JP2014239598A - Rotor manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor manufacturing apparatus which effectively cools a rotor assy thereby shortening the cooling time.SOLUTION: A rotor manufacturing apparatus cools a rotor assy, in which a hollow shaft is inserted into a through hole formed at a rotor core composed of laminated steel plates, thereby fixing a shaft and a rotor core to each other. The rotor manufacturing apparatus includes: an inner cooling jig which is inserted into a hollow hole of the shaft to be placed therein and supplies a gas serving as a cooling medium toward an inner surface of the shaft that faces the rotor core in a radial direction; and an outer cooling jig which is disposed at the outer side of the rotor core and supplies a gas serving as a cooling medium toward an outer surface of the rotor core.

Description

  The present invention relates to a rotor manufacturing apparatus suitable for fixing a shaft and a rotor core to each other by cooling a rotor assembly in which a hollow shaft is inserted into a through hole formed in a rotor core made of laminated steel plates.

  2. Description of the Related Art Conventionally, a manufacturing apparatus that cools motor components is known (see, for example, Patent Document 1). This manufacturing apparatus includes a blower fan. The blower fan blows mist toward the surface of the motor component. When the mist is sprayed, the motor components are uniformly and efficiently cooled by the heat of vaporization of the mist.

JP 2010-131774 A

  Incidentally, as a component of the motor, there is a rotor assembly in which a hollow shaft is inserted into a through hole formed in a rotor core made of laminated steel plates. In the manufacturing stage of the rotor assembly, first, the diameter of the through hole is increased by heating the rotor core, and then the shaft is inserted into the through hole, and then the diameter of the through hole is decreased by cooling the rotor assembly. The rotor core is fixed to each other. If the cooling of the rotor assembly is realized by blowing mist onto the rotor assembly surface by a blower fan as in the technique described in Patent Document 1, the cooling time is shortened, but depending on the type of mist, the rotor assembly Rust may occur. In order to cope with this, it is possible to adopt a mist that does not generate rust, but such a mist is disadvantageous in terms of cost.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a rotor manufacturing apparatus capable of efficiently cooling a rotor assembly while suppressing generation of rust.

  The above object is a rotor manufacturing apparatus for fixing the shaft and the rotor core to each other by cooling a rotor assembly in which a hollow shaft is inserted into a through hole formed in a rotor core made of a laminated steel plate, An inner cooling jig that is inserted into a hollow hole of the shaft and supplies a gas as a cooling medium toward an inner surface of the shaft that is radially opposed to the rotor core; and an outer cooling jig that is disposed outside the rotor core. And an outer cooling jig for supplying a gas as a cooling medium toward the outer surface.

  According to the present invention, efficient cooling of the rotor assembly can be performed while suppressing the generation of rust.

It is a block diagram of the rotor manufacturing apparatus which is one Example of this invention. It is a block diagram of the rotor assembly manufactured by the rotor manufacturing apparatus of a present Example. It is a block diagram of the cooling jig with which the rotor manufacturing apparatus of a present Example is provided. It is a figure for demonstrating the cooling method of the rotor assembly by the cooling jig with which the rotor manufacturing apparatus of a present Example is provided. It is a figure for demonstrating the cooling method of the rotor assembly by the cooling jig with which the rotor manufacturing apparatus of a present Example is provided. It is a figure showing the air blowing direction of the cooling jig with which the rotor manufacturing apparatus which is a modification of this invention is provided.

  Hereinafter, specific embodiments of a rotor manufacturing apparatus according to the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration diagram of a rotor manufacturing apparatus 10 according to an embodiment of the present invention. FIG. 2 shows a configuration diagram of the rotor assembly 12 manufactured by the rotor manufacturing apparatus 10 of the present embodiment. Moreover, FIG. 3 shows the block diagram of the two cooling jigs 14 and 16 with which the rotor manufacturing apparatus 10 of a present Example is provided. FIG. 3A shows a configuration diagram of one cooling jig 12, and FIG. 3B shows a configuration diagram of the other cooling jig 14. FIG.

  In this embodiment, the rotor manufacturing apparatus 10 is an apparatus that manufactures a rotor assembly 12 used in a rotating electrical machine such as a three-phase AC motor. The rotor assembly 12 is a member that can rotate about an axis with respect to the stator. The rotor assembly 12 includes a shaft 20 that extends in the axial direction and a rotor core 22 that is disposed on the outer peripheral side of the shaft 20. The shaft 20 is a cylindrical member formed in a hollow shape having a hollow hole 24 penetrating in the axial direction. The rotor core 22 is a member formed by laminating a plurality of insulating coated steel sheets in the axial direction.

  A circular through hole 26 into which the shaft 20 is inserted is formed at the axial center of the rotor core 22. The through hole 26 is opened at the axial center of each electromagnetic steel plate of the rotor core 22. The through hole 26 has substantially the same diameter as the outer diameter of the shaft 20 at room temperature. The shaft 20 is inserted into the through hole 26 of the rotor core 22. The rotor assembly 12 is assembled so that the shaft 20 and the rotor core 22 are integrated by fixing the shaft 20 and the rotor core 22 to each other in a state where the shaft 20 is inserted into the through hole 26 of the rotor core 22.

  The shaft 20 and the rotor core 22 in the rotor assembly 12 are fixed by inserting the shaft 20 into the through hole 24 after the diameter of the through hole 26 is increased by heating the rotor core 22, and then inserting the shaft into the through hole 26. This is realized by reducing the diameter of the through-hole 26 by cooling the rotor core 22 in which 20 is inserted.

  The rotor manufacturing apparatus 10 includes cooling jigs 14 and 16 for cooling the rotor assembly 12 in which the shaft 20 is inserted into the through hole 26 of the rotor core 22. The cooling jigs 14 and 16 have a role of fixing the shaft 20 and the rotor core 22 to each other by cooling the rotor assembly 12.

  The cooling jig 14 is an inner cooling jig that cools the rotor assembly 12 from the inner peripheral side. Hereinafter, the cooling jig 14 is referred to as an inner cooling jig 14. The inner cooling jig 14 is a member formed in a round bar shape that is inserted into the hollow hole 24 of the shaft 20 when the rotor assembly 12 is manufactured. The inner cooling jig 14 has, for example, a copper pipe 30 formed in a cylindrical shape extending linearly in the axial direction, and an air blowing hole 32 opened in the wall surface of the pipe 30.

  The pipe 30 is configured to have an outer diameter smaller than the inner diameter of the hollow hole 24 of the shaft 20. A plurality of air blowing holes 32 are provided in the pipe 30. The air blowing holes 32 are formed on the wall surface of the pipe 30 at a predetermined angle (for example, 90 °) around the rotor axis, and are formed at predetermined intervals in the axial direction.

  The inner cooling jig 14 is supplied with compressed air for cooling the rotor assembly 12. The temperature of the compressed air supplied to the inner cooling jig 14 is set to a temperature lower than the atmospheric temperature (normal temperature). The compressed air is supplied from one side of the linear pipe 30 to the other side of the inner cooling jig 14. Part of the compressed air is discharged from the inside of the pipe 30 to the outside of the pipe 30 through the air blowing holes 32 in the course of flowing through the pipe 30. The compressed air discharged from the air blowing hole 32 is released from the air pressure and blown to the inner surface of the shaft 20 in the hollow hole 24 (specifically, the inner surface of the shaft 20 facing at least the rotor core 22 in the radial direction).

  The cooling jig 16 is an outer cooling jig that cools the rotor assembly 12 from the outer peripheral side. Hereinafter, the cooling jig 16 is referred to as an outer cooling jig 16. The outer cooling jig 16 is a spiral member that is disposed on the outer peripheral side of the rotor core 22 when the rotor assembly 12 is manufactured. The outer cooling jig 16 has, for example, a copper pipe 34 formed in a cylindrical shape spirally around the rotor axis, and an air blowing hole 36 opened in the wall surface of the pipe 34.

  The pipe 34 is formed in a spiral shape so as to surround the rotor core 22 from the outer peripheral side along the outer periphery of the rotor core 22. A plurality of air blowing holes 36 are provided in the pipe 34. The air blowing holes 36 are formed on the wall surface of the pipe 34 at predetermined angles (for example, 45 °) around the rotor axis. The air blowing hole 36 is formed on the surface of the pipe 34 on the rotor shaft side facing the rotor core 22 and is provided in the pipe 34 so as to face the spiral center.

  The outer cooling jig 16 is supplied with compressed air for cooling the rotor assembly 12. The temperature of the compressed air supplied to the outer cooling jig 16 is set to a temperature lower than the atmospheric temperature (normal temperature). The compressed air is supplied to the outer cooling jig 16 from one side of the spiral pipe 34 toward the other side. Part of the compressed air is discharged from the inside of the pipe 34 to the outside of the pipe 34 through the air blowing holes 36 in the course of flowing through the pipe 34. The compressed air discharged from the air blowing hole 36 is released from the air pressure and blown to the outer peripheral surface of the rotor core 22. The outer cooling jig 16 supplies air over substantially the entire outer peripheral surface of the rotor core 22.

  Next, with reference to FIG.4 and FIG.5, the manufacturing procedure which manufactures the rotor assembly 12 with the rotor manufacturing apparatus 10 of a present Example is demonstrated.

  4 and 5 are views for explaining a cooling method of the rotor assembly 12 by the cooling jigs 14 and 16 included in the rotor manufacturing apparatus 10 of the present embodiment, respectively. 4 shows a cross-sectional view when cut parallel to the rotor shaft, and FIG. 5 shows a cross-sectional view when cut perpendicular to the rotor shaft.

  In this embodiment, in the manufacturing process of the rotor assembly 12, first, the rotor core 22 constituting the rotor assembly 12 is heated to a predetermined temperature higher than the atmospheric temperature (normal temperature). When the rotor core 22 is heated, the diameter of the through hole 26 formed at the axial center of the rotor core 22 becomes larger than the diameter at room temperature.

  As described above, after the diameter of the through hole 26 is increased by heating the rotor core 22, the shaft 20 is inserted into the through hole 26. The outer diameter of the shaft 20 is substantially the same as the diameter of the through hole 26 of the rotor core 22 at room temperature. However, if the diameter of the through hole 26 is increased by heating the rotor core 22 as described above, The shaft 20 can be easily inserted.

  When the shaft 20 is inserted into the through hole 26 of the rotor core 22, the cooling jigs 14 and 16 of the rotor manufacturing apparatus 10 are next applied to the rotor assembly 12 with the shaft 20 inserted into the through hole 26 of the rotor core 22. Is placed. Specifically, the inner cooling jig 14 is inserted and arranged in the hollow hole 24 of the shaft 20, and the outer cooling jig 16 is arranged on the outer peripheral side of the rotor core 22.

  The rotor assembly 12 is set with respect to the rotor manufacturing apparatus 10 so that the rotor shaft is oriented in the vertical direction, and the inner cooling jig 14 has an air inlet located on the upper side in the rotor shaft direction and an air outlet. Is arranged on the lower side in the rotor axial direction, and the outer cooling jig 16 has an air inlet located on the upper side in the rotor axial direction and an air outlet located on the lower side in the rotor axial direction. Placed in.

  When the cooling jigs 14 and 16 are arranged with respect to the rotor assembly 12 in which the shaft 20 is inserted into the through holes 26 of the rotor core 22 as described above, the compressed air is then supplied from the air inlets of the cooling jigs 14 and 16. (Gas) is supplied. When such compressed air is supplied, the compressed air flows through the pipes 30 and 34 of the cooling jigs 14 and 16.

  In the process in which the compressed air flows through the pipe 30 of the inner cooling jig 14, a part of the compressed air is discharged from the air blowing hole 32 to the outside of the pipe 30 as shown by arrows in FIGS. When the compressed air is discharged from the air blowing hole 32 to the outside of the pipe 30, the compressed air is released from the air pressure and blown to the inner surface of the hollow hole 24 of the shaft 20. The temperature of the compressed air is lower than the atmospheric temperature (normal temperature). For this reason, when such blowing is performed, the rotor assembly 12 is cooled from the inner surface side in the hollow hole 24 of the shaft 20.

  Further, in the process in which the compressed air circulates in the pipe 34 of the outer cooling jig 16, a part of the compressed air is discharged to the outside of the pipe 34 from the air blowing hole 36 as shown by arrows in FIGS. The When the compressed air is discharged from the air blowing hole 36 to the outside of the pipe 34, the compressed air is released from the air pressure and blown to the outer peripheral surface of the rotor core 22. The temperature of the compressed air is lower than the atmospheric temperature (normal temperature). For this reason, when such blowing is performed, the rotor assembly 12 is cooled from the outer surface side of the rotor core 22.

  As described above, when the rotor assembly 12 is cooled from the inner surface side of the shaft 20 and the outer surface side of the rotor core 22, the diameter of the through hole 26 formed at the axial center of the rotor core 22 becomes small before and after the cooling is performed. . When the diameter of the through hole 26 is reduced, the shaft 20 inserted into the through hole 26 is fixed to the rotor core 22. Therefore, according to the rotor manufacturing apparatus 10 of the present embodiment, the rotor 20 having the shaft 20 inserted into the through hole 26 after cooling is cooled by using the cooling jigs 14 and 16, so that the shaft 20 and the rotor core 22 are Can be manufactured.

  The portion on the inner diameter side of the rotor assembly 12 (that is, the inside of the hollow hole 24 of the shaft 20 or the inner surface side of the rotor core 22) is more likely to accumulate heat than the outer diameter side of the rotor assembly 12 (ie, the outer surface side of the rotor core 22). It is. For this reason, if the rotor assembly 12 is cooled only from the outer diameter side using the outer cooling jig 16, the rotor assembly 12 becomes difficult to be cooled, and the cooling time may be long.

  On the other hand, in the rotor manufacturing apparatus 10 of the present embodiment, the cooling of the rotor assembly 12 for fixing the shaft 20 and the rotor core 22 to each other is performed by using the outer cooling jig 16 disposed on the outer peripheral side of the rotor core 22. It is performed from the outer surface side of the rotor core 22 and at the same time from the inner surface side of the shaft 20 using the inner cooling jig 14 inserted and disposed in the hollow hole 24 of the shaft 20.

  In this regard, according to the rotor manufacturing apparatus 10 of the present embodiment, the rotor assembly 12 can be cooled not only from the outer surface side of the rotor core 22 but also from the inside of the hollow hole 24 of the shaft 20. Cooling can be realized. Therefore, according to the rotor manufacturing apparatus 10 of the present embodiment, the rotor assembly 12 that is necessary for fixing the shaft 20 and the rotor core 22 to each other is compared with the case where the rotor assembly 12 is cooled only from the outer surface side of the rotor core 22. The cooling time for cooling 12 can be shortened.

  By the way, the pressure of the compressed air discharged from the air blowing holes 32 and 36 in the process in which the compressed air flows through the pipe 30 of the inner cooling jig 14 or the pipe 34 of the outer cooling jig 16 is It decreases in order from the air blowing holes 32 and 36 on the most upstream side to the air blowing holes 32 and 36 on the most downstream side. When the pressure of the compressed air discharged from the air blowing holes 32 and 36 is low, the force with which the compressed air is blown to the inner surface of the hollow hole 24 of the shaft 20 is small. It will decline.

  On the other hand, in the rotor manufacturing apparatus 10 of the present embodiment, as described above, the rotor assembly 12 is set with respect to the rotor manufacturing apparatus 10 so that the rotor shaft faces the vertical direction, and the inner cooling jig is used. 14 is arranged such that the air inlet is located on the upper side in the rotor axial direction and the air outlet is located on the lower side in the rotor axial direction, and the outer cooling jig 16 is arranged so that the air inlet is the upper side in the rotor axial direction. The air outlet is located on the lower side in the rotor axial direction.

  In such a structure, the compressed air discharged from the air blowing holes 32 and 36 of the cooling jigs 14 and 16 strikes the inner surface of the shaft 20 of the rotor assembly 12 and the outer surface of the rotor core 22, and then follows the surfaces by gravity. Flows downward in the rotor axial direction. In this case, air is directly supplied from the air blowing holes 32 and 36 to the lower side in the axial direction of the rotor assembly 12 facing the downstream side of the pipe where the pressure of the compressed air discharged from the air blowing holes 32 and 36 is low. Furthermore, air flowing along the side surface from the upper side in the axial direction is further supplied by the gravitational action. Therefore, according to the rotor manufacturing apparatus 10 of the present embodiment, the pressure of the compressed air discharged from the air blowing holes 32 and 36 of the cooling jigs 14 and 16 is as low as the air blowing holes 32 and 36 on the downstream side of the pipe. Moreover, it can suppress that the cooling performance with respect to the axial direction lower part side of the rotor assembly 12 falls.

  Further, in the rotor manufacturing apparatus 10 of the present embodiment, the cooling medium for cooling the rotor assembly (at least the rotor core 22) used in the cooling jigs 14 and 16 is compressed air, so the rotor assembly 12 is cooled and manufactured. In addition, liquids containing mist are not used. For this reason, according to the present Example, the rust prevention property in cooling and manufacturing the rotor assembly 12 can be ensured.

  Furthermore, in the rotor manufacturing apparatus 10 of the present embodiment, the inner cooling jig 14 that cools from the hollow hole 24 side of the shaft 20 extends linearly in the rotor axial direction, and from an air inlet on one side in the rotor axial direction. It consists of piping 30 which supplies compressed air toward the air outlet of the other side. The outer cooling jig 16 that cools the rotor assembly 12 from the outer peripheral side extends spirally around the rotor shaft disposed on the outer peripheral side of the rotor core 22 and extends from the air inlet on one side in the rotor axial direction to the other side. It consists of piping 34 which supplies compressed air toward the air outlet.

  For this reason, according to the present embodiment, it is possible to simplify the facility for supplying the compressed air toward the rotor assembly 12 and to prevent the device for cooling the rotor assembly 12 from becoming enlarged and complicated. .

  In the above embodiment, the air blowing holes 32 and 36 are the “holes” recited in the claims, and the compressed air having a temperature lower than the atmospheric temperature is the “cooling medium” and the claims. Each corresponds to “gas”.

  By the way, in the above embodiment, the outer cooling jig 16 that cools the rotor assembly 12 from the outer peripheral side is a single member that spirally extends around the rotor axis that is disposed on the outer peripheral side of the rotor core 22. However, the present invention is not limited to this, and a plurality of members extending linearly in the rotor axial direction are prepared as the outer cooling jig 16, and the members are arranged at predetermined angles around the rotor shaft. It may be a thing.

  Further, in the above embodiment, the outer cooling jig 16 is formed with the air blowing hole 36 for blowing the compressed air to the outer surface of the rotor core 22. It may be provided in the spiral pipe 34 so as to be discharged in an orthogonal direction (that is, in the horizontal direction), and the compressed air is inclined from the air inlet side to the air outlet side with respect to the rotor shaft. You may provide in the spiral piping 34 so that it may discharge in a direction (namely, diagonally downward with respect to horizontal).

  As shown in FIG. 6, in a structure in which compressed air from the air blowing hole 36 is discharged in an oblique direction from the air inlet side to the air outlet side with respect to the rotor shaft, the outer peripheral surface of the rotor core 22 from the air blowing hole 36. The flow of compressed air blown to the rotor in the axial direction of the rotor (specifically, the axial direction from the air inlet side to the air outlet side) along the outer peripheral surface of the rotor core 22 (shown by broken line arrows in FIG. 6). ) Is easily formed. Therefore, according to such a modification, even if the pressure of the compressed air discharged from the air blowing hole 36 of the outer cooling jig 16 is as low as the air blowing hole 36 on the downstream side of the pipe, the lower side in the axial direction of the rotor assembly 12 It becomes possible to suppress that the cooling performance with respect to this falls.

  In the above embodiment, the air blowing holes 36 are formed in the pipe 34 of the outer cooling jig 16 at predetermined angles (for example, 45 °) around the rotor axis, and the air is supplied to the pipe 30 of the inner cooling jig 14. The blowing holes 32 are formed at predetermined angles (for example, 90 °) around the rotor axis. However, the present invention is not limited to this, and the air blowing holes 36 of the outer cooling jig 16 and the air blowing holes 32 of the inner cooling jig 14 are formed at the same angle around the rotor axis. Alternatively, it may be formed at different angles. Further, the air blowing holes 32 of the inner cooling jig 14 may be formed at predetermined intervals in the rotor axial direction, and if the inner surface in the hollow hole 24 of the shaft 20 can be uniformly cooled around the rotor axis, Only one air blowing hole 32 of the inner cooling jig 14 may be formed in the direction around the rotor axis.

  Furthermore, in the above-described embodiment, the rotor assembly 12 is set with respect to the rotor manufacturing apparatus 10 so that the rotor shaft is oriented in the vertical direction, and the cooling jigs 14 and 16 are disposed above the air inlet in the rotor shaft direction. The air outlet is located on the lower side in the rotor axial direction. However, the present invention is not limited to this, and the rotor assembly 12 may be set with respect to the rotor manufacturing apparatus 10 such that the rotor axial direction is in the horizontal direction. The cooling jigs 14 and 16 may be arranged so that the air inlet is located on the lower side in the rotor axial direction and the air outlet is located on the upper side in the rotor axial direction.

DESCRIPTION OF SYMBOLS 10 Rotor manufacturing apparatus 12 Rotor assembly 14 Inner cooling jig 16 Outer cooling jig 20 Shaft 22 Rotor core 24 Hollow hole 30, 34 Piping 32, 36 Air blowing hole

Claims (7)

A rotor manufacturing apparatus for fixing the shaft and the rotor core to each other by cooling a rotor assembly in which a hollow shaft is inserted into a through hole formed in a rotor core made of laminated steel plates,
An inner cooling jig that is inserted into a hollow hole of the shaft and supplies a gas as a cooling medium toward an inner surface of the shaft facing the rotor core in a radial direction;
An outer cooling jig that is disposed outside the rotor core and supplies a gas as a cooling medium toward the outer surface of the rotor core;
A rotor manufacturing apparatus comprising:   The rotor manufacturing apparatus according to claim 1, wherein the outer cooling jig supplies the gas over substantially the entire outer surface of the rotor core.   The said outer side cooling jig has a cylindrical piping extended toward the other side from the one side of a rotor axial direction, and the hole which the said gas opened to this piping discharges. Rotor manufacturing equipment.   4. The rotor manufacturing apparatus according to claim 3, wherein the gas flows in the pipe from an inlet on one side to an outlet on the other side in the rotor axial direction.   The rotor manufacturing apparatus according to claim 4, wherein the pipe is formed in a spiral shape so as to surround the rotor core from an outer peripheral side.   The rotor manufacturing apparatus according to claim 5, wherein the hole is formed in the pipe so as to face the other side in the rotor axial direction.   2. The rotor manufacturing apparatus according to claim 1, wherein the inner cooling jig includes a cylindrical pipe extending linearly in a rotor axial direction and a hole through which the gas opened in the pipe is discharged.

Images