KR-20260066341-A - rotor and motor having the same

KR20260066341AKR 20260066341 AKR20260066341 AKR 20260066341AKR-20260066341-A

Abstract

The present invention provides a rotor capable of increasing manufacturability and ensuring structural stability while improving the output and efficiency of a motor, comprising: segmented cores arranged in a circumferential direction and interconnected, each having teeth and a magnet insert; a coil assembled to the teeth and to which current is optionally applied; and a magnet mounted on the magnet insert.

Inventors

허태관
이정석
송준영
임명섭
김기오
황윤재
이지훈
원윤재

Assignees

현대자동차주식회사
기아 주식회사
한양대학교 산학협력단

Dates

Publication Date: 20260512
Application Date: 20241104

Claims (10)

Split cores that are arranged in a circumferential direction and interconnected, each equipped with a tooth and a magnet insert; A coil assembled to the above teeth and to which current is optionally applied; and A magnet mounted on the above magnet insertion part; A rotor including
In claim 1, The above-mentioned split cores are divided into a first split core and a second split core that are alternately arranged in the circumferential direction, and On the side of the first split core, a first male coupling part for being pressed into a second female coupling part and a first female coupling part for being pressed into a second male coupling part are formed and spaced apart in the radial direction. A rotor characterized by having a second male coupling part and a second female coupling part formed on the side of the second split core and spaced apart in the radial direction.
In claim 2, A rotor characterized in that the first male coupling part is formed protrudingly on the outer diameter side of the first split core, and the first female coupling part is formed recessedly on the inner diameter side of the first split core.
In claim 2, A rotor characterized in that the second male coupling part is formed protrudingly on the inner diameter side of the second split core, and the second female coupling part is formed recessed on the outer diameter side of the second split core.
In claim 1, A rotor characterized in that the first split core is divided into two based on the outer end of the first tooth and is composed of a first inner core and a first outer core disposed radially outside the first inner core.
In claim 5, A rotor characterized in that either a third male coupling part or a third female coupling part is provided at the outer end of the first tooth, and the other of the third male coupling part or the third female coupling part is provided at the inner diameter portion of the first outer core and is coupled to either one provided at the outer end of the first tooth.
In claim 1, A rotor characterized in that the second split core is divided into two based on the outer end of the second tooth and consists of a second inner core and a second outer core disposed radially outside the second inner core.
In claim 7, A rotor characterized in that either a fourth male coupling part or a fourth female coupling part is provided at the outer end of the second tooth, and the other of the fourth male coupling part or the fourth female coupling part is provided at the inner diameter of the second outer core and coupled with either one provided at the outer end of the second tooth.
In claim 1, A rotor characterized in that the magnet insertion portion is divided into a first magnet insertion portion formed axially through the center of the outer diameter portion of the split core and a second magnet insertion portion formed in a recess on the side of the split core.
A motor comprising a rotor according to any one of claims 1 to 9.

Description

Rotor and motor having the same The present invention relates to a rotor and a motor including the same, and more specifically, to a rotor designed to increase manufacturability and secure structural stability while improving the output and efficiency of the motor. Generally, electric vehicles, including hybrid electric vehicles, are driven by motors either partially or wholly. Interior Permanent Magnet Synchronous Motors (IPMSMs) utilizing permanent magnets are used as the motors for these electric vehicles. However, while IPMSMs are characterized by high efficiency and output, there is a cost issue regarding the rare earth elements used as permanent magnets. Meanwhile, wound field synchronous motors (WFSMs) have the advantage of eliminating the cost problem of permanent magnets, and as a result, active research is being conducted on them. A conventional wound-field synchronous motor (WFSM) consists of a stator and a rotor positioned inside the stator, but unlike the rotor of a permanent magnet synchronous motor, a coil is applied to the rotor. The rotor of a wound-field synchronous motor consists of a rotor core and rotor coils wound on the teeth of the rotor core, and the magnetic field of the rotor is controlled by controlling the current applied to the rotor coils. In such a wound-field synchronous motor, the magnetic field of the rotor interacts with the alternating current of the stator to rotate synchronously. However, conventional WFSMs have the disadvantage of lower output and efficiency compared to general IPMSMs, and therefore, conventional electric vehicles use IPMSMs as drive motors. FIG. 1 is a partial cross-sectional view illustrating a rotor according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view illustrating a rotor according to another embodiment of the present invention. FIG. 3 is a partial cross-sectional view illustrating a motor including a rotor according to an embodiment of the present invention. Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The details included in the accompanying drawings are schematic for the purpose of easily explaining the embodiments of the present invention and may differ from the actual implemented form. In this specification, terms such as "first" and "second" may be used to describe various components, but said components are not necessarily limited by said terms. Such terms may be used to distinguish one component from other components. For example, without departing from the scope of rights according to the concept of the present invention, the first component may be named the second component, and the second component may be named the first component. Additionally, in this specification, terms such as "circumferential direction," "radial direction," and "axial direction" are used with respect to the rotor and rotor core unless otherwise noted. As illustrated in FIG. 1, a rotor (1) for a motor according to an embodiment of the present invention includes a rotor core (10) and a magnet (130) and a coil (140) assembled on the rotor core (10). The rotor core (10) comprises a plurality of segmented cores (110, 120) arranged in a circumferential direction, wherein the segmented cores (110, 120) have sides adjacent to each other and are coupled to each other so as to stably maintain the adjacent state of their sides. In order to ensure structural stability so as to withstand rotational stress generated during the operation of the rotor (1), each segmented core (110, 120) has a male coupling part (113, 123) and a female coupling part (114, 124). The above-mentioned split cores (110, 120) have a tooth (102) in which a coil (140) is wound and a magnet insertion part (104) in which a magnet (130) is inserted and mounted. The coil (140) is selectively supplied with current when the rotor (1) is driven, and the magnet (130) is a permanent magnet. In order to improve the output and efficiency of the motor, the present invention is configured such that both a coil (140) and a magnet (130) are mounted on the rotor core (10), and accordingly, manufacturability may be reduced compared to the conventional method, but manufacturability can be increased by dividing the rotor core (10) into a plurality of divided cores (110, 120). Here, the plurality of segmented cores (110, 120) are divided into a first segmented core (110) and a second segmented core (120) that are alternately arranged in the circumferential direction. The first segmented core (110) and the second segmented core (120) have their sides in direct contact with each other and are joined together in a state where their sides are directly adjacent. For mutual coupling of the first split core (110) and the second split core (120), a first male coupling part (113) and a first female coupling part (114) are provided on the side of the first split core (110) and are spaced apart in the radial direction, and a seco