KR-102962564-B1 - Slim Motor of Axial Gap Type and Swivel Actuator Using the Same

KR102962564B1KR 102962564 B1KR102962564 B1KR 102962564B1KR-102962564-B1

Abstract

The present invention relates to an axial gap type slim drive motor that can obtain high torque output by increasing the area facing the stator while using a non-rare earth magnet and having a split stator core made of soft magnetic powder (SMC), and a swivel actuator using the same. The driving motor of the present invention comprises: a housing having a hollow cylindrical portion protruding from the bottom in the center; an annular rotor having a back yoke and a magnet coupled to the outer circumference of the rotor support, wherein the rotor support has a lower portion formed in a cup shape and is rotatably coupled to the outer circumference of the hollow cylindrical portion; and an annular stator disposed on the bottom of the housing opposite to the annular rotor and generating a rotating magnetic field to drive the rotation of the rotor; wherein the stator core of the stator comprises a plurality of segmented cores and an annular back yoke having a plurality of through holes formed radially on the same circumference to which the teeth of each of the plurality of segmented cores are coupled, and the annular rotor and the annular stator form an axial gap type motor.

Inventors

김병수
신종화

Assignees

주식회사 아모텍

Dates

Publication Date: 20260511
Application Date: 20230814

Claims (14)

Housing with a hollow cylindrical section protruding from the bottom in the center; An annular rotor having a lower end shaped like a cup and rotatably coupled to the outer circumference of the hollow cylindrical part, and a back yoke and a magnet coupled to the outer circumference of the rotor support; and It includes an annular stator disposed at the bottom of the housing opposite the annular rotor and generating a rotating magnetic field to drive the rotation of the rotor; The stator core of the above stator includes a plurality of segmented cores and an annular back yoke having a plurality of through holes formed radially on the same circumference to which the teeth of each of the plurality of segmented cores are coupled. The rotor support further includes a plurality of protrusions spaced apart and protruding from the upper outer periphery, wherein the inner diameter of the magnet is set larger than the inner diameter of the back yoke, and the inner diameter of the back yoke is set smaller than the imaginary outer diameter formed by the plurality of protrusions of the rotor support. The above-mentioned annular rotor and annular stator form an axial gap type motor, and the drive motor for an axial gap type swivel actuator.
In paragraph 1, The above stator An annular back yoke that functions as a magnetic circuit, having multiple through holes formed radially on the same circumference to which each tooth is coupled; A bobbin assembled on the upper part of the above-mentioned back yoke and having an annular body and a plurality of tooth-jointing parts, each protruding from the annular body and having a through hole formed therein that penetrates the interior thereof; An auxiliary printed circuit board (PCB) assembled on the upper part of the above bobbin, having a plurality of through holes into which the plurality of tooth coupling parts are inserted and protrude, and having a plurality of conductive patterns formed therein to implement a Y-connection of U, V, and W three-phase coils; A plurality of coils, each wound in a bobbinless manner and assembled on the outer surface of the plurality of tooth coupling parts; and A driving motor for an axial gap type swivel actuator comprising: a plurality of split cores, the lower ends of which are inserted into the through holes of the plurality of coils, which penetrate the tooth joint of the bobbin, and which are inserted into the through holes of the back yoke.
In paragraph 2, The above plurality of divided cores each A shoe formed in a fan shape; and It includes a tooth that protrudes from the shoe and has its lower end press-fitted into the through hole of the back yoke; A drive motor for an axial gap type swivel actuator, wherein the above-mentioned split cores each have a shoe protruding radially on the same circumference in a direction perpendicular from the back yoke, and are arranged on an annular back yoke parallel to the axial direction on the same circumference so as to be positioned opposite to the magnet of the rotor.
In paragraph 1, A drive motor for an axial gap type swivel actuator, wherein the plurality of segmented cores are each made of soft magnetic composites (SMC), and the back yoke is a stacked core formed by stacking thin film cores to function as a magnetic path.
In paragraph 1, A drive motor for an axial gap type swivel actuator, wherein the plurality of split cores and back yoke are each made of soft magnetic composites (SMC).
In paragraph 3, The above plurality of coils are assembled on the bobbin of the stator in a U, V, W three-phase driving manner, and A drive motor for an axial gap type swivel actuator, wherein the start lines of each U, V, and W phase coil of the plurality of coils are connected to the U, V, and W output terminals of the inverter circuit through a conductive pattern formed on the auxiliary printed circuit board (PCB), and the end lines of each U, V, and W phase coil are connected to a circular conductive pattern for forming a common electrode printed on the auxiliary printed circuit board (PCB) to form a neutral point of the Y-connection.
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In paragraph 1, A drive motor for an axial gap type swivel actuator, further comprising a rotor worm gear that is integrally extended to the upper end of the rotor support or has its lower end assembled and extends to the upper end of the housing, and generates rotational output of the rotor.
In paragraph 8, First and second bearings stacked in series, disposed between the cup-shaped lower portion and the lower portion of the hollow cylindrical portion of the rotor support to rotatably support the rotor; and A drive motor for an axial gap type swivel actuator, further comprising: a bearing support disposed between the rotor worm gear and the hollow cylindrical part, which is press-coupled to the outer circumference of the hollow cylindrical part to press the second bearing.
In paragraph 1, The magnet of the above rotor is a ferrite magnet, and the drive motor for an axial gap type swivel actuator.
A lower housing with a hollow cylindrical section protruding upward in the center to serve as a supporting axis; An upper housing that is stacked and assembled on the upper part of the lower housing and has a through hole formed in the central part through which the hollow cylindrical part protrudes upward; A drive motor installed inside the lower housing, having a rotor worm gear formed on the outer circumference extending from the rotor support above the through hole to generate rotational output; A reduction gear unit installed inside the upper housing and outputting the rotational force of the drive motor by reducing it; and A rotary table that is rotatably supported on the upper part of the upper housing and capable of high-torque rotation by the reduced rotational force of the reduction gear unit; The above drive motor An annular rotor having a lower end shaped like a cup and rotatably coupled to the outer circumference of the hollow cylindrical part, and a back yoke and a magnet coupled to the outer circumference of the rotor support; and It includes an annular stator disposed on the bottom of the lower housing opposite the annular rotor and generating a rotating magnetic field to drive the rotation of the rotor; The stator core of the above stator includes a plurality of segmented cores and an annular back yoke having a plurality of through holes formed radially on the same circumference to which the teeth of each of the plurality of segmented cores are coupled. The above reduction gear section First and second gear trains, each arranged and coupled at 180-degree intervals on the outer circumference of the rotor worm gear, wherein first and second worm wheels formed in the middle of the first and second power transmission shafts to be gear-coupled with the rotor worm gear, and first to fourth worm gears formed on both sides of the first and second power transmission shafts; First to fourth pinion gear units, each having a third to sixth worm wheel formed at the lower end of the first to fourth support shafts, gear-coupled with the first to fourth worm gears, and first to fourth pinion gears formed at the upper end of the first to fourth support shafts; and A ring gear integrally formed on the inner side of the side portion of the rotary table and gear-coupled with the first to fourth pinion gears; is included. The above-mentioned annular rotor and annular stator form a swivel actuator that forms an axial gap type motor.
In Paragraph 11, First and second bearings stacked in series, disposed between the cup-shaped lower portion and the lower portion of the hollow cylindrical portion of the rotor support to rotatably support the rotor; A bearing support that is press-coupled to the outer circumference of the hollow cylindrical portion and presses the second bearing; and A swivel actuator further comprising a third bearing for rotatably supporting the above-mentioned rotary table on the outer circumference of the upper portion of the above-mentioned hollow cylindrical part.
In Paragraph 11, The above stator An annular back yoke that functions as a magnetic circuit, having multiple through holes formed radially on the same circumference to which each tooth is coupled; A bobbin assembled on the upper part of the above-mentioned back yoke and having an annular body and a plurality of tooth-jointing parts, each protruding from the annular body and having a through hole formed therein that penetrates the interior thereof; An auxiliary printed circuit board (PCB) assembled on the upper part of the above bobbin, having a plurality of through holes into which the plurality of tooth coupling parts are inserted and protrude, and having a plurality of conductive patterns formed therein to implement a Y-connection of U, V, and W three-phase coils; A plurality of coils, each wound in a bobbinless manner and assembled on the outer surface of the plurality of tooth coupling parts; and A swivel actuator comprising: a plurality of segmented cores, the lower ends of which are inserted into the through holes of the plurality of coils, which penetrate the tooth joint of the bobbin, and which are inserted into the through holes of the back yoke.
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Description

Slim Motor of Axial Gap Type and Swivel Actuator Using the Same The present invention relates to a slim drive motor of the axial gap type, and more specifically, to a slim drive motor of the axial gap type equipped with a split stator core made of soft magnetic powder (SMC) and a swivel actuator using the same. An electric actuator plays the role of rotating or moving a driven body in a straight line using high-torque rotational force obtained by converting rotational force generated from a rotational power source into torque. Generally, due to the usage characteristics of actuators, the housing is designed to be low overall and either the width or the length is longer, making it difficult to adopt a structure that mounts a DC motor with an external casing vertically on the inner bottom of the housing. When using a DC motor, since the output shaft must maintain a stopped position when external pressure is applied to the forward and reverse rotational motion, a worm gear must be used to increase the brake torque. To transmit power from a DC motor using a worm gear and worm wheel to the position of the output shaft, spur gears are generally used for connection. In this case, when using multiple spur gears to transmit the rotational power of the drive motor to obtain a large reduction ratio, the tolerance increases, resulting in increased backlash and making precise position control difficult. In addition, if the height of the actuator housing is low, there is a problem that the DC motor must be used horizontally, which causes difficulties in the assembly structure and increases the unit cost. In other words, since the DC motor requires a casing, there is a problem in securing assembly space due to the bearing that holds the casing and the worm shaft. Recently, swivel actuators are being used in conjunction with a rotating table to rotate the body of the vehicle (i.e., the car seat) left and right, serving as actuators for rotating vehicle car seats. Considering that conventional actuators use a DC motor with a casing inside a low-height housing in a horizontal position, a swivel actuator having a compact and slim structure is proposed in Korean Published Patent Application No. 10-2022-0056821 (Patent Document 1) by installing an R-motor type BLDC motor vertically on the bottom of the housing and installing a reduction gear train on the top. However, the drive motor employed in the swivel actuator of Patent Document 1 is a radial gap type inner rotor motor designed to achieve an overall slim structure, so the cross-sectional area (i.e., effective area) of the magnet facing the stator is small. Accordingly, in order to implement a high-torque drive motor, it is required to use expensive rare-earth magnets in the rotor. FIGS. 1 to 2b are a perspective view, a plan view, and a rear view, respectively, of an internal hollow swivel actuator according to a preferred embodiment of the present invention. Figures 3 and 4 are cross-sectional views of the AA line and BB line of Figure 2a, respectively. FIG. 5 is an exploded perspective view of an internal hollow swivel actuator according to a preferred embodiment of the present invention. FIGS. 6 and FIGS. 7 are, respectively, a plan view of FIG. 2a with the rotary table removed and a perspective view with the top of the rotary table removed in an internal hollow swivel actuator according to a preferred embodiment of the present invention. FIGS. 8a to 8c are, respectively, a perspective view showing a bearing housing of a drive motor according to the present invention, a perspective view showing a worm gear coupled to the bearing housing, and a perspective view showing a worm gear and a rotor coupled to the bearing housing. FIG. 9 is an exploded perspective view of the stator of a drive motor according to the present invention. FIGS. 10a and FIGS. 10b are top and bottom perspective views, respectively, of a stator according to the present invention. FIG. 11 is a perspective view showing the combined structure of a stator and a cable according to the present invention. Hereinafter, a preferred embodiment according to the present invention will be described with reference to the attached drawings. In this process, the size or shape of components depicted in the drawings may be exaggerated for clarity and convenience of explanation. Additionally, terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intent or convention of the user or operator. Definitions of such terms should be based on the content throughout this specification. The swivel actuator according to the present invention is used to rotate a driven body, namely a car seat, left and right together with a rotating table. By installing a swivel actuator on a lower plate fixed to the floor surface of a vehicle and fixing a connecting frame installed on the rotating table to an upper plate on which the car seat is installed, the car seat can