Servo motor mounting method

Abstract

To provide a method of mounting a servo motor so as to increase the cooling performance.SOLUTION: In a mounting method for a servo motor having a load side end bracket, an anti-load side end bracket, and a rotating body included in a housing between the end brackets, the load side end bracket has a through hole provided in the load side end bracket. The servo motor is mounted on a heat dissipation plate in such a way that the through hole provided in the load side end bracket overlaps a through hole previously provided in the heat dissipation plate.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to mounting servo motors. [Background technology]

[0002] Servo motors are widely used in industrial applications, for example, where the conditions of use can be severe, and the temperature rise of the motor is an inherent problem.

[0003] As an example of motor cooling technology, Patent Document 1 describes a motor cooling structure that includes a heat dissipation member that is placed on the surface of the motor and has a higher thermal conductivity than the motor, and a fixing member made of an elastic material that can be elastically deformed, and the elastic restoring force of the fixing member causes the heat dissipation member to adhere to the surface of the motor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-47577 Summary of the Invention [Problem to be solved by the invention]

[0005] The technique disclosed in Patent Document 1 has a problem in that consideration of exhaust gas from inside the housing, that is, consideration of improving cooling performance, is insufficient. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a mounting method for a servo motor that improves cooling performance. [Means for solving the problem]

[0006] A method for mounting a servo motor having a load-side end bracket, a non-load-side end bracket, and a rotating body enclosed in a housing between them, the load-side end bracket having a through-hole provided therein, and when mounting the servo motor to a heat sink, the method mounts the servo motor so that the through-hole provided in the load-side end bracket overlaps with a through-hole previously provided in the heat sink. [Effects of the Invention]

[0007] According to the present invention, the cooling performance of the servo motor can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an overall view of the servo motor installation. [Figure 2] FIG. 10 is a plan view of the load-side end bracket to which the heat sink is attached. [Figure 3] FIG. 2 is a plan view of a heat sink on which a servo motor is mounted. [Figure 4] FIG. 10 is a plan view of the end bracket on the anti-load side. [Figure 5] FIG. 2 is a schematic cross-sectional view of a servo motor. DETAILED DESCRIPTION OF THE INVENTION [Example]

[0009] Figure 1 shows the overall mounting of a servo motor. The servo motor has an end bracket 101 on the load side, an end bracket 107 on the non-load side, and a stator core 109 with a housing between them. 10 is the rotating shaft of the servo motor.

[0010] 104 is a heat sink, which can also be called a heat sink.

[0011] The present invention is characterized in that holes that allow air to pass through are provided in the load side end bracket 101, the anti-load side end bracket 107, the housing-attached stator core 109, and the heat sink 104.

[0012] Next, the structure of the through holes in each component will be described.

[0013] The structure of the load-side end bracket 101 will be described using Figure 2. The load-side end bracket 101 is made of metal and has a first through hole 102 and a second through hole 103 in part thereof. In Figure 2, the first through hole 102 is circular and the second through hole 103 is approximately rectangular, but the shapes are not limited to this.

[0014] In FIG. 2, there are four first through holes 102 and eight second through holes 103.

[0015] Next, a desirable configuration for the first through holes 102 and the second through holes 103 will be described. The second through holes 103 are desirably positioned symmetrically to one another. This includes both line symmetry and rotational symmetry. For example, eight through holes are arranged at 45-degree angles, four at 90-degree angles, or three at 120-degree angles. By arranging them symmetrically in this manner, it is possible to avoid the generation of unnecessary stress and to achieve uniform cooling performance within the surface.

[0016] 2, the number of first through holes 102 is smaller than the number of second through holes 103, but each first through hole 102 is configured to be larger than the size of the second through holes 103. In other words, it is desirable to configure the first through holes 102 and second through holes 103 so that the area per hole of the fewer number of through holes is larger than the area per hole of the greater number of through holes. This is to make the cooling efficiency more uniform across the surface of the load-side end bracket 101.

[0017] The structure of the heat sink 104 will be explained using Figure 3. Note that a thin load-side end bracket 101 is shown at the top of the figure. This is for the convenience of the following explanation, and in reality, 101 is separate from the heat sink 104.

[0018] The heat sink 104 is made of metal and has a first through hole 105 and a second through hole 106. The first through hole 105 in FIG. 3 is formed so as to overlap with the first through hole 102 in FIG. 2. The second through hole 106 in FIG. 3 is formed so as to overlap with the second through hole 103 in FIG. 2. In this way, the overlapping of the through holes 102 and 105, and the overlapping of the through holes 103 and 106, forms an air passage.

[0019] In this case, it is desirable that through holes 102 and 105, and through holes 103 and 106, have approximately the same shape and size. This is because, from the perspective of cooling, in addition to the air-cooling effect based on the air flow through the through holes, it is also necessary to consider the formation of a heat flow path and cooling due to heat transfer between the metals at the contact surface between load-side end bracket 101 and heat sink 104. Therefore, simply increasing the size of the through holes alone would reduce the area of ​​the metal region, which could actually result in a decrease in overall cooling efficiency. Therefore, it is desirable that through holes 102 and 105, and through holes 103 and 106, have approximately the same shape and size. Alternatively, it is desirable that at least one of them has approximately the same shape and size.

[0020] The structure of the end bracket 107 on the non-load side will be explained using Figure 4. A through hole 108 is formed in the end bracket 107 on the non-load side. Motors typically have a certain length. In such a structure, heat tends to build up in the end bracket located on the lower side of the motor in the figure, i.e., the non-load side. For this reason, by forming a through hole 108 in the end bracket 107 on the non-load side, air flow is created, making it possible to promote heat dissipation.

[0021] Here, the through-hole 108 of the non-load-side end bracket 107 is offset in plan from the first through-hole 102 of the load-side end bracket 101 or the first through-hole 105 of the heat sink 104. This can be achieved by various methods, such as varying the angle, position, or shape of the holes. By offsetting the holes in plan in this way, the air flow is more diffused and flows in multiple directions, which is intended to improve cooling efficiency.

[0022] 5 is a schematic cross-sectional view of the servo motor in the area related to the rotor and stator. 109 is a stator core with a housing, 110 is a rotor core, and 111 is a lightening hole in the rotor core. 10 is a rotating shaft.

[0023] In Figure 5, the lightening holes 111 in the rotor core contribute to the air flow. At the same time, these lightening holes 111 also contribute to reducing the inertia of the motor. The air flow through the lightening holes 111 in the rotor core leads to air cooling of the rotor core and magnets, which are factors that cause temperature rise, and therefore has a great cooling effect.

[0024] With the above configuration, air passes through through hole 108 in anti-load side end bracket 107 and lightening hole 111 in the rotor core, then passes through first through hole 102 in load side end bracket 101 and first through hole 105 in heat sink 104, or second through hole 103 in load side end bracket 101 and second through hole 106 in heat sink 104, and passes through the entire servo motor. In this way, the present invention can provide a structure and an installation method that improves cooling performance in a servo motor.

[0025] Furthermore, in cases where a component corresponding to the heat sink 104 is already installed in the user's device or equipment, the improvement in cooling performance described in this invention can be achieved by using a servo motor that satisfies the relationship detailed above, or by installing a servo motor that satisfies the relationship.

[0026] Furthermore, one example of the technical idea detailed above can also be expressed as follows.

[0027] <Part 1> A method for mounting a servo motor having a load-side end bracket, an anti-load-side end bracket, and a rotor enclosed in a housing between them, comprising: the load-side end bracket has a through-hole formed therein, A method for mounting a servo motor, in which the servo motor is mounted on a heat sink so that a through hole provided in the load side end bracket overlaps a through hole previously provided in the heat sink.

[0028] <Part 2> In the servo motor mounting method described in <No. 1>, A method for mounting a servo motor, in which the through hole provided in the load side end bracket and the through hole provided in advance in the heat sink each have a first through hole and a second through hole, and the first through hole and the second through hole are both overlapped on the load side end bracket and the heat sink.

[0029] <Part 3> In the servo motor mounting method described in <No. 2>, A method for mounting a servo motor in which the first through holes and the second through holes are different in size and number, and the size of each of the fewer number of through holes is larger than the size of each of the more number of through holes.

[0030] <Part 4> In the servo motor mounting method described in <Part 2>, A method for mounting a servo motor, wherein the end bracket on the non-load side has a through hole, and the through hole is provided at a different position in plan view from the through hole provided in the end bracket on the load side.

[0031] <Part 5> In the servo motor mounting method described in <Part 2>, A method for mounting a servo motor, wherein the first through holes and the second through holes have substantially the same size and shape. [Explanation of symbols]

[0032] 10: Servo motor rotation axis 101: Load side end bracket 102: First through hole provided in the load side end bracket 103: Second through hole provided in the load side end bracket 104: Heat sink 105: A first through hole in the heat sink corresponding to 102 106:203 compliant second through hole in the heat sink 107: End bracket on the non-load side 108: Through hole provided in the end bracket on the non-load side 109: Stator core with housing 110: Rotor core 111: Rotor core lightening hole

Claims

1. A method for mounting a servo motor having a load-side end bracket, an anti-load-side end bracket, and a rotor enclosed in a housing between them, comprising: the load-side end bracket has a through-hole formed therein, A method for mounting a servo motor, in which the servo motor is mounted on a heat sink so that a through hole provided in the load side end bracket overlaps a through hole previously provided in the heat sink.

2. 2. The servo motor mounting method according to claim 1, A method for mounting a servo motor, in which the through hole provided in the load side end bracket and the through hole provided in advance in the heat sink each have a first through hole and a second through hole, and the first through hole and the second through hole are both overlapped on the load side end bracket and the heat sink.

3. 3. The servo motor mounting method according to claim 2, A method for mounting a servo motor in which the first through holes and the second through holes are different in size and number, and the size of each of the fewer number of through holes is larger than the size of each of the greater number of through holes.

4. 3. The servo motor mounting method according to claim 2, A method for mounting a servo motor, wherein the end bracket on the non-load side has a through hole, and the through hole is provided at a different position in plan view from the through hole provided in the end bracket on the load side.

5. 3. The servo motor mounting method according to claim 2, A method for mounting a servo motor, wherein the first through holes and the second through holes have substantially the same size and shape.

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