JPH0416635Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an improvement in the structure of a moving coil type linear motor for driving a vehicle curtain or other arbitrary article.

"Prior Art" In a conventional linear motor, as shown in FIG. 5, permanent magnets 2,
All main components such as the yokes 3, 3', the power supply overhead wire 4, and the moving coil 5 are inserted and housed from the end of the rail 1. It was not possible to partially increase the thickness and physical dimensions of the magnet 2. Also, when manufacturing curved linear motors,
Since it is impossible to insert a curved yoke and a magnet from the end of a curved rail, the straight yoke and magnet were inserted from the end of a straight rail and the rail 1 was bent after assembly. The problem was that the magnets were cracked and the performance of the curved linear motor was uneven and unstable. Furthermore, since the components of the linear motor are inserted from the end of the rail 1, it is difficult to assemble a long linear motor. The moving coil type linear motor described in Japanese Utility Model Application Publication No. 117685/1985 has a groove-shaped permanent magnet holder on a rail having an inverted U-shaped cross section to hold a yoke and a permanent magnet on the left and right sides of the cross section of the linear motor. The magnet and yoke are placed on the inner surface of a rail with a constant thickness made of aluminum extrusion, so the thickness of the magnet can be changed arbitrarily within the same motor. However, there is a serious drawback in that the thrust cannot be adjusted at necessary locations where it is desired to increase the thrust, such as the corners of the curved linear motor and both ends of the motor. Further, when manufacturing a curved linear motor, it is impossible to insert the curved yoke and magnet from the end of the curved rail. After inserting the linear yoke and magnet from the end of the linear rail, there was a drawback that the permanent magnet would break if the rail was bent. The moving coil type linear motor described in Japanese Utility Model Application Publication No. 183590/1983 has a rail with an inverted U-shaped cross section, and a permanent magnet holding part for holding a yoke and a permanent magnet inside one side of the cross section of the rail. It is just a linear motor that is shaped, and the magnet and yoke are placed inside the rail, so the thickness of the magnet cannot be changed arbitrarily locally within the same yoke. A serious drawback is that the thrust cannot be adjusted at the necessary parts such as at both ends of the motor where it is desired to increase the thrust. Further, when manufacturing a curved linear motor, it is impossible to insert the curved yoke and magnet from the end of the curved rail. After inserting the linear yoke and magnet from the end of the linear rail, there was a drawback that the permanent magnet would break if the rail was bent.

``Problems to be solved by the invention'' The invention was made in view of the above problems, and involves partially changing the thickness of the permanent magnets within the same motor to adjust the thrust in the required parts. In addition, it is possible to assemble the curved permanent magnets and yokes after bending the rail during manufacturing of the curved linear motor, and it is also possible to assemble the permanent magnets and yokes even in the case of long linear motors. An object of the present invention is to provide a linear motor that can be easily assembled to a rail.

"Means for Solving the Problems" According to the present invention, there is provided a rail having an inverted U-shaped cross section and a permanent magnet holding portion that is curved on the inner surface, and at least one side of the rail. A permanent magnet is arranged on the outer surface in a flat plate shape and magnetized in the thickness direction so that adjacent magnetic poles have different polarities; A movable coil, a yoke facing both outer sides of the rail, and a power supply pattern arranged on the inner surface of the rail to energize a brush provided on the movable coil, and the magnet can be inserted from the outer surface of the rail. A moving coil type linear motor is provided.

"Function" According to the present invention having the above configuration, by arranging the magnets and yokes on the outer surface of the rail, the thickness of the magnets can be changed partially within the same motor, and the required parts can be The thrust can be adjusted. Further, when manufacturing a long linear motor, the work of assembling the magnet and yoke to the long rail can be done from the outside of the rail, making it extremely easy. Furthermore, when manufacturing a curved linear motor, the curved yoke and magnet of the required shape can be assembled from the outside of the curved rail after the rail is bent, which prevents cracking of the magnet and performance degradation due to bending the rail. can.

``Example'' Next, an example of the present invention will be described with reference to FIGS. 1 to 4.

The rail 1 made of extruded aluminum has a cross-sectional shape as shown in Fig. 1, and has an inverted U-shaped cross section as a whole, and has a permanent magnet holder on one leg that curves inward. 11, and the other leg is provided with a yoke holding part 12 curved toward the inner surface so as to face the permanent magnet holding part 11, and an overhead wire storage groove is provided on the upper inner surface of the rail 1. 13 is engraved. As shown in FIG. 2, the permanent magnet 2 and the yoke 3 are attached to the permanent magnet holding part 11 of the rail 1 from the outside of the rail 1, and the yoke 3' is attached to the yoke holding part 12.
is attached from the outside of the rail 1, and the power supply overhead wire 4 forming the power supply pattern is installed in the overhead wire storage groove 13.
is inserted into. The power supply overhead wire 4 is formed by printed wiring on a flexible printed board. A current collection brush 6 of a movable coil 5 is in contact with the power supply overhead wire 4 .

Assuming that the gap of the magnetic circuit, which is the distance between the permanent magnet 2 and the yoke 3', is constant, the thickness t of the permanent magnet 2 is
Therefore, it is possible to change the magnetic flux density in the gap to some extent within the same motor using permanent magnets made of the same material, increasing thrust at curved corners of curved linear motors and at both ends of the motor. Thrust force can be adjusted where needed.
The rail 1 is bent into a curved shape, as shown in FIG. There is no possibility of cracking, deterioration of performance, or deformation of the rail 1.

In a long linear motor, the rail 1 is long, but the permanent magnet 2 is connected from the outside of the rail 1.
Since all that is required is to attach the yokes 3 and 3', the attachment work becomes extremely easy (Fig. 3).

FIG. 4 is a schematic diagram illustrating the pattern shape of the power supply overhead wire 4 and the operation of the linear motor.

The power supply overhead wire 4 is formed of a printed circuit board as described above, and has two conductive parts 41 and 42. The conductive parts 41 and 42 are connected to the current collecting brush ends 61 and 42 of each coil 51 and 52 when the effective winding part of each coil 51 and 52 in the movable coil 5 is completely within the magnetic flux of one permanent magnet 2, respectively. 62 or 63 and 64 are energized. Further, when the polarity of the magnetic flux passing through the effective winding portion of each coil 51, 52 in the movable coil 5 is reversed, each coil 5
The conductive part 4 is connected so that the polarity of the supply to
1,42 patterns are formed. The one-dot chain line T in the figure indicates the current collecting brush end 61 of each current collecting brush 6.
64 trajectory is shown. Each conductive part 41, 42 is connected to a DC power source via an operation switch (not shown).

"Operation" The operation of the linear motor having the above configuration will be explained with reference to FIG. 4. In the figure, an arrow φ shown near the surface of the permanent magnet 2 indicates the direction of magnetic flux due to the permanent magnet 2. Further, the moving coil 5 shown in five stages shows the position in the longitudinal direction, and the moving coil at each position schematically shows the direction of the excitation current of each coil 51, 52 at the respective position. Further, arrow F indicates the direction of the force acting on the moving coil 5 according to Fleming's left-hand rule.

In the position shown in the first stage, the current collecting brush ends 61 and 62 of the coil 51 are in contact with the conductive parts 41 and 42, respectively, and the current collecting brush ends 61 and 62 of the coil 52 are in contact with the conductive parts 41 and 42, respectively.
3 and 64 are the conductive part 42 and the conductive part 41, respectively.
come into contact with. Then, the coil 51 is excited in the forward direction and the coil 52 is excited in the opposite direction, and together with the direction of the magnetic flux φ, the movable coil 5 receives a force F in the right direction in the drawing and moves to the position shown in the second stage.

In the position shown in the second stage, since the current collecting brush ends 63 and 64 of the coil 52 are separated from the conductive parts 41 and 42, only the coil 51 is excited by the current from the conductive parts 41 and 42, and the movable coil 5 is It moves in the right direction in the drawing due to force F.

At the position shown in the third stage, the current collecting brush ends 63 and 64 of the coil 52 start contacting the conductive portion 41 and the conductive portion 42, respectively, and an exciting current flows through the coil 52 in the positive direction. Then, the movable coil 5 receives a force F in the right direction in the drawing.

In the position shown in the fourth stage, the current collecting brush ends 61 and 62 of the coil 51 are detached from the conductive parts 41 and 42, and the current collecting brush ends 63 and 64 of the coil 52 come into contact with the conductive parts 41 and 42, so that they are movable. The coil 5 is moved in the right direction in the drawing by the force F.

In the position shown in the fifth stage, the current collecting brush ends 61 and 62 of the coil 51 start contacting the conductive part 42 and the conductive part 41, respectively, and the current collecting brush ends 63 and 64 of the coil 52 start contacting the conductive part 42 and the conductive part 41, respectively. Since the movable coil 5 comes into contact with the conductive portion 41, a current is passed through the coils 51 and 52 in opposite directions, and the movable coil 5 receives a force in the right direction in the drawing.

In this way, as the moving coil 5 moves,
The direction of the excitation current is switched according to the direction of the magnetic flux φ at the location where each coil 51, 52 is located, and the movable coil 5 is constantly subjected to a force F in one direction and moves in the longitudinal direction. In addition, in order to switch the moving direction of the movable coil 5, the conductive portion 41,
It is only necessary to switch the polarity of 42.

"Other Embodiments" Furthermore, in addition to the configuration of the above embodiments, it is also possible to add a permanent magnet 2 to the yoke 3 side as required. Conductive portion 4 in power supply overhead wire 4
The pattern shapes 1 and 42 are not limited to the illustrated embodiment, and can be changed to power feeding patterns having various pattern shapes. Further, the shape of the current collecting brush ends 61 to 64 in the current collecting brush 6 and the mounting structure for the coils 51, 52 are not limited to the embodiments, and can be changed to various brush ends, and the coils 51, 52 The connection structure of is also arbitrary.

"Effects" As mentioned above, since the linear motor of the present invention allows permanent magnets to be inserted from the outer surface of the rail, it is possible to change the thickness of the permanent magnets at necessary locations such as the corners and both ends of the rail. In addition to being able to adjust the thrust force, the magnet and yoke can be assembled from the outside surface of the rail, making it extremely convenient to assemble the magnet and yoke for curved linear motors and long linear motors. When manufacturing a curved linear motor, after the rail is bent, a curved yoke and magnet of the required shape can be inserted and assembled into the rail from the outside surface, so the straight yoke and magnet can be inserted into the straight rail and the rail bent. This has the excellent effect of preventing magnet cracking and motor performance deterioration due to this.

[Brief explanation of drawings]

Figures 1 to 4 show examples of the present invention, with Figure 1 being a sectional view of the rail, Figure 2 being a sectional view of the linear motor, Figure 3 being an exploded perspective view, and Figure 4 being for power supply. FIG. 5 is a schematic diagram illustrating the pattern shape of an overhead wire and the operation of a linear motor, and FIG. 5 is a sectional view showing a conventional linear motor. 1...Rail, 11...Permanent magnet holding part, 2...
...Permanent magnet, 3, 3'... Yoke, 4... Power supply overhead wire, 5... Moving coil, 6... Current collector brush.

Claims (1)

[Scope of utility model registration request] A rail having an inverted U-shaped cross section and a curved permanent magnet holding part formed on the inner surface, and a flat plate-shaped outer surface of at least one side of this rail, which is magnetized in the thickness direction, and adjacent magnetic poles have different polarities. a permanent magnet arranged as shown in FIG. A moving coil type linear motor comprising: a power supply pattern arranged on the inner surface of the rail to energize a brush provided on the rail, and the magnet can be inserted from the outer surface of the rail.