A resolver rotor

Abstract

The utility model provides a kind of rotary transformer rotor, it includes: lamination, lamination is formed by the staggered lamination of multiple punching sheet, each punching sheet is equipped with mounting hole, recess and protrusion cooperation is formed positioning on the lamination of each punching sheet It is equipped with rivet mouth, the outer edge of each punching sheet is equipped with magnetic conducting surface;Shaft, shaft is worn in mounting hole to make each punching sheet be in coaxial state, recess and protrusion cooperation between shaft and mounting hole to limit the relative rotation of shaft and each punching sheet in circumferential direction;Two shaft sleeves, two shaft sleeves are correspondingly sleeved on the shaft of lamination both ends and are welded with shaft, to limit the relative movement between lamination and shaft in axial direction.The rotary transformer rotor structure is stable, simple to assemble, can guarantee the stability of sensor electromagnetic characteristic.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and specifically to a rotary transformer rotor. Background Technology

[0002] The rotor of the existing rotary transformer (RVDT angular displacement sensor) mainly consists of a rotating shaft, a rotor core, and a bushing. The rotor core and bushing are fixedly connected to the rotating shaft by adhesive bonding. Given the following obvious disadvantages of the bonding method: (1) Temperature sensitivity: The performance of the adhesive is significantly affected by temperature. High temperature may cause the adhesive layer to soften or decompose, reducing the structural strength; low temperature may cause the adhesive layer to become brittle, increasing the risk of cracking. This lack of thermal stability will seriously affect the reliability of the sensor in a wide temperature environment; (2) Long-term aging problem: The adhesive may age and become brittle over time, resulting in a decrease in bonding strength and loss of adhesion. This will cause the stack to loosen. The loosening of the stack may cause changes in the air gap, affecting the stability of the electromagnetic characteristics of the sensor; (3) Poor process consistency: Parameters such as adhesive layer thickness and curing uniformity are difficult to control precisely. Small deviations may cause uneven stress distribution between the stacks, resulting in dynamic imbalance or local deformation of the rotor, affecting the measurement accuracy; (4) Insufficient mechanical strength: Compared with welding or riveting, the mechanical strength of bonding is lower. Under high speed, vibration or impact load, the stack may delaminate or shift, resulting in signal drift or failure; (5) Long production cycle: The long curing time (especially structural adhesives) prolongs the production cycle. Therefore, it is necessary to improve the rotor of the rotary transformer. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in the aforementioned technologies. Therefore, the purpose of this invention is to provide a rotary transformer rotor that has a stable structure, is simple to assemble, and can ensure the stability of the electromagnetic characteristics of the sensor.

[0004] To achieve the above objectives, this utility model proposes a rotary transformer rotor, comprising:

[0005] The stacked pieces are formed by staggered stacking of multiple stamped pieces. Each stamped piece is provided with mounting holes and rivet openings on the stacked surface of each stamped piece. Adjacent stamped pieces are positioned and fitted together by the concave and convex fit of the rivet openings. Each stamped piece has a magnetic conductive surface on its outer edge.

[0006] A rotating shaft passes through the mounting hole to keep each of the punches coaxial. The rotating shaft and the mounting hole have a concave-convex fit to restrict the relative rotation between the rotating shaft and each of the punches in the circumferential direction.

[0007] Two bushings are fitted onto the rotating shafts at both ends of the stacked pieces and welded to the rotating shafts to restrict relative movement between the stacked pieces and the rotating shafts in the axial direction.

[0008] According to an embodiment of the present invention, a rotary transformer rotor is formed by riveting between laminations to make adjacent laminations fit together and be positioned. The circumferential positioning between the laminations and the rotating shaft is achieved by the concave-convex fit between the rotating shaft and the mounting holes of the laminations. Then, the two ends of the stacked laminations are abutted and restricted by the bushing and welded to the rotating shaft, thereby ensuring the stability of the circumferential and axial connections between the laminations and between the laminations and the rotating shaft. Its structure is stable, its assembly is simple, and it can ensure the stability of the electromagnetic characteristics of the sensor.

[0009] In addition, the rotary transformer rotor proposed according to the above embodiments of this utility model may also have the following additional technical features:

[0010] Optionally, the rotating shaft has a protrusion arranged along its axial direction, and the mounting hole has a recess that matches the protrusion.

[0011] Optionally, the central angle of the magnetically conductive surface is 90°.

[0012] Optionally, the rivet opening is arched.

[0013] Optionally, each of the said laminations has a marking groove on its outer edge for reference to the misaligned stacking.

[0014] Optionally, the lamination is arranged in an umbrella shape.

[0015] Optionally, the mounting hole and the rotating shaft are interference fit.

[0016] Optionally, the protrusion height of the rivet is greater than the thickness of the lamination.

[0017] Optionally, the rotating shaft includes a middle section, the stacked plates are mounted on the middle section, and annular clearance grooves are provided at both ends of the middle section. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the rotor structure of a rotary transformer according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the rotating shaft according to an embodiment of the present utility model;

[0020] Figure 3 for Figure 2 A structural diagram from another perspective;

[0021] Figure 4 This is a schematic diagram of the structure of the lamination according to an embodiment of the present utility model;

[0022] Figure 5 for Figure 4 A structural diagram from another perspective;

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Laminated sheet 11. Mounting hole 111. Rivet 112. Magnetic conductive surface 113. Recessed part 114. Marking groove 115. Rotating shaft 2. Middle section 21. Protrusion 211. Front section 22. Rear section 23. Relief groove 24. Bushing 3. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0027] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0028] The following is for reference. Figure 1-5 The implementation of the rotary transformer rotor according to the embodiments of the present invention will be described in detail.

[0029] The rotary transformer rotor according to an embodiment of the present invention includes:

[0030] The stack 1 is formed by multiple stamps 11 stacked in a staggered manner. Each stamp 11 is provided with mounting holes 111 and each stamp 11 is provided with rivet openings 112 on the stacked surface. Adjacent stamps 11 are positioned and fitted by the concave and convex fit of the rivet openings 112. Each stamp 11 is provided with a magnetic conductive surface 113 on its outer edge.

[0031] A rotating shaft 2 is inserted through a mounting hole 111 to keep each piece 11 coaxial. The rotating shaft 2 and the mounting hole 111 are fitted together to restrict the relative rotation of the rotating shaft 2 and each piece 11 in the circumferential direction.

[0032] Two bushings 3 are fitted onto the rotating shafts 2 at both ends of the stacked plate 1 and welded to the rotating shafts 2 to restrict relative movement between the stacked plate 1 and the rotating shafts 2 in the axial direction.

[0033] In other words, the stacked piece 1 is formed by stacking and riveting several pieces 11. Adjacent pieces 11 are fitted and positioned together by riveting holes 112. The pieces 11 can be pre-stamped with mounting holes 111, magnetic conductive surfaces 113, and riveting holes 112 using a stamping device. Then, the pieces 11 are pressed one by one onto the rotating shaft 2 using a riveting device. The riveting device can be equipped with protrusions that match the riveting holes 112 to press the next piece 11 onto the previous piece 11. Alternatively, the pieces 11 with mounting holes 111 and magnetic conductive surfaces 113 can be pre-stamped using a stamping device. Then, the pieces 11 are pressed one by one onto the rotating shaft 2 using a riveting device. The riveting device can be equipped with protrusions that form the riveting holes 112, which are formed simultaneously when the next piece 11 is pressed onto the previous piece 11. The rivet joints 112 between the laminations 11 provide axial and circumferential fixation, making the laminations 11 fit together more tightly and securely. The staggered arrangement between adjacent laminations 11 can make the magnetic field distribution more uniform. The mounting holes 111 of the laminations 11 and the rotating shaft 2 are fitted with a tongue and groove joint, which fixes the laminations 11 relative to each other in the axial direction of the rotating shaft 2, further improving the circumferential fixation between the laminations 11 and between the laminations 11 and the rotating shaft 2. After the laminations 11 are stacked, the bushings 3 are inserted into both ends of the rotating shaft 2, so that the bushings 3 are pressed into contact with the two end faces of the stacked laminations 1. Then, the bushings 3 are welded to the rotating shaft 2 to fix the stacked laminations 1 in the axial direction. No glue is needed, which helps to improve the working stability of the overall rotor.

[0034] Among them, the rivet 112 and the magnetic conductive surface 113 on the lamination 11 can be symmetrically arranged with respect to the mounting hole 111. The number of rivet 112 and magnetic conductive surface 113 can both be two. The mounting hole 111 and the rotating shaft 2 can be a clearance fit or an interference fit. Adjacent laminations 11 can be misaligned by 180°.

[0035] Thus, the rivet 112 between the punches 11 makes the adjacent punches 11 fit together and position them. The circumferential positioning between the punches 11 and the rotating shaft 2 is achieved by the concave-convex fit between the rotating shaft 2 and the mounting holes 111 of the punches 11. Then, the two ends of the stacked punches 11 are abutted and restricted by the bushing 3 and welded to the rotating shaft 2, thereby ensuring the stability of the circumferential and axial connection between the punches 11 and between the punches 11 and the rotating shaft 2. Its structure is stable, the assembly is simple, and it can ensure the stability of the electromagnetic characteristics of the sensor.

[0036] Optionally, the rotating shaft 2 has a protrusion arranged along its axial direction, and the mounting hole 111 has a recess 114 adapted to the protrusion. Understandably, the cooperation of the protrusion and the recess 114 forms a stable tongue-and-groove structure between the lamination 11 and the rotating shaft 2, thereby fixing the lamination 11 and the rotating shaft 2 relatively in the circumferential direction, which helps to improve the stability of the electromagnetic characteristics. The cross-sections of the protrusion and the recess 114 can be semi-circular, and there can be two protrusions, which can be symmetrically arranged with respect to the axis of the rotating shaft 2.

[0037] Optionally, the central angle of the magnetically conductive surface 113 is 90°. Understandably, by setting the central angle of the magnetically conductive surface 113 to 90°, it has a larger linear range, allowing measurement of angles within 90°, thus easily meeting existing measurement requirements. The magnetically conductive surface 113 can be formed by an inward concavity at the outer edge of the lamination 11, with the included angle at both ends of the concavity being 90°. There are two magnetically conductive surfaces 113, symmetrically arranged to correspond to the mounting holes 111. The two magnetically conductive surfaces 113 and the rivet opening 112 can be staggered.

[0038] Optionally, the rivet 112 is arched. Understandably, the arched shape of the rivet 112 facilitates more precise positioning of the stampings 11 when they are stacked, and also prevents damage to the stampings 11 during the forming process of the rivet 112. There can be two rivets 112, symmetrically arranged with respect to the mounting holes 111. The two rivets 112 and the two protrusions are on the same straight line, and the two magnetic surfaces 113 are located on either side of the two rivets 112 and the two protrusions. This reasonable allocation of positions ensures the strength of the stampings 11, while also ensuring more even stress distribution among the stampings 11, resulting in a more secure connection.

[0039] Optionally, each lamination 11 has a marking groove 115 on its outer edge for reference to misaligned stacking. Understandably, since the laminations 11 have a symmetrical structure, it is easy to confuse whether the laminations 11 are misaligned. The marking groove 115 facilitates misalignment identification during lamination assembly, thereby ensuring a uniform magnetic field distribution of the entire rotor. The marking groove 115 can be located on the arc segment of the magnetically conductive surface 113. Each lamination 11 has one marking groove 115. During assembly, the subsequent lamination 11 is rotated 180° relative to the previous lamination 11. The marking groove 115 can be formed during stamping.

[0040] Optionally, the laminations 11 are arranged in an umbrella shape. Understandably, the umbrella shape helps the laminations 11 to have a certain elastic deformation capability. After the laminations 11 are stacked into a stack 1, the stack 1 can be pressed by the bushing 3 from both ends of the stack 1 through the equipment, so that the stack 1 undergoes a certain amount of elastic deformation. Then, the bushing 3 is welded to the rotating shaft 2. In this way, the laminations 11 always maintain elastic contact force, which facilitates the positioning and fitting of the laminations 11, thereby improving the stability of the rotor operation.

[0041] Optionally, the mounting hole 111 and the rotating shaft 2 are interference fit. Understandably, the interference fit between the mounting hole 111 and the rotating shaft 2 facilitates the clamping of the lamination 11 onto the rotating shaft 2 when the lamination 11 is fitted into it. At the same time, it can greatly eliminate the fit clearance between the mounting hole 111 of the lamination 11 and the rotating shaft 2, thereby improving the fit accuracy between the laminations 11 and thus improving the stability of the rotor operation.

[0042] Optionally, the protrusion height of the rivet 112 is greater than the thickness of the sheet 11. Understandably, by setting the protrusion height of the rivet 112 to be greater than the thickness of the sheet 11, when the sheets 11 are stacked, the rivet 112 of the later sheet 11 can cooperate with the rivet 112 of the previous two sheets 11, making the positioning between the sheets 11 stronger and the compressive force between the rivet 112 greater, which is beneficial to the positioning and bonding between the sheets 11.

[0043] Optionally, the rotating shaft 2 includes a middle section 21, on which the laminated plates 1 are mounted. Annular clearance grooves 24 are provided at both ends of the middle section 21. Understandably, the annular clearance grooves 24 at the two ends facilitate the installation of the bushing 3, allowing it to abut against the two ends of the middle section 21, thus ensuring the uniformity of the abutment of the laminated plates 1 by the bushing 3, and consequently ensuring the stability of the rotor operation. The protrusions are the same length as the middle section 21, and the distance between the two protrusions of the rotating shaft 2 is greater than the diameter of the front section 22 and the rear section 23, or the outer diameter of the middle section 21 of the rotating shaft 2 is greater than that of the front section 22 and the rear section. When the bushing 3 is fitted onto the rotating shaft 2, it abuts against the two ends of the middle section 21, ensuring the uniformity of the bushing 3's installation position.

[0044] For the processing of stamping 11

[0045] The stamped piece 11 is formed by die stamping, and after forming, two protruding rivet holes 112 are formed, which can precisely control the size and shape, and ensure the assembly accuracy and performance consistency of the stacked pieces 1.

[0046] Heat treatment process of blank 11: The cleaned blank 11 is loaded into a vacuum sintering furnace at a temperature not exceeding 150℃. Hydrogen is introduced into the sealed chamber for 2-3 hours to exhaust the air. The pressure rise rate of the vacuum furnace is <0.8Pa / h. The temperature is then raised to 1150-1200℃ and held for 5-6 hours. The blank is then cooled to 600℃ at a rate not exceeding 200℃ / h, and then cooled to below 200℃ at a rate not less than 400℃ / h before being removed from the furnace.

[0047] For the assembly of stamping 11

[0048] After heat treatment, the two rivet holes 112 and the center hole of each stamp 11 are aligned. Each stacked piece 1 is offset 180° clockwise from the front piece. Multiple stamps 11 are stacked in sequence, and then the stacked stamps 11 are riveted into a whole by riveting fixtures to form a structurally stable stacked piece 1.

[0049] For the assembly of laminate 1 and shaft 2

[0050] First, insert the stacked piece 1 from the left or right side of the rotating shaft 2. Align the two recessed parts 114 of the center hole of the stacked piece 1 with the two protruding parts of the middle section 21 of the rotating shaft 2. Use a tooling to rivet the stacked piece 1 into the middle section 21 of the rotating shaft 2 until the end face of the stacked piece 1 is aligned with the end face of the middle section 21 of the rotating shaft 2, ensuring that the stacked piece 1 does not rotate or shift relative to the rotating shaft 2.

[0051] Next, insert the two bushings 3 from the left and right sides of the rotating shaft 2 respectively. After assembly, connect and fix the bushings 3 to the rotating shaft 2 at the contact point between the rotating shaft 2 and the bushings 3 by laser welding to ensure that the axial rotation or displacement does not occur.

[0052] The improved rotary transformer's rotor operates stably and reliably over a wide temperature range, from 200℃ to -55℃. There are no cracks or loosening between the laminations 11. The rotor core and shaft 2 will not experience relative circumferential loosening. The laminations 11 are riveted together using a mold, ensuring dimensional accuracy and good process consistency. It has high mechanical strength and a stable structure, and will not experience delamination or displacement under high speed, vibration, or impact loads. The rotor assembly process is simple and the production cycle is short.

[0053] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0055] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0058] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A rotary transformer rotor, characterized in that, include: The stacked pieces are formed by staggered stacking of multiple stamped pieces. Each stamped piece is provided with mounting holes and rivet openings on the stacked surface of each stamped piece. Adjacent stamped pieces are positioned and fitted together by the concave and convex fit of the rivet openings. Each stamped piece has a magnetic conductive surface on its outer edge. A rotating shaft passes through the mounting hole to keep each of the punches coaxial. The rotating shaft and the mounting hole have a concave-convex fit to restrict the relative rotation between the rotating shaft and each of the punches in the circumferential direction. Two bushings are fitted onto the rotating shafts at both ends of the stacked pieces and welded to the rotating shafts to restrict relative movement between the stacked pieces and the rotating shafts in the axial direction.

2. The rotary transformer rotor as described in claim 1, characterized in that, The rotating shaft has a protrusion arranged along its axial direction, and the mounting hole has a recess that matches the protrusion.

3. The rotary transformer rotor as described in claim 1, characterized in that, The central angle of the magnetically conductive surface is 90°.

4. The rotary transformer rotor as described in claim 1, characterized in that, The rivet opening is arched.

5. The rotary transformer rotor as described in claim 1, characterized in that, Each of the aforementioned laminations has a marking groove on its outer edge for reference to the misaligned stacking.

6. The rotary transformer rotor as described in claim 1, characterized in that, The stamped sheet is arranged in an umbrella shape.

7. The rotary transformer rotor as described in claim 1, characterized in that, The mounting hole and the rotating shaft are interference fit.

8. The rotary transformer rotor as described in claim 1, characterized in that, The protrusion height of the rivet is greater than the thickness of the lamination.

9. The rotary transformer rotor as described in claim 1, characterized in that, The rotating shaft includes a middle section, the stacked plates are mounted on the middle section, and annular clearance grooves are provided at both ends of the middle section.

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