Improved structure of high frequency rotating mechanism

Abstract

The improved structure of the high-frequency rotating mechanism provided by this invention involves at least five or more permanent magnets disposed in each pole of the motor rotor. One permanent magnet is positioned as the center, with the remaining permanent magnets symmetrically connected in series on both sides of the center. The adjacent ends of the multiple permanent magnets on both sides have the same magnetic pole, thus maintaining a repulsive distance between them due to the repulsive force of like poles, preventing direct contact. This repulsive force maintains the relative position of adjacent permanent magnets, eliminating the need for positioning structures as in conventional technologies. This avoids the centrifugal force acting on the positioning structure during high-speed rotation, reducing the negative impact on the rotor core. Furthermore, the use of numerous dispersed permanent magnets with small volume and mass disperses the centrifugal force, further reducing the possibility of rotor core deformation or damage.

Description

Technical Field

[0001] This invention relates to high-frequency rotary motor technology, and in particular to an improved structure of a high-frequency rotary mechanism. Background Technology

[0002] In U.S. Patent Application No. 17 / 461739, the applicant provided a rotor technology that can reduce stress concentration in non-circular rotors under high-frequency rotation, thereby improving the service life of components. However, due to the magnetic unit set in each pole, there is still a risk that the centrifugal force generated by the large volume of some permanent magnets during high-speed rotation will cause some stress concentration in the rotor core, resulting in potential damage or deformation of the rotor core. Summary of the Invention

[0003] Therefore, the main objective of this invention is to provide an improved structure for a high-frequency rotating mechanism, which can reduce the stress caused by the centrifugal force of the permanent magnet on the iron core when the motor rotor rotates at high frequency, thereby reducing the possibility of deformation or damage to the motor rotor iron core.

[0004] Therefore, to achieve the above objectives, the improved structure of the high-frequency rotating mechanism provided by the present invention has the following main structure: permanent magnets are disposed in each pole of the motor rotor, the number of which is at least five or more odd numbers, with one permanent magnet as the center, and the remaining permanent magnets are symmetrically connected in series on both sides of the center. At the same time, the adjacent ends of the plurality of permanent magnets on both sides are made to have the same magnetic pole, so that the adjacent ends are separated by a repulsion gap under the repulsion of like poles and do not directly touch. The relative position between adjacent permanent magnets is maintained by the above-mentioned repulsion, without the need for positioning by a limiting support structure as in the prior art. This avoids the centrifugal force acting on the limiting support structure during high-speed rotation, reduces the negative impact on the rotor core, and the centrifugal force is dispersed by a large number of dispersed permanent magnets with small volume and mass, further reducing the possibility of rotor core deformation or damage.

[0005] To achieve the aforementioned technical features, the improved structure of the high-frequency rotating mechanism includes a rotating element comprising a rotor portion serving as a main shaft motor, a plurality of receiving slots, a plurality of first positioning protrusions, and a plurality of magnetic assemblies composed of these permanent magnets. The rotating element has a tubular annular body, an inner annular surface that is circular in the radial cross-section of the body is located on the inner circumferential side of the body, and an outer annular surface that is non-circular in the radial cross-section of the body is located on the outer circumferential side of the body. The outer annular surface is formed by a plurality of first arc surfaces and a plurality of second arc surfaces of different curvatures sequentially and alternately connected. The maximum straight-line distance between the center of the inner annular surface and the first arc surface is greater than the maximum straight-line distance between the center of the inner annular surface and the second arc surface.

[0006] These grooves are each in the shape of an arc hole, and are distributed circumferentially on the body, between the first arc surface and the inner ring surface. They extend along the central axis of the inner ring surface to a predetermined depth on the body, and extend in an arc shape along the circumference of the body for a predetermined width.

[0007] The first positioning protrusions are respectively protruding in pairs on one side of the groove wall of each of the cavities, so as to divide the cavities into a first space between the pair of first positioning protrusions and two second spaces located on both sides of the first space.

[0008] The number of these magnetic assemblies is the same as the number of motor poles, and they are respectively embedded in each of the slots, and each has at least five permanent magnets as described above. The first permanent magnet system located at the center is located in the first space, and the two second permanent magnets located on both sides are located in the second spaces and away from the first permanent magnet. The two third permanent magnets are located in the second spaces and are between the second permanent magnets and the first permanent magnet, with one end abutting against the first positioning protrusion, and the other end of the third permanent magnet has the same magnetic pole as one end of the adjacent second permanent magnet, so that they are separated by the repulsion gap, and there is no structure protruding from the slot wall in the repulsion gap.

[0009] Furthermore, to improve the electromagnetic characteristics of the rotor, the improved structure of the high-frequency rotating mechanism can include a plurality of magnetic barrier spaces and a plurality of second positioning protrusions. Each magnetic barrier space is respectively disposed on the body and is connected to the two ends of each accommodating groove in the width direction. Each second positioning protrusion is respectively disposed on the body and is located between the magnetic barrier spaces and the two ends of each accommodating groove, and abuts against the other end of the second permanent magnet to limit the second permanent magnet.

[0010] As a preferred embodiment of the above technical solution, preferably, each of the second permanent magnets and each of the third permanent magnets have substantially the same volume and mass.

[0011] As a preferred embodiment of the above technical solution, preferably, each of the magnetic assemblies is arranged along an imaginary reference arc, and each of the first permanent magnets, the second permanent magnets, and the third permanent magnets are tangent to the reference arc at an angle.

[0012] As a preferred embodiment of the above technical solution, preferably, the reference arc is concentric with the curvature center of the first arc surface, and the radius B of the reference arc and the radius A of the first arc surface satisfy 0.5A≦B≦0.95A.

[0013] As a preferred embodiment of the above technical solution, preferably, the assumed position of the center of the reference arc is located within a translational distance (D) offset radially from the center of curvature of the first arc surface, with the center of curvature of the first arc surface as the central position, and the translational distance is less than the distance (C) between the central position and the center of the inner ring surface, and satisfies D≦0.4C.

[0014] As a preferred embodiment of the above technical solution, preferably, the arcs defined by the lines connecting the centroids of the first permanent magnet, each of the second permanent magnets, and each of the third permanent magnets in each of the magnetic groups have curvature centers that are not concentric with the center of the inner toroidal surface.

[0015] As a preferred embodiment of the above technical solution, the improved structure of the high-frequency rotary mechanism is the rotor element of the main shaft motor.

[0016] As a preferred embodiment of the above technical solution, preferably, each of the magnetic groups corresponds to a single pole of the spindle motor, and the unfolding angle (E) of the first arc surface, the unfolding angle (F) of the single pole, and the number of poles (P) of the spindle motor satisfy the following formula:

[0017] F = 360 / P, α = E / F × 100%, and α is between 50% and 98%.

[0018] As a preferred embodiment of the above technical solution, preferably, the repulsion distance has a fan-shaped shape on the radial cross-section of the body. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a perspective view of a preferred embodiment of the present invention.

[0021] Figure 2 This is an end view of a preferred embodiment of the present invention.

[0022] Figure 3 and Figure 4 As a preferred embodiment of the present invention Figure 2 A magnified view of the K region.

[0023] Among them, (10) improved structure of high frequency rotation mechanism; (20) rotating element; (21) body; (22) inner ring surface; (23) outer ring surface; (231) first arc surface; (232) second arc surface; (24)(24a)(24b) reference arc; (241) origin position; (241a)(241b) boundary position; (30) accommodating groove; (31) first space; (32) second space; (40) magnetic barrier space; (50) first positioning protrusion; (60) second positioning protrusion; (70) magnetic group; (71) first permanent magnet; (72) second permanent magnet; (73) third permanent magnet; (74) repulsion distance. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please refer to the following first. Figure 1 As shown, the improved structure (10) of the high-frequency rotating mechanism provided in a preferred embodiment of the present invention is based on some components of a conventional spindle motor rotor. In terms of structure, it mainly includes a rotor element (20), a plurality of slots (30), a plurality of magnetic barrier spaces (40), a plurality of first positioning protrusions (50), a plurality of second positioning protrusions (60), and a plurality of magnetic groups (70).

[0026] Please refer to Figure 2 As shown, the rotating element (20) is formed by coaxially stacking a plurality of annular silicon steel sheets, and has an annular body (21) that is generally tubular. An inner annular surface (22) is located on the inner circumference of the body (21), and its ring is circular on the radial cross-section of the body (21). An outer annular surface (23) is located on the outer circumference of the body (21), and its ring is different from the circular inner annular surface. Instead, it is formed by a plurality of first arc surfaces (231) and a plurality of second arc surfaces (232) with different curvatures, which are interlaced and connected in sequence, so that the shape presented on the radial cross-section of the body is a non-circular shape like a plum blossom. The maximum straight distance between the center of the inner annular surface (22) and the first arc surface (231) is greater than the maximum straight distance between the center of the inner annular surface (22) and the second arc surface (232).

[0027] Each of the grooves (30) is in the shape of a hole, and the number of them is equal to the number of poles of the main shaft motor. In this embodiment, the number of them is set to four, and they are evenly distributed on the body (21) in a ring shape along the circumference of the body (21), and are located between the first arc surface (231) and the inner ring surface (22). They are respectively extended along the tube axis direction of the body (21) and penetrated at both ends of the axial direction of the body (21), and extend in an arc shape along the circumference of the body (21) for a predetermined width of arc length.

[0028] Each of the magnetic barrier spaces (40) is perforated in the body (21) and is adjacent to and connected to the two ends of each of the accommodating grooves (30) in the width direction.

[0029] Please see again Figure 3 As shown, each of the first positioning protrusions (50) is provided in pairs on one side of the groove wall at the middle position of each accommodating groove (30), and the pairs of first positioning protrusions (50) are separated from each other, thereby dividing the hole space of each accommodating groove (30) into a first space (31) between each of the first positioning protrusions (50) and two second spaces (32) on both sides of the first space (31).

[0030] Each of the second positioning protrusions (60) is respectively provided on the body (21) and is located between the two ends of the magnetic barrier space (40) and the accommodating groove (30) in width.

[0031] Each of the magnetic assemblies (70) is respectively housed in each of the receiving slots (30), and each includes a first permanent magnet (71) located in the first space (31), and two second permanent magnets (72) and two third permanent magnets (73) located in the second space (32). From the radial cross-section of the body (21), the first permanent magnet (71) is generally rectangular in shape, with its long axis abutting against each of the first positioning protrusions (50) at both ends, thus providing limiting support. Each of the second permanent magnets (72) is also generally rectangular, and its long axis abuts against each of the first positioning protrusions (50). One end of the long axis of the rectangle abuts against each of the second positioning protrusions (60). Each of the third permanent magnets (73) is rectangular and located between the first permanent magnet (71) and each of the second permanent magnets (72), so that one end of the long axis of the rectangle abuts against each of the first positioning protrusions (50), and the other end of the long axis of the rectangle has the same magnetic pole as the other end of the long axis of the rectangle of the adjacent second permanent magnet (72), so that they do not directly contact each other under the repulsive action of the same magnetic pole, and form a repulsion gap (74) that is close to a fan-shaped or wedge-shaped pushing shape.

[0032] By increasing the number of permanent magnets in each of the aforementioned magnetic groups (70), the mass of a single permanent magnet can be reduced, thereby reducing the centrifugal force generated by a single permanent magnet under high-frequency rotation, achieving the effect of dispersing the stress acting on the rotating element (20), and making each of the second permanent magnets (72) and each of the third permanent magnets (73) have substantially the same volume and mass, so as to achieve the best dispersion effect.

[0033] Furthermore, due to the existence of the repulsion spacing (74), there is no need for any tangible components protruding from the groove wall, such as the first positioning protrusion, between the adjacent ends of the second permanent magnet (72) and the third permanent magnet (73). They can maintain their relative positions with each other under the repulsive action of the same magnetic pole, thereby achieving the effect of limiting. Moreover, under high-frequency rotation, the repulsive action of the magnetic pole can avoid the stress caused by centrifugal force, thereby further reducing the stress caused by centrifugal force on the rotating element (20).

[0034] To achieve optimal structural rigidity and electromagnetic properties, the above embodiments can be further optimized. Please refer to [link / reference needed]. Figure 4 :

[0035] Regarding the relationship between the motor poles and the first arc surface (231), the following equation must be satisfied between them:

[0036] F = 360 / P, α = E / F × 100%, and α is between 50% and 98%;

[0037] In the formula, P is the number of poles of the motor, F is the development angle of a single pole of the motor, and E is the development angle of the first arc surface (231).

[0038] For each of the magnetic groups (70), the arc defined by the line connecting the centroids of their respective permanent magnets has a curvature center that is not concentric with the center of the inner toroidal surface (22). Each permanent magnet is tangent to an imaginary reference arc (24) at an angle. The reference arc (24) is an imaginary circle assumed to be centered on the curvature center of the first arc surface (231). The imaginary radius (B) of the reference arc and the radius (A) of the first arc surface (231) satisfy 0.5A≦B≦0.95A.

[0039] Furthermore, the assumed position of the center of the reference arc (24) can be selected using the formula D≦0.4C, where C is the radial distance between the center of curvature of the first arc surface (231) and the center of the inner ring surface (22), and D is the radial translation distance of the center of the reference arc (24). In detail, the range of D is the radial displacement relative to the center of the inner ring surface (22) with the center of curvature of the first arc surface (231) as the center position, either outward or inward. Figure 4As shown, the imaginary radius is a constant value. When the selected D = 0, the center of the circle is the origin (241) with the curvature center of the first arc surface (231) as the origin, and the reference arc (24) is imagined. When the selected D = 0.4, the two boundary positions (241a) and (241b) of the assumed range of the center are located on both sides of the origin (241), and the reference arcs (24a) and (24b) are imagined.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An improved structure of a high frequency rotary mechanism, characterized by comprising: Includes: A rotating element has a tubular annular body, an inner annular surface that is circular in the radial cross-section of the body located on the inner circumferential side of the body, and an outer annular surface that is non-circular in the radial cross-section of the body located on the outer circumferential side of the body. The outer annular surface is formed by a plurality of first arc surfaces and a plurality of second arc surfaces of different curvatures sequentially and alternately connected to each other. The maximum straight-line distance between the center of the inner annular surface and the first arc surface is greater than the maximum straight-line distance between the center of the inner annular surface and the second arc surface. Most of the arc-shaped cavities in the form of holes are distributed in a ring around the circumference of the body, between the first arc surface and the inner ring surface, and extend along the central axis of the inner ring surface to a predetermined depth on the body, and extend in an arc shape around the circumference of the body for a predetermined width. A plurality of pairs of first positioning protrusions, each of which is spaced apart from each other, protrudes from one side of the groove wall of each of the accommodating grooves, thereby dividing the accommodating grooves into a first space between the pairs of first positioning protrusions and two second spaces located on both sides of the first space. Each of the magnetic assemblies contained in each of the troughs has a first permanent magnet located in the first space, with its sides abutting against the first positioning protrusions. Two second permanent magnets are located in each of the second spaces and are away from the first permanent magnets. Two third permanent magnets are located in each of the second spaces and are between the second permanent magnets and the first permanent magnets. One end of the third permanent magnet abuts against the first positioning protrusion, and the other end of the third permanent magnet and one end of the adjacent second permanent magnet have the same magnetic poles, and are separated from each other by a repulsion gap. There is no structure protruding from the trough wall in the repulsion gap. Most of the perforated magnetic barrier spaces are respectively provided on the body and are respectively connected to the two ends of each of the accommodating grooves in the width direction; Most of the second positioning protrusions are respectively located on the body and between the two ends of each magnetic barrier space and each of the receiving grooves, and abut against the other end of the second permanent magnet to limit each of the second permanent magnets.

2. The improved high frequency rotary mechanism according to claim 1, wherein Each of the second permanent magnets and each of the third permanent magnets has substantially the same volume and mass.

3. The improved high frequency rotary mechanism according to claim 1, wherein Each of the magnetic systems is arranged along an imaginary reference arc, and each of the first permanent magnets, the second permanent magnets, and the third permanent magnets is tangent to the reference arc at an angle.

4. The improved high frequency rotary mechanism according to claim 3, wherein The reference arc is concentric with the curvature center of the first arc surface, and the radius B of the reference arc and the radius A of the first arc surface satisfy 0.5A≦B≦0.95A.

5. The improved structure of the high-frequency rotating mechanism according to claim 3, characterized in that, The assumed position of the center of the reference arc is located within a translation distance D offset radially from the center of curvature of the first arc surface, such that the translation distance is less than the distance C between the center position and the center of the inner ring surface, and satisfies D≦0.4C.

6. The improved structure of the high-frequency rotating mechanism according to claim 1, characterized in that, The arcs defined by the lines connecting the centroids of the first permanent magnet, each of the second permanent magnets, and each of the third permanent magnets in each of the magnetic groups have curvature centers that are not concentric with the center of the inner toroidal surface.

7. The improved structure of the high-frequency rotating mechanism according to claim 1, characterized in that, The improved structure of the high-frequency rotating mechanism results in a rotor element of the main shaft motor.

8. The improved structure of the high-frequency rotating mechanism according to claim 7, characterized in that, Each magnetic assembly corresponds to a single pole of the spindle motor, and the unfolding angle E of the first arc surface, the unfolding angle F of the single pole, and the number of poles P of the spindle motor satisfy the following equation: F = 360 / P, α = E / F × 100%, and α is between 50% and 98%.

9. The improved structure of the high-frequency rotating mechanism according to claim 1, characterized in that, The repulsion distance has a fan-shaped shape on the radial cross-section of the body.

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