JPH051966Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a method of forming a rotationally symmetrical shape by stacking a plurality of plate materials provided with teeth at a constant pitch with the teeth shifted by a half pitch. The invention relates to a laminated structure object.

[Prior Art] An example of such a laminated structure object is a rotor of a pulse motor.

A rotor of a pulse motor using a laminated structure object (hereinafter referred to as a laminated structure type rotor) is made by stacking a specified number of plates, such as silicon steel plates, to form a rotationally symmetrical shape. This silicon steel plate is manufactured by press working.

Silicon steel sheets manufactured by press working have variations in thickness in the plane direction, particularly in the direction orthogonal to the rolling roll direction. Further, the magnetic properties are different in the rolling roll direction and the direction perpendicular thereto (such properties are referred to as magnetic anisotropy).

In a laminated rotor, dislocation is performed during the manufacturing process so that the finished rotor does not vary in thickness depending on position or exhibit magnetic anisotropy.

Here, dislocation means rotating the silicon steel plates by a certain angle and stacking them. For example, if the number of dislocations is 4, as shown in Figure 7, the silicon steel plate has
Positioning holes a ₁ to _{a 4} are formed at every 90°, and a notch b indicating a reference position (0° position) is formed.

Then, as shown in FIG. 8, one set is made up of 1/4 of the specified number of sheets, and each set is shifted by 1/4 turn to align the hole positions. This compensates for variations in the thickness of the steel sheet and magnetic anisotropy,
The finished rotor will be uniform. In the case of Figure 8, the prescribed number of sheets is 72 and the number of sheets in one set is 18.

Here, the number of teeth of the rotor is an integral multiple of the number of dislocations. This is because the hole position and tooth tip position must be rotationally symmetrical with respect to dislocation.

[Problems to be solved by the invention] A rotor for a pulse motor requires magnetic vectors that are 180 degrees out of phase with each other in order to rotate the motor. For this reason, in a rotor for a pulse motor, when the positioning holes are aligned and overlapped, the teeth c must be shifted by half a pitch, as shown in FIG. For this reason, two types of press molds had to be made, resulting in a problem of increased processing costs.

The present invention was made in order to solve the above-mentioned problems, and the purpose is to provide a laminated structure object that can be stacked with one type of press-shaped plate material with the teeth shifted by half a pitch and has a low processing cost. shall be.

[Means for Solving the Problems] The present invention provides a laminated structure in which a plurality of plate materials provided with teeth at a constant pitch are stacked with the teeth shifted by a half pitch to form a rotationally symmetrical shape. In the object, the plate material is provided with a mark at a position shifted by 1/4 pitch from the central axis of the tooth, and the plate material facing up and the plate material turned inside out are stacked with the marks aligned. It is a laminated structure object characterized by:

[Example] The present invention will be explained below with reference to the drawings.

FIG. 1 is a diagram showing the main part of an embodiment of the present invention, showing the positional relationship between the teeth of the pulse motor and the alignment holes. The figure shows the arrangement of the teeth in a developed view.

In FIG. 1, d is a positioning hole, and four such holes are formed on the circumference of the rotor core so as to be rotationally symmetrical with a phase difference of 90°.

The relationship between hole d and tooth c is shown in Figure 1. The hole d is formed at a position offset by 1/4 pitch from the central axis O-O' of the groove. In the figure, P is the pitch of tooth c. At this time, the number of teeth is naturally an integral multiple of 4.

If four silicon steel plates as shown in Figure 1 are stacked one on top of the other, each shifted by 90 degrees based on the alignment holes, then
The four silicon steel plates compensate for thickness variations and magnetic anisotropy.

Another set of four laminated steel plates like this is O-
If we invert it using the O' axis as the axis of symmetry, we get something like Figure 2.

If you combine a four-layered steel plate as shown in Figure 1 and a four-layered steel plate as shown in Figure 2 with their holes d aligned,
The tooth arrangement is as shown in Figure 3. In Figure 3, a total of eight steel plates are used to correct the thickness and magnetic anisotropy, and to shift the teeth by half a pitch. This idea is
This fact is used to stack steel plates.

Here, a method of stacking silicon steel plates will be explained.

A case where the transposition is performed four times will be explained. In this case, the specified number of sheets is set to 8n (n is an integer).

First, make 8 sets of n steel plates stacked without shifting, and use 4 of them to make a laminated iron core rotated 4 times. That is, as shown in FIG. 4, the first set of n sheets _D1 remains as is, and the second set _D2 is rotated 90° to the left with respect to the first set. Similarly, the third
The second group rotates 180° to the left relative to the first group, the fourth group D ₄
is rotated 270° to the left with respect to the first set.
When four sets of iron cores rotated in this way are stacked with their holes aligned, a 4n layer with corrected plate thickness and magnetic anisotropy is created.
A laminated iron core consisting of two steel plates is created.

The remaining n sheets of four sets _D5 to _D8 are also laminated in the same manner. When this laminated iron core is inverted with the O-O' axis as the axis of symmetry and stacked with the four sets D ₁ to D ₄ described above, the plate thickness and magnetic anisotropy are corrected, and the teeth are shifted by half a pitch to form 8n. The rotor core is assembled from two steel plates.
This is shown in FIG.

In addition, in the example, a case was explained in which a hole was used as a mark for positioning the steel plate, but the mark for positioning is not limited to a hole, but also a keyway, a half-open hole as shown in Fig. 6, etc. It may be hot.

Further, the number of dislocations is not limited to four, but may be any number that can correct the difference in thickness and magnetic anisotropy of the silicon steel plate. The number of dislocations does not have to be the same as the number of holes d.

Furthermore, the laminated structure object according to the present invention may be applied not only to a rotor of a pulse motor but also to a structure in which teeth are assembled by shifting the teeth by half a pitch, such as a stator of a motor.

Further, the silicon steel plate is not limited to one that has been press-formed, but may be one that has been processed by wire cutting.

[Effects] According to the present invention, the plates are provided with alignment marks at positions 1/4 pitch off from the center of the teeth, so if the plates are turned over and stacked with the holes aligned, the teeth will be aligned. You can stack them by shifting them a half pitch. This allows the teeth to be shifted by half a pitch even if one type of plate material is used, which reduces processing costs. Further, since it is not necessary to overlap two types of plate materials, the finished laminated structure object has good dimensional accuracy.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the main parts of an embodiment of the present invention, Figure 2
The figure is an inverted view of the silicon steel plate in Figure 1, Figure 3 is an overlapping view of the steel plates in Figures 1 and 2, Figures 4 and 5 are illustrations of the lamination work of the present invention, FIG. 6 is a diagram showing another example of positioning marks on silicon steel plates, and FIGS. 7 to 9 are diagrams showing how to stack conventional examples of laminated structure objects. c...teeth, d...mark.

Claims (1)

[Claims for Utility Model Registration] A laminated structure object formed by stacking a plurality of plates provided with teeth at a constant pitch with the teeth shifted by half a pitch to form a rotationally symmetrical shape, wherein the plates is a laminated structure characterized in that a mark is provided at a position offset by 1/4 pitch from the central axis of the tooth, and a sheet material facing up and a sheet material turned inside out are overlapped with the marks aligned. object.