KR-102962403-B1 - Rotor for Spoke Permanent Magnet Synchronous Motor with Axial Magnets and Spoke Permanent Magnet Synchronous Motor having the Same

KR102962403B1KR 102962403 B1KR102962403 B1KR 102962403B1KR-102962403-B1

Abstract

The present invention relates to a permanent magnet synchronous motor having a spoke-type rotor, and more specifically, to a motor in which a permanent magnet magnetized along the axial direction is added to the side of the pole piece of the spoke-type synchronous motor to increase the air gap magnetic flux density.

Inventors

남상욱
남광희
동진수

Assignees

주식회사 이피티

Dates

Publication Date: 20260511
Application Date: 20240709

Claims (17)

A body comprising a disc shape having a constant thickness in the axial direction, a body hole formed in the center through which a shaft passes, and a plurality of pole pieces formed along the radial direction and arranged radially so as to form a plurality of permanent magnet insertion spaces along the circumferential direction; A permanent magnet provided in the above permanent magnet insertion space and magnetized in the circumferential direction, arranged such that the polarities of the permanent magnets in contact with both sides of the circumferential direction of the pole piece are identical to each other; A plurality of axial magnets provided to be in contact at a position corresponding to the axial outer surface of each of the above-mentioned pole pieces, magnetized along the axial direction, and arranged such that the polarity of the surface in contact with the pole piece is the same as the polarity of the permanent magnets located on both sides in the circumferential direction of the pole piece; and An end plate that magnetically connects a plurality of shaft magnets arranged along the circumferential direction and in contact with the axial outer surface of the plurality of shaft magnets; A rotor for a permanent magnet synchronous motor comprising
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In Article 1, The above rotor is, A rotor for a permanent magnet synchronous motor that forms a closed-loop magnetic circuit by transmitting magnetic flux from the N pole on the axially outer side of the shaft magnet through the end plate to the S pole on the axially outer side of an adjacent shaft magnet.
In Paragraph 3, The above end plate is, A rotor for a permanent magnet synchronous motor, formed in a disc shape corresponding to the body to connect multiple shaft magnets.
In Paragraph 4, The above rotor is, It further includes a shaft magnet fixing frame that accommodates the shaft magnet to prevent the shaft magnet from deviating radially outward when the rotor rotates, and The above end plate is a rotor for a permanent magnet synchronous motor that is coupled to the axial outer side of the above shaft magnet fixing frame.
In Paragraph 5, The above shaft magnet fixing frame is, A rotor for a permanent magnet synchronous motor, further comprising a partition formed along the radial direction and formed at portions corresponding to both sides in the circumferential direction of the shaft magnet to prevent the shaft magnet from moving in the circumferential direction when the rotor rotates.
In Paragraph 6, A rotor for a permanent magnet synchronous motor, wherein a filling foam is provided between the shaft magnet and an adjacent shaft magnet on the shaft magnet fixing frame.
In Paragraph 5, The above shaft magnet fixing frame is, It is coupled to the shaft through a shaft through hole formed in the center, A rotor for a permanent magnet synchronous motor, wherein a first keyway is formed in the shaft through-hole and a second keyway is formed in the shaft, and the rotational force of a shaft magnet fixing frame is transmitted to the shaft through a key fitted into the first and second keyways.
In Paragraph 8, The above end plate and shaft magnet are, A rotor for a permanent magnet synchronous motor, positioned on both axial sides relative to the above body.
In Article 9, The above shaft magnet is, A rotor for a permanent magnet synchronous motor, wherein the polarity of a first axis magnet disposed on one axial surface of the body and a second axis magnet disposed on the other surface is symmetrical to each other.
In Article 9, A pair of the above end plates, A rotor for a permanent magnet synchronous motor, wherein the plurality of shaft magnets are pressed inwardly in the axial direction through a fastening means so as to be in close contact with and fixed to the pole piece.
In Paragraph 11, The above fastening means is, A rotor for a permanent magnet synchronous motor, comprising a bolt and a nut, wherein the bolt penetrates an axial end plate, a permanent magnet, and an axial end plate and is coupled to the nut.
In Article 1, The above rotor is, A rotor for a permanent magnet synchronous motor, wherein the radially inner ends of the pole pieces arranged in a plurality of radially are each joined, and further comprising a fixing bracket through which a shaft passes in the center, wherein the fixing bracket is made of a non-magnetic material.
In Article 1, A rotor for a permanent magnet synchronous motor, characterized in that the diameter of the end plate is within the diameter of the body.
In Article 1, A rotor for a permanent magnet synchronous motor, characterized in that the shaft magnet is arranged to overlap the pole piece along the axial direction, and the cross-sectional area of the shaft magnet is within the cross-sectional area of the pole piece.
In Paragraph 5, The above shaft magnet fixing frame is, A rotor for a permanent magnet synchronous motor made of a non-magnetic material.
A rotor for a permanent magnet synchronous motor according to claim 1; and A stator having a rotor coupling hole formed therein into which the rotor is inserted so as to be rotatable in the axial direction; A spoke-type permanent magnet synchronous motor including

Description

Rotor for Spoke Permanent Magnet Synchronous Motor with Axial Magnets and Spoke Permanent Magnet Synchronous Motor having the Same The present invention relates to a permanent magnet synchronous motor having a spoke-type rotor, and more specifically, to a motor in which a permanent magnet magnetized along the axial direction is added to the side of the pole piece of the spoke-type synchronous motor to increase the air gap magnetic flux density. Spoke-type motors are constructed such that the pole pieces of the rotor have a triangular structure, with permanent magnets of the same polarity in contact with both sides. When the N poles of permanent magnets are in contact with both sides of the triangular rotor pole pieces, the magnetic flux within the pole piece located between the N poles is squeezed and pushed toward the air gap. By similar logic, when the S poles of permanent magnets are in contact with both sides of the pole pieces, the magnetic field lines from the air gap are applied to and attracted into the pole piece located between the S poles. These spoke-type motors utilize ferrite magnets with low residual magnetic flux density to amplify the magnetic flux density of the air gap to the level of a neodymium magnet. FIG. 1 shows a partial enlarged perspective view of a general permanent magnet type synchronous motor (10). As illustrated, the motor (10) is composed of a ring-shaped stator (1) formed along the outer circumference and a rotor (2) provided inside the stator. The rotor (2) includes a spoke-type body (4) having a pole piece (3) formed thereon and a permanent magnet (5) positioned between the body (4). The permanent magnet (5) is magnetized along the circumferential direction, and the permanent magnets (5) facing each other with the pole piece (3) in between are arranged to have the same magnetic pole on the contact surface. Meanwhile, to fix the pole piece (3) to the shaft, a cylindrical fixing bracket (6) is provided on the radially inner side of the pole piece (3). The cylindrical fixing bracket (6) is made of a non-ferromagnetic metal through which magnetic flux cannot pass, so that the magnetic flux is configured not to bypass the shaft located on the radially inner side. In a motor (10) having the above configuration, magnetic flux can be squeezed and pushed out toward the air gap on a pole piece (3) with N poles located on both sides, but since the magnetic flux cannot escape because a cylinder-shaped fixing bracket (6) made of non-ferrous metal is provided on the radially inner side, all of the squeezed magnetic flux is pushed out toward the air gap. In addition, if the side length of the magnetic contact surface is increased, the magnetic flux density of the air gap becomes higher than the residual magnetic flux density of the permanent magnet (5), so it is possible to implement a motor with improved output density. FIG. 1 is a partially enlarged front view showing the rotor and stator of a typical spoke-type permanent magnet synchronous motor. FIG. 2 is an overall perspective view of a rotor of a motor according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of a rotor of a motor according to an embodiment of the present invention. FIG. 4 is a combined perspective view of the rotor body, permanent magnet, fixing bracket, and shaft of the present invention. FIG. 5 is an exploded perspective view of FIG. 4 FIG. 6 is a partially enlarged perspective view illustrating a rotor according to an embodiment of the present invention coupled with a stator. FIG. 7 is a partially enlarged perspective view illustrating the combined structure of a rotor combined with a stator, a pole piece, an axial magnet, and an end plate. FIG. 8 is a plan view illustrating the combined structure of a rotor combined with a stator, a body, an axial magnet, and an end plate. FIG. 9 is a combined perspective view of the axial permanent magnet, the axial magnet fixing frame, and the filling foam of the present invention. FIG. 10 is an exploded perspective view of FIG. 9 FIG. 11 is a combined view of the end plate, shaft magnet fixing frame, and shaft of the present invention. FIG. 12 is a combined view of the rotor and stator of a motor according to one embodiment of the present invention. FIG. 13 shows a graph (a) representing the air gap magnetic flux density of the spoke motor of the present invention and a graph (b) representing the air gap magnetic flux density of a conventional spoke motor. Hereinafter, an embodiment of the present invention as described above will be explained in detail with reference to the drawings. FIG. 2 shows an overall perspective view of a rotor of a motor according to one embodiment of the present invention, and FIG. 3 shows an exploded perspective view of a rotor of a motor according to one embodiment of the present invention. As described above, the rotor (100) is composed of a body (110) including a plurality of pole pieces (112), a permanent ma