ALA rotor of permanent magnet assisted synchronous reluctance motor

Abstract

The invention discloses an ALA rotor of a permanent magnet assisted synchronous reluctance motor, which is characterized in that the ALA rotor comprises two axial magnetic conduction shaft heads, a radial magnetic flux generation block, N ALA iron core blocks and N magnetic isolation blocks, the N ALA iron core blocks and the N magnetic isolation blocks are alternately arranged in the circumferential direction, and each ALA iron core block is independently attached to an alternating radial magnetic pole face on the radial magnetic flux generation block; at least two annular grooves in which radial fixing rings are embedded are formed in the peripheral faces of the ALA iron core blocks and the magnetic isolation blocks, the ALA iron core blocks, the magnetic isolation blocks and the radial magnetic flux generation blocks are pressed and fixed through the radial fixing rings to form an ALA rotor iron core module, and the two ends of the ALA rotor iron core module are each fixed to one axial magnetic conduction shaft head. Axial magnetic flux magnetic steel is fixedly arranged between at least one end of each ALA iron core block and the axial magnetic conductive shaft head; the motor has the advantages of stable structure and high salient pole rate and torque density.

Description

Technical Field

[0001] The present invention relates to a motor rotor, in particular to an ALA rotor of a permanent magnet assisted synchronous reluctance motor. Background Art

[0002] The permanent magnet-assisted synchronous reluctance motor (SRM) is a type of motor being developed as future permanent magnet motors move toward rare earth-free or low-reduced use. It utilizes reluctance torque and the permanent magnetic torque provided by permanent magnets to ensure high power density, a high power factor, and meet cost reduction requirements. Among SRMs, those with axially laminated anisotropic (ALA) rotors exhibit higher saliency, torque, and power density than those with transversely laminated rotors.

[0003] The punching sheets of the multi-pole ALA rotor are made by bending and laminating. The manufacturing process of the ALA rotor core is complex, the material utilization rate is low, and it is not convenient for modular design, which is not conducive to mass production of the product. The existing multi-pole ALA rotor adopts the bending and laminating method, and the rotor strength is low, which is not conducive to the high-speed operation of the ALA reluctance motor. This limits the operating ability of the motor and equipment under high-speed constant power conditions and has relatively limited application scenarios. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an ALA rotor of a permanent magnet assisted synchronous reluctance motor with a stable structure, high saliency ratio and torque density.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: an ALA rotor of a permanent magnet assisted synchronous reluctance motor, comprising two axial magnetic conductive shaft heads, a radial magnetic flux generating block, N ALA core blocks and N magnetic isolation blocks, wherein the ALA core blocks are formed by alternately stacking straight magnetic conductive sheets and straight non-magnetic conductive sheets, N being the number of poles of the ALA rotor, and N / 2 pairs of symmetrically distributed alternating radial magnetic pole faces are evenly arranged circumferentially on the radial magnetic flux generating block, and the radial outer polarities of two adjacent alternating radial magnetic pole faces are opposite, and each of the ALA core blocks is individually arranged against one of the alternating radial magnetic pole faces, and the N ALA core blocks and the N magnetic isolation blocks are circumferentially alternately arranged, and the ALA core blocks are arranged circumferentially. The outer peripheral surface of the block and the outer peripheral surface of the magnetic isolation block jointly form a cylindrical surface, and the cylindrical surface is provided with at least two annular grooves arranged at intervals along the axial direction, and a radial fixing ring is embedded in the annular groove. The radial fixing ring presses and fixes the ALA core block, the magnetic isolation block and the radial magnetic flux generating block to form an ALA rotor core module. The two ends of the ALA rotor core module are respectively fixedly connected to one of the axial magnetic guide shaft heads, and an axial magnetic flux magnetic steel is fixedly provided between at least one end of each ALA core block and the axial magnetic guide shaft head. The polarity of the axial outer end of the axial magnetic flux magnetic steel is opposite to the outer polarity of the alternating radial magnetic pole surface on the inner side of the corresponding ALA core block.

[0006] Compared with the prior art, the advantages of the present invention are: (1) Axial flux magnetic steel is arranged between at least one end of the ALA core block and the axial magnetic guide shaft head to form an axial magnetic circuit. Generally, axial flux magnetic steel is arranged at both ends, and then a radial magnetic field is generated by a radial flux generating block, which together with the axial magnetic circuit constitutes a 3D space magnetic circuit, which plays a maximum magnetic concentration role, fully improves the reluctance torque and permanent magnet torque of the permanent magnet assisted synchronous reluctance motor, and thus improves the power density and torque density of the permanent magnet assisted synchronous reluctance motor; (2) The ALA rotor core module is fixed by the radial fixing ring and the axial magnetic guide shaft head to form a high-strength integral structure, which is suitable for high-speed / high-torque motors and has a wider range of applications; (3) Due to the setting of the radial flux generating block and the axial flux magnetic steel, the ALA core block can be directly formed by interleaving straight magnetic conductive sheets and non-magnetic conductive sheets without bending. Therefore, the strip material can be fully utilized, the material utilization rate is improved, the manufacturing process is simple and convenient, and it is easy to modularize mass production and save costs.

[0007] Preferably, the cylindrical surface is provided with four annular grooves spaced axially, with two of the annular grooves being provided on the circumferential sides of the two ends of the cylindrical surface, respectively. This enhances the structural stability of the ends of the ALA rotor core module, thereby ensuring a better connection and fixation with the axially directed magnetic guide shaft head.

[0008] Preferably, when N=2, the radial magnetic flux generating block is a first radial magnetic flux magnetic steel block fixedly clamped between the two ALA core blocks and the two magnetic isolation blocks, the radial inner side of the magnetic isolation block forms a first connecting plane, the radial outer side of the first radial magnetic flux magnetic steel block is aligned with the radial outer side of the ALA core block and forms a second connecting plane that is in contact with the first connecting plane, the outer side of the axial magnetic guide shaft head is provided with a third connecting plane that is in contact with the first connecting plane, and the end of the magnetic isolation block is fixedly connected to the axial magnetic guide shaft head by at least two connecting bolts. Since only two alternating radial magnetic pole faces with opposite polarity are needed at this time, only a whole first radial flux magnetic steel block itself is needed as a radial flux generating block. Correspondingly, its fixing method adopts a clip-type connection. The two magnetic isolation blocks are equivalent to two fixing clips that clamp the first radial flux magnetic steel block in the middle. The end of the magnetic isolation block is fitted with the third connecting plane set on the outside of the axial guide shaft head through the first connecting plane, and the fixed connection is achieved by connecting bolts. Finally, the ALA core block, the magnetic isolation block and the first radial flux magnetic steel block are pressed and fixed by a radial fixing ring to form an ALA rotor core module. The structure is simple and the installation process is relatively fast and convenient.

[0009] Preferably, the ends of the ALA core blocks are radially contracted inward to form a semicircular connector, and the two semicircular connectors are relatively closed to form a first cylindrical connector. The axial magnetic guide shaft head is provided with a first fixing cavity for accommodating and fixing the first cylindrical connector and is fixedly sleeved on the first cylindrical connector. The axial flux magnetic steel has a semi-arc structure and the two pieces of axial flux magnetic steel located at the same end are symmetrically arranged. The axial magnetic guide shaft head is located on the circumferential side plane of the axial inner end opening of the fixed cavity and is recessed with an annular first axial magnetic steel installation cavity. The axial flux magnetic steel is fixedly arranged in the first axial magnetic steel installation cavity and pressed between the axial magnetic guide shaft head and the platform surface on the outer circumference of the semicircular connector on the ALA core block of the same polarity. The axial magnetic guide shaft head passes through the first fixed cavity and is fixedly sleeved on the first cylindrical connector, which enhances the connection stability between the ALA core block and the axial magnetic guide shaft head during actual operation and facilitates positioning during installation, ensuring the coaxiality of the overall structure. The axial flux magnetic steel is arranged between the end of the ALA core block of the same polarity and the axial magnetic guide shaft head to form an axial magnetic circuit, thereby improving the salient pole ratio and torque density. The two pieces of axial flux magnetic steel have a semi-arc structure and are symmetrically arranged, forming a full-circular structure embedded in the annular first axial magnetic steel installation cavity, effectively improving the balance of the magnetic circuit.

[0010] Preferably, a first limit key is axially disposed on the outer side of the semicircular connector, and the first limit keys on the two semicircular connectors are symmetrical with each other. Two first limit slots corresponding to the first limit keys are symmetrically and axially recessed on the inner wall of the first fixing cavity, and the first limit keys are fixedly embedded in the first limit slots. The keyway mechanism limits relative rotation between the ALA core block and the axial magnetic guide shaft head, ensuring that the entire structure maintains synchronous high-speed rotation during operation.

[0011] Preferably, when N≥4, the radial magnetic flux generating block includes a magnetic core shaft and N second radial magnetic flux magnetic steel blocks with a trapezoidal structure, the middle portion of the magnetic core shaft is uniformly contracted radially inward compared to the end side surface to form an annular mounting portion with N circumferentially uniformly distributed magnetic steel mounting planes, each of the second radial magnetic flux magnetic steel blocks is abutted against one of the magnetic steel mounting planes, the end circumferential side surfaces of the magnetic core shaft are provided with N end circumferential side surfaces that are flush with the outer side surfaces of the second radial magnetic flux magnetic steel blocks, the inner side of each ALA core block is abutted one-to-one against the outer side of one of the second radial magnetic flux magnetic steel blocks and the end circumferential side surface of the magnetic core shaft, and the magnetic isolation block is an arc-shaped structure and is clamped on the outer side of the gap formed between two adjacent ALA core blocks; The end of the ALA core block is radially contracted inward to form a flat connector with an arc surface on the outside and a flat surface on the inside. The flat connector is abutted against the circumferential side surface of the end of the magnetic core shaft. N flat connectors and the end of the magnetic core shaft together form a second cylindrical connector. The interior of the axial magnetic shaft head is provided with a second fixing cavity for accommodating and fixing the second cylindrical connector and is fixedly sleeved on the second cylindrical connector. The axial magnetic guide shaft head is located on the outer peripheral surface of the inner end opening of the second fixed cavity to form a fixed table, and a second axial magnetic steel installation cavity is recessed on the fixed table. The axial magnetic flux magnetic steel is fixedly arranged in the second axial magnetic steel installation cavity and is pressed between the axial magnetic guide shaft head and the platform surface on the outer peripheral side of the flat connector on the ALA iron core block. The axial inner end of the axial magnetic flux magnetic steel is flush with the axial inner end of the axial magnetic guide shaft head.

[0012] In the above structure, the magnetic steel installation planes in different directions are constructed by the magnetic core shaft. The second radial flux magnetic steel block only needs to be made into a trapezoidal or rectangular structure with flat two sides to be directly installed and fixed, without the need to make a curved structure, which is convenient for processing and manufacturing; after the radial flux magnetic steel block is installed, the ALA iron core block and the magnetic isolation block with a specific structure are installed separately and then fixed as a whole through radial fixation. The method of using multiple components to piece together the whole body makes it easier to process each component, and the installation process is simpler and more convenient, which can provide a uniform radial magnetic field; N flat connectors and the end of the magnetic core shaft together form a second cylindrical connector, and the axial magnetic shaft head is fixedly sleeved on the second cylindrical connector through the second fixed cavity. The structural design is more ingenious and has stronger fixation after being connected to each other; the axial flux magnetic steel is placed in the second axial magnetic steel installation cavity with the same depth as the thickness of the axial flux magnetic steel, which can not only ensure stable placement without shaking, but also effectively protect the axial flux magnetic steel itself from being subjected to greater pressure.

[0013] Preferably, first connecting pin holes are symmetrically provided on the two oppositely arranged flat connectors, second connecting pin holes aligned with the two first connecting pin holes are provided through the ends of the magnetic conductive core shaft, two third connecting pin holes aligned with the first connecting pin holes and the second connecting pin holes are symmetrically provided on both sides of the axial magnetic conductive shaft head, the first connecting pin holes, the second connecting pin holes and the third connecting pin holes together form a pin hole connection channel, and a connecting rivet is provided through the pin hole connection channel to connect and fix the axial magnetic conductive shaft head, the flat connector and the magnetic conductive core shaft. Only one connecting rivet is needed to achieve a firm connection between the ALA rotor core module and the axial magnetic conductive shaft head, which has a simple structure, is relatively convenient in processing and installation, and has good connection stability.

[0014] Preferably, the axial flux magnets and the second axial magnet mounting cavity are both arc-shaped structures with matching shapes. Each axial flux magnet and the second axial magnet mounting cavity are both arc-shaped structures, forming a circular structure as a whole, which has better magnetic circuit balance during operation.

[0015] Preferably, at least one weight-reducing through hole is provided axially through the interior of the magnetic isolation block. The weight-reducing through hole provided inside the magnetic isolation block can reduce the weight of the magnetic isolation block, thereby reducing the overall inertia of the ALA rotor and improving the dynamic response. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural exploded view and partial structural cross-sectional view of Example 1 of the present invention; Figure 2 This is a partial structural diagram of Example 1 of the present invention; Figure 3 This is a schematic structural diagram of the axial magnetic guide shaft head according to the first embodiment of the present invention; Figure 4 This is a cross-sectional view of the overall structure of the ALA rotor and the external stator after assembly in Example 1 of the present invention; Figure 5 Schematic diagram of the magnetic circuit of the ALA rotor and the external stator in the first embodiment of the present invention in the state of use after assembly; Figure 6 A simulation diagram of the relationship between torque and time of a conventional permanent magnet assisted synchronous reluctance motor using a two-pole ALA rotor; Figure 7 This is a simulation diagram of the relationship between torque and time of a permanent magnet assisted synchronous reluctance motor using an ALA rotor according to the first embodiment of the present invention; Figure 8 This is a structural exploded view and partial structural cross-sectional view of Example 2 of the present invention; Figure 9 This is a schematic structural diagram of the axial magnetic guide shaft head in the second embodiment of the present invention; Figure 10 This is a schematic structural diagram of the magnetic core shaft in the second embodiment of the present invention; Figure 11 Schematic diagram of the structure of the ALA core block in Example 2 of the present invention; Figure 12 Schematic diagram of the structure of the magnetic separation block in Example 2 of the present invention; Figure 13 This is a partial structural diagram of Example 2 of the present invention.

[0017] Description of reference numerals: 1. Axial guide magnetic shaft head; 11. Third connection plane; 12. First fixing cavity; 13. First axial magnetic steel installation cavity; 14. First limiting groove; 15. Second fixing cavity; 16. Fixed table; 17. Second axial magnetic steel installation cavity; 18. Third connection pin hole; 19. Connection rivet 21. Alternating radial magnetic pole surface; 22. First radial magnetic flux magnetic steel block; 23. Magnetic core shaft; 231. Magnetic steel mounting plane; 232. Annular mounting portion; 233. End peripheral side surface; 234. Second connecting pin hole; 24. Second radial magnetic flux magnetic steel block; 3. ALA core block; 31. Second connecting plane; 32. Semicircular connector; 33. First cylindrical connector; 34. Platform surface; 35. First limit key; 36. Flat connector; 361. First connecting pin hole; 37. Second cylindrical connector; 4. Magnetic isolation block; 41. First connection plane; 42. Weight reduction through hole; 5. Cylindrical surface; 51. Annular groove; 6. Radial fixing ring; 7. ALA rotor core module; 8. Axial flux magnetic steel. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below with reference to the embodiments of the accompanying drawings. It should be noted that the axial outer end refers to the end portion of each structure axially away from the axial middle portion of the ALA core block 3, and the axial inner end refers to the end portion of each structure axially facing the axial middle portion of the ALA core block 3.

[0019] Example 1: Figures 1 to 5 As shown, an ALA rotor of a permanent magnet assisted synchronous reluctance motor comprises two axially conductive magnetic shaft heads 1, a radial flux generating block, N ALA core blocks 3 and N magnetic isolation blocks 4. The ALA core blocks 3 are formed by alternately stacking straight magnetic conductive sheets and straight non-magnetic conductive sheets. N is the number of poles of the ALA rotor. N / 2 pairs of symmetrically distributed alternating radial magnetic pole faces 21 are uniformly arranged circumferentially on the radial flux generating block. The radial outer polarities of two adjacent alternating radial magnetic pole faces 21 are opposite. Each ALA core block 3 is individually abutted against an alternating radial magnetic pole face 21. The N ALA core blocks 3 and the N magnetic isolation blocks 4 are alternately arranged circumferentially. The outer peripheral surfaces of the ALA core blocks 3 and the outer peripheral surfaces of the magnetic isolation blocks 4 are in common. A cylindrical surface 5 is formed, and four annular grooves 51 are arranged on the cylindrical surface 5 at intervals along the axial direction, wherein two annular grooves 51 are respectively arranged on the circumferential sides of the two ends of the cylindrical surface 5, and a radial fixing ring 6 is embedded in the annular groove 51. The radial fixing ring 6 presses and fixes the ALA core block 3, the magnetic isolation block 4 and the radial magnetic flux generating block to form an ALA rotor core module 7. The two ends of the ALA rotor core module 7 are respectively fixedly connected to an axial magnetic guide shaft head 1, and an axial magnetic flux magnet 8 is fixedly arranged between at least one end of each ALA core block 3 and the axial magnetic guide shaft head 1. The polarity of the axial outer end of the axial magnetic flux magnet 8 is opposite to the outer polarity of the alternating radial magnetic pole surface 21 on the inner side of the ALA core block 3 at the corresponding position.

[0020] In this first embodiment, N=2. The radial flux generating block is a first radial flux magnetic steel block 22 fixedly clamped between two ALA core blocks 3 and two magnetic isolation blocks 4. The radial inner side of the magnetic isolation block 4 forms a first connection plane 41. The radial outer side of the first radial flux magnetic steel block 22 is aligned with the radial outer side of the ALA core block 3 and forms a second connection plane 31 that mates with the first connection plane 41. A third connection plane 11 is provided on the outer side of the axial magnetic guide shaft head 1, which mates with the first connection plane 41. The end of the magnetic isolation block 4 is fixedly connected to the axial magnetic guide shaft head 1 by at least two connecting bolts. The first radial flux magnetic steel block 22 is located between the two ALA core blocks 3 and the two magnetic isolation blocks 4, enhancing the radial magnetic field and improving the torque density.

[0021] The ends of the ALA core blocks 3 are radially contracted inward to form a semicircular connector 32. The two semicircular connectors 32 are relatively closed to form a first cylindrical connector 33. The interior of the axial magnetic guide shaft head 1 is provided with a first fixing cavity 12 for accommodating and fixing the first cylindrical connector 33 and fixedly sleeved on the first cylindrical connector 33. The number of annular grooves 51 is at least two, and four are used here. Two of the annular grooves 51 are located at both ends, so that the radial fixing rings 6 located therein tighten the ends of the cylindrical surface 5, improving the connection firmness while facilitating the installation and fixation between the first cylindrical connector 33 and the first fixing cavity 12 of the axial magnetic guide shaft head 1.

[0022] The axial flux magnetic steel 8 has a semi-arc structure, and two axial flux magnetic steels 8 are symmetrically arranged at the same end. The axial guide magnetic shaft head 1 is located on the circumferential side plane of the axial inner end opening of the first fixed cavity 12, and an annular first axial magnetic steel installation cavity 13 is recessed. The axial flux magnetic steel 8 is fixedly arranged in the first axial magnetic steel installation cavity 13 and is pressed between the axial guide magnetic shaft head 1 and the platform surface 34 on the outer circumference of the semicircular connector 32 on the ALA core block 3 of the same polarity. The axial flux magnetic steel 8 is arranged between the end of the ALA core block 3 and the axial guide magnetic shaft head 1 to form an axial magnetic circuit, thereby improving the saliency and torque density. It is preferred that two axial flux magnetic steels 8 are symmetrically arranged at both ends of the ALA core block 3 to achieve better magnetic circuit balance.

[0023] A first limit key 35 is axially arranged on the outer side of the semicircular connector 32, and the first limit keys 35 on the two semicircular connectors 32 are symmetrical with each other. Two first limit grooves 14 corresponding to the first limit key 35 are symmetrically and axially recessed on the inner wall of the first fixed cavity 12, and the first limit key 35 is fixedly embedded in the first limit groove 14.

[0024] Figure 6 、 Figure 7 In the figure, the y-axis represents torque and the x-axis represents time. Figure 6 、 Figure 7Comparison shows that the torque density and power density of the structure of the first embodiment are both increased by 45.8% compared with the conventional permanent magnet assisted synchronous reluctance motor using a two-pole ALA rotor. In addition, Figure 6 、 Figure 7 The magnetic field cloud diagrams of the corresponding ALA rotors were simulated and compared. From the comparison results, it can be seen that compared with the existing permanent magnet assisted synchronous reluctance motor using a two-pole ALA rotor, the permanent magnet assisted synchronous reluctance motor using the ALA rotor of the first embodiment has an effective permanent magnet magnetic field. Therefore, it can be proved that the structure of the first embodiment fully utilizes the permanent magnet magnetic field compared with the existing structure, thereby greatly improving the power density and torque density of the motor.

[0025] Example 2: Figures 8 to 13 As shown, the rest of the parts are the same as those in the first embodiment, except that when N ≥ 4, specifically, taking N = 6 as an example, the radial flux generating block includes a magnetic core shaft 23 and N second radial flux magnetic steel blocks 24 with a trapezoidal structure. The middle portion of the magnetic core shaft 23 is uniformly contracted radially inward compared to the end side to form an annular mounting portion 232 with N circumferentially uniformly distributed magnetic steel mounting planes 231. Each second radial flux magnetic steel block 24 is abutted against a magnetic steel mounting plane 231. N end circumferential sides are provided on the end circumferential side, which are flush with the outer side of the second radial flux magnetic steel block 24. The inner side of each ALA core block 3 is one-to-one abutted against the outer side of the end circumferential side 233 of a second radial flux magnetic steel block 24 and the magnetic core shaft 23. The magnetic isolation block 4 is an arc-shaped structure and is clamped on the outer side of the gap formed between the two adjacent ALA core blocks 3. When there are multiple poles, a second radial flux magnetic steel block 24 with a trapezoidal structure or a rectangular structure is used, which is easy to manufacture and provides a uniform radial magnetic field.

[0026] The end of the ALA core block 3 contracts radially inward to form a flat connector 36 with an arc surface on the outside and a flat surface on the inside. The flat connector 36 is abutted against the end circumferential side surface 233 of the magnetic core shaft 23. N flat connectors 36 and the end of the magnetic core shaft 23 together form a second cylindrical connector 37. A second fixing cavity 15 for accommodating and fixing the second cylindrical connector 37 is provided inside the axial magnetic shaft head 1 and is fixedly sleeved on the second cylindrical connector 37.

[0027] The axial guide magnetic shaft head 1 is located on the outer peripheral surface of the inner end opening of the second fixed cavity 15 to form a fixed table 16, and a second axial magnetic steel mounting cavity 17 is recessed on the fixed table 16. The axial magnetic flux magnetic steel 8 is fixedly arranged in the second axial magnetic steel mounting cavity 17 and is tightly arranged between the axial guide magnetic shaft head 1 and the platform surface 34 on the outer peripheral side of the flat connector 36 on the ALA core block 3. The axial inner end of the axial magnetic flux magnetic steel 8 is flush with the axial inner end of the axial guide magnetic shaft head 1, and the axial magnetic flux magnetic steel 8 and the second axial magnetic steel mounting cavity 17 are both arc structures with matching shapes.

[0028] Two relatively arranged flat connectors 36 are symmetrically provided with first connecting pin holes 361, and the end of the magnetic core shaft 23 is penetrated by a second connecting pin hole 234 aligned with the two first connecting pin holes 361. Two third connecting pin holes 18 aligned with the first connecting pin hole 361 and the second connecting pin hole 234 are symmetrically provided on both sides of the axial magnetic shaft head 1. The first connecting pin hole 361, the second connecting pin hole 234 and the third connecting pin hole 18 together form a pin hole connection channel, and a connecting rivet 19 is penetrated in the pin hole connection channel to connect and fix the axial magnetic shaft head 1, the flat connector 36 and the magnetic core shaft 23.

[0029] Two weight-reducing through holes 42 are provided in the axial direction inside the magnetic isolation block 4. The number of the weight-reducing through holes 42 can be one or more than three according to actual needs.

[0030] The manufacturing methods of the components in the above embodiment 2 are as follows: The P1 and ALA rotor core modules 7 are formed by stamping or die-forming magnetic silicon steel sheets and magnetic isolation sheets, and are laminated alternately with the magnetic isolation sheets. The magnetic isolation sheets can be made of metals such as copper and aluminum, or non-metallic materials such as carbon fiber. The lamination methods include riveting, dovetail groove connection, etc. P2, the magnetic core shaft 23 is forged and formed into a regular polygon according to the number of poles. The middle part of the magnetic core shaft 23 is formed with an annular mounting portion 232 with a magnetic steel mounting plane 231. The protruding parts at both ends are assembled with the ALA core block 3 and then inserted into the axial magnetic shaft head 1. Second connecting pin holes 234 are formed through both ends of the magnetic core shaft 23; P3, the magnetic isolation block 4 is formed by aluminum die casting, and an annular groove 51 is formed by lathe processing. The axial magnetic guide shaft head 1 is milled to form the second axial magnetic steel installation cavity 17 and the second limiting groove 151, and the third connecting pin hole 18 is drilled; P4 and radial fixing ring 6 are made of carbon fiber heat-shrink sleeve or on-site winding.

[0031] The assembly process of the above embodiment 2 is as follows: S1, attaching the second radial flux magnetic steel block 24 to the magnetic steel mounting plane 231 of the magnetic core shaft 23; S2. Install the ALA core block 3 to the outside of the second radial flux magnetic steel block 24 and align it with the end of the magnetic core shaft 23; S3, install the axial flux magnetic steel 8 into the second axial magnetic steel installation cavity 17, and insert the axial guide magnetic shaft head 1; S4, inserting the connecting rivet 19 into the pin hole connecting channel; S5. Install the magnetic isolation block 4 to the gap between the ALA core block 3 and wind the radial fixing ring 6; S6. Turning / grinding the outer diameter of the ALA rotor to optimize dynamic balance.

Claims

1. An ALA rotor of a permanent magnet assisted synchronous reluctance motor, characterized in that It includes two axial magnetic conductive shaft heads, radial magnetic flux generating blocks, N ALA core blocks and N magnetic isolation blocks. The ALA core blocks are formed by alternately stacking straight magnetic conductive sheets and straight non-magnetic conductive sheets. N is the number of poles of the ALA rotor. The radial magnetic flux generating blocks are circumferentially evenly provided with N / 2 pairs of symmetrically distributed alternating radial magnetic pole faces. The outer polarities of two adjacent alternating radial magnetic pole faces are opposite. Each ALA core block is individually placed against one of the alternating radial magnetic pole faces. The N ALA core blocks and the N magnetic isolation blocks are circumferentially alternately arranged. The outer peripheral surface of the ALA core block and the outer peripheral surface of the magnetic isolation block together form a circle. The cylindrical surface is provided with at least two annular grooves arranged at intervals along the axial direction, and a radial fixing ring is embedded in the annular groove. The radial fixing ring presses and fixes the ALA core block, the magnetic isolation block and the radial magnetic flux generating block to form an ALA rotor core module. The two ends of the ALA rotor core module are respectively fixedly connected to one of the axial magnetic guide shaft heads. An axial magnetic flux magnetic steel is fixedly provided between at least one end of each ALA core block and the axial magnetic guide shaft head. The polarity of the axial outer end of the axial magnetic flux magnetic steel is opposite to the outer polarity of the alternating radial magnetic pole surface on the inner side of the corresponding ALA core block.

2. The ALA rotor of a permanent magnet assisted synchronous reluctance motor according to claim 1, characterized in that The cylindrical surface is provided with four annular grooves arranged at intervals along the axial direction, wherein two of the annular grooves are respectively provided on the circumferential sides of the two ends of the cylindrical surface.

3. The ALA rotor of a permanent magnet assisted synchronous reluctance motor according to claim 1, characterized in that When N=2, the radial flux generating block is a first radial flux magnetic steel block fixedly clamped between the two ALA core blocks and the two magnetic isolation blocks, the radial inner side of the magnetic isolation block forms a first connecting plane, the radial outer side of the first radial flux magnetic steel block is aligned with the radial outer side of the ALA core block and forms a second connecting plane that is in contact with the first connecting plane, the outer side of the axial magnetic guide shaft head is provided with a third connecting plane that is in contact with the first connecting plane, and the end of the magnetic isolation block is fixedly connected to the axial magnetic guide shaft head by at least two connecting bolts.

4. The ALA rotor of a permanent magnet assisted synchronous reluctance motor according to claim 3, characterized in that The ends of the ALA core blocks are radially contracted inward to form a semicircular connector, and the two semicircular connectors are relatively closed to form a first cylindrical connector. The interior of the axial magnetic guide shaft head is provided with a first fixing cavity for accommodating and fixing the first cylindrical connector and is fixedly sleeved on the first cylindrical connector; The axial flux magnetic steel is a semi-arc structure and the two axial flux magnetic steels located at the same end are symmetrically arranged. The axial magnetic guide shaft head is located on the circumferential side plane of the axial inner end opening of the fixed cavity and is recessed with a ring-shaped first axial magnetic steel mounting cavity. The axial flux magnetic steel is fixed in the first axial magnetic steel mounting cavity and is pressed between the axial magnetic guide shaft head and the platform surface on the outer circumferential side of the semicircular connector on the ALA core block of the same polarity.

5. The ALA rotor of a permanent magnet assisted synchronous reluctance motor according to claim 4, characterized in that A first limit key is axially arranged on the outer side of the semicircular connector, and the first limit keys on the two semicircular connectors are symmetrical to each other. Two first limit grooves corresponding to the first limit keys are symmetrically and axially recessed on the inner wall of the first fixed cavity, and the first limit key is fixedly embedded in the first limit groove.

6. The ALA rotor of a permanent magnet assisted synchronous reluctance motor according to claim 1, characterized in that When N≥4, the radial magnetic flux generating block includes a magnetic core shaft and N second radial magnetic flux magnetic steel blocks with a trapezoidal structure. The middle part of the magnetic core shaft is uniformly contracted radially inward compared to the end side surface to form an annular mounting portion with N circumferentially uniformly distributed magnetic steel mounting planes. Each of the second radial magnetic flux magnetic steel blocks is abutted against one of the magnetic steel mounting planes. The end circumferential side surfaces of the magnetic core shaft are provided with N end circumferential side surfaces that are flush with the outer side surfaces of the second radial magnetic flux magnetic steel blocks. The inner side of each ALA core block is abutted one-to-one against the outer side surfaces of a second radial magnetic flux magnetic steel block and the end circumferential side surface of the magnetic core shaft. The magnetic isolation block is an arc-shaped structure and is clamped on the outer side of the gap formed between two adjacent ALA core blocks. The end of the ALA core block is radially contracted inward to form a flat connector with an arc surface on the outside and a flat surface on the inside. The flat connector is abutted against the circumferential side surface of the end of the magnetic core shaft. N flat connectors and the end of the magnetic core shaft together form a second cylindrical connector. The interior of the axial magnetic shaft head is provided with a second fixing cavity for accommodating and fixing the second cylindrical connector and is fixedly sleeved on the second cylindrical connector. The axial magnetic guide shaft head is located on the outer peripheral surface of the inner end opening of the second fixed cavity to form a fixed table, and a second axial magnetic steel installation cavity is recessed on the fixed table. The axial magnetic flux magnetic steel is fixedly arranged in the second axial magnetic steel installation cavity and is pressed between the axial magnetic guide shaft head and the platform surface on the outer peripheral side of the flat connector on the ALA iron core block. The axial inner end of the axial magnetic flux magnetic steel is flush with the axial inner end of the axial magnetic guide shaft head.

7. The ALA rotor of a permanent magnet assisted synchronous reluctance motor according to claim 6, characterized in that The two relatively arranged flat connectors are symmetrically provided with first connecting pin holes, the ends of the magnetic core shaft are penetrated with second connecting pin holes aligned with the two first connecting pin holes, and two third connecting pin holes are symmetrically provided on both sides of the axial magnetic shaft head and are aligned with the first connecting pin holes and the second connecting pin holes. The first connecting pin hole, the second connecting pin hole and the third connecting pin hole together form a pin hole connection channel, and a connecting rivet is penetrated in the pin hole connection channel to connect and fix the axial magnetic shaft head, the flat connector and the magnetic core shaft.

8. The ALA rotor of a permanent magnet assisted synchronous reluctance motor according to claim 6, characterized in that The axial flux magnetic steel and the second axial magnetic steel installation cavity are both arc-shaped structures with matching shapes.

9. The ALA rotor of a permanent magnet assisted synchronous reluctance motor according to claim 6, characterized in that At least one weight-reducing through hole is axially provided inside the magnetic isolation block.

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