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KR-20260062293-A - electric rotating apparatus

KR20260062293AKR 20260062293 AKR20260062293 AKR 20260062293AKR-20260062293-A

Abstract

The present invention relates to an electric rotating machine, and more preferably, an electric rotating machine according to one embodiment comprises a stator and a rotor disposed inside the stator, wherein the rotor, a plurality of rotor cores rotatably provided about a shaft, a plurality of magnets embedded in the rotor cores and having two ends extending in the axial direction of the rotor cores and protruding outward from the rotor cores, a pair of retainers coupled to the shaft and stacked at both ends of the rotor cores and supporting the two ends of the magnets protruding outward from both ends of the rotor cores, and a middle plate located in an area adjacent to each other where the plurality of rotor cores are adjacent.

Inventors

  • 채민호

Assignees

  • 현대자동차주식회사
  • 기아 주식회사

Dates

Publication Date
20260507
Application Date
20241029

Claims (7)

  1. An electric rotating machine having a stator and a rotor disposed inside the stator, The above rotor: A plurality of rotor cores rotatably provided around a shaft; A plurality of magnets embedded in the rotor core and having two ends that extend in the axial direction of the rotor core and protrude to the outside of the rotor core; A pair of retainers coupled to the shaft and stacked at both ends of the rotor core, supporting both ends of a magnet protruding outwardly from both ends of the rotor core; and An electric rotating machine comprising a middle plate positioned between the plurality of rotor cores.
  2. In Article 1, An electric rotating machine comprising a middle plate having a core rib formed thereon.
  3. In Article 1, An electric rotating machine in which a plurality of rotor cores located at both ends of the middle plate are configured in a form in which positions corresponding to the core ribs are open.
  4. In Article 1, The above-mentioned retainer is characterized by having a structure in which one side of a plurality of support holes into which the end of a magnet protruding outwardly from the rotor core is inserted is open.
  5. In Paragraph 4, An electric rotating machine characterized by the above-mentioned support hole being formed by axially drilling in the retainer.
  6. In Article 1, An electric rotating machine characterized in that the plurality of rotor cores are laminated with annular strip-shaped steel plates.
  7. In Paragraph 6, The above steel plate is an electric rotating machine composed of silicon.

Description

electric rotating apparatus The present invention relates to an electric rotating machine, and more specifically, to an electric rotating machine having a structure for reducing the thickness of the core rib and increasing torque density. Generally, electric vehicles utilize an electric motor as a driving force, and the electric motor needs to increase torque density to generate the high driving force required as a driving force for the vehicle. In order to increase the torque density of an electric motor, it is necessary to reduce flux leakage, and in order to reduce flux leakage, it is also necessary to reduce the thickness of the ribs of the rotor core. This is because the flux leakage increases as the thickness of the ribs of the rotor core increases. However, since the lip of the rotor core is provided on the outer diameter of the rotor core and serves to support the magnet embedded in the rotor core, if the thickness of the lip is reduced, the supporting force for the magnet decreases, which reduces resistance to the centrifugal force generated during the rotation of the rotor and makes it difficult to stably support the magnet. FIG. 1 schematically illustrates an electric rotating machine according to one embodiment of the present invention. FIG. 2 illustrates a diagram explaining the principle of load (centrifugal force) distribution during rotor rotation of an electric rotating machine according to one embodiment of the present invention. FIG. 3a illustrates the drawing as seen in AA of FIG. 1 according to one embodiment of the present invention. FIG. 3b illustrates the drawing viewed from BB of FIG. 1 according to one embodiment of the present invention. FIG. 4 illustrates the configuration of an electric rotating machine including three rotor cores as another embodiment of the present invention. Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be interpreted as being limited to the embodiments below. These embodiments are provided to more completely explain the present invention to those with average knowledge in the art. Additionally, terms such as "...part," "...unit," and "...module" described in the specification refer to a unit that processes at least one function or operation, and this may be implemented in hardware, software, or a combination of hardware and software. Furthermore, the terms used in the specification are used merely to describe specific embodiments and are not intended to limit the embodiments. Singular expressions include plural expressions unless the context clearly indicates otherwise. Additionally, various embodiments in this specification may be implemented as software (e.g., a program) comprising instructions stored on a machine-readable storage medium (e.g., a computer). The machine may include an electronic device (e.g., a server) according to the disclosed embodiments, which is a device capable of calling instructions stored from the storage medium and operating according to the called instructions. The instructions may include code generated or executed by a compiler or an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, "non-transitory" means only that the storage medium does not contain a signal and is tangible, and does not distinguish whether data is stored semi-permanently or temporarily on the storage medium. Hereinafter, embodiments will be described in detail with reference to the attached drawings. In describing with reference to the attached drawings, identical or corresponding components are given the same reference numerals, and redundant descriptions thereof will be omitted. Figure 1 attached is a schematic diagram illustrating the configuration of an electric rotating machine according to one embodiment of the present invention, and Figure 2 is a diagram explaining the principle of reducing the centrifugal load of the core lip (23) when the rotor (20) of the electric rotating machine according to one embodiment of the present invention rotates. Additionally, FIG. 3a is a partial cross-sectional view of the rotor (20) viewed from the A-A direction of FIG. 1, and FIG. 3b is a partial cross-sectional view of the rotor (20) viewed from the B-B direction of FIG. 1. In addition, FIG. 1 shows only a part of the stator (10) and rotor (20) of an electric rotating machine, and shows the general components of an electric motor, such as the housing in which the stator (10) and rotor (20) are housed, with the parts omitted. As illustrated in FIG. 1, an electric rotating machine according to an embodiment of the present invention comprises a stator (10), a rotor (20) disposed in the inner space of the stator (10), and a shaft (30) provided at the rotational center of the rotor (20). The above stator