

[0070] This makes it easy to predict the characteristics of a stator 1 equipped with a stator body 10 composed of a series of stacked bodies 40. In other words, based on the characteristics of a single stacked body 40 (i.e., a non-magnetic stator component 30 and two magnetic stator components 20, with a non-magnetic stator component 30 in between), the characteristics of a stator body 10 composed of multiple stacked bodies 40 can be predicted. Consequently, the design cost of the stator 1 can be reduced, and the design cycle can be shortened. Furthermore, this method can be used to manufacture multiple stacked bodies 40, allowing the stator body 10 to continuously stack the required number of stacked bodies 40 as needed. Consequently, the manufacturing cost of the stator body 10 can be reduced, and the manufacturing cycle can be shortened. This allows the stator body 10 to be manufactured at a lower cost and in a shorter manufacturing cycle. Example 5

[0071] Example 5 is a modified example 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 .

[0072] The stator body 10 has a stacked body 40 composed of two non-magnetic stator components 30 stacked between a magnetic stator component 20. The magnetic stator component 20 is protected by being sandwiched between the non-magnetic stator components 30, eliminating the risk of bending or other damage when the magnetic stator component 20 interferes with other components. Therefore, the magnetic stator component 20 can be made thinner as needed, and even with this thinning, the likelihood of damage to the magnetic stator component 20 is reduced.

[0073] Without limitation, the stator body 10 may comprise a stacked 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 stacked magnetic stator components 20 may be stacked between a pair of non-magnetic stator components 30 to form the stacked body 40. This allows the intensity of the magnetic flux to be varied by adjusting and varying the number of magnetic stator components 20 and the design of the stator 1, depending on the desired detection accuracy. The stator 1 can be relatively easily designed and manufactured to suit the desired detection accuracy. For example, a single magnetic stator component 20 may be sandwiched between two stacked non-magnetic stator components 30 to form a stacked body 40. In other words, the stacked body 40 may comprise two non-magnetic stator components 30, a single magnetic stator component 20, and two non-magnetic stator components 30 stacked in sequence. This prevents a decrease in the input impedance of each coil 15. Consequently, the stator 1 can be easily manufactured based on the input impedance of each coil 15. Example 6

[0074] Example 6 is a modified example of Example 5, except that Figure 8As shown, the stator body 10 has four non-magnetic stator components 30 and two magnetic stator components 20 .

[0075] 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. However, the present invention is not limited thereto. For example, three or more stacked bodies 40 may be continuously stacked to form the stator body 10.

[0076] In this way, it is easy to predict the characteristics of the stator body 10 in which one superimposed body 40 is stacked continuously. In other words, the characteristics of the superimposed body 40 in which one magnetic stator component 20 is stacked between two non-magnetic stator components 30 can be easily predicted. The characteristics of the stator body 10 in which multiple superimposed bodies 40 are stacked continuously can be easily predicted. 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 multiple superimposed bodies 40 and continuously stacking the required number of superimposed bodies 40 when necessary, thereby reducing the manufacturing cost of the stator body 10 and shortening the manufacturing cycle. Example 7

[0077] Example 7 is a modified example of Example 1, except that Figure 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 . Figure 9 A schematic diagram of a non-magnetic stator component 30 is shown.

[0078] 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 in portions corresponding to the outer edge of the yoke 11 of the stator body 10 and in a surface facing the rotor 50 .

[0079] The groove 30b is not formed entirely in a portion corresponding to the outer edge of the yoke portion 11 of the stator body 10. The groove 30b is not formed in a portion corresponding to the coil mounting portion 12a of the teeth portion 12 of the stator body 10.

[0080] The grooves 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 .

[0081] The grooves 30b are not formed along the entire circumference of the portion 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 in the portion corresponding to the outer circumferential edge of the yoke 11 of the stator body 10, maintaining the required strength. Consequently, the possibility of damage to the magnetic stator component 20 at the outer circumferential edge of the yoke 11 of the stator body 10 is reduced.

[0082] The grooves 30b are not formed in the portion of the stator body 10 corresponding to the coil mounting portion 12a of the teeth 12. This means that even when the coil 15 is wound around 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 teeth 12 of the stator body 10 can be reduced.

[0083] The grooves 30b are not formed at the ends of the tooth tips 12b of the teeth 12 of the stator body 10. This means that the magnetic stator component 20 corresponding to the ends of the tooth tips 12b of the teeth 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 ends corresponding to the tooth tips 12b of the teeth 12 of the stator body 10 can be reduced.

[0084] The outer shape of the portion of the non-magnetic stator component 30 excluding the groove 30 b is the same as the outer shape of the corresponding portion of the magnetic stator component 20 .

[0085] 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.

[0086] 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.

[0087] The non-magnetic stator component 30 may have a plurality of through holes 30 a and a plurality of grooves 30 b , thereby further reducing the weight of the non-magnetic stator component 30 and lowering the manufacturing cost. Example 8

[0088] The magnetic stator component 20 in the eighth embodiment is different from the stator 1 in the first embodiment. Figure 10 As shown, it is composed of a plurality of magnetic stator sheets 25 connected together.

[0089] Each magnetic stator piece 25 includes 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 portion of the yoke 11 .

[0090] Each magnetic stator segment 25 has a magnetic protrusion 25a formed at one circumferential end of the yoke portion 27, and a magnetic groove 25b formed at the opposite end. When the magnetic stator segments 25 are connected together, the magnetic protrusion 25a of one segment 25 is connected to the magnetic groove 25b of another segment 25, thereby connecting the two segments 25 to each other. Multiple magnetic stator segments 25 are connected to form a circular or arc-shaped structure, forming the magnetic stator assembly 20.

[0091] In this way, no waste is caused when cutting the magnetic stator sheets 25 , thereby reducing production costs.

[0092] The connection mechanism of the magnetic stator piece 25 is not limited to the magnetic protrusion 25 a and the magnetic groove 25 b in this embodiment, and any configuration known in the prior art may be used. Example 9

[0093] The non-magnetic stator component 30 in embodiment 9 is different from the stator 1 in embodiment 1. Figure 11 As shown, it is composed of a plurality of non-magnetic stator sheets 35 connected together.

[0094] Each non-magnetic stator piece 35 includes a non-magnetic tooth portion 36 corresponding to the tooth portion 12 of the stator body 10 and a non-magnetic yoke portion 37 .

[0095] Each nonmagnetic stator piece 35 has a nonmagnetic protrusion 35a at one circumferential end of the nonmagnetic yoke portion 37 and a nonmagnetic groove 35b at the 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.

[0096] 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 .

[0097] 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, which can reduce the manufacturing cost of the non-magnetic stator components 30. Compared with storing the large non-magnetic stator components 30 that have already been produced, the storage area can also be reduced, thereby reducing the storage cost of the components.

[0098] The stator 1 can also be manufactured using the magnetic stator segments 25 of Example 8 and the non-magnetic stator segments 35 of Example 9. In this case, the magnetic stator segments 25 and the corresponding non-magnetic stator segments 35 are first stacked. Then, the coils 15 are installed at positions corresponding to the teeth 12. The stator 1 can be manufactured by connecting multiple intermediate products in which the magnetic stator segments 25 and the non-magnetic stator segments 35 on which the coils 15 are installed are stacked together. This manufacturing process facilitates the installation of the coils 15 and reduces manufacturing costs.

[0099] The connection mechanism of the non-magnetic stator piece 35 is not limited to the non-magnetic protrusion 35 a and the non-magnetic groove 35 b of this embodiment, and a configuration known in the prior art may be adopted.

Claims

1. A stator, characterized in that: A rotary transformer or a torque sensor comprising a stator body (10) and a coil (15); The stator body (10) has a yoke (11) and a tooth (12), wherein 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; and the coil (15) is wound around each tooth (12); The stator body (10) has 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); The axial outer contour of the magnetic stator component (20) is smaller than the axial outer contour of the non-magnetic stator component (30).

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

3. The stator according to claim 2, characterized in that: Each of the through holes (30a) is formed at a position corresponding to the yoke (11).

4. The stator according to claim 1 or 3, characterized in that: The magnetic stator components (20) and the non-magnetic stator components (30) are stacked alternately.

5. The stator according to claim 1 or 3, characterized in that: The stator body (10) has a superimposed body (40), wherein the superimposed body (40) is at least two magnetic stator components (20) laminated with at least one non-magnetic stator component (30), or at least two non-magnetic stator components (30) laminated with at least one magnetic stator component (20).

6. The stator according to claim 5, characterized in that: The stator body (10) is formed by stacking two or more superimposed bodies (40).

7. The stator according to claim 1, 3 or 6, 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).

8. The stator according to claim 1, 3 or 6, 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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