KR-20260066325-A - ROTOR FOR PERMANENT MAGNETIC ROTATING MACHINE AND METHOD FOR MANUFACTURING THE SAME

Abstract

The present invention relates to a rotor of a permanent magnet rotor and a method for manufacturing the same. The method for manufacturing the rotor comprises the steps of: preparing a plurality of dividing plates by forming an electrical steel sheet into a predetermined shape; drilling magnet insertion holes in the dividing plates; stacking and joining the plurality of dividing plates to form a plurality of dividing cores; and connecting and joining the plurality of dividing cores to form a rotor core. In the dividing plates, welding grooves are formed, and when the plurality of dividing plates are stacked and joined, the welding grooves are aligned to form a welding channel, and welding can be performed along the welding channel.

Inventors

• 권도윤

Assignees

• 에이치디현대일렉트릭 주식회사

Dates

Publication Date

20260512

Application Date

20241104

Claims (8)

1. A step of preparing a plurality of divided plates by forming an electrical steel sheet into a predetermined shape; A step of drilling a magnet insertion hole in the above-mentioned dividing plate; A step of stacking and joining a plurality of the above-mentioned dividing plates to form a plurality of dividing cores; and A step of connecting and joining a plurality of the above-mentioned split cores to form a rotor core. Includes, A welding groove is formed in the above-mentioned dividing plate, and A method for manufacturing a rotor in which, when a plurality of the above-mentioned dividing plates are stacked and joined, the welding grooves are aligned to form a welding channel, and welding is performed along the welding channel.
2. In paragraph 1, The above dividing plate is, A first straight section and a second straight section extending radially from the rotor, An inner diameter portion connecting ends that are relatively close to each other in the first straight portion and the second straight portion, parallel to the circumferential direction of the rotor, and An outer diameter section connecting the other ends, which are relatively far apart from each other in the first straight section and the second straight section, parallel to the circumferential direction of the rotor. A method for manufacturing a rotor including
3. In paragraph 2, A groove is formed in the first straight section, and a projection having a position and shape corresponding to the groove is formed in the second straight section. The above welding groove is formed in each of the above groove portion and the above projection. A method for manufacturing a rotor.
4. In paragraph 3, A method for manufacturing a rotor in which, when the straight distance from the center where the first straight section and the second straight section are extended radially inward and intersect the rotor to the inner diameter section is defined as the radius, the groove section and the projection are located at a distance extended from the center by 1.2 to 1.5 times the radius.
5. In paragraph 3, When a plurality of the above-mentioned dividing plates are stacked, the grooves are aligned to form connecting grooves, and the protrusions are aligned to form connecting protrusions. When connecting and joining a plurality of the above-mentioned split cores, the connecting projection formed on one of the above-mentioned split cores is inserted into the connecting groove formed on another of the above-mentioned split cores to form a shape match, and A method for manufacturing a rotor in which welding is performed along the contact line between contacted split cores.
6. In paragraph 1, A method for manufacturing a rotor, further comprising the step of storing a plurality of the above-mentioned dividing plates after forming the above-mentioned dividing plates.
7. Rotor core and, A plurality of permanent magnets inserted into the rotor core above Includes, The above rotor core is a rotor made by a manufacturing method according to any one of claims 1 to 6.
8. In Paragraph 7, The rotor core is formed by connecting and joining a plurality of segmented cores along the circumferential direction of the rotor, and The above-mentioned split core is a rotor formed by stacking and joining a plurality of the above-mentioned split plates in a number corresponding to the total axial length of the rotor core.

Description

Rotor for Permanent Magnet Rotating Machine and Method for Manufacturing the Same The present invention relates to a rotor of a permanent magnet rotor capable of reducing manufacturing time and manufacturing costs, and a method for manufacturing the same. The rotors of permanent magnet machines are classified into surface permanent magnet type rotors and interior permanent magnet type rotors depending on the attachment location and manufacturing method of the permanent magnets. A surface permanent magnet type rotor has a structure in which the permanent magnets are attached to the surface of the rotor and are exposed, while an interior permanent magnet type rotor has a structure in which the permanent magnets are embedded inside the rotor and are not visible from the outside. Permanent magnet motors equipped with suitable rotor types can be selected based on load characteristics. For example, permanent magnet motors with embedded rotors offer advantages such as a wide operating range and characteristics favorable for high-speed operation. Furthermore, due to the high degree of design freedom for rotor cores, rotors with various shapes are being developed. However, maximizing characteristics such as high output and high-speed operation requires a complex rotor shape, which in turn increases manufacturing costs due to the intricate geometry of the rotor core. Furthermore, since prototype verification during the R&D phase must handle various cases and time reduction is critical, it is necessary to reduce the manufacturing time of rotor prototypes with complex shapes. (Patent Document 1) CN 103516083 B FIG. 1 is a cross-sectional view schematically illustrating a permanent magnet rotor to which a rotor according to the present invention is applied. FIG. 2 is a front view illustrating a rotor according to the present invention. FIG. 3 is a flowchart illustrating a method for manufacturing a rotor according to the present invention. Figure 4 is a front view illustrating a dividing plate. Figure 5 is a front view illustrating a divided core. The present invention is described in detail below with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. FIG. 1 is a cross-sectional view schematically illustrating a permanent magnet rotor to which a rotor according to the present invention is applied, and FIG. 2 is a front view illustrating a rotor according to the present invention. As shown in FIGS. 1 and 2, a permanent magnet rotor may include a stator (10), a rotor (20), and a shaft (30). The stator (10) may include a stator core (11) and a coil (12) wound on the stator core. The stator may be formed in a shape through which a shaft (30) can pass and may be fixedly supported in the housing (not shown) of the rotor. However, the fixing and placement relationship of the stator (10) is not necessarily limited to the example described above, and for example, the shaft (30) may be fixed and the stator may be fixedly coupled to the outer surface of the shaft. The stator core (11) may be formed by stacking a plurality of stator core plates formed by molding electrical steel sheets into a predetermined shape. The stator core (11) may include a rotor receiving hole (13) formed by extending axially so that a rotor (20) can be received in the center. Additionally, the stator core (11) may include a plurality of slots (not shown) and a plurality of poles (not shown) formed alternately around the circumference of the rotor receiving hole (13). A plurality of poles may be arranged at equal intervals along the circumferential direction of the stator core, and a slot may be formed between two adjacent poles. The coil (12) can be wound around the pole in both slots, and the stator (10) can be formed by winding the coil around each pole. The rotor (20) may include a rotor core (21) and a plurality of permanent magnets (22) inserted into the rotor core. The rotor may be fixedly coupled to the outer surface of the shaft with the shaft (30) passing through it, and may be received in the rotor receiving hole (13) of the stator (10) and rotated together with the shaft. In this case, the shaft (30) rotates together with the rotor (20) and can transmit the rotational force of the rotor to the outside or receive it from the outside. To this end, the rotor core (21) may include a shaft insertion hole (23) formed by extending axially so that a shaft (30) can be inserted into the center. For example, the rotor core may be formed in an annular shape, and a shaft may be inserted and passed through the inner circumference of the rotor core, i.e., the shaft insertion hole. However, the arrangement of the rotor (20) is not necessarily limited to the example described above, and, for example, the stator (10) may be fixedly coupled to the outer surface of the sha