Transport tray for a stator of a motor

Abstract

Provided is a transport tray (1) for a motor stator that mounts a motor stator on a conveyer to transport the motor stator, the motor stator including a core portion formed by stacking a plurality of annular electromagnetic steel sheets, and a coil wound around a plurality of slots formed at a prescribed interval in an inner circumferential portion of the core portion. When manufacturing the motor stator on a production line, heat loss during molding can be suppressed, heating time can be shortened, and cooling time after molding can also be shortened. The transport tray includes a flat plate-shaped main body (2) that is moved by the conveyer, an opening (21) is formed in the center portion of the main body (2) in a manner that penetrates in the up-down direction, and a plurality of heat insulating materials (3) are provided on the upper surface (2a) of the main body (2) at a position outside the opening (21) in a manner that are spaced apart in the circumferential direction of the opening (21).

Description

TECHNICAL FIELD

[0001] The present application relates to a transport pallet for a motor stator, which transports the motor stator mounted on a conveyer, wherein the motor stator includes a core formed by stacking a plurality of annular electromagnetic steel sheets, and a coil wound around a plurality of slots formed at a predetermined interval in an inner circumferential portion of the core. BACKGROUND

[0002] Conventionally, when a workpiece is sequentially subjected to processing, machining, or the like on a production line to be productized, a transport pallet is used to mount the workpiece on a conveyer to be transported. The transport pallet is known to have various types (for example, refer to Patent Literature 1).

[0003] Further, the motor stator includes a core formed by stacking a plurality of annular electromagnetic steel sheets, and a coil wound around a plurality of slots formed at a predetermined interval in an inner circumferential portion of the core, and the motor stator is manufactured by batch processing. The current situation is that the motor stator is not manufactured on a production line. The motor stator is manufactured by molding, that is, an insulating resin is injected into at least a gap between the core and the coil while the core is inserted into a cylindrical frame and an injection mold is inserted into the core, and the insulating resin is cured to be molded. However, when the motor stator is molded, there are problems that the configuration of the equipment for molding is complicated, and the molding time is long. The cause of these problems is considered to be due to the fact that the manufacture of the motor stator by the production line cannot be achieved.

[0004] Therefore, the present applicant is working on research and development to solve the above problems. In the process, regarding the transport pallet for mounting the motor stator on the conveyer to be transported, the following problems have been found. That is, when molding, since the injection mold described above is placed on the transport pallet, heat for heating the motor stator is conducted to the transport pallet through the injection mold, thereby causing heat loss. As a result, it takes time to heat the motor stator to an appropriate temperature. In addition, since the transport pallet is also heated due to the heat at the time of heating the motor stator, it takes time to cool the motor stator after molding.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent Application Publication No. 2018-1390 SUMMARY

[0008] The present application has been made in view of the above problems, and has as its object to provide a transport tray for a motor stator that can suppress heat loss during molding and achieve a reduction in heating time when a motor stator is manufactured on a production line, and that can also achieve a reduction in cooling time after molding.

[0009] To solve the above problems, the present application relates to a transport tray for a motor stator that transports a motor stator mounted on a conveyer, wherein the motor stator has a core portion formed by stacking a plurality of annular electromagnetic steel sheets, and a coil wound around a plurality of slots formed at a prescribed interval in an inner circumferential portion of the core portion, characterized in that the transport tray for the motor stator has a flat plate-shaped main body loaded on the conveyer, and a plurality of heat insulating materials that extend in a straight line in a radial direction passing through the center of the opening are provided at a prescribed interval in the circumferential direction of the opening in the upper surface of the main body at a position outside the opening.

[0010] According to the present application, when the injection mold is loaded on the transport tray, the plurality of heat insulating materials are interposed between the injection mold and the main body of the transport tray. By the interposition of the heat insulating materials, it is possible to suppress the heat that heats the motor stator during molding from being conducted to the main body of the transport tray via the injection mold, thereby suppressing heat loss during molding. Accordingly, it is possible to achieve a reduction in heating time during molding. In addition, when cooling after molding, a coolant such as air can flow through the opening in the main body of the transport tray, so it is also possible to achieve a reduction in cooling time. Furthermore, the heat insulating materials are not provided on the entire surface of the upper surface of the transport tray, so it is possible to reduce the cost of materials and the like required to produce the heat insulating materials, thereby contributing to a reduction in the cost of the transport tray.

[0011] In addition, in the present application, it is preferable that the heat insulating materials be arranged at equal intervals in the circumferential direction of the opening. Accordingly, the total weight of the motor stator and the injection mold can be borne equally by each of the heat insulating materials, so that the state of loading of the motor stator and the injection mold on the transport tray becomes stable. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 (a) is a plan view showing an embodiment of the transport tray for a motor stator of the present application. (b) is an A-A cross-sectional view of the transport tray for a motor stator shown in (a).

[0013] Figure 2 is a cross-sectional view showing the state of loading of the motor stator on the transport tray for a motor stator shown in (a) and (b) by means of the injection mold. Figure 1 (a) (b) are cross-sectional views showing the state of the transport tray for a motor stator shown in (a) and (b).

[0014] Reference Signs List

[0015] 1…transport tray; 2…main body; 2a…upper surface; 21…opening; 3…heat insulating material; 5…stator for motor; 51…core; 51a…slot; 52…coil. DETAILED DESCRIPTION

[0016] Reference Signs List Figure 1 (a) (b) The transport tray 1 of the stator for motor of the present embodiment will be described. The transport tray 1 is provided with: a flat plate-shaped main body 2 which is loaded on a conveyer which is not shown. The main body 2 is made of aluminum, and the planar shape is a 12-sided polygon. In the central portion of the main body 2, an opening 21 is provided in a manner of penetrating in the up-and-down direction. The planar shape of the opening 21 is circular. Further, on the upper surface 2a of the main body 2 at a position outside the opening 21, a plurality of heat insulating materials 3 which extend in a manner of being spaced apart in the circumferential direction are provided on straight lines in the radial direction passing through the center of the opening 21. The heat insulating materials 3 are epoxy glass mats, and the planar shape is a long rectangle. Specifically, the heat insulating materials 3 extend on straight lines which connect the center of the opening 21 and the midpoint of one side at a position of the outer periphery of the main body 2, and are arranged every one side. That is, on the upper surface 2a of the main body 2 at a position outside the opening 21, a total of six heat insulating materials 3 are arranged at equal intervals in the circumferential direction of the opening 21. The heat insulating materials 3 are fastened to the main body 2 by bolts and nuts. A portion of the positioning portion of the injection mold which is described later and which is loaded on the transport tray 1 at the time of molding is located at a portion of the upper surface 2a of the main body 2, and the portion of the upper surface 2a is at a position between one end edge of the heat insulating materials 3 on the opening 21 side and the outer periphery of the opening 21.

[0017] Further, in the transport tray 1, at the outer peripheral end portion of the upper surface 2a of the main body 2 and at a portion where the heat insulating materials 3 are not provided, a pair of handles 4, 4 are provided in opposition. The handles 4, 4 are fastened to the main body 2 by bolts and nuts. Further, in the handles 4, 4, the portions 41 which are hooked and suspended by hooks and the like of a suspension device such as a jib crane are located at positions further outside than the outer periphery of the main body 2, and the stator for motor does not come into contact with the handles 4, 4 at the time of loading the stator for motor on the transport tray 1 or taking the stator for motor out of the transport tray 1.

[0018] Although the transport tray 1 conveys the stator for motor while being mounted on the conveyer, the transport tray 1 also conveys the injection mold at the time of molding. Reference Signs List Figure 2The state of conveyance at this time will be described. The motor stator 5 has a core portion 51 formed by stacking a plurality of annular electromagnetic steel sheets, a coil 52 wound around a plurality of slots 51a formed at regular intervals in the inner circumferential portion of the core portion 51, and a cylindrical frame 53. The core portion 51 is inserted into the frame 53 by shrink fitting or the like.

[0019] The injection mold 6 is a hollow mold made of aluminum or the like, and has a long and cylindrical main body portion 61 and a flange portion 62 extending outward from one end of the main body portion 61 in the longitudinal direction. When the motor stator 5 is placed on the conveyance tray 1, the injection mold 6 is arranged with the flange portion 62 horizontally and the main body portion 61 upward. Further, the main body portion 61 of the injection mold 6 is inserted into the core portion 51, and one end of the frame 53 in the longitudinal direction is placed on the flange portion 62 of the injection mold 6. In this state, by placing the injection mold 6 on the heat insulating material 3 of the conveyance tray 1, the motor stator 5 is also placed on the conveyance tray 1.

[0020] Here, a positioning portion 63 is provided protruding at one end of the flange portion 62 of the main body portion 61 of the injection mold 6. The positioning portion 63 protrudes toward the inner side in the radial direction of the main body portion 61, and is bent toward the lower side of the flange portion 62, and is provided in the entire circumferential range of the inner periphery of the main body portion 61. In this positioning portion 63, when the injection mold 6 is placed on the heat insulating material 3 of the conveyance tray 1, a part of the positioning portion 63 is positioned between the end edge of the upper surface 2a of the main body 2 on the side of the opening 21 of the heat insulating material 3 and the outer periphery of the opening 21, and the remaining part is loosely fitted to the inner periphery of the opening 21 of the main body 2. The position of the injection mold 6 and the motor stator 5 on the conveyance tray 1 is determined by this positioning and loose fitting of the positioning portion 63. In addition, the heat insulating material 3 is arranged at equal intervals along the circumferential direction of the opening 21, so the total weight of the motor stator 5 and the injection mold 6 can be equally borne by each heat insulating material 3, and the state of placement of the motor stator 5 and the injection mold 6 on the conveyance tray 1 becomes stable. Further, the positioning portion 63 can not be provided in the entire circumferential range of the main body portion 61, but can be formed in an arc shape and provided at a plurality of intervals along the circumferential direction of the main body portion 61.

[0021] The stator 5 for motor, which is loaded together with the injection mold 6 on the transport tray 1, is carried on the conveyer and is sequentially carried to the preheating station, the resin injection station, the resin solidification station, and the cooling station, which are arranged from the upstream side to the downstream side of the production line, to perform the mold molding. In the preheating station, the coil 52 is supplied with an alternating current from an alternating current power source, and the coil 52 generates heat at the time of power supply, and the heat is transmitted to the core 51 and the frame 53, the main body 61 and the flange 62 of the injection mold 6. As described above, since the injection mold 6 is loaded on the heat insulating material 3 of the transport tray 1, the heat insulating material 3 is interposed between the injection mold 6 and the main body 2 of the transport tray 1. By the interposition of the heat insulating material 3, it is possible to suppress the case where the heat for heating the stator 5 for motor at the time of mold molding is transmitted to the main body 2 of the transport tray 1 through the injection mold 6, and it is possible to suppress the heat loss at the time of preheating.

[0022] After the preheating, once the transport tray 1 is carried to the resin injection station, the molten insulating resin is injected and filled into the inner cavities 7a, 7b formed at both ends in the longitudinal direction of the main body 61 at the position between the frame 53 of the stator 5 for motor and the injection mold 6. At this time, the resin is also injected into the gap between the core 51 and the coil 52, or the gap between the coils 52, and the like. Further, after the filling of the insulating resin is completed, the transport tray 1 is carried to the resin solidification station. In the resin solidification station, the same heating process as in the preheating station is performed, and the stator 5 for motor is heated together with the injection mold 6 to a temperature at which the insulating resin is solidified. Also at the time of heating in the resin solidification station, as in the preheating described above, it is possible to suppress the heat loss. Accordingly, it is also possible to shorten the heating time in the resin solidification station, and it is possible to shorten the total heating time taken for the mold molding of the stator 5 for motor.

[0023] Further, after the insulating resin is solidified, once the transport tray 1 is carried to the cooling station, a refrigerant such as air is blown from the outside of the frame 53 toward the frame 53. In addition, since the main body 61 of the injection mold 6 is hollow, and the opening 21 is formed in the main body 2 of the transport tray 1, it is also possible to make the refrigerant such as air flow through the hollow portion 6a of the main body 61 and the opening 21. That is, it is possible to make the refrigerant such as air flow from the hollow portion 6a toward the opening 21, or from the opening 21 toward the hollow portion 6a. In this way, the stator 5 for motor can be cooled not only from the outside but also from the inside, and it is also possible to achieve the shortening of the cooling time.

[0024] Further, in the transport tray 1, the heat insulating material 3 is not provided on the entire surface of the upper surface 2a, but is provided along the radial direction passing through the center of the opening 21, and thus it is possible to reduce the material cost and the like required for manufacturing the heat insulating material 3, and it is advantageous for the cost reduction of the transport tray 1.

[0025] The above describes an embodiment of the present application, but the present application is not limited to the above-described embodiment. For example, the planar shape of the main body 2 and the opening 21 of the transport pallet 1 can be arbitrary, and the planar shape and the number of the heat insulating material 3 provided at the upper surface 2a of the main body 2 can also be arbitrary. In addition, the material of the main body 2 and the heat insulating material 3 is not particularly limited. Furthermore, the main body portion 61 of the injection mold 6, which is inserted into the core portion 51, can be solid. In this case, the refrigerant such as air sent from the opening 21 cools the bottom of the main body portion 61, and a gap is formed between the main body 2 of the transport pallet 1 and the flange portion 62 by the heat insulating material 3, so the refrigerant such as air can flow in the gap to cool the flange portion 62, thereby cooling the injection mold 6.

Claims

1. A conveyor tray for a motor stator, wherein a motor stator having a core, a coil, and a cylindrical frame is conveyed together with an injection mold on a conveyor while the main body of an injection mold having a long body and a flange is inserted into the core, and one end of the frame in the long side direction is placed on the flange of the injection mold, wherein... The core is formed by stacking multiple annular electromagnetic steel plates. The coil is wound around multiple slots formed at predetermined intervals on the inner periphery of the core. The core is embedded in the frame. The flange extends outward from one end of the long side of the main body. Its features are, The conveyor tray for the motor stator comprises: a flat body placed on a conveyor. An opening is provided in the center of the main body, extending vertically. Furthermore, on the upper surface of the main body located outside the opening, a plurality of heat-insulating materials are provided at intervals along a radial line passing through the center of the opening. With the flange of the injection mold resting on the heat insulation material, one end of the main body of the injection mold facing the opening along its long side. A positioning portion is provided at one end of the flange portion of the main body. The positioning portion protrudes radially inward toward the main body and bends downward toward the flange portion. It is provided within the entire circumference of the inner periphery of the main body. A portion of the positioning portion is located on the upper surface of the main body between the end edge of the opening on the side of the heat insulation material and the outer periphery of the opening. The remaining portion of the positioning portion is loosely embedded in the inner periphery of the opening of the main body.

2. The conveyor tray for a motor stator according to claim 1, wherein, The thermal insulation material is arranged at equal intervals along the circumference of the opening.

Images