JPS58201565A - Stator for rotary electric machine - Google Patents

Abstract

PURPOSE:To facilitate the winding work of a stator for rotary electric machine by providing projections for guiding a coil on an insulator, thereby simplifying the mechanism of a winding machine. CONSTITUTION:An insulator 11 is interposed between a stator core 1 and a coil, and formed of an outer wall 11a which covers the outer peripheral surface 1a of a core 1, an end face 11b which covers the yoke 5 of the core 1, a radial part 11c which covers the toothed part of the core 1 and the inner peripheral wall 11d which covers the inner peripheral surface 1b of the slot of the core 1. Further, a projection 12 for guiding the coil of small shape is formed integrally with the radial part 11c and the end of the inner wall 11d of the insulator 11. Electric wires which are contacted with the end of the insulator 11 are introduced into the slot along the crest-shaped projection 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator for a rotating electric machine in which a toroidal winding is applied to a yoke portion of each slot of an annular stator core.

In recent years, as electric motors have become smaller and lighter, there has been a strong demand for thinner products.Toroidal winding is applied to the yoke of each slot in the stator core, which constitutes the main part of the electric motor. Electric motors that promote thinning of electric motors, reduce material consumption, and increase efficiency are attracting attention.

In this electric motor, in order to apply a toroidal winding to the yoke portion of the annular stator core, the purpose can be achieved without using a toroidal winding machine by dividing the core in the radial direction. In this case, the winding method is to rotate the divided iron core or to rotate the entire flyer divided iron core around the yoke part and wind the winding wire. Generally, the latter method is often adopted due to the simplicity of the device. The present invention also improves the drawbacks of the latter winding method and provides significant effects.

FIG. 1 is an example of a flyer winding.

In the figure, a split core 1 to be wound is held by a chuck 2 of a winding machine. The electric wire 3 is wound around the vertical iron part 6 by the flyer 4 rotating around the yoke part 6 of the split iron core 1, thereby forming a winding 6. At this time, the yoke part 6
It is necessary to swing the split core 1 by an angle θ about the center of the opening 7ai of all the slots 7 so that the wire is wound uniformly over the entire area of one slot. In this way, the winding 6 is wound uniformly over the entire yoke part of the slot 7, but in this method, (1) the center of swing of the iron core 1 is aligned with the center of the iron core 1; Since this is different, two drive centers are required in the winding machine, making the mechanism complicated and expensive.

(2) Since the center of swing of the iron core 1 is located at the opening of the slot 7, which is a very limited area, if the center of swing of the iron core 1 deviates even slightly, the heavy wire 3 wound by the flyer 4 will move to the slot opening 7a.
It comes into contact with the core tooth section 8 facing the outside, causing wire breakage, damage to the insulation coating, etc.

(@ In order to reduce the deflection due to the winding of the electric wire 3, it is necessary to apply more tension than necessary, and in the case of a thin wire, the VFR wire has poor overall winding properties.

This method has the following fatal drawbacks and is difficult to adopt for grand prize production.

FIG. 2 shows another example of winding by the flyer 4. In the figure, the point that the split core 1 is held by the chuck 2 is the same as in the previous example. A fixed wire guide 9 and an oT@wire guide 1o are set in contact with the inner diameter surface of the iron core 1 so as to cover the tips of the teeth with a gap Tb necessary for the wire #j13 to pass through.

The fryer 4 rotates as in the previous example and connects the electric wire 3 to the yoke part 6.
In order to achieve uniformity, the flyer 4 is oscillated by an angle α about the center of the iron core 1, or the flyer 4 is oscillated back and forth by the width of the slot 111' in a straight line.

According to this method, it is possible to perform winding with much more stable quality than the above-mentioned winding method without a wire guide. However, with this method, it is impossible to place a fixed object that is directly connected to the winding machine base in the space surrounded by the locus created by the winding of the flyer 4 and the electric wire 3, and therefore it is necessary to place it in the space. The other wire guide must be integrally fixed to the core 1 on the inner diameter surface of the core. As a movable wire guide, the tab must be moved as the iron core 1 rotates each time one slot of winding is completed. This is undesirable because it requires extremely complicated movements for automatic operation of the winding machine and requires time to drive the winding machine.

The present invention aims to correct the above-mentioned drawbacks of the conventional example, and to obtain a stator winding that can rationally scale the winding and has stable quality.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 3 shows the structure of the insulator 11 interposed between the stator core 1 and the winding 6, including an outer wall portion 11a that covers the outer peripheral surface 1a of the core 1, and an end surface that covers the vertical iron portion 6 of the core 1. The part 11b, the radial part 110 that covers the tooth part 8 of the core 1, the inner wall part 11d that covers the slot inner circumferential surface 1b of the core 1, and the other part have a shape with one end open for insertion from both end surfaces of the core 1. It is integrally formed of an electrically insulating plastic resin such as polyester or polyacetal, and is attached closely to the iron core 1.

Further, the tips of the radial portion 11a and the inner wall portion 11d of the insulator 11 extend to the same position as the end surface of the tooth portion 8, that is, the inner diameter surface of the core, and protrude in the axial direction near the tip of the radial portion 110. A winding guide protrusion 12 having a small shape when viewed in the radial direction of the iron core 1 is integrally formed. Note that the insulator 11
Since the radial portion 110 is formed to cover the tip of the core tooth portion 8, when it is attached to the core 1, only the inner diameter surface of the core is exposed. Also,
The tip of the radial portion 11a may be formed to protrude slightly inward from the tip of the tooth portion 8.

FIG. 4 is a diagram showing the winding state in the embodiment of the present invention,
As shown in FIG. 6, the iron core 1 is insulated by inserting molded insulators 11 from both end faces, and is held by a chuck 2. The flyer 4 rotates around the vertical iron part 5 of the iron core 1, and the electric wire 3
wind it.

At this time, the iron core 1 is swung by an angle β within a range in which the locus of the electric wire 3 wound around the center between the iron core center O and the slot opening 7a does not exceed the center of the tip of the teeth on both sides of the slot 7. , whereby the electric wire 3 is evenly wound around the vertical iron part 6. If we consider the state in which the iron core 1 is fully swung in either direction as shown in FIG. The fryer 4 hits the vicinity of the tip of the chevron-shaped protrusion 12 provided at the tip of the insulator 11, and as the fryer 4 rotates from ■→■→◎, it slides on the peripheral edge of the tip of the insulator and falls into the slot. That is, the chevron-shaped protrusion 12 of the insulator 11 serves as a wire guide.

By making the molded insulator 11 covering the iron core 1 protrude outward in the track direction from the end face of the inner diameter side tip of the part that covers the teeth 8 as in this embodiment, it is possible to prevent the molded insulator 11 from being in close contact with the inner diameter surface of the core. The movable wire guide 1o, which was fixed to the inner diameter surface of the toothed portion of the core so as to move together with the fixed wire guide 9 and the core 1, becomes unnecessary. Therefore, since the fixed wire guide 9 is insecure, the mechanism of the winding machine is simplified, and the effort of moving the movable wire guide 10i1 slot every time the winding is completed is eliminated, thereby simplifying the winding work. On the other hand, the side surfaces of the core teeth on both sides of the slot opening are covered with a molded insulator 11 having a smooth chamfered surface, so that the electric wire 1IiI3 is connected to the core 1.
There is no need to worry about l1fr dust or damage to the film caused by contact with. Furthermore, since a wire guide function is added to the molded insulator 11, there is no need to limit the swing of the iron core 1, which is the body to be wound, to a small, limited range of the slot opening 7a. It can be anywhere on the line from the center to the center of the inner diameter of the core, and especially when the center of the inner diameter of the core and the center of swing are aligned, the centers of the two drive systems of the index mechanism and swing mechanism of core 1 are the same. The winding machine can be greatly simplified.

Note that in the insulator 11 shown in FIG. 3, the protrusion 12 has a plate-like shape when viewed from a direction perpendicular to the inner circumferential surface of the tooth slot, but when viewed from a direction perpendicular to the inner circumferential surface of the tooth slot as shown in FIG. The effect of the present invention is the same even when the protrusion 12 has a substantially triangular shape when viewed from the direction.

In addition, all the diagrams used in the explanation show that the wire sliding part of the molded insulator 11 has a corner, but this is just to help you understand the diagrams more quickly.In reality, the wire sliding part has a curved surface. Needless to say, it needs to be chamfered at an obtuse angle and be smooth.

Further, the iron core 1 with the winding 6 is molded,
Configure the stator.

As is clear from the above description, according to the present invention, since the winding guide protrusion is provided on the insulator, there is no need for a special fixed wire guide or movable wire guide as in the past, and the mechanism of the winding machine is improved. This simplifies the process, eliminates the need to move the movable wire guide, and simplifies the winding work. In addition, it has excellent effects when applying toroidal windings, such as being able to completely alleviate restrictions on swinging the iron core.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a toroidal winding without using a conventional wire guide, Fig. 2 is an explanatory diagram of a toroidal winding using a conventional wire guide, and Fig. 3 is an explanatory diagram of a toroidal winding using a conventional wire guide. A perspective view showing how the insulator according to the present invention is attached to the iron core, FIG. 4 is an explanatory diagram of a toroidal winding when the same insulator is used, and FIG. FIG. 6 is a perspective view showing a winding state for explaining the wire guide function of the protrusion, and FIG. 6 is a perspective view of a main part showing another embodiment of the insulator of the present invention. 1... Iron core, 1a... Iron core outer peripheral surface, 1
b...Slot inner peripheral surface, 5...Yoke part, 6...Winding, 7...Slot, 8...
...Teeth, 11.Old...Insulator, 11a...
...Outer wall part, 11b...End face part, 11a...
...Radial part, 11d...Inner wall part, 12...
····protrusion. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure '1'I 2rIII Figure 3 2 288- Figure 4 Figure 5 Figure 6 = 289

Claims (4)

[Claims] (1) At the tip of the teeth of an insulator that covers the outer peripheral surface of the stator core, the inner peripheral surface of the slot, and the end surface of the core, which has a plurality of teeth protruding inward from the annular yoke and the yoke, A fixing for a rotating electric machine that is formed by integrally providing a winding guide protrusion that protrudes in the axial direction, and winding a winding in each slot of a stator core covered with an insulator so as to be approximately orthogonal to the yoke. Child. (2) The rotary electric machine stator according to claim 1, wherein the insulator is molded from an electrically insulating resin and has one end open so that it can be inserted from both end faces of the iron core. (3) The winding guide protrusion formed on the insulator is
A rotating electrical machine stator according to claim 1, which is formed into a mountain shape. (4) The rotary electric machine stator according to claim 3, wherein the protrusion is formed into a plate shape when viewed from a direction perpendicular to the inner circumferential surface of the tooth slot. (5) The rotary electric machine stator according to claim 3, wherein the protrusion is formed in a substantially triangular shape when viewed from a direction perpendicular to the inner circumferential surface of the tooth slot.