CN1787342B - A linear motor cooler - Google Patents

Abstract

The invention belongs to the technical field of linear motor cooling, and is characterized in that the cooler is an integral or split type wall-attached cooler, and the inner wall of the cooler has a cooling circuit for the directional flow and communication of the cooling liquid. The cooling water tank is composed of a cooling water tank and a cooling water tank cover. The cooling water tank is nested on the surface of the linear motor core laminations and coils to complete the cooling of the linear motor. The gap between the cooling water tank and the linear motor core laminations and coils is filled with Filler with good thermal conductivity. The invention has the advantages of high cooling efficiency, simple manufacture, good manufacturability, easy assembly and disassembly, compact structure and the like.

Description

A linear motor cooler

technical field

The invention relates to a linear motor with linear motion and a cooling system aiming at the unique appearance characteristics of the linear motor.

Background technique

The linear motor cancels the intermediate transmission link between the power source and the workbench, and directly produces high-speed motion and large thrust. Compared with the rotary motor, the linear motor is more likely to generate high heat, and the temperature rise of the linear motor will directly affect its quick response. , limit its maximum rated thrust, and change the working point of the permanent magnet. And because the linear motor directly drives the movement of the workbench, its strong magnetic field will absorb a large amount of magnetic dust. In order to prevent the intrusion of dust, the linear motor is often sealed, so its heat dissipation conditions are even worse, and natural convection cooling by air is far from possible. To meet the working requirements of large-thrust linear motors, it is extremely important and urgent to develop an efficient cooling system to reduce the operating temperature of linear motors.

At present, the research on permanent magnet synchronous linear motor coolers for machine tools is still one of the few cases in China. There are two main foreign representative cooling methods for direct cooling of the primary motor:

1), line contact cooling method. See European Patent Office patent DE19604643, 1997-08-14, SCHWARZ GERD (DE). Since the cooling pipe is in line contact with the iron core, the cooling contact area is greatly limited, which greatly limits the cooling efficiency of the cooling system.

2), extended line contact cooling method. See European Patent Office Patent, JP11252863, 1999-09-17, TAKEUCHIKATSUHIKO; WAKAZONO YOSHIO; IMANISHI KOZO.

These two typical cooling methods do not make the most and full use of the outer surface area of the motor, and have the disadvantage of complicated assembly process.

Contents of the invention

The object of the present invention is to provide a linear motor liquid cooler with simple manufacture, good manufacturability, easy installation and disassembly, compact structure and high cooling efficiency.

The feature of the present invention is that the cooler is an integral wall-attached cooler, which is made of a cooling water box directly nested and fixed on the linear motor body, a cooling water tank cover fixedly connected with the cooler, and a It is composed of various cooling circuits on the inner surface of the cooling water box for the directional flow and communication of the cooling liquid. Fillers with good thermal conductivity are filled between the cooling water box body and the iron core laminations and coils of the linear motor body. At the bottom of the cooling water box, a cavity for nesting the iron core laminations and coils of the linear motor is formed at the bottom of the cooling water box according to the shape of the linear motor iron core laminations and coil body . The cooling circuit is distributed on the top and side of the cooling water box.

The present invention is also characterized in that the cooler is a split-type wall-attached cooler, consisting of a plurality of cooling water tanks communicated with cooling pipes and cooling water tank covers fixedly connected to each of the cooling water tanks. Each of the cooling water boxes is directly installed on each part of the linear motor body, and the inner surface of each cooling water box is made for the directional flow of the cooling liquid and the cooling pipes located between the cooling water boxes Various cooling circuits connected. The cooling water tanks and the laminated iron core and coil of the linear motor body are filled with fillers with good thermal conductivity. At the bottom of the cooler, according to the core of each part of the linear motor The shape of the laminations and the coil body forms a cavity for nesting the iron core laminations and coils of the linear motor. The cooling circuits are distributed on the top and sides of the cooling water boxes.

According to the present invention, the water tank of the cooler tightly surrounds the iron core laminations 8 and coils 11 of the linear motor as a box, and the heat generated by the linear motor iron core laminations 8 and coils 11 passes through the cooling liquid in the surrounding cooling water tank to the maximum extent. Take away, see Figure 3.

The primary surface area of the motor involved in the present invention is 0.46m ² , and the actual cooling area of the motor is 0.28m ² , which is about 61%. All are cooled to.

Experimental data: The stall temperature rise test is carried out under the rated state of the motor, that is, the rated current is 28.2A, the corresponding output state is 3000N, and the maximum stable temperature of the motor is 66°C, which satisfies the working state of the high-thrust permanent magnet synchronous linear motor. needs.

Description of drawings

Figure 1 Front view of the integral cooler;

Figure 2 Bottom view of the integral cooler;

Figure 3 A-A sectional view of the integral cooler;

Figure 4 Upper and end cooling water tanks (symmetrical 1/4 model);

Fig. 5 upper part, end part and side cooling water tank (symmetrical 1/4 model);

Figure 6 is a longitudinal sectional view of the present invention.

Part Number Description

1-base

2-Secondary magnet

3- cover plate

4-soft iron pad

5- grating connecting plate

6- Grating ruler protective case

7-Cooler cooling water tank

7A-upper cooling water tank

7C-end cooling water tank

7E-side cooling water tank

8-core laminations

9-Cooler cooling water tank cover

10-Coupling bolts

11-coil

12- Thermally conductive filler

13a-Coolant inlet

13b-Coolant outlet

14-rail

15- grating reading head

16- grating ruler

17-Coupling bolts

Embodiment of the invention

Integral cooler solution:

The integral cooler has only one cooling water tank, and its cooling water tank is made of metal material with good thermal conductivity. On the top and the side of the cooling water box, various shapes and connected coolant flow circuits for the directional flow of the coolant are made. The coolant flow circuit is close to the side of the core laminations 8, the The top and the outer side of the coil 11 enable the cooling liquid to take away the heat generated by the core laminations 8 and the coil 11, achieving the purpose of uniformly cooling the entire linear motor.

The cooling liquid flow circuit in the integral cooler is all formed inside the cooling water box, which is easy to ensure the sealing of the circuit. According to the shapes of the iron core laminations 8 and the coils 11 of the linear motor, a cavity is made at the bottom of the cooler box to cover the iron core laminations 8 and the coils 11 . Since the integral cooler is directly set on the linear motor core laminations 8 and coils 11, it is easy to assemble and disassemble, as shown in Fig. 3 .

The coolant flow circuit in the integral cooler is not restricted by the body parts of the linear motor, and the coolant flow circuit can ensure a large enough flow space, so there is no need for special filtering of the coolant. The cooler is filled between the core laminations 8 , the coils 11 and the cooler with a filler 12 with good thermal conductivity, so as to enhance the heat transfer between the core laminations 8 , the coils 11 and the cooler.

Split cooler solution:

The split cooler is composed of multiple cooling water tanks. The cooler box is made of metal materials with good thermal conductivity. Additional cooling pipes are used to connect the cooling water tanks to form various forms of connected cooling fluid Cooling circuit with directional flow.

According to the needs of the linear motor, the cooling water tank with cooling efficiency is determined. Only the upper cooling water tank can be installed; or both the upper cooling water tank and the end cooling water tank can be installed, as shown in Figure 4; or the upper cooling water tank (7A) and the end cooling water tank (7C) can be installed together with the side cooling water tank (7E) , as shown in Figure 5;

According to the shapes of the iron core laminations 8 and the coil body 11 of the linear motor, the bottom of the cooler is a cavity to cover the iron core laminations 8 and the coils 11 . After being packaged, a filler 12 with good thermal conductivity is filled between the core laminations 8 , the coil 11 and the cooler to enhance heat transfer between the core, the coil and the cooler, as shown in FIG. 3 .

The coolant is introduced from the coolant inlet 13a, passes through the coolant flow circuit of the cooler water tank, directly cools the top and end of the core lamination 8 and the side of the coil 11, and finally passes through the coolant outlet 13b on the same side as the coolant inlet Out of the cooler, see Figure 1 and Figure 3.

The invention discloses a linear motor cooling device, which surrounds iron core laminations and coils of the linear motor, and maximizes the effective cooling area of the motor. The cooling device for a linear motor will be described in detail with reference to the accompanying drawings.

A plurality of permanent magnets with alternating magnetic poles form the secondary magnetic steel 2, and the permanent magnets are arranged in a row along the moving direction and fixed on the base 1. The coil 11 is wound on the core lamination 8 made of silicon steel laminations, and the cooler 7 is embedded Put it on the core lamination 8 and the coil 11, cool the coil 11 and the core lamination 8 through the filling extrusion 12 with good thermal conductivity, and connect it with the cover plate 3, move linearly along the guide rail direction through the guide rail 14, and the grating reading head 15 And the grating ruler 16 detects the position and speed of the primary motor, see Figure 6.

Instructions for the installation and cooperation of core lamination coils and coolers-cooler outline description: core laminations 8 and coils 11 are installed in the cavity of the cooler, and outlets for signal wires and wires can be reserved in the cooler. In this way, The entire cooler forms a close fit with the coil assembly composed of the core laminations 8 and the coil 11, and is directly placed on the assembly, leaving sufficient cooling circuit space around and above the cooler. This method essentially adopts the method that the cooler surrounds the core-coil assembly. By making a suitable cavity at the bottom of the cooler according to the shape of the core coil assembly, the core and coil assembly can be nested in the cavity; the cooler box 7 is an internal circuit.

Since the cooler is made of a metal material with good thermal conductivity, and the coil is uneven, it is difficult to form a good contact with the cooler, which greatly affects the cooling efficiency. For this reason, the present invention uses a filler 12 with good thermal conductivity, which is filled between the core laminations 11, the coil 8 and the cooler, as shown in FIG. 3 .

Claims (5)

1. A cooler for a linear motor, characterized in that the cooler is an integral type wall-attached cooler, which consists of a cooling water box that is directly nested and fixed on the linear motor body, and is connected to the cooling water box. The fixedly connected cooling water tank cover and various cooling circuits formed on the inner surface of the cooling water tank for the directional flow and communication of the cooling liquid, at the bottom of the cooling water tank, according to the linear motor core lamination and the shape of the coil body form a cavity for nesting the iron core laminations and coils of the linear motor, and the cooling circuit is formed on the top and each side of the cooling water box. 2. The linear motor cooler according to claim 1, characterized in that a filler with good thermal conductivity is filled between the cooling water tank and the iron core laminations and coils of the linear motor body. 3. A linear motor cooler, characterized in that the cooler is a split-type wall-mounted cooler, consisting of a plurality of cooling water tanks communicated with cooling pipes and fixedly connected to each of the cooling water tanks The cooling water tank cover is composed of the cooling water tanks, and the cooling water tanks are respectively directly installed on each part of the linear motor body, and the inner surface of each cooling water tank is processed for the directional flow of the cooling liquid and is located between the cooling water tanks. The cooling circuit communicated with the cooling pipes between them. At the bottom of the cooler, a cavity for nesting the core laminations and coils of the linear motor is formed according to the shape of the core laminations and coil body of each part of the linear motor. , the cooling circuit is formed on the top and each side of each cooling water tank. 4. The linear motor cooler according to claim 3, characterized in that, fillers with good thermal conductivity are filled between the cooling water tanks and the core laminations and coils of the linear motor body. 5. The linear motor cooler according to any one of claims 1 or 3, characterized in that, the cooling water tank is made of a metal material with good thermal conductivity.

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