WO2004088827A1

WO2004088827A1 - Cooling structure for linear motor

Info

Publication number: WO2004088827A1
Application number: PCT/JP2004/004362
Authority: WO
Inventors: Yasuhiro Miyamoto; Takahisa Yamada
Original assignee: Kabushiki Kaisha Yaskawa Denki
Priority date: 2003-03-31
Filing date: 2004-03-26
Publication date: 2004-10-14
Also published as: JP2004304932A; TW200507416A; TWI272755B

Abstract

A cooling structure for a linear motor (4) comprising field system portions constituted of two field yokes (5) made from a magnetic body oppositely arranged on a stationary base (1) with vertical intervals and permanent magnets (6) having different magnetic poles alternating along the field yokes (5); armature portions constituted of armature cores (8) arranged parallel to the stationary base (1), between the field system portions with a gap in between, and armature coils (9) wound on the armature cores (8); an armature installation plate (7) provided above the armature portion and on which the armature portion is fixed; and a table (15) provided above the armature installation plate (7) and on which work is mounted, wherein an intermediate plate (12) is provided between the armature installation plate (7) and the table (15), and a cooling path (17) is provided inside the intermediate plate (12) and the armature installation plate (7) so as to be continuously folded in the moving direction of the armature portions.

Description

Linear motor cooling structure

[Technical field]

The present invention relates to a linear motor cooling structure capable of improving cooling performance without increasing generation loss of a motor, suppressing thermal deformation of a table, and suppressing an increase in the shape of a motor mover.

[Background technology]

Conventionally, a suction force canceling type linear motor that can freely move a table on which a work is mounted with respect to a fixed base is shown in Fig. 5. FIG. 5 is a front sectional view of a linear motor showing the first related art.

In FIG. 5, reference numeral 1 denotes a fixed base, 2 denotes guide rails provided on both right and left ends of the fixed base 1, and 3 denotes a slider that forms a linear guide in pairs with the guide rail 2. 4 is a linear motor, 5 is a plate-shaped field yoke fixed to the fixed base 1 so as to face each other in the vertical direction, and 6 is a field yoke 5 (in the direction perpendicular to the paper) that the magnetic poles are alternately different. A plurality of permanent magnets are provided, 7 is an armature mounting plate for fixing the armature, 8 is provided opposite to the permanent magnet 6 via a magnetic gap, and is made of an I-shaped silicon steel plate, for example. An armature core formed by laminating magnetic steel sheets in the height direction of the permanent magnets 6, and after laminating the cores, is formed by welding or bonding. Reference numeral 9 denotes an armature coil wound around the winding accommodating portion of each armature core 8. The field yoke 5 and the permanent magnet 6 constitute a stator (field section), and the armature core 8 and the armature coil 9 constitute a mover (armature section). In addition, the above-mentioned armature unit is configured such that, after winding the armature coil 9 in the winding accommodating portion of each armature core 8, each armature core 8 is sequentially connected along a predetermined straight path. This is a completed block-build armature.

In addition, 10 is provided at the lower part of the armature, and a connection board made of a glass epoxy material for facilitating the connection process of the crossover and the neutral point of the coil conductor constituting the armature coil, and 11 is A mold resin for fixing the armature coil 9 and the connection board 10, and 15 is a table provided on the armature fixing plate 7. The armature fixing plate 7 is secured by passing bolt screws 16 having male threads through the through holes 15a from the table 15 side, and then fixing the armature. It is screwed into the female screw 7 a provided on the plate 7 and fastened to the table 15. Then, the armature core 8 is screwed from the lower side of the armature core 8 into the female screw 7 b provided on the armature fixing plate 7 by passing the bolt screw 13 through the through hole 8 a and fastened to the armature fixing plate 7. Is done. The linear motor 4 is generally provided with an optical linear encoder composed of a linear scale and a sensor head in order to detect the position of the mover in the moving direction, but is not shown in FIG. I have.

In the linear motor 4 having such a configuration, when a current is applied to the armature coil 9 from a power source (not shown), the linear motor 4 generates a thrust along the longitudinal direction of the permanent magnet due to the electromagnetic action of the armature and the field. Perform a linear motion (see, for example, JP-A-2000-37070 and JP-A-2000-333432).

However, in the case of the reversing motor disclosed in JP-A-2000-37070 and JP-A-2000-333342, when the amount of heat generated by the coil conductor in the armature portion is increased by increasing the thrust of the motor, the armature coil 9 Most of the heat generated in the step is conducted to the table 15 via the armature core 8 and the armature mounting plate 7. The cooling performance of the linear motor 4 is limited because no cooling measures are taken, and the temperature of the table 15 rises due to the heat conduction from the armature coil 9 to cause thermal deformation, or the linear motor 4 is attached to the table 15. Also, there was a problem that the lower guide adversely affected a linear scale and the like (not shown), resulting in an error in the positioning accuracy of Table 15.

In order to solve the problems described in JP-A-2000-37070 and JP-A-2000-333432, for a linear motor having a block-build type armature, heat generated in the armature is efficiently cooled, In order to obtain high-accuracy positioning control characteristics, a recurring motor in which a cooling structure is added to the armature core itself has been proposed (for example, see JP-A-2001-128438).

FIG. 6 is a plan view of a linear motor showing a second related art, and shows an overall configuration of an armature and a cooling member mounted on a base plate.

In the figure, 30 is a linear motor armature, 31 is a base plate, 32 is an armature core, 33 is a coil, 34 is a flat cooling tube, 35 and 36 are a holder, and 37 is a folded member. The linear motor armature 30 includes a plurality of armature cores 32 each having an I-shaped electromagnetic steel sheet laminated thereon and a coil 33 wound around a concave portion thereof. The armature blocks are arranged and arranged, and a cooling member for cooling the armature blocks is continuously S-shaped from one end 34 a to the other end 34 b so as to sew the gap between the adjacent armature blocks. It is constituted by a flat cooling pipe 34 of a flat hollow shape, which is disposed in a folded state. In addition, both ends 34 a and 34 b of the elongate cooling pipe 34 are welded and connected to a first manifold 35 and a second manifold 36. The armature core 32 is fixed to the base plate 31 with bolt screws (not shown). As described above, the conventional cooling structure removes heat from the coil by flowing the refrigerant near the coil and transfers the coil to the outside of the motor. '

However, the cooling structure disclosed in Japanese Patent Application Laid-Open No. 2000-128384, which is the second prior art, has the following problems.

(1) The cooling performance of the armature is limited only by the flat cooling pipe near the coil, so the cooling performance is limited. In other words, part of the heat generated by the armature coil is transmitted to the armature core teeth on which the coil is wound, and is easily transferred to the armature mounting plate and the table. Was adversely affected.

(2) Since the flat cooling pipe is located in the space where the armature coil is arranged, there is a problem that the space factor of the conductor is sacrificed, and the generation loss of the motor is increased.

(3) The flat cooling pipe has a wavy shape as shown in the figure, and is arranged so as to sew between the coils.Therefore, the mover of the return motor is provided by the presence of the refrigerant pipe further outside both ends of the coil end. The shape (width dimension) was to be increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is an object of the present invention to improve cooling performance without increasing motor generation loss, suppress thermal deformation of a table, and suppress an increase in motor mover shape. It is an object of the present invention to provide a cooling structure for a reversible motor that can perform the cooling operation.

[Disclosure of the Invention]

• In order to solve the above problem, the invention according to the cooling structure for a linear motor according to claim 1 is characterized in that two field yokes made of magnetic materials are disposed on a fixed base and are vertically opposed to each other. And a field part comprising a plurality of permanent magnets having different magnetic poles alternately along the field yoke; an armature core and an armature core arranged in parallel with the fixed base via a gap between the field parts; An armature portion comprising an armature coil wound around the armature; A linear motor, comprising: an armature mounting plate provided on an upper portion of the mounting plate for fixing the armature portion; and a table provided on the upper portion of the armature portion for mounting a work. An intermediate plate is provided between the armature mounting plate and the table, and is disposed inside the intermediate plate and the armature mounting plate so as to be continuously folded in the moving direction of the armature portion. A cooling passage is provided.

According to a second aspect of the present invention, in the cooling structure for a linear motor according to the first aspect, the refrigerant flowing through the cooling passage flows from the intermediate plate and is discharged from the armature mounting plate. It is.

According to a third aspect of the present invention, in the cooling structure for a linear motor according to the first or second aspect, the cooling passage is formed of a copper cooling pipe.

According to a fourth aspect of the present invention, in the cooling structure for a linear motor according to any one of the first to third aspects, the table, the intermediate plate, and the armature mounting plate are integrally fastened by a Bonoleto screw. is there.

According to a fifth aspect of the present invention, in the cooling structure for a linear motor according to any one of the first to fourth aspects, the intermediate plate and the armature mounting plate have a refrigerant inlet, a seventh medium outlet, and the intermediate medium. A joint for connecting a refrigerant outlet of the plate and a refrigerant inlet of the armature mounting plate is provided. .

[Brief description of drawings]

FIG. 1 is a front sectional view of a linear motor showing an embodiment of the present invention, and FIG. 2 is a side view of a luer motor mover of FIG. 1. In FIG. The cross section along the line A is broken, Bonoreto 21 and 22 are the cross sections along the line BB and C-C in Figure 1, respectively.Figure 3 shows the refrigerant passage in the linear motor mover. FIG. 4 is a front view showing a state in which inlet and outlet joints are connected, FIG. 4 is a schematic view for explaining the flow of refrigerant in the refrigerant passage in the present embodiment, and FIG. 5 is a linear motor showing the first prior art. FIG. 6 is a plan view of a linear motor showing a second conventional technique, and shows an overall configuration of an armature mounted on a base plate and a cooling member.

[Best Mode for Carrying Out the Invention]

[First Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a front sectional view of a linear motor showing an embodiment of the present invention. FIG. 2 is a side view of the linear motor mover of FIG. 1, in which the refrigerant passage 17 has a cross-section taken along line A--A in FIG. 1, and the bolts 21 and 22 have The cross-sections along the lines B-B and 'C-C in Fig. 1 are broken. FIG. 3 is a front view showing a state in which the joints at the inlet and outlet of the refrigerant passage in the linear motor mover are connected. The same components as those of the related art are denoted by the same reference numerals and the description thereof will be omitted, and only different points will be described.

1 and 2, reference numeral 12 denotes an intermediate plate, and reference numeral 17 denotes a cooling passage. In FIG. 3, 17 a is a refrigerant inlet of the refrigerant passage 17 provided in the intermediate plate 12, 17 b is a refrigerant outlet of the intermediate plate 12 side, and 17 c is provided in the armature mounting plate 7. A refrigerant inlet of the refrigerant passage 17, 17 d is a refrigerant outlet on the armature mounting plate 7 side, and 23 is a joint. The differences between the present invention and the prior art are as follows.

That is, the intermediate plate 12 is provided between the armature mounting plate 7 and the table 15 and is continuously folded inside the intermediate plate 12 and the armature mounting plate 7 in the moving direction of the armature portion. A cooling passage 17 is provided.

Further, the refrigerant flowing into the cooling passage 17 flows into the intermediate plate 12 and is discharged from the armature mounting plate 7.

The cooling passage 1 mm is made up of a copper cooling pipe.

Further, the table 15, the intermediate plate 12 and the armature mounting plate 7 are fastened to the body by bolt screws 21 and 22. The armature mounting plate 7 is provided with female screws 7a.Bolt screws 21 and 22 are screwed into each female screw 7a, and the table 15, intermediate plate 12 and armature mounting plate 7 are integrated. You.

Further, the refrigerant inlet 17 b of the intermediate plate 12 and the refrigerant inlet 17 c of the armature mounting plate 7 are connected to the refrigerant inlet and the refrigerant outlet of the intermediate plate 12 and the armature mounting plate 7. Joints 23 are provided.

Next, the operation will be described.

FIG. 4 is a schematic diagram for explaining the flow of the refrigerant in the refrigerant passage in this embodiment. In the figure, the refrigerant inlets 17a, 17c, 17b, 17d are circled. The part enclosed by is shown.

First, when the refrigerant flows into the refrigerant inlet 17a of the intermediate plate 12 from an external refrigerant supply source (not shown), the refrigerant cools the intermediate plate 12 and then flows out of the refrigerant outlet 17b. Next, the refrigerant flowing out from the refrigerant outlet 17b enters the refrigerant inlet 17c of the armature mounting plate 7, cools the armature mounting plate 7, and flows out from the refrigerant outlet 17d. As described above, after the intermediate plate 12 is first cooled by the refrigerant, the armature mounting plate 7 is cooled later.

Therefore, in the embodiment of the present invention, the intermediate plate 12 is provided between the armature mounting plate 7 and the table 15, and the armature portion is provided inside the intermediate plate 12 and inside the armature mounting plate 7. Since the cooling passages 17 are provided so as to be continuously folded in the moving direction, heat generated by the armature coil 9 of the linear motor is cooled by the cooling passages provided in the intermediate plate 12 and the armature mounting plate 7, respectively. The refrigerant is removed by flowing the refrigerant through the cooling medium 17, thereby improving the cooling performance without increasing the generation loss of the motor and suppressing the thermal deformation of the table 15. As a result, it is possible to minimize the influence of deterioration in accuracy due to thermal deformation due to the temperature rise in Table 15. In addition, the linear guide attached to the table 15 ゃ can maintain good positioning accuracy of the table 15 without adversely affecting a linear scale (not shown).

Furthermore, since the refrigerant flowing through the cooling passage 17 flows from the intermediate plate 12 and is discharged from the armature mounting plate 7, the intermediate plate 12 having a small heat exchange amount by the refrigerant is cooled first. By cooling the armature mounting plate 7, which has a greater amount of heat exchange with the refrigerant than the intermediate plate 12 later, the temperature rise due to the heat exchange of the refrigerant in the intermediate plate 12 that directly contacts the table 15 is minimized. Can be suppressed. Further, since the cooling passage 17 is formed of a copper cooling pipe, the danger of electrolytic corrosion can be eliminated even when water is used as the refrigerant.

Since the table 15, the intermediate plate 12 and the armature mounting plate 7 are integrally fastened by the bolt screws 21 and 22, the contact thermal resistance between each member can be improved, and the heat generated in the armature portion The generated heat can be effectively radiated to the cooling passage 17.

Then, the refrigerant inlet and outlet of the intermediate plate 12 and the armature mounting plate 7 are Since the joint for connecting the refrigerant inlet and the outlet is provided, the connection structure of the refrigerant inlet and the outlet of the intermediate plate 12 and the armature mounting plate 7 can be made compact and simple.

[Industrial applicability]

INDUSTRIAL APPLICABILITY As described above, the present invention relates to a linear motor cooling structure, and is particularly useful as a cooling structure for a linear motor mover having a magnetic attraction force canceling structure.

Claims

The scope of the claims

1. Two field yokes made of a magnetic material and arranged opposite to each other in the vertical direction on a fixed base and a plurality of permanent magnets having different magnetic poles along the field yoke alternately. Department and the '

An armature core including an armature core disposed in parallel with the fixed base via an air gap between the field portions, and an armature coil wound on the armature core;

A linear motor provided on an upper portion of the armature portion and fixing the armature portion; and a table provided on the upper portion of the armature mounting plate for mounting a work. At

An intermediate plate is provided between the armature mounting plate and the table,

A cooling structure for a linear motor, wherein cooling passages are provided inside the intermediate plate and inside the armature mounting plate so as to be continuously folded back in the moving direction of the armature portion. .

2. The cooling of the linear motor according to claim 1, wherein the refrigerant flowing through the cooling passage flows from the intermediate plate and is discharged from the armature mounting plate.

3. The cooling structure for a linear motor according to claim 1, wherein the cooling passage is formed of a copper cooling pipe.

4. The cooling structure for a linear motor according to any one of claims 1 to 3, wherein the table, the intermediate plate, and the armature mounting plate are integrally fastened by bolt screws.

5. The refrigerant inlet and the refrigerant outlet of the intermediate plate and the armature mounting plate are provided with joints for connecting the refrigerant outlet of the intermediate plate and the refrigerant inlet of the armature mounting plate. The cooling structure for a linear motor according to any one of claims 1 to 4.