JP2721902B2 - Method of manufacturing permanent magnet rotor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a rotor used in a PM (permanent magnet) type stepping motor or the like, and more particularly, to a cylindrical interposed member fixed to the outside of a rotor shaft. The present invention relates to a method for manufacturing a permanent magnet rotor in which a plurality of ring-shaped permanent magnets are inserted and bonded with a collar member for positioning in the axial direction interposed therebetween.

[Related Art] As a permanent magnet rotor for a stepping motor, there is a permanent magnet rotor in which two ring-shaped permanent magnets are arranged side by side. In the prior art, as shown in FIG. 5, an intervening member 12 made of a metal material is fixed to a rotor shaft 10, and ring-shaped permanent magnets 14a and 14b are inserted at predetermined intervals on both sides thereof and bonded. doing.

In this case, the outer diameter of the intervening member 12 and the inner diameter of the permanent magnets 14a and 14b are matched to achieve coaxiality. Also permanent magnet
In order to perform axial positioning between 14a and 14b,
Has a structure with a flange 12a or a step as shown in FIG. Therefore, the interposition member 12 performs all functions of fixing the permanent magnets 14a and 14b, positioning in the radial direction, and positioning in the axial direction.

[Problems to be Solved by the Invention] As described above, in the prior art, the axial position where the ring-shaped permanent magnet is to be bonded is determined by the flange or the step formed on the interposition member 12, so that the height of the ring-shaped permanent magnet is increased. Intervening members must be created according to the dimensions and the spacing between the permanent magnets. Further, since the position in the radial direction is determined by the outer diameter of the interposed member and the inner diameter of the permanent magnet, both must be manufactured with sufficiently high precision.

For these reasons, there has been a disadvantage that the shape of the intervening member is complicated and the production is complicated. There is also a disadvantage that various types of intervening members must be prepared according to the motor.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art, to increase the coaxiality between the rotor shaft and the permanent magnet, and to increase the axial direction despite the use of a simple-shaped intervening member. An object of the present invention is to provide a method of manufacturing a permanent magnet rotor capable of improving positioning accuracy.

Means for Solving the Problems According to the present invention, which can achieve the above object, a cylinder fixed to the outside of the rotor shaft using a bonding jig having a shaft positioning insertion hole and a permanent magnet outer diameter positioning accommodating portion. The interposed member is housed in the bonding jig, and a plurality of ring-shaped permanent magnets are
This is a method for manufacturing a permanent magnet rotor that is inserted into the bonding jig via a collar member for axial positioning and bonded to an intervening member.

Here, the collar member is made of a synthetic resin or a metal material, and may have an O-ring shape or a C-ring shape. In particular, when the C-ring is formed, the collar member can be easily removed after the permanent magnet and the intervening member are bonded.

[Operation] By inserting the rotor shaft into the shaft positioning insertion hole and inserting the permanent magnet and the collar member into the outer diameter positioning accommodating portion of the permanent magnet, the permanent magnet and the rotor shaft become the outer diameter of the permanent magnet and the rotor shaft. Positioning is performed as a reference, and both are assembled with extremely good coaxiality. Further, since the interval (position in the axial direction) between the permanent magnets is determined by the collar member, it is not necessary to provide a step, a flange or the like in the intervening member, and a simple cylindrical shape may be used. Moreover, since the outer diameter of the intervening member does not become a reference, high dimensional accuracy is not required. For this reason, the production of the intervening member becomes extremely easy. Further, by simply changing the height of the collar member, it is possible to easily cope with the case where the height of the permanent magnet changes or the interval changes.

In particular, if a collar member having a C-ring shape is used, it can be easily removed after the permanent magnet and the intervening member are bonded, which is preferable in terms of reducing the weight of the rotor. Depending on the material and shape used, the collar member can be used repeatedly, which is advantageous in terms of cost.

Of course, the collar member can be freely incorporated in the rotor as it is.

FIG. 1 is an explanatory view showing the method of the present invention, and FIG. 2 is an assembled perspective view of a permanent magnet rotor. In the present invention, the first
As shown in the figure, an adhesive jig 24 having a shaft positioning insertion hole 20 and a permanent magnet outer diameter positioning housing 22 is used. The shaft positioning insertion hole 20 is set to a size in which the rotor shaft 26 just fits, and the outer diameter positioning accommodating portion 22 of the permanent magnet has a concave portion corresponding to the outer diameter of the ring-shaped permanent magnets 28a, 28b to be used. ing.

The rotor shaft 26 is attached to the cylindrical interposed member 30 by press fitting, driving, bonding, or the like. The intervening member 30 is made of iron, aluminum, or the like, and has an outer peripheral surface having a straight shape with no steps or flanges. The outer peripheral surface may be a smooth surface,
It is desirable to perform knurling.

An adhesive is applied to the outer peripheral surface of the intervening member 30,
30 and the rotor shaft 26 are integrated into the bonding jig 24,
The rotor shaft 26 is set so as to be inserted into the positioning insertion hole 20 of the shaft. A ring-shaped permanent magnet 28a, a collar member 32, and a second ring-shaped permanent magnet 28b are sequentially inserted into the cylindrical gap defined by the bonding jig 24 and the intervening member 30 from above.

In this embodiment, the collar member 32 has a C-ring shape,
It is made of synthetic resin or metal. Thus, the interposition member 30 and the permanent magnets 28a and 28b are bonded in the bonding jig.

When the bonding is almost completed, it is removed from the bonding jig 24.
Then, the C-shaped collar member 32 is removed. In this way, a permanent magnet rotor as shown in FIG. 3 is obtained. Therefore, in this case, the adhesive is applied only to the portions where the permanent magnets on both sides of the interposition member 30 are located.

Removing the collar member 32 is preferable in that the weight can be reduced and the inertia can be reduced. Also color member 32
Can be used repeatedly by considering its structure and material. As the collar member, in addition to the C-ring shape, a configuration in which two semi-cylindrical members are combined may be used.

As shown in FIG. 4, an O-ring shaped collar member 34 is provided.
May be. In this case, an adhesive is applied to the entire outer peripheral surface of the intervening member 30, and the collar member 34 is also adhered to the intervening member 30. The collar member 34 may have the same outer diameter as the ring-shaped permanent magnets 28a, 28b, but preferably has a slightly smaller outer diameter.

In addition, in the case of the embodiment shown in FIG. 4, it is not necessary to remove the collar members 34 one by one, so that the manufacturing is further facilitated.

In any case, in the present invention, the center of the bonding jig 24 is positioned by inserting the rotor shaft 26 into the positioning insertion hole 20 of the shaft, and the permanent magnets 28a and 28b By inserting into the bonding jig
Positioning is performed on 24. That is, the rotor shaft 26 and the permanent magnets 28a and 28b can be assembled with good coaxiality with reference to the outer diameter of the rotor shaft 26 and the permanent magnets 28a and 28b.
Therefore, it is not necessary to improve the dimensional accuracy of the inner peripheral surface of the permanent magnet and the outer peripheral surface of the interposed member.

[Effect of the Invention] The present invention is a method of bonding and assembling a plurality of ring-shaped permanent magnets using a straight interposition member using the above-described bonding jig. It can be assembled with high coaxiality with reference to the rotor shaft.

Further, in the present invention, since the positioning in the axial direction is performed using the collar member, the intervening member may have a straight cylindrical shape, and there is no need to form a flange portion or a step as in the related art, so that it is inexpensive and easy. Even if the height dimension, interval, etc. of the permanent magnets to be incorporated differ due to the increase in the types of rotors, it is possible to immediately respond by simply changing the collar member.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of the method of the present invention, FIG. 2 is an assembled view of a permanent magnet rotor, FIG. 3 is a perspective view showing an example of a permanent magnet rotor obtained thereby, and FIG. FIG. 5 is a perspective view showing another example of the permanent magnet rotor obtained by the present invention, and FIG. 5 is an explanatory view showing an example of the prior art. 20: Shaft positioning insertion hole, 22: Permanent magnet outer diameter positioning accommodating part, 24: Bonding jig, 26: Rotor shaft, 28a, 28
b: permanent magnet, 30: interposed member, 32, 34: color member.

Claims (3)

(57) [Claims] An adhesive jig having a shaft positioning insertion hole and an outer diameter positioning accommodating portion for a permanent magnet; a rotor shaft and a cylindrical interposed member fixed to the outside thereof are housed in the adhesive jig;
A method for manufacturing a permanent magnet rotor, wherein a plurality of ring-shaped permanent magnets are inserted into the bonding jig via a collar member for positioning in the axial direction and bonded to an intervening member. 2. The method according to claim 1, wherein the collar member has a C-ring shape, and after the permanent magnet and the intervening member are bonded, the collar member is removed. 3. The method according to claim 1, wherein the collar member has an O-ring shape, and the collar member is also adhered to the intervening member.