阅读说明：本技术 定子构造以及旋转变压器 (Stator structure and rotary transformer ) 是由 松浦睦 中川隆 阿部纮志 铃木信也 于 2019-01-15 设计创作，主要内容包括：实施方式的定子构造(1)具备定子铁芯(10),上述定子铁芯(10)具有环状的主体部(11)和沿主体部(11)的径向延伸并沿着主体部(11)的周向排列的多个齿(12)。主体部(11)具有：多个长孔(13),其形成为沿着这样的主体部(11)的周向的圆弧状,并沿着主体部(11)的周向排列；和多个孔部(14),其在主体部(11)的径向上的多个齿(12)与多个长孔(13)之间沿着主体部(11)的周向排列。孔部(14)的至少一个配置于在邻接的长孔(13)彼此之间设置的梁部(15)与接近这样的梁部(15)的齿(12)之间。(A stator structure (1) of an embodiment is provided with a stator core (10), wherein the stator core (10) comprises an annular main body part (11) and a plurality of teeth (12) which extend in the radial direction of the main body part (11) and are arranged along the circumferential direction of the main body part (11). The main body (11) has: a plurality of elongated holes (13) formed in an arc shape along the circumferential direction of the main body (11) and arranged along the circumferential direction of the main body (11); and a plurality of holes (14) that are arranged along the circumferential direction of 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 section (15) provided between adjacent elongated holes (13) and a tooth (12) adjacent to such a beam section (15).)

1. A stator structure, characterized in that,

the stator core includes an annular main body portion and a plurality of teeth extending in a radial direction of the main body portion and arranged in a circumferential direction of the main body portion,

the main body portion has:

a plurality of elongated holes formed in an arc shape along a circumferential direction of the main body and arranged along the circumferential direction of the main body; and

a plurality of holes arranged along a circumferential direction of the main body between the plurality of teeth and the plurality of long holes in a radial direction of the main body,

at least one of the holes is disposed between a beam portion provided between the adjacent elongated holes and the tooth adjacent to the beam portion.

2. The stator construction according to claim 1,

the plurality of hole portions are arranged at equal angular intervals along a circumferential direction of the main body portion.

3. The stator construction according to claim 1 or 2,

the plurality of holes are all of the same shape.

4. The stator construction according to claim 1 or 2,

the hole portion disposed between the beam portion and the tooth adjacent to the beam portion is larger than the hole portion not disposed between the beam portion and the tooth adjacent to the beam portion.

5. A resolver is characterized by comprising:

a rotor and a stator construction as claimed in any one of claims 1 to 4.

Technical Field

The invention relates to a stator structure and a resolver.

Background

Conventionally, a resolver that detects a rotation angle of a rotating electrical machine such as a motor or a generator is known. Such a resolver includes, for example: a stator core including a plurality of teeth extending from an inner peripheral side of a main body portion formed in an annular shape toward a center; and a rotor disposed inside the stator core so as to face the teeth. The teeth are wound with windings through insulators, and such windings are composed of an excitation winding to which an excitation current is supplied from the outside and two output windings that output two-phase signals in accordance with the rotation angle of the rotor.

On the other hand, when a current flows through a winding of the rotating electrical machine, which is an object of detecting the rotation angle of the resolver, leakage flux from the winding of the rotating electrical machine may enter an output winding of the stator structure. As a result, the leakage magnetic flux may overlap the waveform of the signal output from the output winding as a noise component, and the angle detection accuracy of the resolver may be lowered. In view of this, patent document 1 proposes a resolver in which a plurality of arc-shaped openings are formed in a main body portion of a stator core along a circumferential direction, and the magnetic resistance of an outer edge of the stator core is increased by the arc-shaped openings, so that leakage magnetic flux hardly reaches the inside of the stator core, and influence of magnetism on a winding wound around a projecting magnetic pole as a tooth can be prevented.

Patent document 1: japanese patent laid-open No. 2014-150703

However, in the resolver described in patent document 1, the leakage magnetic flux enters the inner region of the stator core through the beam portion which is the gap provided between the adjacent arcuate openings, and the influence on the output winding wound around the protruding magnetic pole which is the tooth existing near such beam portion becomes large. On the other hand, the influence on the output winding wound around the projecting magnetic pole located away from the beam portion is reduced. Therefore, a difference occurs in the influence of the output winding wound around the projecting magnetic pole depending on the position of the projecting magnetic pole, and as a result, a difference occurs in the noise component for each projecting magnetic pole, and thus the angle detection accuracy of the resolver may be lowered.

Disclosure of Invention

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a stator structure and a resolver that can reduce a difference in influence of magnetic flux that intrudes from an outer peripheral side to an inner peripheral side of the stator structure on a winding that is wound around a tooth, and suppress a decrease in angle detection accuracy due to external magnetic flux.

In order to solve the above-described problems, a stator structure according to an aspect of the present invention includes a stator core having an annular main body portion and a plurality of teeth extending in a radial direction of the main body portion and arranged in a circumferential direction of the main body portion. The main body part includes: a plurality of elongated holes formed in an arc shape along a circumferential direction of the main body and arranged along the circumferential direction of the main body; and a plurality of holes arranged along the circumferential direction of the main body between the plurality of teeth and the plurality of long holes in the radial direction of the main body. At least one of the holes is disposed between a beam portion provided between the adjacent elongated holes and the tooth adjacent to the beam portion.

According to an aspect of the present invention, it is possible to suppress a decrease in angle detection accuracy caused by magnetic flux intruding from the outer circumferential side to the inner circumferential side of the stator structure.

Drawings

Fig. 1 is a plan view showing a structure of a stator structure according to an embodiment.

Fig. 2 is a cross-sectional view showing a state in which a resolver according to an embodiment is attached to a rotating electric machine.

Fig. 3 is a plan view showing a stator core according to the embodiment.

Fig. 4 is a diagram for explaining the flow of leakage magnetic flux entering the stator core according to the embodiment from the outer circumferential side to the inner circumferential side.

Fig. 5 is a plan view showing a stator core according to a modification of the embodiment.

Fig. 6 is a diagram for explaining the flow of leakage magnetic flux entering the stator core according to the modification of the embodiment from the outer circumferential side to the inner circumferential side.

Detailed Description

Hereinafter, a stator structure and a resolver according to an embodiment will be described with reference to the drawings. The stator structure and the application of the resolver are not limited to the embodiments described below. The drawings are schematic, and it should be noted that the relationship between the sizes of the elements, the ratios of the elements, and the like may be different from those in reality. Further, the drawings may include portions having different dimensional relationships and ratios from each other.

(Structure of stator and resolver)

First, the structure of the stator structure 1 and the resolver 3 according to the embodiment will be described with reference to fig. 1 and 2. Fig. 1 is a plan view showing the structure of a stator structure 1 according to the embodiment.

A resolver 3 according to an embodiment is obtained by providing a rotor 2 inside a stator structure 1 shown in fig. 1. The resolver 3 according to the embodiment is a vr (variable recovery) type resolver. For example, as shown in fig. 1, the resolver 3 is an inner rotor type resolver, and the rotor 2 is disposed inside the stator structure 1.

Fig. 2 is a cross-sectional view showing a state in which the resolver 3 according to the embodiment is attached to the rotating electric machine 100. The rotor 2 is fixed to an output shaft 101 of the rotating electric machine 100 and rotates with the rotation of the output shaft 101. Rotating electric machine 100 is, for example, an ac motor, an ac generator, an ac motor generator, or the like, and includes: an output shaft 101, a rotor 102 fixed to such output shaft 101, and a stator structure 104 having windings 103.

For example, when the rotating electrical machine 100 is an ac motor, the winding 103 of the stator structure 104 is a field winding, and a field current flows through the field winding, whereby the rotor 102 of the rotating electrical machine 100 rotates, and the output shaft 101 rotates as the rotor 102 rotates.

Further, stator structure 1 is fixed to case 105 of rotating electric machine 100 by bolts 110. The bolt 110 is formed of, for example, an iron material.

The description returns to fig. 1. The outer peripheral surface of the rotor 2 is formed into a non-circular shape that is uneven in the radial direction. The rotor 2 shown in fig. 1 has 3-position convex portions 2a on the outer peripheral surface, and the axial multiple angle of the rotor 2 is 3X. The axial multiple angle of the rotor 2 may be 1X, 2X, or 4X or more.

The rotor 2 has a laminated structure in which a plurality of core layers, which are produced by pressing steel sheets made of soft magnetic materials such as electromagnetic steel sheets, are laminated.

The stator structure 1 includes a stator core 10, an insulator 20, a winding 30, a terminal block 40, and a lead wire holding portion 50.

The stator core 10 has a laminated structure in which a plurality of steel sheets such as electromagnetic steel sheets are laminated. The stator core 10 has a main body portion 11 and a plurality of teeth 12. The body 11 is annular, and in the embodiment, is annular. The plurality of teeth 12 extend from the inner peripheral side of the main body portion 11 toward the center (i.e., radial direction) of the main body portion 11.

Hereinafter, as shown in fig. 1 and 2, the radial direction, the axial direction, and the circumferential direction of the stator core 10 will be described. Here, "radial direction" is a direction orthogonal to the rotation axis of the rotor 2 rotating inside the stator core 10, "axial direction" is a direction coinciding with the axial direction of the rotation axis of the rotor 2, and "circumferential direction" is a direction coinciding with the rotation direction of the rotor 2.

In addition, the main body portion 11 of the stator core 10 is formed with a plurality of elongated holes 13 and a plurality of holes 14. Such a plurality of long holes 13 and a plurality of hole portions 14 are formed on a concentric circle with each other. The detailed structure of the stator core 10 will be described later.

The insulator 20 is an insulating member, and is formed by injection molding of an insulating resin, for example. The insulator 20 is formed by insert molding in which the stator core 10 is embedded, for example, and covers the stator core 10 from both sides in the axial direction.

The winding 30 includes a lead wire and an insulating coating film covering the periphery of the lead wire. Such a wire is, for example, a metal wire such as a copper wire, an aluminum wire, or a brass wire. The winding 30 is wound around each of the plurality of teeth 12 via the insulator 20 to form a plurality of coils 31.

Such a coil 31 is composed of an excitation winding and an output winding. The output winding of the coil 31 is composed of a sin-phase output winding for outputting a sin-phase output signal and a cos-phase output winding for outputting a cos-phase output signal.

The terminal block portion 40 is formed on the insulator 20 and extends radially outward from the insulator 20. A plurality of (6 in the embodiment) terminals 41 are supported by the terminal block 40.

The terminal 41 is a conductive member such as a metal, and has a winding portion 41a protruding from the terminal base portion 40 in the axial direction on one end side. The ends of the windings 30 constituting the corresponding coils 31 are wound around the winding portions 41 a.

For example, the winding start of the excitation winding, the winding end of the excitation winding, the winding start of the sin phase output winding, the winding end of the sin phase output winding, the winding start of the cos phase output winding, and the winding end of the cos phase output winding are wound around the winding portions 41a of the 6 terminals 41.

The winding portion 41a around which the end of the winding 30 is wound is welded, for example, with tig (tungsten inertgas), whereby the winding 30 and the winding portion 41a can be electrically connected.

The other end of the terminal 41 is accommodated in a lead wire holding portion 50 extending radially outward from the terminal block portion 40. As shown in fig. 1, a plurality of groove-shaped insertion portions 51 are formed in the wire holding portion 50, and a wire (not shown) extending from an external device (not shown) is inserted into and held by the insertion portions 51.

Since the other end of the terminal 41 is exposed at the insertion portion 51, the lead wire can be electrically connected to the terminal 41 by inserting the lead wire into the insertion portion 51. For example, the lead wire can be electrically connected to the terminal 41 by resistance welding a portion where the lead wire and the terminal 41 are in contact with each other.

As shown in fig. 1, the coil 30 is guided by the guide portion 42 and extends from the coil 31 toward the winding portion 41a along a predetermined path. The guide portion 42 is, for example, a pin-shaped guide pin standing at a predetermined position of the terminal block portion 40. The guide portions 42 are provided independently of the plurality of windings 30 wound around the plurality of winding portions 41 a.

In the winding 30, a slack portion is formed between the coil 31 and the winding portion 41a in order to reduce the influence of thermal expansion due to temperature change. Such slack portions are formed by inserting slack pins, not shown, into a plurality of insertion holes 43 formed in the terminal block portion 40, winding the winding 30 around the winding portion 41a while hooking the slack pins, and then removing the slack pins from the insertion holes 43.

(details of stator core)

Next, details of the stator core 10 according to the embodiment will be described with reference to fig. 3 and 4. Fig. 3 is a plan view showing the stator core 10 according to the embodiment. In the example shown in fig. 3, the number of teeth 12 is 14, the number of arc-shaped elongated holes 13 is 7, and the number of holes 14 is 28, but the numbers of teeth 12, elongated holes 13, and holes 14 are not limited to the above numbers.

The elongated hole 13 can serve as an insertion hole through which a bolt 110 for fixing the resolver 3 to the housing 105 of the rotating electrical machine 100 is inserted. The elongated hole 13 penetrates in the axial direction and is formed in an arc shape along the circumferential direction of the main body 11. The plurality of elongated holes 13 are formed in rotational symmetry with respect to the center of the main body portion 11 and are arranged along the circumferential direction of the main body portion 11.

For example, as shown in fig. 3, the plurality of long holes 13 are arranged at equal angular intervals along the circumferential direction of the main body 11. The plurality of long holes 13 need not be arranged at equal angular intervals.

Further, a beam portion 15 connecting the inner peripheral portion and the outer peripheral portion of the main body portion 11 is provided between the adjacent elongated holes 13 in the main body portion 11.

The plurality of teeth 12 are arranged along the circumferential direction inside the body portion 11. The plurality of teeth 12 have: the 1 st tooth 12a existing near the beam portion 15 and the 2 nd tooth 12b existing far from the beam portion 15 and near the long hole 13. In the embodiment, the 1 st tooth 12a and the 2 nd tooth 12b are arranged alternately. Further, a socket 16 as a gap is formed between the adjacent teeth 12.

Here, when an excitation current flows through the winding 103 of the rotating electric machine 100 shown in fig. 2, leakage flux from the winding 103 of the rotating electric machine 100 may enter from the outer circumferential side to the inner circumferential side of the stator structure 1 in the resolver 3.

In the embodiment, as shown in fig. 3, the plurality of holes 14 penetrate in the axial direction and are formed in a circular shape. The plurality of holes 14 are arranged at equal angular intervals along the circumferential direction of the body 11 on the outer circumferential side of the plurality of teeth 12 and between the plurality of teeth 12 and the plurality of elongated holes 13. The plurality of holes 14 need not be arranged at equal angular intervals.

The plurality of holes 14 include: a1 st hole portion 14a disposed between the 1 st tooth 12a and the beam portion 15, a 2 nd hole portion 14b disposed between the 2 nd tooth 12b and the elongated hole 13, and a 3 rd hole portion 14c disposed between the socket 16 and the elongated hole 13. Next, an effect of the plurality of holes 14 will be described with reference to fig. 4.

Fig. 4 is a diagram for explaining the flows of leakage magnetic fluxes M1, M2 entering from the outer circumferential side to the inner circumferential side of the stator core 10 according to the embodiment. As described above, since the magnetic resistance of the long hole 13 as the gap is high, the leakage magnetic flux M1 entering the long hole 13 out of the leakage magnetic fluxes M1 and M2 entering from the outer peripheral side can be suppressed from entering the long hole 13. On the other hand, leakage flux M2 that has entered beam portion 15 does not get blocked by beam portion 15, and therefore enters the region where the plurality of holes 14 are formed.

In the embodiment, as shown in fig. 4, since the 1 st hole 14a is disposed between the 1 st tooth 12a and the beam portion 15, the leakage flux M2 enters the 1 st hole 14a without escaping from the 1 st hole and flows toward the 2 nd tooth 12b adjacent to the 1 st tooth 12a and the 1 st tooth 12a.

When the 1 st hole 14a is not provided, the leakage flux M2 that enters from the outer peripheral side of the stator core 10 through the beam portion 15 has a higher effect on the coil 31 wound around the 1 st tooth 12a, and a difference between the effect and the effect on the coil 31 wound around the 2 nd tooth 12b is larger. In contrast, in the embodiment, by providing the 1 st hole portion 14a, the influence on the coil 31 wound around the 1 st tooth 12a can be reduced, and the influence on the coil 31 wound around the 2 nd tooth 12b can be increased, so that the difference between the influence on the coil 31 wound around the 1 st tooth 12a and the influence on the coil 31 wound around the 2 nd tooth 12b is reduced.

That is, in the embodiment, the difference between the influence on the coil 31 wound around the 1 st tooth 12a and the influence on the coil 31 wound around the 2 nd tooth 12b can be reduced by reducing the influence on the coil 31 wound around the 1 st tooth 12a from the outer peripheral side of the stator core 10 and by increasing the influence on the coil 31 wound around the 2 nd tooth 12b from the outer peripheral side of the stator core 10. As a result, according to the embodiment, it is possible to suppress a decrease in angle detection accuracy due to leakage magnetic fluxes M1 and M2 entering from the outer peripheral side of the stator core 10.

In the embodiment, the plurality of holes 14 are preferably arranged at equal angular intervals in the circumferential direction of the main body 11. This reduces the difference in the influence of the leakage magnetic fluxes M1 and M2 entering the teeth 12 arranged in line along the entire inner circumference from the entire outer circumference on the coil 31 wound around the teeth 12. Therefore, according to the embodiment, the reduction in the angle detection accuracy due to the leakage magnetic fluxes M1 and M2 entering from the outer peripheral side of the stator core 10 can be further suppressed.

In the embodiment, the plurality of holes 14 are preferably all the same shape. This enables the hole 14 to be used as a part of the insertion hole 43 into which the loose pin is inserted. Therefore, according to the embodiment, the insertion hole 43 used for forming the slack portion in the winding 30 can be easily formed.

(modification example)

Next, a modification of the embodiment will be described with reference to fig. 5 and 6. In the following description, the same parts as those in the embodiments are denoted by the same reference numerals, and redundant description thereof may be omitted.

Fig. 5 is a plan view showing the stator core 10 according to the modification of the embodiment, and fig. 6 is a view for explaining flows of leakage magnetic fluxes M1, M2 entering the stator core 10 according to the modification of the embodiment from the outer peripheral side of the stator core 10.

As shown in fig. 5, in the modified example, the 1 st hole portion 14a1 having a shape different from the 2 nd hole portion 14b and the 3 rd hole portion 14c is formed in the main body portion 11 of the stator core 10. The first hole portion 14a1 of the modification is formed as an arc-shaped long hole that penetrates in the axial direction and extends along the circumferential direction of the main body 11.

That is, since the 1 st hole portion 14a1 of the modified example is formed at a larger angle in the circumferential direction than the 1 st hole portion 14a of the embodiment, as shown in fig. 6, the leakage flux M2 that invades the inner circumferential side via the beam portion 15 is blocked by the 1 st hole portion 14a1, and therefore the influence on the coil 31 wound around the 1 st tooth 12a can be further reduced.

Accordingly, the influence of leakage magnetic flux M2 on coil 31 wound around 1 st tooth 12a can be further reduced, and therefore, the difference between the influence on coil 31 wound around 1 st tooth 12a and the influence on coil 31 wound around 2 nd tooth 12b can be further reduced. Therefore, according to the embodiment, it is possible to further suppress a decrease in the angle detection accuracy due to leakage magnetic fluxes M1 and M2 entering from the outer periphery side and the inner periphery side of the stator core 10.

In the modification, the plurality of 1 st hole portions 14a1 are formed rotationally symmetrically with respect to the center of the main body 11. On the other hand, the plurality of 1 st hole portions 14a1 need not be formed rotationally symmetrically with respect to the center of the main body 11.

While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit and scope of the invention. For example, although the embodiment shows an example in which the 2 nd hole portion 14b and the 3 rd hole portion 14c are formed in the same shape, the 2 nd hole portion 14b and the 3 rd hole portion 14c may be formed in different shapes.

In the embodiment, the elongated hole 13 is formed in an arc shape, but may be formed in a straight line shape along the circumferential direction of the body 11, or may be formed in a circular shape or a square shape. In the embodiment, the hole 14 is formed in a circular shape, but the hole 14 is not limited to a circular shape, and may be a long hole or a square shape.

In the embodiment, the insulator 20 is integrally formed, but the insulator may be formed by being divided into two in the axial direction and the stator core 10 may be sandwiched between the two insulators. In the embodiment, the case where the present invention is applied to the inner rotor type resolver 3 is shown, but the present invention may be applied to an outer rotor type resolver.

As described above, the stator structure 1 according to the embodiment and the modification includes the stator core 10, and the stator core 10 includes the annular main body portion 11 and the plurality of teeth 12 extending in the radial direction of the main body portion 11 and arranged in the circumferential direction of the main body portion 11. The main body 11 includes: a plurality of elongated holes 13 formed in an arc shape along the circumferential direction of the body 11 and arranged along the circumferential direction of the body 11; and a plurality of holes 14 arranged along the circumferential direction of 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 (the 1 st hole 14a (14a1)) is arranged between the beam portion 15 provided between the adjacent elongated holes 13 and the tooth 12 adjacent to such beam portion 15. This can suppress a decrease in the angle detection accuracy due to the leakage magnetic fluxes M1 and M2 entering from the outer peripheral side.

In the stator structure 1 according to the embodiment and the modified examples, the plurality of holes 14 are arranged at equal angular intervals in the circumferential direction of the main body 11. This can further suppress a decrease in the angle detection accuracy due to the leakage magnetic fluxes M1 and M2 entering from the outer peripheral side.

In the stator structure 1 according to the embodiment, all of the plurality of holes 14 have the same shape. This makes it possible to easily form the insertion holes 43 for forming the slack portions in the windings 30 and for facilitating the manufacture of the stator core 10.

In the stator structure 1 according to the modified example, the holes (1 st hole 14a1) disposed between beam portion 15 and the tooth (1 st tooth 12a) adjacent to beam portion 15 are larger than the holes (2 nd hole 14b, 3 rd hole 14c) not disposed between beam portion 15 and the tooth (1 st tooth 12a) adjacent to beam portion 15. This can further suppress a decrease in the angle detection accuracy due to leakage magnetic fluxes M1 and M2 entering from the outer peripheral side of the stator core 10.

The number of the 3 rd hole portions 14c formed between the 1 st hole portion 14a and the 2 nd hole portion 14b is not limited to one, and the number thereof can be determined in consideration of the influence of leakage magnetic flux entering from the beam portions 15 of the stator core 10 toward the inner peripheral side of the stator core 10.

The present invention is not limited to the above embodiments. The present invention also encompasses an embodiment in which the above-described constituent elements are combined as appropriate. Further effects and modifications can be easily derived by those skilled in the art. Therefore, the present invention in its broader aspects is not limited to the above-described embodiments, and various modifications can be made.

Description of the reference numerals

A stator construction; a rotor; a rotary transformer; a stator core; a main body portion; 12.. teeth; 1 st tooth; no. 2 th tooth; a slot; a hole portion; 14a, 14a1... 1 st aperture; a No. 2 hole portion; a 3 rd hole portion; a beam section; a socket; an insulator; a winding; a coil; a terminal block portion; a wire retention portion; a rotating electrical machine; m1, M2.