CN-117335589-B - Motor rotor core structure

CN117335589BCN 117335589 BCN117335589 BCN 117335589BCN-117335589-B

Abstract

The invention provides a motor rotor core structure, which is mainly technically characterized in that a plurality of through hole-shaped spaces are sequentially arranged on a rotor core of a rotary motor along the circumferential direction of a motor rotary shaft as a circle center, and when the through hole-shaped spaces form barriers to magnetic circuits in a rotor, a plurality of straight rod-shaped connecting elements made of non-magnetic materials are penetrated at the same time, so that the overlapping state of a plurality of silicon steel sheets forming the core is fixed by the connecting elements, the integral rigidity of the core is improved, and the possibility of deformation or breakage of the silicon steel sheets caused by centrifugal force of high-speed rotation is reduced.

Inventors

ZHAN YUCHENG
LIN HUANKAI

Assignees

大银微系统股份有限公司

Dates

Publication Date: 20260508
Application Date: 20220623

Claims (9)

1. A motor rotor core structure, comprising: The iron core is formed by sequentially and coaxially splicing a plurality of annular silicon steel sheets, is provided with an inner diameter ring surface and an outer diameter ring surface, and is formed by sequentially and alternately connecting a plurality of first arcs and a plurality of second arcs with different radians in series; A plurality of magnet slots which are separated from each other, are respectively arranged between the inner diameter ring surface and the outer diameter ring surface of the iron core, and extend axially and penetrate through the iron core in parallel with the curvature center of the inner diameter ring surface of the iron core; A plurality of paired through holes which extend through the iron core in an axial direction parallel to the curvature center of the inner diameter ring surface of the iron core and are separated from two sides of each magnet slot in the radial direction; The magnetic barrier spaces are in a hole shape in pairs, extend along the axial direction parallel to the curvature center of the inner diameter ring surface of the iron core, respectively penetrate through the iron core, respectively enable the magnetic barrier spaces in pairs to be respectively arranged between two sides of each magnet slot and the paired through holes, respectively communicate with the magnet slot through a first side and communicate with the through holes through a second side; A plurality of straight rod-shaped combining elements made of non-magnetic conductive materials are respectively penetrated and fixed in the through holes, and force opposite to each other is applied to the two axial ends of the iron core and acts on the overlapped silicon steel sheets; the hole wall of each through hole is abutted against the peripheral side surface of each combining element penetrating into the hole space; The inner diameter of each first side is larger than that of each second side; The inner diameter of each first side is larger than the inner diameter of the communication area between each first side and each magnet slot, and The inner diameter of the channel connecting the second sides with the through holes is smaller than the inner diameter of the through holes.
2. The motor rotor core structure of claim 1, wherein the through holes satisfy the following formula I, and each of the flux-barrier spaces communicates with each of the through holes adjacent thereto, satisfying the following formula II: formula (I): 1.9%≤α≤10.1%; formula II: gamma is more than or equal to 11.3 percent and less than or equal to 14.3 percent, wherein, D is the aperture of the through holes; ro is the radius of the second arc; f is the straight line distance between the first side and the curvature center of the through hole, and each magnetic barrier space and each through hole are communicated with each other.
3. The motor rotor core structure of claim 1, wherein each of the magnetic barrier spaces is triangular, a first side of the triangle is defined by the first side, a second side of the triangle is defined by an inner side wall, a third side of the triangle is defined by an outer side wall, and positions of the through holes communicating with each of the magnetic barrier spaces are respectively located in the range of each of the third sides.
4. The motor rotor core structure of claim 1, wherein in a radial direction of the core, the magnetic barrier space is adjacent to an inner wall of the inner diameter ring surface of the core and the magnetic barrier space is adjacent to an outer wall of the outer diameter ring surface, and an angle therebetween is between 16 ゚ and 35 ゚.
5. The motor rotor core structure of claim 1, wherein in a radial direction of the core, the magnetic barrier space is adjacent to an inner wall of the inner diameter ring surface of the core, and the adjacent magnet slot is adjacent to an inner slot surface of the inner diameter ring surface, and an inner angle therebetween is between 150 ゚ and 190 ゚.
6. The motor rotor core structure of claim 1, wherein each of the coupling members comprises a straight rod-shaped shaft portion extending through the through holes, and two end portions located outside the two axial ends of the core, and each of the end portions is fixedly connected to a rod end of the shaft portion.
7. The motor rotor core construction as recited in claim 1 wherein the radial cross-section of each of the through holes is of circular planar geometry.
8. The motor rotor core construction as recited in claim 1 wherein the radial cross-section of each of the through holes has an elliptical planar geometry.
9. The motor rotor core construction as recited in claim 1 wherein the radial cross-section of each of the through holes has a polygonal planar geometry.

Description

Motor rotor core structure Technical Field The present invention relates to motor technology, and more particularly, to a motor rotor core structure. Background In order to suppress stress caused by centrifugal force at high speed rotation to a spindle motor rotor, in the patent publication US2014167551A1, by designing the shape of a magnet slot side magnetic barrier hole of the rotor, the maximum stress of the narrowest region between the part and the outer diameter surface of the rotor due to centrifugal force is reduced by using the smooth arc shape of the wall of the magnet barrier Kong Waijing side hole, so that the rotor is prevented from scattering to the stator side even if the rotor is damaged due to stress concentration at high speed rotation. Meanwhile, the' 551A1 proposal explicitly indicates that the through holes penetrating the rotor are not recommended to provide penetration and combination of the through bolts, because the through holes become new stress concentration points, which can reduce the strength of the rotor, and the prior art regarding the spindle motor improves the rigidity by increasing the diameter of the spindle, thereby obtaining a good processing precision, and also causes the thickness of the rotor element surrounding the periphery of the spindle to be relatively reduced in the radial direction, so that the rotor is in a limited radial thickness range, and the purpose of fixing and combining the silicon steel sheets of the iron core by the through bolts is difficult to be additionally provided with the through holes. Disclosure of Invention The main object of the present invention is to provide a motor rotor core structure, which can improve the structural rigidity of the rotor core, and the motor rotor can especially meet the high-speed rotation requirement of a spindle motor. In order to achieve the above object, the present invention provides a rotor core structure of a rotary motor, which is mainly technically characterized in that a plurality of spaced through-hole spaces are sequentially provided on a rotor core of the rotary motor along a circumferential direction with a motor rotation axis as a center of a circle, and when the through-hole spaces form a barrier to a magnetic circuit in the rotor, the through-hole spaces are simultaneously used for penetrating a plurality of straight rod-shaped connecting elements made of non-magnetic conductive materials, so that a plurality of silicon steel sheets constituting the core are fixed by the connecting elements in a mutually overlapped state, thereby improving the rigidity of the whole core and reducing the possibility of deformation or breakage of the silicon steel sheets caused by centrifugal force of high-speed rotation. Further, the plurality of through-hole spaces include a through-hole-shaped magnetic barrier space and a through-hole adjacent to and communicating with the magnetic barrier space, and each through-hole-shaped space is located on both sides of the magnet slot of the rotor core in the circumferential direction, wherein the through-hole-shaped spaces located on both sides of a single magnet slot are mirrored with each other with the diameter of the circumference as a mirror axis and communicate with the magnet slot with the magnetic barrier space. The magnetic barrier space is communicated with the magnet groove adjacently by a first side and communicated with the through hole adjacently by a second side, the inner diameter of the first side of the magnetic barrier space is larger than that of the second side, the magnetic barrier space with equal inner diameter variation is arranged on the radial section of the circumference, and the specific shape of the magnetic barrier space can be a triangular plane geometry. Meanwhile, the inner diameter of the second side of the magnetic barrier space is smaller than the inner diameter of the through hole, so that the bonding element penetrating into the through hole cannot radially shift into the magnetic barrier space through the communication part between the magnetic barrier space and the through hole, and the restraint positioning effect of the bonding element is achieved. And the inner diameter of the communication part between the magnetic barrier space and the magnet slot is smaller than the inner diameter of the first side of the magnetic barrier space and is also smaller than the height of the slot space of the magnet slot in the circumferential radial direction, so that the magnet embedded in the magnet slot is ensured not to be shifted into the magnetic barrier space through the communication part between the magnet slot and the magnetic barrier space, and the effect of restraining and positioning the magnet positioned in the magnet slot is provided. Drawings FIG. 1 is a perspective view of a preferred embodiment of the present invention. Fig. 2 is a cross-sectional view of a preferred embodiment of the present invention taken along line 2-2 in fig.