JP2023049591A - Coreless linear motor, and mover - Google Patents

Abstract

To provide a small-sized coreless linear motor which utilizes a gap in a center of a coreless coil, and has a cooling performance.SOLUTION: A coreless linear motor 1 has a stator 2 and a mover 3 moved in a longitudinal direction of the stator 2, wherein the mover 3 has a coreless coil 32 in which a gap part 33 is provided in a center of a wound coil, and a resin-made coil mold part 30 where the coreless coil 32 is embedded, and a heat radiation part 84 integral with the coil mold part 30 is provided in the gap part 33.SELECTED DRAWING: Figure 2

Description

The present invention relates to a coreless linear motor and a mover.

A coreless linear motor is basically composed of a stator having permanent magnets and a mover having coils. A coreless linear motor generally has a form in which a mover is movably inserted into a groove of a U-shaped stator.

A coreless linear motor generally tends to increase the current flowing through the coils in order to increase the speed of the conveying device. As a result, the amount of heat generated by the coil unit increases, and there is a risk of thermal deformation of the peripheral members.

Patent Literature 1 discloses a linear motor having cooling fins on the surface of a coil unit in order to efficiently release heat generated from the coil unit. Patent Literature 2 discloses a linear motor having through holes in the periphery of the coil unit in order to efficiently release heat generated from the coil unit.

JP 2020-174422 A Japanese Patent No. 6677048

However, in the case of a linear motor using a coreless coil, the cooling fins disclosed in Cited Document 1 and the through holes disclosed in Cited Document 2 cannot effectively utilize the gap in the center of the coreless coil, which is a dead space. Therefore, it is difficult to miniaturize a coreless linear motor with cooling performance.

An object of the present invention is to provide a compact coreless linear motor with cooling performance.

A coreless linear motor according to one aspect of the present invention includes:
A coreless linear motor having a stator and a mover that moves in the longitudinal direction of the stator,
The mover has a coreless coil in which a gap is provided in the center of the wound winding, and a resin coil mold part in which the coreless coil is embedded,
A heat radiating portion integrated with the coil mold portion is provided in the gap portion.

Further, the mover according to one aspect of the present invention is
A mover that moves in the longitudinal direction of a coreless linear motor,
a coreless coil in which a gap is provided in the center of the wound winding;
Having a resin coil mold part in which the coreless coil is embedded,
A heat radiating portion integrated with the coil mold portion is provided in the gap portion.

According to the present invention, it is possible to provide a compact coreless linear motor with cooling performance by effectively utilizing the central gap of the coreless coil.

1 is a perspective view of a coreless linear motor according to an embodiment of the invention; FIG. It is a perspective view which shows the mover of a coreless linear motor. FIG. 4 is a front view of a coil mold portion that constitutes the mover; 4 is a cross-sectional perspective view taken along line BB of FIG. 3; FIG. 4 is a cross-sectional perspective view of FIG. 3 taken along line BB of FIG. 3, according to another embodiment; FIG. It is a figure explaining the manufacturing process of a coil mold part.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. For the sake of convenience, descriptions of members having the same reference numbers as members already described in the description of the embodiment will be omitted. Also, the dimensions of each member shown in this drawing may differ from the actual dimensions of each member for convenience of explanation.

FIG. 1 is a perspective view showing an example of a coreless linear motor according to an embodiment of the invention.
As shown in FIG. 1 , the coreless linear motor 1 includes a stator 2 and a mover 3 that is relatively movable with respect to the stator 2 .

The stator 2 has a yoke 21 and permanent magnets 22 attached to the yoke 21 . The yoke 21 is composed of a pair of side plate yokes 21a and 21b formed in a flat plate shape and a bottom plate yoke 21c connecting the pair of side plate yokes 21a and 21b. The yoke 21 is made of a metal material such as iron. The pair of side plate yokes 21a and 21b are arranged to face each other. The side plate yokes 21a and 21b are connected by a bottom plate yoke 21c at one ends in a direction perpendicular to the longitudinal direction of the stator 2 (direction indicated by arrow A in FIG. 1). The side plate yokes 21a and 21b and the bottom plate yoke 21c are fixed with bolts 23, for example. A groove extending in the longitudinal direction A is formed between the side plate yokes 21a, 21b and the bottom plate yoke 21c by connecting the side plate yokes 21a, 21b and the bottom plate yoke 21c. The yoke 21 is configured such that its shape when viewed along the longitudinal direction A is substantially U-shaped.

A permanent magnet 22 is attached to each of the opposing surfaces of the side plate yokes 21a and 21b. The permanent magnet 22 has a permanent magnet 22a and a permanent magnet 22b with different polarities. The permanent magnets 22a and 22b are formed in the shape of elongated flat plates extending from the bottom plate yoke 21c in a direction perpendicular to the longitudinal direction A along the side plate yokes 21a and 21b. The permanent magnets 22a and 22b are arranged side by side in the longitudinal direction A on the opposing surfaces of the side plate yokes 21a and 21b. The permanent magnets 22a and 22b are attached to the side plate yokes 21a and 21b with their ends on the side of the bottom plate yoke 21c separated from the bottom plate yoke 21c by a predetermined distance. Therefore, there are regions where the permanent magnets 22a and 22b are not provided on the bottom plate yoke 21c side of the side plate yokes 21a and 21b.

The permanent magnets 22a and 22b are arranged such that adjacent magnets have different polarities and opposing magnets also have different polarities. That is, as shown in FIG. 1, for example, a permanent magnet 22a having an N pole and a permanent magnet 22b having an S pole are arranged so as to be adjacent to each other and face each other. The mover 3 moves along the longitudinal direction A in the groove 24 between the side plate yokes 21a and 21b to which the permanent magnets 22a and 22b are attached. The distance between the opposing permanent magnets 22a and 22b (the width of the groove 24a) is configured to be slightly larger than the thickness of the coil mold portion 30 of the mover 3 that moves within the groove 24. As shown in FIG. The space between the side plate yokes 21a and 21b (the width of the groove portion 24b) in the area where the permanent magnets 22a and 22b are not provided on the side of the bottom plate yoke 21c of the side plate yokes 21a and 21b is equal to the thickness of the permanent magnets 22a and 22b. It is configured to be larger than the groove portion 24a.

FIG. 2 is a perspective view showing the mover 3. FIG.
As shown in FIG. 2 , the mover 3 has a coil mold portion 30 , a connection portion decorative plate 50 , a power line cable 60 and a heat radiating portion 35 .

The coil mold portion 30 is a plate-like member in which a plurality of coils are integrally molded with resin, and has a pair of facing surfaces 37 and 38 that face the permanent magnets 22 of the stator 2 .
The connection section decorative plate 50 is attached to one (upper in FIG. 2) end of the coil mold section 30 in a direction perpendicular to the longitudinal direction A (vertical direction in FIG. 2).

The power line cable 60 is provided so as to protrude from the connection section decorative plate 50 . The power line cable 60 is a cable that supplies electric power to the coil of the coil mold portion 30 . A circuit connection leading to the coil of the coil mold portion 30 is connected to the power line cable 60 . A circuit wire connected to the coil of the coil mold portion 30 is accommodated in a space formed by the wire connection portion decorative plate 50 .

The heat radiating portion 35 is formed integrally with the coil mold portion 30 by providing a thin plate-like resin in the shape of a fence.

In the mover 3, the portion of the coil mold portion 30 to which the connection portion decorative plate 50 is not attached is arranged in the groove portion 24 of the stator 2, and the portion of the coil mold portion 30 to which the connection portion decorative plate 50 is attached is It is arranged outside the grooves 24 of the stator 2 (see FIG. 1).

FIG. 3 is a front view of the coil mold section 30. FIG. 4 is a cross-sectional perspective view taken along line BB of FIG. 3. FIG.
As shown in FIGS. 3 and 4, the coil mold portion 30 is a rectangular plate-like member in which a plurality of (three in the illustrated example) coils arranged in parallel are molded with a resin portion 31. It has a plurality of heat radiating portions 35a, 35b, 35c. The coils are composed of coreless coils 32 a , 32 b , 32 c having gaps 33 . The three coreless coils 32a, 32b, 32c are arranged along the moving direction of the mover 3 (the same direction as the longitudinal direction A), and the heat radiating portions 35a, 35b, 35c are arranged in the respective gaps 33. It is In the illustrated example, the three coreless coils 32a, 32b, 32c are composed of a U-phase coil, a V-phase coil, and a W-phase coil. The resin portion 31 for molding the coreless coils 32a, 32b, 32c is also poured into the gaps 33 of the coreless coils 32a, 32b, 32c to form the heat radiating portions 35a, 35b, 35c.

The heat radiating portions 35a, 35b, 35c have a pair of heat radiating base portions 35Ba, 35Bb, 35Bc located at both ends in a direction Y perpendicular to the longitudinal direction A, and heat radiating fins 35Fa, 35Fb, 35Fc extending in the direction Y. . The radiating fins 35Fa, 35Fb, 35Fc extend from one facing surface 37 to the other facing surface 38, and the slit portions, which are the space portions of the respective radiating fins 35Fa, 35Fb, 35Fc, extend from the one facing surface 37 to the other facing surface 38. It penetrates to the facing surface 38 of . By thus forming the heat radiation portions 35a, 35b, 35c in the gaps 33 of the respective coreless coils 32a, 32b, 32c, a uniform cooling effect can be obtained for the entire mover.

Next, a manufacturing process of the coil mold portion 30 will be described with reference to FIG.
In step S1 of FIG. 6, the first movable mold 80 for manufacturing the coil mold portion 30 is prepared. A concave portion 81 having a size corresponding to the coil mold portion 30 is formed in the first movable mold 80 . The depth of the concave portion 81 is formed to be approximately half the thickness of the coil mold portion 30 . Positioning blocks 82a, 82b, 82c are provided in the recess 81 for positioning the coreless coils 32a, 32b, 32c to be molded. The positioning blocks 82a, 82b, 82c are recessed with a thickness H such that the length L corresponds to the length of the gap 33 of the coreless coils 32a, 32b, 32c, and the width W corresponds to the width of the gap 32. It is formed so as to have the same depth as that of 81 and approximately half the thickness of the coreless coils 32a, 32b, and 32c. A positioning hole 83 for positioning the first movable mold 80 is provided in the recess 81 .

At step S2 in FIG. 6, the coreless coils 32a, 32b, and 32c are set on the first movable mold 80. As shown in FIG. The coreless coils 32 a , 32 b , 32 c are set by fitting the positioning blocks 82 a , 82 b , 82 c of the first movable mold 80 into the gap 32 .

At step S3 in FIG. 6, a stationary mold 90 for manufacturing the coil mold portion 30 is prepared. A recess 91 having a size corresponding to the coil mold portion 30 is formed in the fixed mold 90 . The depth of the concave portion 91 is formed to be slightly deeper than half the thickness of the coil mold portion 30 . In the concave portion 91, a plurality of fence-like blocks 84a, 84b, 84c for forming the heat radiating portions 35a, 35b, 35c, positioning pins for determining the position of the fixed mold 90 with respect to the first movable mold 80 92 are provided. The heights of the plurality of fence-shaped blocks 84a, 84b, and 84c are substantially the same as the depth of the concave portion 91, and are set so as to form a slit portion penetrating the one facing surface 37. As shown in FIG. The positioning pin 92 is provided so as to correspond to the positioning hole 83 of the first movable mold 80 .

At step S4 in FIG. 6, the stationary mold 90 is attached to the first movable mold 80 on which the coreless coils 32a, 32b, and 32c are set. The fixed mold 90 is attached to the first movable mold 80 by fitting the positioning pins 92 of the fixed mold 90 into the positioning holes 83 of the first movable mold 80 . After attaching the fixed mold 90 to the first movable mold 80, the first resin molding is performed. By the first resin molding, the half-thickness portions of the coreless coils 32a, 32b, and 32c on the fixed mold 90 side are molded with resin.

At step S5 in FIG. 6, the first movable mold 80 is removed from the fixed mold 90 after the first resin molding. Slits 93 corresponding to the positioning blocks 82a, 82b, 82c of the first movable mold 80 are formed in the gaps 32 of the coreless coils 32a, 32b, 32c.

In step S6 of FIG. 6, the second movable mold 85 for manufacturing the coil mold portion 30 is prepared. A concave portion 86 having a size corresponding to the coil mold portion 30 is formed in the second movable mold 85 . The depth of the concave portion 86 is formed to be slightly deeper than half the thickness of the coil mold portion 30 . A plurality of fence-like blocks 88 a , 88 b , 88 c for forming the heat radiating portions 35 a , 35 b , 35 c and a positioning hole 87 for determining the position of the second movable mold 85 are provided in the recess 81 . The height of the plurality of fence-like blocks 88a, 88b, 88c is substantially the same as the sum of the depth of the recess 86 and the depth of the recess 91. set to be formed.

In step S7 of FIG. 6, the second movable mold 85 is attached to the fixed mold 90 to which the coreless coils 32a, 32b, and 32c are attached. The second movable mold 85 is attached to the fixed mold 90 by fitting the positioning pins 92 of the fixed mold 90 into the positioning holes 87 of the second movable mold 85 . After attaching the fixed mold 90 to the second movable mold 85, the second resin molding is performed. By the second resin molding, half the thickness of the coreless coils 32a, 32b, and 32c on the side of the second movable mold 85 is molded with resin.

In step S8 in FIG. 6, the fixed mold 90 and the second movable mold 85 are removed after the second resin molding. Radiation fins 35Fa, 35Fb, and 35Fc extending from one facing surface 37 to the other facing surface 38 are formed by forming the slit portions of the heat dissipating portions 35a, 35b, and 35c.
The coil mold portion 30 is formed with a positioning hole 34a and a bolt hole 34b formed by fitting the positioning pin 92 of the fixed mold 90 thereinto.
Since the heat radiation portions 35 a , 35 b , 35 c do not protrude from the pair of facing surfaces 37 , 38 , they do not block the flow of air between the coil mold portion 30 and the magnet rails of the stator 2 . Since the ends of the radiation fins 35Fa, 35Fb, and 35Fc face the air flow path, the cooling effect can be improved.

In the above-described embodiment, the radiation fins 35Fa, 35Fb, and 35Fc are configured to extend in the direction Y perpendicular to the longitudinal direction A, but may be configured to extend in the longitudinal direction A. Further, the radiation fins 35Fa, 35Fb, and 35Fc have slits penetrating from one facing surface 37 to the other facing surface 38. As shown in FIG. A plate-like central base portion 35Ca, 35Cb, 35Cc may be provided on an intermediate plane with the opposing surface 38, and a non-penetrating slit may be provided from one opposing surface 37 to the other opposing surface 38. FIG.

Although the embodiments of the present invention have been described above, it goes without saying that the technical scope of the present invention should not be limitedly interpreted by the description of the embodiments. It should be understood by those skilled in the art that this embodiment is merely an example, and that various modifications of the embodiment are possible within the scope of the invention described in the claims. The technical scope of the present invention should be determined based on the scope of the invention described in the claims and their equivalents.

1 coreless linear motor 2 stator 3 mover 21 yokes 21a, 21b side plate yoke 21c bottom plate yoke 22 (22a, 22b) permanent magnets 23, 41, 51, 71 bolts 24 (24a, 24b) groove portion 30 coil mold portion 31 resin portion 32a, 32b, 32c coreless coil 33 (33a, 33b, 33c) air gap 35 (35a, 35b, 35c) heat dissipation parts 35Ba, 35Bb, 35Bc heat dissipation base parts 35Fa, 35Fb, 35Fc heat dissipation fins 37, 38 facing surface 50 connection part Decorative plate 60 Power line cables 84a, 84b, 84c Fence-like blocks 88a, 88b, 88c Fence-like blocks

Claims (11)

A coreless linear motor having a stator and a mover that moves in the longitudinal direction of the stator,
The mover has a coreless coil in which a gap is provided in the center of the wound winding, and a resin coil mold part in which the coreless coil is embedded,
A coreless linear motor, wherein a heat radiating portion integrated with the coil mold portion is provided in the air gap portion. The coil mold section has a plurality of the coreless coils,
The heat dissipation part is provided in the gap part of each of the coreless coils,
The coreless linear motor according to claim 1. The coil mold portion has a pair of opposing surfaces facing each magnet portion of the stator,
3. The coreless linear motor according to claim 1, wherein said heat radiating portion does not protrude from said pair of opposing surfaces. The heat dissipation part has a plurality of fins,
4. The coreless linear motor according to any one of claims 1 to 3, wherein slits are provided between said fins adjacent to each other. The coil mold portion has a pair of opposing surfaces facing each magnet portion of the stator,
5. The coreless linear motor according to claim 4, wherein said slit penetrates said pair of opposing surfaces. 3. The coreless linear motor according to claim 1, wherein said heat radiating portion has a base portion extending in said longitudinal direction and fins projecting from said base portion. 3. The coreless linear motor according to claim 1, wherein said heat radiating portion has fins extending in said longitudinal direction. 3. The coreless linear motor according to claim 1, wherein said heat radiating portion extends in a direction orthogonal to said longitudinal direction. 7. The coreless linear motor according to any one of claims 4 to 6, wherein said heat radiating section has a plurality of fins extending parallel to each other. The coreless linear motor according to any one of claims 1 to 8, wherein the heat radiating section is integrally molded with the same resin material as the coil mold section. A mover that moves in the longitudinal direction of a coreless linear motor,
a coreless coil in which a gap is provided in the center of the wound winding;
Having a resin coil mold part in which the coreless coil is embedded,
A mover, wherein a heat radiating portion integrated with the coil mold portion is provided in the gap portion.

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