KR-20260062453-A - Shaft-axis set integrated Magnetic geared permanent magnet synchronous motors

KR20260062453AKR 20260062453 AKR20260062453 AKR 20260062453AKR-20260062453-A

Abstract

The present invention relates to a magnetic geared synchronous motor. A magnetic geared synchronous motor according to one embodiment of the present invention may include a combined shaft in which a wheel shaft, through which wheels are coupled at both ends, and a hollow shaft through which the wheel shaft passes are integrated to serve both the wheel shaft and the hollow shaft; a shaft fixing unit in which a hole is formed to allow the combined shaft to pass through and which is fixed to the combined shaft inserted into the hole; a stator that is cylindrical in shape with a hollow interior and has a stator-side permanent magnet formed on its inner surface, through which the combined shaft passes; an inner rotor formed to be rotatable relative to the combined shaft; and an outer rotor formed to be interposed between the stator and the inner rotor to generate rotational force and thereby transmit rotational force to the combined shaft.

Inventors

박찬배
이형우
이재범
임재현
백종민

Assignees

국립한국교통대학교산학협력단

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (7)

In magnetic geared synchronous motors, A combined shaft in which a wheel axle, to which wheels are coupled at both ends, and a hollow shaft through which the wheel axle passes are integrated, so as to be used for both the wheel axle and the hollow shaft; A shaft fixing unit having a hole formed to allow the aforementioned combined shaft to pass through, and fixed to the combined shaft inserted into the hole; A stator having a hollow interior in a cylindrical shape, with a permanent magnet on the stator side formed on the inner surface, through which the combined shaft passes; An inner rotor rotatably formed with respect to the above-mentioned combined shaft; and A magnetic geared synchronous motor comprising an outer rotor formed to be interposed between the stator and the inner rotor, generating rotational force to transmit rotational force to the combined shaft.
In paragraph 1, The above outer rotor is, A magnetic geared synchronous motor in which the shaft fixing unit is coupled to one end, and the generated rotational force is transmitted to a combined shaft fixed to the shaft fixing unit.
In paragraph 1, A magnetic geared synchronous motor in which the coupling connecting the outer rotor and the hollow shaft can be omitted as the above combined shaft is formed integrally with the above wheel shaft.
In paragraph 1, The above-mentioned dual-purpose shaft is, A magnetic geared synchronous motor comprising a plurality of shaft fixing keys formed in a protruding form on the outer surface and spaced apart from each other along the circumference of the outer surface.
In paragraph 4, A magnetic geared synchronous motor, wherein the hole through which the combined shaft of the shaft fixing unit passes includes a recessed keyhole corresponding to the outer shape of the shaft fixing key so that the shaft fixing key is inserted.
In paragraph 5, As the shaft fixing key is inserted into the keyhole, the shaft fixing unit and the combined shaft are fixed, and A magnetic geared synchronous motor in which the shaft fixing unit coupled to one end of the outer rotor transmits the rotational force generated in the outer rotor to the combined shaft.
In paragraph 6, A magnetic geared synchronous motor having a plurality of shaft fixing keys and spacing distances, taking into account the maximum torque generated in the outer rotor, so that the torque transmitted from the outer rotor is transmitted to the combined shaft through the shaft fixing unit.

Description

Shaft-axis set integrated magnetic geared permanent magnet synchronous motors The present invention relates to a magnetic geared synchronous motor. Generally, railway vehicles utilize an indirect drive traction system and employ reduction gears composed of mechanical gears to transmit electric motor power to the axles. However, reduction gears have the problem of causing power loss and mechanical wear due to friction between the gear teeth during power transmission. Furthermore, since the operation of railway vehicles becomes impossible if gears are damaged, lubrication and periodic maintenance are required to prevent this. Therefore, a direct-drive system, which connects the electric motor directly to the axle, is being researched as a method for next-generation railway vehicle traction systems to prevent power loss and reduce maintenance costs caused by gear wear. Additionally, in the direct drive method described earlier, if a magnetic geared synchronous motor (MG) is used as the power unit instead of a permanent magnet synchronous motor (PMSM), mechanical losses caused by the reduction gear as well as those caused by the motor are minimized, enabling power transmission to the wheels with virtually no loss. Figure 1 is a drawing illustrating an example of a conventional drive system for urban railway vehicles. Figure 2 is a cross-sectional view of a conventional MG-PMSM. Figure 3 is an exploded perspective view of a conventional MG-PMSM. Figure 4 is a drawing illustrating an example of a conventional MG-PMSM assembly. FIG. 5 is a conceptual diagram of a magnetic geared synchronous motor according to one embodiment of the present invention. FIG. 6 is an exploded perspective view of a magnetic geared synchronous motor according to one embodiment of the present invention. FIG. 7 is a drawing illustrating an example of applying a combined shaft of a magnetic geared synchronous motor according to one embodiment of the present invention. FIG. 8 is a diagram illustrating an example comparing a bogie system to which a magnetic geared synchronous motor according to one embodiment of the present invention is applied with a conventional bogie system. FIG. 9 is a drawing illustrating an example of fixing a combined shaft and a shaft fixing unit of a magnetic geared synchronous motor according to one embodiment of the present invention. FIG. 10 is a drawing illustrating an example of a combined shaft and a shaft fixing key of a magnetic geared synchronous motor according to one embodiment of the present invention. The objectives and effects of the present invention, and the technical configurations for achieving them, will become clear by referring to the embodiments described in detail below in conjunction with the accompanying drawings. In describing the present invention, if it is determined that a detailed description of known functions or configurations may unnecessarily obscure the essence of the invention, such detailed description will be omitted. However, this is not intended to limit the invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intentions or practices of the user or operator. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Therefore, such definition should be based on the content throughout this specification. The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application. Here