JPS58212336A - Stator core for rotary electric machine - Google Patents

Abstract

PURPOSE:To enable to simply form a toroidal coil at a high speed without a winding machine by forming the outer periphery of a split core in a non-circular shape so that the outer diameter of the splitting direction is larger than that in a perpendicular direction to the split surface and forming a recess in the vicinity of the split surface of the outer periphery. CONSTITUTION:When split cores 4, 4' are bonded, the bore forms a true circle at O as a center, the outer peripheries draw a half circle of radius R at points P, P' which are isolated at an interval A at both sides from the center O as centers, and both half circles are smoothly coupled via linear line in a long circle at the position perpendicular to the split surface 5. A recess 6 is formed in the vicinity of the split surface, a projection 7 which is thus produced at the split surface side is formed to have a slope to the flat split surface 5 so that the width C of the root is made larger than the width B of the end. In this manner, toroidal coil can be simply formed at a high speed, thereby reducing the magnetic reluctance at the bonding time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator for a rotating electric machine in which so-called toroidal windings are applied to the yoke portions of a part or all of the slots of an annular core having slots, and in particular to This relates to a split core in which the core is divided into two along a plane including the diameter in order to operate without using a toroidal winding machine.

The windings of a motor stator are generally formed by inserting pre-wound wires into slots provided inside an annular core, with both ends thereof protruding outward in the axial direction from the end face of the core. However, in this method, a coil end portion that is large compared to the core thickness is generated, resulting in a motor that is long in the axial direction in relation to the motor output. If we create a so-called toroidal winding in which all the windings are directly wound around the yoke of each slot of the iron core, the height of the coil end can be greatly shortened, and the height of the coil end can be reduced by a wide range.
---... It is possible to obtain an electric motor.

Normally, a toroidal winding machine is required to apply toroidal winding to a ring-shaped body to be wound. This wire winding machine sets the wire storage ring so as to intersect with the annular body to be wound, then winds the required wire in one turn around the wire storage ring, then reverses the wire storage ring and stores the wire. The wire is wound on the body to be wound while exposing the wire, but the workability is extremely poor and the winding speed is slow, so it is suitable for winding rotating electric machines such as electric motors, which requires multiple windings. is not suitable.

As an alternative to the toroidal winding machine, it has been proposed in Japanese Patent Application No. 51-980 CM, etc. to divide the core, which is the body to be wound, and apply flyer winding to each slot of each divided core. ing.

This method is useful because, except for joining the split cores, toroidal winding, which has been difficult and rare in the past, can be done easily and at high speed.

However, various problems arise when joining these iron cores. First of all, as shown in Fig. 1, the concave and convex portion 2 is provided at the joint of the split cores 1 and 1' (Japanese Patent Application Laid-Open No. 58-2123).
36(2) This is the method of meshing the two parts, but this always requires a gap in order for the two to mesh, and this gap becomes magnetic resistance and affects the motor characteristics. Furthermore, there are important problems such as variations in quality unless attention is paid to the control of the dimensional accuracy of both.

The next possible method is to provide a protrusion 3 on the outside of the split surface, as shown in FIGS. 2 and 3, and to join the tip portion 3a of this portion by welding, etc., and to make the split surface flat. However, although this method solves the above-mentioned problems to some extent, the protrusions 3 provided on the outside of the split surface prevent the iron core from being handled as an annular body during transportation after clamping, which requires some ingenuity. .

Further, the same problem can be considered with respect to transportation after the winding is completed, and another problem arises in that the presence of the protrusion 3 becomes an obstacle when an automatic supply, transportation, handling, and assembly line is provided. There is also a quality problem in that the protrusion 3 comes into contact with another winding and damages that winding.

In addition, when manufacturing the core, the shape of the punching die is complicated, and it is expensive and requires time and effort to maintain.

6-1 The present invention has been made to improve these points.

A plan view of an embodiment of the present invention is shown in FIG. 4, and a perspective view is shown in FIG. In FIG. 4, the split cores 4 and 4' are made so that when joined together, the inner diameter forms a perfect circle with the center at 0. At this time, the outer circumference is A on both sides from the center o.
A semicircle with a radius R is drawn centering on points p and p' which are separated by the same distance, and an ellipse is formed by smoothly connecting both semicircles with a straight line at a position perpendicular to the dividing plane 5. Therefore, the width of the yoke is Y near the dividing surface compared to X in the direction perpendicular to the dividing surface 6.
+ A, and is configured approximately as wide as A.

Further, a recess 6 is formed in the vicinity of the dividing surface, so that a convex portion 7 formed on the dividing surface side has a width C at its base larger than a width B at its tip, as shown in FIG. 7 to 12 show other embodiments of the present invention.
In FIG. 7, the outer peripheral shape of the core is changed from the oval shape as shown in FIG. 4 to an elliptical shape.

That is, from the inner diameter center 0 of the iron core to the outside in the direction perpendicular to the dividing plane,
When the distance to the circumference is R2 and the distance from the center to the outer circumference of the dividing surface is R', and R'-R=2, the outer circumferential shape of the core is equidistant A from the center O to both sides in the dividing direction. It is formed by connecting a circular arc whose radius is [(R+2)-, A) centered at points p and p''6 and a circular arc whose radius is R centered at 0 with a tangent line or smoothly connected with a circular arc.

In FIGS. 8 and 9, the recess 6 formed near the dividing surface is semicircular or U-shaped.

Furthermore, FIG. 10 shows a groove in a direction perpendicular to the dividing surface at the base of the protrusion 7 formed by providing the recess 6, and FIG. A groove is provided on the wall surface on the side far from the surface, and further, in FIG. 12, a stepped portion is provided on the wall surface forming the recess 6.

Note that since the present invention is for an electric motor with toroidal winding, if the value of Y with respect to X is set larger than necessary,
The length of the winding in that part becomes longer, resulting in an increase in the amount of copper, which cancels out the advantages of the toroidal winding. Therefore, it is important to keep the difference between Y and X, that is, A, to the minimum necessary.

By shaping the split core as described above, the following effects are produced.

1. Toroidal winding can be performed without using a toroidal winding machine.

2. Increase in magnetic resistance during split surface bonding can be reduced by increasing the area of the split part.

3. Since there are no unnecessary protrusions on the outer periphery of the core, it can be handled as an annular core.

4.Using the recessed part, chucking positioning can be performed during automatic transportation, handling, etc.

5. Since there are no protrusions on the outer periphery, it will not damage other windings after winding is completed.

6. Compared to those with protrusions on the outer periphery, the shape of the core punching die is simple, the force υ, the die and the cost are low, and repairs can be easily performed.

7. By providing the welding part for clamping inside the recess, it is possible to prevent core deformation due to welding distortion and the weld bead from rising to the outer periphery, making welding clamping easier.

8. Temporary bonding can be performed with simple parts by using the recesses on both sides of the split surface, improving workability for winding, etc.

9. When winding the wire, using the protrusions on the dividing surface to chuck the wire into the winding machine allows for a stronger and more stable chuck.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example of joining a conventional split core, Fig. 2 is an explanatory diagram showing another example of conventional joining, Fig. 3 is a perspective view of the iron core shown in Fig. FIG. 6 is an enlarged plan view of the divided portion of FIG. 4, and FIG. 7 is a plan view of the iron core according to another embodiment of the invention. 8th plan view showing the outer circumferential shape of the
Figures 1 to 12 are partial plan views of the dividing portion in other embodiments of the present invention. □) 4. 4' ・−・−・Split core, 5゛・・・・・・
Dividing surface, 6...concave portion, 7...convex portion. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 7 Figure 8 Figure 9 Figure 1θ Figure 11

Claims (5)

[Claims] (1) An annular core with teeth is divided into two along a plane that includes the diameter, and the outer periphery of this core is made into a non-circular shape in which the outer diameter of the divided core in the dividing direction is larger than the outer diameter of the divided core in the direction perpendicular to the dividing surface. The stator core of rotating electric machines is made of (2) A stator core for a rotating electric machine according to claim 1, wherein a recess is provided in the vicinity of a dividing surface on the outer periphery of the core. (3) A stator core for a rotating electrical machine according to claim 2, wherein the distance from the core inner diameter center to the bottom of the recess is greater than or equal to the radius in the direction perpendicular to the dividing surface. (4) When the outer periphery of the iron core is defined as R', the distance from the inner diameter center 0 of the core to the outer periphery perpendicular to the dividing surface is R9, the distance from the center O to the outer periphery of the dividing surface is R', and R'-R=Z. , the outer peripheral shape of the iron core is equidistant A from the center O to both sides in the dividing direction.
[(R+2)-A
] A stator core for a rotating electric machine according to claim 1, which is formed by connecting a circular arc with a radius of ] and a circular arc with a center of O and a radius of R with a tangent or smoothly connected with a circular arc. (5) A stator core for a rotating electrical machine according to claim 4, wherein z=A.