JP2010166705A - Coreless linear motor armature and coreless linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coreless linear motor armature, and a coreless linear motor, preventing coolant channel deformation and also preventing degradation in cooling performance, by suppressing occurrence of depositions due to flow of coolant in a gap in the coolant channel positioned between a mold resin and a can even if an attaching posture of a motor changes. <P>SOLUTION: In the coreless linear motor armature, a gap and the surface between coil trains constituting an armature winding 5 is filled with a mold resin 7. The mold resin 7 has a projection 11a which is formed to be a flow path throttling part for partially throttling the cross sectional area of the flow path toward the flow direction of coolant in a coolant channel 13, protruding from the surface of the mold resin 7 toward the inner wall of cans 2a and 2b into the gap positioned between the cans 2a and 2b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coreless linear motor for constant speed feed and high precision positioning that requires thrust ripple and low heat generation, and more particularly to its armature structure.

4 is a side sectional view of a coreless linear motor showing the prior art, and FIG. 5 is a perspective view of the coreless linear motor of FIG. 4 (see, for example, Patent Document 1). The conventional example will be described using an example of a moving coil linear motor having a magnetic flux penetrating structure in which field poles serving as stators are arranged on both sides of an armature constituting the mover.
In FIG. 4, 1 is an armature, 2a and 2b are cans, 3 is a frame, 4 is a base, 5 is an armature winding, 6 is a connection board, 7 is a mold resin, 8 is a field pole, and 9 is a field yoke. 10a and 10b are permanent magnets, and 13 is a refrigerant passage.
The field pole 8 is formed by arranging a plurality of permanent magnets 10a and 10b side by side in the direction perpendicular to the paper surface inside the both side surfaces of the field yoke 9 having a U-shaped cross section so that the polarities are alternately different. ing. The armature 1 is disposed so as to face the magnet rows of the permanent magnets 10a and 10b via a magnetic gap, and the armature winding 5 having a plurality of coil rows that are aligned and wound on the wiring board 6 is arranged. The gaps between the coil rows and the coil rows and the surface are filled with mold resin 7 and fixed. A coolant passage 13 is formed in a portion surrounded by the mold resin 7, the cans 2 a and 2 b and the frame 3.
In such a configuration, when the armature winding 1 of the linear motor is energized, the armature 1 to which the armature winding 5 is attached is linearly moved by the electromagnetic action of the magnetic flux of the armature 1 and the permanent magnets 10a and 10b. Moving. At this time, the surface of the coil row constituting the armature winding 5 is forcibly cooled by supplying the refrigerant into the refrigerant passage 13.

Japanese Patent No. 3832556

However, the conventional linear motor has the following problems.
(1) With the miniaturization of mechanical devices, diversification of the mounting posture of the linear motor is required, but in order to diversify the mounting posture, the cooling refrigerant is always placed in the refrigerant passage for any mounting posture. It is necessary to fill. In the conventional linear motor armature, since all the gaps between the mold resin covering the coil array and the can are a simple thin-walled space that forms the refrigerant passage, The flow cannot be constrained, for example, there is a problem that a gap does not flow (stagnation of the flow) when the mounting orientation of the motor changes, which causes a significant decrease in cooling performance. It was.
(2) As a measure for restraining the flow of the refrigerant, it is necessary to increase the number of parts of the motor. However, as the number of parts increases, the thermal conductivity of the motor increases because the heat conductivity deteriorates. There were problems such as an increase in heat generation.
(3) As a measure for uniformly filling the refrigerant in the refrigerant passage, measures such as increasing the flow rate of the refrigerant supplied into the refrigerant passage are required. However, if the refrigerant flow rate is increased, the pressure in the refrigerant passage is increased. As a result, the refrigerant passage is deformed and the refrigerant passage itself is destroyed due to interference with other members.
The present invention has been made in order to solve the above-described problem. Even if the mounting orientation of the motor changes, the occurrence of stagnation due to the flow of the refrigerant in the gap portion in the refrigerant passage located between the mold resin and the can. An object of the present invention is to provide a coreless linear motor armature and a coreless linear motor that can suppress, prevent deterioration of cooling performance, and prevent deformation of a refrigerant passage.

In order to solve the above-mentioned problem, the invention according to claim 1 includes an armature winding formed of a plurality of coil arrays, a can provided so as to cover the armature winding, the armature winding, and the In a coreless linear motor armature, which is formed between the cans and includes a refrigerant passage through which a refrigerant flows so as to forcibly cool the surface of the coil array, between the coil array and the coil array constituting the armature winding The mold resin is filled in the surface and the gap portion, and the mold resin protrudes from the mold resin surface toward the inner wall of the can in the gap portion located between the can and the flow of the refrigerant. It is characterized in that a projection serving as a flow path restricting portion that partially narrows the cross-sectional area of the flow path in the direction is formed.
According to a second aspect of the present invention, in the coreless linear motor armature according to the first aspect, the projections are located between adjacent coil groups of the armature winding in the plan view or in adjacent portions of the coil group. The refrigerant passage is characterized by having a flat channel cross-sectional shape that is long along the coil row in plan view.
According to a third aspect of the present invention, in the coreless linear motor armature according to the first or second aspect, the protrusion is made of the same material as the mold resin.
According to a fourth aspect of the present invention, in the coreless linear motor according to the first or second aspect, the protrusion is integrally formed with a mold resin.
According to a fifth aspect of the present invention, in the coreless linear motor armature according to the first or second aspect, the protrusion includes a rubber-based elastic body that is sandwiched and held between the can and the rubber-based linear motor armature. The elastic body is characterized by being a sealing member that compresses and deforms when the load is applied to the can and hermetically seals a gap between the protrusion and the can.
According to a sixth aspect of the present invention, there is provided the armature according to any one of the first to fifth aspects, and a plurality of permanent magnets which are arranged via the magnetic gap and the previous armature and are alternately different in polarity. It is characterized by a coreless linear motor that includes an arrayed field magnetic pole, and that is relatively driven by using one of the armature and the field magnetic pole as a stator and the other as a mover.

According to the first and second aspects of the present invention, the gap between the mold resin covering the coil array and the can protrudes from the surface of the mold resin toward the inner wall of the can and flows in the coolant flow direction. Protrusions that serve as flow passage restrictors that partially restrict the cross-sectional area of the road are provided, so that an arbitrary flow path can be created for the refrigerant inside the refrigerant passage. Since it can be arbitrarily controlled, it is possible to always fill the refrigerant passage with the refrigerant and to flow a constant refrigerant. As a result, even if the mounting orientation of the motor changes, the occurrence of stagnation due to the flow of the refrigerant in the gap in the refrigerant passage between the mold resin and the can is suppressed, preventing deterioration of the cooling performance and preventing the refrigerant passage from being deformed. can do.
According to the third aspect of the present invention, since the material of the projection is the same as that of the mold resin, the thermal expansion coefficient can be made the same, and the amount of thermal deformation is the same as the thermal deformation accompanying the temperature rise. It is possible to minimize the thermal stress applied to the film, and it becomes difficult for the protrusions to be peeled off, so that the reliability is improved.
According to the invention described in claim 4, since the projection can be manufactured simultaneously with the molding process for insulating and fixing the armature winding, the number of man-hours can be reduced, the workability can be improved, and the cost can be reduced. It becomes. In addition, since it is possible to always arrange the protrusions at the same position and size by the mold, it is possible to manage the flow of the refrigerant at a constant level, and to suppress the variation of the product with respect to the heat transfer, and the reliability is improved. improves.
According to the fifth aspect of the present invention, the contact between the protrusion and the can is not directly brought into contact with the rubber elastic body, so that the contact stress to the can caused by the variation in the height of the protrusion can be reduced with the elastic body. Since it can be escaped, the amount of deformation of the can can be suppressed, and interference with other parts due to the destruction or deformation of the can can be suppressed, thereby improving the reliability.
According to the sixth aspect of the present invention, it is possible to provide a coreless linear motor that can be mounted in any direction regardless of whether the motor is of a movable coil type or a movable magnet type.

Side sectional view of a linear motor showing an embodiment of the present invention The perspective view which showed the arrangement | positioning relationship of the molding resin and projection which cover the surface of the coil row | line | column in the linear motor armature of FIG. 2 is an enlarged side cross-sectional view of the portion where the elastic body is disposed between the protrusion and the can in the state in which the linear motor armature of FIG. 2 is shifted by 90 ° in the plane direction (direction A in FIG. 2). Side view of a linear motor showing the prior art 4 is a perspective view of the coreless linear motor of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view of a linear motor armature showing an embodiment of the present invention, and FIG. 2 is a perspective view showing an arrangement relationship between a mold resin and a projection covering the surface of a coil array in the linear motor armature of FIG. 1 and FIG. 2, the field pole is not shown. 3 is an enlarged side cross-sectional view of a portion where the elastic body is disposed between the protrusion and the can in the state in which the linear motor armature of FIG. 2 is shifted by 90 ° in the plane direction (direction of arrow A in FIG. 2). .
In the figure, 11a and 11b are protrusions provided on the mold resin, and 12 is a seal member.
In the present embodiment, an example of a moving coil type coreless linear motor having a magnetic flux penetrating structure in which field poles serving as stators are arranged on both sides of an armature constituting a mover is described. Therefore, the refrigerant passage 13 is constituted by the frame 3 and the cans 2a and 2b. The description of the components of the present invention that are the same as those of the prior art will be omitted, and only the differences will be described.

The present invention is different from the prior art as follows.
That is, the surface and the gap between the coil rows constituting the armature winding 5 are filled with the mold resin 7, and the mold resin 7 is a gap located between the cans 2a and 2b. A protrusion 11a that protrudes from the surface of the mold resin 7 toward the inner walls of the cans 2a and 2b and serves as a flow passage restricting portion that partially restricts the cross-sectional area of the flow passage in the refrigerant passage 13 in the refrigerant flow direction. 11b is formed.
Further, the projections 11a and 11b are formed between adjacent coil rows of the armature windings 5 in the plan view or along the adjacent portion of the coil row, and the refrigerant passage 13 is along the coil row in the plan view. It has a long and flat channel cross-sectional shape, and so-called protrusions 11a and 11b are arranged so as to be a labyrinth with respect to the refrigerant channel.
The protrusions 11a and 11b may be made of the same material as the mold resin or may be integrally formed with the mold resin.
The protrusions 11a and 11b include a rubber-based elastic body that is sandwiched and held between the cans 2a and 2b, and the rubber-based elastic body is compressed and deformed when a load is applied to the cans 2a and 2b. And the sealing member 12 which airtights the clearance gap between 11b and can 2a, 2b.

In the embodiment of the present invention, as shown in FIGS. 1 and 2, the protrusions are arranged on the mold resin 7, so that it is possible to control the flow path instead of the refrigerant path that has conventionally been difficult to control the flow path. Thus, the motor can be mounted to any mounting posture of the motor.
In addition, since the projections 11a and 11b are made of the same material as the mold resin and are integrally molded, the deformation and stress of the projection due to heat can be relieved, the reliability is improved, and the positioning is reproduced with high accuracy. Reliability can be improved because variations in thermal resistance can be suppressed.
In addition, the protrusions 11a and 11b and the cans 2a and 2b are not in direct contact with each other, and the elastic body is used so that the contact stress to the can caused by the variation in the height of the protrusions 11a and 11b can be reduced with the elastic body. Since it can be released, the deformation amount of the cans 2a and 2b can be suppressed, and interference with other parts due to the destruction and deformation of the cans 2a and 2b can be suppressed, so that the reliability is improved.

  In the present embodiment, description has been made using an example of a linear motor having a magnetic flux penetrating structure in which a field pole as a stator is arranged on both sides of an armature as a mover. As a stator, the gap opposing structure may be used instead of the gap facing structure, which is arranged on one side of the stator.

  As described above, since a linear motor that can be attached to an arbitrary attachment posture can be provided, it can be applied to a machine tool, a semiconductor manufacturing apparatus, a liquid crystal inspection apparatus, and the like that require downsizing of the apparatus.

DESCRIPTION OF SYMBOLS 1 Armature 2a, 2b Can 3 Frame 4 Base 5 Armature winding gland 6 Connection board 7 Mold resin 8 Field pole 9 Yoke 10a, 10b Permanent magnet 11a, 11b Protrusion 12 Elastic body (seal member)
13 Refrigerant passage

Claims (6)

An armature winding comprising a plurality of coil arrays;
A can provided to cover the armature winding;
A refrigerant passage formed between the armature winding and the can and flowing a refrigerant so as to forcibly cool the surface of the coil array;
In coreless linear motor armature with
The surface and the gap between the coil array and the coil array constituting the armature winding are filled with mold resin,
The mold resin protrudes from the surface of the mold resin toward the inner wall of the can in a gap located between the cans and partially restricts the flow path cross-sectional area in the refrigerant flow direction. A coreless linear motor armature, characterized in that a projection as a part is formed.   The projection is formed between adjacent coil rows of the armature winding in the plan view or along the adjacent portion of the coil row, and the refrigerant passage is a flat flow that is long along the coil row in the plan view. The coreless linear motor armature according to claim 1, wherein the coreless linear motor armature has a road cross-sectional shape.   The coreless linear motor armature according to claim 1, wherein the protrusion is made of the same material as the mold resin.   The coreless linear motor armature according to claim 1, wherein the protrusion is integrally formed with the mold resin.   The protrusion includes a rubber-based elastic body that is sandwiched and held between the can, and the rubber-based elastic body is compressed and deformed when a load is applied to the can, so that the protrusion is between the can and the can. 3. The coreless linear motor armature according to claim 1, wherein the coreless linear motor armature is a seal member that hermetically seals the gap. The armature according to any one of claims 1 to 5,
A magnetic field pole arranged with a plurality of permanent magnets alternately arranged in polarity with the previous armature and magnetic gaps,
A coreless linear motor that travels relatively with either one of the armature or the field magnetic pole as a stator and the other as a mover.

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