JP2000262035A - Linear motor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear motor where the downsizing and cost reduction are possible. SOLUTION: Either a stator or a needle is composed of a stacked yoke member 11 which is made by stacking core members 9 and 10, where a plurality of core pieces 7 being made with their magnetic teeth 8 projected outward each, are disposed into a band shape, convex and concave parts 7a and 7b as coupling members, which couple at least a pair of fellow edges of the core pieces 7 of the stacked yoke member 11, and a coil member 12 which is wound on each magnetic teeth 8 of the stacked yoke member 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor, and more particularly to a structure of a stator or a movable element on which a coil is wound.

[0002]

2. Description of the Related Art In this type of conventional linear motor, as shown in FIG. 16, a coil 2 is mounted on an iron core 1 formed by laminating a number of comb-like iron plates having slots 1a formed at a predetermined pitch. And a movable element 4 which is provided opposite to the stator 3 and is movable through an air gap. As is apparent from the figure, the upper opening of the slot 1a is When the traveling magnetic field is generated by the coil 2, the traveling magnetic field is amplitude-modulated at a period equal to the pitch, and a force is generated in a direction to cancel the thrust of the linear motor, thereby causing a problem that the output is reduced. Therefore, FIG.
As shown in FIG. 7, a protrusion 1b is formed in the upper opening of the slot 1a.
It is also known that the stator 3 is formed by laminating a plurality of iron plates provided with holes, and the protrusion 1b narrows the upper opening of the slot 1a to effectively cope with the problem.

However, if the projection 1b is provided in the upper opening of the slot 1a, the upper opening of the slot 1a becomes narrower, so that the work of winding and fitting the coil 2 becomes extremely difficult. Occurs. Therefore, for example, in Japanese Patent Application Laid-Open No. 6-165469, FIG.
As shown in FIG. 8, branch portions 5c are formed on both sides of the tip end of each tooth 5a of the iron core 5 through cutouts 5b, and the coil 6 is wound or fitted into the slot 5d, and as shown in FIG. It has been proposed to bend the notch 5b to narrow the gap between the tips of the teeth 5a.

[0004]

The conventional linear motor is constructed as described above. After the coil 6 is wound or fitted into the slot 5d, the notch is bent and each tooth 5a is bent.
By narrowing the distance between the tips, the operation of winding or fitting the coil 6 is made relatively easy, and the problem that the output is reduced is solved. However, when the coil 6 is wound or fitted, although the upper opening of the slot 5d is widened, it does not become wider than the width of the slot 5d. Therefore, it is necessary to secure a passage for the winding nozzle (not shown), so that the winding density of the coil 6 is correspondingly reduced, and in order to obtain a predetermined capacity, the coil is increased in size.
If the coil 6 wound around a bobbin or the like is fitted in the slot 5d in advance, it is not necessary to secure a passage for the winding nozzle in the slot 5d, so that the winding density can be increased. In addition, there is a problem that the number of parts for connecting the coils 6 and the number of operations for connecting the coils 6 increase, thereby increasing costs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a linear motor capable of reducing the size and cost by enabling a straight winding without lowering the coil winding density. And a method for producing the same.

[0006]

According to a first aspect of the present invention, there is provided a linear motor in which one of a stator and a mover is arranged in a strip shape with a plurality of core pieces formed by projecting magnetic pole teeth outward. A laminated yoke member formed by laminating core members, and connecting means for flexibly coupling at least a pair of edges of core pieces of the laminated yoke member,
And a coil member wound around each magnetic pole taste of the laminated yoke member.

According to a second aspect of the present invention, in the linear motor according to the first aspect, the connecting means is formed by forming opposing end faces of the respective core pieces of the core member into an articulated shape. By sliding the shape portion by a predetermined amount, the core pieces are arranged so as to be sequentially shifted in the stacking direction of the core members.

According to a third aspect of the present invention, in the linear motor according to the first aspect, the connecting means is constituted by a thin portion formed so as to connect the respective core pieces of the core member.
By bending each thin portion, each core piece is sequentially shifted in the stacking direction of the core members.

According to a fourth aspect of the present invention, in the linear motor according to any one of the first to third aspects, a dovetail groove or a protrusion which can be fitted into the dovetail groove is provided on a side of the core member different from the magnetic pole teeth. It is formed.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a linear motor, comprising the steps of: bending a connecting means to radially expand a tip of a magnetic pole tooth; winding a coil member around the expanded magnetic pole tooth. It includes a step of turning and a step of returning the bent connecting means to the original state.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration of a linear motor according to Embodiment 1 of the present invention, FIG. 2 shows a configuration of a connecting means for connecting between core pieces of a laminated yoke member in FIG. 1, (A) is a plan view, (B)
Is a sectional view showing a section taken along line AA in FIG.
FIG. 3 is a plan view showing the configuration of the stator shown in FIG. 1, FIG. 4 is a view for explaining a method of winding the coils of the stator shown in FIG. 3, and FIGS. 5 and 6 show the first embodiment of the present invention. It is sectional drawing which shows the structure from which the structure of the principal part of a linear motor differs from FIG.

In the drawing, reference numeral 7 denotes a plate-shaped core piece made of a magnetic material, and a concave portion 7a and a convex portion 7b as connecting means are formed on the back surface on one end side, and the end surface 7c is formed on the concave portion 7a and the convex portion 7b. Is formed in an arc shape with the center of the center as the center. On the other end side, an end face 7d that can be fitted to the end face 7c of the adjacent core piece 7 is formed. It is protruding. Reference numeral 9 denotes a first core member in which a plurality of core pieces 7 are arranged via respective end faces 7c and 7d.

Reference numeral 10 denotes a second core member in which the respective core pieces 7 are alternately arranged in the longitudinal direction with respect to the first core member 9 and constitute a laminated yoke member 11 together with the first core member 9. The recesses 7a and the protrusions 7b of the core pieces 7 that are alternately stacked with the core member 9 and are adjacent to each other in the stacking direction are rotatably connected by fitting. The core piece 7 serving as the uppermost layer is formed with a hole 7e into which the projection 7b can be fitted. Reference numeral 12 denotes a coil wound around each magnetic pole tooth 8 via an insulating bobbin 13, and 14 denotes a holding member for holding the laminated yoke member 11 on a fixed side. These members 7 to 14 constitute a stator 15. A movable member 16 is disposed at a predetermined gap, that is, an air gap from the tip of each magnetic pole tooth 8 of the stator 15, and has a plurality of permanent magnets 17 mounted at a predetermined pitch on a side facing the stator 15. , 18 are winding machines for winding the coil 12 through the nozzle 19, 20
Is a winding jig that is driven to rotate by the drive shaft 21.

Next, a method of manufacturing the linear motor according to the first embodiment configured as described above will be described.
First, the first and second core members 9 and 10 are punched alternately by press punching and are sequentially laminated in a mold, and the concave portions 7a and the convex portions 7b facing each other in the laminating direction of the core pieces 7 are formed.
The two are fitted together, and are caulked and integrated to form a laminated yoke member 11 as shown in FIG. 2 (A). Then, the insulating bobbins 13 are attached to the magnetic pole teeth 8 of the laminated yoke member 11, respectively.

Next, as shown in FIG. 4, the laminated yoke member 11 is
Attach to 0. Then, each core piece 7 attached to the winding jig 20 is connected to the concave portion 7a and the convex portion 7b as connecting means.
, And the tip of each magnetic pole tooth 8 is radially expanded. Next, in a state where the tip of each magnetic pole tooth 8 is expanded as described above, winding is performed on each magnetic pole tooth 8 via a nozzle 19 by a winding machine 18, and the coil 1 is wound.
2 are formed.

Then, the winding jig 20 is driven by the rotation of the drive shaft 21, and the next new core piece 7 is sequentially placed on the winding jig 2.
0, and the winding is performed again to form the coil 12. After the same operation is repeated to assemble into the state as shown in FIG. 3, each core piece 7 side of the laminated yoke member 11 is held and fixed by the holding member 14 to form the stator 15. The linear motor is completed by disposing the mover 16 on the distal end side of 8 through an air gap. Then, a thrust is generated in the mover 16 by a traveling magnetic field generated by exciting each coil 12, and the load carried on the mover 16 is transported by the thrust.

As described above, according to the first embodiment, the concave portions 7a and the convex portions 7b as connecting means are rotated to bend between the core pieces 7, and the magnetic pole teeth 8 are radially expanded. Since the coil 12 is formed by winding, there is no need to secure a passage for the nozzle 19 even in the case of a straight winding, and it is possible to sufficiently increase the winding density, thereby enabling downsizing and cost reduction. Becomes Also, since the space between the core pieces 7 bent after winding is returned to the normal state, the opening width between the tips of the magnetic pole teeth 8 can be narrowed as shown in FIG. As shown in FIG. 6, since the ends of the magnetic pole teeth 8 can be brought into contact with each other to eliminate the opening width, the movement of the mover 16 can be made smooth.

Embodiment 2 FIG. FIG. 7 is a sectional view showing a configuration of a linear motor stator according to a second embodiment of the present invention. FIG. 8 shows a configuration different from that shown in FIG. 7 of the linear motor stator according to the second embodiment of the present invention. It is sectional drawing. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 22 denotes a plurality of core pieces, each of which is made of a magnetic material and has a dovetail groove 22a formed on a side corresponding to a holding member to be described later, and is flexibly connected via a thin portion 23 as a connecting means. Reference numeral 24 denotes a magnetic pole taste formed to protrude outward from each core piece 22. Reference numeral 25 denotes a core member formed by these 22 to 24. A predetermined number of the magnetic members are laminated and integrated by, for example, caulking or the like. The yoke member 26 is configured. The coil 12 is wound around each of the magnetic pole teeth 24 of the laminated yoke member 26 via the insulating bobbin 13. Reference numeral 27 denotes a dovetail groove 22a at a position corresponding to the dovetail groove 22a of each core piece 22.
A plurality of protrusions 27a are formed on the holding member. The protrusions 27a are fitted into the dovetail grooves 22a to hold and fix the laminated yoke member 26 to form the stator 28.

As described above, according to the second embodiment, since the thin portion 23 as the connecting means is bent so that the core pieces 22 can be bent, the same as in the first embodiment. Since the coil 12 can be formed by performing winding in a state where the magnetic pole teeth 24 are radially expanded, it is possible to sufficiently increase the winding density and reduce the size and cost. Since the stacked yoke member 26 is fixedly held by fitting the projection 27a of the holding member 27 into the dovetail groove 22a of the core piece 22, it is possible to improve the mechanical strength.

In the structure shown in FIG.
The case where the dovetail groove 22a is formed on the holding member 27 side and the protrusion 27a is formed on the holding member 27 side is described. However, as shown in FIG. 8, the protrusion 22b is formed on the core piece 22 side and the dovetail groove 27b is formed on the holding member 27 side. Needless to say, the same effect as described above may be obtained.

Embodiment 3 FIG. FIG. 9 is a sectional view showing a configuration of a stator of a linear motor according to Embodiment 3 of the present invention. In the figure, the same parts as those in the second embodiment are denoted by the same reference numerals, and the description is omitted. Reference numeral 29 denotes a holding member formed of a resin such as a thermoplastic resin such as polybutylene terephthalate or a thermosetting resin such as an epoxy resin. This resin is wound around each magnetic pole tooth 24 when the holding member 29 is formed. The coil 12 and the laminated yoke member 26 are integrally molded together with the coil 12 and the gap existing near the coil 12.

As described above, according to the third embodiment, since the coil 12 and the laminated yoke member 26 are molded integrally with the resin forming the holding member 29, the assembling workability and the mechanical strength are improved. It becomes possible to plan.

Embodiment 4 FIG. 10 is a cross-sectional view showing a configuration of a main part of a stator of a linear motor according to Embodiment 4 of the present invention. FIG. 11 is a rear view showing a configuration of a main part of a stator of the linear motor in FIG. FIG. 14 is a plan view showing an arrangement relationship between a stator and a mover of a linear motor according to Embodiment 4 of the present invention. In the figure, the same parts as those in each of the first to third embodiments are denoted by the same reference numerals, and description thereof will be omitted.

Numeral 30 is a plate-shaped core piece made of a magnetic material, and a recessed part for forming an articulated shape by rotatably fitting with the projection 30a at one end and the projection 30a of the core piece 30 adjacent to the other end. 30b is provided. Reference numeral 31 denotes a magnetic pole tooth formed to protrude outward from each core piece 30.
Each of the coils 12 is wound via an insulating bobbin 13. Reference numeral 32 denotes a core member formed by connecting a predetermined number of the core pieces 30 by fitting the respective protrusions 30a and recesses 30b, and reference numeral 33 denotes a stack of a predetermined number of the core members 32. And the like. As shown in FIG. 11, by sliding a predetermined amount of each fitting portion of each protruding portion 30a and concave portion 30b, each core piece 30 is formed into a core member. 32 are sequentially displaced in the laminating direction, and fixedly held by a holding member (not shown) to form the stator 34.

As described above, according to the fourth embodiment, by sliding each fitting portion of each protruding portion 30a and recessed portion 30b by a predetermined amount, each core piece 30 is attached to core member 32.
12, the skew is easily given by arranging the stator 34 at a predetermined angle α with respect to the mover 35 as shown in FIG. 12, for example. And the occurrence of cogging can be effectively suppressed.

Embodiment 5 FIG. FIG. 13 is a cross-sectional view showing a configuration of a main part of a stator of a linear motor according to Embodiment 5 of the present invention. FIG. 14 is a rear view showing a configuration of a main part of a stator of the linear motor in FIG. FIG. 15 is a plan view showing an arrangement relationship between a stator and a mover of a linear motor according to Embodiment 5 of the present invention. In the figure, the same parts as those in each of the first to fourth embodiments are denoted by the same reference numerals, and description thereof will be omitted.

Numeral 36 denotes a plate-shaped core piece made of a magnetic material and laminated by a predetermined number. Both upper and lower core pieces 36 are flexibly connected via a thin portion 36a as a connecting means. As shown in FIG. 14, by bending the thin portions 36a of the upper and lower core pieces 36 in the stacking direction, the core pieces 36 are sequentially shifted in the stacking direction, and are held by a holding member (not shown). The stator 37 is fixed and held.

According to the fifth embodiment, the thin portions 36a of the uppermost and lower core pieces 36 are bent in the stacking direction, so that the core pieces 36 are sequentially shifted in the stacking direction. For example, as shown in FIG. 15, the skew can be easily reduced by arranging the stator 37 at a predetermined angle α with respect to the mover 35 as shown in FIG. Can be given,
The occurrence of cogging can be effectively suppressed.

In each of the first to fifth embodiments, the configuration in which the winding is applied to the stator is described. However, the present invention is not limited to this, and the winding is applied to the mover. It goes without saying that the same effects as described above can be exerted even when applied to a configuration.

[0031]

As described above, according to the first aspect of the present invention, one of the stator and the mover is formed by arranging a plurality of core pieces each formed by projecting magnetic pole teeth outward. A laminated yoke member formed by laminating core members, connecting means for flexibly coupling at least a pair of edges of core pieces of the laminated yoke member, and wound around each magnetic pole taste of the laminated yoke member. With this configuration, it is possible to provide a linear motor that can be directly wound without lowering the winding density of the coil and that can be reduced in size and cost.

According to a second aspect of the present invention, in the first aspect, the connecting means is formed by forming opposing end faces of the respective core pieces of the core member into an articulated shape. By sliding the core pieces by a predetermined amount, the core pieces are sequentially shifted in the laminating direction of the core members, so that it is possible not only to reduce the size and reduce the cost but also to easily give the skew. Accordingly, it is possible to provide a linear motor capable of effectively suppressing the occurrence of cogging.

According to a third aspect of the present invention, in the first aspect, the connecting means comprises a thin portion formed to connect the respective core pieces of the core member, and each thin portion is folded. Since the respective core pieces are sequentially shifted in the laminating direction of the core members by being bent, it is possible not only to reduce the size and reduce the cost but also to easily provide skew and reduce cogging. A linear motor that can be effectively suppressed can be provided.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a dovetail groove or a protrusion that can be fitted into the dovetail groove is formed on a side of the core member different from the magnetic pole teeth. Therefore, it is possible to provide a linear motor capable of improving mechanical strength.

According to the fifth aspect of the present invention, a step of bending the connecting means to radially expand the tip of the magnetic pole teeth, and a step of winding the coil member around the expanded magnetic pole teeth; Since the method includes the step of returning the bent connecting means to the original state, it is possible to provide a method of manufacturing a linear motor that can be reduced in size and cost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a linear motor according to Embodiment 1 of the present invention.

2A and 2B show a configuration of a connecting means for connecting between core pieces of a laminated yoke member in FIG. 1, wherein FIG. 2A is a plan view and FIG.
FIG. 2 is a cross-sectional view showing a cross section along line AA in FIG.

FIG. 3 is a plan view showing a configuration of a stator in FIG.

FIG. 4 is a diagram for explaining a method of winding coils of a stator in FIG. 3;

FIG. 5 is a cross-sectional view showing a configuration of a main part of the linear motor according to Embodiment 1 of the present invention which is different from that shown in FIG. 1;

FIG. 6 is a cross-sectional view showing a configuration of a main part of the linear motor according to the first embodiment of the present invention, which is further different from that shown in FIG. 1;

FIG. 7 is a cross-sectional view illustrating a configuration of a stator of a linear motor according to a second embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a configuration of a stator of a linear motor according to a second embodiment of the present invention which is different from that shown in FIG. 7;

FIG. 9 is a cross-sectional view illustrating a configuration of a stator of a linear motor according to Embodiment 3 of the present invention.

FIG. 10 is a cross-sectional view showing a configuration of a main part of a stator of a linear motor according to Embodiment 4 of the present invention.

11 is a rear view showing a configuration of a main part of a stator of the linear motor in FIG. 10;

FIG. 12 is a plan view showing an arrangement relationship between a stator and a mover of a linear motor according to Embodiment 4 of the present invention.

FIG. 13 is a sectional view showing a configuration of a main part of a stator of a linear motor according to a fifth embodiment of the present invention.

FIG. 14 is a rear view showing a configuration of a main part of a stator of the linear motor in FIG. 13;

FIG. 15 is a plan view showing an arrangement relationship between a stator and a mover of a linear motor according to Embodiment 5 of the present invention.

FIG. 16 is a sectional view showing a configuration of a conventional linear motor.

FIG. 17 is a diagram showing a stator core of a conventional linear motor.
FIG. 7 is a plan view showing a configuration different from that shown in FIG.

FIG. 18 is a diagram of a stator core of a conventional linear motor.
FIG. 6 is a plan view showing a configuration further different from that shown in FIG.

FIG. 19 is a cross-sectional view showing a configuration of a linear motor using the stator core shown in FIG. 18;

[Explanation of symbols]

7, 22, 30, 36 core piece, 7a concave portion, 7b convex portion, 7c, 7d end face, 22a, 27b dovetail groove, 22
b, 27a projection, 30a projection, 30b depression,
36a Thin part, 8, 24, 31 Magnetic pole taste, 9
First core member, 10 Second core member, 11, 26
33 laminated yoke member, 12 coils, 13 insulating bobbin, 14, 27, 29 holding member, 15, 28, 34,
37 stator, 16, 35 mover, 18 winding machine, 1
9 Nozzle, 20 winding jig, 23, 36a thin part,
25, 32 core members.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Unno 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Inventor Masaya Inoue 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd. F term (reference) 5H641 BB06 BB18 BB19 GG02 GG03 GG04 GG08 GG11 GG12 GG17 HH02 HH03 HH08 HH10 HH12 HH13 HH14 HH16

Claims (5)

[Claims] 1. A laminated yoke member formed by laminating a core member formed by arranging a plurality of core pieces formed by projecting magnetic pole teeth outward in a strip shape on one of a stator and a mover. Connecting means for connecting at least a pair of edges of the core piece of the laminated yoke member to bendable,
A linear motor, comprising: a coil member wound around each magnetic pole taste of the laminated yoke member. 2. The connecting means is formed by forming opposing end faces of each core piece of the core member into an articulated shape, and sliding the articulated portion by a predetermined amount to connect each of the core pieces. 2. The linear motor according to claim 1, wherein the core members are sequentially shifted in a stacking direction of the core members. 3. The connecting means comprises a thin portion formed so as to connect the respective core pieces of the core member, and the respective core pieces are laminated by bending the respective thin portions. 2. The linear motor according to claim 1, wherein the linear motors are sequentially shifted in the direction. 4. The linear motor according to claim 1, wherein a dovetail groove or a protrusion that can be fitted in the dovetail groove is formed on a side of the core member different from the magnetic pole teeth. 5. A step of bending the connecting means to radially expand the tip of the magnetic pole teeth, a step of winding a coil member around the expanded magnetic pole teeth, and the step of bending the connecting means based on the bent connecting means. A method for manufacturing a linear motor, comprising a step of returning.