Motor rotor and generator

Abstract

The invention discloses a motor rotor and a generator, and relates to the technical field of motors, the motor rotor comprises a rotor support, a plurality of magnetic pole units are uniformly assembled on the side wall of the rotor support in the circumferential direction, and an inter-pole gap is reserved between every two adjacent magnetic pole units; each magnetic pole unit comprises a magnetic pole permanent magnet attached to the side wall of the rotor support, a pressing strip and an inter-pole magnetism gathering permanent magnet are assembled at the inter-pole gap, the inter-pole magnetism gathering permanent magnet is attached to the side wall of the rotor support, and the left end and the right end of the inter-pole magnetism gathering permanent magnet abut against the magnetic pole permanent magnet. The pressing strips are assembled on the interelectrode magnetism gathering permanent magnets and fixed through the fixing pieces, and the pressing strips and the fixing pieces press and fix the magnetic pole permanent magnets and the interelectrode magnetism gathering permanent magnets on the side wall of the rotor support. The motor rotor provided by the invention is obvious in magnetism gathering effect and has an air-gap magnetic field which is closer to sine distribution, and due to the existence of the magnetism gathering permanent magnets, the gap between poles is filled up, so that the surface of the rotor is smoother, and the wind friction loss is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more particularly to a motor rotor and a generator. Background Art

[0002] At present, mainstream wind turbines can be divided into permanent magnet direct drive, permanent magnet semi-direct drive, doubly fed, and high-speed permanent magnet. Permanent magnet wind turbines have a low speed of only about 10r / min. Due to their simple structure and the absence of vulnerable parts such as gearboxes, they are favored by the market.

[0003] Existing permanent magnet wind turbines come in two types: inner rotor and outer rotor. An inner rotor is located inside the stator core, with the permanent magnets mounted on the inner side of the rotor support. An outer rotor is located outside the stator core, with the permanent magnets mounted on the outer side of the rotor support.

[0004] For the inner rotor form, the magnet is mainly embedded in the pole box, and multiple pole boxes are fastened to the rotor bracket through a large number of bolts. However, this method has a large number of bolts, a large amount of installation work, a long installation cycle, and cumbersome process steps, which increases production costs and is not conducive to mass production of products.

[0005] For the external rotor form, the permanent magnet can only be fixed to the rotor base by bolts in the form of an embedded magnetic steel frame. This technical structure is relatively complex, involves cumbersome process steps, and has a long installation cycle. In addition, due to the existence of the magnetic steel frame, it will lead to disadvantages such as low space utilization, large yoke thickness, and increased weight of the entire machine.

[0006] Therefore, further optimizing the rotor and permanent magnets in permanent magnet direct drive (PMDD) has become a key challenge recognized by the industry. The use of a rectangular concentrated permanent magnet rotor array (a permanent magnet arrangement that combines radial and tangential permanent magnets to produce the strongest magnetic field with the least amount of magnets) is one of the key solutions to current PMD technology challenges. Summary of the Invention

[0007] In order to overcome the above-mentioned defects in the prior art, the present invention discloses a motor rotor and a generator. The purpose of the present invention is to solve the problems of long installation period and complicated process steps in the prior art of the inner and outer rotor forms.

[0008] In order to achieve the above objectives, the present invention adopts the following technical solutions: A motor rotor comprises a rotor support, wherein a plurality of magnetic pole units are evenly arranged on a side wall of the rotor support along a circumferential direction, and an interpolar gap is left between two adjacent magnetic pole units; Each magnetic pole unit includes a magnetic pole permanent magnet attached to the side wall of the rotor bracket, and a pressure strip and an inter-pole magnetic focusing permanent magnet are installed at the inter-pole gap. The inter-pole magnetic focusing permanent magnet is attached to the side wall of the rotor bracket and the left and right ends are against the magnetic pole permanent magnet. The pressure strip is installed on the inter-pole magnetic focusing permanent magnet and is fixed by a fixing piece. The pressure strip and the fixing piece press the magnetic pole permanent magnet and the inter-pole magnetic focusing permanent magnet to the side wall of the rotor bracket.

[0009] Preferably, the motor rotor is in the form of an inner rotor, and the pressure strips and fixing parts press and fix the pole permanent magnets and inter-pole magnetic focusing permanent magnets on the outer wall of the rotor bracket. A plurality of baffles are assembled on both axial sides of the rotor bracket by bolts, and the pole permanent magnets, pressure strips, and inter-pole magnetic focusing permanent magnets are all located between the two axial baffles.

[0010] Preferably, the rotor bracket is an outer polygonal and inner circular structure, and a magnetic pole unit is arranged on each face of the outer polygon. In each magnetic pole unit, multiple permanent magnets are closely arranged in a straight line and the inner end is in contact with the outer wall surface of the rotor bracket. A pole shoe structure is provided at the outer end. The left and right ends of the pole shoe structure are abutted against the pressure strips of the inter-pole gap and are tightened by the pressure strips. The pole shoe structure is composed of multiple pole shoe punchings and is provided with an axial tightening hole. The double-headed stud passes through the axial tightening hole and the front and rear ends are fixed to the baffle by nuts.

[0011] Preferably, the fixing part is a first pressure strip bolt, a plurality of first bolt counterbores are provided on the side wall of the rotor bracket, a plurality of first screw holes are provided on the pressure strip, and a plurality of first tightening circular holes are provided on the inter-pole magnetic permanent magnet. The first pressure strip bolt passes through the first bolt counterbores and the first tightening circular hole and is threadedly assembled on the first screw hole.

[0012] Preferably, the pole shoe structure is trapezoidal or arch-shaped. When the arch shape is adopted, the outer diameter of the arc is concentric or eccentric with the rotor bracket. The pole shoe structure is made by laminating high magnetic permeability punching sheets with a thickness of 0.3mm~1.5mm.

[0013] Preferably, the number of sides of the outer polygon of the rotor support is a, a≥4; in each magnetic pole unit, the number of the magnetic pole permanent magnets is b, 3≤b≤15; The plurality of magnetic pole permanent magnets are regularly distributed in the circumferential and axial directions of the rotor support, specifically: uniformly distributed along the circumference of the rotor support in the circumferential direction, and aligned and uniformly distributed along a straight line in the axial direction.

[0014] Preferably, a fastening gap is reserved between the inter-pole magnetic concentrating permanent magnet and the rotor bracket, the fastening gap has a thickness of 0.5 mm to 3 mm, and the fastening gap is filled with flexible material.

[0015] Preferably, the inter-pole concentrating permanent magnet is a bonded permanent magnet, which is a split-type or integrated type. The magnetization angle of the split-type inter-pole concentrating permanent magnet is 0°-60°, and the magnetization angle of the integrated inter-pole concentrating permanent magnet is 90°.

[0016] Preferably, the bead is dove-tail shaped, and the inter-pole magnetic permanent magnet is trapezoidal; the rotor bracket is made of high-magnetic-permeability steel, and the bead is made of weak-magnetic or non-magnetic material.

[0017] Preferably, the rotor bracket is a circular barrel-shaped structure, and a plurality of axial through-type notches are provided on the outer circular surface of the rotor bracket. The magnetic pole permanent magnet is an integrated arc-shaped structure, and a protrusion is provided on the inner arc surface along the axial direction, and the protrusion is assembled on the through-type notches.

[0018] Preferably, the fixing member is a collar, and the collar is sleeved on the outside of the pole permanent magnet and the pressure strip.

[0019] Preferably, the pole permanent magnet is a bonded permanent magnet, the inner arc radius of the pole permanent magnet is equal to the outer circle radius of the rotor bracket, and the protrusion of the pole permanent magnet is consistent in shape with the through-notch of the rotor bracket.

[0020] Preferably, the collar is a hollow circular tube with a thickness of 2 to 6 cm. The inner radius of the collar is equal to the outer radius of the arc-shaped magnetic pole permanent magnet and the outer radius of the layering strip. The collar is made of weak magnetic or non-magnetic material.

[0021] Preferably, the motor rotor is in the form of an outer rotor, the pressure strips and the fixing parts press and fix the pole permanent magnets and the inter-pole magnetic focusing permanent magnets on the inner side wall of the rotor bracket, and the rotor bracket is barrel-shaped.

[0022] Preferably, the fixing part is a second pressure strip bolt, a plurality of second bolt counterbores are provided on the side wall of the rotor bracket, a plurality of second screw holes are provided on the pressure strip, a plurality of second tightening circular holes are provided on the inter-pole magnetic permanent magnet, and the second pressure strip bolt passes through the second screw hole and the second tightening circular hole and is threadedly assembled on the second bolt counterbores.

[0023] Preferably, the pole permanent magnet is a bonded integral permanent magnet, which is arranged at an axial oblique angle when installed on the inner circle of the rotor bracket. The pole permanent magnet is arc-shaped, and has inclined surfaces on both sides of the arc-shaped inner circle for embedding the pressure strip. The outer arc radius of the arc-shaped pole permanent magnet is equal to the inner circle radius of the rotor bracket.

[0024] Based on the above motor rotor, the present invention further provides a generator, comprising a motor rotor and a stator core; When the motor rotor is an inner rotor, the motor rotor is inserted into the stator core; When the motor rotor is an outer rotor, the stator core is inserted into the motor rotor.

[0025] Beneficial effects of the present invention: The motor rotor provided by the present invention has an inner rotor form, and a pressure strip and an inter-pole magnet-concentrating permanent magnet are installed at the inter-pole gap. The inter-pole magnet-concentrating permanent magnet is attached to the side wall of the rotor bracket and the left and right ends are against the magnetic pole permanent magnet. The pressure strip is installed on the inter-pole magnet-concentrating permanent magnet and is fixed by a fixing piece. The pressure strip and the fixing piece press the magnetic pole permanent magnet and the inter-pole magnet-concentrating permanent magnet to the side wall of the rotor bracket. The fixing piece can be a bolt or a collar. When it is a bolt, it is provided with a pole shoe structure. When it is a collar, it is provided with a protrusion and a through-type notch. Compared with the prior art in which the magnetic steel is embedded in the magnetic pole box and a large number of bolts are used to fix the magnetic pole box to the rotor bracket, the present invention uses pressure strips and fixing pieces, and the number of bolts required is relatively small, the installation work is relatively small, the installation period is relatively short, the process is relatively simple, and the production cost is relatively low, which is conducive to the mass production of the product.

[0026] The motor rotor provided by the present invention has an outer rotor form, and a pressure strip and an inter-pole magnetic concentrating permanent magnet are installed at the inter-pole gap. The inter-pole magnetic concentrating permanent magnet is attached to the side wall of the rotor bracket and the left and right ends are against the magnetic pole permanent magnet. The pressure strip is assembled on the inter-pole magnetic concentrating permanent magnet and fixed by a fixing piece. The pressure strip and the fixing piece press the magnetic pole permanent magnet and the inter-pole magnetic concentrating permanent magnet to the side wall of the rotor bracket. The fixing piece is a bolt. Compared with the prior art, the permanent magnet can only be fixed to the rotor base by bolts in the form of an embedded magnetic steel frame. The present invention uses a pressure strip and a fixing piece, fixes the pressure strip by the fixing piece, and then fixes the magnetic pole permanent magnet and the inter-pole magnetic concentrating permanent magnet by the pressure strip. The structure is relatively simple, the process involved is simple, and the installation period is short. In addition, there is no magnetic steel frame, thereby improving the space utilization.

[0027] The motor rotor provided by the present invention has a significant magnetic field concentration effect and an air gap magnetic field that is closer to a sinusoidal distribution. When the amount of permanent magnet material used is the same, the air gap magnetic flux density is greater and the iron loss is smaller. The yoke thickness is reduced, the rotor weight is reduced, and the power density is improved. In addition, due to the presence of the magnetic field concentration permanent magnet, the gaps between the poles are filled, making the rotor surface smoother and reducing wind friction loss.

[0028] The motor rotor provided by the present invention is provided with an inter-pole magnetic permanent magnet at the inter-pole gap. On the one hand, it is compressed by a pressure strip, and at the same time, the left and right ends of the inter-pole magnetic permanent magnet are against the magnetic pole permanent magnet. While the inter-pole magnetic permanent magnet is fixed, force is applied to the magnetic pole permanent magnets on the left and right ends to assist in fixing it. On the other hand, the presence of the inter-pole magnetic permanent magnet fills the gap between the poles, making the rotor surface smoother and reducing wind friction loss. In addition, the use of the inter-pole magnetic permanent magnet can enhance the single-sided magnetic flux linkage, reduce the wall thickness of the rotor bracket, increase the air gap magnetic density, reduce the weight, and reduce the rotor eddy current loss.

[0029] The motor rotor provided by the present invention has the following forms: ① Inner rotor form, the pole permanent magnets and inter-pole magnetizing permanent magnets are fixed to the combined pressure strips and pole shoe structures with bolts. The pole permanent magnets are multiple permanent magnets that are closely arranged in a straight line.

[0030] Bolt-on pressure strips offer flexible assembly, ease of disassembly and maintenance, and simple adjustment (bolt preload controls contact pressure, reducing the risk of loosening). They are also adaptable (suitable for installations of various sizes). The pole shoe structure, composed of multiple punched plates of a certain thickness, secures the permanent magnets while reducing eddy current losses.

[0031] The magnetic pole permanent magnets are multiple permanent magnets arranged closely together in a straight line. For this type of permanent magnet, the process is simple, easy to process and assemble, so the cost is low, and it can be easily divided into small pieces (dividing into small pieces is equivalent to shortening the leakage magnetic path, and the less distance traveled, the less energy consumed), which also reduces the leakage magnetic field.

[0032] The above motor rotor is suitable for the following operating conditions: a simple straight-line structure, easy manufacturing and assembly, and low cost. It also features a symmetrical magnetic circuit and uniform magnetic field distribution, making it suitable for high speeds and applications with less stringent requirements for performance and torque ripple.

[0033] ② Inner rotor form, the rotor bracket and the pole permanent magnet are limited by the protrusion and the through-notch. At the same time, the collar is put on the outside of the pole permanent magnet and the pressure strip to fix them. The pole permanent magnet is an integrated arc structure.

[0034] The rotor bracket and permanent pole magnets are secured by protrusions and through-cut notches, facilitating positioning and installation while also resisting tangential forces. A collar secures the permanent pole magnets and the pressure strips. Made of weakly magnetic or non-magnetic materials (primarily carbon fiber), the collar significantly reduces rotor weight, offers high specific strength, and reduces moment of inertia, improving motor response speed. The outer collar, secured by the collar, withstands centrifugal forces at high speeds. Similarly, the fibers reduce eddy current losses. The collar's smooth surface reduces wind friction losses.

[0035] The pole permanent magnet is an integrated arc structure, which fits better with the cylindrical rotor bracket and collar. The integrated structure has good rigidity, simple manufacturing and processing, and can be directly formed.

[0036] The applicable working conditions of the above motor rotor are: high speed, and its non-magnetic characteristics are suitable for strong electromagnetic interference environment.

[0037] ③ In the outer rotor form, bolts are used to tighten the pressure strips to fix the pole permanent magnets and the inter-pole magnetizing permanent magnets. The pole permanent magnets are integrated permanent magnets.

[0038] Among them, the bolt-on type pressure strip is flexible to assemble, easy to disassemble and maintain, easy to adjust (control the contact pressure through the bolt pre-tightening force to reduce the risk of loosening), and has wide adaptability (suitable for installation of various sizes).

[0039] The magnetic pole permanent magnet is an integrated structure, which fits the cylindrical rotor bracket better. The integrated structure has good rigidity, simple manufacturing and processing, and can be directly formed.

[0040] The applicable working conditions of the above-mentioned motor rotor are: low-speed and high-torque scenarios, such as direct-drive wind turbines. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 Schematic diagram of the motor rotor and generator in the form of an inner rotor with a pole shoe structure and bolt fixation; Figure 2 for Figure 1 A schematic cross-sectional view of a motor rotor and a generator; Figure 3 for Figure 1 A partial schematic diagram of the motor rotor and generator using split-type inter-pole magnetic concentrating permanent magnets; Figure 4 for Figure 3 Schematic diagram of the inter-pole position in ; Figure 5 for Figure 3 Schematic diagram of the split-type inter-pole magnetic field concentrating permanent magnet; Figure 6 Schematic diagram of layering strips; Figure 7 for Figure 1 A partial schematic diagram of the motor rotor and generator using an integrated inter-pole magnetic permanent magnet; Figure 8 for Figure 7 Schematic diagram of the inter-pole position in ; Figure 9 for Figure 7 Schematic diagram of the integrated inter-pole magnetic field concentrating permanent magnet; Figure 10 Schematic diagram of the motor rotor and generator in the form of an inner rotor and fixed with a collar; Figure 11 for Figure 10 Schematic diagram of the rotor bracket in; Figure 12 for Figure 10 A partial schematic diagram of the motor rotor and generator using split-type inter-pole magnetic concentrating permanent magnets; Figure 13 for Figure 10 Schematic diagram of an integrated arc-shaped magnetic pole permanent magnet; Figure 14 for Figure 12Schematic diagram of the split-type inter-pole magnetic field concentrating permanent magnet; Figure 15 for Figure 10 A partial schematic diagram of the motor rotor and generator using an integrated inter-pole magnetic permanent magnet; Figure 16 for Figure 15 Schematic diagram of the integrated inter-pole magnetic field concentrating permanent magnet; Figure 17 Schematic diagram of the motor rotor and generator in the form of an outer rotor; Figure 18 for Figure 17 A partial schematic diagram of the motor rotor and generator using an integrated inter-pole magnetic permanent magnet; Figure 19 for Figure 17 Schematic diagram of the magnetic pole permanent magnet in ; Figure 20 for Figure 18 The array mode of the magnetic pole permanent magnets on the rotor bracket; Figure 21 for Figure 17 A partial schematic diagram of the motor rotor and generator using split-type inter-pole magnetic concentrating permanent magnets; Reference numerals: 1. Rotor bracket; 2. Pole permanent magnet; 21. First type of pole permanent magnet; 22. Second type of pole permanent magnet; 3. Bead; 4. Interpole magnet; 41. First type of interpole magnet; 42. Second type of interpole magnet; 43. Third type of interpole magnet; 44. Fourth type of interpole magnet; 45. Fifth type of interpole magnet; 46. Sixth type of interpole magnet; 5. Baffle; 6. Pole shoe structure; 7. Stud; 8. First bead bolt; 9. Collar; 10. Second bead bolt; 11. Stator core. DETAILED DESCRIPTION

[0042] The following will provide a clear and complete description of the concept, specific structure and technical effects of the present invention in conjunction with the embodiments and drawings, so as to fully understand the purpose, features and effects of the present invention.

[0043] A motor rotor, such as Figure 1 、 Figure 10 、 Figure 17 As shown, it includes a rotor bracket 1, and a plurality of magnetic pole units are evenly assembled on the side wall of the rotor bracket 1 along the circumferential direction, and an interpolar gap is left between two adjacent magnetic pole units; like Figure 3 、 Figure 7 、 Figure 12 、 Figure 15 、 Figure 18 、 Figure 21As shown, each magnetic pole unit includes a magnetic pole permanent magnet 2 attached to the side wall of the rotor bracket 1, and a pressure strip 3 and an inter-pole magnetic focusing permanent magnet 4 are installed at the inter-pole gap. The inter-pole magnetic focusing permanent magnet 4 is attached to the side wall of the rotor bracket 1 and the left and right ends are against the magnetic pole permanent magnet 2. The pressure strip 3 is assembled on the inter-pole magnetic focusing permanent magnet 4 and fixed by a fixing piece. The pressure strip 3 and the fixing piece press the magnetic pole permanent magnet 2 and the inter-pole magnetic focusing permanent magnet 4 to the side wall of the rotor bracket 1.

[0044] In this embodiment, the rotor bracket 1 is used to mount the magnetic pole units; the pole permanent magnets 2 and the interpole focusing permanent magnets 4 can be made of magnetic steel and are fastened to generate work in the main magnetic circuit; the pressure strips 3 are used to secure the pole permanent magnets 2 and the interpole focusing permanent magnets 4; and the fixings are used to secure the pressure strips 3. In this embodiment, the pressure strips 3 and the fixings are used to compress and secure the pole permanent magnets 2 and the interpole focusing permanent magnets 4 to the sidewalls of the rotor bracket 1. This results in a relatively simple structure, involves simple processes, and has a short installation period.

[0045] like Figure 1 、 Figure 10 As shown, the motor rotor is in the form of an inner rotor, and the pressure strip 3 and the fixing parts press and fix the pole permanent magnets 2 and the inter-pole magnetic focusing permanent magnets 4 on the outer wall of the rotor bracket 1. A plurality of baffles 5 are assembled on both axial sides of the rotor bracket 1 by bolts. The pole permanent magnets 2, the pressure strip 3, and the inter-pole magnetic focusing permanent magnets 4 are all located between the two axial baffles 5, and the baffles 5 are used to limit them.

[0046] like Figure 3 、 Figure 4 、 Figure 7 、 Figure 8 As shown, the rotor bracket 1 is a structure with an outer polygon and an inner circle. A magnetic pole unit is set on each side of the outer polygon. Multiple permanent magnets in each magnetic pole unit are closely connected in a straight line and the inner end is in contact with the outer wall of the rotor bracket 1. A pole shoe structure 6 is set at the outer end. The left and right ends of the pole shoe structure 6 are against the pressure strip 3 of the interpolar gap and are pressed by the pressure strip 3. The pole shoe structure 6 is composed of multiple pole shoe punchings and is provided with an axial tightening hole. The stud 7 passes through the axial tightening hole and the front and rear ends are fixed to the baffle 5 by nuts. Figure 2 shown.

[0047] This inline permanent magnet rotor features a simple process, easy processing and assembly, resulting in low cost. It can also be easily divided into smaller pieces (dividing into smaller pieces shortens the magnetic flux leakage path, and with less travel, less energy is consumed), thus reducing magnetic flux leakage. Furthermore, the baffle 5 is bolted to the rotor bracket 1, and the pole shoe structure 6 is secured to the baffle 5 using studs 7. The baffle 5 then secures the pole shoe structure 6 to the rotor bracket 1, thereby securing the pole permanent magnets 2 to the rotor bracket 1.

[0048] like Figure 4and Figure 8 As shown, the fixing part is a first pressure strip bolt 8. A plurality of first bolt counterbores are provided on the side wall of the rotor bracket 1, a plurality of first screw holes are provided on the pressure strip 3, and a plurality of first tightening circular holes are provided on the inter-pole magnetic permanent magnet 4. The first pressure strip bolt 8 passes through the first bolt counterbores and the first tightening circular hole and is threadedly assembled on the first screw hole. That is, the pressure strip 3 is assembled and fixed to the rotor bracket 1 using the first pressure strip bolt 8, thereby fixing the inter-pole magnetic permanent magnet 4 on the inner side of the pressure strip 3. At the same time, the pressure strip 3 is used to fix the pole shoe structure 6, and then the pole shoe structure 6 is used to fix the pole permanent magnet 2. The bolt-assembled pressure strip is flexible to assemble, easy to disassemble and maintain, easy to adjust (the contact pressure is controlled by the bolt preload to reduce the risk of loosening), and has wide adaptability (suitable for installations of various sizes).

[0049] like Figure 3 and Figure 7 As shown, the pole shoe structure 6 is trapezoidal or arcuate. When the arcuate shape is adopted, the outer diameter of the arcuate arc is concentric or eccentric with the rotor bracket 1. The pole shoe structure 6 is made of high magnetic permeability punching sheets with a thickness of 0.3mm~1.5mm by lamination.

[0050] In this embodiment, the number of sides of the outer polygon of the rotor support 1 is a, and a≥4; in each magnetic pole unit, the number of the magnetic pole permanent magnets 2 is b, and 3≤b≤15; Multiple permanent magnets 2 are regularly distributed circumferentially and axially around the rotor support 1. Specifically, they are evenly distributed circumferentially along the circumference of the rotor support 1 and evenly aligned axially. This arrangement of permanent magnets results in a more uniform magnetic field. This uniform circumferential distribution ensures a near-sinusoidal air gap flux density, reducing harmonics and thus lowering motor torque ripple and noise, thereby improving motor stability. Axial alignment reduces circumferential unbalanced magnetic pull and evenly distributes centrifugal force.

[0051] like Figure 4 、 Figure 8 As shown, a fastening gap is reserved between the inter-pole magnetizing permanent magnet 4 and the rotor bracket 1, the fastening gap thickness is 0.5mm~3mm, and the fastening gap is filled with flexible material. The purpose of setting the fastening gap is to facilitate the pre-tightening of the pressure strip 3, and the pressure strip 3 drives the inter-pole magnetizing permanent magnet 4 to move to the fastening gap for fixation. The purpose of filling the fastening gap with flexible material is to make the inter-pole magnetizing permanent magnet 4 firmly attached to the inner wall of the rotor bracket. Because permanent magnets have the characteristics of being resistant to tension but not to compression, if the flexible material is not filled and the bolts are pre-tightened, the permanent magnet may be directly broken.

[0052] The inter-pole magnetizing permanent magnet 4 is a bonded permanent magnet, and the inter-pole magnetizing permanent magnet 4 is a split type or an integrated type. Figure 5 、 Figure 9 、 Figure 14 and Figure 16The magnetization angle of the split-pole permanent magnet 4 is 0°-60°, and the magnetization angle of the integrated interpole permanent magnet 4 is 90°, as shown. Figure 3 、 Figure 4 、 Figure 7 、 Figure 8 、 Figure 12 、 Figure 15 、 Figure 18 、 Figure 21 Specifically, the split-type inter-pole magnet 4 includes a first type of inter-pole magnet 41, a third type of inter-pole magnet 43, and a sixth type of inter-pole magnet 46, which are respectively suitable for Figure 1 、 Figure 10 、 Figure 17 The integrated interpole magnet 4 includes a second type of interpole magnet 42, a fourth type of interpole magnet 44, and a fifth type of interpole magnet 45, which are respectively suitable for Figure 1 、 Figure 10 、 Figure 17 The form of motor rotor and generator.

[0053] The use of a split-type interpole magnet 4 offers the advantage of allowing magnetization according to the desired flux linkage direction and angle, creating a multi-directional and multi-angle combination, significantly increasing the air gap flux density. However, the split-type structure results in low mechanical strength and requires separate magnetization, resulting in higher costs. The split-type interpole magnet 4 is suitable for applications requiring high dynamic response and high torque density.

[0054] The use of an integrated interpole permanent magnet 4 offers advantages such as simple manufacturing, high mechanical strength, reduced installation steps such as positioning, and low cost. However, the magnetic field uniformity is poor, and magnetization can only be performed in a single direction and at a single angle. The integrated interpole permanent magnet 4 is suitable for applications with high rotational speeds and low requirements for magnetic field concentration.

[0055] like Figure 6 As shown, the pressure strip 3 is dove-tail shaped, which compresses the pole shoe structure 6 or the pole permanent magnet 2 while compressing the inter-pole magnetic permanent magnet 4; the inter-pole magnetic permanent magnet 4 is trapezoidal, and fixes the pole permanent magnet 2 while being compressed; the rotor bracket 1 is made of high magnetic permeability steel, and the pressure strip 3 is made of weak magnetic or non-magnetic material.

[0056] like Figure 10 、 Figure 11 As shown, the rotor bracket 1 is a circular barrel structure, and a plurality of axial through-type notches are provided on the outer circumference of the rotor bracket 1. The magnetic pole permanent magnet 2 is an integrated arc structure, and a protrusion is provided on the inner arc surface along the axial direction, as shown in FIG. Figure 13As shown, the pole permanent magnet 2 is a first type pole permanent magnet 21, and the protrusion is assembled on the through-type notch. The protrusion and the through-type notch cooperate to limit the pole permanent magnet 2 on the outer circumferential surface of the rotor bracket 1.

[0057] like Figure 12 、 Figure 15 As shown, the fixing member is a collar 9, which is sleeved on the outside of the pole permanent magnet 2 and the pressure strip 3. The protrusion and the through-type notch limit the circumferential movement of the pole permanent magnet 2, and then the collar 9 is sleeved on the pole permanent magnet 2 to radially limit the pole permanent magnet 2 and fix the pole permanent magnet 2. At the same time, the circumferential movement of the pressure strip 3 is blocked by the pole permanent magnet 2, thereby limiting the circumferential movement of the pressure strip 3. At the same time, the collar 9 is sleeved on the pressure strip 3 to radially limit the pressure strip 3. In addition, the axial baffle 5 limits the axial movement of the pole permanent magnet 2 and the pressure strip 3. Therefore, the pole permanent magnet 2 and the pressure strip 3 of this embodiment are limited circumferentially, radially and axially, thereby fixing the pole permanent magnet 2 and the pressure strip 3.

[0058] like Figure 12 、 Figure 15 As shown, the pole permanent magnet 2 is a bonded permanent magnet, and the inner arc radius of the pole permanent magnet 2 is equal to the outer circle radius of the rotor bracket 1, so that it can fit on the outer circle of the rotor bracket 1. The protrusion of the pole permanent magnet 2 is consistent with the shape of the through-type notch of the rotor bracket 1, so as to facilitate circumferential limitation of the pole permanent magnet 2.

[0059] like Figure 12 、 Figure 15 As shown, the collar 9 is a hollow circular tube with a thickness of 2 to 6 cm. The inner radius of the collar 9 is equal to the outer radius of the arc-shaped permanent magnet 2 and the outer radius of the bead 3. The collar 9 is made of a weakly magnetic or non-magnetic material (primarily carbon fiber winding). In this embodiment, the collar 9 design significantly reduces rotor weight, improves specific strength, reduces moment of inertia, and improves motor response speed. Furthermore, the outer layer is fixed in a collar form to withstand high-speed centrifugal forces. Similarly, the fibers reduce eddy current losses. The collar's smooth surface reduces wind friction losses.

[0060] like Figure 17 As shown, the motor rotor is in the form of an outer rotor. The pressure strip 3 and the fixing piece press and fix the pole permanent magnets 2 and the inter-pole magnetic concentrating permanent magnets 4 on the inner wall of the rotor bracket 1. The rotor bracket 1 is barrel-shaped.

[0061] like Figure 18 、 Figure 21As shown, the fixing part is a second pressure strip bolt 10, a plurality of second bolt counterbores are provided on the side wall of the rotor bracket 1, a plurality of second screw holes are provided on the pressure strip 3, a plurality of second tightening circular holes are provided on the inter-pole magnetic permanent magnet 4, and the second pressure strip bolt 10 passes through the second screw holes, the second tightening circular holes and is threadedly assembled on the second bolt counterbores. That is, the pressure strip 3 is assembled and fixed to the rotor bracket 1 using the second pressure strip bolt 10, thereby fixing the inter-pole magnetic permanent magnet 4 on the inner side of the pressure strip 3, and at the same time, the magnetic pole permanent magnet 2 is fixed using the pressure strip 3. The bolt-assembled pressure strip is flexible to assemble, easy to disassemble and maintain, easy to adjust (controlling contact pressure by bolt preload to reduce the risk of loosening), and has wide adaptability (suitable for installations of various sizes).

[0062] like Figure 19 As shown, the pole permanent magnet 2 is a second type of pole permanent magnet 22. The pole permanent magnet 2 is a bonded integral permanent magnet. When installed on the inner circle of the rotor bracket 1, it is arranged at an axial oblique angle, which is equivalent to using oblique poles. Oblique poles can reduce the cogging torque, suppress torque pulsation, improve the stability of the motor, and thus reduce electromagnetic noise and vibration. And it can improve the back electromotive force waveform, making it closer to a sine wave. The pole permanent magnet 2 is arc-shaped, and there are inclined surfaces on both sides of the arc inner circle for the pressure strip 3 to be embedded, so that the pressure strip 3 can apply a pre-tightening force to it for compaction. The outer arc radius of the arc-shaped pole permanent magnet 2 is equal to the inner circle radius of the rotor bracket 1, so that the pole permanent magnet 2 can be attached to the inner circle of the rotor bracket 1. The array method of the pole permanent magnet on the rotor bracket is as follows. Figure 20 shown.

[0063] A generator includes a motor rotor and a stator core 11; like Figure 1 and Figure 10 As shown, when the motor rotor is an inner rotor, the motor rotor is inserted into the stator core 11; like Figure 17 As shown, when the motor rotor is an outer rotor, the stator core 11 is inserted into the motor rotor.

[0064] In this embodiment, the inner rotor generator has permanent magnets located inside the stator, and the stator windings are fixed to the outer casing. The stator windings directly contact the outer casing, enabling efficient heat dissipation via external heat sinks or a liquid cooling system. Heat from the rotor is transferred to the stator through the air gap, making it suitable for high-power density applications. The small rotor diameter and low centrifugal forces under the same conditions make it suitable for high-speed operation, easy maintenance, and precision control scenarios requiring high dynamic response.

[0065] In an external rotor generator, the permanent magnets are fixed to the outer rotating housing, while the stator windings are fixed to the inner central shaft. The rotor directly serves as a support structure for the mechanical load. The mass of the external rotor is distributed at the outer edge, resulting in a large moment of inertia, which can smooth torque fluctuations. The large rotor radius significantly increases torque for the same electromagnetic force, making it suitable for low-speed, high-torque scenarios.

[0066] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without departing from the spirit of the present invention. These equivalents or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A motor rotor, characterized in that: It comprises a rotor support (1), wherein a plurality of magnetic pole units are evenly arranged on a side wall of the rotor support (1) along the circumferential direction, and an interpolar gap is left between two adjacent magnetic pole units; Each magnetic pole unit includes a magnetic pole permanent magnet (2) attached to the side wall of the rotor bracket (1), a pressure strip (3) and an inter-pole magnetizing permanent magnet (4) are installed at the inter-pole gap, the inter-pole magnetizing permanent magnet (4) is attached to the side wall of the rotor bracket (1) and the left and right ends of the inter-pole magnetizing permanent magnet (4) are against the magnetic pole permanent magnet (2), the pressure strip (3) is installed on the inter-pole magnetizing permanent magnet (4) and is fixed by a fixing piece, and the pressure strip (3) and the fixing piece press the magnetic pole permanent magnet (2) and the inter-pole magnetizing permanent magnet (4) to the side wall of the rotor bracket (1).

2. A motor rotor according to claim 1, characterized in that: The motor rotor is in the form of an inner rotor, and the pressure strip (3) and the fixing member press and fix the magnetic pole permanent magnet (2) and the inter-pole magnetic focusing permanent magnet (4) on the outer wall of the rotor bracket (1). The rotor bracket (1) is equipped with a plurality of baffles (5) on both axial sides by bolts, and the magnetic pole permanent magnet (2), the pressure strip (3), and the inter-pole magnetic focusing permanent magnet (4) are all located between the two axial baffles (5).

3. A motor rotor according to claim 2, characterized in that: The rotor bracket (1) is a structure with an outer polygon and an inner circle. A magnetic pole unit is provided on each face of the outer polygon. A plurality of permanent magnets in each magnetic pole unit are closely arranged in a straight line and the inner end is in contact with the outer wall of the rotor bracket (1). A pole shoe structure (6) is provided at the outer end. The left and right ends of the pole shoe structure (6) are against the pressure strip (3) of the interpolar gap and are pressed by the pressure strip (3). The pole shoe structure (6) is composed of a plurality of pole shoe punchings and is provided with an axial tightening hole. A stud (7) passes through the axial tightening hole and the front and rear ends are fixed to the baffle (5) by nuts.

4. A motor rotor according to claim 3, characterized in that: The fixing member is a first pressure strip bolt (8), a plurality of first bolt countersunk holes are provided on the side wall of the rotor bracket (1), a plurality of first screw holes are provided on the pressure strip (3), a plurality of first tightening circular holes are provided on the inter-pole magnetic permanent magnet (4), and the first pressure strip bolt (8) passes through the first bolt countersunk hole and the first tightening circular hole and is threadedly assembled on the first screw hole.

5. The motor rotor according to claim 3, characterized in that: The pole shoe structure (6) is trapezoidal or arcuate in shape. When the arcuate shape is adopted, the outer diameter of the arcuate arc is concentric or eccentric with the rotor bracket (1). The pole shoe structure (6) is made by laminating high-magnetic permeability punching sheets with a thickness of 0.3 mm to 1.5 mm.

6. The motor rotor according to claim 3, characterized in that: The number of sides of the outer polygon of the rotor support (1) is a, a≥4; in each magnetic pole unit, the number of the magnetic pole permanent magnets (2) is b, 3≤b≤15; The plurality of magnetic pole permanent magnets (2) are regularly distributed in the circumferential and axial directions of the rotor support (1), specifically: they are evenly distributed along the circumference of the rotor support (1) in the circumferential direction, and are aligned and evenly distributed along a straight line in the axial direction.

7. The motor rotor according to claim 1, characterized in that: A fastening gap is reserved between the inter-pole magnetic concentrating permanent magnet (4) and the rotor bracket (1), the fastening gap has a thickness of 0.5 mm to 3 mm, and the fastening gap is filled with a flexible material.

8. The motor rotor according to claim 1, characterized in that: The inter-pole magnetizing permanent magnet (4) is a bonded permanent magnet. The inter-pole magnetizing permanent magnet (4) is a split-type or integrated type. The magnetization angle of the split-type inter-pole magnetizing permanent magnet (4) is 0°-60°, and the magnetization angle of the integrated inter-pole magnetizing permanent magnet (4) is 90°.

9. The motor rotor according to claim 1, characterized in that: The pressure strip (3) is dove-tail shaped, and the inter-pole magnetic permanent magnet (4) is trapezoidal; the rotor bracket (1) is made of high-magnetic-conductivity steel, and the pressure strip (3) is made of weak-magnetic or non-magnetic-conductivity material.

10. The motor rotor according to claim 2, characterized in that: The rotor support (1) is a circular barrel-shaped structure, and a plurality of axial through-type notches are provided on the outer circumferential surface of the rotor support (1). The magnetic pole permanent magnet (2) is an integrated arc-shaped structure, and a protrusion is provided on the inner arc surface along the axial direction, and the protrusion is assembled on the through-type notches.

11. The motor rotor according to claim 10, characterized in that: The fixing member is a collar (9), and the collar (9) is sleeved on the outside of the pole permanent magnet (2) and the pressure strip (3).

12. The motor rotor according to claim 10, characterized in that: The magnetic pole permanent magnet (2) is a bonded permanent magnet, the inner arc radius of the magnetic pole permanent magnet (2) is equal to the outer circle radius of the rotor bracket (1), and the protrusion of the magnetic pole permanent magnet (2) is consistent in shape with the through-type notch of the rotor bracket (1).

13. The motor rotor according to claim 11, characterized in that: The collar (9) is in the shape of a hollow circular tube with a thickness of 2 to 6 cm. The inner radius of the collar (9) is equal to the outer radius of the arc-shaped magnetic pole permanent magnet (2) and the outer radius of the pressure strip (3). The collar (9) is made of weak magnetic or non-magnetic material.

14. The motor rotor according to claim 1, characterized in that: The motor rotor is in the form of an outer rotor, and the pressure strip (3) and the fixing piece press and fix the magnetic pole permanent magnet (2) and the inter-pole magnetic permanent magnet (4) on the inner wall of the rotor bracket (1), and the rotor bracket (1) is barrel-shaped.

15. The motor rotor according to claim 14, characterized in that: The fixing member is a second pressure strip bolt (10), a plurality of second bolt countersunk holes are provided on the side wall of the rotor bracket (1), a plurality of second screw holes are provided on the pressure strip (3), a plurality of second tightening circular holes are provided on the inter-pole magnetic permanent magnet (4), and the second pressure strip bolt (10) passes through the second screw hole and the second tightening circular hole and is threadedly assembled on the second bolt countersunk hole.

16. The motor rotor according to claim 14, characterized in that: The magnetic pole permanent magnet (2) is a bonded integral permanent magnet, and is arranged at an axial oblique angle when mounted on the inner circle of the rotor bracket (1). The magnetic pole permanent magnet (2) is arc-shaped, and has inclined surfaces on both sides of the arc-shaped inner circle for embedding the pressure strip (3). The outer arc radius of the arc-shaped magnetic pole permanent magnet (2) is equal to the inner circle radius of the rotor bracket (1).

17. A generator based on the motor rotor according to any one of claims 1 to 16, characterized in that: including a motor rotor and a stator core (11); When the motor rotor is an inner rotor, the motor rotor is inserted into the stator core (11); When the motor rotor is an outer rotor, the stator core (11) is inserted into the motor rotor.

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