JPS60241768A - Linear pulse motor - Google Patents

Abstract

PURPOSE:To reduce a leakage magnetic flux by coupling two pairs of pole members disposed at the prescribed interval from the secondary side scale, mounting a pair of exciting coils on two pairs of pole members, and further mounting a permanent magnet on the pole members. CONSTITUTION:Two pairs of pole members 21-24 are disposed at the prescribed interval from the secondary side scale 42, and coupled by coupling members 20. A pair of exciting coils 25, 27 are disposed along the lateral direction of the scale 42 to mount the members 21-24. Further, a pair or two pairs of permanent magners 30, 31 are disposed along the longitudinal direction of the scale 42 to mount them on the two pairs of pole members 21-24. The scale 42 is moved along the longitudinal direction by supplying the prescribed pulse signal to the coils 25, 27.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a linear pulse motor, and in particular to a linear pulse motor suitable for use as a head feeding motor for various printers and floppy disk drives that require miniaturization. Regarding smoke.

[Prior art]

As is well known, a linear pulse motor moves a magnetic flux generator or a secondary scale (hereinafter simply referred to as a scale) in steps based on a pulse signal supplied to a primary magnetic flux generator (hereinafter simply referred to as a magnetic flux generator). The principle of operation is as shown in FIG. In this figure, 1 is a scale composed of a long plate, and its upper surface has uneven teeth ia, 1a, . . .
are formed at equal intervals in the longitudinal direction. This scale 1
On the upper surface, there is a support mechanism consisting of rollers etc., U-shaped cores 4 and 5 around which coils 2 and 3 are wound, respectively, and core 4.
and 5 with the polarity illustrated between lll1i! A magnetic flux generating device 7 consisting of a permanent magnet 6 is mounted. In this case, the magnetic flux generator 7 is movable in the longitudinal direction of the scale 1 by the support mechanism, and:]74.5(
7) Each lower surface of the magnetic poles 4a, 4b, 5a, 5b and the tooth portion 1a,
A predetermined gap is formed between each of the upper surfaces of 1a, . . . . Also, magnetic poles 4a and 4b and 1ift pole 5
a and 5b are arranged at intervals of 1/2 pitch with respect to the pitch of teeth ia, ia, ... of scale 1, and cores 4 and 5 are arranged at intervals of 1/4 pitch. There is. Then, by sequentially supplying predetermined pulse signals to the coils 2.3, the magnetic flux generated by the coil 2 (dotted line A shown in the figure), the magnetic flux generated by the coil 3, and the magnetic flux generated by the permanent magnet 6 (dotted line A shown in the figure) are generated. The solid line B) shown in FIG.
4b, 5a, and 5b, the magnetically stable position of the magnetic flux generating device 17 relative to the scale 1 is sequentially moved, and thereby the magnetic flux generating device 7 is moved along the longitudinal direction of the scale 1. Note that the magnetic flux generator 7
It is also possible to fix the scale 1 and move the scale 1.

However, the R1 linear pulse motor linearly advances by a predetermined distance according to the input pulse signal, so it can be used as a head feed motor for printers and floppy disk drives that require a linear motion function and a positioning mechanism. However, in recent years, along with the market demand for downsizing of printers, floppy disk drives, etc., there has been a strong demand for downsizing of linear pulse motors.

Therefore, a linear pulse motor as shown in FIG. 3 has been developed and put into practical use. In this figure, 10 and 11 are character-shaped core units in which coils 12 and 13 are wound, respectively, in the center, and these are arranged horizontally, and each magnetic pole 10a, 10b and 11a, 11b are connected to each other. They are arranged in a state where they face each other and are fixed to the permanent magnet 16 by adhesive or the like. Also, each Ii! 1 pole 10a, 10b, 1
The upper surfaces of 1a and 11b have comb-like teeth 10a- and 10b.
−.

11a'' and 11b- are formed respectively.The permanent magnet 16 is magnetized with various polarities as shown in FIG. The magnetic flux generating device 118 is configured as described above, and this magnetic flux generating device 18 is attached to the mounting member 17.
and the guide member 14.15, the magnetic pole 10a,
10b, 11a, and the upper surfaces of 11b through balls 19, 19..., and by supplying predetermined pulse signals to coils 12 and 13, as shown in FIG. The scale 1 moves 1 PIJ along its longitudinal direction using the same operating principle as shown in FIG.

[Problem that the invention seeks to solve]

By the way, although the conventional linear pulse motor shown in FIG. 3 can satisfy the demand for miniaturization to some extent, it still has the following drawbacks.

■ Although it is difficult to process the permanent magnet 16 into the desired shape, since it is used as a channel member, its shape becomes larger than necessary, and as a result, the permanent magnet 16 becomes There is a drawback that leakage magnetic flux increases.

■ The permanent magnet 16 has magnetic poles 10a, 10b, and 11a.

Coils 12 and 1 occupy the lower part of coil 11b.
3 is located on the side of the permanent magnet 16, and as a result, the size of the magnetic flux generating device 18 becomes long along the longitudinal direction of the scale 1, which is a drawback.

[Means to solve the problem]

Two pairs of magnetic pole members arranged at a predetermined distance from the secondary scale are connected to each other by a connecting member, and a pair of excitation coils are arranged along the width direction of the secondary scale. Each of the two pairs of magnetic pole members is attached via a magnetic connection means, and one or two pairs of permanent magnets are arranged along the longitudinal direction of the secondary scale and attached to each of the two pairs of magnetic pole members. The structure is as follows.

(Function) As a result, leakage magnetic flux from the permanent magnet is reduced, and the dimension along the longitudinal direction of the secondary scale of the magnetic flux generator is shortened.

〔Example〕

Embodiments of the present invention will be described above with reference to the drawings. FIG. 1 is an exploded perspective view showing the configuration of a linear pulse motor according to an embodiment of the present invention. In this diagram,
Reference numeral 20 denotes a connecting member made of a rectangular plate-shaped non-magnetic material, and a pair of magnetic pole members 21 and 22 are provided on the side surfaces thereof.
are fixed respectively, and a pair of magnetic pole members 2 are attached to the other side.
3 and 224 are each fixed. In this case, the fixing method may be an adhesive method, a sintering method, or a method using plastic. Further, a concave notch 2 extending in the horizontal direction is provided at the lower end of each side surface of each of the magnetic pole members 21 to 24 parallel to the side surface of the connecting member 20.
1a to 24a are formed respectively. Both ends of a rectangular iron core 26, around which an excitation coil 25 is wound in the center, are respectively fitted into the notches 21a and 22a, and similarly, the excitation coil 25 is fitted into the notches 23a and 24a. Both ends of the iron core 28 around which the coil 27 is wound are fitted. In addition, the connecting member 2 of each magnetic pole member 21 to 24
Permanent magnets 30 and 31 are placed on each side perpendicular to the side of 0.
are attached to each. In this case, the permanent magnet 30 is arranged so that the magnetic pole face of the north pole contacts the magnetic pole member 21 and the magnetic pole face of the south pole contacts the magnetic pole member 23, and the back surface of the magnetic pole face is made of a magnetic material. The back plate 32 is attached with a mounting number. Similarly, the permanent magnet 31 is arranged so that the magnetic pole face of the north pole contacts the magnetic pole member 22 and the magnetic pole face of the south pole contacts the magnetic pole member 24, and a back plate 33 is attached to the back surface of the magnetic pole face. It is being On the other hand, a connecting member 20 is provided on the upper surface of each of the magnetic pole members 21 to 24.
Comb-shaped tooth portions 21b to 24b are formed at equal intervals in parallel with the side surface of the plate. In this case, the teeth 21b and 23
b, and the tooth portions 22b and 24bt & have a relative displacement of 174 pitches. Furthermore, concave guide grooves 358 and 35b are formed on the upper surfaces of the magnetic pole members 21 to 24 and the upper end surface of the connecting member 20, respectively, and extend along both edges thereof in a direction perpendicular to the side surface of the connecting member 20. Two rollers 36 are provided in each of these guide grooves 35a and 35b.
36 and a retainer 37 that supports these rollers 36, 36 in a movable manner are respectively fitted in a movable manner, and retainers 37 are provided at both ends of the guide grooves 35a and 35b.
regulating members 38, 38. ... are attached to each. Further, rollers 36, 36, etc. are interposed above the magnetic pole members 21 to 24, so that the slit plate 40 and the scale base 4 are separated from each other by a predetermined gap.
A long plate-shaped scale 42 made of 1 is mounted. In this case, the scale 42 has rollers 36, 36. By coming into contact with..., it is supported so as to be movable in its longitudinal direction, and its movement in the width direction is restricted by a guide member (path shown). The slit plate 40 also has two rows of slits 40a, 4Qa, which are divided into two at the center in the width direction.
-... and 4Qb, 40b, -'' are formed at equal intervals in the longitudinal direction. These slits 40a, 40a
, ... and 4Qb, 40b, "' is tooth part 2
The slits 40a, 40a, . . .
0b, 40b, . . . are formed with a displacement of 1/2 pitch relative to them.

In the above configuration, by fixing the connecting member 20 and supplying predetermined pulse signals to the coils 25 and 27, the scale 42 can be moved along its longitudinal direction similarly to the conventional linear pulse motor shown in FIG. and move.

According to the embodiment described above, the connecting member 20 constituted by a non-1af' unit is used as a structural member that connects the magnetic pole members 21 to 24 with each other, and also as a member for fixing the magnetic flux generating device 7. Therefore, it is no longer necessary to use the permanent magnet 30.31 as a structural member as in the past, and this makes it possible to use the permanent magnet 30.31 with appropriate dimensions.
As a result, permanent magnets 30.
The leakage magnetic flux from 31 can be minimized. Also, permanent magnets 30, 31 are placed on the sides of the magnetic flux members 21 to 24, and excitation coils 25, 27 are installed! L pole members 21-2
4, the size of the scale 42 of the magnetic flux generating device 7 along the moving direction can be minimized. In addition, in the manufacturing stage, the permanent magnets 30 and 31, which have been magnetized in advance on the back plates 32 and 33, are attached to the magnetic pole members 21 to 24 in the final assembly process of the magnetic flux generator.
Since it is only necessary to attach them to each of the parts, the assembly work becomes easy and there is no possibility of iron powder etc. adhering to the parts during the work.

Furthermore, when performing mass production, the connecting member 20 and the magnetic pole member 21 are
- 24 may be fixed by sintering.

In the above embodiment, the scale 42 is on the movable side, but it is of course possible to use the magnetic flux generator on the movable side. Alternatively, each of the permanent magnets 30 and 31 may be divided into two parts and attached to each of the magnetic pole members 21 to 24.

〔Effect of the invention〕

As explained above, according to the present invention, two pairs of magnetic pole members arranged at a predetermined gap from the secondary scale are connected to each other by a connecting member, and a pair of excitation coils are connected to the secondary side scale. disposed along the width direction of the side scale and attached to the two pairs of magnetic pole members via magnetic connection means, and one
Since a pair or two pairs of permanent magnets are arranged along the longitudinal direction of the secondary scale and attached to each of the two pairs of magnetic pole members, leakage magnetic flux from the permanent magnets can be reduced, and the magnetic flux This provides an advantage in that the dimension along the longitudinal direction of the secondary scale of the generator can be shortened.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing the configuration of a linear pulse motor according to an embodiment of the present invention, Fig. 2 is a diagram for explaining the operating principle of a conventional linear pulse motor, and Fig. 3 is a diagram of a conventional linear pulse motor. FIG. 4 is a perspective view showing the configuration of the third
FIG. 2 is a perspective view showing the configuration of the permanent magnet 16 shown in the figure. 20...Connection member, 21-24...Magnetic pole member, 25.27...Excitation coil, 26.
28...Iron core, 30.31...Permanent magnet, 32.33...Back plate, 36...
...Roller, 37...Retainer, 40...
... Slit plate, 41 ... Scale base, 42 ... Secondary scale. Applicant Shinko Electric Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] By generating magnetic flux in the gap formed between the primary magnetic flux generating device and the elongated plate-shaped secondary scale, the secondary magnetic flux generating device or the secondary scale is connected to the secondary scale. In a linear pulse motor that moves linearly along a longitudinal direction, two pairs of magnetic pole members are arranged with the secondary side scale separated from the gap, a connecting member that connects the two pairs of magnetic pole members to each other; A pair of excitation coils arranged along the width direction of the secondary scale and attached to the two pairs of magnetic pole members via magnetic connection means respectively; one or two pairs arranged and attached to the two pairs of magnetic pole members, respectively;
A linear pulse motor comprising a pair of permanent magnets.