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

Abstract

The invention discloses a rotor protection sleeve based on a two-phase material and a preparation method, and relates to the technical field of motors. Comprising a sleeve body which is used for sleeving a 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 in a staggered manner; the magnetic conduction area is tightly attached to the permanent magnet of the rotor, the position of the symmetry plane of the magnetic conduction area coincides with the d-axis position of the rotor, and the position of the symmetry plane of the non-magnetic conduction area coincides with the q-axis position of the rotor. According to the invention, the problems of poor mechanical strength, serious flux leakage, high eddy-current loss, low air gap flux density and the like of the motor rotor can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor protection sleeve based on a dual-phase material and a preparation method thereof. Background Art

[0002] Compared with traditional permanent magnet motors, high-speed permanent magnet motors have shown excellent characteristics. Their power density is significantly higher and their volume is greatly reduced, which can not only greatly save the raw materials required for motor manufacturing, but also effectively reduce manufacturing costs. High-speed permanent magnet synchronous motors have obvious advantages, but there are also problems that cannot be avoided. High speed brings high mechanical stress to the rotor, and rotor protection measures are required to prevent the rotor from breaking when rotating at high speed. The rotor protection sleeve mainly adopts two types of metal materials and non-metallic composite materials. If a material with good magnetic conductivity is used as the rotor protection sleeve, it will increase the rotor leakage and reduce the output torque capacity of the motor. If a non-magnetic metal material is used as the rotor protection sleeve, it will reduce the air gap magnetic density of the motor and cause the motor torque output capacity to decrease. If a non-metallic material is used as the rotor protection sleeve, not only will there be a problem of low air gap magnetic density causing a decrease in the motor torque output capacity, but also poor thermal conductivity and unsatisfactory heat dissipation. Therefore, in order to improve the motor torque output capacity and rotor heat dissipation capacity, innovation is needed in the rotor protection sleeve. Summary of the invention

[0003] The main purpose of the present invention is to provide a rotor protection sleeve based on a dual-phase material and a preparation method thereof to solve the above-mentioned problems.

[0004] To achieve the above-mentioned purpose, the present invention provides a rotor protection sleeve based on a dual-phase material and a preparation method, including a sleeve body, wherein the sleeve body is used to be sleeved on the outside of the rotor; the sleeve 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 tightly fitted with the permanent magnets of the rotor, the symmetry plane position of the magnetic conductive areas coincides with the d-axis position of the rotor, and the symmetry plane position of the non-magnetic conductive areas coincides with the q-axis position of the rotor.

[0005] Furthermore, the sleeve body is formed by stacking multiple layers of sleeve laminations in the axial direction.

[0006] Furthermore, each layer of sleeve laminations is composed of multiple soft magnetic material laminations and multiple non-magnetic material laminations, and the multiple soft magnetic material laminations and the multiple non-magnetic material laminations are arranged alternately; the magnetic conductive area is composed of multiple layers of soft magnetic material laminations stacked together, and the non-magnetic conductive area is composed of multiple layers of non-magnetic material laminations stacked together.

[0007] Furthermore, for a motor rotor with a pole number of p, each layer of sleeve laminations is composed of p soft magnetic material laminations and p non-magnetic conductive material laminations.

[0008] Furthermore, 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 of the rotor permanent magnets.

[0009] The present invention also provides a method for preparing a rotor protection sleeve based on a dual-phase material, comprising the following steps: S1. Select soft magnetic materials and non-magnetic conductive materials, and cut or punch out soft magnetic material laminations and non-magnetic conductive material laminations; S2, alternately arranging the soft magnetic material laminations and the non-magnetic material laminations in the circumferential direction and welding them, thereby forming a sleeve lamination; S3. Laminating and pressing the multi-layer sleeve laminations in the axial direction to form a rotor protection sleeve based on a dual-phase material.

[0010] The present invention has the following beneficial effects: The present invention adopts axially laminated two-phase material as the rotor protection sleeve, sets a magnetic conductive area and a non-magnetic conductive area, reduces eddy current loss, increases air gap magnetic density, and improves motor efficiency. Compared with non-metallic material sleeves, the present invention has better heat dissipation performance; the magnetic conductive area of ​​the rotor protection sleeve uses soft magnetic material, which reduces the air gap length, thereby improving the torque output capacity of the motor. The present invention can solve the contradictions of poor mechanical strength of the motor rotor, serious magnetic leakage, high eddy current loss, and low air gap magnetic density. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the rotor protection sleeve and rotor structure based on dual-phase material of the surface-mounted high-speed permanent magnet motor in the present invention; Figure 2 It is a schematic diagram of a rotor protection sleeve based on a dual-phase material of a surface-mounted high-speed permanent magnet motor in the present invention; Figure 3 It is a schematic diagram of the rotor protection sleeve and rotor structure based on dual-phase materials of the "straight-line" permanent magnet structure internal high-speed permanent magnet motor of the present invention; Figure 4 It is a schematic diagram of a rotor protection sleeve based on a dual-phase material for a high-speed permanent magnet motor with an internal permanent magnet structure of a "straight" type in the present invention; Figure 5 It is a schematic diagram of a multi-segment arc surface rotor protection sleeve based on a dual-phase material for the "straight-line" permanent magnet structure internal high-speed permanent magnet motor of the present invention; Figure 6 It is a schematic diagram of the rotor protection sleeve and rotor structure based on dual-phase material of the "V-shaped" permanent magnet structure internal high-speed permanent magnet motor of the present invention; Figure 7It is a schematic diagram of a rotor protection sleeve based on a dual-phase material for a "V-shaped" permanent magnet structure internal high-speed permanent magnet motor in the present invention; Figure 8 It is a schematic diagram of the rotor protection sleeve and rotor structure based on dual-phase materials of the "U-shaped" permanent magnet structure internal high-speed permanent magnet motor of the present invention; Fig. 9 It is a schematic diagram of a rotor protection sleeve based on a dual-phase material for a high-speed permanent magnet motor with a "U-shaped" permanent magnet structure built-in in the present invention; Fig.10 It is a schematic diagram of the machining process of the rotor protection sleeve based on dual-phase material of the surface-mounted high-speed permanent magnet motor in the present invention; Fig.11 It is a schematic diagram of the machining process of the rotor protection sleeve based on dual-phase material of the "straight-line" permanent magnet structure internal high-speed permanent magnet motor in the present invention; Fig.12 It is a schematic diagram of the machining process of the rotor protection sleeve based on dual-phase material of the "V-shaped" permanent magnet structure internal high-speed permanent magnet motor in the present invention; Fig.13 It is a schematic diagram of the machining process of the rotor protection sleeve based on dual-phase material of the "U-shaped" permanent magnet structure internal high-speed permanent magnet motor in the present invention; Fig.14 It is the magnetic circuit model of a common internal permanent magnet motor; Fig.15 It is a magnetic circuit model of the interior permanent magnet motor with a rotor protection sleeve based on a dual-phase material in the present invention.

[0012] Among them: 1-rotor core; 2-permanent magnet; 3-non-magnetic region; 4-magnetic region; 5-soft magnetic material laminations; 6-non-magnetic material laminations; 7-sleeve laminations; 8-sleeve body. DETAILED DESCRIPTION

[0013] In order to achieve the above-mentioned purpose and effect, the technical means and structures adopted by the present invention are described in detail with reference to the accompanying drawings for the features and functions of the preferred embodiments of the present invention.

[0014] Example 1

[0015] Reference Figures 1 to 9The present invention provides a rotor protection sleeve based on a dual-phase material, comprising a sleeve body 8, the sleeve body 8 is used to be sleeved outside the rotor; the sleeve body 8 is divided into a plurality of magnetic conductive areas 4 and a plurality of non-magnetic conductive areas 3 in the circumferential direction; the plurality of magnetic conductive areas 4 are arranged alternately with the plurality of non-magnetic conductive areas 3; the magnetic conductive areas 4 are closely fitted with the permanent magnets 2 of the rotor, the symmetric plane position of the magnetic conductive areas 4 coincides with the d-axis position of the rotor, and the symmetric plane position of the non-magnetic conductive areas 3 coincides with the q-axis position of the rotor. The sleeve body 8 is formed by stacking multiple layers of sleeve laminations 7 in the axial direction. Each layer of sleeve laminations 7 is formed by splicing multiple soft magnetic material laminations 5 and multiple non-magnetic conductive material laminations 6, and the multiple soft magnetic material laminations 5 are arranged alternately with the multiple non-magnetic conductive material laminations 6; the magnetic conductive area 4 is composed of multiple layers of soft magnetic material laminations 5 stacked, and the non-magnetic conductive area 3 is composed of multiple layers of non-magnetic conductive material laminations 6 stacked. For a motor rotor with a pole number of p, each sleeve lamination layer 7 is composed of p soft magnetic material laminations 5 and p non-magnetic material laminations 6. The outer surface of the sleeve body 8 is a cylindrical surface or a multi-segment arc surface, and the inner surface is adapted to the arrangement of the rotor permanent magnets.

[0016] Reference Figure 1 and Figure 2 When installing the rotor protection sleeve based on dual-phase material used in the surface-mounted high-speed permanent magnet motor, the magnetic conductive area 4 fits tightly with the permanent magnet 2, and its symmetry plane position coincides with the d-axis position of the motor rotor, and the symmetry plane position of the non-magnetic conductive area 3 coincides with the q-axis position on the motor rotor.

[0017] Reference Figure 3 , Figure 4 and Figure 5 When installing the rotor protection sleeve based on dual-phase material used in the "one-line" permanent magnet structure internal high-speed permanent magnet motor, the magnetic conductive area 4 fits tightly with the permanent magnet 2, and its symmetry plane position coincides with the d-axis position of the motor rotor, and the symmetry plane position of the non-magnetic conductive area 3 coincides with the q-axis position on the motor rotor.

[0018] Reference Figure 6 and Figure 7 When installing the rotor protection sleeve based on dual-phase material used in the "V-shaped" permanent magnet structure internal high-speed permanent magnet motor, the magnetic conductive area 4 fits tightly with the permanent magnet 2, and its symmetry plane position coincides with the d-axis position of the motor rotor, and the symmetry plane position of the non-magnetic conductive area 3 coincides with the q-axis position on the motor rotor.

[0019] Reference Figure 8 and Fig. 9When installing the rotor protection sleeve based on dual-phase material used in the "U-shaped" permanent magnet structure internal high-speed permanent magnet motor, the magnetic conductive area 4 fits tightly with the permanent magnet 2, and its symmetry plane position coincides with the d-axis position of the motor rotor, and the symmetry plane position of the non-magnetic conductive area 3 coincides with the q-axis position on the motor rotor.

[0020] Among them, the soft magnetic material stack 5 can be made of high magnetic permeability, high saturation magnetic density silicon steel material, or silicon steel sheet with high mechanical strength and good saturation magnetic induction intensity; the non-magnetic material stack 6 is made of low magnetic permeability, high mechanical strength material, and stainless steel, aluminum alloy, copper alloy, titanium alloy and other materials with low saturation magnetic induction intensity can be selected. The mechanical strength of the material can be higher than that of silicon steel sheet, or lower than that of silicon steel sheet.

[0021] Example 2

[0022] The present invention also provides a method for preparing a rotor protection sleeve based on a dual-phase material, comprising the following steps: S1, selecting a soft magnetic material and a non-magnetic material, and cutting or punching out a soft magnetic material laminate 5 and a non-magnetic material laminate 6; S2, alternately arranging the soft magnetic material laminations 5 and the non-magnetic material laminations 6 in the circumferential direction and welding them, so as to form a sleeve lamination 7; the welding may be performed by argon arc welding, laser welding or electron beam welding; S3, stacking and molding the multi-layer sleeve laminations 7 in the axial direction to form a rotor protection sleeve based on a dual-phase material.

[0023] Reference Fig.14 and Fig.15 , the magnetic circuit model of the ordinary internal permanent magnet motor is compared with that of the internal permanent magnet motor with a rotor protection sleeve based on a dual-phase material in the present invention. The two adjacent magnetic poles of the ordinary internal permanent magnet motor will produce leakage magnetic flux, and their magnetic paths are directly connected without passing through the stator. The two adjacent magnetic poles of the internal permanent magnet motor with a rotor protection sleeve based on a dual-phase material in the present invention do not produce leakage magnetic flux.

[0024] The principle of the present invention is as follows: soft magnetic material is used in the magnetic conductive area 4 of the rotor protection sleeve to reduce the length of the air gap and improve the efficiency of the motor; non-magnetic conductive material is used in the non-magnetic conductive area 3 of the rotor protection sleeve to reduce eddy current loss and leakage magnetic flux; a stacking molding method is used to further reduce eddy current loss; the materials used are all smaller slices with lower cost, saving production costs.

[0025] The above descriptions are only preferred embodiments of the present invention, not all embodiments. Anyone should be aware that any structural changes made under the inspiration of the present invention, and any technical solutions that are the same or similar to the present invention, belong to the protection scope of the present invention.

Claims

1. A rotor protection sleeve based on dual-phase material, characterized in that: It includes a sleeve body, which is used to be sleeved on the outside of the rotor; the sleeve body is divided into multiple magnetic conductive areas and multiple non-magnetic conductive areas in the circumferential direction; the multiple magnetic conductive areas and the multiple non-magnetic conductive areas are arranged alternately; the magnetic conductive areas are tightly fitted with the permanent magnets of the rotor, the symmetry plane position of the magnetic conductive areas coincides with the d-axis position of the rotor, and the symmetry plane position of the non-magnetic conductive areas coincides with the q-axis position of the rotor.

2. A rotor protection sleeve based on a dual-phase material as claimed in claim 1, characterized in that: The sleeve body is formed by stacking multiple layers of sleeve laminations in the axial direction.

3. A rotor protection sleeve based on a dual-phase material as claimed in claim 2, characterized in that: Each layer of sleeve laminations is composed of multiple soft magnetic material laminations and multiple non-magnetic material laminations, and the multiple soft magnetic material laminations and the multiple non-magnetic material laminations are arranged alternately; the magnetic conductive area is composed of multiple layers of soft magnetic material laminations stacked together, and the non-magnetic conductive area is composed of multiple layers of non-magnetic material laminations stacked together.

4. A rotor protection sleeve based on a dual-phase material as claimed in claim 3, characterized in that: For a motor rotor with a pole number of p, each layer of sleeve laminations is composed of p soft magnetic material laminations and p non-magnetic conductive material laminations.

5. A rotor protection sleeve based on a dual-phase material according to any one of claims 1 to 4, characterized in that: 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 of the rotor permanent magnets.

6. A method for preparing a rotor protection sleeve based on a dual-phase material, characterized in that: Used to prepare a rotor protection sleeve based on a dual-phase material as described in any one of claims 1 to 5; comprising the following steps: S1. Select soft magnetic materials and non-magnetic conductive materials, and cut or punch out soft magnetic material laminations and non-magnetic conductive material laminations; S2, alternately arranging the soft magnetic material laminations and the non-magnetic material laminations in the circumferential direction and welding them, thereby forming a sleeve lamination; S3. Laminating and pressing the multi-layer sleeve laminations in the axial direction to form a rotor protection sleeve based on a dual-phase material.

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