JPH0687636B2 - Method of manufacturing permanent magnet rotor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of a permanent magnet rotor having a plurality of permanent magnets on the outer peripheral surface of a cylindrical yoke fixed to a rotary shaft or on the outer peripheral surface of the rotary shaft. It is a thing.

2. Description of the Related Art In the rotor of this type of rotating electric machine, the permanent magnet and the yoke are firmly connected to each other in order to prevent the permanent magnet from falling off due to centrifugal force, and the magnetic gap between the permanent magnet and the stator is not increased by this connecting device. Need to

Therefore, in general, the permanent magnets arranged on the outer peripheral surface of the yoke are wound while applying tension with a semi-cured resin impregnated tape (for example, a glass cloth tape or a carbon cloth tape that is semi-cured by impregnating an epoxy resin). Further, in order to prevent the permanent magnet from being displaced in the circumferential direction, a resin is filled in the axial groove at the outer peripheral boundary portion of the permanent magnet, and then this is heat-cured and fixed. An example of the conventional method for manufacturing the above-mentioned permanent magnet rotor will be described below.

5 and 6 show the structure of a conventional permanent magnet type rotor, and FIG. 7 shows an arched permanent magnet. In FIGS. 5 and 6, reference numeral 1 is an arc-shaped permanent magnet, and 2 is a yoke, which is press-fitted into the rotary shaft 3. 4 is a side plate press-fitted on both sides of the yoke 2, 4a is a resin injection hole formed in the side plate 4,
Is a resin injected and filled from the resin injection hole 4a, and 6 is a semi-cured resin impregnated tape.

In the above-mentioned structure, first, the arc-shaped permanent magnets 1 are evenly arranged in the circumferential direction on the outer peripheral portion of the yoke 2 press-fitted into the rotating shaft 3, and a plurality of them are arranged side by side with an adhesive. Stick to it.

Next, the outer peripheral portion of the arc-shaped permanent magnet 1 and the outer peripheral portions of the side plates 4 on both sides are spirally wound with the semi-cured resin impregnated tape 6 as shown in FIG. At this time, the semi-cured resin-impregnated tape 6 needs to be wound with a minimum gap and without overlapping. This is because in the former case, the resin 5 leaks to the rotor surface if the gap is large, and in the latter case, the magnetic gap between the resin 5 and the stator is small.
This is to prevent rotation failure due to contact.

After winding in a spiral shape with the semi-cured resin-impregnated tape 6, the winding end portion is processed (not shown), and then the side plate 4 is formed.
The resin 5 is injected and filled through the resin injection holes 4a, and the resin injection holes 4a on both sides are plugged.

Put the whole rotor in the drying furnace in this condition,
Heat for about the time. By this heating, the resin 5 filled in the semi-cured resin impregnated tape 6 and the axial groove portion of the outer peripheral boundary of the arcuate permanent magnet 1 is hardened, and the arcuate permanent magnet 1 is firmly fixed.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the manufacturing method as described above, the resin leaks from the gap between the semi-cured resin-impregnated tape spirally wound around the arc-shaped permanent magnet and the outer peripheral portion of the side plate during heat curing. Often attached to the outer periphery of the side plate or the outer periphery of the wound tape, it was necessary to remove these by cutting or sanding after curing. A lot of time is spent to remove the attached resin, which is a great obstacle in manufacturing.

The present invention eliminates the above-mentioned conventional drawbacks, and aims to simplify the manufacturing process of a permanent magnet rotor and improve productivity.

Means for Solving the Problems In order to solve the above problems, the method for manufacturing a permanent magnet rotor according to the present invention comprises: It is characterized in that taping is performed by using an adhesive tape having an appropriate dimensional width so as to cover the outer peripheral portion and the axial groove of the outer peripheral boundary portion of the arcuate permanent magnet.

The manufacturing method of the permanent magnet type rotor of the present invention is easy by taping with an adhesive tape having an appropriate width so as to cover the outer peripheral portions of both side plates and the axial groove of the outer peripheral boundary portion of the arcuate permanent magnet. It is possible to prevent the resin from flowing out. As a result, the number of manufacturing steps can be saved and the productivity can be improved.

Examples Hereinafter, with respect to the manufacturing method of the permanent magnet rotor of the present invention,
A description will be given with reference to the drawings.

1 and 2 show the structure of a permanent magnet rotor according to the manufacturing method of the present invention.

In FIGS. 1 and 2, 11 is a bow-shaped permanent magnet, and 12 is a yoke, which is press-fitted into the rotary shaft 13. 14 is a side plate press-fitted to both ends of the yoke 12, 14a is a resin injection hole provided in the side plate 14, 15 is a resin injected and filled from the resin injection hole 14a, and 16 is taping so that the resin 15 does not leak out. Adhesive tape 17 is a semi-cured resin impregnated tape.

A method for manufacturing a permanent magnet rotor having the above-described structure will be described.

As described in the conventional example, first, the arc-shaped permanent magnet 11 is rotated
The yoke 12 is press-fitted into the yoke 12 and is evenly arranged in the circumferential direction on the outer peripheral portion of the yoke 12. Further, a plurality of rows are arranged side by side and fixed with an adhesive.

Next, in order to prevent the resin 15 from flowing out, as shown in FIG. 3 and FIG. 4, taping with an adhesive tape 16 is performed so as to cover the outer peripheral portions of the side plates 14 on both sides and the axial groove of the outer peripheral boundary portion of the arcuate permanent magnet 11. I do. In the figure, the dimensions of the tape layer are exaggerated for the sake of clarity. Then, the outer circumferences of the side plates 14 on both sides, the outer circumference of the arc-shaped permanent magnet 11 and the outer circumference of the adhesive tape 16 are spirally wound with a semi-cured resin impregnated tape 17 having an appropriate width to perform a winding end treatment. At this time, the semi-cured resin impregnated tape 17 is an adhesive tape as a measure for preventing the resin 15 from flowing out.
Since tape is applied at 15, it is not necessary to wind the tape with high precision to reduce the gap between the tapes as in the past. Next, the resin 15 is injected and filled from the resin injection hole 14a of the side plate 14 by an injection pump. At this time, it is possible that the adhesive tape 15 peels off due to the injection pressure of the injection pump,
The adhesive tape 15 cannot be peeled off because the outer periphery of the adhesive tape 15 is wound by the semi-cured resin impregnated tape 17 so as to press it while applying tension.

After the resin 15 is filled, the resin injection holes 14a on both sides are plugged, and in this state, the entire rotor is put in a drying furnace and heated at about 150 ° C. for about 2 hours.

After curing by heating, the rotor is taken out of the drying oven and the plug of the resin injection hole is removed to complete the work.

EFFECTS OF THE INVENTION As is clear from the above description, according to the present invention, before the outer periphery of the arc-shaped permanent magnet is wound with the semi-cured resin-impregnated tape, the adhesive tape is used to form the outer peripheral portions of both side plates and the arc-shaped permanent magnet. By taping so as to cover the axial groove of the outer peripheral boundary, it is possible to prevent the resin from flowing out to the outer surface of the rotor, simplify the manufacturing process, and improve the productivity. .

In addition, the adhesive tape is inexpensive and has a thin thickness of 0.1 to 0.2 mm, and there is no problem in product characteristics. Also, since crepe paper is generally used as the support of the adhesive tape, heat curing of the semi-cured resin impregnated tape is performed. It has the function of absorbing the resin sag at the time and making the resin layer on the rotor surface uniform, and can easily secure a magnetic air gap with the stator, which is also effective in terms of quality and its practical effect is great. There is something.

[Brief description of drawings]

FIG. 1 is a sectional view of a permanent magnet rotor of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIGS. 3 and 4 are manufacturing processes of the permanent magnet rotor of the present invention. FIG. 5 is a plan view and a side view showing a state of being sealed with an adhesive tape in FIG. 5, FIG. 5 is a sectional view of a conventional permanent magnet rotor, and FIG. 6 is a sectional view taken along the line AA of FIG. FIG. 8 is a perspective view of an arc-shaped permanent magnet, and FIG. 8 is a perspective view showing a state in which a semi-cured resin-impregnated tape is spirally wound in the manufacturing process of the permanent magnet rotor. 11 …… Bow-shaped permanent magnet, 12 …… Yoke, 13 …… Rotation axis, 14
…… Side plate, 14a …… Resin injection hole, 15 …… Resin, 16 …… Adhesive tape, 17 …… Semi-cured resin impregnated tape.

Claims (1)

[Claims] 1. A plurality of bow-shaped permanent magnets are arranged on the outer peripheral surface of a rotary shaft or a yoke, and non-magnetic side plates having resin injection holes are fitted to both ends of the bow-shaped permanent magnet in the axial direction, Adhesive tape having an appropriate width is attached so as to cover the outer circumferential portion of the side plate and the axial groove at the outer circumferential boundary portion of the arcuate permanent magnet, and the semi-cured resin impregnated tape is wound around the outer periphery of the side plate and the arcuate permanent magnet. A method for manufacturing a permanent magnet rotor, which is rotated and is filled with resin from a resin injection hole provided in the side plate into a groove of the arcuate permanent magnet and fixed by heating.