JP2004072830A - Rotating electric machine and method of manufacturing the same - Google Patents

Abstract

An object of the present invention is to provide a rotating electric machine capable of improving a radiation cooling effect in a rotating electric machine such as a small servo motor, a DC brushless motor, a small induction motor, and the like.
A rotating electric machine including a case (21) having a split core formed by dividing a yoke (11) and a teeth (12) of an armature core and a separately configured rotor (6), the yoke (11) of the armature core. Is provided in a state of being insert-molded in a case 21 of the rotating electric machine, while the teeth portion 12 provided with the armature winding 13 is provided in a state of being mounted on the yoke portion 11. The case 21 related to the insert molding is formed by die casting using aluminum or other casting methods. At least one of a mounting leg (not shown) and a mounting flange 22 can be formed integrally with the case 21. In addition, the case 21 has cooling fins for heat radiation (not shown). ) Can be integrally formed.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotating electric machine, and more particularly, to a structure of a rotating electric machine capable of improving a radiation cooling effect in a rotating electric machine such as a small servomotor, a DC brushless motor, a synchronous motor, a small induction motor, and the like.
[0002]
[Prior art]
Conventionally, rotary electric machines such as small servo motors, DC brushless motors, small induction motors, and synchronous motors are manufactured by inserting a separately wound tooth part into a yoke part of an armature core and uniting the two parts. Armature, or insert an armature formed by applying windings to an armature iron core integrated with a yoke function and a tooth function into a case formed by aluminum extrusion molding or aluminum die casting. Alternatively, the case (stator) is formed by integrally molding the armature with an insulating resin.
[0003]
FIG. 3 is a sectional view showing an example of the structure of a conventional servomotor. In the example shown in the figure, the conventional servomotor is prepared by separately preparing an armature core yoke portion 31 and a tooth portion 32, and inserting and combining a separately wound tooth portion 32 with the yoke portion 31. Then, a case 41 (stator portion 41) is formed by resin molding. Further, a structure is adopted in which the stator portion 41 is attached to a mounting flange 42. Most of the heat generated during the operation of the servomotor is generated in the winding 33, and the generated heat is released to the outside of the servomotor via the teeth 32, the yoke 31, the case (stator) 41, and the mounting flange 42 in order. Is done. Further, when the rotating electric machine is provided with cooling fins, heat is also released from the cooling fins.
[0004]
FIG. 4 is a sectional view showing another example of a conventional servo motor structure. In the example shown in the figure, the armature core yoke 51 and the teeth 52 are separately prepared by dividing the armature core yoke 51, and the teeth 52, which are separately wound, are inserted into the yoke 51 and combined, Although the winding 53 is applied to the teeth portion 52 and the case 61 has a structure in which the case 61 is assembled to the mounting flange portion 62, it is the same as the rotating electric machine of the example of FIG. 1, but the case (stator portion) 61 is made of aluminum. It is formed by an extruded material. In this case, unlike the example shown in FIG. 3, the heat is not formed by resin molding but is a metal material having good heat conductivity.
[0005]
[Problems to be solved by the invention]
However, these conventional techniques have the following problems. That is, in the case of the prior art shown in FIG. 3, since the material of the case (stator portion) 41 is only a resin having a low thermal conductivity, heat generated in the winding 33 inside the armature is reduced. The transmission to the mounting flange 42 or the cooling fins was not good, and there was a limit to the discharge of heat generated in the armature to the outside of the rotating electric machine.
[0006]
On the other hand, in the case of the conventional technique shown in FIG. The heat conduction during this period is not good. In addition, it is disadvantageous in terms of manufacturing cost, for example, the cost of finishing the inner surface and the end surface of the case (stator portion) 61 is high.
[0007]
If the heat generated inside the armature cannot be effectively transmitted to the supporting members such as the mounting flange and this can be efficiently released to the outside of the rotating electric machine, the armature will burn out due to overheating and the life of the rotating electric machine will be shortened. Will cause. Further, in each field of use, there is an increasing demand for smaller and lighter rotating electric machines from various viewpoints, and the establishment and improvement of cooling and heat radiation technology is greatly related to the smaller and lighter rotating electric machines.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a rotating electric machine capable of improving a heat radiation cooling effect in a rotating electric machine such as a small servo motor, a DC brushless motor, and a small induction motor. . This contributes to the promotion of miniaturization and lightening of the rotating electric machine.
[0009]
[Means for Solving the Problems]
As a result of intensive studies on the above problem, the inventors of the present invention have found that the problem can be solved by insert-molding the yoke portion of the split iron core into a case made of aluminum die-casting and integrally molding the flange portion and the case, and have reached the present invention. . That is, the invention claimed in the present application is as follows.
[0010]
(1) In a rotary electric machine including a stator having a split core formed by dividing a yoke portion and a tooth portion of an armature core and a separately configured rotor, the yoke portion of the armature core is a case of the rotary electric machine. A rotating electric machine characterized in that a tooth portion provided with an armature winding is provided in a state mounted on the yoke portion.
[0011]
(2) The rotating electric machine according to (1), wherein the molding of the case according to the insert molding is performed by die casting or other casting methods.
[0012]
(3) The rotating electric machine according to (1) or (2), wherein the metal used for forming the case related to the insert molding is aluminum.
[0013]
(4) The rotary electric machine according to any one of (1) to (3), wherein at least one of the mounting leg and the mounting flange is formed integrally with the case.
[0014]
(5) The rotating electric machine according to any one of (1) to (4), wherein a cooling fin for heat radiation is formed integrally with the case.
[0015]
(6) The rotating electric machine according to any one of (1) to (5), wherein the rotating electric machine is any one of a servo motor, a DC brushless motor, a synchronous motor, and an induction motor.
[0016]
(7) A stator including an armature core having a yoke portion and a toothed portion provided with a winding, and a separately configured rotor, wherein the armature core is divided into the yoke portion and the teeth portion. A method for manufacturing a rotating electrical machine, comprising: a yoke manufacturing process for manufacturing the yoke portion; and forming a case of the rotating electrical machine by die casting or other casting methods, and simultaneously inserting the yoke manufactured in the yoke manufacturing process. An insert molding step of molding, and a tooth part inserting step of inserting and mounting the teeth part separately wound on the yoke part integrally formed with the case in the insert molding step, A method of manufacturing a rotating electric machine.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to the drawings, but the present invention is not limited to only the configurations shown in these drawings.
FIG. 1 is a sectional view showing the structure of a rotating electric machine according to the present invention, taking a servomotor as an example. In the figure, the rotating electric machine according to the present invention includes a case 21 (stator portion 21) having a split core formed by dividing a yoke portion 11 and a teeth portion 12 of an armature core, and a rotor 6 separately configured. An electric machine, wherein the yoke portion 11 of the armature core is provided in a state where the yoke portion 11 is insert-molded in a case 21 of a rotating electric machine, while the teeth portion 12 provided with the armature winding 13 is attached to the yoke portion 11. It is assumed that the main configuration is provided in a state where it is provided. In the figure, among the armature portions composed of the teeth 12 and the windings 13 shown above and below the rotor 6, an armature portion shown below is a cross-sectional view, and an armature portion shown above is a side view thereof. Show.
[0018]
In the present rotating electric machine, in the present rotary electric machine, the case 21 related to the insert molding can be formed by die casting or other casting methods, and the metal used to form the case 21 has good heat conductivity. For example, this can be aluminum.
[0019]
At least one of a mounting leg (not shown) and a mounting flange 22 can be formed integrally with the case 21. In addition, the case 21 has cooling fins for heat radiation (not shown). ) Can be integrally formed.
[0020]
[Action]
In FIG. 1, since the rotating electric machine of the present invention is configured as described above, the case 21 (stator portion 21) having the split core and the yoke portion 11 of the armature core formed by insert molding the case 21 are formed by insert molding. As a result, the teeth 12 on which the armature winding 13 is provided are attached to the yoke 11, so that the heat generated in the winding 13 is (1) ) The teeth 12, (2) the yoke 11, and (3) the case 21, are sequentially transmitted very well, and are satisfactorily discharged to the outside of the rotary electric machine through the mounting flange 22 and the like. That is, the thermal resistance from the winding 13 to the mounting flange 22 and the like is reduced, the temperature rise of the winding 13 is suppressed, the danger of burning of the winding is reduced, and the life of the armature is significantly improved. Is done.
[0021]
In the figure, the case 21 has at least one of a mounting leg (not shown) and a mounting flange 22 formed integrally therewith, so that the heat generated in the windings 13 is (1) The teeth 12, (2) the yoke 11, (3) the case 21, (4) the mounting flange 22 formed integrally with the case 21, and the like, are successively transmitted in an extremely good manner, and the mounting is performed. It is satisfactorily discharged to the outside of the rotating electric machine through the flange portion 22 and the like. When the heat radiating cooling fins (not shown) are formed integrally with the case 21, heat is radiated also through the fins. As a result, the thermal resistance from the winding 13 to the mounting flange 22, the cooling fins for heat radiation, and the like is reduced, the temperature rise of the winding 13 is suppressed, and the risk of burning of the winding is reduced. Life is also significantly improved.
[0022]
By using the same material such as aluminum for the integral molding of the case 21 and the mounting flange 22, etc., the heat conduction between them becomes very good, and the heat from the winding 13 to the mounting flange 22 etc. The resistance is reduced, the temperature rise of the winding 13 is suppressed, the risk of winding damage is reduced, and the life of the armature is significantly improved.
[0023]
FIG. 2 is a flowchart showing a method for manufacturing a rotating electric machine according to the present invention. In the figure, the method comprises a stator comprising an armature core having a yoke portion and a toothed portion, and a separately constructed rotor, wherein the armature core is divided into the yoke portion and the teeth portion. And a yoke part manufacturing step S1 for manufacturing a yoke part after a necessary step SX, and simultaneously forming a case of the rotary electric machine by die casting or other casting methods. And an insert molding step S2 for insert-molding the yoke part manufactured in the yoke manufacturing step S1, and inserting the teeth separately wound into the yoke part integrally formed in the case in the insert molding step S2. The main configuration is that the rotary electric machine P is manufactured through a tooth part inserting step S3 to be mounted and other necessary steps SY. By going through the respective steps of SX, S1, S2, S3, and SY, it is possible to manufacture a rotating electric machine with an improved heat radiation cooling effect, which is the subject of the present invention.
[0024]
【The invention's effect】
According to the rotating electric machine and the method of manufacturing the same according to the present invention, the heat circuit resistance from the heat generating portion to the heat radiating portion is reduced because of the configuration described above, and the heat radiating cooling effect can be improved. That is, the heat generated in the windings inside the armature is efficiently transmitted to the housing member such as the flange, and can be efficiently released to the outside of the rotating electric machine. Of the rotary electric machine and shortening of the life of the rotating electric machine can be prevented, and as a result, reliability can be improved in terms of insulation life and the like. Since these effects are also exerted in a small and lightweight rotating electric machine, the small and lightweight rotating electric machine can be promoted.
[Brief description of the drawings]
FIG. 1 is a sectional view showing the structure of a rotating electric machine according to the present invention, taking a servomotor as an example.
FIG. 2 is a flowchart showing a method for manufacturing a rotating electric machine according to the present invention.
FIG. 3 is a sectional view showing an example of the structure of a conventional servomotor.
FIG. 4 is a cross-sectional view showing another example of a conventional servo motor structure.
[Explanation of symbols]
6 ... rotor, 11, 31, 51 ... yoke part, 12, 32, 52 ... teeth part, 13, 33, 53 ... winding, 21 ... case (stator part), 22 ... mounting flange part, 41, 61 ... case (Stator portion), 42, 62: mounting flange portion, S1: yoke portion manufacturing process, S2: insert molding process, S3: tooth portion inserting process, SX, SY: other necessary processes

Claims (7)

In a rotating electric machine including a stator having a split core formed by dividing a yoke portion and a tooth portion of an armature core and a separately formed rotor, the yoke portion of the armature core is insert-molded in a case of the rotating electric machine. A rotating electric machine, wherein the teeth portion provided with the armature winding is provided in a state of being mounted on the yoke portion. The rotating electric machine according to claim 1, wherein the molding of the case according to the insert molding is performed by die casting or another casting method. The rotating electric machine according to claim 1, wherein a metal used for forming the case related to the insert molding is aluminum. 4. The rotating electric machine according to claim 1, wherein at least one of a mounting leg and a mounting flange is formed integrally with the case. 5. The rotating electric machine according to any one of claims 1 to 4, wherein cooling fins for heat radiation are formed integrally with the case. The rotating electric machine according to any one of claims 1 to 5, wherein the rotating electric machine is one of a servo motor, a DC brushless motor, a synchronous motor, and an induction motor. A stator composed of an armature core having a yoke part and a toothed part provided with a winding, and a separately configured rotor, wherein the armature core is divided into the yoke part and the teeth part, A method for manufacturing an electric machine, comprising: a yoke manufacturing process for manufacturing the yoke, and an insert for forming a case of the rotating electrical machine by die-casting or other casting methods and simultaneously insert-molding the yoke manufactured in the yoke manufacturing process. A rotating step characterized by passing through a molding step and a tooth part inserting step of inserting and attaching the separately wound teeth part to the yoke part integrally formed with the case in the insert molding step. Manufacturing method of electric machine.

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