JPH0937492A - Stacked core and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stacked core equal in overall thickness and at low cost by stacking each lamination plate consisting of a salient pole where a coil is wound and a plurality of core plates on top of one another while rotating it for a fixed angle at a time. SOLUTION: A stacked core 3 has a base 1a being a regular hexagonal pillar, and a salient pole 1b extends outward from the section of each face. The salient pole 1b is provided with an umbrella part 1f positioned at the tip and an arm 1g connecting it with the base 1g, and a coil where the number of phases is three is wound. The stacked core 3 is made by stacking three laminations 2 being obtained by stacking core plates consisting of isotropic or anisotropic electromagnetic steel plates, while rotating them 120 deg. at a time. Hereby, it is made possible to equalize it extending over the whole even if there is a bias in the thickness or magnetic property, and it can be used without minding the orientation, so the manufacture cost can be kept down low.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated core structure applicable to motors and the like.

[0002]

2. Description of the Related Art A laminated core widely used in motors and the like is shown in FIG. In FIG. 4, the laminated core is formed by laminating a plurality of core plates. The laminated core has a base portion 11a that is a regular hexagonal prism, and salient poles 11b extend outward from the respective surface portions of the base portion 11a. The salient pole 11b is composed of an umbrella portion 11f located at the tip and an arm portion 11g connecting the umbrella portion 11f and the base portion 11a. A coil is wound around the arm portion 11f of the salient pole 11b.

[0003]

Since the core plate used in the above laminated core is formed by punching an electromagnetic steel plate into an appropriate shape, the core plate does not have a flat shape as a whole, but has a partial thickness. Bias is occurring. When an isotropic electromagnetic steel plate is punched out using the same device, the part where the thickness of the core plate is deviated is always the same part. Therefore, when such core plates are laminated to form a laminated core, it is shown in FIG. As described above, the unevenness grows and becomes large, and the thickness of the laminated core cannot be made uniform.

As a method for making the thickness of the laminated core uniform,
As described in Japanese Patent Application Laid-Open No. 4-265642, there is a method of stacking core plates while rotating them by a predetermined angle, that is, a method of transposing. When the laminated core is formed by transposition, the portion where the thickness of the core plate is deviated can be arranged not at one place but at the whole, so that the laminated core having an entirely flat thickness can be obtained. However, transposing the core plates one by one is very time-consuming, and
Since the manufacturing time becomes long, the cost rises.

The present invention has been made to solve the problems of the prior art as described above, and has a uniform overall thickness,
Moreover, it is an object to provide a low-cost laminated core and a manufacturing method thereof.

[0006]

According to the first aspect of the present invention,
A salient pole around which a coil is wound, a laminated core including a plurality of core plates, and a laminated core obtained by stacking the laminated bodies,
Each of the stacked bodies is characterized in that they are rotated by a predetermined angle and stacked.

According to a second aspect of the present invention, the number of phases of the coil is m, the number of salient poles is an integer multiple of m, the number P of laminated bodies is an integer multiple of m and is an integer of 2 or more, and each laminated body is substantially It is characterized in that it is composed of the same number of core plates, and when n is an integer of 1 or more, the respective laminated bodies are superposed by rotating by (360 ° / P) · n.

The invention according to claim 3 includes at least a step of stacking core plates to obtain a plurality of stacked bodies, and a step of rotating and stacking each stacked body by a predetermined angle. To do.

A plurality of core plates are laminated to form a plurality of laminated bodies, and each laminated body is stacked while being rotated by a predetermined angle, so that the laminated core has a uniform thickness as a whole. To be laminated.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a laminated core and a method of manufacturing the same according to the present invention will be described below with reference to the drawings. 1 and 2, the laminated core 3 is configured by laminating a plurality of core plates made of isotropic electromagnetic steel plates. The laminated core 3 is a base 1a which is a regular hexagonal prism.
The salient poles 1b extend outward from the respective surface portions of the base portion 1a. The salient pole 1b includes an umbrella portion 1f located at the tip and an arm portion 1g connecting the umbrella portion 1f and the base portion 1a.
It is composed of Such a salient pole 11b arm 1
For example, a coil having a phase number of 3 is wound around 1f.

As shown in FIGS. 2 and 3, the laminated core 3 is formed by stacking three laminated bodies 2 obtained by laminating core plates made of an isotropic electromagnetic steel sheet or an anisotropic electromagnetic steel sheet. It is formed by Since the three laminated bodies 2 are formed by laminating the same number of core plates having the same thickness, the thickness dimensions L1, L2, and L3 are equal.

In the case of stacking the respective laminated bodies 2, first, the first laminated body 2 is arranged at the lowermost side, and the second laminated body 2 is placed on the first laminated body 2 1 for 1 stack 2
It is rotated 20 degrees and stacked. Next, the third laminated body 2 is stacked on the second laminated body 2 by rotating 120 ° with respect to the second laminated body 2 (240 ° with respect to the first laminated body 2). It By thus stacking the laminated bodies 2 by 120 ° and overlapping each other, the portions where the thickness of the laminated body 2 is uneven can be evenly distributed in the circumferential direction, so that the laminated core 3 The thickness can be made uniform throughout.
Furthermore, by stacking the laminated bodies 2 by 120 ° so as to overlap each other, even if the core plates constituting the laminated body 2 are made of isotropic electromagnetic steel sheets, the directionality of the core plates is uniformly dispersed. Therefore, it can be used without worrying about the directionality. Further, instead of rotating and stacking the core plates one by one, a plurality of the core plates are stacked to form the laminated body 2, and the laminated body 2 is stacked while rotating to form the laminated core 3. The cost can be kept low.

In order to eliminate unevenness in the thickness of the laminated core 3 to be formed and to make it uniform overall, the number of all laminated bodies is P (where P is an integer of 2 or more), and each laminated body is laminated. Basically, it is preferable that the rotation angle of the body 2 in the overlapping state is 360 ° / P. The laminated core 3 shown in FIGS. 1 to 3 has three phases, six salient poles 1b and six laminated bodies 2, that is, P is 3, so 360 ° / 3 = 120 ° and rotation The angle is 120 °.

If P is 6 under the condition that the number of phases is 3 and the number of salient poles 1b is 3, 360 ° / 6.
= 60 ° and the rotation angle becomes 60 °. However, in this case, the opening angle of the two salient poles 1b is 120 °, and the rotation angle is smaller than the opening angle.
The positions of will not match up and down. Therefore, when the calculated rotation angle is smaller than the opening angle of the two salient poles 1b, the calculated angle (60 °) is multiplied by an integer to set the rotation angle to 120 ° which is equal to the opening angle of the two salient poles 1b. do it. By stacking the six laminated bodies 2 while rotating them by 120 °, 120 ° × 6 (number of laminated bodies 2) =
This is 720 °, which means that the uppermost laminated body 2 has been rotated twice with respect to the lowermost laminated body 2.

Further, even when there is no restriction on the opening angle of the salient pole 1b, the rotation angle can be arbitrarily set by applying the formula of (360 ° / P) · n. For example, salient pole 1
When laminating the laminated cores 3 in which the number of b is 6, the number P of laminated bodies is 6, and the laminated body 3 is 0 ° in order from the bottom laminated body.
You may pile up while rotating, such as 120 degrees, 240 degrees, 0 degrees, 120 degrees, and 240 degrees.

Therefore, from the above, the rotation angle of each laminated body 2 is such that the number of coil phases is m, the number of salient poles 1b is an integral multiple of m, and the number of laminated bodies 2 is an integral multiple of m. When P is an integer of 2 or more, if the rotation angle of each laminated body 2 is (360 ° / P) · n (n is an integer of 1 or more), the concentration of bias is eliminated at a specific location. Thus, the laminated core 3 having a uniform thickness can be formed.

In the above embodiment, the number of core plates constituting each laminated body 2 is the same, but the number of core plates laminated between the laminated bodies 2 is exactly the same. There is no need to do so, and there may be some variation as long as the number is the same. For example, in FIG. 2, the thickness dimension is L
The core plate that constitutes the laminated body 2 of No. 1 and the core plate that constitutes the laminated body 2 of which the thickness dimension is L3 are different from each other due to the variation in the thickness of each core plate. L
There may be a difference between 3 and. In this case, the thickness of each laminated body 2 can be made substantially uniform by adjusting the number of core plates. Since there is no problem in terms of performance of each laminated body 2 as long as the thickness dimension is substantially constant, the number of laminated core plates does not have to be exactly the same, and even if there is a slight increase or decrease in the number. I don't care.

[0018]

According to the present invention, a laminated core having a salient pole around which a coil is wound and a laminated body made up of a plurality of core plates, and a laminated core obtained by stacking the laminated bodies has a fixed thickness. Since they are rotated by each angle and stacked, it is possible to arrange the locations where the thickness of the laminated body is unevenly distributed evenly in the circumferential direction, and it is possible to make the laminated core uniform in thickness. Become. In addition, since each laminated body is rotated by a fixed angle and stacked, even if the core plate is made of an isotropic electromagnetic steel plate, the directionality of the core plate can be uniformly dispersed, and The same characteristics as when using electromagnetic steel sheets are obtained. Further, the number of phases of the coil is m, the number of salient poles is an integer multiple of m, and the number P of laminated bodies is an integral multiple of m. Each laminated body is formed by laminating approximately the same number of core plates, and n
Is an integer of 1 or more, the rotation angle of each laminate is (3
Since it is set to 60 ° / P) · n, uneven portions of each laminated body are evenly arranged, and a laminated core having a uniform thickness as a whole can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a laminated core according to the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is an exploded perspective view of the same.

FIG. 4 is a plan view showing an example of a conventional laminated core.

FIG. 5 is a cross-sectional view showing an enlarged main part of the above laminated core.

[Explanation of symbols]

 1b salient pole 2 laminated body 3 laminated core

Claims (3)

[Claims] 1. A laminated core having a salient pole around which a coil is wound and obtained by stacking a laminated body composed of a plurality of core plates, wherein each laminated body is rotated by a predetermined angle. A laminated core characterized by being stacked. 2. When the number of phases of the coil is m, the number of salient poles is an integral multiple of m, and the number of laminated bodies is P (where P is 2).
The above integer) is an integer multiple of m, and each laminate is formed by laminating approximately the same number of core plates. When n is an integer of 1 or more, each laminate is (360 ° / P). The laminated core according to claim 1, wherein the laminated core is rotated by n and stacked. 3. A method of manufacturing a laminated core comprising at least the following steps, a step of laminating core plates to obtain a plurality of laminated bodies, and rotating each laminated body by a predetermined angle. The process of stacking.