JP2021182785A - Stator for rotary machine - Google Patents

Abstract

To provide a stator for a rotary machine capable of attaining reduction of cost.SOLUTION: The present invention relates to a stator for a rotary machine constituted of: a multilayer core which is formed by laminating steel plates and includes a plurality of magnetic pole teeth; a plurality of bobbins disposed oppositely to the magnetic pole teeth of the multilayer core and constituted of an insulation material; magnetic substances disposed in the bobbins; and a magnet wire wound around the bobbins. An inner peripheral surface of the magnetic substance is opposed to a magnet of a rotor disposed in an inner peripheral part of the stator, and one end face of the magnetic substance in an axial direction is disposed in contact with an end face of the multilayer core.SELECTED DRAWING: Figure 2

Description

The present application relates to a stator of a rotating machine.

As a conventional technique, there are stators of electric motors, generators, and other rotary machines. For example, both ends of a laminated core formed by laminating steel plates are sandwiched between core components made of magnetic powder to form a stator core. As a result, it is possible to manufacture a stator core that is inexpensive and has a high degree of freedom in shape, as compared with the case where the entire stator core is manufactured of magnetic powder. (See Patent Document 1)

Japanese Unexamined Patent Publication No. 2004-201483 Japanese Unexamined Patent Publication No. 2003-235187 Japanese Unexamined Patent Publication No. 2009-171720

In the shape of the stator core formed of the annular magnetic powder as shown in the conventional patent document 1 described above, since the outer peripheral annular portion needs to be formed of the magnetic powder, the volume of the magnetic powder component. Could not be made sufficiently small, which was a problem in terms of cost.

Further, for example, a form in which a thin-walled connecting portion of a linear laminated core generally called a pokipoki core is bent to form a circle as shown in Patent Document 2, or a form generally referred to as a divided core as shown in Patent Document 3. When the form of Patent Document 1 is applied to a stator core having a configuration in which the outer ring portion is premised to be bent or divided, such as a form in which a plurality of laminated cores are combined to form a circle. There are problems such as the thin-walled connecting portion being damaged at the time of bending due to insufficient strength of the magnetic powder, and the cost or assembling property being deteriorated by separately producing the magnetic powder.

The present application discloses a technique for solving the above-mentioned problems, and an object thereof is to provide a stator of a rotary machine capable of cost reduction.

The stator of the rotary machine disclosed in the present application is formed by laminating steel plates, and is arranged so as to face each other to a laminated core having a plurality of magnetic pole teeth portions and the magnetic pole teeth portions of the laminated core, and is made of an insulating material. It is a stator of a rotating machine composed of a plurality of configured bobbins, a magnetic material arranged in each of the bobbins, and a magnet wire wound around the bobbins, and the inner peripheral surface of the magnetic material is the said. It faces the magnet of the rotor arranged on the inner peripheral portion of the stator, and one end surface of the magnetic body in the axial direction is arranged in contact with the end surface of the laminated core.

According to the stator of the rotary machine disclosed in the present application, it is possible to obtain the stator of the rotary machine capable of reducing the cost.

It is a structural view which shows the stator of the rotary machine according to Embodiment 1, (a) is the plan view which shows the core shape, and (b) is the perspective view which shows the mode of bobbin mounting to each magnetic pole tooth. It is a structural view which shows the stator of the rotary machine according to Embodiment 1, (a) is a perspective view which shows a bobbin, (b) is a perspective view which shows a magnetic material, (c) is a sectional view. It is a structural drawing which shows the stator of the rotary machine according to Embodiment 2, (a) is a perspective view which shows a bobbin, (b) is a perspective view which shows a magnetic material, (c) is a sectional view. It is a structural drawing which shows the stator of the rotary machine according to Embodiment 3, (a) is a perspective view which shows a bobbin, (b) is a perspective view which shows a magnetic material, (c) is a sectional view. It is a structural diagram which shows the stator of the rotary machine according to Embodiment 3, (a) is the front view which shows the winding state of a laminated core, and (b) is the front view which shows the winding state of a laminated core.

Embodiment 1.
The first embodiment will be described with reference to FIGS. 1 and 2. 1A and 1B are structural views showing a stator of a rotary machine according to the first embodiment, FIG. 1A is a plan view showing a core shape, and FIG. 1B is a perspective view showing a mode of mounting a bobbin on each magnetic pole tooth. 2A and 2B are structural views showing a stator of a rotary machine according to the first embodiment, FIG. 2A is a perspective view showing a bobbin, FIG. 2B is a perspective view showing a magnetic material, and FIG. 2C is a cross-sectional view. In each figure, the same or corresponding members and parts will be described with the same reference numerals.

It should be noted that the first embodiment is applied to a stator formed of a generally-called Poki Poki core, which is equipped with, for example, a brushless motor as a rotating machine.

First, with respect to FIG. 1, the laminated core 3 has a back yoke portion 3a forming an annular joint iron portion of the laminated core 3 and a magnetic pole around which a magnet wire 4 protruding inward from the back yoke portion 3a is wound. It is composed of a tooth portion 3b and a thin-walled connecting portion 3d provided at one end of an end portion of an adjacent back yoke portion 3a. The laminated core 3 is connected in an annular shape by rotating around the thin-walled connecting portion 3d, and is connected to the welded portion 3e to form the annular laminated core 3.

Further, as shown in FIG. 1A, the laminated core 3 is manufactured by pressing an electromagnetic steel sheet in a state where each magnetic pole tooth portion 3b is linearly developed so as to be substantially parallel to each other. The back yoke portion 3a, the thin-walled connecting portion 3d, and the arcuate magnetic pole tooth surface 3c are also manufactured by pressing an electromagnetic steel sheet.

In FIG. 1B, the magnetic pole teeth fitting portion 1A1 of the bobbin 1A shown in FIG. 2A is fitted to one end in the axial direction of each magnetic pole tooth portion 3b of the laminated core 3, and each of the laminated cores 3 is fitted. The state in which the magnetic pole tooth fitting portion 1B1 of the bobbin 1B shown in FIG. 2A is fitted to the other end of the magnetic pole tooth portion 3b in the axial direction is shown, and the bobbin 1A and the bobbin 1B are arranged so as to face each other. .. The bobbin 1A and the bobbin 1B have the same shape, the bobbin 1A is integrated with the magnetic material 2A of FIG. 2B by insert molding, and the bobbin 1B is integrated with the magnetic material 2B of FIG. 2B by insert molding. It shows the case of being integrated.

In a state where the bobbin 1A and the bobbin 1B are fitted to both ends of each magnetic pole tooth portion 3b in the axial direction, as shown in FIG. The magnet wire 4 is wound around the bobbin.

Here, the terminal of the wound magnet wire 4 may be independent for each magnetic pole tooth portion 3b, or may be provided with a crossover detour portion on each of the bobbins 1A and 1B so as to crossover by a crossover. good. After the magnet wire 4 is wound, it is rotated around each thin-walled connecting portion 3d of the laminated core 3 to be connected in an annular shape, and is welded and connected at the welded portion 3e to form an annular laminated core 3. By forming the annular laminated core 3, an annular stator is formed.

As shown in FIG. 2 (c), the magnet 5 is arranged on the outer periphery of the rotor 6 fixed to the shaft 7. Through a gap on the outer peripheral side of the magnet 5. An annular stator formed by the annular laminated core 3 is arranged.

The magnetic material 2A arranged on the bobbin 1A and the magnetic material 2B arranged on the bobbin 1B are arranged so as to face the outer peripheral surface of the magnet 5, and the magnetic material 2A of the bobbin 1A and the magnetic material 2B of the bobbin 1B are laminated cores 3. It is arranged in the same plane as the magnetic pole tooth surface 3c of.

Further, the relationship between the axial length L3 of the magnetic body 2A inserted into the bobbin 1A and the magnetic body 2B inserted into the bobbin 1B and the axial length L2 of the magnet 5 is as shown in FIG. 2 (c).
L3 ≧ L2 ・ ・ ・ (1)
However, L2> L1 ... (2)
It is preferable that the relationship is the axial length.

The magnetic body 2A and the magnetic body 2B having the above-mentioned axial length relationship are insert-molded into bobbins 1A and bobbin 1B, respectively. When these bobbins 1A and bobbin 1B are assembled to the laminated core 3, the magnetic body 2A and the magnetic body 2B overhang from the laminated core 3, so that the magnetic flux of the magnet 5 can be efficiently converged, and the product of the laminated core 3 can be efficiently converged. The thickness can be reduced and the cost can be reduced. Moreover, since the space of the coil end portions 1Ab and 1Bb can be used, it is possible to reduce the size of a rotating machine such as a motor, reduce copper loss, and improve output performance.

Further, by inserting the magnetic material 2A into the bobbin 1A and inserting the magnetic material 2B into the bobbin 1B, the number of parts at the time of assembly is reduced, the assembly workability is improved, and the magnet wires 4 are used for the bobbins 1A and 1B. Since the magnetic bodies 2A and 2B are also fixed to the laminated core 3 at the same time by winding through the laminated core 3, the fixed structure can be omitted between the magnetic bodies 2A and 2B and the laminated core 3, and the structure becomes easy. ..

Since the shapes of the bobbins 1A and 1B can be assembled to any stator core form such as an annular core, a split core, and a pokipoki core, the winding of the magnet wire 4 at a high space factor of the split core and the pokipoki core. It can be wound without sacrificing possible advantages.

The bobbins 1A and 1B are formed of synthetic resins such as PPS (polyphenylene sulfide), PA (polyamide / Polyamide), and ABS (acrylonitrile butadiene styrene / Acrylonitrile Butadiene Styrene), and the magnetic materials 2A and 2B are laminated. It is formed of steel plate and powder metallurgy. If the magnetic bodies 2A and 2B are preferably formed of a dust core, the degree of freedom in shape can be improved for the laminated steel sheet, and iron loss can be reduced for powder metallurgy other than the powder iron core.

The shapes of the magnetic bodies 2A and 2B are not limited to the plate-shaped magnetic material having an arc shape on the inner and outer circumferences as shown in FIGS. 1 and 2. Further, when the magnetic bodies 2A and 2B of the first embodiment shown in FIG. 2 have a plate shape having an arc shape on the inner and outer circumferences, the shape is simple and the productivity is good. Further, since the volumes of the magnetic bodies 2A and 2B can be made larger, the advantage of being able to converge a large amount of magnetic flux can be obtained.

In this way, by forming the bobbin to be assembled to each magnetic pole tooth by insert molding a magnetic material into an insulating material, the effect of cost reduction or motor efficiency improvement as described in Patent Document 1 can be obtained, and the Pokipoki core can be obtained. , It can also be applied to a stator form such as a split core. Further, the volume of the magnetic material to be inserted can be minimized, or the man-hours for assembling the magnetic material can be reduced to further reduce the cost.

Embodiment 2.
3A and 3B are structural views showing a stator of a rotary machine according to the second embodiment, FIG. 3A is a perspective view showing a bobbin, FIG. 3B is a perspective view showing a magnetic material, and FIG. 3C is a cross-sectional view.

In the above-described first embodiment, the case where the magnetic bodies 2A and 2B have a plate shape having an arc shape has been described. However, in the second embodiment, as shown in FIG. 3, the bobbin 10A has a magnetic pole tooth fitting portion 10A1. And a frustum-shaped portion 10A2, and the bobbin 10B has a magnetic pole tooth fitting portion 10B1 and a frustum-shaped portion 10B2. Further, the magnetic body 20A has a frustum-shaped portion 20A1 so as to match the frustum-shaped portion 10A2 of the bobbin 10A without a gap, and the magnetic body 20B has a frustum-shaped portion so as to fit the frustum-shaped portion 10B2 of the bobbin 10B without a gap. It has a part 20B1. Note that 10Ab and 10Bb indicate the coil end portion. Further, the magnetic bodies 20A and 20B may be polygonal columnar portions having an arc shape on the inner circumference.

By providing the cone-shaped portions 20A1 and 20B1 having an arc shape on the inner circumference of the magnetic material 20A and the inner circumference of the magnetic material 20B, respectively, the amount of material used can be further reduced, so that a high-cost material such as a dust core can be used. Is particularly advantageous when using the magnet, and further, the degree of freedom in the shape configuration of the wire storage portions 10Aa and 10Ba of the bobbins 10A and 10B around which the magnet wire 4 is wound is improved, and the magnet with a higher space factor is used. The wire 4 can be wound.

The bobbins 10A and 10B are formed of synthetic resins such as PPS, PA and ABS similar to those of the first embodiment described above, and the magnetic materials 20A and 20B are formed of laminated steel plates and powder metallurgy. If the magnetic bodies 20A and 20B are preferably formed of a dust core, the degree of freedom in shape can be improved for the laminated steel sheet, and iron loss can be reduced for powder metallurgy other than the powder iron core.

Embodiment 3.
4A and 4B are structural views showing a stator of a rotary machine according to the third embodiment, FIG. 4A is a perspective view showing a bobbin, FIG. 4B is a perspective view showing a magnetic material, and FIG. 4C is a cross-sectional view. 5A and 5B are structural views showing the stator of the rotary machine according to the third embodiment, FIG. 5A is a front view showing the winding state of the conventional laminated core, and FIG. 5B is the winding of the laminated core according to the third embodiment. It is a front view which shows the state.

In the second embodiment described above, the case where the magnetic bodies 20A and 20B are provided with the frustum-shaped portions 20A1 and 20B1 having an arc shape has been described, but the third embodiment has the bobbin 100A as shown in FIG. Has a magnetic pole tooth fitting portion 100A1 and a frustum-shaped portion 100A2, and the bobbin 100B has a magnetic pole tooth fitting portion 100B1 and a frustum-shaped portion 100B2. Note that 100Ab and 100Bb indicate the coil end portion.

Further, the magnetic body 200A has a frustum-shaped portion 200A1 so as to match the frustum-shaped portion 100A2 of the bobbin 100A without a gap, and the magnetic body 200B has a frustum-shaped portion so as to fit the frustum-shaped portion 100B2 of the bobbin 100B without a gap. It has a part 200B1. Further, axial length portions 200A2 and 200B2 extending in the axial direction are provided from the frustum-shaped portions 200A1 and 200B1, respectively.

That is, the magnetic bodies 200A and 200B are configured to have an L-shaped cross section, respectively, and the magnetic bodies 200A and 200B are inserted into the magnetic pole tooth fitting portions 100A and 100B1 of the bobbins 100A and 100B, respectively, and the magnetic bodies 200A and 200B are inserted into the magnetic pole teeth fitting portions 100A and 100B1. 200B is arranged in contact with both end faces of the laminated core 30. The laminated core 30 has a back yoke portion 30a, a magnetic pole tooth portion 30b, and a magnetic pole tooth surface 30c. By providing the axial length portions 200A2 and 200B2 of the magnetic bodies 200A and 200B, the laminated thickness of the laminated core 30 is thinner than that of each of the above-described embodiments.

Therefore, the relationship between the axial length L3 of the magnetic body 200A inserted into the bobbin 100A and the magnetic body 200B inserted into the bobbin 100B and the axial length L2 of the magnet 5 is as shown in FIG. 3 (c).
L3 ≧ L2 ・ ・ ・ (3)
However, L2> L11 ... (4)
It is preferable that the relationship is the axial length.

Since the magnetic bodies 200A and 200B each have an L-shaped cross section, the above-described first and second embodiments are performed with respect to the shape of the tip of the magnetic pole wire portion 30b of the L-shaped rising portion having an L-shaped cross section. Since the shape of the magnetic pole tooth portion 30b of the laminated core 30 can be configured while having the same characteristics as that of the second form, in the case of the conventional laminated core shown in FIG. 5 (a), the magnet wire 4 is attached to the magnetic pole tooth portion 3b. When winding, the space factor decreases due to the swelling, and the copper loss increases. However, in the case of the laminated core 30 of the third embodiment shown in FIG. 5B, the cross-sectional shape of the magnetic bodies 200A and 200B is set so that a magnetic path area equivalent to that of the magnetic pole wire portion 30b of the laminated core 30 can be secured. Moreover, the curvature of the magnet wire 4 at the time of winding and the curvature of the cross section of the magnetic bodies 200A and 200B are matched to reduce the gap between the magnet wire 4 and the bobbins 100A and 100B, and the space factor of the magnet wire 4 is improved. And copper loss can be reduced.

The bobbins 100A and 100B are formed of synthetic resins such as PPS, PA and ABS similar to those in the first embodiment described above, and the magnetic materials 200A and 200B are formed of laminated steel plates and powder metallurgy. If the magnetic bodies 200A and 200B are preferably formed of a dust core, the degree of freedom in shape can be improved for the laminated steel sheet, and iron loss can be reduced for powder metallurgy other than the powder core.

Although the present application describes various exemplary embodiments and examples, the various features, embodiments, and functions described in one or more embodiments are applications of a particular embodiment. It is not limited to, but can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not exemplified are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

The present application is suitable for realizing a stator of a rotary machine capable of reducing costs.

1A bobbin, 1B bobbin, 1A1 magnetic pole tooth fitting part, 1B1 magnetic pole tooth fitting part, 2A magnetic material, 2B magnetic material, 3 laminated core, 3a back yoke part, 3b magnetic pole tooth part, 3c magnetic pole tooth surface, 3d thin wall connection Part, 3e Welding part, 4 Magnet wire, 5 Magnet, 6 Rotor, 7 shaft, 10A bobbin, 10B bobbin, 10A1 magnetic pole tooth fitting part, 10A2 pyramid-shaped part, 10B1 magnetic pole tooth fitting part, 10B2 pyramid-shaped part , 20A magnetic material, 20B magnetic material, 20A1 cone-shaped part, 20B1 cone-shaped part, 30 laminated core, 30a back yoke part, 30b magnetic pole tooth part, 30c magnetic pole tooth surface, 100A bobbin, 100B bobbin, 100A1 magnetic pole tooth fitting Combined part, 100A2 bobbin, 100B1 magnetic pole tooth fitting part, 100B2 bobbin, 200A magnetic material, 200B magnetic material, 200A1 bobbin, 200A2 bobbin, 200B1 bobbin, 200B2 bobbin Department

The stator of the rotating machine disclosed in the present application, the steel sheet is formed by stacking, the magnetic poles of the multiple having magnetic teeth surface extending protruded on the inner peripheral side and the back yoke portion from the back yoke portion circumferential direction a product layer core constituted by the tooth portion, is disposed above is the magnetic pole teeth two split has been, respectively Re their facing the of the laminated core, the magnetic pole between the outer side and the inner peripheral side has a pole tooth fitting portion to be fitted to the tooth portion, and a pair of bobbins made of a insulation material, the bobbin, respectively it in the storage portion of the inner peripheral side of the emission arranged magnetic powder metallurgy A stator of a rotating machine composed of a magnetic material configured by the above and a magnet wire wound around the bobbin, and the inner peripheral surface of the magnetic material is a rotor arranged on the inner peripheral portion of the stator. and magnet facing one end surface in the axial direction of the inner peripheral side of the housing section arranged on the front Symbol magnetic of the bobbin is disposed in contact with the end face of the pole tooth face of the magnetic pole teeth of the laminated core It is a magnet.

Claims (9)

A laminated core formed by laminating steel plates and having a plurality of magnetic pole teeth portions, and a plurality of bobbins arranged opposite to each other on the magnetic pole teeth portions of the laminated core and made of an insulating material, and the bobbin. A stator of a rotating machine composed of a magnetic material arranged therein and a magnet wire wound around the bobbin, and the inner peripheral surface of the magnetic material is a rotor arranged on the inner peripheral portion of the stator. A stator of a rotating machine facing a magnet and having one end surface of the magnetic material in the axial direction in contact with the end surface of the laminated core. The plurality of bobbins are divided into two and each has a magnetic pole tooth fitting portion, the magnetic material is inserted into the bobbin, and the magnetic pole tooth fitting portion of the bobbin is fitted to the magnetic pole tooth portion. The stator of the rotary machine according to claim 1. The stator of the rotary machine according to claim 1 or 2, wherein the axial length of the magnetic material is equal to or more than the axial length of the magnet. The stator of the rotary machine according to any one of claims 1 to 3, wherein the shape of the magnetic material is a plate shape having an arc shape on the inner and outer circumferences. The one according to any one of claims 1 to 3, wherein the shape of the magnetic material is a frustum shape having an arc shape on the inner circumference or a polygonal columnar shape having an arc shape on the inner circumference. Rotator stator. The shape of the magnetic material is characterized in that it has an L-shaped cross section having a frustum-shaped portion having an arc shape on the inner circumference and an axial length portion extending in the axial direction from the frustum-shaped portion. The stator of the rotary machine according to any one of claims 1 to 3. The magnetic material is characterized in that the cross-sectional area of the surface in contact with the laminated core is the same as the cross-sectional area on the side opposite to the surface in contact with the laminated core or larger than the cross-sectional area on the side opposite to the surface in contact with the laminated core. The stator of the rotary machine according to claim 6. The stator of the rotary machine according to any one of claims 1 to 7, wherein the magnetic material is made of a laminated steel plate. The stator of the rotary machine according to any one of claims 1 to 7, wherein the magnetic material is composed of magnetic powder metallurgy.

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