CN-122001163-A - Method for manufacturing rotor for rotating electrical machine and rotor for rotating electrical machine

Abstract

The present invention provides a rotor for a rotating electrical machine, which can reduce the preheating time in a method for manufacturing the rotor for the rotating electrical machine, or which has a structure capable of reducing the preheating time. A method for manufacturing a rotor for a rotating electrical machine includes a step of preparing a rotor core having an annular shape when viewed in the axial direction and having an axial magnet hole and an axial first through hole, an injection step of injecting a first molten material in a molten state by heating into the first through hole, and a magnet arrangement step of injecting a second molten material in a molten state by heating into the magnet hole after the injection step, thereby arranging a permanent magnet in the magnet hole, wherein the magnet arrangement step includes fixing a magnet for the permanent magnet inserted into the magnet hole with solidification of the second molten material or forming a bonded magnet for the permanent magnet in the magnet hole with solidification of the second molten material including a magnet powder.

Inventors

• ADACHI AKIFUMI

Assignees

• 株式会社爱信

Dates

Publication Date

20260508

Application Date

20251031

Priority Date

20241108

Claims (7)

1. 1. A method for manufacturing a rotor for a rotating electrical machine, comprising the steps of: A step of preparing a rotor core having an annular shape when viewed in the axial direction, and having an axial magnet hole and an axial first through hole; An injection step of injecting a first molten material in a molten state by heating into the first through hole, and A magnet arrangement step of injecting a second molten material, which is heated to be molten, into the magnet hole after the injection step, thereby arranging a permanent magnet in the magnet hole, The magnet arrangement step includes fixing the permanent magnet inserted into the magnet hole in association with solidification of the second molten material, or forming a bonded magnet for the permanent magnet in association with solidification of the second molten material including a magnet powder in the magnet hole.
2. 2. The method for manufacturing a rotor for a rotating electrical machine according to claim 1, wherein, The magnet arrangement step is performed in a state in which the temperature of the rotor core is increased due to heat from the first molten material injected in the injection step.
3. 3. The method for manufacturing a rotor for a rotating electrical machine according to claim 1, wherein, The first molten material has a higher melting point than the second molten material.
4. 4. The method for manufacturing a rotor for a rotating electrical machine according to claim 1, wherein, The method also comprises the following steps: a step of preparing an end plate having a second through hole or a bottomed hole in the axial direction, and A setting step of setting the end plate on an axial end surface of the rotor core in such a manner that the second through hole or a bottomed hole of the end plate overlaps the first through hole of the rotor core when viewed in the axial direction, The injection step is performed after the setting step, and the first molten material is introduced into the second through-hole or the bottomed hole.
5. 5. The method for manufacturing a rotor for a rotating electrical machine according to any one of claims 1 to 4, wherein, The rotor core is formed by laminating a plurality of steel plates in the axial direction.
6. 6. A rotor for a rotating electrical machine is provided with: A rotor core having an annular shape when viewed in the axial direction, and having an axial magnet hole and an axial first through hole; A sintered magnet fixed to the magnet hole by a fixing resin or a bonded magnet arranged in the magnet hole, and And a material solidifying portion formed in the first through hole and solidifying the molten material in a molten state by heating.
7. 7. The rotor for a rotating electrical machine according to claim 6, wherein, The rotor core further comprises an end plate disposed on an axial end face of the rotor core and having an axial second through hole or bottomed hole, The first through-hole of the rotor core and the second through-hole or bottomed hole of the end plate overlap as viewed in the axial direction, The material solidified portion is formed continuously in the axial direction in the first through hole and the second through hole or the bottomed hole.

Description

Method for manufacturing rotor for rotating electrical machine and rotor for rotating electrical machine Technical Field The present disclosure relates to a method of manufacturing a rotor for a rotating electrical machine and a rotor for a rotating electrical machine. Background A technique of fixing a permanent magnet in a magnet hole by injecting a molten resin material into the magnet hole of a rotor core is known. Patent document 1 Japanese patent laid-open No. 2008-54376 However, in the injection step of the resin material in the molten state into the rotor core, preheating of the rotor core is required for curing in the case where the resin material is a thermosetting resin, and preheating of the rotor core is required for improving fluidity in the case where the resin material is a thermoplastic resin. As such a preheating method, for example, there is a method of applying heat from the outside (periphery) of the rotor core by a heating device in a state where the rotor core is sandwiched between an upper die and a lower die. However, in the above-described preheating method, heat conduction to the inside of the rotor core is relatively time-consuming, and it is difficult to reduce the preheating time. Disclosure of Invention Accordingly, in one aspect of the present disclosure, it is an object to achieve reduction in warm-up time in a method of manufacturing a rotor for a rotary electric machine, and to provide a rotor for a rotary electric machine having a structure capable of reducing warm-up time. In one aspect, a method for manufacturing a rotor for a rotating electrical machine includes a step of preparing a rotor core having an annular shape as viewed in an axial direction and having an axial magnet hole and an axial first through hole, an injection step of injecting a first molten material in a molten state by heating into the first through hole, and a magnet arrangement step of injecting a second molten material in a molten state by heating into the magnet hole after the injection step, thereby arranging a permanent magnet in the magnet hole, the magnet arrangement step including fixing a magnet for the permanent magnet inserted into the magnet hole with solidification of the second molten material in the magnet hole or forming a bonded magnet for the permanent magnet in the magnet hole with solidification of the second molten material including a magnet powder. In one aspect, according to the present disclosure, a reduction in warm-up time can be achieved in a method of manufacturing a rotor for a rotary electric machine, or a rotor for a rotary electric machine having a structure capable of reducing warm-up time can be provided. Drawings Fig. 1 is a cross-sectional view schematically showing a cross-sectional configuration of a motor of an embodiment. Fig. 2 is a perspective view of the rotor with the end plate and the nut removed. Fig. 3 is a perspective view of the end plate as seen from the axial outside. Fig. 4 is a perspective view of the end plate as seen from the axially inner side. Fig. 5 is a perspective view showing an end plate integrated with a rotor shaft. Fig. 6 is a schematic flow chart showing a flow of an example of a method of manufacturing a rotor. Fig. 7 is a plan view of the workpiece as seen from the end plate side in the axial direction. Fig. 8 is a partial cross-sectional view of a workpiece through a through hole. Fig. 9 is an enlarged view of the portion Q9 in fig. 8. Fig. 10 is an explanatory diagram of the positional relationship between two injection molding machines in the resin injection process with respect to the work on the conveying mechanism. Fig. 11 is an explanatory diagram of the positional relationship between two injection molding machines in the magnet fixing step with respect to the workpiece on the conveying mechanism. Fig. 12 is a schematic flow chart showing a flow of another example of the method of manufacturing the rotor. Description of the reference numerals The rotor core is formed of a resin material (material-cured portion) and includes a rotor core, a magnet hole, a through-hole (first through-hole), a permanent magnet, 35A, 35B, end plates, a 352A through-hole (second through-hole), a bottom hole, and a resin material portion (material-cured portion). Detailed Description Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The dimensional ratios in the drawings are merely examples, and the shapes and the like in the drawings may be partially exaggerated for convenience of explanation. In the drawings, for the sake of convenience of observation, in a portion where a plurality of the same attribute exists, reference numerals are given to only a part of the portions. Fig. 1 is a cross-sectional view schematically showing a cross-sectional configuration of a motor 1 of an embodiment. Fig. 2 is a perspective view of the rotor 30 with the end plate 35A and the nut 36 removed. In fig. 2 and the l