JPS60109756A - Linear pulse motor - Google Patents

Abstract

PURPOSE:To maintain the accuracy of an interval between poles of toothed portions high by displacing the relative position between the toothed portions of a scale at both sides and a toothed portion of a core for a slider at the prescribed pitch. CONSTITUTION:Toothed portions 3a, 3b having a displacement of 1/4 pitch with respect to he pitch (l) of the toothed portions of a scale 3 for a linear pulse motor at both sides along the center line of the moving directon of a slider at the scale 3. Thus, when the scale toothed portions 3a, 3b corresponding to the ploles 6a, 6b of the corresponding toothed portions of cores 5, 6 are displaced at 1/4 pitch of the toothed portions of the scale, the interval between the poles of the toothed portions of series of rhe cores 5, 6 in the moving direction of a slider 4 is correctly defined in case of punching core materials. Accordingly, the accuracy of the intervals between the poles of the toothed portions can be maintained highly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a linear pulse motor that operates based on the interrelationship between the magnetic flux from a permanent magnet and the magnetic flux based on the excitation of each phase excitation coil.

Conventional Structures and Their Problems In recent years, linear pulse motors have made remarkable advances in industry, and in particular, they have come to be used as head drive devices for typewriters, printers, and the like.

The conventional linear pulse monitor will be explained below.

FIG. 1 is a diagram showing the principle of a conventional linear pulse motor. In FIG. 1, reference numeral 1 denotes a scale, on the surface of which teeth 1a are formed continuously in the longitudinal direction and at intervals. 2 is a slider, and the two peak iron cores 2a and 2b are connected to permanent magnets 2.
c, each core 2a, 2b
O tooth portions 2 a 1 , 2 a 2 , 2 b 1 .

2b2 has a % pitch deviation in the slider tooth portion 1'aK, and the tooth portions 2a1 and 2b
and 2 a 2 and 2 b 2 are deviated so as to cause a % pitch deviation in the scale tooth portion 1a. 2c
i, 2e are coils, coil 2d is toothed part 2a 1.2
It is wound around a2 and installed continuously in the opposite direction. The other coil 2e is connected to each toothed portion 2 of the iron core 2b.
b1, 2b2 in the winding direction as shown in the figure.

In the principle diagram of Figure 1, each coil 2d.

By controlling the excitation direction of the magnet 2e to switch in a predetermined order, it is possible to achieve stepwise movement of the scale tooth portion of the slider 20 by interaction with the magnetic flux from the permanent magnet 2c.

However, in the conventional configuration described above, (1) the spacing between the teeth between the cores 2a and 2b (for example, the spacing between the teeth 2a and 2b1) is extremely important for accurate positioning; It is extremely difficult to achieve accuracy while bridging at 2C.

@ In manufacturing, it is necessary to make the two slider iron cores 2a and 2b magnetically insulated from each other, to be able to assemble them once while receiving the magnetic attraction force of the permanent magnet 2C, and to have sufficient strength. It had several problems such as being a solid solution.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a linear pulse motor that can be manufactured easily while maintaining high positioning accuracy, and that can improve positioning accuracy. With the goal.

Structure of the Invention In order to achieve the above-mentioned object, the relative positions of the scale tooth portions on both sides of the slider for the unexploded IJII-jlJ near-pulse motor with respect to the center along the traveling direction and the iron core tooth portion for the slider are shifted by a pitch. In addition, by arranging N and S permanent magnets on both sides of the center line along the slider's advancing direction, we can maintain high positioning accuracy and improve manufacturing efficiency. It has excellent features such as being thinner and having greater thrust/weight, which improves responsiveness.

DESCRIPTION OF EMBODIMENTS 8IJ FIGS. 2, 3, and 4 show a perspective view, a front view, and an A-A/sectional view of the front view in one embodiment of the present invention. In each figure, 3 is a scale for a linear pulse motor, and the pitch is (
The tooth portions 3a and 3b are formed with a deviation of Dxl'). Reference numeral 4 denotes a slider for a linear pulse motor, which includes iron cores 5 and 6 having toothed magnetic poles facing each of the toothed portions 3a and 3b, a non-magnetic material 7 for magnetically insulating each of the iron cores 6 and 6,
It is composed of a permanent magnet 9 that generates magnetic flux through the iron cores 5 and 6, the scale 3 and the yoke 8, and coils 10 and 11.

By the way, in a state where the toothed magnetic pole 5aid of the iron core 5 is placed at a position facing the scale toothed portion 3a1, the 5
b is the toothed magnetic pole ea of the iron core 6 in the scale hole 3a2.
, eb are formed to be located in the middle of the scale teeth. That is, between the toothed magnetic poles 6a and 5b (toothed part e
The same applies to a and 6bK) is the scale tooth portion 3a, respectively.
, sb, with a spacing of /2 pitch, and toothed magnetic poles 5a,
6a (the same applies to the tooth portions 5b and 6b) has a % pitch [1] of the scale tooth portions 3a and 3b, respectively.

Regarding the configurations shown in FIGS. 2, 3, and 4, the specific operating principle will be explained with reference to FIG. As shown in FIG. 5, when a pulse current flows through the coil 10 of the iron core 6, the iron core 5 becomes magnetically stable and the dead iron core 6 becomes magnetically unstable. When the magnetic flux generated by the permanent magnet 9 is φ, m is shown in ta+ in FIG.

The magnetic flux φ is divided into two by the toothed magnetic poles 6a and 6b. However, from the toothed magnetic pole to a, φ. 10φ1 and is strongly restrained in that position, or the toothed magnetic pole 5b has φ. -φ□, and the magnetic flux is canceled out.

Next, when a pulse current flows through the coil 11 of the iron core 6, the iron core 6 becomes stable and the iron core 5 becomes unstable. In addition, in FIG. 5(c), the electromagnet 5 is shown in FIG. 6(-1
A pulse current is passed so that the polarity is opposite to that of the fifth
In FIG. 5(d), the slider 4 moves to the left by sequentially passing a pulse current through the electromagnet 6 so as to have a polarity opposite to that in FIG. 5(b). in this case,
The slider 4 moves with % pitch as one step.

In addition, in the explanation in Section 2, the relative positions of the Nanto magnetic poles 6a, 5b, 6a, 6b of the slider iron core 5°6 in the direction perpendicular to the slider movement direction are made to match, and Each tooth portion 5a.

An example was shown in which the tooth portions 3a and 3b of scale 3 corresponding to 5b, 6a, and eb were displaced by % pitch, but as shown in FIGS. 6, 7, and 8, the southern part of scale 3 The magnetic poles tsa and r of the slider cores 5 and 6 are aligned without shifting left and right along the advancing direction of the slider 4.
Even if the relative positions of sb, ea, and 6b in the direction perpendicular to the direction of movement of the slider 4 are shifted by % pitch of the scale teeth, completely uniform effects can be achieved. Furthermore, in the above explanation, the permanent magnet is shown to be located on the back side of the slider 4, but
As shown in FIGS. 9 and 10, it may be inserted between sliders 4. Also, the above theory! Ij Instead of 1-phase excitation, 2-phase or 1-2 phase excitation can be adopted. Furthermore, it goes without saying that the number of teeth 3j<interval of the magnetic pole core and the number of windings and the number of windings are not limited to the embodiment, and that some modifications can be considered.

As mentioned above, the effect of the unexploded E! AK (M Linear Pulse Smoke is a configuration in which drive control is performed based on the interaction between magnetic flux based on a permanent magnet and magnetic flux based on excitation of a coil provided on the peak magnetic pole for the slider (, 'J). The magnetic pole iron core for the slider is divided into two in the direction perpendicular to the direction of movement of the slider, and a permanent magnet is bridged between the backs of each magnetic core or between them, and the southern part of the scale corresponding to the corresponding toothed magnetic pole of each iron core is divided into two. % pinch displacement of the teeth.Based on this configuration, ■ The distance between the magnetic poles of a series of teeth of each iron core in the direction of movement of the slider is correctly regulated when punching the core. Compared to a configuration in which a permanent magnet or the like is involved, the accuracy of the magnetic pole spacing of each tooth can be maintained at a high level.

＠ Compared to the conventional structure of connecting the iron cores that are separated in the direction of slider movement, which requires increasing the size to maintain strength, this type of connection is not required, the thrust/weight can be increased, and the response is improved. It has excellent features such as being able to improve the

[Brief explanation of drawings]

Figure 1 is the principle configuration diagram of a conventional linear pulse motor, Figure 2
Figures 3 and 4 are a perspective view, a front view, and a sectional view showing a specific structure of the linear pulse smoke according to the present invention, respectively, and Figure 5 is a principle diagram for explaining the operation. , FIG. 6 is a perspective view showing another embodiment, FIGS. 7 and 9 are front views showing other embodiments, and FIGS. 8 and 10 are sectional views showing other embodiments. 3...Scale, 3a, sb...Scale teeth, 4...Slider, 5, 6...
...Magnetic pole iron core, 5a. 5b, ea, eb...Tooth base magnetic pole, 9...
・・Permanent magnet, 10.11・Old・・Coil. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 co-) (b) (C) (Figure 6) Figure 9 r-=A Figure 10

Claims (3)

[Claims] (1) In the longitudinal direction of the scale, two rows of scale teeth are formed in parallel and at equal pitches, and a slider that is provided opposite to the scale teeth and that slides in the longitudinal direction of the scale has the above-mentioned scale teeth. With the scale tooth pitch, the tooth magnetic poles are 2
When one set of tooth magnetic poles is opposed to one row of the scale teeth, the other one of the tooth magnetic poles is
The set includes a state in which the one set of tooth magnetic poles and one row of the scale teeth face each other, and a state in which the pitch of the scale teeth is shifted by i hit with respect to the other row of the scale teeth. A linear pulse motor characterized by facing each other. (2) The linear pulse smoke according to claim 1, wherein the two rows of scale teeth are provided in the longitudinal direction of the scale in a state where the scale teeth are hit-to-hit. (3) The linear pulse set forth in claim 1, characterized in that the two sets of tooth magnetic poles provided on the slider are provided with the scale teeth shifted by one hit. smoke.