JP2003304655A - Structure of stator iron core in dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the structure of a stator iron core structure for a dynamo-electric machine, which enables easy and stable junction of divided yokes and can reduce the magnetic resistance of a steel plate at a section adjacent to a butting part and has a junction structure, capable of improving iron loss property by uniformizing the magnetic flux in a yoke, in a stator iron core structure which consists of a plurality of teeth made by stacking steel plates and a roughly cylindrical yoke, and divides a yoke part in the circumferential direction into plural pieces and re-joins them together. <P>SOLUTION: The butting positions of the steel plates, opposed in the circumferential direction of the yoke part, are slid in tiers in stacking direction, and this arrangement is repeated in the stacking direction; thus a lap is made to a steel plate which adjoins it in the stacking direction and faces it in the circumferential direction, and divided yokes are butted so that the butting positions of opposed steel plates come into a saw-teeth shape in the stacking direction, in the section of the junction of the stacked steel plates. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator iron core structure including a yoke portion and a tooth portion, and more particularly to a joint structure of split yokes when the yoke portion is divided into a plurality of pieces.

[0002]

2. Description of the Related Art Conventionally, as a stator core structure for a rotating electric machine, a structure in which magnetic steel sheets having a yoke portion and a tooth portion integrally punched is laminated is generally used. In this method, since the exciting coil is inserted by inserting the exciting coil into the slot from the narrow gap of the tooth tip of the tooth, there is a problem that the filling efficiency of the exciting coil is low and the copper loss becomes large. As a solution to such problems,
For example, JP-A-62-118733 and JP-A-5-25
No. 2700 and Japanese Patent Laid-Open No. 6-22508, a yoke core and a teeth part are separably joined to each other to form a stator core, and the teeth part is separated from the yoke part, and then an exciting coil is wound around the winding frame part. There is proposed a stator core structure in which the teeth portion is mounted and the teeth portion is rejoined to the yoke portion.

However, since the joining surface of the iron core is almost flat, joining, welding and caulking are required to join the iron cores. At this time, the stress applied to the stator iron core and the short-circuiting between the laminated layers cause iron There is a problem that the loss characteristics are likely to deteriorate. Also,
Since the magnetic resistance greatly changes due to a slight change in the parallelism of the joint surface, it causes non-uniformity of the magnetic flux density distribution in the yoke, which further tends to deteriorate the iron loss characteristics. Further, in Japanese Unexamined Patent Publication No. 7-67272, as a joining structure of split iron cores, for example, as shown in FIGS. 4 (a) and 4 (b), butting of steel plates of opposing split iron cores at a joining portion is laminated. There is also disclosed a joining structure in which the tips of the steel plates are inserted between the steel plates that are vertically adjacent to each other so as to be performed alternately at different positions in each direction.
In this joint structure, it is necessary to insert the steel plate into a space having substantially the same thickness as that of the steel plate, which causes a problem that the positioning work is heavy. In addition, the magnetic flux density of the steel sheet adjacent to the butt portion increases, magnetic saturation easily occurs, and the effect of reducing the magnetic resistance is small, which causes non-uniformity of the magnetic flux density distribution in the yoke and reduces iron loss characteristics. There is a problem.

[0004]

SUMMARY OF THE INVENTION The present invention provides a stator core structure comprising a plurality of teeth formed by laminating steel sheets and a substantially cylindrical yoke, and rejoining by dividing the yoke portion into a plurality of portions in the circumferential direction. , The split yokes can be joined easily and stably, the parts of the steel plate adjacent to the abutting part in the stacking direction are less likely to be magnetically saturated, and the magnetic resistance reducing effect is great, and the magnetic flux density distribution in the yoke is The present invention provides a stator core structure of a rotating electric machine having a joint structure that can improve the iron loss characteristics by making it uniform.

[0005]

Means for Solving the Problems The present invention includes the following (1) to
The main point is (4). (1). In a stator core structure that consists of a plurality of teeth formed by stacking steel plates and a substantially cylindrical yoke, and divides the yoke part in the circumferential direction and rejoins it, the abutting position of the steel plates facing each other in the circumferential direction of the yoke part. Are arranged in a staggered manner in the stacking direction, and this arrangement is repeated in the stacking direction so that split yokes are formed so as to form an overlapping part between the steel plates on the sides adjacent in the stacking direction and facing each other in the circumferential direction. A stator core structure for a rotating electric machine, which is butt-joined. (2). (1) In the stator core structure of a rotating electric machine, the offset distance between the abutting tip positions of the steel plates facing each other is within a range of 1 to 10 times the steel plate thickness. (3). In (1) or (2), the stator core structure of a rotary electric machine, wherein the abutting positions of opposing steel plate tips are arranged in a sawtooth shape in the stacking direction in the cross section of the joint portion of the laminated steel plates. (4). In any one of (1) to (3), a stator core structure of a rotary electric machine, characterized in that the overlapping surfaces of steel plates that are adjacent in the stacking direction and that face each other in the circumferential direction are bonded.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a stator core structure in which a plurality of teeth formed by laminating steel sheets and a substantially cylindrical yoke are provided, and the yoke portion is divided into a plurality of portions in the circumferential direction and rejoined. The abutting positions of the steel plates facing each other in the circumferential direction of the section are arranged in a staggered manner in the laminating direction, and this arrangement is repeated in the laminating direction, between the steel plates on the side adjacent in the laminating direction and facing in the circumferential direction. It has a joining structure in which split yokes are butted and joined so as to form an overlapping portion.

In the present invention, the abutting positions of the opposing steel plates forming the split yoke are arranged in a staggered manner in the stacking direction, and the reason is that the magnetic resistance of the joint portion against the magnetic flux passing through the yoke is changed. This is for making the magnetic flux density distribution of the yoke low and stable and for facilitating the butt joint when the split yokes are assembled. The magnetic permeability of the void of the iron core is several thousandth of the magnetic permeability of the electromagnetic steel plates constituting the iron core, and it is necessary to make the void of the abutting portion as small as possible in order to reduce the magnetic resistance of the joint. In the punching and assembling steps of the iron core, it is difficult to uniformly minimize the voids in the butted portions with high accuracy. Since the permeability of the air gap is low, a slight variation in the air gap at the butted part causes a large variation in the magnetic resistance,
As a result, the magnetic flux density distribution in the yoke becomes non-uniform, and the iron loss characteristics deteriorate. By forming overlapping parts on the steel plates facing each other with the joining part sandwiched therebetween and making the steel plates in the stacking direction in surface contact, the distance between the steel plates can be minimized and made uniform, and the contact area can be increased. As a result, most of the magnetic flux passing through the joint moves to the adjacent steel plates in the laminating direction through this overlapping surface, and passes through the adjacent steel plates at the butt position, so the magnetic resistance of the joint decreases and the core punching and assembling process. It is possible to reduce the influence on the fluctuation of the magnetic resistance due to the accuracy in. In this way, the magnetic flux at the joint passes through the steel plates adjacent to the butt position,
The magnetic flux density in the adjacent steel plates increases according to the void cross-sectional area in the cross section of the joint, and the magnetic resistance increases. Further, depending on the design magnetic flux density of the yoke, magnetic saturation in the steel sheet is likely to occur when the void cross-sectional area ratio is large. In order to prevent an increase in the magnetic flux density in the steel plates adjacent to the butt joint, it is effective to reduce the void cross-sectional area ratio in the joint cross section, increasing the butt position and further increasing the butt position in the stacking direction. It is preferable to displace them at different positions. The number of steps of the stairs is preferably three or more steps, which is represented by the number of butted portions in the circumferential direction. The shift distance at each step of the butt position is 1 to the steel plate thickness.
It is preferably in the range of 10 times. If the shift distance is less than 1 time the steel plate thickness, the contact surface is insufficient and the joining is unstable, and the effect of reducing the magnetic resistance between the steel plates is not sufficient. Also, the magnetic resistance decreases as the shift distance increases, but
Even if it exceeds 0 times, the increase in the effect is small. Even when arranging the abutting positions of the opposing steel plates in a staggered manner in the laminating direction, the abutting positions of the opposing steel plates are arranged in a plurality of sawtooth shapes in the laminating direction when viewed in the cross section of the joint portion of the laminated steel plates. It is more preferable that the split yoke portions are joined more easily. When joining the split yokes where the butt joint positions of the steel plates are arranged in a sawtooth shape, the steel plate surface with the longest shift distance on the sawtooth-shaped joint surface is inserted as a guide to achieve a smooth joint. It is possible to When the split yoke portions are joined in this manner, it is effective to bond the contact surfaces of the steel sheets that overlap in the stacking direction in order to ensure the joining more reliably and stably. The joining of the joining portions of the split yoke portions by welding or the like can be omitted.

[0008]

EXAMPLE An example in which the stator structure of the present invention is applied as a stator structure of an electric motor is shown in FIGS.
A description will be given based on (b), FIG. 3 (a), and (b). Figure 1
Shows an example of the stator structure of this embodiment, and 1
Is a yoke part, which is formed by processing a large number of steel plates laminated together with a plurality of teeth parts 2 around the inner circumference of which are wound around the exciting coil 4 at equal intervals. It is divided into a plurality of pieces in the circumferential direction, and is rejoined after the exciting coil 3 is wound around the tooth portion 2. Each split yoke 1a part is a tooth part 2
The exciting coil 3 is wound around the coil and then joined in the circumferential direction so as to form the yoke portion 1. This joining portion structure, as shown in FIG. The abutting positions of the steel plates s of 1a are staggered in the stacking direction, for example, the first layer is G3, the second layer is G2,
Three butting positions such as the third layer G1, the fourth layer G1, the fifth layer G2, and the sixth layer G3 are arranged so as to be repeated in the stacking direction in units of six layers. Each butting position G1,
The distance between G2 and G3 is approximately four times the plate thickness, and the abutting positions of the cross sections of the joints are arranged in a triangular wave shape.

FIG. 3 (a) shows another arrangement example of the abutting positions of the steel plates s of the opposing split yokes 1a. In this arrangement example, the abutting positions are changed layer by layer. The third layer G3, the second layer G2, and the third layer G1 are staggered in units of three layers and are repeatedly arranged in the stacking direction.
As shown in (b), they are arranged in a sawtooth shape. The distance between the abutting positions G1, G2, G3 is four times the plate thickness, and the abutting positions of the joint cross section are arranged in a sawtooth shape. In the examples of FIGS. 3 (a) and 3 (b), the steel plate surface having the longest displacement distance, such as the A portion, as seen in the cross section of the joint, can be inserted as a guide and abutted against each other. The alignment is easier than the examples shown in a) and (b). The present invention is not limited to the above embodiment. For example, in the embodiment, although it is applied as a stator of an electric motor, other types of electric motors,
It is also applicable as a stator of a generator. The shape and structure of the teeth and the yoke, the arrangement of the abutting positions of the steel plates facing each other at the joint of the yoke, etc. may be changed within the scope of satisfying the claims depending on the type and capacity of the electric motor or generator. It is a thing.

[0010]

According to the stator structure of the present invention, the stator core structure is composed of a plurality of teeth formed by laminating steel sheets and a substantially cylindrical yoke, and the yoke portion is divided into a plurality of portions in the circumferential direction and rejoined. Since the abutting positions of the steel plates forming the split yoke are arranged in a staggered manner in the laminating direction of the steel plates, a sufficient joint surface can be formed in the butt joint, and the magnetic resistance at the joint decreases. As a result, the magnetic flux density distribution in the yoke can be made uniform and the iron loss characteristics can be improved. In addition, the influence of the gap width of the butt joint portion is reduced, and the accuracy of the butt joint processing of the split yoke can be relaxed. Furthermore, by arranging the abutting positions of the steel plates in a sawtooth shape in the stacking direction, smooth and stable joining is possible.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an example of a stator structure according to an embodiment of the present invention.

2A is an explanatory view showing an example of a joining structure of the split yoke of FIG. 1, and is a partial explanatory view of a sectional view taken along the line Aa-Ab in FIG.
FIG. 6B is an explanatory view showing an example of the arrangement shape of the abutting positions of the steel plates facing each other in the joining portion example of the split yoke portion of FIG.

3A is an explanatory view showing another example of the joining structure of the split yoke of FIG. 1, and is a partial explanatory view taken along the line Aa-Ab in FIG. 1, and FIG. 3B is a drawing of FIG. Explanatory diagram showing an example of the arrangement shape of the abutting positions of the steel plates facing each other in the example of the joint portion of the split yoke portion of FIG.

FIG. 4 is a partially cutaway front part explanatory view showing an example of a known publicly known stator structure, FIG. 4B is an explanatory view showing an example of a joining structure of split yokes in FIG. 4A, and FIG. -Ab arrow cross section partial explanatory view.

[Explanation of symbols]

1 yoke part 1a split yoke 2 teeth part 3 exciting coil 4 rotor s steel plate

Continued front page    (72) Inventor Takeaki Wakisaka             20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel shares             Company Technology Development Division F-term (reference) 5H002 AA03 AA05 AA07 AB06 AC08                       AE08

Claims (4)

[Claims] 1. A stator core structure comprising a plurality of teeth formed by laminating steel sheets and a substantially cylindrical yoke, and rejoining the yoke part by dividing the yoke part into a plurality of parts in the circumferential direction, and relative to each other in the circumferential direction of the yoke part. The butt positions of the steel plates to be placed are staggered in the stacking direction, and this arrangement is repeated in the stacking direction so that an overlapping part is formed between the steel plates on the side adjacent in the stacking direction and facing each other in the circumferential direction. A stator core structure of a rotary electric machine, characterized in that split yokes are butt-joined to each other. 2. The stator core structure of a rotary electric machine according to claim 1, wherein the offset distance between the abutting tip positions of the steel plates facing each other is within a range of 1 to 10 times the steel plate thickness. 3. The stator of a rotary electric machine according to claim 1, wherein, in the cross section of the joint portion of the laminated steel plates, the abutting positions of the opposing steel plates are arranged in a sawtooth shape in the laminating direction. Iron core structure. 4. The stator core structure for a rotary electric machine according to claim 1, wherein the overlapping surfaces of the steel plates that are adjacent in the stacking direction and are opposed to each other in the circumferential direction are bonded.