Ala rotor of a permanent magnet assisted synchronous reluctance machine

Abstract

The application discloses an ALA rotor of a permanent magnet auxiliary synchronous reluctance motor, and is characterized in that the ALA rotor comprises two axial magnetism-guiding shaft heads, a radial magnetic flux generating block, N ALA iron core blocks and magnetic isolation blocks which are arranged in a circumferential direction alternately, each ALA iron core block is separately arranged on an alternating radial magnetic pole surface of the radial magnetic flux generating block, and the outer circumferential surfaces of the ALA iron core blocks and the magnetic isolation blocks are provided with at least two annular grooves in which radial fixing rings are embedded, the radial fixing rings are used for pressing and fixing the ALA iron core blocks, the magnetic isolation blocks and the radial magnetic flux generating block to form an ALA rotor iron core module, and the two ends of the ALA rotor iron core module are fixed with the axial magnetism-guiding shaft heads respectively, and axial magnetic flux magnetic steels are fixed between at least one end of each ALA iron core block and the axial magnetism-guiding shaft head; and the ALA rotor has the advantages of stable structure, high saliency ratio and high torque density.

Description

TECHNICAL FIELD

[0001] The application relates to an electric machine rotor, in particular to an ALA rotor of a permanent magnet assisted synchronous reluctance machine. BACKGROUND

[0002] The permanent magnet assisted synchronous reluctance machine is developed under the background of the development of future permanent magnet machines toward non-rare earth and less rare earth. The machine utilizes reluctance torque and permanent magnet torque provided by a permanent magnet to ensure that the machine has high power density, high power factor and low cost. In the permanent magnet assisted synchronous reluctance machine, the ALA reluctance machine with an axially-laminated anisotropic (ALA) rotor has higher saliency ratio, torque and power density than the reluctance machine with a transversely-laminated rotor.

[0003] The lamination of the multi-pole ALA rotor is bent and laminated. The manufacturing process of the ALA rotor is complex, the material utilization rate is low and the modular design is not convenient, which is not conducive to mass production of the product. The existing multi-pole ALA rotor has low strength due to the bending and laminating mode, which is not conducive to high-speed operation of the ALA reluctance machine, limits the operation ability of the machine and equipment in the high-speed constant power working condition, and the application occasions are limited. SUMMARY

[0004] The application aims to provide an ALA rotor of a permanent magnet assisted synchronous reluctance machine with stable structure, high saliency ratio and high torque density.

[0005] The application solves the above technical problems by adopting the technical scheme of an ALA rotor of a permanent magnet assisted synchronous reluctance motor, comprising two axial magnetic conduction shaft heads, a radial magnetic flux generating block, N ALA core blocks and N magnetic isolation blocks, the ALA core block is formed by interlaced and laminated molding of flat magnetic conductive laminations and flat non-magnetic conductive laminations, N is the pole number of the ALA rotor, the radial magnetic flux generating block is uniformly provided with N / 2 pairs of symmetrically distributed alternating radial magnetic pole surfaces, the polarities of the radial outer sides of two adjacent alternating radial magnetic pole surfaces are opposite, each ALA core block is separately arranged on one alternating radial magnetic pole surface, the N ALA core blocks and the N magnetic isolation blocks are circumferentially alternately arranged, the outer circumferential surface of the ALA core block and the outer circumferential surface of the magnetic isolation block jointly form a cylindrical surface, the cylindrical surface is provided with at least two annular grooves arranged in an axial direction, the annular grooves are embedded with radial fixing rings, the radial fixing rings press and fix the ALA core blocks, the magnetic isolation blocks and the radial magnetic flux generating block to form an ALA rotor core module, the two ends of the ALA rotor core module are fixedly connected with one axial magnetic conduction shaft head respectively, and an axial magnetic flux magnetic steel is fixedly arranged between at least one end of each ALA core block and the axial magnetic conduction shaft head, the polarity of the axial outer end of the axial magnetic flux magnetic steel is opposite to the polarity of the outer side of the alternating radial magnetic pole surface on the inner side of the corresponding ALA core block.

[0006] Compared with the prior art, the application has the following advantages:

[0007] (1) The axial magnetic flux magnetic steel is arranged between at least one end of the ALA core block and the axial magnetic conduction shaft head to form an axial magnetic circuit, axial magnetic flux magnetic steels are arranged at both ends, a radial magnetic field is generated through the radial magnetic flux generating block, and the axial magnetic circuit and the radial magnetic field jointly form a 3D space magnetic circuit, which has a maximum magnetic gathering effect, sufficiently improves the reluctance torque and the permanent magnet torque of the permanent magnet assisted synchronous reluctance motor, and further improves the power density and the torque density of the permanent magnet assisted synchronous reluctance motor.

[0008] (2) The ALA rotor core module is press-fixed by the radial fixing ring and the axial magnetic conduction shaft head to form a high-strength overall structure, which is suitable for high-speed / high-torque motors and has a wider application range.

[0009] (3) Due to the arrangement of the radial magnetic flux generating block and the axial magnetic flux magnetic steel, the ALA core block can be directly interlaced and laminated molded by flat magnetic conductive laminations and flat non-magnetic conductive laminations without bending, so that the strip material can be fully utilized, the material utilization rate is improved, the manufacturing process is simple and convenient, mass production is facilitated, and costs are saved.

[0010] Preferably, the cylindrical surface is provided with four annular grooves arranged in axial direction, two of which are arranged on the circumferential side of the two ends of the cylindrical surface respectively. The structural stability of the end of the ALA rotor core module is enhanced, thereby ensuring better connection and fixation with the axial magnetically conductive shaft head.

[0011] Preferably, when N=2, the radial magnetic flux generating block is a first radial magnetic flux magnet block fixedly clamped between two ALA core blocks and two magnetic shielding blocks, the radial inner side of the magnetic shielding block forms a first connecting plane, the radial outer side of the first radial magnetic flux magnet block is aligned with the radial outer side of the ALA core block and forms a second connecting plane which is in close contact with the first connecting plane, the outer side of the axial magnetically conductive shaft head is provided with a third connecting plane which is in close contact with the first connecting plane, and the end of the magnetic shielding block is fixedly connected with the axial magnetically conductive shaft head by at least two connecting bolts. Since only two alternating radial magnetic pole surfaces with opposite polarities are needed at this time, only a whole first radial magnetic flux magnet block itself can be used as a radial magnetic flux generating block, and correspondingly, the fixing mode adopts a clamping type connection, two magnetic shielding blocks equivalent to two fixed clamps clamp the first radial magnetic flux magnet block in the middle, the end of the magnetic shielding block is in close contact with the third connecting plane provided on the outer side of the axial magnetically conductive shaft head through the first connecting plane, and fixed connection is achieved through connecting bolts, and finally the ALA core block, the magnetic shielding block and the first radial magnetic flux magnet block are pressed and fixed to form an ALA rotor core module through a radial fixing ring, which is simple in structure and fast and convenient in installation process.

[0012] Preferably, the end of the ALA core block is radially inwardly retracted to form a semicircular connecting head, two semicircular connecting heads are relatively folded to form a first cylindrical connecting head, and the inside of the axial magnetically conductive shaft head is provided with a first fixing cavity for accommodating and fixing the first cylindrical connecting head and is fixedly sleeved on the first cylindrical connecting head.

[0013] The axial magnetic flux magnetic steel is in a half-arc structure and symmetrically arranged at the same end of the two axial magnetic flux magnetic steels, the axial magnetic flux magnetic steel is fixedly arranged in the first axial magnetic steel mounting cavity and is tightly arranged between the axial magnetic flux head and the ALA core block with the same polarity and located at the outer circumferential side of the semi-circular connector. The axial magnetic flux head passes through the first fixing cavity and is fixedly sleeved on the first cylindrical connector, which enhances the connection stability of the ALA core block and the axial magnetic flux head during actual operation, facilitates positioning during installation, and ensures the coaxiality of the overall structure; the axial magnetic flux magnetic steel is arranged between the ALA core block with the same polarity and the axial magnetic flux head, forming an axial magnetic circuit, improving the saliency ratio and torque density; the two axial magnetic flux magnetic steels are in a half-arc structure and are symmetrically arranged, forming a whole circular structure embedded in the annular first axial magnetic steel mounting cavity, effectively improving the balance of the magnetic circuit.

[0014] Preferably, the first limiting keys are arranged on the outer sides of the semi-circular connectors in the axial direction, the first limiting keys on the two semi-circular connectors are symmetric to each other, two first limiting grooves corresponding to the first limiting keys are symmetrically and recessed on the inner wall of the first fixing cavity in the axial direction, and the first limiting keys are fixedly embedded in the first limiting grooves. The relative rotation between the ALA core block and the axial magnetic flux head is limited by the key and groove mechanism, so that the overall structure can keep synchronous high-speed rotation during operation.

[0015] Preferably, when N≥4, the radial magnetic flux generating block includes a magnetic core shaft and N blocks of second radial magnetic flux magnetic steel blocks in a trapezoidal structure, the middle part of the magnetic core shaft is uniformly contracted radially inward compared with the end part side surface to form an annular mounting part with N circumferentially uniformly distributed magnetic steel mounting planes, each second radial magnetic flux magnetic steel block is arranged on one magnetic steel mounting plane, the end circumferential side of the magnetic core shaft is provided with N end circumferential sides flush with the outer sides of the second radial magnetic flux magnetic steel blocks, the inner side of each ALA core block is one-to-one abutted to the outer side of one second radial magnetic flux magnetic steel block and the end circumferential side of the magnetic core shaft, and the magnetic shielding block is in an arc structure and is clamped to the outer side of the gap formed between the two adjacent ALA core blocks.

[0016] The end of the ALA iron core block is radially inwardly retracted to form a flat connector with an arc outer side and a flat inner side, the flat connector is attached to the end peripheral side of the magnetic core shaft, N flat connectors and the end of the magnetic core shaft form a second cylindrical connector, and the inside of the axial magnetic shaft head is provided with a second fixing cavity for accommodating and fixing the second cylindrical connector and fixedly sleeving the second cylindrical connector;

[0017] The axial magnetic shaft head is located at the outer peripheral surface of the inner end opening of the second fixing cavity to form a fixing platform, the fixing platform is recessed to form a second axial magnetic steel mounting cavity, the axial magnetic flux magnetic steel is fixedly arranged in the second axial magnetic steel mounting cavity and tightly arranged between the platform surface of the axial magnetic shaft head and the flat connector on the ALA iron core block, and the axial inner end of the axial magnetic flux magnetic steel is flush with the axial inner end of the axial magnetic shaft head.

[0018] In the above structure, the magnetic steel mounting planes in different directions are formed by the magnetic core shaft, the second radial magnetic flux magnetic steel block only needs to be formed into a trapezoidal or rectangular structure with two flat sides for direct mounting and fixing, without the need for a curved structure, which is convenient for processing and manufacturing; after the radial magnetic flux magnetic steel block is mounted, the ALA iron core block and the magnetic shielding block with specific structures are respectively mounted and fixed, and the whole is fixed by a plurality of components, which are assembled and formed as a whole, the components are convenient to process, the installation process is simple and convenient, and a uniform radial magnetic field can be provided; the N flat connectors and the end of the magnetic core shaft form a second cylindrical connector, the axial magnetic shaft head is fixedly sleeved on the second cylindrical connector through the second fixing cavity, the structure design is ingenious, and the mutual connection is strong after being fixed; the axial magnetic flux magnetic steel is placed in the second axial magnetic steel mounting cavity with the same depth as the thickness of the axial magnetic flux magnetic steel, which can ensure stable placement without shaking and effectively protect the axial magnetic flux magnetic steel from being subjected to a large pressure.

[0019] Preferably, two oppositely arranged flat connectors are symmetrically provided with first connecting pin holes, the end of the magnetic core shaft is provided with a second connecting pin hole aligned with the two first connecting pin holes, and the two sides of the axial magnetic shaft head are symmetrically provided with two third connecting pin holes aligned with the first connecting pin holes and the second connecting pin hole, the first connecting pin hole, the second connecting pin hole and the third connecting pin hole form a pin hole connection channel, and a connecting rivet is penetratingly arranged in the pin hole connection channel to connect and fix the axial magnetic shaft head, the flat connector and the magnetic core shaft. Only one connecting rivet is needed to achieve firm connection between the ALA rotor iron core module and the axial magnetic shaft head, which is simple in structure, convenient in processing and installation process, and good in connection stability.

[0020] Preferably, the axial flux magnetic steel and the second axial flux magnetic steel mounting cavity are arc-shaped structures in shape matching. Each axial flux magnetic steel and the second axial flux magnetic steel mounting cavity are arc-shaped structures, and the whole constitutes a circular structure, and the magnetic circuit balance during operation is better.

[0021] Preferably, at least one weight-reducing through hole is arranged in the interior of the magnetic isolation block in the axial direction. The weight-reducing through hole arranged in the interior of 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 DRAWINGS

[0022] Figure 1 It is a structure exploded view and a partial structure sectional view of the embodiment one in the application.

[0023] Figure 2 It is a partial structure schematic view of the embodiment one in the application.

[0024] Figure 3 It is a structure schematic view of the axial magnetic guide shaft head of the embodiment one in the application.

[0025] Figure 4 It is an overall structure sectional view of the ALA rotor and the external stator after assembly in the embodiment one in the application.

[0026] Figure 5 It is a magnetic circuit schematic view of the ALA rotor and the external stator after assembly in the embodiment one in the application in the use state.

[0027] Figure 6 It is a torque-time relationship simulation diagram of the existing permanent magnet assisted synchronous reluctance motor with a two-pole ALA rotor.

[0028] Figure 7 It is a torque-time relationship simulation diagram of the permanent magnet assisted synchronous reluctance motor with the ALA rotor of the embodiment one of the application.

[0029] Figure 8 It is a structure exploded view and a partial structure sectional view of the embodiment two in the application.

[0030] Figure 9 It is a structure schematic view of the axial magnetic guide shaft head of the embodiment two in the application.

[0031] Figure 10 It is a structure schematic view of the magnetic guide core shaft of the embodiment two in the application.

[0032] Figure 11 It is a structure schematic view of the ALA core block of the embodiment two in the application.

[0033] Figure 12Structure diagram of the magnetic isolation block in Example 2 of the present application;

[0034] Figure 13 Structure diagram of part of Example 2 of the present application.

[0035] Explanation of reference signs:

[0036] 1, axial magnetic guide shaft head; 11, third connecting plane; 12, first fixed cavity; 13, first axial magnetic steel mounting cavity; 14, first limiting groove; 15, second fixed cavity; 16, fixed table surface; 17, second axial magnetic steel mounting cavity; 18, third connecting pin hole; 19, connecting rivet;

[0037] 21, alternating radial magnetic pole surface; 22, first radial magnetic flux magnetic steel block; 23, magnetic guide core shaft; 231, magnetic steel mounting plane; 232, annular mounting part; 233, end peripheral surface; 234, second connecting pin hole; 24, second radial magnetic flux magnetic steel block;

[0038] 3, ALA iron core block; 31, second connecting plane; 32, semicircular connecting head; 33, first cylindrical connecting head; 34, platform surface; 35, first limiting key; 36, flat connecting head; 361, first connecting pin hole; 37, second cylindrical connecting head;

[0039] 4, magnetic isolation block; 41, first connecting plane; 42, weight-reducing through hole; 5, cylindrical surface; 51, annular groove; 6, radial fixing ring; 7, ALA rotor iron core module; 8, axial magnetic flux magnetic steel. DETAILED DESCRIPTION

[0040] The present application will be further described in detail below with reference to the accompanying drawings. It should be noted that the axial outer end of each structure refers to the end part away from the axial middle part of the ALA iron core block 3 along the axial direction, and the axial inner end refers to the end part toward the axial middle part of the ALA iron core block 3 along the axial direction.

[0041] Example 1: as Figures 1-5As shown, the ALA rotor of a permanent magnet assisted synchronous reluctance motor includes two axial magnetically conductive shaft heads 1, a radial magnetic flux generating block, N ALA core blocks 3 and N magnetic isolation blocks 4. The ALA core blocks 3 are formed by interlaced and laminated flat magnetically conductive and non-magnetic laminations. N is the number of poles of the ALA rotor. The radial magnetic flux generating block is uniformly provided with N / 2 pairs of symmetrically distributed alternating radial magnetic pole faces 21. The polarities of the radially outer sides of two adjacent alternating radial magnetic pole faces 21 are opposite. Each ALA core block 3 is individually attached to an alternating radial magnetic pole face 21. The N ALA core blocks 3 and the N magnetic isolation blocks 4 are circumferentially alternately arranged. The outer circumferential surface of the ALA core block 3 and the outer circumferential surface of the magnetic isolation block 4 jointly form a cylindrical surface 5. Four annular grooves 51 are arranged on the cylindrical surface 5 in an axial direction. Two annular grooves 51 are arranged on the circumferential sides of the two ends of the cylindrical surface 5. The radial fixing ring 6 is embedded in the annular groove 51. The radial fixing ring 6 tightly 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 fixedly connected to an axial magnetically conductive shaft head 1. At least one end of each ALA core block 3 is fixedly connected to the axial magnetically conductive shaft head 1. The axial magnetic flux magnet 8 is arranged between the axial magnetically conductive shaft head 1 and the ALA core block 3. The polarity of the axial outer end of the axial magnetic flux magnet 8 is opposite to the polarity of the outer side of the corresponding alternating radial magnetic pole face 21 of the ALA core block 3.

[0042] In the first embodiment, N=2, the radial magnetic flux generating block is a first radial magnetic flux magnet block 22 fixedly clamped between the two ALA core blocks 3 and the two magnetic isolation blocks 4. The radially inner side of the magnetic isolation block 4 forms a first connecting plane 41. The radially outer side of the first radial magnetic flux magnet block 22 is aligned with the radially outer side of the ALA core block 3 and forms a second connecting plane 31 which is in contact with the first connecting plane 41. The outer side of the axial magnetically conductive shaft head 1 is provided with a third connecting plane 11 which is in contact with the first connecting plane 41. The end of the magnetic isolation block 4 is fixedly connected to the axial magnetically conductive shaft head 1 by at least two connecting bolts. The first radial magnetic flux magnet block 22 is located between the two ALA core blocks 3 and the two magnetic isolation blocks 4, which enhances the radial magnetic field and improves the torque density.

[0043] The end of the ALA core block 3 is radially inwardly retracted to form a semicircular connecting head 32. The two semicircular connecting heads 32 are relatively folded to form a first cylindrical connecting head 33. The inner part of the axial magnetically conductive shaft head 1 is provided with a first fixing cavity 12 for accommodating and fixedly sleeving the first cylindrical connecting head 33. The number of annular grooves 51 is at least two, and four are used here. Two annular grooves 51 are located at the two ends, so that the radial fixing ring 6 located therein tightens the end of the cylindrical surface 5, which improves the connection firmness and facilitates the installation and fixation between the first cylindrical connecting head 33 and the first fixing cavity 12 of the axial magnetically conductive shaft head 1.

[0044] The axial flux magnets 8 have a semi-arc structure, and two axial flux magnets 8 located at the same end are symmetrically arranged. The axial guide magnet head 1 is recessed on the peripheral plane of the axial inner end opening of the first fixed cavity 12, and an annular first axial magnet mounting cavity 13 is provided. The axial flux magnets 8 are fixedly arranged in the first axial magnet mounting cavity 13 and pressed between the axial guide magnet head 1 and the platform surface 34 on the outer peripheral side of the semi-circular connector 32 on the same polarity ALA iron core block 3. The axial flux magnets 8 are arranged between the end of the ALA iron core block 3 and the axial guide magnet head 1 to form an axial magnetic circuit, which improves the saliency rate and torque density. Preferably, two axial flux magnets 8 are symmetrically arranged at both ends of the ALA iron core block 3 for better magnetic circuit balance.

[0045] A first limiting key 35 is provided on the outer side of the semi-circular connector 32 along the axial direction, and the first limiting keys 35 on the two semi-circular connectors 32 are symmetrical to each other. Two first limiting grooves 14 corresponding to the first limiting keys 35 are symmetrically and axially recessed on the inner wall of the first fixed cavity 12. The first limiting key 35 is fixedly embedded in the first limiting groove 14.

[0046] Figure 6 , Figure 7 In the diagram, the y-axis represents torque, and the x-axis represents time. Figure 6 , Figure 7 The comparison shows that, compared with the traditional permanent magnet assisted synchronous reluctance motor using a two-pole ALA rotor, the structure of the above embodiment 1 improves both torque density and power density by 45.8%.

[0047] In addition, it also applies to... Figure 6 , Figure 7 The magnetic field cloud diagrams of the corresponding ALA rotor were simulated and compared. The comparison results show that, compared with the existing synchronous reluctance motors with permanent magnet assistance using a two-pole ALA rotor, the synchronous reluctance motor with permanent magnet assistance using the ALA rotor of this embodiment has an effective permanent magnet magnetic field. Therefore, it can be proved that the structure of this embodiment fully utilizes the permanent magnet magnetic field compared with the existing structure, which greatly improves the power density and torque density of the motor.

[0048] Example 2: Figures 8-13The rest is the same as example one, the difference is that when N≥4, specifically, here N=6, the radial magnetic flux generating block includes a magnetic conducting shaft 23 and N pieces of trapezoidal structure second radial magnetic flux magnetic steel blocks 24, the middle part of the magnetic conducting shaft 23 is uniformly contracted radially inward compared to the end part side surface to form an annular mounting part 232 with N circumferentially uniformly distributed magnetic steel mounting planes 231, each second radial magnetic flux magnetic steel block 24 is arranged on a magnetic steel mounting plane 231, the end part circumferential side of the magnetic conducting shaft 23 is provided with N end part circumferential side surfaces 233 flush with the outer side surface of the second radial magnetic flux magnetic steel block 24, the inner side of each ALA iron core block 3 is one-to-one abutting to the outer side of a second radial magnetic flux magnetic steel block 24 and the end part circumferential side surface 233 of the magnetic conducting shaft 23, the magnetic shielding block 4 is arc-shaped and clamped on the outer side of the gap between the two adjacent ALA iron core blocks 3, the second radial magnetic flux magnetic steel block 24 adopts trapezoidal structure or rectangular structure when it is multi-pole, which is convenient for manufacturing and provides uniform radial magnetic field.

[0049] The end part of the ALA iron core block 3 is radially inwardly contracted to form a flat type connector 36 with arc outer side and flat inner side, the flat type connector 36 is abutting to the end part circumferential side surface 233 of the magnetic conducting shaft 23, the N flat type connectors 36 and the end part of the magnetic conducting shaft 23 together form a second cylindrical connector 37, the inside of the axial magnetic conducting shaft head 1 is provided with a second fixing cavity 15 for accommodating and fixing the second cylindrical connector 37 and is fixedly sleeved on the second cylindrical connector 37.

[0050] The axial magnetic conducting shaft head 1 is located at the outer circumferential surface of the inner end opening of the second fixing cavity 15 to form a fixing table surface 16, the fixing table surface 16 is recessed to form a second axial magnetic steel mounting cavity 17, 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 magnetic conducting shaft head 1 and the platform surface 34 of the ALA iron core block 3 on the outer circumferential side of the flat type connector 36, the axial inner end of the axial magnetic flux magnetic steel 8 is flush with the axial inner end of the axial magnetic conducting shaft head 1, the axial magnetic flux magnetic steel 8 and the second axial magnetic steel mounting cavity 17 are both arc-shaped structures matched in shape.

[0051] The two oppositely arranged flat type connectors 36 are symmetrically provided with first connecting pin holes 361, the end part of the magnetic conducting shaft 23 is provided with a second connecting pin hole 234 aligned with the two first connecting pin holes 361, the two sides of the axial magnetic conducting shaft head 1 are symmetrically provided with two third connecting pin holes 18 aligned with the first connecting pin holes 361 and the second connecting pin hole 234, the first connecting pin holes 361, the second connecting pin hole 234 and the third connecting pin holes 18 together form a pin hole connecting channel, a connecting rivet 19 is penetratingly arranged in the pin hole connecting channel and connects and fixes the axial magnetic conducting shaft head 1, the flat type connector 36 and the magnetic conducting shaft 23.

[0052] The inside of the magnetic isolation block 4 is provided with two weight-reducing through holes 42 in the axial direction. The number of the weight-reducing through holes 42 can also be one or more than three according to actual needs.

[0053] The manufacturing method of each component in the above embodiment two is as follows:

[0054] P1, the ALA rotor core module 7 is punched or formed by a die from magnetic silicon steel sheets and magnetic isolation sheets, and is formed by stacking the magnetic sheets and the magnetic isolation sheets alternately. The magnetic isolation sheets can be made of metals such as copper and aluminum or non-metallic materials such as carbon fibers. The stacking method includes riveting, dovetail groove connection, etc.

[0055] P2, the magnetic core shaft 23 is formed by forging and pressing, and is processed into a regular polygon according to the number of poles. The middle part of the magnetic core shaft 23 forms an annular mounting part 232 with a magnetic steel mounting plane 231. The protruding parts at both ends are inserted into the axial magnetic shaft head 1 after being spliced with the ALA core block 3. The second connecting pin hole 234 is provided at both ends of the magnetic core shaft 23.

[0056] P3, the magnetic isolation block 4 is formed by aluminum die casting, and the annular groove 51 is processed by turning. The second axial magnetic steel mounting cavity 17 and the second limiting groove 151 are formed by milling, and the third connecting pin hole 18 is drilled.

[0057] P4, the radial fixing ring 6 is made of carbon fiber and is hot-fitted or wound on site.

[0058] The assembly process of the above embodiment two is as follows:

[0059] S1, the second radial magnetic flux magnetic steel block 24 is attached to the magnetic steel mounting plane 231 of the magnetic core shaft 23;

[0060] S2, the ALA core block 3 is installed outside the second radial magnetic flux magnetic steel block 24, and is aligned with the end part of the magnetic core shaft 23;

[0061] S3, the axial magnetic flux magnetic steel 8 is installed into the second axial magnetic steel mounting cavity 17 and is sleeved into the axial magnetic shaft head 1;

[0062] S4, the connecting rivet 19 is inserted into the pin hole connection channel;

[0063] S5, the magnetic isolation block 4 is installed into the gap of the ALA core block 3, and the radial fixing ring 6 is wound;

[0064] S6, the ALA rotor outer circle is turned / grinded to optimize dynamic balance.

Claims

1. An ALA rotor for a permanent magnet assisted synchronous reluctance motor, characterized in that... The system includes two axially guided magnetic shaft heads, a radial magnetic flux generating block, N ALA iron core blocks, and N magnetic isolation blocks. The ALA iron core blocks are formed by alternating layers of flat, magnetically conductive laminations and flat, non-magnetically conductive laminations. N represents the number of poles of the ALA rotor. The radial magnetic flux generating block has N / 2 pairs of symmetrically distributed alternating radial magnetic pole surfaces evenly arranged circumferentially. The outer polarities of adjacent alternating radial magnetic pole surfaces are opposite. Each ALA iron core block is individually attached to one of the alternating radial magnetic pole surfaces. The N ALA iron core blocks and N magnetic isolation blocks are arranged alternately circumferentially, with the outer circumferential surfaces of the ALA iron core blocks and the magnetic isolation blocks together forming a circle. The cylindrical surface has at least two annular grooves spaced apart along the axial direction. A radial fixing ring is embedded in each 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. Both ends of the ALA rotor core module are fixedly connected to an axial magnetic guide shaft head. An axial magnetic flux magnet is fixedly disposed between at least one end of each ALA core block and the axial magnetic guide shaft head. The polarity of the outer axial end of the axial magnetic flux magnet is opposite to the polarity of the outer side 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 periphery 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 magnet fixedly clamped between the two ALA iron core blocks and the two magnetic isolation blocks. The radial inner side of the magnetic isolation block forms a first connecting plane, and the radial outer side of the first radial flux magnet is aligned with the radial outer side of the ALA iron core block and forms a second connecting plane that fits against the first connecting plane. The outer side of the axial magnetic guide shaft head is provided with a third connecting plane that fits against the first connecting plane. 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 block are radially contracted inward to form a semi-circular connector. Two semi-circular connectors are joined together to form a first cylindrical connector. The axial magnetic guide shaft head has a first fixing cavity inside for accommodating and fixing the first cylindrical connector and is fixedly sleeved on the first cylindrical connector. The axial flux magnets are semi-arc structures, and two axial flux magnets located at the same end are symmetrically arranged. The axial guide magnet head is recessed on the peripheral plane of the axial inner end opening of the fixed cavity, and an annular first axial magnet mounting cavity is provided. The axial flux magnets are fixedly arranged in the first axial magnet mounting cavity and pressed between the axial guide magnet head and the ALA iron core block of the same polarity located on the platform surface on the outer peripheral side of the semi-circular connector.

5. The ALA rotor of a permanent magnet assisted synchronous reluctance motor according to claim 4, characterized in that... The outer side of the semicircular connector is provided with a first limiting key along the axial direction, and the first limiting keys on the two semicircular connectors are symmetrical to each other. The inner wall of the first fixing cavity is symmetrically and axially recessed with two first limiting grooves corresponding to the first limiting keys. The first limiting key is fixedly embedded in the first limiting 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 flux generating block includes a magnetic core shaft and N trapezoidal second radial flux magnet blocks. The middle part of the magnetic core shaft is radially and uniformly contracted inward compared to the end side to form an annular mounting part with N circumferentially evenly distributed magnet mounting planes. Each of the second radial flux magnet blocks is attached to a magnet mounting plane. The end circumference of the magnetic core shaft is provided with N end circumferential sides that are flush with the outer side of the second radial flux magnet blocks. The inner side of each ALA iron core block is attached one-to-one to the outer side of a second radial flux magnet block and the end circumferential side 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 iron core blocks. The ends of the ALA core block are radially contracted inward to form a flat connector with an outer arc surface and an inner plane. The flat connector is attached to the circumferential side 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 axial magnetic core 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 guide magnet head forms a fixed platform on the outer peripheral surface of the inner end opening of the second fixed cavity. A second axial magnet mounting cavity is recessed on the fixed platform. The axial flux magnet is fixedly installed in the second axial magnet mounting cavity and pressed between the axial guide magnet 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 flux magnet is flush with the axial inner end of the axial guide magnet head.

7. The ALA rotor of a permanent magnet assisted synchronous reluctance motor according to claim 6, characterized in that... Two flat connectors arranged opposite each other are symmetrically provided with first connecting pin holes. The end of the magnetic core shaft is provided with a second connecting pin hole aligned with the two first connecting pin holes. Two third connecting pin holes are symmetrically provided on both sides of the axial magnetic shaft head, aligned with the first connecting pin holes and the second connecting pin holes. The first connecting pin holes, the second connecting pin holes and the third connecting pin holes together form a pin hole connection channel. A connecting rivet is provided through 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... Both the axial flux magnet and the second axial magnet mounting cavity are 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... The magnetic shielding block has at least one weight-reducing through hole running through it axially.

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