JPH01174263A - Manufacture of magnetic structural member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method of manufacturing a magnetic structural member, and more particularly, to a method of manufacturing a magnetic structural member, and more particularly, to a method of producing a magnetic structural member, and more particularly, a method of producing a magnetic structural member with a fine pitch, which is suitable for use as a field for a linear actuator, for example. The present invention relates to a method of manufacturing a magnetic structural member.

[Conventional technology]

The permanent magnet of the conventionally proposed linear actuator is simply N
The pole and the S pole are alternately magnetized along the moving direction of the mover.

[Problem that the invention seeks to solve]

However, as described below, the above-mentioned conventional technology does not give sufficient consideration to the magnetization of the permanent magnet, and there is room for improvement, particularly in terms of fine pitch magnetization.

Before discussing the problems of the prior art, we will explain the need for magnetization of the permanent magnet used for the field of the linear actuator, that is, the necessity of magnetization with a minute pitch. A permanent magnet used for a field of a linear step actuator is illustrated.

Fig. 12 shows the principle diagram of the actuator, that is, Fig. 12 shows the principle diagram of the actuator.
FIG. 2 is an explanatory diagram of a main part configuration of a (on) type linear pulse motor.

In FIG. 12, magnetic pole pieces are provided in a stator A-phase magnetic pole 2 and a stator B-phase magnetic pole 3, each of which is wound with coils 4 and 5, respectively. The movable element 6 is provided with a permanent magnet 1 which is alternately magnetized with small N poles and small S poles at the same pitch as the stator magnetic pole teeth. The stator A-phase magnetic pole 2 has magnetic pole parts 21 and 22, and the phase relationship between the two magnetic pole parts 21 and 22 is as follows.
When the teeth of the mover correspond to the N pole of the permanent magnet 1, the magnetic pole part 2
The second tooth is configured to coincide with the S pole of the permanent magnet 1. Therefore, in this case, the magnetic flux Φ^ interlinks the coil 4, as shown in FIG. The stator B-phase magnetic pole 3 also has magnetic pole parts 31 and 32, and these two magnetic pole parts 31 and 32 also have the same phase relationship as the stator A-phase magnetic pole 2. Furthermore, stator A phase magnetic pole 2 and stator B phase magnetic pole 3
The phase relationship between stator A-phase magnetic pole 2 and permanent magnet 1 is such that when the teeth of stator A-phase magnetic pole 2 coincide with the minute magnetic pole of permanent magnet 1, the center of the tooth of stator B-phase magnetic pole 3 coincides with the minute magnetic pole switching point of mover permanent magnet 1. We have such a relationship. Therefore, when the permanent magnet 1 is located at the position shown in FIG. 12, the magnetic flux Φ^ interlinks with the coil 4, but the magnetic flux does not interlink with the coil 5. On the other hand, when the mover 6 moves and the minute magnetic pole polarity of the mover permanent magnet 1 facing the teeth of the magnetic pole portions 21 and 22 of the stator A-phase magnetic pole 2 is reversed, the magnetic flux interlinking with the coil 4 is in the opposite direction to Φ＾. Further, when the stator A-phase magnetic pole 2 and the permanent magnet 1 are located at the same relative positions as the stator B-phase magnetic pole 3 and the mover permanent magnet 1 in FIG. 12, the magnetic flux does not interlink with the coil 4.

In this way, the direction and magnitude of the magnetic flux linkage of the coil 4 change depending on the position of the movable element 6. Similarly, in the coil 5 on the stator B-phase magnetic pole 3 side, the interlinkage magnetic flux changes depending on the position of the movable element 6, and its phase is shifted by 90' in electrical angle with respect to the coil 4.

In addition, although the said description illustrated the case of two phases, it is the same also when the number of phases is three or more, and in that case, only the phase difference of each phase differs according to the number of phases.

Therefore, the thrust of the actuator as described above is
It is proportional to the amount of change in the interlinkage magnetic flux of the stator coils 4 and 5 with respect to the change in position of the stator coils 4 and 5. Therefore, in order to fully exhibit the high thrust characteristic of a linear step actuator, the pitch of the steps, that is, the pitch of the teeth of the stator A-phase magnetic pole 2 and the stator B-phase magnetic pole 3, and the magnetic pole pitch of the mover permanent magnet 1 are required. It is necessary to miniaturize the magnetic flux linkage of the stator coils 4 and 5 with respect to a change in the position of the movable element 6. Minimizing the magnetic pole pitch of the movable permanent magnet 1 is necessary to increase the high thrust of the linear step actuator. This is an indispensable technology for

However, conventionally, the permanent magnet 1 provided in the mover 6 is
As shown in the figure, the N and S poles are simply magnetized alternately.According to this, when the magnetization pitch is made minute in order to increase the motor thrust, the following A problem arises.

FIGS. 13 and 14 are basic conceptual diagrams when magnetizing the magnetized surface of the permanent magnet material 7 using the conventional magnetizing device 1°.

Thus, in FIG. 13, the magnetizing device 1o performs magnetization by making the area of the tip 9 of the core 8 facing the permanent magnet material 7 minute to match the desired magnetization width. Since the magnetic flux passes through the permanent magnet material 7 while diverging in the direction of the arrow, the magnetic force of the permanent magnet material 7 becomes weaker as the depth of the permanent magnet material 7 increases. Further, the permanent magnet material 7 is magnetized into multiple poles at a minute pitch.

The magnetizing device 10 performs magnetization by shifting the core 8 by a predetermined pitch and reversing the magnetic flux.

This situation is shown in FIG. At that time, the magnetic flux of the primary magnetized part (solid line in Figure 14) also passes through the previously magnetized part (the ag part in Figure 14), so the magnetic force is further weakened. Therefore, as is clear from the above description, in order to magnetize the permanent magnet material 7 at minute pitches, a decrease in magnetic force is inevitable, and sufficient performance cannot be obtained.

Therefore, we magnetized permanent magnet material by dividing it into minute rectangles for each magnetic pole pitch, and then glued them one after another.
Another possible method is to obtain two microscopic magnetized permanent magnets.

According to this method, although the permanent magnet material is sufficiently magnetized, the manufacturing precision and adhesion accuracy of the micro permanent magnet materials are low, and when a large number of the micro permanent magnet materials are combined, the magnetization pitch of the permanent magnet is This causes a problem that sufficient performance cannot be obtained when used in an actuator.

In this way, the conventional technology solves the following two problems at the same time: (1) Permanent magnet material cannot be magnetized with high magnetic force at a minute pitch, and (2) Permanent magnet material cannot be magnetized with high precision at a minute pitch. I couldn't.

In addition, in the explanation of FIG. 12, the case where the permanent magnet 1 side is used as the mover 6 and the A-phase magnetic pole and B-phase magnetic pole sides wound with the coils 4 and 5 respectively are used as the stators 2 and 3 is illustrated. On the contrary, if the permanent magnet 1 side is used as a stator, and the A-phase magnetic pole and B-phase magnetic pole sides around which the coils 4 and 5 are respectively wound are used as a movable element, the same problem occurs.

The purpose of the present invention is to enable fine-pitch field magnets such as linear actuators to be magnetized with high precision and high magnetic force, and to significantly improve product quality and reliability compared to conventional methods. An object of the present invention is to provide a method for manufacturing a magnetic structural member that can be manufactured.

[Means for solving problems]

The object is to provide a method for manufacturing a magnetic structural member in which N poles and S poles of permanent magnets are arranged alternately and at equal pitches in the longitudinal direction on a yoke surface.
This is achieved by attaching permanent magnets having one polarity among the south poles at a certain interval, and then attaching permanent magnets having the other polarity within the interval.

[Effect]

According to the present invention which employs the above manufacturing method, when manufacturing a field magnet with a fine pitch such as a linear actuator, a permanent magnet having one polarity of N pole or S pole is set in advance at a constant value. By attaching the field magnets to the yoke with a gap between them, and then attaching a permanent magnet having the other polarity within the gap, the fine pitch of the field magnets can be maintained with high accuracy. . That is, the minute pitch precision of this type of permanent magnet in which N poles and S poles are arranged alternately depends largely on the processing precision when attaching the permanent magnet to the yoke, but in the present invention, as described above, A permanent magnet with one polarity (N-pole or S-pole) is placed independently with a certain distance from the yoke (i.e., without the presence of an interfering object) prior to a permanent magnet with the other polarity. Because it is attached to
It is easy to maintain that fine pitch with high precision,
Further, the permanent magnet having the other polarity can be easily mounted within the interval of the permanent magnets that have already been mounted with high precision on the yoke without considering mounting accuracy, Moreover, in this way, the mounting accuracy of the permanent magnets mounted later can be guaranteed, and the reliability of the product can be improved.

In addition, in the method of the present invention, since the N-pole and S-pole permanent magnets are separately attached to the yoke, each permanent magnet material has the magnetizing effect of the other permanent magnet material. It is possible to separately magnetize with high magnetic force without affecting the magnetic field, and the quality of the product can be improved.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 1(a) is an explanatory diagram of the configuration of a magnetic structural member manufactured by the method of the present invention, and FIG. FIG. 2(a) is a perspective view of the magnetic structural member shown in FIG. An explanatory diagram of the structure of the attached magnetic structural member, FIG. 2(b) is the second
1. In the method of the present invention, first, as shown in FIG. A plurality of type permanent magnets 11 are attached to the movable element 6 at intervals of a minute magnetization pitch T.

Next, as shown in FIG. 1, a rectangular parallelepiped permanent magnet 12 with a width equal to the minute magnetization pitch T and a height H is attached to the gap between the permanent magnets 11.

Therefore, according to the method of the present invention, as described in the above [Operation] section, when manufacturing a field magnet with a fine pitch such as a linear actuator.

Permanent magnets having one polarity of N-pole and S-pole are attached to the yoke at a certain interval in advance, and then a permanent magnet having the other polarity is attached within the said interval. As a result, the fine pitch of the field magnet described above can be maintained with high accuracy. In other words, the fine pitch accuracy of this type of permanent magnet with alternating north and south poles is:
Although it greatly depends on the processing accuracy when attaching the permanent magnet to the yoke, in the present invention, as described above, a permanent magnet having one of the polarity of N pole and S pole is used.

Prior to the permanent magnet of the other polarity, it is attached independently to the yoke at a certain distance, that is, without the presence of any interfering objects, so it is difficult to maintain the minute pitch with high precision. Moreover, the permanent magnet having the other polarity can be easily mounted within the interval of the permanent magnets that are already mounted with high precision on the yoke without considering the mounting accuracy. Moreover, in this way, it is possible to guarantee the mounting accuracy of the permanent magnet that is attached later, and the reliability of the product can be improved.6 In addition, in the method of the present invention, Since each permanent magnet of the pole is attached to the yoke separately, each permanent magnet material does not affect the magnetization effect of other permanent magnet materials.

It can be magnetized separately with high magnetic force, and the quality of the product can be improved.

In addition, in FIGS. 1 and 2, permanent magnets 1, t,
12, if a plastic permanent magnet material made of a mixture of magnetic powder and resin is integrally molded into the movable element yoke 6 by injection molding or the like, high precision in the shape, two dimensions, etc. can be extremely easily achieved.

FIG. 3 is an explanatory diagram of the main part configuration of a PM type linear pulse motor equipped with the magnetic structural member shown in FIG. 1. In FIG. 3, the same reference numerals as in FIG. 12 indicate the same parts.

In addition, in FIGS. 1 to 3, permanent magnets 11 and 12
In the example shown in FIG. 3, magnetic poles equipped with permanent magnets 11 and 12 are used as a stator, and A-phase magnetic poles and B-phase magnetic poles are respectively wound with coils 4.5. The magnetic pole may be used as a mover.

Furthermore, in FIG. 3, the stators 2 and 3 are provided on both sides of the mover 6, but as shown in FIG. There is no need to explain again here that it can be provided.

4 to 7 show other specific structural examples of magnetic structural members in the process of being manufactured by the method of the present invention, and FIG. 4, FIG. 5(a), FIG. 6, and FIG. FIG. 5(b) is a perspective view of a magnetic structural member in which only one type of permanent magnet 11 is attached to the yoke 6, and FIG. 5(b) is a sectional view taken along line AA' in FIG. 5(a).

Therefore, in Fig. 4, a plastic permanent magnet 1 is attached to the mover 6.
1, the plastic permanent magnet 11 is made to be integrated without interruption on the side surface of the mover 6. According to this, since the permanent magnet 11 is not divided into each magnetic pole, For magnet molds,
There is no need to separate the plastic permanent magnet material inlet into a window for each magnetic pole, and the magnet can be easily formed.

FIG. 5(a) shows that when molding the plastic permanent magnets 11 on the mover 6, the plastic permanent magnets 11 are provided on the upper surface and both sides of the mover 6, and as shown in FIG. 5(b), The plastic permanent magnets 11 on both sides are extended to the end of the back surface of the movable element 6, thereby making it difficult to separate the plastic permanent magnets 11 from the movable element 6.

In FIG. 7, a protrusion 13 is provided on the side surface of the movable element 6, and a plastic permanent magnet 1] is integrally molded onto the protrusion 13 to prevent the plastic permanent magnet 11 from moving in the longitudinal direction of the movable element 6. be.

In FIG. 11, a recess 14 is provided on the side surface of the movable element 6 by a width corresponding to the width T of the plastic permanent magnet 11 to prevent the plastic permanent magnet 11 from moving in the longitudinal direction of the movable element 6. .

8 to 10 show still other specific structural examples of magnetic structural members to be manufactured by the method of the present invention, and FIG.
) is a perspective view showing how to attach one type of permanent magnet 12 to a rotary motor rotor 15 equipped with one type of permanent magnet 11, and FIG. figure(
It is a BB' sectional view of a).

As shown in FIG. 8(a), after the plastic permanent magnets 11 are integrally molded at the same angle θ, the plastic permanent magnets 11 are placed on the motor rotor 15, and then the air gap between the plastic permanent magnets 11 is removed. A plastic permanent magnet 12 of another polarity is attached to the part, and one rotor 15 is attached as shown in FIG. 8(b).
An L-shaped protrusion 16 is provided at the tip of the plastic permanent magnet 11, and the plastic permanent magnet 11 is extended to the inner peripheral side of the protrusion 16.
5 can be prevented from peeling off.

Although not shown in FIG. 8(a), a stator wound with a coil is arranged above the rotor 15, facing the plastic permanent magnets 11, 12.

FIG. 9 is a modification of FIG. 8, which is similar to FIG. 8(a).
It is a sectional view corresponding to the BB' line.

Then, as shown in FIG. 9, the plastic permanent magnet 1
1 [Furthermore, by providing the permanent magnets 12 shown in FIG. 8(a), not shown] on both the upper and lower surfaces of the rotor 15, the stator can be placed on both the upper and lower sides of the rotor 15.

FIG. 10(a) is a perspective view of a magnetic structural member in which two types of permanent magnets 11.12 are mounted on the circumferential surface of a rotor 17 for a rotary motor, and FIG. 10(b) is a perspective view of a magnetic structural member shown in FIG. ) c-c'
FIG. Although the stator is not shown in FIG. 10(a), it is arranged to face the circumferential surface of the rotor 17.

In FIG. 10, as shown in FIG. 10(b), protrusions 18 having a T-shaped cross section are provided on both sides of the rotor 17, and plastic permanent magnets are placed so as to cover the protrusions 18. 11 is integrally molded. Accordingly, the plastic permanent magnet 11 can be prevented from peeling off due to centrifugal force while the rotor 17 is rotating.

〔Effect of the invention〕

The present invention is as described above, and as is clear from the description of the above embodiments, according to the present invention, it is possible to magnetize a field magnet with a fine pitch such as a linear actuator with high precision and high magnetic force. Thus, a method for manufacturing a magnetic structural member can be obtained, which can significantly improve product quality and reliability compared to conventional methods.

[Brief explanation of the drawing]

FIG. 1(a) is an explanatory diagram of the configuration of a magnetic structural member manufactured by the method of the present invention, FIG. 1(b) is a perspective view of the magnetic structural member shown in FIG. 1(a), and FIG. 2(a) 2(b) is an explanatory diagram of the configuration of a magnetic structural member that is currently being manufactured by the method of the present invention, that is, a magnetic structural member in which only one type of permanent magnet, indicated by reference numeral 11 in FIG. 1, is attached to the yoke 6. Figure 2 (
3 is a perspective view of a), FIG.
7 to 7 show other specific structural examples of magnetic structural members in the process of being manufactured by the method of the present invention, and FIGS. 4 and 5 (a
), Figures 6 and 7 each show one type of permanent magnet 1.
FIG. 5(b) is a perspective view of the magnetic structural member with only 1 attached to the yoke 6, and FIG. 5(b) is a sectional view taken along line AA' in FIG.
FIG. 10 shows still another specific structural example of the magnetic structural member to be manufactured by the method of the present invention, and FIG. 8(a) shows a rotor 15 for a rotary motor equipped with one type of permanent magnet 11.
8(b) is a perspective view showing the installation procedure when attaching another type of permanent magnet 12.
-B' sectional view, FIG. 9 is a sectional view corresponding to line BB' in FIG. 8(a), and FIG. 10(a) shows two types of A perspective view of a magnetic structural member equipped with permanent magnets 11 and 12, FIG.
Fig. 11 is a perspective view showing the specific structure of the magnetic structural member manufactured by the conventional method;
Figure 2 is an explanatory diagram of the main part configuration of the PMM linear pulse motor equipped with the magnetic structural member shown in Figure 11, Figure 13, and Figure 1.
FIG. 4 is a basic conceptual diagram when magnetizing the magnetized surface of the permanent magnet material 7 for a PM type linear pulse motor using a conventional magnetizing bag [10]. 6...Mover, 11 and 12...Permanent magnet, 15
Cb) 2nd (b) Me 3 Kuni No. 46 $5 6th Me 'T I Nara 8 (2) ((L) and 9 Figure 10m 11th Mete 12

Claims (1)

[Claims] 1. With respect to the longitudinal direction on the yoke surface, the N pole and S pole of the permanent magnet
In the method for manufacturing a magnetic structural member in which poles are arranged alternately and at equal pitches, permanent magnets having one polarity of N pole and S pole are attached to the yoke at regular intervals, A method of manufacturing a magnetic structural member, characterized in that a permanent magnet having the other polarity is then mounted within the interval. 2. In the invention described in claim 1, permanent magnets having one polarity of N pole and S pole are attached to both the front and back surfaces of the yoke at a constant interval, and then the said interval is A method for manufacturing a magnetic structural member in which a permanent magnet having the other polarity is attached. 3. In the invention described in claim 1 or 2, the N-pole magnet and the S
A method of manufacturing a magnetic structural member in which a plastic permanent magnet material is integrally molded onto a yoke surface as a magnet material for at least one of the pole magnets. 4. In the invention set forth in claim 3, a magnetic structural member is formed by integrally molding plastic permanent magnets of the same polarity attached at a constant interval and connected in series with a part of each plastic permanent magnet. production method. 5. A method of manufacturing a magnetic structural member according to any one of claims 1 to 4, in which a magnet is attached to a part of the yoke by providing a means for preventing magnet displacement.