Structure of high-frequency rotary mechanism

Patent metadata

Field	Value
Publication number	US-12051942-B2
Application number	US-202217880466-A
Country	US
Kind code	B2
Filing date	Aug 3, 2022
Priority date	Aug 3, 2022
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

Abstract

In an improved structure of high-frequency rotary mechanism, permanent magnets with an odd number of at least five are disposed in each pole of a motor rotor, one of the permanent magnets serves as a center, the other permanent magnets are symmetrically connected in series on two sides of the center, and adjacent ends of the permanent magnets located on two sides are made as a same magnetic pole, so that the adjacent ends are separated without directly abutting against each other by a repulsion distance under a repulsive effect of the same pole, relative positions between the adjacent permanent magnets are maintained by the repulsive effect, and structures of position limiting and support in the prior art for positioning are not required, thereby avoiding centrifugal force of high-speed rotation to act on the structures of position limiting and support, and reducing negative impact on a rotor iron core.

First claim

What is claimed is:

1. An improved structure of high-frequency rotary mechanism comprising:
a rotating element having a tubular annular body, an inner annular surface formed circularly in a radial section of the body being located on an inner peripheral annular side of the body, an outer annular surface formed non-circularly in a radial section of the body being located on an outer peripheral annular side of the body, the outer annular surface being formed by a plurality of first arcuate surfaces and a plurality of second arcuate surfaces with two different radians sequentially alternatively connected in series, wherein a maximum straight distance between a center of circle of the inner annular surface and the first arcuate surface is greater than a maximum straight distance between the center of circle of the inner annular surface and the second arcuate surface;
a plurality of arcuately hole-shaped accommodating grooves distributed annularly along a circumference of the body, disposed between the first arcuate surface and the inner annular surface, extending along the center of circle of the inner annular surface with a predetermined depth on the body axially, and extending arcuately along the circumference of the body with an arc length of a predetermined width;
a plurality of paired first positioning protrusions, each pair of the first positioning protrusions being spaced apart from each other and respectively protruded on one side groove wall of each of the accommodating grooves to separate each of the accommodating grooves into a first space between the paired first positioning protrusions, and two second spaces located on two sides of the first space;
a plurality of magnetic sets accommodated in each of the accommodating grooves and respectively comprising a first permanent magnet located in the first space, two ends of the first permanent magnet respectively abutting against the paired first positioning protrusions, two second permanent magnets respectively located in each of the second spaces and away from the first permanent magnet, and two third permanent magnets respectively located in each of the second spaces and between each of the second permanent magnets and the first permanent magnet, one end of the third permanent magnet abutting against the first positioning protrusion, and another end of the third permanent magnet having a magnetic pole the same as that of one end of the adjacent second permanent magnet, so that the third permanent magnet and the adjacent second permanent magnet being separated by a repulsion distance, and without structure protruding from the groove wall of the accommodating groove in the repulsion distance;
a plurality of hole-shaped magnetic barrier spaces respectively disposed on the body, and respectively connected and communicated with two ends of each of the accommodating grooves in a width direction; and
a plurality of second positioning protrusions respectively disposed on the body and between each of the magnetic barrier spaces and one end of each of the accommodating grooves, and abutting against another end of the second permanent magnet to limit a position of each of the second permanent magnets.

2. The improved structure of high-frequency rotary mechanism as claimed in claim 1 , wherein each of the second permanent magnets and each of the third permanent magnets respectively have same volume and mass substantially.

3. The improved structure of high-frequency rotary mechanism as claimed in claim 1 , wherein each of the magnetic sets is arranged along an imaginary reference arc, and a corner of each of the first permanent magnets, each of the second permanent magnets, and each of the third permanent magnets are respectively tangent to the reference arc.

4. The improved structure of high-frequency rotary mechanism as claimed in claim 3 , wherein the reference arc is concentric with a center of curvature of the first arcuate surface, and a radius B of the reference arc and a radius A of the first arcuate surface satisfy 0.5A≤B≤0.95A.

5. The improved structure of high-frequency rotary mechanism as claimed in claim 3 , wherein an assumed position of a center of circle of the reference arc is located at a central position of the center of curvature of the first arcuate surface, and offset within a range of a translation distance D along a radial direction of the first arcuate surface, and the translation distance D is smaller than a distance C between the center position and the center of circle of the inner annular surface, and satisfies D≤0.4C.

6. The improved structure of high-frequency rotary mechanism as claimed in claim 1 , wherein a center of curvature of an arc defined by connecting centers of mass of the first permanent magnet, each of the second permanent magnets, and each of the third permanent magnets in each of the magnetic sets is not concentric with the center of circle of the inner annular surface.

7. The improved structure of high-frequency rotary mechanism as claimed in claim 1 , being a rotor element of a spindle motor.

8. The improved structure of high-frequency rotary mechanism as claimed in claim 7 , wherein each of the magnetic sets corresponds to a single pole of the spindle motor, and an angle of spread E of the first arcuate surface, an angle of spread F of the single pole, and a pole number P of the spindle motor, satisfy the following equations:
F= 360/ P, α=E/F× 100%, and α is between 50% and 98%.

9. The improved structure of high-frequency rotary mechanism as claimed in claim 1 , wherein the repulsion distance on a radial section of the body is shaped like a fan.

Assignees

• Hiwin Mikrosystem Corp

Inventors

• Nien Yu-Cheng
• Shiao Ruei-Bin
• Cheng Zhe-Wei

Classifications

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K1/276 Primary

  Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] · CPC title