CN-224218168-U - Novel permanent magnet rotor and magnetic suspension motor

CN224218168UCN 224218168 UCN224218168 UCN 224218168UCN-224218168-U

Abstract

The utility model belongs to the technical field of magnetic suspension motors and discloses a novel permanent magnet rotor and a magnetic suspension motor, wherein the novel permanent magnet rotor comprises a connecting shaft which is longitudinally arranged, an upper permanent magnet rotor and a lower permanent magnet rotor which are vertically arranged at two ends of the connecting shaft, the upper permanent magnet rotor is provided with a first annular halbach array which is circumferentially arranged by at least two first magnet units, the lower permanent magnet rotor is provided with a second annular halbach array which is circumferentially arranged by at least two second magnet units, and the connecting shaft is of a non-magnetic conductive structure. The magnetic suspension motor comprises a stator and the novel permanent magnet rotor arranged at the center of the stator. The novel permanent magnet rotor optimizes a magnetic field structure through the annular halbach arrays arranged on the upper permanent magnet rotor and the lower permanent magnet rotor, improves the magnetic field utilization rate of permanent magnet materials, can increase the output torque of the motor, and can also reduce the cogging torque, so that torque fluctuation is reduced, and the running stability and the running efficiency of the motor are improved.

Inventors

CUI QINGWEN
Request for anonymity
YIN YANQIN

Assignees

槃实科技(深圳)有限公司

Dates

Publication Date: 20260508
Application Date: 20241230

Claims (10)

1. The novel permanent magnet rotor is characterized by comprising an upper permanent magnet rotor (11), a lower permanent magnet rotor (13) and a connecting shaft (12) connected between the upper permanent magnet rotor and the lower permanent magnet rotor, wherein the upper permanent magnet rotor is provided with at least two first magnet units (11 a) which are arranged in a surrounding mode, the lower permanent magnet rotor is provided with at least two second magnet units (13 a) which are arranged in a surrounding mode, the second annular halbach arrays are arranged in a surrounding mode, the first magnet units (11 a) and the second magnet units (13 a) are respectively formed by arrangement of more than three magnet blocks in different magnetizing directions, and the connecting shaft is of a non-magnetic conductive structure.
2. The novel permanent magnet rotor according to claim 1, wherein the upper permanent magnet rotor and the lower permanent magnet rotor are of annular structures which are coaxial up and down and are overlapped, and magnetizing directions of magnets with the upper permanent magnet rotor and the lower permanent magnet rotor overlapped in the axial projection positions are the same or opposite.
3. The novel permanent magnet rotor according to claim 1, wherein the first magnet unit (11 a) is formed by sequentially arranging a first magnet, a second magnet, a third magnet and a fourth magnet, wherein the first magnet is magnetized in a radial inward direction, the third magnet is magnetized in a radial outward direction, the second magnet is magnetized in a direction perpendicular to the first magnet and directed to the third magnet, and the fourth magnet is magnetized in a direction perpendicular to the third magnet and directed to the third magnet; The second magnet unit (13 a) is formed by sequentially arranging a magnet block five, a magnet block six, a magnet block seven and a magnet block eight, wherein the magnet block five is magnetized in a radial inward direction, the magnet block seven is magnetized in a radial outward direction, the magnet block six is magnetized in a direction perpendicular to the magnet block five and points to the magnet block seven, and the magnet block eight is magnetized in a direction perpendicular to the magnet block seven and points to the magnet block seven.
4. The novel permanent magnet rotor according to claim 3, wherein adjacent magnet blocks in the four magnet blocks of the first magnet unit are complementary in structure, all magnet blocks are spliced together to form a first annular halbach array, adjacent magnet blocks in the four magnet blocks of the second magnet unit are complementary in structure, and all magnet blocks are spliced together to form a second annular halbach array.
5. The novel permanent magnet rotor according to claim 4, wherein the first magnet unit has different structures of the first magnet, the second magnet, the third magnet and the fourth magnet, or the first magnet, the second magnet, the third magnet and the fourth magnet have the same structure, and the second magnet unit has different structures of the fifth magnet, the sixth magnet, the seventh magnet and the eighth magnet, or the fifth magnet, the sixth magnet, the seventh magnet and the eighth magnet have the same structure.
6. The novel permanent magnet rotor according to claim 4, wherein each magnet of the first magnet unit and the second magnet unit is a triangular prism, and an inner side or an outer side of the triangular prism facing the axis of the rotor is an arc surface.
7. The novel permanent magnet rotor of claim 4 wherein each magnet of the first and second magnet units is a sector ring post.
8. The novel permanent magnet rotor according to claim 4, wherein the first magnet unit and the third magnet unit have the same structure and are of inverted parabolic shape or petal-like shape with inward openings, two sides of the adjacent first magnet unit and the adjacent third magnet unit are connected and annularly arranged to form a flower-shaped inner ring of an annular array, the second magnet unit and the fourth magnet unit are filled in a gap between the adjacent first magnet unit and the third magnet unit to jointly form an annular halbach array, and the structure of the second magnet unit is identical with that of the first magnet unit.
9. The novel permanent magnet rotor according to claim 2, wherein the first magnet unit and the second magnet unit on the upper permanent magnet rotor (11) and the lower permanent magnet rotor (13) are arranged in a position overlapping or dislocation manner.
10. A magnetic suspension motor is characterized by comprising a stator and a novel permanent magnet rotor arranged in the center of the stator.

Description

Novel permanent magnet rotor and magnetic suspension motor Technical Field The utility model relates to the technical field of magnetic suspension motors, in particular to a novel permanent magnet rotor and a magnetic suspension motor. Background The magnetic suspension motor realizes the suspension of the rotor in the air gap through the magnetic force action between the stator and the rotor, so the magnetic suspension motor has the characteristics of no friction, no abrasion and no lubrication, and is developed and applied to high-speed and high-power occasions. The magnetic suspension motor is divided into a bearing magnetic suspension motor and a bearingless magnetic suspension motor, and the levitation force of the bearing magnetic suspension motor is provided by a single electromagnetic bearing. The bearingless magnetic suspension motor realizes active suspension control by using the stator winding and the permanent magnet rotor, and no additional magnetic suspension bearing is needed, so that the rotor is shorter in size, higher in critical rotation speed and high in output power, and because the rotor and the stator are not in mechanical contact, noise and abrasion in operation are small, pollution is also less, energy consumption of the motor is less, and operation efficiency and accuracy are also higher, the bearingless magnetic suspension motor is widely applied to various fields, such as fields of semiconductors, health care, intelligent home, industrial automation and the like. However, the existing magnetic suspension bearingless motor has the problems that the torque and the axial rigidity of a permanent magnet rotor are difficult to improve, the running stability of the rotor is insufficient at high speed and the magnetic field utilization rate is low in application. Accordingly, there is a need for further improvements in the art. Disclosure of utility model According to the novel permanent magnet rotor and the magnetic suspension motor, the annular halbach arrays are arranged on the upper permanent magnet rotor and the lower permanent magnet rotor, so that the magnetic field of the peripheral surface of the rotor near the stator end is directionally reinforced, the magnetic field utilization rate of the rotor is high, and the operation stability is high. The application provides a novel permanent magnet rotor which comprises an upper permanent magnet rotor, a lower permanent magnet rotor and a connecting shaft, wherein the upper permanent magnet rotor, the lower permanent magnet rotor and the connecting shaft are coaxially arranged up and down, the upper permanent magnet rotor is provided with a first annular halbach array which is formed by encircling a plurality of first magnet units, the lower permanent magnet rotor is provided with a second annular halbach array which is formed by encircling a plurality of second magnet units, the first magnet units and the second magnet units are respectively formed by arranging magnetic blocks in more than three different magnetizing directions, and the connecting shaft is of a non-magnetic conductive structure. Optionally, in the novel permanent magnet rotor, the upper permanent magnet rotor and the lower permanent magnet rotor are of annular structures which are coaxial up and down and are overlapped, and magnetizing directions of magnets with the upper permanent magnet rotor and the lower permanent magnet rotor overlapped at axial projection positions are the same or opposite. Optionally, in the novel permanent magnet rotor, the first magnet unit is formed by sequentially arranging a first magnet, a second magnet, a third magnet and a fourth magnet, wherein the first magnet is magnetized in a radial inward direction, the third magnet is magnetized in a radial outward direction, the second magnet is magnetized in a direction perpendicular to the first magnet and points to the third magnet, and the fourth magnet is magnetized in a direction perpendicular to the third magnet and points to the third magnet; The second magnet unit is formed by sequentially arranging a magnet fifth, a magnet sixth, a magnet seventh and a magnet eighth, wherein the magnet fifth is magnetized radially inwards, the magnet seventh is magnetized radially outwards, the magnet sixth is perpendicular to the magnet fifth and points to the magnet seventh, and the magnet eighth is perpendicular to the magnet seventh and points to the magnet seventh. The radial magnetization refers to pointing to the axle center or being far away from the axle center along the radial direction of the rotor. On the basis of the above, in the novel permanent magnet rotor, adjacent magnet blocks in the four magnet blocks of the first magnet unit are complementary in structure, all the magnet blocks are spliced together to form a first annular halbach array, adjacent magnet blocks in the four magnet blocks of the second magnet unit are complementary in structure, and all the magnet blocks are spliced t