Reluctance rotary transformer stator tooth backlash slot wedge device capable of improving precision

Abstract

The utility model discloses a reluctance rotary transformer stator tooth backlash slot wedge device capable of improving precision, comprising stator teeth between which a tooth backlash exists; the pole shoes are arranged at the ends of the stator teeth, every two adjacent pole shoes are distributed at intervals to form discontinuous first arc surfaces, mounting grooves are symmetrically formed in the two ends of each pole shoe, and the mounting grooves, in the two sides of the tooth side gap, of every two adjacent pole shoes are symmetrically arranged relative to the tooth side gap; and the slot wedge shields the tooth side gap between the two adjacent stator teeth, so that the two adjacent pole shoes are changed from discontinuous first arc surfaces to continuous first arc surfaces. The mounting grooves and the groove wedges are arranged at the two ends of the pole shoes, and the groove wedges are mounted in the mounting grooves, so that inner holes of the reluctance rotary transformer stator are combined into a whole circle, electromagnetic air gaps between the inner holes of the reluctance rotary transformer stator and an outer circle of a rotor are kept continuous, higher harmonics of sine / cosine output voltage caused by discontinuous tooth backlash of the reluctance rotary transformer stator are reduced, and the reliability of the reluctance rotary transformer is improved. And the precision of the output signal of the reluctance rotary transformer is improved.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic sensor technology, and in particular to a magnetoresistive rotary stator tooth side clearance slot wedge device that can improve accuracy. Background Technology

[0002] A magnetoresistive rotary transformer (MRTE) is a type of reluctance rotary transformer that detects changes in physical quantities, such as current, rotational speed, or linear displacement, by measuring changes in the magnetic field. It has a simple and reliable structure and is suitable for precise measurement of angles and angular velocities in extreme and harsh environments. It is commonly used as a position and speed sensor for motors. The application of MRTEs has expanded from its initial military applications to civilian electromechanical systems, such as machine tools and new energy vehicles.

[0003] The stator of the reluctance rotary transformer has a toothed structure, typically with an even number of teeth, such as 8, 10, 12, or 14. The inner hole of the stator is circular, and the outer arc of the rotor follows a sinusoidal pattern. Therefore, the electromagnetic air gap between the stator and rotor of the reluctance rotary transformer changes in a sinusoidal pattern.

[0004] However, ① the presence of the stator tooth flank gap in the reluctance resolver causes discontinuity in the stator and rotor air gaps, resulting in a larger air gap size at the tooth flank gap position and a deterioration in the sinusoidal reluctance of the air gap. ② the presence of the stator tooth flank gap also causes high-order harmonics in the air gap reluctance sinusoidal waveform of the reluctance resolver, directly leading to a deterioration in the sinusoidal nature of the reluctance resolver output signal, increased electrical error, and lower accuracy. Utility Model Content

[0005] Based on this, it is necessary to propose a wedge device for the stator tooth side gap of a reluctance resolver to improve accuracy, thereby solving the problem of discontinuity in the air gap between the stator and rotor caused by the presence of stator tooth side gap, reducing the electrical error of the reluctance resolver and improving its accuracy.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A reluctance rotatable stator tooth side clearance slot wedge device with improved accuracy, characterized in that it comprises:

[0008] Stator teeth, with tooth flank clearance between adjacent stator teeth;

[0009] The pole shoe is disposed at the end of the stator tooth. Two adjacent pole shoes are spaced apart and present a discontinuous first arc surface. The pole shoe has mounting grooves symmetrically disposed at both ends. The mounting grooves of two adjacent pole shoes are symmetrically disposed about the tooth side gap.

[0010] A slot wedge, which is magnetically conductive, is disposed in the mounting slots of two adjacent pole shoes to block the tooth flank gap between the two adjacent stator teeth, so that the two adjacent pole shoes are connected from discontinuous first arc surfaces to continuous first arc surfaces.

[0011] In one embodiment, the length of the slot wedge is equal to or greater than the thickness of the stator tooth.

[0012] In one embodiment, the slot wedge has an approximate cuboid structure, with a second arc surface on the side closest to the air gap, and the curvature of the second arc surface is the same as that of the first arc surface.

[0013] In one embodiment, the slot wedge is a non-metallic plate containing magnetically conductive powder.

[0014] In one embodiment, the width of the slot wedge is less than or equal to the sum of the distance between the tooth flank clearance and the depth of the two mounting slots, and greater than the tooth flank clearance.

[0015] In one embodiment, the magnetic permeability of the slot wedge is less than that of the pole shoe.

[0016] In one embodiment, the slot wedge and the mounting slot tooth side are in clearance fit.

[0017] In one embodiment, the slot wedge is detachably installed in the mounting slot. After the reluctance rotary stator is embedded in the enameled wire, the slot wedge is inserted into the mounting slot and fixed, and it is in clearance fit with the tooth side of the mounting slot.

[0018] In one embodiment, each tooth side clearance of the stator tooth is provided with the slot wedge.

[0019] In one embodiment, the slot wedge is provided in the tooth flank clearance of a portion of the stator teeth.

[0020] By setting mounting slots and slot wedges at both ends of the pole shoes, and installing the slot wedges in the mounting slots, the inner holes of the reluctance resolver stator are combined into a complete circle. This makes the electromagnetic air gap between the inner hole of the reluctance resolver stator and the outer circle of the rotor continuous, reducing the high-order harmonics of the sine / cosine output voltage caused by the discontinuity of the reluctance resolver stator tooth side gap, and improving the accuracy of the reluctance resolver output signal. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] in:

[0023] Figure 1 This is a three-dimensional structural diagram of a reluctance rotary stator tooth side clearance slot wedge device that can improve accuracy, as described in this utility model.

[0024] Figure 2 yes Figure 1 Enlarged view of point A.

[0025] The markings in the attached diagram are described below:

[0026] 1. Stator teeth; 2. Pole shoes; 21. First pole shoe; 211. First mounting slot; 212. Second mounting slot; 22. Second pole shoe; 221. Third mounting slot; 222. Fourth mounting slot; 3. Slot wedge. Detailed Implementation

[0027] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly on the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "left," "right," "upper end," "lower end," "top," and "bottom," etc., used in this specification indicate the orientation or positional relationship 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 do not 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0029] To address the problem in existing reluctance rotary transformer stator tooth side gap structures that cause discontinuities in the stator-rotor air gap and generate high-order harmonics, leading to a deterioration in the sinusoidal reluctance of the air gap, a reluctance rotary transformer stator tooth 1 side gap slot wedge 3 structure is proposed to improve accuracy. The following will be combined with the attached... Figures 1 to 2 The present invention provides a detailed description of an anti-accidental touch charger according to an embodiment of the present invention.

[0030] Please see Figure 1 and Figure 2 , Figure 1 This is a three-dimensional structural diagram of a reluctance rotary transformer stator tooth side clearance slot wedge device that can improve accuracy, as described in this utility model. Figure 2 yes Figure 1Enlarged view of point A.

[0031] A slot wedge structure 3 for a reluctance rotatable stator slot that improves accuracy includes:

[0032] Stator tooth 1, there is a tooth flank clearance between adjacent stator teeth 1;

[0033] The pole shoe 2 is disposed at the end of the stator tooth 1. Two adjacent pole shoes 2 are distributed at intervals to form a discontinuous first arc surface. The pole shoe 2 is symmetrically provided with mounting grooves 3 at both ends. The mounting grooves 3 on both sides of the tooth side gap of two adjacent pole shoes are symmetrically arranged with respect to the tooth side gap.

[0034] The slot wedge 3, which has magnetic conductivity, is set in the mounting slot 3 of two adjacent pole shoes 2 to block the tooth side gap between the two adjacent stator teeth 1, so that the two adjacent pole shoes 2 are connected from the discontinuous first arc surface to the continuous first arc surface.

[0035] Specifically, the change in air gap magnetic reluctance between the stator and rotor follows the "principle of minimum magnetic reluctance". The salient pole coils are connected in series and form a pair of electromagnets when energized.

[0036] The reluctance resolver stator has a slotted structure. The number of stator teeth 1 is generally 8, 10, 12, 14, etc. There is an empty tooth flank gap between two adjacent stator teeth 1. Multiple adjacent stator teeth 1 form a first arc surface. All stator teeth 1 form a discontinuous circle. At the end of the stator teeth 1, there is a pole shoe 2. The pole shoe 2 is a structure made of ferromagnetic material. It is a key part to obtain a better linear distribution of the magnetic field. It is used for positioning the permanent magnet, improving the magnetic field distribution, reducing the air gap reluctance, optimizing the main magnetic pole magnetic field distribution, and facilitating the fixation of the excitation group. By optimizing the magnetic field distribution, the performance and efficiency of the motor are improved. The electromagnetic air gap of the reluctance resolver stator and rotor changes according to a sine wave pattern.

[0037] Due to the presence of tooth flank clearance, the pole shoes 2 are also discontinuous, with adjacent pole shoes 2 separated by tooth flank clearance, resulting in a discontinuous stator-rotor air gap and a deterioration in the sinusoidal reluctance of the air gap. Therefore, a mounting groove is provided at each end of the pole shoe 2, and the two mounting grooves are symmetrical about the pole shoe 2. Simultaneously, the tooth flank clearances of the mounting grooves of two adjacent pole shoes 2 are symmetrical. For example, the two pole shoes 2 are denoted as the first pole shoe 21 and the second pole shoe 22, and the tooth flank clearance between the first pole shoe 21 and the second pole shoe 22 is denoted as the first tooth flank clearance L. The first pole shoe 21 is provided with a first mounting groove 211 and a second mounting groove 212, and the second pole shoe 22... The pole shoe 22 is provided with a third mounting slot 221 and a fourth mounting slot 222. The first mounting slot 211 and the second mounting slot 212 are symmetrical, as are the third mounting slot 221 and the fourth mounting slot 222. The second mounting slot 212 and the third mounting slot 221 are symmetrical about the first tooth flank clearance L. A slot wedge 3 is inserted into the second mounting slot 212 and the third mounting slot 221 to block the first tooth flank clearance L, so that two adjacent pole shoes 2 are connected from discontinuous first arc surfaces to continuous first arc surfaces. If all tooth flank clearances are blocked by the slot wedge 3, the pole shoes 2 are connected into a continuous circular surface. By setting mounting slots and slot wedges 3 in the tooth flank clearances, the inner hole of the reluctance resolver stator is combined into a complete circle, making the electromagnetic air gap between the inner hole of the reluctance resolver stator and the outer circle of the rotor continuous. This reduces the high-order harmonics of the sine / cosine output voltage caused by the discontinuity of the reluctance resolver stator slot openings and improves the accuracy of the reluctance resolver output signal.

[0038] In one embodiment, the length of the slot wedge 3 is equal to or greater than the thickness of the stator tooth 1.

[0039] Specifically, a coil is wound on stator tooth 1, and the coil has a large number of turns. The coil covers the side of stator tooth 1, which is equivalent to increasing the thickness of stator tooth 1. The coil that protrudes will generate magnetic field interference, which is not conducive to the accuracy of the reluctance resolver output signal. Therefore, the length of slot wedge 3 cannot be less than the thickness of stator tooth 1, but needs to be equal to or greater than the thickness of stator tooth 1. Generally, it is chosen to be 2mm-5mm longer. The part of slot wedge 3 that protrudes from stator tooth 1 can block the coil covering the surface of stator tooth 1 from facing the rotor, reduce unnecessary electromagnetic interference, and improve the accuracy of the reluctance resolver output signal.

[0040] In one embodiment, the slot wedge 3 has an approximate cuboid structure, with a second arc surface on the side near the air gap, and the curvature of the second arc surface is the same as that of the first arc surface.

[0041] Specifically, the stator of the reluctance rotary transformer has a toothed structure. The number of stator teeth 1 is generally 8, 10, 12, 14, etc. There is an empty tooth side gap between two adjacent stator teeth 1. Multiple adjacent stator teeth 1 form a first arc surface. All stator teeth 1 form a discontinuous circle. Pole shoes 2 are provided on the stator teeth 1. Multiple pole shoes 2 also form a first arc surface. However, this first arc surface is not a continuous arc surface. Slot wedges 3 are inserted into the mounting slots on both sides of the tooth side gap. The slot wedges 3 are three-dimensional structures, approximately cuboids. The surface of the slot wedges 3 facing the electromagnetic air gap is an arc-shaped surface, referred to as the second arc surface. The curvature of the second arc surface is the same as that of the first arc surface. When the slot wedges 3 block the tooth side gap, they form a continuous arc surface with the pole shoes 2. In fact, it is a polygon close to a circle. By setting the second arc surface, the pole shoes 2 and the slot wedges 3 can form an arc shape that is closer to a circle. By setting mounting slots and slot wedges 3 with second arc surfaces in the tooth side gap, the inner hole of the reluctance resolver stator is combined into a smoother circle, so that the electromagnetic air gap between the inner hole of the reluctance resolver stator and the outer circle of the rotor remains continuous. This further reduces the high-order harmonics of the sine / cosine output voltage caused by the discontinuity of the reluctance resolver stator slots, improves the accuracy of the reluctance resolver output signal, and makes the accuracy of the reluctance resolver output signal closer to the accuracy of the reluctance resolver output signal output by a smooth circular rotor.

[0042] In one embodiment, the slot wedge 3 is a non-metallic plate containing magnetically conductive powder.

[0043] Specifically, the slot wedge 3 can be made of glass fiber composite board, phenolic composite board, polyurethane composite board, rigid polyvinyl chloride board, etc. Magnetic powder is added during the manufacturing process. Magnetic powder, as a material with good magnetic conductivity, is usually made by mixing and pressing ferromagnetic powder with an insulating medium. Magnetic powder can include Fe, Fe-Ni-Mo and Fe-Si-Al metal powders and amorphous and nanocrystalline alloy powders, etc. Glass fiber is preferred for non-metallic boards because it has a lower cost.

[0044] The slot wedge 3 is made of non-metallic material with magnetic powder instead of magnetized metal or magnet for two reasons. During the casting process, the die-casting temperature of non-metallic materials is 300-500℃, while the casting temperature of metal materials is above 1200℃. Magnetic materials cannot withstand the high temperature of 1200℃. In terms of magnetic conductivity, it needs to be magnetic but cannot be too strong. If the magnetic conductivity is too strong, it will cause the sensor to fail. Metal materials have too strong magnetic conductivity. Non-metallic slot wedges 3 have different magnetic conductivity specifications that can be selected for replacement. Therefore, non-metallic plates containing magnetic powder are selected for slot wedge 3.

[0045] Lightweight, low-cost, and with controllable magnetic strength, it is more conducive to reducing high-order harmonics in the sine / cosine output voltage caused by discontinuity in the stator slots of the reluctance resolver and improving the accuracy of the output signal of the reluctance resolver.

[0046] In one embodiment, the width of the slot wedge 3 is less than or equal to the sum of the distance between the tooth flank clearance and the depth of the two mounting slots 3, and greater than the tooth flank clearance.

[0047] Specifically, there is a lateral clearance between two adjacent stator teeth 1. The slot wedge 3 is used to block the tooth lateral clearance. Therefore, the width of the slot wedge 3 should be greater than the width of the tooth lateral clearance. The part of the slot wedge 3 that extends beyond the lateral clearance is inserted into the mounting grooves on both sides of the clearance. Since the slot wedge 3 is made of non-metallic material, it cannot withstand large pressure. Therefore, the width of the slot wedge 3 is less than or equal to the sum of the tooth lateral clearance and the depth of the two mounting grooves 3.

[0048] It can shield the tooth side gap, making the inner hole of the reluctance resolver stator form a complete circle. This ensures that the electromagnetic air gap between the inner hole of the reluctance resolver stator and the outer circle of the rotor is continuous, reducing the high-order harmonics of the sine / cosine output voltage caused by the continuity of the reluctance resolver stator slot opening, and improving the accuracy of the reluctance resolver output signal.

[0049] In one embodiment, the magnetic permeability of the slot wedge 3 is less than that of the pole shoe 2.

[0050] Specifically, magnetic permeability is used to measure the magnetic conductivity of a material. Since the magnetic permeability of other materials is greater than that in vacuum and air, the magnetic field generated by the excitation winding is weaker at the tooth gap. Magnetic powder needs to be added to the slot wedge 3 to generate a magnetic field at the tooth gap and increase the permeability relative to air, ensuring that the magnetic field lines are distributed in line with the magnetic field lines at both ends of the pole shoe 2. The amount of magnetic powder ensures that the magnetic induction intensity of the slot wedge 3 is close to that at both ends of the pole shoe 2, gradually decreasing in strength. This maintains the sinusoidal nature of the air gap reluctance, reduces higher harmonics of the air gap reluctance, improves the sinusoidal nature of the reluctance resolver output signal, and enhances electrical accuracy.

[0051] In one embodiment, the groove wedge 3 and the mounting groove 3 are tooth-side clearance fit.

[0052] Specifically, the slot wedge 3 is made of a non-metallic material with relatively weak strength, and cannot be used with an interference fit or a transition fit, otherwise the slot wedge 3 will be damaged. The length of the slot wedge 3 corresponds to the thickness of the stator tooth 1, and is used to shield the stator tooth 1 and its winding. The width of the slot wedge 3 corresponds to the sum of the tooth flank clearance of the adjacent stator tooth 1 and the depth of the two mounting slots. The thickness of the slot wedge 3 corresponds to the width of the mounting slot.

[0053] The thickness of the slot wedge 3 is less than or equal to the width of the mounting groove, and the width of the slot wedge 3 is less than the sum of the tooth flank clearance and the depth of the two mounting grooves. This ensures that the slot wedge 3 is loose in the mounting groove, providing a clearance fit, so that the slot wedge 3 will not be damaged by compression. During installation, the magnetic wedge is applied with glue and then inserted into the mounting groove, where it is glued in place.

[0054] The reluctance rotary transformer stator comes in various specifications, and the corresponding mounting slots and slot wedges 3 also come in various specifications. The thickness of the slot wedges 3 varies from 0.05mm to 3.0mm depending on the specification. Since the slot wedges 3 are made of non-metallic materials, they cannot withstand large pressure. Therefore, the thickness of the slot wedges 3 is not greater than the width of the mounting slot. The thickness of the slot wedges 3 is selected from 0.05mm to 3.0mm.

[0055] In one embodiment, the slot wedge 3 is detachably installed in the mounting slot. After the reluctance rotary transformer stator is embedded in the enameled wire, the slot wedge 3 is inserted into the mounting slot and fixed, and it is in clearance fit with the tooth side of the mounting slot.

[0056] The function of slot wedge 3 includes not only ensuring the continuity of the electromagnetic air gap outside the reluctance rotary stator, but also fixing the stator winding within the tooth side gap. After applying glue to slot wedge 3, it is inserted into the mounting slot. Once the glue has solidified, slot wedge 3 is fixedly installed in the mounting slot 3 and blocks the tooth side gap. At this time, slot wedge 3 and pole shoe 2 form a continuous arc surface, ensuring the continuity of the stator and rotor air gaps. The air gap size is normal at the tooth side gap position, and the air gap reluctance remains unchanged, thus avoiding the generation of high-order harmonics.

[0057] In one embodiment, each tooth side gap of the stator tooth 1 is provided with the slot wedge 3.

[0058] Specifically, the stator of the reluctance resolver has multiple stator teeth 1, and there is a tooth flank gap between two adjacent stator teeth 1. The reluctance air gap at the tooth flank gap position is discontinuous, the air gap size at the tooth flank gap position becomes larger, and the air gap reluctance sinusoidal property deteriorates. If it is necessary to improve the accuracy of the output signal of the reluctance resolver and the accuracy requirement is high, it is possible to install a slot wedge 3 into each tooth flank gap of the stator tooth 1, so that the slot wedge 3 and the pole shoe 2 are connected to form a continuous arc surface, i.e., a complete circle, so that the air gap size at the tooth flank gap position remains unchanged and the air gap reluctance sinusoidal property remains unchanged.

[0059] In one embodiment, the slot wedge 3 is provided in part of the tooth side clearance of the stator tooth 1.

[0060] Specifically, the stator of a reluctance resolver has multiple stator teeth 1, with tooth flank gaps between adjacent stator teeth 1. The air gap at these tooth flank gap locations is discontinuous, resulting in a larger air gap size and a deterioration in the sinusoidal reluctance of the air gap. If it is necessary to improve the accuracy of the reluctance resolver's output signal, but not by a significant margin, slot wedges 3 can be inserted into some of the tooth flank gaps. This makes the stator-rotor air gap continuous at some tooth flank gap locations, increasing the air gap size at these gap locations, reducing the discontinuity of the stator-rotor air gap, and improving the reluctance resolver's output signal accuracy. Compared to inserting slot wedges 3 into all tooth flank gaps, selecting only a portion of the tooth flank gaps for slot wedge insertion reduces the workload while still meeting electrical accuracy requirements.

[0061] The working principle of this device is as follows:

[0062] The working principle of a reluctance rotary transformer is based on the reluctance principle. It consists of a stator and a rotor. The stator comprises a stator core, a stator winding for signal generation, and an excitation winding. The rotor is formed by stacking rotor laminations with salient poles. When a certain sinusoidal AC voltage is applied to the excitation winding in the stator slot, the rotor's rotation causes a change in the air gap permeability. As the rotor rotates relative to the stator, the air gap permeability changes. For every rotor tooth pitch rotated, the air gap permeability changes for one cycle; for one revolution, it changes for several cycles. This change in air gap permeability leads to a change in the mutual inductance between the input and output windings, which in turn changes the induced electromotive force in the output winding. Ultimately, this induces sine and cosine signals in the signal winding. These signals are transmitted to the motor controller, and the decoding circuit determines the rotor's position.

[0063] A reluctance resolver with air gap magnetoresistive is a type of rotary transformer that uses changes in air gap magnetoresistive to output signal changes. Based on the principle of electromagnetic induction, this type of rotary transformer uses changes in the air gap and magnetoresistive to cause the induced voltage of the output winding to change sinusoidally or cosinely with the mechanical rotation angle, thereby achieving angle sensing. Compared with traditional wire-wound resolvers, the signal winding and excitation winding of a reluctance resolver are both fixed on the stator of the resolver. It only generates changes in air gap magnetic permeability with a sinusoidal trajectory through the rotor salient pole effect, inducing sine and cosine signals in the signal winding.

[0064] By setting mounting slots and slot wedges at both ends of the pole shoe, and installing the slot wedges in the mounting slots of the pole shoe 2, the inner hole of the reluctance resolver stator is combined into a complete circle. This makes the electromagnetic air gap between the inner hole of the reluctance resolver stator and the outer circle of the rotor continuous, reducing the high-order harmonics of the sine / cosine output voltage caused by the discontinuity of the tooth side gap of the reluctance resolver stator. This improves the accuracy of the reluctance resolver output signal by about 30%, and reduces the electrical error from 20 points to about 14 points.

[0065] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different solutions of this utility model as described above. For the sake of brevity, they are not provided in the details. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A wedge device for improving the precision of a reluctance rotary stator tooth side clearance groove, characterized in that, include: Stator teeth, with tooth flank clearance between adjacent stator teeth; The pole shoe is disposed at the end of the stator tooth. Two adjacent pole shoes are spaced apart and present a discontinuous first arc surface. The pole shoe has mounting grooves symmetrically disposed at both ends. The mounting grooves of two adjacent pole shoes are symmetrically disposed about the tooth side gap. A slot wedge, which is magnetically conductive, is disposed in the mounting slots of two adjacent pole shoes to block the tooth flank gap between the two adjacent stator teeth, so that the two adjacent pole shoes are connected from discontinuous first arc surfaces to continuous first arc surfaces.

2. The reluctance rotary transformer stator tooth side clearance slot wedge device with improved accuracy according to claim 1, characterized in that, The length of the slot wedge is equal to or greater than the thickness of the stator tooth.

3. The reluctance rotary transformer stator tooth side clearance slot wedge device with improved accuracy according to claim 2, characterized in that, The groove wedge has an approximate cuboid structure, with a second arc surface on the side closest to the air gap. The curvature of the second arc surface is the same as that of the first arc surface.

4. The reluctance rotary transformer stator tooth side clearance slot wedge device with improved accuracy according to claim 1, characterized in that, The width of the slot wedge is less than or equal to the sum of the tooth flank clearance and the depth of the two mounting slots, and greater than the tooth flank clearance.

5. A reluctance rotary stator tooth side clearance slot wedge device with improved accuracy according to claim 1, characterized in that, The magnetic permeability of the slot wedge is less than that of the pole shoe.

6. The reluctance rotary transformer stator tooth side clearance slot wedge device with improved accuracy according to claim 1, characterized in that, The groove wedge and the mounting groove tooth side clearance fit.

7. A reluctance rotary transformer stator tooth side clearance slot wedge device with improved accuracy according to claim 1, characterized in that, The slot wedge is detachably installed in the mounting slot. After the reluctance rotary transformer stator is embedded in the enameled wire, the slot wedge is inserted into the mounting slot and fixed, and it is in clearance fit with the tooth side of the mounting slot.

8. A reluctance rotary transformer stator tooth side clearance slot wedge device with improved accuracy according to claim 1, characterized in that, Each tooth side gap of the stator tooth is provided with the slot wedge.

9. A reluctance rotary transformer stator tooth side clearance slot wedge device with improved accuracy according to claim 1, characterized in that, The stator teeth have a slotted wedge in part of their tooth side clearance.

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