JPH01164251A - Manufacture of rotor with permanent magnet - Google Patents

Abstract

PURPOSE:To make a fixture unnecessary and the rationalization or automation of a manufacturing process easily attainable by hardening an adhesive in a state where a permanent magnet and a protecting member are provisionally fixed by an adhesive layer. CONSTITUTION:A permanent magnet 4 is provisionally fixed to a shaft 3 by an adhesive double coated tape 6, while a protecting member 7 is provisionally fixed to the outer periphery of said permanent magnet 4 by an adhesive double coated tape 9. At the same time, an anaerobic adhesive 5 which has been applied to the inner surface of the permanent magnet 4 is spread over the whole inner peripheral face of the permanent magnet 4 between said shaft 3 and said magnet 4, and air is isolated so that its hardening is started. Also, an anaerobic adhesive 8 applied to the outer peripheral face of the permanent magnet 4 is spread over the whole outer peripheral face of the permanent magnet 4 between said protecting member 7 and said magnet 4, and air is isolated so that the hardening of said adhesive is started.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing a rotor with permanent magnets having a structure in which permanent magnets are fixed to a shaft by welding.

(Prior Art) This type of rotor has a structure in which a plurality of permanent magnets are fixed to the outer periphery of the shaft, and wires or tape made of non-magnetic material are attached to the outer periphery of the permanent magnets to protect the outer periphery of the permanent magnets. It is common that a protection member is wound around the permanent magnet, and a protection ring made of a non-magnetic material is fitted thereto in order to prevent cracking or chipping at both ends of the permanent magnet in the axial direction. Conventionally, there are two methods for producing the same: one using an epoxy thermosetting adhesive, and the other using an acrylic anaerobic adhesive.

In the former case, a thermosetting adhesive is applied to the outer circumference of the shaft, a permanent magnet/stone is attached, the adhesive is heated while being held down with a jig, and the adhesive is cured, and then a protective ring is applied if necessary. are fitted to both end faces of the permanent magnet by shrink fitting etc.
Furthermore, after a protective member is wrapped around the outer periphery of the permanent magnet, a thermosetting adhesive is applied and hardened.

On the other hand, in the latter method, after applying the anaerobic adhesive in the same way, first place a permanent magnet on the outer circumferential surface of the shaft and press the permanent magnet against the shaft with a jig, thereby applying the anaerobic adhesive. By sandwiching it between the shaft and a permanent magnet and blocking it from air, it is completely cured after a predetermined period of time. Then, if necessary, fit a protective ring to both ends of the permanent magnet by shrink fitting, etc., then wrap a protective member around the outer circumference of the permanent magnet, apply an anaerobic adhesive there, and cure it. By covering it with a material, it is cured in an air-blocked state.

(Problem to be solved by the invention) However, in the conventional manufacturing method, no matter which adhesive is used, when adhering the permanent magnet, it is necessary to adhere it to the shaft to prevent the permanent magnet from shifting or peeling off. After applying the agent and attaching the permanent magnet, the permanent magnet must be held down with a jig for at least several minutes. In particular, when using a thermosetting adhesive, the time required for the heat treatment process for curing is relatively long, so a large number of jigs are required for continuous production. Moreover, when using an anaerobic adhesive to wrap and fix the protective member around the outer circumference of the permanent magnet, although it has the advantage of shortening the cycle time because the curing time is short, The disadvantage is that a special jig is required to isolate it from the air.

In other words, with conventional manufacturing methods, a large number of jigs for fixing permanent magnets must be prepared, which poses a major obstacle in streamlining or automating the manufacturing process. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for manufacturing a rotor with permanent magnets, which can eliminate the need for jigs for fixing permanent magnets, and can easily rationalize or automate the manufacturing process.

[Structure of the Invention] (Means for Solving the Problems) The method for manufacturing a rotor with permanent magnets according to the present invention provides a method for manufacturing a rotor with permanent magnets, in which a permanent magnet is interposed between a shaft and a permanent magnet, and between a permanent magnet and a protective member. The feature is that the adhesive is cured while each adhesive layer is temporarily fixed.

(Function) Since the permanent magnet is temporarily fixed to the shaft by the adhesive layer, it is only necessary to place the permanent magnet once on the shaft and press it down, and a jig for fixing the permanent magnet is not required. In addition, when the permanent magnet is temporarily fixed, the adhesive hardens while receiving sufficient compressive force from the permanent magnet due to the adhesive force of the adhesive layer.
Adhesive strength is also sufficiently increased, and of course, the permanent magnets do not shift or peel off. In addition, the protective member provided around the outer periphery of the permanent magnet is similarly temporarily fixed to the permanent magnet using an adhesive layer and then completely fixed with adhesive, so this also only needs to be wrapped around the outer periphery of the permanent magnet. This eliminates the need for temporary fixing jigs.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

First, in FIG. 1 showing a completed rotor 1 with permanent magnets together with a stator 2, reference numeral 3 denotes a shaft, which is formed in a stepped shape so that its middle portion has a maximum diameter. Reference numeral 4 denotes a plurality of permanent magnets each having a substantially arc-shaped cross section. These permanent magnets are fixed to the outer peripheral surface of the large diameter portion 3a located in the middle of the shaft 3 with a hardened anaerobic adhesive 5, and are fixed to the outer peripheral surface of the large diameter portion 3a located in the middle of the shaft 3. They are located intermittently at predetermined intervals in the direction. At both ends of the large-diameter portion 3a of the shaft 3, a double-sided live tube tape 6 corresponding to an adhesive layer is located between the shaft 3 and the permanent magnet 4, and at both ends of the large-diameter portion 3a, the double-sided adhesive tape 6 is placed. It is cut in advance so that the diameter is reduced by a dimension corresponding to the thickness (for example, several micrometers to several tens of micrometers). Reference numeral 7 denotes a tape-like or sheet-like protective member wound around the outer periphery of the permanent magnet 4, which is coated with an anaerobic adhesive 8 on the permanent magnet 4.
It is glued and fixed by. A double-sided adhesive tape 9 corresponding to an adhesive layer is attached to both ends of the permanent magnet 4 so as to be located between the permanent magnet 4 and the protective member 7 and to cover both end surfaces.

Now, the rotor 1 with permanent magnets having the above structure was manufactured as follows. First, the shaft 3 is cut into a predetermined shape and its surface is cleaned by degreasing or the like. On the other hand, as shown in FIGS. 3 and 4, double-sided adhesive tapes 6 are attached to both axial ends of the permanent magnet 4 on the inner circumference side.
At the same time, a double-sided adhesive tape 9 is attached to the outer peripheral side so as to continuously cover both ends of the outer peripheral surface and a part of both end surfaces.

Then, a required amount of anaerobic adhesives 5 and 8 (for example, acrylic adhesive) is applied to both the inner and outer surfaces of the permanent magnet 4.

After that, this permanent magnet 4 is strongly pressed against a predetermined position of the large diameter portion 3a of the shaft 3, and a fifth
Air-blocking film 1 without breathability as shown in the figure
Wind the protective part 7 with overlapping 0's. Then, permanent magnet 4
is temporarily fixed to the shaft 3 with a double-sided adhesive tape 6, and the protective member 7 is temporarily fixed to the outer periphery of the permanent magnet 4 with a double-sided adhesive tape 9. At the same time, the anaerobic adhesive 5 that had been applied to the inner surface of the permanent magnet 4 is spread over the entire inner circumferential surface of the permanent magnet 4 between it and the shaft 3, and the air is blocked and hardening begins. Moreover, the anaerobic adhesive 8 applied to the outer peripheral surface of the permanent magnet 4 is spread over the entire outer peripheral surface of the permanent magnet 4 between it and the protective member 7, and the air is blocked by the air blocking film 10. Its curing begins. When the permanent magnet 4 and the protection member 7 are temporarily fixed, the permanent magnet 4 is attracted to the large diameter portion 3a of the shaft 3 by the adhesive force of the double-sided live tube tape 6, and the anaerobic adhesive 5 is attached to the permanent magnet 4. The curing progresses under compressive force between the large-diameter portion 3a and the protective member 7, and the protective member 7 is also coated with the double-sided adhesive tape 9.
Since the anaerobic adhesive 8 is attracted to the outer circumferential surface of the permanent magnet 4, the anaerobic adhesive 8 also hardens while being subjected to compressive force. Moreover,
In particular, in this embodiment, the part of the large-diameter portion 3a corresponding to the double-sided adhesive tape 6 is cut in advance so that the diameter is reduced by an amount equivalent to the thickness of the double-sided adhesive tape 6, so that the permanent magnet 4 is It comes into closer contact with the large diameter portion 3a, and a large compressive force acts on the anaerobic adhesive 5.

If left in this state at room temperature, the anaerobic adhesive 5
, 8 are naturally cured, and are completely cured, for example, after 24 to 48 hours, and the permanent magnet 4 and the protective member 7 are completely adhesively fixed. Thereafter, the air-blocking film 10 is removed from the protective member 7, and the rotor 1 with permanent magnets is completed.

In this embodiment, the anaerobic adhesive 5.8 is cured while the permanent magnet 4 and the protective member 7 are temporarily fixed with the double-sided adhesive tape 6°9.
At the same time, it is only necessary to first press the permanent magnet 4 to a predetermined position on the shaft 3, and thereafter there is no need to fix the permanent magnet 4 or the protective member 7 with a jig. Therefore, automation of production becomes extremely easy, productivity can be greatly improved, and equipment costs can be reduced by eliminating the need for jigs. Moreover, even if the jig is not required in this way, the double-sided adhesive tape 6.9 allows the anaerobic adhesives 5 and 8 to be cured under constant compressive force.
The adhesive strength of the anaerobic adhesives 5 and 8 can be ensured sufficiently, and the reliability of the permanent magnets 4 and the retainer 7 can be improved, thereby improving quality. Moreover, especially in this embodiment, the double-sided adhesive tape 9 is attached to the outer peripheral surface of the permanent magnet 4, and a part of the double-sided adhesive tape 9 is extended to both end surfaces of the permanent magnet 4. Since the ridges located at both ends are covered, the double-sided adhesive tape 9 can prevent cracks and chips in those parts, and the protective rings conventionally fitted to both ends of the permanent magnet 4 can be prevented. You can turn it off if you don't need it. This provides the advantage that the rotational moment of inertia CDI of the rotor 1 with permanent magnets can be reduced and the characteristics of the rotary electric machine can be improved.

In the above embodiment, an anaerobic adhesive is used as the adhesive, but the present invention is not limited to this, and it is also possible to use an epoxy thermosetting adhesive, for example. Even in this case, apply the necessary thermosetting adhesive, attach the permanent magnet 4 to the shaft 3, wrap the retaining member 7 around the permanent magnet 4, and attach the permanent magnet with double-sided adhesive tape 6.9. If the entire permanent magnet 4 and the protective member 7 are temporarily fixed and heated, the adhesive on both the inner and outer sides of the permanent magnet 4 can be thermally hardened in one heat treatment process, thereby simplifying the heat treatment process. Further, when the protective member 7 is made of a transparent material, an ultraviolet curing adhesive may be used as the adhesive for adhering the protective member 7. Furthermore, even if an anaerobic curing type adhesive is used as the adhesive, the air-blocking film 10 shown in the above embodiment can be omitted if the 1-guard shrine itself has air-blocking properties. Of course it can be done. Further, the double-sided adhesive tape 6 does not necessarily need to be pasted on the permanent magnet 4, but may be pasted on the shaft 3 side, and the double-sided adhesive tape 9
It does not necessarily need to be attached to the permanent magnet 4, but may be attached to the protective member 7. In addition, although double-sided live tube tape 6.9 is used as the adhesive layer in this embodiment, the adhesive is not limited to this, and the adhesive may be applied directly to the shaft 3, permanent magnet 4, or protective member 7. You can also leave it there.

[Effects of the Invention] As described above, in the present invention, since the adhesive is cured while the permanent magnet and the protective member are temporarily fixed by the adhesive layer, a fixing jig is no longer required and manufacturing is easier. This has an excellent effect in that process rationalization or automation can be easily achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view of a rotating electric machine showing a completed state of a rotor with permanent magnets, FIG. 2 is a perspective view of the rotor with permanent magnets, and FIG. 3 is a manufacturing process. FIG. 4 is a perspective view of the permanent magnet as seen from the inner circumferential side, FIG. 4 is a perspective view of the permanent magnet as seen from the outer circumferential side, and FIG. 5 is a perspective view showing a part of the manufacturing process. In the drawing, 1 is a rotor with a permanent magnet, 3 is a shaft, 4 is a permanent magnet, 5 and 8 are anaerobic adhesives (adhesive), 6 and 9 are double-sided adhesive tape (adhesive rflI), and 7 is a protective member It is. Agent Patent Attorney Ken Nori Chika Fusuma Ken Maru Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. In manufacturing a rotor with a permanent magnet, in which a permanent magnet is fixed to a shaft with an adhesive, and a protective member is fixed with an adhesive so as to cover the outer periphery of the permanent magnet, the shaft and the permanent magnet A method for manufacturing a rotor with permanent magnets, characterized in that the adhesive is cured while the permanent magnets and the protective member are temporarily fixed by adhesive layers interposed between the permanent magnet and the protective member. .