JPS6364556A - Manufacture of rotor with permanent magnet - Google Patents

Abstract

PURPOSE:To facilitate positioning, by forming elongated protrusions on the outside circumferential surface of a laminated iron core, with which permanent magnets are arranged as reference, and then by pressing down both ends of a permanent magnet with iron core plates with pressing down section. CONSTITUTION:Equipped with a shaft inserting hole 11a at its centre, an iron core plate 11 to comprise a laminated iron core 10 forms four projections 12 at the edge of the outside circumference and that forms eight permeative holes 13 in its inside. Multiple iron core plates are laminated, which forms elongated protrusions 14 by projections 12 of each iron core plate 11 and through holes 15 by permeative holes 13. Four permanent magnets 16 are contacted to the outside circumference of this iron core 10. This permanent magnet 16 has the same height and size as the laminated thickness of a laminated iron core 10 and is of such a form as will be inserted into between the elongated protrusions 14 of the iron core 10, and is stuck to each protrusion 14 as its reference. Thus the permanent magnet 16 is in the controlled state against circumferential movement by the projected stripe section 14 and is assuredly prevented from the deviated movement of the permanent magnet 16.

Description

[Detailed Description of the Invention] [Statement of the Invention] (Industrial Application Field) The present invention provides a structure in which a permanent magnet is arranged around the outer periphery of a laminated iron core, and a reinforcing rj is fitted onto the permanent magnet. This invention relates to a method of manufacturing a rotary r- with a permanent magnet, which is integrated by die-casting.

(Prior Art) Conventionally, rotors with permanent magnets constituting brushless morphs and synchronous motors have generally had a +14 configuration in which permanent magnets are fixed to the outer periphery of an iron core with an adhesive. However, in recent years, as the speed of this type of motor has increased significantly, peeling and scattering of the permanent magnets due to centrifugal force has become a problem. In order to deal with this, a configuration as shown in FIG. 6 is also provided. In the figure, reference numeral 1 denotes a laminated core in which a large number of circular core plates are laminated, and on the outer periphery of this core, for example, four permanent magnets 2 are solidified with adhesive, and then a reinforcing tube 3 is attached by shrink fitting or the like. It is fitted. After fitting the reinforcing tube 3, it is set in a mold (not shown) and die-casting is performed using, for example, aluminum, and the through hole 1a formed in the laminated core 1 is solidified with aluminum passing through it. be integrated. According to the 1°/5 configuration, the fixing strength of the permanent magnet 2 is greatly increased by the reinforcing cylinder 3 and the solidified aluminum, and the permanent magnet 2 is prevented from peeling off and scattering even during high-speed rotation.

(Problem to be solved by the invention) However, in the above configuration, the permanent magnet 2 is connected to the laminated iron core 1.
Be careful using a special jig when gluing it in place! There is a problem with work 1- that positioning must be performed at R. In addition, when the reinforcing tube 3 is fitted, the bonded permanent magnet 2 is subjected to a strong force that causes it to shift due to the h17 reinforced tube 3, and when die-casting, it also shifts due to the pressure of the molten aluminum. A strong force acts that moves you. Therefore, in order to withstand these forces, it is necessary to use a fairly strong adhesive, and even if a strong adhesive is used, the permanent magnet 2 may occasionally shift. Therefore, there is a risk of reducing the reliability of hardening.

Therefore, one object of the present invention is to manufacture a rotor with permanent magnets that can easily position the permanent magnets around the outer periphery of a laminated core, simplify manufacturing work, and reliably prevent the permanent magnets from shifting. We are here to provide you with a method.

[Structure of the Invention] (Means for Solving the Problems) The 3G manufacturing method of a rotor with permanent magnets according to the present invention is such that a protrusion of the number of pulls is provided on the outer periphery of an iron core plate, and the protrusion is used to form a laminated iron core. The movement in the circumferential direction is restricted by arranging permanent magnets between the protrusions formed on the outer periphery of IL. The axial movement of the permanent magnet is restricted by placing it on the laminated iron core so as to be located at the outer periphery of the permanent magnet, and then the reinforcing tube is fitted around the outer periphery of the permanent magnet and die casting is performed. It has the following characteristics.

(Function) The movement of the permanent magnet in the circumferential direction is regulated by the protrusions formed on the outer periphery of the laminated core, and the movement in the axial direction is controlled by the holding parts of the core plates that are nestled at both ends of the laminated core. Regulated.

Since the movement of the permanent magnet is restricted in both the circumferential direction and the axial direction in this manner, it is possible to reliably prevent the permanent magnet from shifting when the reinforcing tube is fitted or die-cast.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

As shown in FIG. 2, the iron core plate 11 for forming the laminated iron core 10 has a substantially circular shape with a shaft insertion hole 11a in the center, and four protrusions 12 on the outer periphery at 90 degrees. The holes 13 are formed at equal angular intervals, and a total of eight through holes 13 are formed at equal angular intervals of 45 degrees inside the holes. Such iron core plate I
First, a laminated core 10 is constructed by laminating a large number of X's until they reach a predetermined size. In this state, as shown in FIG. 1, the protrusions 12 of each core plate 11 are connected in series to form four protrusions 14 on the outer peripheral surface of the laminated core 11.
Through hole 1 extending in the axial direction by through hole 13 of each iron core plate 11
5 is formed. Thereafter, four permanent magnets 16 are bonded to the outer periphery of the laminated iron core 10.

The permanent magnet 16 has the same height as the laminated thickness of the laminated core 10, and has a shape that fits between the protrusions 14 of the laminated core 10, with each protrusion 14 being 1! As a standard, it is bonded to the laminated core 10 while being placed between the protrusions 14. As a result, the movement of the permanent magnet 16 in the circumferential direction is restricted by the protrusion 14. After this, the two core plates 11 are attached to the other core plates 11 at both ends of the product iA core 10.
They are arranged 45 degrees apart from each other. In this state, the protrusions 12 of each core plate 11 are formed at angular intervals of 90'', so the protrusions 12 of the core plates 11 at both ends overlap the protrusions 14° 14 of the laminated cores 10 that have already been laminated. The projections 12 of the iron core plate 11 at both ends are positioned in the middle of the permanent magnet 16 in the glaze direction.
It functions as a holding part that restricts the movement of 6 in the axial direction. Furthermore, since the through holes 13 of the core plate 11 are formed at angular intervals of 45°, the through holes 13 of the core plate 11 at both ends coincide with the through holes 15 of the laminated core 10 that have already been laminated. Both ends of the product j·A core 10 are brought into communication through the μ through holes 15. The configuration at this stage is shown in FIG. still,
In the figure, 17 is a temporary shaft press-fitted into the shaft hole 11a of the laminated core 10.

After forming +13 in this way, a reinforcing cylinder 18 formed of a non-magnetic material or a magnetic material is shrink-fitted to the outer periphery of the permanent magnet 16,
Attach by cold sealing or gluing.

When reinforcing the reinforcing tube 18 in this way, the reinforcing tube 18 is rubbed against the permanent magnet 16, so the permanent magnet 16 receives a force that causes it to shift mainly in the axial direction.
Since the end faces of each permanent magnet 16 are in contact with the projections 12 of the core plates 11 located at both ends of the laminated core 10, the permanent magnets 16 are reliably prevented from moving in the axial direction. After fitting the reinforcing tube 18, the laminated core 1 is placed in a mold 19 as shown in FIG.
0 is stored and the mold is closed, for example, molten aluminum is injected into the cavity 19b from the sprue 19a and die casting is performed. During this die casting, a strong force acts to move the permanent magnets 16 in the circumferential and axial directions due to the pressure of the press-fitted molten aluminum. Board 1
Since the axial movement is regulated by the first protrusion 12 and the circumferential movement is regulated by the protrusion 14, displacement of the permanent magnet 16 is reliably prevented. The molten aluminum flows into both end faces of the laminated core 10 through the through holes 15 of the laminated core 10, and after being cooled and solidified, it is taken out from the mold 19 to obtain a rotor with permanent magnets as shown in FIG.

In this way, according to the above embodiment, when adhering the permanent magnet 16 to the laminated core 10, the work can be done using the protrusions 14 of the laminated core 10 as a base, so no positioning jig is required. This makes the work extremely simple. Also,
Since displacement of the permanent magnet 16 is reliably prevented, sufficient adhesion strength can be ensured without using a particularly strong type of adhesive for bonding the permanent magnet 16 to the laminated core 10. Can be done.

In the above embodiment, the core plates 11 disposed at both ends of the laminated core 10 have the same shape as the other core plates 11 so that the protrusions 12 of each core plate 11 can also be used as holding parts. The invention is not limited to this, and the core plates disposed at both ends of the laminated core may have a different shape from other core plates, for example, may have a large number of dedicated holding parts, or may simply have a diameter larger than other core plates. It is also possible to form a flange-like presser portion around the entire circumference.

[Effects of the Invention] The present invention has the following features. As mentioned above, a protrusion is formed on the outer IN surface of the laminated iron core, a permanent magnet is placed around this protrusion, and then both ends of the permanent magnet are held down by an iron core plate having a holding part. Therefore, the permanent magnet can be easily positioned, and the permanent magnet can be prevented from moving, thereby increasing the fixing strength of the permanent magnet.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention; Figure 1 is an exploded perspective view, Figure 2 is a view of the core plate, and Figure 3 is a plan view of the reinforcing tube before it is fitted. , FIG. 4 is a sectional view showing the mold together with a mold during die casting, FIG. 5 is a sectional view of a completed rotor with permanent magnets, and FIG. 6 is a view equivalent to FIG. 1 showing a conventional example. In the drawing, 10 is a laminated core, 11 is a core plate, 12 is a protrusion, 13 is a through hole, 14 is a protrusion, 16 is a permanent magnet, and 18 is a ? +Ii strong and simple, 19 is a mold. Out! I) 11 people Stock Accounting Toshiba Ma 2z Figure 4 Figure 5

Claims (1)

[Claims] 1. A plurality of permanent magnets are arranged around the outer periphery of a laminated iron core constructed by laminating a large number of iron core plates, and after fitting a reinforcing tube to the outer periphery of these permanent magnets, these are integrated by die casting, Circumferential movement is achieved by intermittently providing a plurality of protrusions on the outer peripheral edge of the iron core plate and arranging the permanent magnet between a plurality of protrusions formed on the outer circumferential surface of the laminated core by the protrusions. The axial movement of the permanent magnet is regulated by placing an iron core plate having a presser portion on the outer periphery on the laminated iron core so as to be located at both ends of the permanent magnet, and then the above-mentioned A method for manufacturing a rotor with permanent magnets, characterized in that die casting is performed by fitting the reinforcing cylinder around the outer periphery of the permanent magnet.