CN-122001124-A - Permanent magnet synchronous motor and rotor pressing plate thereof

CN122001124ACN 122001124 ACN122001124 ACN 122001124ACN-122001124-A

Abstract

The present disclosure provides a permanent magnet synchronous motor and a rotor platen thereof. The rotor pressing plate is applied to a motor, the motor further comprises a rotor iron core, at least two permanent magnets are arranged on the rotor iron core, a pressing plate body of the rotor pressing plate is made of a material with magnetic permeability larger than a magnetic permeability threshold, a magnetic barrier is arranged in a magnetic leakage area of the pressing plate body and used for blocking a magnetic leakage path of the permanent magnets through the rotor pressing plate, the magnetic barrier comprises a plurality of sections of magnetic barrier arcs connected end to end, the sections of magnetic barrier arcs have a constraint relation, and the constraint relation is determined according to at least one of the magnetic leakage occurrence range, the structural strength requirement of the rotor pressing plate and the mechanical strength of a rotor. The magnetic permeability of the pressure plate body can be made of any material larger than the magnetic permeability threshold, a special process is not needed to manufacture the stainless steel pressure plate, manufacturing cost and material cost can be saved, and magnetic barriers are arranged in the magnetic leakage area of the pressure plate body, so that magnetic leakage of the end part of the rotor can be effectively reduced.

Inventors

WU LIJIAN
ZHAO FANGWEI
ZHANG ZHENYANG
WANG WENZHI
YAO HUIJUN
LU LONGQUAN

Assignees

浙江大学
加西贝拉压缩机有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. The rotor pressing plate is characterized by being applied to a motor, and further comprises a rotor core, wherein at least two permanent magnets are arranged on the rotor core; the magnetic leakage area of the pressing plate body is provided with a magnetic barrier, and the magnetic barrier is used for blocking a leakage magnetic flux path of the permanent magnet passing through the rotor pressing plate; The magnetic barrier comprises a plurality of sections of magnetic barrier circular arcs connected end to end, wherein the sections of magnetic barrier circular arcs have a constraint relation, and the constraint relation is determined according to at least one of the occurrence range of magnetic leakage, the structural strength requirement of a rotor pressing plate and the mechanical strength of a rotor.
2. The rotor platen according to claim 1, wherein the platen body is provided with through holes corresponding to the permanent magnets, the through holes are sector-ring-shaped, and the magnetic flux leakage region includes: The shape of the magnetic barrier in the first sub-region is determined according to the shape of the permanent magnet opposite to the first sub-region; And/or a second subarea which is positioned on one side of the inner circular arc of the through hole and is opposite to the permanent magnet, wherein the shape of the magnetic barrier in the second subarea is determined according to the shape of the permanent magnet opposite to the second subarea; And/or a third sub-region which is positioned on one side of the inner circular arc of the through hole and is opposite to the region between the two permanent magnets.
3. The rotor platen of claim 2, wherein the shape of the first magnetic barrier in the first sub-region is determined from first, second, third, and fourth magnetic barrier arcs that are sequentially end-to-end, the first, second, third, and fourth magnetic barrier arcs having the following constraint relationship: ; ; ; R 1 、R 2 、R 3 and R 4 are respectively the radii of a first inner arc, a first outer arc, a first magnetic barrier arc and a second magnetic barrier arc of a first permanent magnet opposite to the first magnetic barrier, and the circle centers of the first inner arc, the first outer arc, the first magnetic barrier arc and the second magnetic barrier arc are all first circle centers; a 1 is the minimum distance from the first inner arc to the first magnetic barrier arc, a 2 is the minimum distance from the first magnetic barrier arc to the second magnetic barrier arc, a 3 is the minimum distance from the first outer arc to the second magnetic barrier arc, h m is the thickness of a permanent magnet, R 5 、R 6 is the radius of the second outer arc of a through hole close to the third magnetic barrier arc and the radius of the third magnetic barrier arc respectively, the centers of the second outer arc and the third magnetic barrier arc are both the second center of a circle, b 1 is the minimum distance from the second outer arc to the third magnetic barrier arc, R 7 、R 8 is the radius of the third outer arc of a through hole close to the fourth magnetic barrier arc and the radius of the fourth magnetic barrier arc respectively, the centers of the fourth outer arc and the third outer arc are both the third center of a circle, and b 2 is the minimum distance from the third outer arc to the fourth magnetic barrier arc.
4. The rotor pressing plate according to claim 3, wherein the center of the pressing plate body is further provided with a shaft hole, an included angle formed by the center of the shaft hole and the first center and the second center is 30 degrees, and/or an included angle formed by the center of the shaft hole and the first center and the third center is 30 degrees; And/or b 1 、b 2 、a 1 、a 3 、a 2 each satisfy a minimum distance of mechanical strength of a rotor of the motor.
5. The rotor pressing plate according to claim 2, wherein the center of the pressing plate body is further provided with a shaft hole, the shape of the second magnetic barrier located in the second sub-region is determined according to a fifth magnetic barrier arc, a sixth magnetic barrier arc, a seventh magnetic barrier arc and an eighth magnetic barrier arc which are sequentially connected end to end, and the fifth magnetic barrier arc, the sixth magnetic barrier arc, the seventh magnetic barrier arc and the eighth magnetic barrier arc have the following constraint relation: ; ; ; Wherein, R 9 、R 10 、R 11 and R 12 are respectively the radii of a second inner arc, a fourth outer arc, a fifth magnetic barrier arc and a sixth magnetic barrier arc of the permanent magnet opposite to the second magnetic barrier, and the circle centers of the second inner arc, the fourth outer arc, the fifth magnetic barrier arc and the sixth magnetic barrier arc are all fourth circle centers; d 1 is the minimum distance from the second inner arc to the fifth magnetic barrier arc, d 2 is the minimum distance from the fifth magnetic barrier arc to the sixth magnetic barrier arc, d 3 is the minimum distance from the fourth outer arc to the sixth magnetic barrier arc, h m is the thickness of the permanent magnet, R 14 、R ro is the radius of the seventh magnetic barrier arc and the outer diameter of the rotor core, respectively, the rotor core and the seventh magnetic barrier arc are concentric with the hole axis of the rotor platen, c 1 is the minimum distance from the outer edge of the rotor core to the seventh magnetic barrier arc, R 16 is the radius of the third inner arc close to the through hole of the eighth magnetic barrier arc, R 17 is the radius of the eighth magnetic barrier arc, the centers of the eighth magnetic barrier arc and the third inner arc are both the fifth center, and c 3 is the minimum distance from the third inner arc to the eighth magnetic barrier arc.
6. The rotor platen of claim 5, wherein the second sub-region includes two second magnetic barriers symmetrically distributed about a target symmetry axis, the target symmetry axis being a symmetry axis of permanent magnets opposite each of the two second magnetic barriers; and/or the distances from the fourth circle center and the fifth circle center to the circle center of the shaft hole are equal; And/or an included angle formed by the circle center of the shaft hole, the fourth circle center and the fifth circle center is 30 degrees.
7. The rotor platen of claim 5, wherein the third magnetic barrier of the third sub-region is shaped according to a ninth magnetic barrier arc, a tenth magnetic barrier arc, an eleventh magnetic barrier arc, and a twelfth magnetic barrier arc that are sequentially positioned end to end, the ninth magnetic barrier arc, the tenth magnetic barrier arc, the eleventh magnetic barrier arc, and the twelfth magnetic barrier arc having the following constraint relationship: ; Wherein R 13 is the radius of the ninth magnetic barrier arc, the center of the ninth magnetic barrier arc is the fourth center, g 1 is the minimum distance from the ninth magnetic barrier arc to the fourth outer arc; The minimum distance from the eleventh magnetic barrier arc to the twelfth magnetic barrier arc is set as the minimum distance, the eleventh magnetic barrier arc and the shaft hole are concentric, and the circle centers of the twelfth magnetic barrier arc are all fifth circle centers; a radial distance from the midpoint of the inner arc of the through hole to the edge of the rotor platen; The ninth magnetic barrier arc and the tenth magnetic barrier arc are symmetrically distributed about a target symmetry axis, wherein the target symmetry axis is the symmetry axis of the permanent magnet opposite to the two second magnetic barriers respectively.
8. The rotor platen according to claim 7, wherein c 1 、c 3 each satisfy a minimum distance of rotor mechanical strength of the motor.
9. The rotor platen according to any one of claims 1 to 8, wherein the platen body is axially offset from the rotor core by a target angle such that there is an overlap area of a partial area of each permanent magnet with the platen body; and/or the target angle θ satisfies the condition 0< θ <2π and θ+.k pi/p, k=1, 2,..2p-1, p is the pole pair number of the motor; and/or the material of the pressing plate body is silicon steel sheet.
10. A permanent magnet synchronous motor, characterized in that it comprises a rotor comprising a rotor platen according to any one of claims 1-9.

Description

Permanent magnet synchronous motor and rotor pressing plate thereof The application is a division of Chinese application patent with application date 2024, 11-month 07, application number 2024115848680 and name of permanent magnet synchronous motor and rotor pressing plate. Technical Field The disclosure relates to the technical field of motors, in particular to a permanent magnet synchronous motor and a rotor pressing plate thereof. Background The permanent magnet synchronous motor is widely applied to various fields of industry, household appliances and the like due to the advantages of high efficiency, high torque density, high power factor and the like. For a permanent magnet synchronous motor, magnetic steel is inserted into a magnetic steel groove in a rotor core, a rotor pressing plate is fixed at the end part of the rotor core through rivets, and the rotor pressing plate not only plays a role in fixing the magnetic steel in the axial direction, but also has direct influence on the stability, noise control and thermal management of the motor. In the prior art, the rotor pressing plate material of the motor is usually stainless steel, the rotor pressing plate comprises a pressing plate body, a shaft hole and a rivet hole, and special processes are required for manufacturing the stainless steel pressing plate, so that the manufacturing cost and the material cost are high. Disclosure of Invention The technical problem to be solved by the present disclosure is to overcome the above-mentioned drawbacks in the prior art, and provide a permanent magnet synchronous motor and a rotor pressing plate thereof. The technical problems are solved by the following technical scheme: The first aspect provides a rotor pressing plate, which is applied to a motor, and further comprises a rotor iron core, wherein at least two permanent magnets are arranged on the rotor iron core, a pressing plate body of the rotor pressing plate is made of a material with magnetic permeability larger than a magnetic permeability threshold, through holes corresponding to the permanent magnets are formed in the pressing plate body, the pressing plate body and the rotor iron core are staggered in the axial direction by a target angle, so that an overlapping area exists between part of each permanent magnet and the pressing plate body, a magnetic barrier is arranged in a magnetic leakage area of the pressing plate body, and the magnetic barrier is used for blocking a leakage magnetic flux path of the permanent magnet through the rotor pressing plate. Optionally, the through hole is in a sector ring shape, and the magnetic leakage area includes: The shape of the magnetic barrier in the first sub-region is determined according to the shape of the permanent magnet opposite to the first sub-region; And/or a second subarea which is positioned on one side of the inner circular arc of the through hole and is opposite to the permanent magnet, wherein the shape of the magnetic barrier in the second subarea is determined according to the shape of the permanent magnet opposite to the second subarea; And/or a third sub-region which is positioned on one side of the inner circular arc of the through hole and is opposite to the region between the two permanent magnets. Optionally, the shape of the first magnetic barrier located in the first sub-region is determined according to a first magnetic barrier arc, a second magnetic barrier arc, a third magnetic barrier arc and a fourth magnetic barrier arc which are sequentially connected end to end, and the first magnetic barrier arc, the second magnetic barrier arc, the third magnetic barrier arc and the fourth magnetic barrier arc have the following constraint relationship: ;;; R 1、R2、R3 and R 4 are respectively the radii of a first inner arc, a first outer arc, a first magnetic barrier arc and a second magnetic barrier arc of a first permanent magnet opposite to the first magnetic barrier, and the circle centers of the first inner arc, the first outer arc, the first magnetic barrier arc and the second magnetic barrier arc are all first circle centers; a 1 is the minimum distance from the first inner arc to the first magnetic barrier arc, a 2 is the minimum distance from the first magnetic barrier arc to the second magnetic barrier arc, a 3 is the minimum distance from the first outer arc to the second magnetic barrier arc, h m is the thickness of a permanent magnet, R 5、R6 is the radius of the second outer arc of a through hole close to the third magnetic barrier arc and the radius of the third magnetic barrier arc respectively, the centers of the second outer arc and the third magnetic barrier arc are both the second center of a circle, b 1 is the minimum distance from the second outer arc to the third magnetic barrier arc, R 7、R8 is the radius of the third outer arc of a through hole close to the fourth magnetic barrier arc and the radius of the fourth magnetic barrier arc respectively, the centers of the fo