JPS62193543A - Moving-coil type linear motor - Google Patents

Abstract

PURPOSE:To improve efficiency by forming a moving flat coil portion by successively arranging a plurality of coils each having a coil width dimension not more than about one third to one fifth of the longitudinal width of one permanent magnet. CONSTITUTION:A stationary member is composed of permanent magnets 2 opposed to each other, between which a moving flat coil is placed as a moving part. To form this moving flat coil, a plurality of coils 12a-12c each having a coil width dimension not more than about one third to one fifth of the longitudinal width of the permanent magnet 2 are successively arranged on the same plane in the manner of adjoining each other so that the central parts of respective coils 12a-12c will not overlap each other. Therefore, only the central part of a coil placed within the air gap is made to have a thickness of one phase.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides a stationary member in which a moving coil is attached to a stationary member in which two magnetic strips in which a plurality of permanent magnets are arranged in a straight line are arranged opposite to each other with a gap. The present invention relates to a moving coil type linear motor that is disposed within the above-mentioned gap and in which a moving coil moves linearly along a magnetic strip.

[Background of the invention]

BACKGROUND ART Conventionally, as a drive device for moving over a long stroke and performing positioning, there is a moving coil type linear motor, for example, as described in Japanese Patent Publication No. 58-49100.

This moving coil type linear motor has magnetic poles arranged alternately on adjacent and opposing surfaces, and has a magnetic band tread section with a uniform gap in the longitudinal direction, and a magnetic flux in the gap and a winding direction. It consists of a flat coil section made by laminating a plurality of coils such that the coils are perpendicular to each other.

In such a moving coil type linear motor, at least two or more coils are arranged in a staggered manner in order to continuously move over a long stroke, resulting in a multiphase coil).
The direction of the magnetic pole is detected by a magnetic field detection element, etc., and the coil through which the current flows and its direction are switched. As the coil moves, current does not flow through the coil VC located at the boundary of the permanent magnet, so the efficiency of the heater is better if the coil is made into a multi-phase coil and driven by sequential switching. For example, in the case of a 2-phase coil, 1/2 of the total length of the coil, in the case of a 3-phase coil, 2/3 of the total length, and in the case of an N-phase coil, N of the total length
t@ force is generated at the part (NH) of (NH). Therefore,
The more phases there are, the greater the electromagnetic force will be generated.

However, in this structure, the flat coil is connected to the multilayer VC as many times as the number of phases.
Because of the laminated structure, the gap in the magnetic circuit section becomes wider, and the magnetic flux density in the gap decreases. Therefore, although the portion of the coil that passes through the coil becomes longer, the magnetic flux density decreases, resulting in the problem that electromagnetic force cannot be efficiently generated.

[Object of the Invention] The present invention was invented in view of the above-mentioned problems, and an object of the present invention is to provide an efficient multi-pole multi-phase coil movable linear motor.

[Summary of the invention]

In order to achieve the above object, the present invention has a plurality of coils having a coil width smaller than a fraction of the longitudinal width of one permanent magnet, arranged adjacently so that the center portions of the coils do not overlap each other. They are also arranged sequentially on the same plane, and have a feature in that a movable flat coil portion is formed within the gap, with only the center portion of the overlapping coil having a thickness equivalent to one phase.

[Embodiments of the invention]

An embodiment of the present invention will be explained with reference to the drawings.

In FIG. 1, a stationary part 1 in which a plurality of permanent magnets are arranged in the longitudinal direction to form a traveling path is formed as follows.

By sequentially reversing the magnetic poles of the rectangular parallelepiped permanent magnet 2, -
They are arranged closely in rows and fixed to the side yoke 3 with adhesive to form a magnetic strip.

The opposing surface VC of the magnetic strip forms a magnetic strip in which the magnets 2, which are similarly adhesively fixed to the side yoke 3, are arranged so that their magnetic poles are reversed, and both magnet strips are connected with an air gap between the opposing magnets. ! l
End yoke 5, plate 61' (
The assembled stationary part 1 is integrally formed. As shown in FIG. 1, the magnetic poles of the magnet 2 have different polarities Vc between adjacent and opposing surfaces, and lines of magnetic flux 7 are generated. Therefore, a magnetic flux 7a perpendicular to the longitudinal direction exists in the gap 4.

The movable part 11 is made up of a movable coil 12, a coil fixing jig 13, a table 14, and a slider i52 of the linear guide 15, as shown in FIG. The winding direction of the moving coil 12 is perpendicular to the magnetic flux 7a and in the plane of the longitudinal direction υ, and its shape is as shown in FIG. The portion 12' is thicker than the central portion. The movable coil 12 is fixed to the table 14 by a coil fixing jig 13,
Furthermore, the linear guide 15 is moved linearly on the track 3a fixed to the stationary part.

The structure of the moving coil 12 is shown in FIGS. 3, 4, and 5V.
This will be explained in more detail starting from C. Figure 3 is B-B of Figure 1.
This is a partially enlarged view in the direction of arrows, and shows a three-phase coil. The movable coil 12 is composed of three flat coils +28. It is manufactured by combining I2b and 12C. Flat coils 12b and 12ct: tThe coil width l is shifted from each other, so the centers of the coils do not overlap, and therefore the center of the movable coil 12 is 1
The thickness is only for the phase. The shape of the upper and lower ends +2'a l B'b l 12'c which are off from the magnet facing surface does not matter because there is ample space.

The cross section of the coil is the c-cWr plane in Fig. 3, the D-D cross section,
The B-E cross section is shown in (C) (1) in Figure 4, respectively.
)(e). FIG. 4(C) shows only one phase, FIG. 4(d) shows the thickness of two phases at the upper and lower ends, and FIG. 4(e) shows the thickness of three phases at the upper and lower ends. Each flat coil 12a,
12b and 12C are fixed in contact with each other in the recess of the insulator 16, and the whole is integrated.

The overall structural diagram of the moving coil 12 is a perspective view, and as shown in FIG. 5, the central part has a thickness equivalent to one phase, and this part is located in the magnetic flux a17 in FIG. There is.

As another embodiment, there is also a structure as shown in FIG. The moving coil 22 includes three-phase flat coils 23a, 2
3b, 23G and the insulator 26, and the whole is integrated with adhesive. Flat carp #23a T23b
1231) The center sh, like the previous example shown in FIG.
Only the two phases are bent by 45° and 90°Vc, respectively, and these angles are not particularly strict. The shape of the coil is shown in FIG. 7 taken along the line PP in FIG. 6, and the surface area is larger than that of the coil in FIG. 5.

Since this embodiment has a large surface area, heat dissipation is not a problem not only when the vehicle is running but also when the vehicle is stopped, and problems such as thermal deformation due to heat generated by the coil are reduced.

In the multi-pole multi-phase coil movable linear motor in which the stationary part 1 and the movable part 11 are combined as in both of the above embodiments,
It has the following advantages: Since it is a multi-phase coil, it is possible to energize coils other than the one phase at the magnet joint, and even if it is multi-phase, the coil thickness is one phase, so the gap does not widen.
Therefore, the magnetic flux density does not decrease. Therefore, the electromagnetic force of the flat coil can be increased, and the efficiency is also improved.

〔Effect of the invention〕

As explained above, according to the present invention, since a multi-phase coil is used, there are many coils that are energized, and even if the coil is multi-phase, the gap in the magnetic circuit does not widen to just one phase. Since the magnetic flux density does not decrease, it has the effect of increasing the electromagnetic force generated in the coil.

[Brief explanation of drawings]

FIG. 1 is a plan configuration diagram of a linear motor showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B-B in FIG. Figure 4 (C), (d)
, (e) shows the third (★ layer coil) of this example.
Figure) c-c, D-D, E-E position fI1. , V.C.
5 is a perspective view of the moving coil of this embodiment, FIG. 6 is a perspective view of the moving coil showing another embodiment, and FIG. 7 is a sectional view of the moving coil of FIG. 6. It is a sectional view taken along arrow P. 1... Stationary part 2... Permanent magnet 4... Air gap 7... Line of magnetic flux 7a... Magnetic flux 11... Moving part +23.12b, 12G... Moving coil 12a
', 12b', 12c'... Upper and lower ends 13...
Insulator 14 - Table 22a, 22b, 22G - Moving coil 22a', 22k)', 22C'...
- Upper and lower ends 23...insulator. Work, G72 engraving of diagrams and drawings (no changes to the contents) ¥6 haze procedural amendment (method) Patent application No. 32981 filed in 1988 Name of the invention Moving coil type linear motor Relationship of patent application person name
15101 Hitachi Rizakusho Representative Person

Claims (1)

[Claims] 1. A pair of stationary members made of a plurality of permanent magnets arranged alternately in the longitudinal direction so that adjacent magnetic poles are different, with the permanent magnet surfaces facing each other so that the facing magnetism is different. Facing,
Both stationary members are arranged so as to have a uniform width gap in the longitudinal direction that is slightly wider than one phase of the coil, and a plurality of stationary members each having a coil width dimension that is a fraction of the width in the longitudinal direction of one permanent magnet or less. consisting of a movable flat coil section in which coils are sequentially arranged next to each other on the same plane so that the center portions of the coils do not overlap each other, and only the center portion of the coil located within the gap has a thickness equivalent to one phase. A moving coil type linear motor featuring: 2. The movable coil type linear motor according to claim 1, wherein the movable flat coil portions are arranged back to back with an insulator in between.