JP3117505B2 - Rotor manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for an inner rotor type motor, and more particularly to a method for manufacturing a rotor on which a magnet is mounted.

[0002]

2. Description of the Related Art As a structure of this kind of rotor, there is one disclosed in, for example, Japanese Patent Application Laid-Open No. 2-246748.
This structure will be described with reference to FIGS. 1 and 2. A plurality of tile-shaped magnets 2 are arranged on the outer periphery of a thick cylindrical yoke 1, and a thin cylindrical can 3 is fitted on the outer periphery of the magnet 2. On the other hand, end plates 4 and 5 are mounted on both ends of the magnet 2 in the axial direction to form a rotor.

[0003] Further details will be described. York 1
Is formed by stacking a large number of punched circular thin iron plates each having a shaft hole 6, a caulking pin insertion hole 7, and a magnet positioning protrusion 8, so that these holes and protrusions are aligned in the axial direction. The main reason for using the yoke 1 as a laminate of thin iron plates is that the stator core of the motor disposed outside the rotor is formed of the laminate of thin iron plates, so that the stator core is punched and formed at the same time. This is because if the yoke 1 of the rotor is formed from a material, man-hours are not required, and the yield of the material can be favorably formed. The magnet 2 is formed of a hard magnetic material such as ferrite, but since a cylindrical one cannot be integrally formed, a plurality of tile-shaped pieces are used and arranged in a uniform manner. Ferrite and the like have drawbacks in that they are brittle in terms of mechanical strength and are difficult to machine. Further, since the magnet 2 is fixed by tightening the can 3, no adhesive or the like is required when the magnet 2 is mounted on the yoke 1.

The can 3 protects the magnet 2 from centrifugal force during rotation of the rotor. Therefore, the can 3 is required to have excellent tensile strength and to be a non-magnetic material. Generally, a stainless steel pipe such as SUS304 is used. You. As described above, it is necessary to fit the can 3 to the outer periphery of the magnet 2 to prevent the magnet 2 from being moved by being tightened. Therefore, the fitting means is a shrink fit or press fit. It will be. The end plates 4 and 5 are provided so that, when the magnet 2 is chipped by an impact such as vibration generated at the time of rotation, fragments or powder thereof are not released to the outside of the rotor. Is used. End plates 4, 5
The yoke 1 and the end plates 4 and 5 are fixed to each other by a plurality of caulking pins 9 that penetrate the inside of each of them in the laminating direction. An iron material, which is a magnetic material, is suitable for the caulking pin 9, and has a head 10 and a caulked portion 11. FIG.
Although not shown in FIG. 2, in order to smoothly assemble the rotor, actually, between the magnet 2 and the end plates 4 and 5,
A slight gap is provided between the end plates 4 and 5 and the can 3.

Next, a procedure for manufacturing the above-mentioned rotor will be described. When assembling products, a method of assembling from the inside to the outside in order is often convenient in terms of workability and the like, and is therefore established as a general method. That is, first, the yoke 1 and the end plates 4 and 5 are fixed by the caulking pins 9.
This also has the purpose of first preventing the thin iron plates constituting the yoke 1 from coming apart. Next, a plurality of magnets 2 are arranged on the outer periphery of the yoke 1 and temporarily fixed using a jig. Next, the can 3 is fitted to the outer periphery of the magnet 2 by shrink fitting or the like,
As a result, the magnet 2 is held and a rotor main body is formed. When the outer diameter accuracy of the rotor is strictly required depending on the application, the outer diameter of the can 3 is cut with reference to the shaft hole 6 to complete the rotor.

[0006]

The yoke 1 and the end plates 4, 5
Is caulked by the caulking pin 9, the thin iron plate constituting the yoke 1 is plastically deformed by the compression at the time of caulking, and the outer diameter of the yoke expands. This phenomenon is exaggerated in FIGS. As shown in the drawing, the yoke 1 is deformed particularly in the vicinity of the caulked portion 11 of the caulking pin 9, so that the bulged portion 12 bulges from the regular outer diameter indicated by the broken line. As a result, when the magnet 2 is arranged on the outer peripheral portion of the yoke 1, the inner circumferential arc of the magnet 2 does not follow the outer diameter of the yoke 1 as shown in FIG. Further, since this phenomenon is remarkable in the yoke 1 near the caulked portion 11 of the caulking pin 9, as shown in FIG. 5, rattling occurs between the magnet 2 and the yoke 1 also in the axial direction.

Due to the bulging portion 12 of the yoke 1, the outer diameter of the magnet 2 is partially increased. Therefore, when the can 3 is fitted to the outer peripheral portion of the magnet 2 by shrink fitting or the like,
The can 3 cannot be fitted, resulting in a defective product. Even when the can 3 can be fitted, the effect of the interference fit of the can 3 works only on the large-diameter portion of the magnet 2 so that partial joining is achieved. There is a concern that the cans may fall off due to idle rotation, which is a quality problem. Further, in the case where the outer diameter of the can is cut, the can idles at the time of cutting, so that the outer diameter cannot be finished, resulting in a defective product. Further, since there is a fear that the can is idle, the cutting speed (feed) cannot be increased, and the man-hour is wasted.

Although the outer diameter of the end plate 4 also swells, it can be dealt with by setting the outer diameter of the end plate 4 to a small value in advance. However, in the case of the yoke 1, laminating using thin iron plates having different outer diameters increases the mold cost and the number of steps, and a notch or the like for releasing the bulging portion 12 is provided on the outer diameter of the yoke 1. Means that the magnetic properties deteriorate,
Neither is a preferred approach.

[0009]

SUMMARY OF THE INVENTION The present invention provides a method of manufacturing a rotor constructed by integrating a yoke and an end plate by caulking pin extending through the yoke and end the plates in the stacking direction, occupying iron in the yoke In order to increase the rate, the yoke
Compressed and held in the stacking direction and fitted with a can on the outer periphery of the magnet
After that, the yoke and the end plate are caulked with a caulking pin.
It is to fix . Scan of fitting After wearing, the Ru is held in a state in which movement of each thin iron plate constituting the yoke by clamping force of the can is restricted.

[0010]

[Function] When the yoke and the end plate are swaged with a caulking pin, the pressing force of the swage acts on the yoke portion near the swaged portion. Is present, the expansion of the outer diameter of the yoke is suppressed. In this case, the pressing force applied to the yoke in the outer diameter direction presses the entire magnet in the outer diameter direction, and the magnet and the can are pressed in the outer diameter direction in a state where the magnet and the can are joined over the entire surface.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotor manufactured by the manufacturing method of the present invention has the final shape shown in FIGS. Accordingly, the structure is as described above with reference to FIGS. However, since the thin iron plates constituting the yoke 1 are easily separated from each other, it is preferable to provide a projection for caulking clamp at an appropriate place at the same time as punching of each thin iron plate, and to clamp each other.

FIG. 3 exemplifies a process of manufacturing a rotor according to the present invention and shows a state when a can is fitted. End plates 4 and 5 are arranged at both ends in the laminating direction of the yoke 1 in which the thin iron plates are aligned and stacked, and the end plates 4 and 5 are compressed in the stacking direction to reduce the gap between the thin iron plates. ing. In this case, the yoke 1 and the end plate
4 and 5 may be held at the same time. As the holding means, a pin or the like may be pressed into the yoke 1 and the shaft holes 6 of the end plates 4 and 5 to compress and hold the laminated body by pressing. At this point, since the outer diameter of the yoke 1 is in the aligned state,
When a plurality of magnets 2 are arranged, the inner circumferential arc of the magnet 2 and the outer diameter of the yoke 1 are satisfactorily joined on the entire surface. The outer diameter of the magnet 2 is maintained in a uniform state by being in close contact with the outer peripheral portion of the yoke 1. The magnet 2 is clamped and held at a part of the outer periphery thereof by a jig (not shown). When the tip of the can 3 is slightly fitted into the outer periphery of the magnet 2, the jig of the clamp is removed.

The can 3 is fitted in the direction of the arrow in FIG. 3 by shrink fitting or press fitting. In this case, since the outer diameter of the magnet 2 is uniform, it can be fitted smoothly. After the fitting, the can 3 and the magnet 2 are joined on almost the entire surface, and the pressing force due to the interference extends to the yoke 1, so that at this time, the holding means 13 and 14 of the laminate may be removed.
It is preferable to insert a pin or the like into the shaft hole 6 in order to maintain the inner diameter accuracy.

Thereafter, the caulking pins 9 are inserted into the plurality of caulking pin insertion holes 7 and caulked, and the rotor configuration shown in FIGS. 1 and 2 is completed. Caulking part 11 of caulking pin 9
Is applied to the yoke 1 in the vicinity of the caulking portion 11, but the outer periphery of the yoke 1 includes the magnet 2 and the can 3 tightly fitted to the magnet 2. The swelling of the outer diameter of 1 is suppressed to a small amount. The pressing force in the outer diameter direction applied to the yoke 1 is such that the magnet 2 is pressed hard in the outer diameter direction because the magnet 2 is hard and hardly deformed, and the magnet 2 and the can 3 are joined in a state where they are joined together over the entire surface. It will be pressed radially. As a result, the outer diameter of the can 3 on the caulking portion 11 side may slightly expand, but there is no problem because the outer diameter of the can 3 is about several percent of the wall thickness. In the case of a rotor requiring outer diameter accuracy, the outer diameter of the can 3 is finally cut with reference to the shaft hole 6 to complete the rotor. In this outer diameter cutting, can 3
Is joined to the magnet 2 over substantially the entire surface and the hug is strong, so that the can 3 does not run idle and the cutting speed can be sufficiently increased.

[0015]

According to the present invention, prior to the caulking yaw <br/> click and the end plate by caulking pin, the yoke in the lamination thickness direction
Since the can is compressed and held and the can is fitted, the outer diameter of the magnet disposed on the outer peripheral portion of the yoke is stable, so that the fitting failure of the can does not occur. In addition, since the can is joined to the magnet over substantially the entire surface and the hug is strong, the can does not come off due to the acceleration / deceleration of the rotor, so that a product of excellent quality can be manufactured. Also, as described above, since the can has a good hug, the outer diameter does not cause the can to run idle and is not defective, and the cutting speed of the outer diameter can be further increased, so that the man-hour is reduced. is there. In addition, the yoke even when the caulking fixed by caulking pin
And by holding by compressing the laminated thickness direction end plates, further
In addition, the gap between the thin iron plates is reduced, and the space factor of iron in the yoke is increased, so that an efficient motor can be configured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view showing a structural example of a rotor.

FIG. 2 is a front sectional view showing a structural example of a rotor.

FIG. 3 is a front sectional view illustrating one process of the manufacturing method of the present invention.

FIG. 4 is a plan cross-sectional view of a main part of a rotor for explaining a conventional problem.

FIG. 5 is a front half sectional view of a rotor for explaining a conventional problem.

[Explanation of symbols]

1 ... yoke, 2 ... magnet, 3 ... can, 4, 5 ... end plate, 9 ... caulking pin

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 1/27 501 H02K 1/30 H02K 15/02-15/03

Claims (1)

(57) [Claims] We claim: 1. A thin iron plate laminated to form a yoke, a magnet mounted on the outer periphery of the yoke, fitted a can on the outer periphery of the magnet, one end in the stacking direction at both ends of the yoke
With arranging the plate, in the method of manufacturing a rotor constructed by integrating the yoke and the end plates by caulking pin which penetrates the yoke and end the plates in laminated thickness direction, the yo
And held to compress over click to laminated thickness direction prior to the outer peripheral portion of the magnet
After fitting the can , the yoke and the end plate are
Method of manufacturing a rotor and performing by Tsu Heck tighten fixing the caulking pin.