Resolver stator structure and resolver

Abstract

To provide a resolver stator structure capable of suppressing reduction in the angle detection accuracy of a resolver and a resolver.SOLUTION: The stator structure includes a stator core and a stator winding. The stator core has an annular-shaped body and a plurality of teeth extending inwardly in the radial direction from a peripheral part of the body and arranged at an equal pitch along the circumferential direction. The stator winding is wound around the teeth. The body is provided with a plurality of long through-holes arranged at equal intervals along the circumferential direction. The neighboring long through-holes form gaps connected from each of outer circumferential edges and extending in close proximity to each other. In the radial direction, a pair of arc-shaped gaps is formed between the teeth and the gaps connected to the long through-holes. Bridging portions are formed between the long through-holes and the arc-shaped gaps, and the pair of arc-shaped gaps, respectively.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a stator structure of a resolver and a resolver. [Background technology]

[0002] 2. Description of the Related Art Resolvers have been known as sensors for detecting the rotation angle of rotating electrical machines such as motors and generators.

[0003] Such a resolver includes, for example, a stator core having a plurality of teeth extending from the inner periphery of a ring-shaped main body toward the center, and a rotor disposed inside the stator core, the rotor being attached to the shaft of a rotating electric machine. Stator windings are wound around the teeth via insulators, and the stator windings are composed of an excitation winding to which an excitation voltage is supplied and an output winding that outputs a two-phase signal according to the rotation angle of the rotor.

[0004] When a current flows through the windings of a rotating electric machine, which is the object of rotation angle detection by a resolver, leakage magnetic flux from the windings of the rotating electric machine and magnetic flux from the permanent magnets of the rotor of the rotating electric machine may enter the inner area of ​​the stator structure of the resolver, with the mounting parts of the stator structure of the resolver and bolts inserted into the mounting parts acting as antennas, and may become interlinked with the stator windings of the resolver.When the magnetic flux from the rotating electric machine interlinks with the stator windings of the resolver, it is superimposed as a noise component on the waveform of the signal output from the output winding of the stator winding, which may reduce the angle detection accuracy of the resolver.

[0005] To address this issue, a resolver stator structure has been proposed that can reduce the variation in the effect that magnetic flux penetrating from the outer periphery to the inner periphery of the stator structure has on the windings wound around the teeth, thereby suppressing the decrease in angle detection accuracy caused by external magnetic flux (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2019-126241 Summary of the Invention [Problem to be solved by the invention]

[0007] However, conventional stator structures are designed to reduce the variation in the effect that external magnetic flux penetrating from the outer periphery to the inner periphery of the stator core has on the stator windings wound around the teeth. Therefore, in areas where some of the external magnetic flux penetrates the inner periphery of the stator core and disturbances occur in the flow of excitation magnetic flux generated by the stator windings wound around the teeth, the part of the external magnetic flux that has penetrated inside the stator core is likely to be superimposed on the disturbed excitation magnetic flux, leaving room for improvement in preventing a decrease in the angle detection accuracy of the resolver.

[0008] The present invention has been made in view of the above, and an object of the present invention is to provide a stator structure of a resolver that can suppress a decrease in the angle detection accuracy of the resolver, and a resolver. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems and achieve the object, a stator structure according to one aspect of the present invention includes a stator core and a stator winding. The stator core has an annular main body and a plurality of teeth extending radially inward from the periphery of the main body and arranged at equal intervals along the circumferential direction. The stator winding is wound around the teeth. The main body has a plurality of elongated through holes arranged at equal intervals along the circumferential direction. Adjacent elongated through holes are connected from their respective outer circumferential edges to form voids extending close to each other. A pair of arc-shaped voids are formed in the radial direction between the teeth and the voids connected to the elongated through holes. Bridge portions are formed between the elongated through holes and the arc-shaped voids, and between the pair of arc-shaped voids.

[0010] A stator structure according to one aspect of the present invention can suppress a decrease in the angle detection accuracy of a resolver. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a plan view of a resolver according to an embodiment. [Figure 2] FIG. 2 is a partially enlarged view of the stator core. [Figure 3] FIG. 3 is a diagram showing an example of the detailed shape of the arc-shaped gaps in the stator core. [Figure 4] FIG. 4 is a partially enlarged view showing an example of the flow of external magnetic flux in a resolver. [Figure 5] FIG. 5 is a partially enlarged view showing an example of the flow of excitation magnetic flux in a resolver. [Figure 6] FIG. 6 is a plan view of a resolver of a first comparative example (Patent Document 1). [Figure 7] FIG. 7 is a partially enlarged view showing an example of the flow of external magnetic flux in a resolver of a second comparative example which is a modification of the first comparative example. [Figure 8] FIG. 8 is a partial enlarged view showing an example of the flow of excitation magnetic flux in a resolver of the second comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0012] A resolver stator structure and a resolver according to an embodiment will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments. Furthermore, the dimensional relationships and ratios of elements in the drawings may differ from reality. The dimensional relationships and ratios may differ between the drawings. Furthermore, the content described in one embodiment or modified example is, in principle, applicable to other embodiments or modified examples as well.

[0013] Fig. 1 is a plan view of a resolver 1 according to one embodiment. Fig. 2 is a partially enlarged view of a stator core 3, which is a component of the resolver 1. Note that in Fig. 2, a stator winding 5 is shown in cross section. In Figs. 1 and 2, the resolver 1 includes a stator 2 and a rotor 8.

[0014] (Stator structure) The stator 2 includes a stator core 3, a stator winding 5 wound around the teeth 3b of the stator core 3 via an insulator 4, and a terminal block 6 equipped with terminal pins 7 to which the ends of the stator winding 5 are connected.

[0015] The stator core 3 is formed by stacking multiple flat cores made of electromagnetic steel sheets in the axial direction. The stator core 3 has an annular main body 3a and multiple (14 in the figure) teeth 3b extending radially inward from the inner peripheral edge of the main body 3a. The annular main body 3a has multiple elongated through holes 3d of the same shape formed at equal intervals along the circumferential direction, and these elongated through holes 3d are formed on the circumference of a circle centered at the center of the stator core 3 (which coincides with the rotation center 8a of the rotor 8).

[0016] The elongated through-holes 3d are used as holes for inserting bolts to fix the stator core 3 of the stator 2 to a housing (not shown). A plurality of notches 3c are formed on the outer periphery of the annular main body 3a. The notches 3c engage with positioning pins and are used to position the stator core 3 when fixing the stator 2 to the housing.

[0017] A stator winding 5 is wound around each tooth 3b of the stator core 3 via an insulator 4. The stator winding 5 consists of an excitation winding and an output winding. The output winding outputs a two-phase output signal, consisting of a winding that outputs a cos phase and a winding that outputs a sine phase. The terminals of the end wires 5a of the stator winding 5 are intertwined and connected to predetermined terminal pins 7 arranged on a terminal block 6 for electrical connection. The stator core 3 is inserted into the insulator 4, and the terminal block 6 is also formed integrally with the insulator 4 at the same time the insulator is molded.

[0018] A plurality of circular through holes 3g are formed in the circumferential direction between the base of each tooth 3b and the elongated through hole 3d. These circular through holes 3g are also used as holes for inserting slack forming pins (not shown) for forming slack in the end wire 5a of the stator winding 5 when the end wire 5a of the stator winding 5 is twisted and connected to the terminal pin 7 of the terminal block 6.

[0019] Between adjacent elongated through holes 3d, a gap 3e extends from the outer periphery of the opposing elongated through holes 3d so as to connect and approach each other. This gap 3e is formed on the same circumference as the elongated through holes 3d.

[0020] A pair of arc-shaped voids 3f are formed between the teeth 3b and voids 3e, which are connected to each other from the outer periphery of the elongated through-hole 3d and are close to each other, and bridges 3h, 3i are formed between the arc-shaped voids 3f and between the elongated through-hole 3d and the arc-shaped voids 3f, respectively. The shortest dimensions of these bridges 3h, 3i are set to be approximately the same.

[0021] When a virtual line is drawn from the center of the stator core 3 toward the outer periphery, the gaps 3e formed by connecting the outer peripheries of the slot-shaped through holes 3d and the arc-shaped gaps 3f are nested within each other, so the line passes through one of the gaps. This effectively blocks the penetration of external magnetic flux. Meanwhile, bridge portions 3h are formed between the arc-shaped gaps 3f. Therefore, when a virtual line is drawn from the center of the stator core 3 toward the outer periphery, the line passes through the bridge portions 3h. However, the circumferential dimension of the bridge portions 3h is set to be approximately the same as the shortest dimension between the slot-shaped through holes 3d and the bridge portions 3i formed between the slot-shaped through holes 3d and the arc-shaped gaps 3f, so the line blocks the penetration of external magnetic flux.

[0022] Although it is possible to eliminate the bridge portion 3h between the arc-shaped voids 3f and combine the pair of voids 3f into one void, the size of the bridge portion 3i formed between the elongated through hole 3d and the arc-shaped void 3f is set small, which may reduce the strength of the stator core 3. For this reason, by forming the bridge portion 3h between the pair of arc-shaped voids 3f, it is possible to prevent a reduction in strength. Although no circular through hole 3g is formed on the base side of the tooth 3b where the pair of arc-shaped voids 3f is formed, it may be formed there.

[0023] (Rotor structure) A rotor 8, which is coupled to the outer peripheral surface of a shaft 10 of a rotating electrical machine (for example, a motor) and rotates around a rotation center 8a, includes a rotor core 9. The rotor 8 is disposed inside the stator core 3, and constitutes an inner rotor type variable resolver.

[0024] The rotor core 9 is made up of a plurality of flat cores made of electromagnetic steel sheets stacked together, and has a plurality of protrusions on the outer circumferential surface of the rotor core 9. The rotor core 9 in the figure has a shaft angle multiplier of 3X.

[0025] (arc-shaped gap shape) 3 is a diagram showing a detailed example of the shape of the arc-shaped gap 3f of the stator core 3. The arc-shaped gap 3f has an arc shape that follows an imaginary circle C1 whose center is the center 3k of a slot 3j formed between adjacent teeth 3b of the stator core 3 and whose radius is a distance equal to or greater than the midpoint of the width of the tooth 3b. In FIG. 3, the arc-shaped gap 3f has an arc shape that follows the imaginary circle C1 whose radius extends to the width of the tooth 3b. Furthermore, the center 3k of the slot 3j is positioned along an imaginary circle C2 whose center is the center of the stator core 3.

[0026] Because a bridge portion 3i is formed between the arc-shaped void 3f and the elongated through hole 3d, the arc-shaped void 3f is set within a range that maintains the core strength between the elongated through hole 3d and the arc-shaped void 3f. Furthermore, the radial width of the arc-shaped void 3f is not particularly limited as long as the arc-shaped void 3f can function as a flux barrier. The width of the bridge portion 3h formed between adjacent arc-shaped voids 3f is set to provide magnetic resistance that can prevent external magnetic flux from penetrating into the internal region of the stator core 3.

[0027] (External magnetic flux flow, excitation magnetic flux flow) FIG. 4 is a partially enlarged view showing an example of the flow of external magnetic flux in the resolver 1 of the embodiment, and is a diagram obtained by computer simulation of a magnetic field analysis of the state in which leakage magnetic flux from a rotating electric machine flows into the resolver 1. The curved line shown in the stator core 3 represents the external magnetic flux. FIG. 5 is a partially enlarged view showing an example of the flow of excitation magnetic flux in the resolver 1, and is a diagram obtained by computer simulation of a magnetic field analysis of the state in which excitation magnetic flux flows when a predetermined voltage is applied to the excitation winding of the stator winding 5. The characteristics of the flow of external magnetic flux and the flow of excitation magnetic flux will be described later in comparison with a comparative example.

[0028] (Comparative Example) FIG. 6 is a plan view of a resolver 3′ of a first comparative example (Patent Document 1). In FIG. 6, the stator structure 1′ includes a stator core 10′ having an annular main body 11′ and a plurality of teeth 12′ extending radially from the main body 11′ and arranged circumferentially around the main body 11′. The main body 11′ is formed in an arc shape along the circumferential direction of the main body 11′ and has a plurality of elongated holes 13′ arranged circumferentially around the main body 11′, and a plurality of holes 14′ arranged circumferentially around the main body 11′ between the plurality of teeth 12′ and the plurality of elongated holes 13′ in the radial direction of the main body 11′. At least one of the holes 14′ is disposed between a beam 15′ provided between adjacent elongated holes 13′ and a tooth 12′ adjacent to the beam 15′, and the plurality of holes 14′ are arranged at equal angular intervals along the circumferential direction of the main body 11′.

[0029] In Figure 6, reference numeral 2' denotes a rotor, reference numeral 2a' denotes a protrusion, reference numeral 20' denotes an insulator, reference numeral 30' denotes a winding, reference numeral 31' denotes a coil, reference numeral 40' denotes a terminal block portion, reference numeral 41' denotes a terminal, reference numeral 41a' denotes a entanglement portion, reference numeral 42' denotes a guide portion, reference numeral 43' denotes an insertion hole, reference numeral 50' denotes a lead wire holding portion, reference numeral 51' denotes an insertion portion, and reference numeral 101' denotes an output shaft.

[0030] This reduces variations in the influence of leakage flux that infiltrates from the entire outer periphery of the teeth 12' arranged side by side on the entire inner periphery on the coils 31' wound around the teeth 12'.

[0031] FIG. 7 is a partially enlarged view showing an example of the flow of external magnetic flux in a resolver 1" of a second comparative example that is a modification of the first comparative example, and is a diagram obtained by computer simulation to analyze the magnetic field in which leakage magnetic flux from a rotating electric machine flows into the resolver 1". FIG. 8 is a partially enlarged view showing an example of the flow of excitation magnetic flux in a resolver 1" of the second comparative example, and is a diagram obtained by computer simulation to analyze the magnetic field in which excitation magnetic flux flows when a predetermined voltage is applied to the excitation winding of the stator winding 5". Since no notch is provided in the first comparative example of FIG. 6, a notch 3c" is provided in the second comparative example to facilitate comparison with the embodiment. Note that the antenna into which external magnetic flux enters is not limited to a notch, and external magnetic flux can enter even without a notch. Also, the reference numerals of the various parts have been changed to those closer to those in the embodiment.

[0032] (Regarding suppression of magnetic flux penetrating from the outer periphery of the stator structure to the inner periphery of the stator core) In the second comparative example of Figure 7, in the outer peripheral region of a stator core 3" of a resolver 1" the same shaped elongated through holes 3d" are arranged at equal intervals along the circumferential direction, and notches 3c" are arranged between adjacent through holes 3d". In addition, in the outer region of the base of teeth 3b", the same shaped circular through holes 3g" are arranged at equal intervals along the circumferential direction. These elongated through holes 3d" and circular through holes 3g" both act as flux barriers.

[0033] As shown in FIG. 7, the corners of the notches 3c" formed on the outer peripheral edge of the stator core 3" of the resolver 1" act as antennas, and external magnetic flux entering from the outside (rotating electric machine) enters the inner peripheral region of the stator core 3" through adjacent elongated through holes 3d", and part of the entering external magnetic flux passes through the circular through holes 3g" to link with the stator winding 5" and return.

[0034] When part of the external magnetic flux that has entered the inner peripheral region of the stator core 3'' interlinks with the stator winding 5'', it is superimposed as a noise component on the waveform of the signal output from the output winding of the stator winding 5'', which causes a decrease in the angle detection accuracy of the resolver 1''.

[0035] As described above, in the resolver 1'' of the second comparative example shown in FIG. 7, it is difficult to prevent the external magnetic flux that has entered from the outer peripheral region of the stator core 3'' from entering the inner peripheral region of the stator core 3''.

[0036] In contrast, in the embodiment shown in FIG. 4, the stator core 3 of the resolver 1 has elongated through holes 3d of the same shape arranged at equal intervals along the circumferential direction in its outer peripheral region, with notches 3c between adjacent elongated through holes 3d. Adjacent elongated through holes 3d have gaps 3e extending from the outer peripheral edges of the through holes 3d so that they connect and approach each other. A pair of arc-shaped gaps 3f are formed between the teeth 3b and the gaps 3e, which are formed so that they connect and approach each other from the outer peripheral edges of the elongated through holes 3d. These gaps 3f are nested in the radial direction, and a bridge portion 3h is formed between the pair of arc-shaped gaps 3f. The elongated through holes 3d and the arc-shaped gaps 3f together function as flux barriers. A small gap is provided between the elongated through holes 3d and the arc-shaped gaps 3f, forming a bridge portion 3i.

[0037] In FIG. 4, the corners of the notches 3c formed on the outer peripheral edge of the stator core 3 of the resolver 1 act as antennas, and external magnetic flux entering from the outside (rotating electric machine) enters the inner peripheral region of the stator core 3 between adjacent elongated through holes 3d. However, since the gaps 3e extending continuously from the outer peripheral edges of the elongated through holes 3d and one side of the pair of arc-shaped gaps 3f are nested, the penetration of external magnetic flux into the inner peripheral side is suppressed.

[0038] Furthermore, a bridge portion 3h is formed between the pair of arc-shaped gaps 3f, but because the bridge portion 3h is a small gap, it prevents external magnetic flux from penetrating into the inner peripheral region of the stator core 3. In other words, because the gap is small, the magnetic resistance of the bridge portion 3h is high, and external magnetic flux cannot pass through the bridge portion 3h. Therefore, external magnetic flux that has penetrated from the outer peripheral region of the stator core 3 and passed between the adjacent elongated through holes 3d is prevented from penetrating into the inner peripheral region of the stator core 3 at approximately the location of the pair of arc-shaped gaps 3f and returns.

[0039] As a result, the external magnetic flux that has entered from the outer periphery of the stator core 3 is prevented from entering the inner periphery of the stator core 3 and is prevented from interlinking with the stator winding 5, so that it is not superimposed as a noise component on the waveform of the signal output from the output winding of the stator winding 5, and there is no risk of the angle detection accuracy of the resolver 1 being reduced.

[0040] (Regarding suppressing disturbances in the path of the excitation magnetic flux generated by the excitation winding) In the second comparative example of Figure 8, in the outer peripheral region of a stator core 3" of a resolver 1" the same shaped elongated through holes 3d" are arranged at equal intervals along the circumferential direction, and notches 3c" are arranged between adjacent elongated through holes 3d". In addition, in the outer region of the base of teeth 3b", the same shaped circular through holes 3g" are arranged at equal intervals along the circumferential direction. These elongated through holes 3d" and circular through holes 3g" both act as flux barriers.

[0041] When a predetermined excitation voltage is applied to the excitation winding of the stator winding 5" wound around the tooth 3b", an excitation magnetic flux is generated and magnetic poles are formed at both ends of the excitation winding (stator winding 5"). The excitation magnetic flux flows through the tooth 3b", exits from one end of the excitation winding (stator winding 5"), and flows into one end of the excitation winding (stator winding 5") wound around the adjacent tooth 3b". Furthermore, the excitation magnetic flux exiting from the other end of the excitation winding (stator winding 5") wound around the adjacent tooth 3b" flows into the other end of the excitation winding (stator winding 5").

[0042] In the region between the base of the tooth 3b" and the elongated through hole 3d", which is close to the inner periphery of the stator core 3", a plurality of circular through holes 3g" are formed at equal intervals along the circumferential direction. This region acts as a core back portion that forms the main magnetic path of the excitation magnetic flux generated in the excitation winding. However, the circular through holes 3g" act as a flux barrier, obstructing the flow of the excitation magnetic flux from one tooth 3b" to the other tooth 3b", causing the flow of the excitation magnetic flux to bulge outward and become significantly disturbed. In other words, the circular through holes 3g" prevent the excitation magnetic flux from flowing in a perfect semicircle, causing it to bulge outward with significant disturbance. When the excitation magnetic flux is significantly disturbed, external magnetic flux that has entered the stator core 3" from the outside is likely to be superimposed on the excitation magnetic flux, causing variations in the excitation magnetic flux and potentially reducing the angular accuracy of the resolver 1".

[0043] 5, gaps 3e extend between adjacent elongated through holes 3d from the outer peripheries of the opposing elongated through holes 3d so as to connect and approach each other, a pair of arc-shaped gaps 3f are provided on the inner periphery of the area where the adjacent elongated through holes 3d face each other, and a bridging portion 3h is provided between the pair of arc-shaped gaps 3f. A bridging portion 3i is provided between the elongated through hole 3d and the arc-shaped gap 3f.

[0044] When a predetermined excitation voltage is applied to the excitation winding of the stator winding 5 wound around the teeth 3b, an excitation magnetic flux is generated, and magnetic poles are formed at both ends of the excitation winding (stator winding 5). The excitation magnetic flux flows through the teeth 3b, which act as the iron core of the coil, exits one end of the excitation winding (stator winding 5), and flows into one end of the excitation winding (stator winding 5) wound around the adjacent tooth 3b. Furthermore, the excitation magnetic flux exiting from the other end of the excitation winding (stator winding 5) wound around the adjacent tooth 3b flows into the other end of the excitation winding (stator winding 5).

[0045] The excitation magnetic flux flows from one end of adjacent teeth 3b to the other end, flows densely at the innermost circumference of the stator core 3, and gradually becomes sparser from the innermost circumference of the stator core 3 toward the radially outer side, flowing in a semicircular arc shape.

[0046] Although the excitation magnetic flux is slightly disturbed by the circular through-hole 3g, the elongated through-hole 3d, the bridge portion 3i, the arc-shaped air gap 3f, and the bridge portion 3h prevent the excitation magnetic flux from bulging outward, and the arc-shaped air gap 3f in particular has a shape that is suitable for the excitation magnetic flux to flow in a semicircular arc, so the flow of the excitation magnetic flux is not significantly disturbed. As a result, external magnetic flux that has entered the stator core 3 from the outside does not superimpose on the excitation magnetic flux, so there is no variation in the excitation magnetic flux and there is no risk of the angle accuracy of the resolver 1 decreasing.

[0047] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention.

[0048] As described above, the stator structure according to the embodiment includes a stator core having an annular main body and a plurality of teeth extending radially inward from the periphery of the main body and arranged at equal intervals along the circumferential direction, and a stator winding wound around the teeth, the main body having a plurality of elongated through holes arranged at equal intervals along the circumferential direction, adjacent elongated through holes connecting from their respective outer peripheries to form gaps extending close to each other, a pair of arc-shaped gaps are formed radially between the teeth and the gaps connecting the elongated through holes, and bridges are formed between the elongated through holes and the arc-shaped gaps and between the pair of arc-shaped gaps, respectively, thereby suppressing a decrease in the angle detection accuracy of the resolver.

[0049] Furthermore, when an imaginary straight line is drawn from the center of the stator core toward the outer periphery of the stator core, the gaps connected to the slot-shaped through-holes and the arc-shaped gaps are nested, and the gaps are positioned so that the straight line passes through one of the gaps, thereby effectively blocking the intrusion of external magnetic flux.

[0050] The arc-shaped gap has a shape that follows an imaginary circle whose center is the center of the slot formed between adjacent teeth and whose radius is a distance equal to or greater than the midpoint of the width of the teeth, thereby suppressing disturbance of the excitation magnetic flux.

[0051] The stator core also has a plurality of circular through holes formed along the circumferential direction on the outer periphery of the teeth, which can be used as holes for inserting slack-forming pins to form slack in the end wires of the stator windings.

[0052] The present invention also provides a resolver that detects angles, comprising the stator structure and a rotor disposed inside the stator structure.

[0053] Furthermore, the present invention is not limited to the above-described embodiments. Configurations in which the above-described components are appropriately combined are also included in the present invention. Furthermore, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the above-described embodiments, and various modifications are possible. [Explanation of symbols]

[0054] 1 resolver, 2 stator, 3 stator core, 3a main body, 3b teeth, 3c notch, 3d through hole, 3e gap, 3f gap, 3g through hole, 3h bridge portion, 3i bridge portion, 3j slot, 3k center, 4 insulator, 5 stator winding, 5a end wire, 6 terminal block, 7 terminal pin, 8 rotor, 8a center of rotation, 9 rotor core, 10 shaft

Claims

1. a stator core having an annular main body portion and a plurality of teeth extending radially inward from a periphery of the main body portion and arranged at equal pitches along a circumferential direction; a stator winding wound around the teeth, the main body portion has a plurality of elongated through holes arranged at equal intervals along the circumferential direction, The adjacent elongated through holes are connected to each other from their outer circumferential edges to form gaps extending close to each other, a pair of arc-shaped gaps are formed between the teeth and the gaps connected to the elongated through holes in the radial direction; a bridge portion is formed between the elongated through hole and the arc-shaped gap, and between the pair of arc-shaped gaps, Resolver stator structure.

2. When an imaginary straight line is drawn from the center of the stator core toward the outer periphery of the stator core, the void connected to the elongated through hole and the arc-shaped void are nested, and the voids are positioned such that the straight line passes through one of the voids. The resolver stator structure according to claim 1 .

3. The stator core has a plurality of circular through holes formed along a circumferential direction on an outer circumferential side of the teeth. The resolver stator structure according to claim 1 or 2.

4. A stator structure according to any one of claims 1 to 3; a rotor disposed inside the stator structure; Resolver.

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