JP2019213346A - Method for manufacturing motor case having double structure and motor case having double structure - Google Patents

Abstract

To provide both strength and heat dissipation of a motor case according to the present invention.SOLUTION: A method for manufacturing a motor case having a double structure and a motor case having a double structure according to the present invention represent a method and a configuration in such a manner that a metal deep-drawing case (40) is cast in an aluminum die casting case (10) to obtain a motor case (100) having high strength, good heat dissipation and high shape flexibility by using the aluminum die casting case (10) and the metal deep-drawing case (40).SELECTED DRAWING: Figure 1

Description

    The present invention relates to a manufacturing method of a dual structure motor case and a dual structure motor case, and in particular, combines a heat dissipation property of an aluminum case with a motor case having a high degree of freedom of shape, and has high strength using the advantages of both. In addition, the present invention relates to a novel improvement for providing a motor case with good heat dissipation and a manufacturing method thereof.

  As a method of inserting and fixing this kind of annular stator core 20 used in the past to the aluminum case 9, a method disclosed in Patent Document 1, for example, can be cited. Generally, this type of AC servomotor is configured as shown in FIG. In FIG. 16, a ring-shaped stator core 20 is accommodated in a cylindrical aluminum case 9. The ring-shaped stator core 20 includes a ring-shaped base 21 provided with an outer periphery 21a in contact with the inner peripheral surface 9a of the aluminum case 9, and a plurality of protrusions inwardly projecting from the ring-shaped base 21 at intervals in the circumferential direction. Each of the magnetic poles 22 has a stator coil 23 wound around it. The casing 10 includes a case main body 11 and a front lid 12, and a shaft hole 13 is provided in the case main body 11 and the front lid 12. A rotary shaft 30 is inserted into the shaft hole 13, and the rotary shaft 30 is rotatably supported by the aluminum case 9 via a pair of bearings 14. A rotor 40 made of a magnetic material is disposed inside the annular stator iron core 20, and the rotor 40 rotates integrally with the rotary shaft 30. The aluminum case 9 is manufactured using aluminum which is a non-magnetic material. Although not shown, the annular stator core 20 may be sealed with a resin agent to ensure the same function as the aluminum case 9.

JP 2009-133102 A

In the conventional AC servo motor as described above, when the aluminum case 9 is made of aluminum, the annular stator core 20 is inserted into the aluminum case 9 and fixed due to the difference in thermal expansion coefficient between the annular stator core 20 and the aluminum case. A shrink fitting process is required. Therefore, a long heating time is required to uniformly heat the entire case, and improvement in productivity is hindered.
Further, when the aluminum case 9 is made of aluminum and when the same function as that of the case made of a resin agent (not shown) is ensured, since the aluminum and the resin agent are non-magnetic materials, the annular stator iron core and the magnetic circuit are It could not be shared, and the overall volume was large.

  The present invention has been made to solve the above-described problems, and in particular, combines the heat dissipation of an aluminum case with a motor case (metal deep-drawing case) such as iron with a high degree of freedom in shape. An object of the present invention is to provide a method for manufacturing a dual-structure motor case having high strength and good heat dissipation by using the advantages, and a dual-structure motor case.

  A method for manufacturing a double-structure motor case according to the present invention includes forming a metal deep drawing case formed by metal deep drawing, and casting the metal deep drawing case into an aluminum die casting case. A method of making a motor case having a double structure by a case and the metal deep drawing case, wherein the metal deep drawing case is located inside the aluminum die cast case, and the metal deep drawing case. The base of the drawing case is a method provided in the front lid portion of the aluminum die-casting case, and the plurality of holes formed in the front portion of the metal deep-drawing case are provided at the time of aluminum die-casting. This is a method in which aluminum is embedded, and the dual-structure motor case according to the present invention is a metal deep drawing case formed by metal deep drawing. The metal deep drawing case is cast into an aluminum die cast case, and the aluminum die cast case and the metal deep drawing case form a double-structure motor case, Further, the metal deep drawing case is configured to be located inside the aluminum die cast case, and the base of the metal deep drawing case is provided to the front lid portion of the aluminum die cast. In addition, aluminum at the time of aluminum die casting is embedded in the plurality of holes formed in the front portion of the metal deep drawing case.

Since the manufacturing method of the dual structure motor case and the dual structure motor case according to the present invention are configured as described above, the following effects can be obtained. That is, a metal deep drawing case formed by metal deep drawing is formed, and the metal deep drawing case is cast into an aluminum die cast, so that a motor having a double structure is formed by the aluminum die casting case and the metal deep drawing case. By making the case, it is possible to obtain a dual-structure motor case with a high degree of freedom in shape and good temperature characteristics by using a strong iron core metal case and an excellent heat dissipation aluminum case. In addition, since the metal deep drawing case is located inside the aluminum die cast, a double shaft bearing of a rotating shaft can be easily obtained. Further, the base of the metal deep drawing case is provided in the front lid portion of the aluminum die cast case, so that the base can be firmly embedded in the aluminum die cast to obtain a highly rigid motor case. it can.
In the plurality of holes formed in the front part of the metal deep drawing case, aluminum at the time of aluminum die casting is embedded to further promote the integration of the aluminum die casting case and the metal deep drawing case. Can do.

It is sectional drawing which shows the motor case of the double structure by this invention. It is a left view of FIG. It is a front view of FIG. FIG. 4 is a right side view of FIG. 3. It is sectional drawing which shows the metal deep drawing case of FIG. FIG. 6 is a right side view of FIG. 5. FIG. 6 is a left side view of FIG. 5. FIG. 6 is a front view of FIG. 5. It is a front view of the motor case of FIG. It is a perspective view of the motor case of FIG. It is a back surface perspective view which shows the back side of FIG. It is sectional drawing of FIG. It is sectional drawing which shows the metal deep drawing case of FIG. It is a longitudinal cross-sectional view of the resolver built-in type servomotor using the metal deep drawing case of this invention. FIG. 15 is an external view of FIG. 14. It is sectional drawing of the conventional AC servomotor.

A preferred embodiment of a method for manufacturing a dual structure motor case and a dual structure motor case according to the present invention will be described below with reference to the drawings.
In addition, the same code | symbol is demonstrated to the part which is the same as that of the conventional side, or an equivalent.
In FIG. 1, what is indicated by reference numeral 10 is an aluminum die cast case cast by a mold (not shown), and an aluminum shaft hole 13 (actually at the center position of the front lid portion 12 of the aluminum die cast case 10 is shown. (Not shown) is also mounted).

A front portion 41 of the metal deep drawing case 40 is provided in the front lid portion 12 of the aluminum die cast case 10.
The front portion 41 of the metal deep drawing case 40 is bent in an arc shape, and a plurality of elongated holes 42 are formed at predetermined angular intervals along the circumferential direction.
Each hole 42 is filled with aluminum 44 during aluminum die casting, and the front portion 41 is cast into the aluminum die cast case 10.

A cylindrical portion 40a of the metal deep drawing case 40 is formed by being cast into an inner surface 10a of the aluminum die cast case 10, and has a case shaft hole 10A on the front portion 41 side of the metal deep drawing case 40. A base 50 is embedded in the front lid portion 12.
The aluminum bearing hole 13 and the case bearing hole 10A are configured to be concentric with each other, and the bearings and the rotary shaft 70 that are required are omitted here.

Next, FIGS. 10 to 15 describe a manufacturing method of a dual structure motor case according to the present invention and an outline of manufacturing a dual structure motor case.
10 and 11 show the double-structured motor case 10 after completion. FIG. 12 shows a cross section of the aluminum die-cast case 10 that has been cooled and solidified after casting a metal deep-drawn case 40 produced in advance into a molten aluminum die-cast case 10 cast by a mold (not shown). However, as described above, the aluminum die-cast case 10 is configured in a double manner. Note that, as in the shape shown in FIGS. 10 and 11 described above, the aluminum case or the conventional aluminum case 9 formed by processing with metal (for example, only iron) is much more It is possible to obtain the dual case motor case 100 of the present application having the characteristics of strength, heat dissipation, and high degree of freedom of shape, making the best use of the advantages of the metal case and the aluminum.
In addition, although the said metal deep drawing case 40 has described the case where iron is used, the well-known alloy which can be drawn other than iron can also be used.

Next, the gist of the dual structure motor case manufacturing method and dual structure motor case according to the present invention is as follows.
That is, the metal deep drawing case 40 formed by metal deep drawing is formed, and the metal deep drawing case 40 is cast into the aluminum die casting case 10, so that the aluminum die casting case and the metal deep drawing case 40 are used. It is a method and a structure for making a motor case 100 having a double structure, and the metal deep drawing case 40 is a method and a structure located inside the aluminum die cast case 10, and the metal deep drawing case. The base 50 of the case 40 has a method and configuration provided in the front lid portion 12 of the aluminum die-cast case 10, and is in a plurality of holes 42 formed in the front portion 41 of the metal deep drawing case 40. Is a method and configuration in which aluminum of the aluminum die-cast case 10 is embedded.

  A method for manufacturing a double-structure motor case and a double-structure motor case according to the present invention are strong and high by casting a metal deep-drawn case into an aluminum die cast forming an aluminum case to be molded. A double-structure motor case with heat dissipation can be obtained, which can greatly contribute to the production of high-quality servo data.

DESCRIPTION OF SYMBOLS 9 Aluminum case 10 Aluminum die-cast case 10A Case bearing hole 10a Inner surface 12 Front lid part 13 Aluminum bearing hole 40 Metal deep drawing case 41 Front part 42 Hole 44 Aluminum 50 Base 50A Aluminum base 70 Rotating shaft 80 Mounting part 81 Motor Rotor 82 motor stator 83 resolver 84 resolver stator 85 resolver rotor 90 connector pin holding portion 91 connector pin 100 double structure motor case 101 double bearing

Claims (8)

  By forming a metal deep drawing case (40) formed by metal deep drawing and casting the metal deep drawing case (40) into an aluminum die cast case (10), the aluminum die cast case (10) and A method for manufacturing a dual-structure motor case, wherein a double-structure motor case (100) is formed by the metal deep drawing case (40).   The method for manufacturing a double-structure motor case according to claim 1, wherein the metal deep-drawn case (40) is located inside the aluminum die-cast case (10).   The double structure motor according to claim 1, wherein the base (50) of the metal deep drawing case (40) is provided on a front lid portion (12) of the aluminum die cast case (10). Case manufacturing method.   The aluminum (44) of the aluminum die-cast case is embedded in the plurality of holes (42) formed in the front part (41) of the metal deep drawing case (40). 4. A method of manufacturing a motor case having a double structure according to any one of items 3 to 3.   It has a metal deep drawing case (40) formed by metal deep drawing, and the metal deep drawing case (40) is cast into an aluminum die cast case (10), whereby the aluminum die cast case (10 ) And the metal deep drawing case (40) constitutes a double structure motor case (100).   6. The double-structure motor case according to claim 5, wherein the metal deep drawing case (40) is located inside the aluminum die-cast case (10).   The dual structure motor according to claim 5, wherein the base (50) of the metal deep drawing case (40) is provided on a front lid portion (12) of the aluminum die cast case (10). Case.   The aluminum (44) at the time of aluminum die-casting is embedded in the plurality of holes (42) formed in the front part (41) of the metal deep drawing case (40). The motor case of the double structure in any one of 7 thru | or 7.

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