Reluctance rotor structure based on biphase material, preparation method and permanent magnet auxiliary synchronous reluctance rotor structure

Abstract

The invention discloses a reluctance rotor structure based on a two-phase material, a preparation method and a permanent magnet auxiliary synchronous reluctance rotor structure, and belongs to the technical field of motors. The iron core comprises multiple layers of rotor laminations, and the multiple layers of rotor laminations extend in the axial direction of the rotating shaft and are sequentially laminated; each layer of rotor lamination comprises a plurality of iron core cutting sheets, one of the iron core cutting sheets fixedly sleeves the outer side of the rotating shaft, and the other iron core cutting sheets are sequentially spliced along the radial direction of the rotating shaft and are connected with the iron core cutting sheet at the innermost layer; wherein the iron core cutting sheets comprise high-magnetic-conductivity iron core cutting sheets and low-magnetic-conductivity iron core cutting sheets; the high-magnetic-conductivity iron core cutting sheets and the low-magnetic-conductivity iron core cutting sheets are sequentially spliced in a staggered mode and sequentially extend in the radial direction of the rotating shaft, and the low-magnetic-conductivity iron core cutting sheets serve as rotor magnetic barriers to form a magnetic resistance rotor structure of a double-phase material. The magnetic bridge magnetic resistance is high, the rotor mechanical strength is high, and high-speed operation can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a reluctance rotor structure based on a dual-phase material, a preparation method and a permanent magnet assisted synchronous reluctance rotor structure. Background Art

[0002] Benefiting from the high magnetic energy product and high remanence of rare earth permanent magnet materials represented by NdFeB and SmCo, rare earth permanent magnet motors have the advantages of high power factor, high power density and high efficiency. They are widely used in many fields such as new energy vehicles and servos, and have become the representative of high-efficiency and energy-saving motors. In order to reduce the dependence on rare earth permanent magnet materials and reduce the impact of rare earth mining on the environment, synchronous reluctance motors are becoming the focus of research.

[0003] In order to reduce magnetic flux leakage and increase the salient pole ratio, traditional synchronous reluctance motors usually construct magnetic bridges and magnetic barriers by digging out the core material, and reduce magnetic flux leakage by reducing the thickness of the magnetic bridge to saturate it. In theory, the smaller the thickness of the magnetic isolation bridge, the greater the magnetic resistance and the better the magnetic isolation effect. However, a motor with a narrow magnetic bridge will have stress concentration problems under high-speed rotation, and may even break, limiting the increase in motor speed. In addition, the traditional rotor core uses a single-characteristic silicon steel sheet, which cannot meet the requirements of low magnetic leakage and high mechanical strength in the magnetic bridge area. Summary of the invention

[0004] In order to solve the above problems, the present invention adopts the following technical solutions:

[0005] A reluctance rotor structure based on a dual-phase material, comprising:

[0006] Rotating shaft;

[0007] The core comprises a plurality of rotor laminations, the plurality of rotor laminations extending along the axial direction of the rotating shaft and being stacked in sequence; each layer of the rotor laminations comprises a plurality of core slices, one of which is fixedly sleeved on the outer side of the rotating shaft, and the remaining core slices are spliced ​​in sequence along the radial direction of the rotating shaft and connected to the innermost core slice;

[0008] Among them, the core slices include high-permeability core slices and low-permeability core slices; the high-permeability core slices and the low-permeability core slices are spliced ​​alternately in sequence and extend in sequence along the radial direction of the rotating shaft, and the low-permeability core slices serve as rotor magnetic barriers to form a reluctance rotor structure of a dual-phase material.

[0009] Furthermore, a plurality of the rotor magnetic barriers and the high-permeability core slices which are staggered and spliced ​​in sequence are arranged along the circumferential direction of the rotating shaft to form the reluctance rotor structure with one pair of poles or multiple pairs of poles.

[0010] Furthermore, the shape of the rotor magnetic barrier is adapted to the shape of the high permeability core slice; the shape of the rotor magnetic barrier is symmetrical or asymmetrical "U-shaped", "V-shaped", "C-shaped" or a combination of multiple shapes.

[0011] Furthermore, the ends of the high-permeability core slices and the ends of the rotor magnetic barriers are both arranged on the outer circumference of the reluctance rotor structure.

[0012] Furthermore, a method for preparing a reluctance rotor structure based on a dual-phase material is the method for preparing a reluctance rotor structure based on a dual-phase material as described in any one of the above items, and the method comprises the following steps:

[0013] S1, cutting high permeability core slices and rotor magnetic barriers into required shapes;

[0014] S2. Arrange the cut high-permeability core slices and rotor magnetic barriers according to the connection sequence of the rotor magnetic barriers and high-permeability core slices as described in any one of claims 1 to 4, and use argon arc, laser or electron beam to weld the high-permeability core slices and rotor magnetic barriers in the arrangement sequence to form rotor laminations. Multiple rotor laminations extend in the axial direction and are stacked in sequence to form a reluctance rotor structure based on a dual-phase material.

[0015] Furthermore, a permanent magnet assisted synchronous reluctance rotor structure based on dual-phase material includes a permanent magnet assisted synchronous reluctance rotor structure based on dual-phase material, and the reluctance rotor structure based on dual-phase material in the permanent magnet assisted synchronous reluctance rotor structure based on dual-phase material is the reluctance rotor structure based on dual-phase material described in any of the above items.

[0016] Furthermore, permanent magnet slots are provided on the rotor magnetic barrier.

[0017] Furthermore, it also includes a permanent magnet; the permanent magnet is arranged in the permanent magnet slot.

[0018] Beneficial effects:

[0019] The present invention provides a reluctance rotor structure based on a dual-phase material. Compared with the prior art, the present invention adopts an alloy material with poor magnetic conductivity instead of air as a rotor magnetic barrier, thereby reducing leakage magnetic flux and increasing the salient pole ratio. On the basis of ensuring the magnetic resistance and magnetic isolation effects, it prevents the occurrence of cracks, thereby increasing the rotation speed of the motor and fundamentally solving the problems of severe magnetic leakage in the rotor magnetic bridge area and low mechanical strength of the rotor. The processing method of the reluctance rotor structure of the dual-phase material described in the present invention has the advantages of low processing difficulty, low cost, a wide range of material selection, and the physical properties of the material are less affected by processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a structural schematic diagram of the connection between the high-permeability core slices and the rotating shaft of the "U-shaped" reluctance rotor structure with multiple poles based on dual-phase materials in the present invention;

[0021] Figure 2 It is a schematic structural diagram of the connection between the rotor magnetic barrier and the rotating shaft of the "U-shaped" reluctance rotor structure with multiple pairs of poles based on dual-phase materials in the present invention;

[0022] Figure 3 It is a structural schematic diagram of a high-permeability core slice of a pair of poles of a "U-shaped" reluctance rotor structure based on a dual-phase material and connected to a rotating shaft in the present invention;

[0023] Figure 4 It is a structural schematic diagram of the connection between the high-permeability core slice and the rotating shaft of the "C-type" reluctance rotor structure based on dual-phase material in the present invention;

[0024] Figure 5 It is a structural schematic diagram of the connection between the high-permeability core slices of the multi-pole "V-shaped" reluctance rotor structure based on dual-phase material and the rotating shaft in the present invention;

[0025] Figure 6 It is a structural schematic diagram of the connection between the high-permeability core slice and the rotating shaft of the "C-type" permanent magnet assisted synchronous reluctance rotor structure with multiple poles based on dual-phase materials in Example 2;

[0026] Figure 7 It is a structural schematic diagram of the connection between the high-permeability core slices and the rotating shaft of the "U-shaped" permanent magnet assisted synchronous reluctance rotor structure with multiple poles based on dual-phase materials in Example 2;

[0027] Figure 8 It is a structural schematic diagram of the connection between the high-permeability core slices and the rotating shaft of the "V-shaped" permanent magnet assisted synchronous reluctance rotor structure with multiple pole pairs based on dual-phase materials in Example 2;

[0028] Fig. 9 It is a structural schematic diagram of the connection between the high-permeability core slices and the rotating shaft of the "U-shaped" permanent magnet assisted synchronous reluctance rotor structure with multiple poles based on dual-phase materials in Example 3;

[0029] Fig.10 It is a schematic diagram of the processing process of the structure of connecting the high-permeability core slices and the rotating shaft of the "U-shaped" reluctance rotor structure with multiple poles based on dual-phase materials in Example 4;

[0030] Fig.11 It is a schematic diagram of the processing process of the structure of connecting the rotor magnetic barrier and the rotating shaft of the "U-shaped" reluctance rotor structure with multiple pairs of poles based on dual-phase materials in Example 4;

[0031] Among them, 1. weak magnetic conductivity area; 2. strong magnetic conductivity area; 3. rotating shaft; 4. permanent magnet; 5. rotor laminations; 6. iron core; 7. rotor magnetic barrier; 8. high magnetic conductivity core slice; 9. rotor iron core magnetic bridge. DETAILED DESCRIPTION

[0032] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below.

[0033] Example 1

[0034] Reference Figures 1 to 5 , a reluctance rotor structure based on a dual-phase material, comprising:

[0035] Axis 3;

[0036] The core 6 includes a plurality of rotor laminations 5, which extend in the axial direction of the rotating shaft 3 and are stacked in sequence; each layer of the rotor laminations 5 includes a plurality of core slices, one of which is fixedly sleeved on the outer side of the rotating shaft, and the remaining core slices are spliced ​​in sequence along the radial direction of the rotating shaft and connected to the innermost core slice;

[0037] Among them, the core slices include high-permeability core slices 8 and low-permeability core slices; the high-permeability core slices 8 and the low-permeability core slices are spliced ​​alternately in sequence and extend in sequence along the radial direction of the rotating shaft 3. The low-permeability core slices serve as rotor magnetic barriers 7 to form a reluctance rotor structure of a dual-phase material.

[0038] Among them, preferably, the high permeability core slice 8 is made of high magnetic permeability, high saturation magnetic density silicon steel strip, and the rotor magnetic barrier 7 is made of low magnetic permeability, high mechanical strength alloy strip; the alloy material with poor magnetic conductivity can be selected from stainless steel, aluminum alloy, copper alloy, titanium alloy and other materials with low saturation magnetic induction intensity, and the mechanical strength of the material can be higher than or lower than the silicon steel sheet; the silicon steel material with strong magnetic conductivity can also be selected from silicon steel sheets with high mechanical strength and good saturation magnetic induction intensity.

[0039] In this embodiment, if Figure 1 As shown, a high magnetic permeability core slice 8 is provided with an opening at its center and is fixedly sleeved on the outer side of the rotating shaft 3. A plurality of rotor magnetic barriers 7 are evenly arranged along the circumference of the high magnetic permeability core slice 8 and are connected to the high magnetic permeability core slice 8. In the radial direction of each rotor magnetic barrier 7, a plurality of rotor magnetic barriers 7 and a plurality of high magnetic permeability core slices 8 are staggered and spliced ​​in sequence along the radial direction; at this time, the high magnetic permeability core slice 8 is a strong magnetic permeability area 2, and the area covered by the rotor magnetic barrier 7 is a weak magnetic permeability area 1.

[0040] In another embodiment, if Figure 2 As shown, a rotor magnetic barrier slice 7 is provided with an opening at its center and is fixedly sleeved on the outer side of the rotating shaft 3. A plurality of high magnetic permeability core slices 8 are evenly arranged along the circumference of the rotor magnetic barrier 7 and connected to the rotor magnetic barrier 7. In the radial direction of each rotor magnetic barrier 7, a plurality of rotor magnetic barriers 7 and a plurality of high magnetic permeability core slices 8 are arranged in a radially staggered manner in sequence; at this time, the high magnetic permeability core slice 8 is a strong magnetic permeability area 2, and the area covered by the rotor magnetic barrier 7 is a weak magnetic permeability area 1.

[0041] Through the above technical scheme, the area on the core 6 where the rotor magnetic barrier 7 is located is the weak magnetic permeability area 1 of the rotor core, and the area on the core 6 not covered by the rotor magnetic barrier 7 is the strong magnetic permeability area 2 of the rotor core; the core 6 is made of a two-phase material, which is composed of a high magnetic permeability, high saturation magnetic density silicon steel strip and a low magnetic permeability, high mechanical strength alloy strip arranged and welded in a certain manner, or the area of ​​the silicon steel strip that needs to obtain non-magnetic properties is nitrided to convert it into a non-magnetic material, or the two-phase material is prepared by sintering and forging.

[0042] In this embodiment, a plurality of rotor magnetic barriers 7 and high permeability core slices 8 are arranged along the circumference of the rotating shaft 3 and are staggered and spliced ​​in sequence to form a reluctance rotor structure with one pair of poles or multiple pairs of poles.

[0043] In this embodiment, the shape of the rotor magnetic barrier 7 is adapted to the shape of the high permeability core slice 8; the shape of the rotor magnetic barrier 7 is symmetrical or asymmetrical "U-shaped", "V-shaped", "C-shaped" or a combination of various shapes.

[0044] Among them, the rotor magnetic barrier 7 has a "U-shaped" or "C-shaped" or "V-shaped" structure, so that the rotor weak magnetic conductivity area 1 has a shape of "U-shaped", "C-shaped", "V-shaped" or a combination of multiple shapes.

[0045] The shape of the innermost rotor magnetic barrier 7 matches the shape of the high-permeability core slice 8 , and the shape of the rotor magnetic barrier 7 matches the shape of the rotor magnetic barrier 7 .

[0046] In this embodiment, the ends of the high-permeability core slices 8 and the ends of the rotor flux barriers 7 are both arranged on the outer circumference of the reluctance rotor structure.

[0047] The length of the multi-layer rotor magnetic barrier 7 gradually decreases along the radial direction of the rotating shaft 3 ; the length of the innermost rotor magnetic barrier 7 is greater than the length of the outermost rotor magnetic barrier 7 .

[0048] Example 2

[0049] Reference Figures 6 to 8, a permanent magnet assisted synchronous reluctance rotor structure based on two-phase material, including a permanent magnet assisted synchronous reluctance rotor structure based on two-phase material, the reluctance rotor structure based on two-phase material in the permanent magnet assisted synchronous reluctance rotor structure based on two-phase material is the reluctance rotor structure based on two-phase material in Example 1.

[0050] In this embodiment, permanent magnet slots are provided on the rotor flux barrier 7 .

[0051] The permanent magnet slots are obtained by slotting in the weak magnetic conductivity area 1 of the reluctance rotor lamination based on the dual-phase material, and the slot positions can be selected as required.

[0052] In this embodiment, the permanent magnet assisted synchronous reluctance rotor structure based on dual-phase material further includes a permanent magnet 4; the permanent magnet 4 is arranged in the permanent magnet slot.

[0053] The permanent magnet slots may be one group or multiple groups; the rotor core magnetic bridge 9 is located on the weak magnetic conductive area 1 of the rotor core.

[0054] Reference Figure 6 and Figure 7 The rotor magnetic barrier 7 is an alloy strip. When cutting, the rotor magnetic barrier 7 is cut into C-shaped and U-shaped structures of different sizes. The arrangement of the multi-layer rotor magnetic barrier 7 is as follows: the length of the multi-layer rotor magnetic barrier 7 gradually decreases along the radial direction of the rotating shaft 3, and a permanent magnet slot is opened in the middle position of the rotor magnetic barrier 7 of the C-shaped and U-shaped structures, and the permanent magnet 4 is installed in the permanent magnet slot. The two ends of the permanent magnet slot in the rotor magnetic barrier 7 of the C-shaped and U-shaped structures are the rotor core magnetic bridge 9.

[0055] Reference Figure 8 The rotor magnetic barrier 7 is an alloy strip, and is cut into a V-shaped structure during cutting. The arrangement of the multi-layer rotor magnetic barrier 7 is as follows: the length of the multi-layer rotor magnetic barrier 7 gradually decreases along the radial direction of the rotating shaft 3, a permanent magnet slot is opened in the middle position of the rotor magnetic barrier 7 of the V-shaped structure, and the permanent magnet 4 is installed in the permanent magnet slot, and the two ends of the permanent magnet slot in the rotor magnetic barrier 7 of the V-shaped structure are the rotor core magnetic bridge 9.

[0056] The present invention provides a permanent magnet assisted synchronous reluctance rotor structure based on dual-phase materials, which has the characteristics of high magnetic resistance of the magnetic bridge and high mechanical strength of the rotor, and can run at high speed, thereby improving the torque density, power density and efficiency of the motor.

[0057] Example 3

[0058] This embodiment is an improvement on the basis of embodiment 2, and the improvement is: Fig. 9The rotor magnetic barrier 7 is an alloy strip, and is cut into U-shaped structures of different sizes during cutting. The arrangement of the multi-layer rotor magnetic barriers 7 is as follows: the length of the multi-layer rotor magnetic barriers 7 gradually decreases along the radial direction of the rotating shaft 3; wherein, a permanent magnet slot is opened in the middle position of the innermost rotor magnetic barrier 7, and a permanent magnet slot is opened near the end of the U-shaped rotor magnetic barrier 7 of the remaining layers, and the permanent magnets 4 are installed in the permanent magnet slots, so that except for the innermost rotor magnetic barrier 7, the permanent magnets 4 in the rotor magnetic barriers 7 on the other layers are arranged at intervals on the rotor magnetic barrier 7 of the current layer.

[0059] Example 4

[0060] A method for preparing a reluctance rotor structure based on a dual-phase material is the method for preparing a reluctance rotor structure based on a dual-phase material in Example 1, and the method comprises the following steps:

[0061] S1, cutting the high permeability core slice 8 and the rotor magnetic barrier 7 into the required shape;

[0062] S2. Arrange the cut high-permeability core slices 8 and rotor magnetic barriers 7 according to the connection sequence of the rotor magnetic barriers and high-permeability core slices in Example 1, and use argon arc, laser or electron beam to weld the high-permeability core slices 8 and rotor magnetic barriers 7 in the arrangement sequence to form rotor laminations 5. The multiple rotor laminations 5 extend in the axial direction and are stacked in sequence to form a reluctance rotor structure based on a dual-phase material.

[0063] There are many ways to connect the innermost high-permeability core slice 8 and the innermost rotor magnetic barrier 7, and between the remaining high-permeability core slices 8 and the remaining rotor magnetic barriers 7. In this embodiment, welding is preferred.

[0064] In this embodiment, if Fig.10 As shown, a method for preparing a reluctance rotor structure based on a dual-phase material comprises the following steps:

[0065] S1, the high-permeability core slice 8 is made of magnetic silicon steel strip, and the rotor magnetic barrier 7 is made of non-magnetic alloy strip. The high-permeability core slice 8 is cut into a desired shape, and the rotor magnetic barrier 7 is cut into rotor magnetic barrier slices 7 according to the desired shape;

[0066] S2. The high-permeability core slice 8 is placed in the middle position, the rotor magnetic barriers 7 are evenly arranged along the circumference of the high-permeability core slice 8, and multiple rotor magnetic barriers 7 are extended along the radial direction of the rotating shaft 3; a rotor magnetic barrier 7 is connected between two radially adjacent high-permeability core slices 8; the high-permeability core slice 8 and the rotor magnetic barrier 7 are welded to form a rotor lamination 5 of a dual-phase material, thereby forming a dual-phase material rotor core.

[0067] In another embodiment, if Fig.11As shown, a method for preparing a reluctance rotor structure based on a dual-phase material comprises the following steps:

[0068] S1, the high-permeability core slice 8 is made of magnetic silicon steel strip, and the rotor magnetic barrier 7 is made of non-magnetic alloy strip. The high-permeability core slice 8 is cut into a desired shape, and the rotor magnetic barrier 7 is cut into rotor magnetic barrier slices 7 according to the desired shape;

[0069] S2. The rotor magnetic barrier 7 is placed in the middle position, and the high-permeability core slices 8 are evenly arranged along the circumference of the rotor magnetic barrier 7, and a plurality of high-permeability core slices 8 are extended along the radial direction of the rotating shaft 3; a high-permeability core slice 8 is connected between two radially adjacent rotor magnetic barriers 7; the high-permeability core slices 8 and the rotor magnetic barrier 7 are welded to form a rotor lamination 5 of a dual-phase material, thereby forming a dual-phase material rotor core.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A reluctance rotor structure based on dual-phase material, characterized in that: include: Rotating shaft; The core comprises a plurality of rotor laminations, the plurality of rotor laminations extending along the axial direction of the rotating shaft and being stacked in sequence; each layer of the rotor laminations comprises a plurality of core slices, one of which is fixedly sleeved on the outer side of the rotating shaft, and the remaining core slices are spliced ​​in sequence along the radial direction of the rotating shaft and connected to the innermost core slice; Among them, the core slices include high-permeability core slices and low-permeability core slices; the high-permeability core slices and the low-permeability core slices are spliced ​​alternately in sequence and extend in sequence along the radial direction of the rotating shaft, and the low-permeability core slices serve as rotor magnetic barriers to form a reluctance rotor structure of a dual-phase material.

2. The reluctance rotor structure based on dual-phase material according to claim 1, characterized in that: A plurality of the rotor magnetic barriers and the high-permeability core slices which are staggered and spliced ​​in sequence are arranged along the circumference of the rotating shaft to form the reluctance rotor structure with one pair of poles or multiple pairs of poles.

3. The reluctance rotor structure based on dual-phase material according to claim 2, characterized in that: The shape of the rotor magnetic barrier is adapted to the shape of the high permeability core slice; the shape of the rotor magnetic barrier is symmetrical or asymmetrical "U-shaped", "V-shaped", "C-shaped" or a combination of multiple shapes.

4. The reluctance rotor structure based on dual-phase material according to claim 2, characterized in that: The ends of the high-permeability core slices and the ends of the rotor magnetic barriers are both arranged on the outer circumference of the reluctance rotor structure.

5. A method for preparing a reluctance rotor structure based on a dual-phase material, characterized in that: The method comprises the following steps: S1, cutting high permeability core slices and rotor magnetic barriers into required shapes; S2. Arrange the cut high-permeability core slices and rotor magnetic barriers according to the connection sequence of the rotor magnetic barriers and high-permeability core slices as described in any one of claims 1 to 4, and use argon arc, laser or electron beam to weld the high-permeability slices and rotor magnetic barriers in the arrangement sequence to form rotor laminations. Multiple rotor laminations extend in the axial direction and are stacked in sequence to form a reluctance rotor structure based on a dual-phase material.

6. A permanent magnet assisted synchronous reluctance rotor structure based on a dual-phase material, comprising a permanent magnet assisted synchronous reluctance rotor structure based on a dual-phase material, characterized in that: The reluctance rotor structure based on two-phase materials in the permanent magnet assisted synchronous reluctance rotor structure based on two-phase materials is the reluctance rotor structure based on two-phase materials as claimed in any one of claims 1 to 4.

7. The permanent magnet assisted synchronous reluctance rotor structure based on dual-phase material according to claim 6 is characterized in that: The rotor magnetic barrier is provided with a permanent magnet slot.

8. The permanent magnet assisted synchronous reluctance rotor structure based on dual-phase material according to claim 7, characterized in that: It also includes a permanent magnet; the permanent magnet is arranged in the permanent magnet slot.

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