CN119561287A - Rotor protection sleeve based on two-phase material and preparation method - Google Patents

Abstract

The present invention discloses a rotor protection sleeve based on a dual-phase material and a preparation method, and relates to the field of motor technology. The sleeve body comprises a sleeve main body, which is used to be sleeved on the outside of the rotor; the sleeve main body is divided into a plurality of magnetic conductive areas and a plurality of non-magnetic conductive areas in the circumferential direction; the plurality of magnetic conductive areas and the plurality of non-magnetic conductive areas are arranged alternately; the magnetic conductive areas are closely fitted with the permanent magnets of the rotor, the symmetric plane position of the magnetic conductive areas coincides with the d-axis position of the rotor, and the symmetric plane position of the non-magnetic conductive areas coincides with the q-axis position of the rotor. The present invention can solve the problems of poor mechanical strength of the motor rotor, severe magnetic leakage, high eddy current loss, low air gap magnetic density, etc.

Description

Rotor protection sleeve based on two-phase material and preparation method

Technical Field

The invention relates to the technical field of motors, in particular to a rotor protection sleeve based on a dual-phase material and a preparation method thereof.

Background

The high-speed permanent magnet motor exhibits excellent characteristics as compared with the conventional permanent magnet motor. The power density is remarkably higher, the volume is greatly reduced, raw materials required by motor manufacturing can be greatly saved, and the manufacturing cost can be effectively reduced. The high-speed permanent magnet synchronous motor has obvious advantages, but has unavoidable problems. The high rotational speed gives the rotor high mechanical stress problem, and rotor protection measures are required to avoid breakage when the rotor rotates at high speed. The rotor protective sleeve mainly adopts two types of metal materials and nonmetallic composite materials. If the material with good magnetic permeability is used as the rotor protection sleeve, the problems of increased rotor magnetic leakage, reduced motor output torque capacity and the like are brought; if the non-metallic material is used as the rotor protection sleeve, the problem of motor torque output capacity reduction caused by the reduction of the air gap magnetic density of the motor is caused, and if the non-metallic material is used as the rotor protection sleeve, the problem of motor torque output capacity reduction caused by the reduction of the air gap magnetic density is also caused, and meanwhile, the problems of poor heat conductivity and unsatisfactory heat dissipation effect are also caused. Therefore, in order to improve the motor torque output capability and rotor heat dissipation capability, innovations in rotor protection sleeves are required.

Disclosure of Invention

The invention mainly aims to provide a rotor protection sleeve based on a dual-phase material and a preparation method thereof so as to solve the problems.

The rotor protection sleeve comprises a sleeve main body, wherein the sleeve main body is used for being sleeved outside a rotor, the sleeve main body is divided into a plurality of magnetic conduction areas and a plurality of non-magnetic conduction areas in the circumferential direction, the magnetic conduction areas and the non-magnetic conduction areas are arranged in a staggered mode, the magnetic conduction areas are tightly attached to permanent magnets of the rotor, the symmetrical plane position of the magnetic conduction areas is overlapped with the d-axis position of the rotor, and the symmetrical plane position of the non-magnetic conduction areas is overlapped with the q-axis position of the rotor.

Further, the sleeve body is formed by stacking a plurality of sleeve laminations in the axial direction.

Furthermore, each sleeve lamination is formed by splicing a plurality of soft magnetic material laminations and a plurality of non-magnetic conductive material laminations, the soft magnetic material laminations and the non-magnetic conductive material laminations are arranged in a staggered mode, the magnetic conductive area is formed by laminating a plurality of layers of soft magnetic material laminations, and the non-magnetic conductive area is formed by laminating a plurality of layers of non-magnetic conductive material laminations.

Further, for a motor rotor having a pole number p, each lamination sleeve lamination consists of p soft magnetic material laminations and p non-magnetic material laminations.

Further, the outer surface of the sleeve body is a cylindrical surface or a multi-section arc surface, and the inner surface is matched with the arrangement form of the rotor permanent magnet.

The invention also provides a preparation method of the rotor protection sleeve based on the two-phase material, which comprises the following steps:

S1, selecting soft magnetic materials and non-magnetic materials, and cutting or blanking to form soft magnetic material laminates and non-magnetic material laminates;

s2, sequentially staggering and welding the soft magnetic material lamination and the non-magnetic material lamination along the circumferential direction so as to form a sleeve lamination;

And S3, stacking and forming the multi-layer sleeve lamination along the axial direction, so as to form the rotor protection sleeve based on the dual-phase material.

The invention has the following beneficial effects:

according to the invention, by adopting the axially laminated two-phase material as the rotor protection sleeve and arranging the magnetic conduction region and the non-magnetic conduction region, the eddy current loss is reduced, the air gap magnetic density is improved, and the motor efficiency is improved. Compared with a sleeve made of non-metal materials, the rotor protection sleeve has better heat dissipation performance, and the magnetically conductive area of the rotor protection sleeve is made of soft magnetic materials, so that the length of an air gap is reduced, and the torque output capacity of the motor is improved. The invention can solve the contradiction problems of poor mechanical strength, serious magnetic leakage, high eddy current loss, low air gap magnetic density and the like of the motor rotor.

Drawings

Fig. 1 is a schematic diagram of a rotor protection sleeve and a rotor structure of a surface-mounted high-speed permanent magnet motor based on a dual-phase material;

fig. 2 is a schematic diagram of a rotor protection sleeve based on a dual-phase material for a surface-mounted high-speed permanent magnet motor according to the present invention;

fig. 3 is a schematic diagram of a rotor protection sleeve and a rotor structure based on a dual-phase material of the high-speed permanent magnet motor with an in-line permanent magnet structure;

fig. 4 is a schematic diagram of a rotor protection sleeve based on a dual-phase material of a high-speed permanent magnet motor with an in-line permanent magnet structure;

Fig. 5 is a schematic diagram of a multi-segment arc surface rotor protection sleeve based on a dual-phase material of the high-speed permanent magnet motor with an in-line permanent magnet structure;

fig. 6 is a schematic diagram of a rotor protection sleeve and a rotor structure based on a dual-phase material of a high-speed permanent magnet motor with a built-in V-shaped permanent magnet structure in the invention;

fig. 7 is a schematic diagram of a rotor protection sleeve based on a dual-phase material of a high-speed permanent magnet motor with a built-in "V-shaped" permanent magnet structure in the present invention;

Fig. 8 is a schematic diagram of a rotor protection sleeve and a rotor structure based on a dual-phase material of a high-speed permanent magnet motor with a built-in U-shaped permanent magnet structure in the invention;

fig. 9 is a schematic diagram of a rotor protection sleeve based on a dual-phase material of a high-speed permanent magnet motor with a built-in "U-shaped" permanent magnet structure in the invention;

FIG. 10 is a schematic diagram of a process for manufacturing a rotor protection sleeve based on a dual phase material for a surface mounted high speed permanent magnet motor according to the present invention;

FIG. 11 is a schematic diagram of a processing process of a rotor protection sleeve based on a dual-phase material for a high-speed permanent magnet motor with an in-line permanent magnet structure;

FIG. 12 is a schematic diagram of a processing process of a rotor protection sleeve based on a dual-phase material for a high-speed permanent magnet motor with a built-in V-shaped permanent magnet structure;

FIG. 13 is a schematic diagram of a processing process of a rotor protection sleeve based on a dual-phase material for a high-speed permanent magnet motor with a built-in U-shaped permanent magnet structure;

FIG. 14 is a magnetic circuit model of a conventional interior permanent magnet motor;

Fig. 15 is a magnetic circuit model of an in-house permanent magnet motor with a rotor protection sleeve based on a two-phase material according to the present invention.

The magnetic field generator comprises a 1-rotor core, a 2-permanent magnet, a 3-non-magnetic conduction area, a 4-magnetic conduction area, a 5-soft magnetic material lamination, a 6-non-magnetic conduction material lamination, a 7-sleeve lamination and an 8-sleeve main body.

Detailed Description

In order to achieve the above objects and effects, the present invention adopts the technical means and structure, and the features and functions of the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1

Referring to fig. 1 to 9, the rotor protection sleeve based on the dual-phase material comprises a sleeve main body 8, wherein the sleeve main body 8 is used for being sleeved outside a rotor, the sleeve main body 8 is divided into a plurality of magnetic conduction areas 4 and a plurality of non-magnetic conduction areas 3 in the circumferential direction, the plurality of magnetic conduction areas 4 and the plurality of non-magnetic conduction areas 3 are arranged in a staggered mode, the magnetic conduction areas 4 are tightly attached to a permanent magnet 2 of the rotor, the symmetrical plane position of the magnetic conduction areas 4 is overlapped with the d-axis position of the rotor, and the symmetrical plane position of the non-magnetic conduction areas 3 is overlapped with the q-axis position of the rotor. The sleeve body 8 is formed by stacking a plurality of sleeve laminations 7 in the axial direction. Each sleeve lamination 7 is formed by splicing a plurality of soft magnetic material laminations 5 and a plurality of non-magnetic conductive material laminations 6, the soft magnetic material laminations 5 and the non-magnetic conductive material laminations 6 are arranged in a staggered mode, the magnetic conductive area 4 is formed by laminating a plurality of layers of soft magnetic material laminations 5, and the non-magnetic conductive area 3 is formed by laminating a plurality of layers of non-magnetic conductive material laminations 6. For a motor rotor with a pole number p, each sleeve lamination 7 consists of p laminations 5 of soft magnetic material and p laminations 6 of non-magnetically conductive material. The outer surface of the sleeve main body 8 is a cylindrical surface or a multi-section arc surface, and the inner surface is matched with the arrangement form of the rotor permanent magnet.

Referring to fig. 1 and 2, when a rotor protection sleeve based on a dual-phase material applied to a surface-mounted high-speed permanent magnet motor is installed, a magnetic conduction region 4 is tightly attached to a permanent magnet 2, the position of a symmetry plane of the rotor protection sleeve coincides with the d-axis position of the motor rotor, and the position of a symmetry plane of a non-magnetic conduction region 3 coincides with the q-axis position on the motor rotor.

Referring to fig. 3, 4 and 5, when the rotor protection sleeve based on the diphase material applied to the high-speed permanent magnet motor with the built-in permanent magnet structure in the shape of a straight line is installed, the magnetic conduction area 4 is tightly attached to the permanent magnet 2, the symmetrical plane position of the magnetic conduction area is overlapped with the d-axis position of the motor rotor, and the symmetrical plane position of the non-magnetic conduction area 3 is overlapped with the q-axis position on the motor rotor.

Referring to fig. 6 and 7, when the rotor protection sleeve based on the dual-phase material applied to the high-speed permanent magnet motor with the built-in type V-shaped permanent magnet structure is installed, the magnetic conduction area 4 is closely attached to the permanent magnet 2, the symmetrical plane position of the rotor coincides with the d-axis position of the motor rotor, and the symmetrical plane position of the non-magnetic conduction area 3 coincides with the q-axis position on the motor rotor.

Referring to fig. 8 and 9, when the rotor protection sleeve based on the dual-phase material applied to the high-speed permanent magnet motor with the built-in U-shaped permanent magnet structure is installed, the magnetic conduction area 4 is closely attached to the permanent magnet 2, the symmetrical plane position of the rotor coincides with the d-axis position of the motor rotor, and the symmetrical plane position of the non-magnetic conduction area 3 coincides with the q-axis position on the motor rotor.

The soft magnetic material lamination 5 can be made of high-permeability and high-saturation magnetic density silicon steel material, or can be made of silicon steel sheet with high mechanical strength and better saturation magnetic induction strength, the non-magnetic material lamination 6 can be made of low-permeability and high-mechanical strength material, or can be made of stainless steel, aluminum alloy, copper alloy, titanium alloy and other materials with low saturation magnetic induction strength, and the mechanical strength of the material can be higher than that of the silicon steel sheet or lower than that of the silicon steel sheet.

Example 2

The invention also provides a preparation method of the rotor protection sleeve based on the two-phase material, which comprises the following steps:

S1, selecting soft magnetic materials and non-magnetic materials, and cutting or blanking to form soft magnetic material laminates 5 and non-magnetic material laminates 6;

s2, sequentially staggering and welding the soft magnetic material lamination 5 and the non-magnetic material lamination 6 along the circumferential direction to form a sleeve lamination 7, wherein argon arc welding, laser welding or electron beam welding can be adopted for welding;

And S3, stacking and forming the multi-layer sleeve lamination 7 along the axial direction, so as to form the rotor protection sleeve based on the dual-phase material.

Referring to fig. 14 and 15, a conventional interior permanent magnet motor is compared with a magnetic circuit model of the interior permanent magnet motor with a rotor protection sleeve based on a dual phase material according to the present invention, two adjacent poles of the conventional interior permanent magnet motor generate magnetic leakage, and magnetic circuit lines thereof are directly connected without passing through a stator. The two adjacent magnetic poles of the built-in permanent magnet motor with the rotor protection sleeve based on the dual-phase material have no magnetic leakage.

The principle of the invention is that soft magnetic materials are used in the magnetic conduction area 4 of the rotor protection sleeve, the length of an air gap is reduced, the motor efficiency is improved, non-magnetic materials are used in the non-magnetic conduction area 3 of the rotor protection sleeve, the eddy current loss is reduced, the magnetic leakage is reduced, the eddy current loss is further reduced by adopting a lamination forming method, the adopted materials are smaller slices, the cost is lower, and the manufacturing cost is saved.

The foregoing is only illustrative of the preferred embodiment, and not all embodiments, of the present invention, and it is to be understood that variations in the structure of the present invention may be made by those skilled in the art, all technical schemes which are the same or similar to the invention belong to the protection scope of the invention.

Claims (6)

1. A rotor protection sleeve based on a dual-phase material is characterized by comprising a sleeve body, wherein the sleeve body is used for being sleeved outside a rotor, the sleeve body is divided into a plurality of magnetic conduction areas and a plurality of non-magnetic conduction areas in the circumferential direction, the magnetic conduction areas and the non-magnetic conduction areas are arranged in a staggered mode, the magnetic conduction areas are tightly attached to permanent magnets of the rotor, the symmetrical plane position of the magnetic conduction areas coincides with the d-axis position of the rotor, and the symmetrical plane position of the non-magnetic conduction areas coincides with the q-axis position of the rotor.

2. A dual phase material based rotor protection sleeve according to claim 1, wherein the sleeve body is laminated in an axial direction from a multi-layer sleeve stack.

3. The rotor protective sleeve of claim 2 wherein each sleeve lamination is formed by splicing a plurality of soft magnetic material laminations and a plurality of non-magnetically permeable material laminations, the plurality of soft magnetic material laminations and the plurality of non-magnetically permeable material laminations are staggered, the magnetically permeable region is formed by stacking a plurality of layers of soft magnetic material laminations, and the non-magnetically permeable region is formed by stacking a plurality of layers of non-magnetically permeable material laminations.

4. A rotor protection sleeve based on a two-phase material according to claim 3, characterized in that for a motor rotor with a pole number p, each sleeve lamination consists of p laminations of soft magnetic material and p laminations of non-magnetically conductive material.

5. A rotor protection sleeve based on a dual phase material according to any one of claims 1-4, wherein the outer surface of the sleeve body is a cylindrical surface or a multi-segment arc surface, and the inner surface is adapted to the arrangement form of the rotor permanent magnets.

6. A method for preparing a rotor protection sleeve based on a dual phase material, characterized by being used for preparing a rotor protection sleeve based on a dual phase material according to any one of claims 1-5, comprising the following steps:

S1, selecting soft magnetic materials and non-magnetic materials, and cutting or blanking to form soft magnetic material laminates and non-magnetic material laminates;

s2, sequentially staggering and welding the soft magnetic material lamination and the non-magnetic material lamination along the circumferential direction so as to form a sleeve lamination;

And S3, stacking and forming the multi-layer sleeve lamination along the axial direction, so as to form the rotor protection sleeve based on the dual-phase material.