A motor rotor and a generator

Abstract

The application discloses a motor rotor and a generator, and relates to the technical field of motors, which comprises a rotor support, a plurality of magnetic pole units are uniformly arranged on the side wall of the rotor support in the circumferential direction, and an inter-pole gap is left between 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 magnetic concentration permanent magnet are arranged at the inter-pole gap, the inter-pole magnetic concentration permanent magnet is attached to the side wall of the rotor support and abuts against the magnetic pole permanent magnet at the left and right ends, the pressing strip is arranged on the inter-pole magnetic concentration permanent magnet and is fixed by a fixing member, and the magnetic pole permanent magnet and the inter-pole magnetic concentration permanent magnet are tightly fixed on the side wall of the rotor support by the pressing strip and the fixing member. The motor rotor provided by the application has obvious magnetic concentration effect, has an air gap magnetic field which is closer to a sine distribution, and due to the existence of the inter-pole magnetic concentration permanent magnet, the inter-pole gap is filled, the rotor surface is smoother, and the wind friction loss is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the motor technical field, more particularly to a motor rotor and a generator. BACKGROUND

[0002] At present, the mainstream wind power generator can be divided into permanent magnet direct drive, permanent magnet half direct drive, double-fed, high-speed permanent magnet, and the permanent magnet wind power generator has low speed, only about 10r / min, and is favored by the market due to simple structure, no gear box and other vulnerable parts.

[0003] The existing permanent magnet wind power generator includes two forms of inner rotor and outer rotor. The inner rotor refers to that the rotor is located in the stator core, and the permanent magnet is installed on the rotor support inside. The outer rotor refers to that the rotor is located outside the stator core, and the permanent magnet is installed on the rotor support outside.

[0004] For the inner rotor form, the magnetic steel is mainly embedded in the magnetic pole box, and a plurality of magnetic pole boxes are combined on the rotor support through a large number of bolts, but the number of bolts is large, the installation operation amount is large, the installation period is long, the process steps are complicated, the production cost is increased, and the batch production of the product is not conducive.

[0005] For the outer rotor form, the permanent magnet can only be embedded in the magnetic steel frame and fixed on the rotor base through the bolts. The technical structure is relatively complex, involves complicated process procedures, and has a long installation period. In addition, due to the existence of the magnetic steel frame, the space utilization rate is low, the magnetic yoke thickness is large, and the whole machine weight is increased.

[0006] Therefore, how to further optimize and iterate the rotor, permanent magnet and the like of the permanent magnet direct drive has become a key difficulty recognized by the industry. The rectangular magnetic aggregation permanent magnet rotor array structure (a permanent magnet arrangement mode combining radial and tangential permanent magnets together, the purpose is to generate the strongest magnetic field with the least number of magnets) is one of the important paths to solve the current permanent magnet direct drive technology. SUMMARY

[0007] In order to overcome the defects existing in the prior art, the present application discloses a motor rotor and a generator, and the purpose of the present application is to solve the problems of long installation period and complicated process steps existing in the prior art.

[0008] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0009] A motor rotor, comprising a rotor support, a plurality of magnetic pole units are uniformly arranged on the side wall of the rotor support in the circumferential direction, and an inter-pole gap is left between adjacent two magnetic pole units.

[0010] 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 magnetic concentration permanent magnet are arranged at the inter-pole gap, the inter-pole magnetic concentration permanent magnet is attached to the side wall of the rotor support and abuts against the magnetic pole permanent magnet at the left and right ends, the pressing strip is arranged on the inter-pole magnetic concentration permanent magnet and is fixed by a fixing member, and the pressing strip and the fixing member press and fix the magnetic pole permanent magnet and the inter-pole magnetic concentration permanent magnet on the side wall of the rotor support.

[0011] Preferably, the motor rotor is in the form of an inner rotor, the pressing strip and the fixing member press and fix the magnetic pole permanent magnet and the inter-pole magnetic concentration permanent magnet on the outer side wall of the rotor support, and the axial two sides of the rotor support are provided with a plurality of baffle plates through bolt assembly.

[0012] Preferably, the rotor support is in the form of an outer polygonal and inner circular structure, one magnetic pole unit is arranged on each side of the outer polygonal, and a plurality of permanent magnets in each magnetic pole unit are arranged in a linear type and abut against the outer wall of the rotor support at the inner ends, and a shoe structure is arranged at the outer ends, the shoe structure abuts against and is pressed by the pressing strip at the left and right ends, the shoe structure is composed of a plurality of shoe pieces and is provided with an axial tension hole, a stud passes through the axial tension hole and is fixed on the baffle plate through nuts at the front and rear ends.

[0013] Preferably, the fixing member is a first pressing strip bolt, a plurality of first bolt counterbores are arranged on the side wall of the rotor support, a plurality of first screw holes are arranged on the pressing strip, and a plurality of first tension round holes are arranged on the inter-pole magnetic concentration permanent magnet, the first pressing strip bolt passes through the first bolt counterbores and the first tension round holes and is screw assembled on the first screw holes.

[0014] Preferably, the shoe structure is in the form of a trapezoid or an arc, when the shoe structure is in the form of an arc, the outer diameter of the arc is concentric or eccentric with the rotor support, and the shoe structure is made by laminating the high-permeability pieces with a thickness of 0.3mm-1.5mm.

[0015] Preferably, the number of sides of the outer polygon of the rotor support is a, and a≥4; in each magnetic pole unit, the number of magnetic pole permanent magnets is b, and 3≤b≤15.

[0016] The plurality of magnetic pole permanent magnets are regularly distributed in the circumferential direction and the axial direction of the rotor support, specifically, the plurality of magnetic pole permanent magnets are uniformly distributed along the circumference of the rotor support in the circumferential direction and are aligned and uniformly distributed along a straight line in the axial direction.

[0017] Preferably, a fastening gap is reserved between the inter-pole magnetic concentration permanent magnet and the rotor support, the thickness of the fastening gap is 0.5mm-3mm, and the fastening gap is filled with a flexible material.

[0018] Preferably, the inter-pole magnetic concentration permanent magnet is a bonded permanent magnet, and the inter-pole magnetic concentration permanent magnet is a split type or an integrated type, the magnetization angle of the split type inter-pole magnetic concentration permanent magnet is 0°-60°, and the magnetization angle of the integrated type inter-pole magnetic concentration permanent magnet is 90°.

[0019] Preferably, the pressing strip is in a dovetail shape, the inter-pole magnetic concentration permanent magnet is in a trapezoidal shape, the rotor support is made of high-permeability steel material, and the pressing strip is made of weak magnetic or non-permeable material.

[0020] Preferably, the rotor support is in a circular barrel shape, a plurality of axial through-type notches are arranged on the outer circular surface of the rotor support, the magnetic pole permanent magnet is in an integrated arc shape, and a protruding portion is arranged on the inner arc surface of the magnetic pole permanent magnet in the axial direction, and the protruding portion is fitted on the through-type notch.

[0021] Preferably, the fixing member is a sleeve ring, and the sleeve ring is sleeved on the outer side of the magnetic pole permanent magnet and the pressing strip.

[0022] Preferably, the magnetic pole permanent magnet is a bonded permanent magnet, the inner arc radius of the magnetic pole permanent magnet is equal to the outer circular radius of the rotor support, and the protruding portion of the magnetic pole permanent magnet is consistent with the shape of the through-type notch of the rotor support.

[0023] Preferably, the sleeve ring is in a hollow circular tube shape, the thickness is 2-6 cm, the inner circular radius of the sleeve ring is equal to the outer circular radius of the arc-shaped magnetic pole permanent magnet and the outer circular radius of the pressing strip, and the sleeve ring is made of weak magnetic or non-permeable material.

[0024] Preferably, the motor rotor is in an outer rotor form, the pressing strip and the fixing member press and fix the magnetic pole permanent magnet and the inter-pole magnetic concentration permanent magnet on the inner side wall of the rotor support, and the rotor support is in a barrel shape.

[0025] Preferably, the fixing member is a second pressing strip bolt, a plurality of second bolt counterbores are arranged on the side wall of the rotor support, a plurality of second screw holes are arranged on the pressing strip, a plurality of second tension round holes are arranged on the inter-pole magnetic concentration permanent magnet, and the second pressing strip bolt is screwed and fitted on the second bolt counterbores through the second screw holes and the second tension round holes.

[0026] Preferably, the magnetic pole permanent magnet is a bonded integrated permanent magnet, and is arranged in an axial inclined angle when being installed on the inner circle of the rotor support, the magnetic pole permanent magnet is in an arc shape, and an inclined surface for embedding the pressing strip is arranged on both sides of the arc-shaped inner circle, and the outer arc radius of the arc-shaped magnetic pole permanent magnet is equal to the inner circular radius of the rotor support.

[0027] Based on the motor rotor, the application further provides a generator comprising the motor rotor and a stator core.

[0028] When the motor rotor is an inner rotor, the motor rotor is inserted into the stator core.

[0029] When the motor rotor is an outer rotor, the stator core is inserted into the motor rotor.

[0030] Advantages of the present application:

[0031] The motor rotor provided by the present application is provided with a pressing strip and an inter-pole magnetic-concentration permanent magnet at the inter-pole gap for the inner rotor type, the inter-pole magnetic-concentration permanent magnet is attached to the side wall of the rotor support and abuts against the magnetic-pole permanent magnet at the left and right ends, the pressing strip is assembled on the inter-pole magnetic-concentration permanent magnet and is fixed by a fixing member, and the pressing strip and the fixing member tightly fix the magnetic-pole permanent magnet and the inter-pole magnetic-concentration permanent magnet on the side wall of the rotor support. The fixing member can be a bolt or a collar, when it is a bolt, a pole shoe structure is configured, and when it is a collar, a protruding part and a through-type notch are configured. Compared with the prior art that the magnetic steel is embedded in the magnetic-pole box and the magnetic-pole box is clamped on the rotor support by a large number of bolts, the present application uses the pressing strip and the fixing member, the number of required bolts is relatively small, the installation workload is relatively small, the installation period is relatively short, the process is relatively simple, the production cost is relatively low, and thus the batch production of the product is facilitated.

[0032] The motor rotor provided by the present application is provided with a pressing strip and an inter-pole magnetic-concentration permanent magnet at the inter-pole gap for the outer rotor type, the inter-pole magnetic-concentration permanent magnet is attached to the side wall of the rotor support and abuts against the magnetic-pole permanent magnet at the left and right ends, the pressing strip is assembled on the inter-pole magnetic-concentration permanent magnet and is fixed by a fixing member, and the pressing strip and the fixing member tightly fix the magnetic-pole permanent magnet and the inter-pole magnetic-concentration permanent magnet on the side wall of the rotor support. The fixing member is a bolt. Compared with the prior art that the permanent magnet can only be fixed on the rotor base by a bolt in the form of embedding in a magnetic steel frame, the present application uses the pressing strip and the fixing member, fixes the pressing strip by the fixing member, and then fixes the magnetic-pole permanent magnet and the inter-pole magnetic-concentration permanent magnet by the pressing strip, so that the structure is relatively simple, the process procedure involved is simple, and the installation period is short. In addition, there is no magnetic steel frame, and thus the space utilization is improved.

[0033] The motor rotor provided by the present application has obvious magnetic-concentration effect, has an air-gap magnetic field closer to a sine distribution, has a larger air-gap magnetic density and a smaller iron loss under the condition that the amount of the permanent magnet material is the same, reduces the thickness of the magnetic yoke, reduces the weight of the rotor, improves the power density, and due to the existence of the magnetic-concentration permanent magnet, fills the inter-pole vacancy, makes the surface of the rotor smoother, and reduces the wind friction loss.

[0034] The motor rotor provided by the application is provided with inter-pole magnetic concentration permanent magnets at the inter-pole gap, which is pressed by the pressing strip on one hand, and the left and right ends of the inter-pole magnetic concentration permanent magnets abut against the pole permanent magnets, so that the inter-pole magnetic concentration permanent magnets are fixed while exerting force on the pole permanent magnets at the left and right ends to assist in fixing the pole permanent magnets. On the other hand, the existence of the inter-pole magnetic concentration permanent magnets fills the vacancy between the poles, so that the surface of the rotor is smoother and the wind friction loss is reduced. In addition, the use of the inter-pole magnetic concentration permanent magnets can enhance the unilateral magnetic chain, reduce the wall thickness of the rotor support, increase the air gap magnetic density, reduce the weight and reduce the rotor eddy current loss.

[0035] The motor rotor provided by the application has the following forms:

[0036] ① The inner rotor form uses the bolted pressing strip and the pole shoe structure to fix the pole permanent magnets and the inter-pole magnetic concentration permanent magnets, and the pole permanent magnets are a plurality of permanent magnets in a linear type.

[0037] Among them, the bolted pressing strip is flexible in assembly, convenient to disassemble and maintain, easy to adjust (the contact pressure is controlled by the bolt pre-tightening force, and the risk of loosening is reduced), and has wide adaptability (it is suitable for installation of various sizes). The pole shoe structure is used to fix the pole permanent magnets, and the pole shoe structure is composed of a plurality of punching sheets with a certain thickness. While playing a fixing role, it can reduce the eddy current loss of the permanent magnet.

[0038] The pole permanent magnets are a plurality of permanent magnets in a linear type. For this kind of permanent magnet, the process is simple, easy to process and assemble, so the cost is low, and it is easy to be divided into small blocks (divided into small blocks, which is equivalent to a short magnetic leakage path, so the energy consumption is naturally reduced), which also reduces the magnetic leakage.

[0039] The above motor rotor has the following working conditions: the linear structure is simple, easy to manufacture and assemble, and low in cost. The magnetic circuit is symmetrical, the magnetic field distribution is uniform, and it is suitable for high speed, and the performance and torque ripple requirements are not harsh.

[0040] ② The inner rotor form is that the rotor support and the pole permanent magnets are limited by the protruding part and the through-type gap, and at the same time, the sleeve ring is sleeved outside the pole permanent magnets and the pressing strip to fix them, and the pole permanent magnets are an integral arc structure.

[0041] Among them, the rotor support and the pole permanent magnets are limited by the protruding part and the through-type gap, which is convenient for positioning and installation and resisting tangential force. The sleeve ring fixes the pole permanent magnets and the pressing strip, and the sleeve ring is made of weak magnetic or non-magnetic material (mainly carbon fiber), which can significantly reduce the weight of the rotor, has high specific strength, light weight, reduces the moment of inertia, and improves the response speed of the motor. The outer layer is fixed in the form of a sleeve ring and can withstand high-speed centrifugal force. Similarly, the fiber can reduce the eddy current loss. The surface of the sleeve ring is smooth, which reduces the wind friction loss.

[0042] The magnetic pole permanent magnet is an integral arc structure, which is more suitable for the cylindrical rotor support and the collar, has good rigidity and strength, is simple to manufacture and process, and is directly formed.

[0043] The motor rotor is suitable for the working condition of high speed and non-magnetic characteristics suitable for strong electromagnetic interference environment.

[0044] The magnetic pole permanent magnet is an integral arc structure, which is more suitable for the cylindrical rotor support and the collar, has good rigidity and strength, is simple to manufacture and process, and is directly formed.

[0045] The bolted pressing strip assembly is flexible, convenient to disassemble and maintain, easy to adjust (the contact pressure is controlled by the bolt pre-tightening force, the loosening risk is reduced), and has wide adaptability (is suitable for installation of various sizes).

[0046] The magnetic pole permanent magnet is an integral arc structure, which is more suitable for the cylindrical rotor support and the collar, has good rigidity and strength, is simple to manufacture and process, and is directly formed.

[0047] The motor rotor is suitable for the working condition of low speed and large torque scene, such as direct drive wind turbine. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 The motor rotor and the generator are in the form of an inner rotor and adopt a pole shoe structure and bolt fixation;

[0049] Figure 2 The motor rotor and the generator are in the form of an inner rotor and adopt a pole shoe structure and bolt fixation; Figure 1 The cross-sectional view of the motor rotor and the generator in the form of an inner rotor and adopting a pole shoe structure and bolt fixation;

[0050] Figure 3 The motor rotor and the generator in the form of an inner rotor and adopting a pole shoe structure and bolt fixation adopt a split type inter-pole magnetic concentration permanent magnet; Figure 1 The motor rotor and the generator in the form of an inner rotor and adopting a pole shoe structure and bolt fixation adopt a split type inter-pole magnetic concentration permanent magnet;

[0051] Figure 4 The inter-pole position in the form of an inner rotor and adopting a pole shoe structure and bolt fixation; Figure 3 The inter-pole position in the form of an inner rotor and adopting a pole shoe structure and bolt fixation;

[0052] Figure 5 The split type inter-pole magnetic concentration permanent magnet in the form of an inner rotor and adopting a pole shoe structure and bolt fixation; Figure 3 The split type inter-pole magnetic concentration permanent magnet in the form of an inner rotor and adopting a pole shoe structure and bolt fixation;

[0053] Figure 6 The pressing strip;

[0054] Figure 7 The motor rotor and the generator in the form of an inner rotor and adopting a pole shoe structure and bolt fixation adopt an integral type inter-pole magnetic concentration permanent magnet; Figure 1 The motor rotor and the generator in the form of an inner rotor and adopting a pole shoe structure and bolt fixation adopt an integral type inter-pole magnetic concentration permanent magnet;

[0055] Figure 8 The inter-pole position in the form of an inner rotor and adopting a pole shoe structure and bolt fixation; Figure 7 The inter-pole position in the form of an inner rotor and adopting a pole shoe structure and bolt fixation;

[0056] Figure 9Fig. 1 is a schematic diagram of a motor rotor and generator with integral arc-shaped pole permanent magnets in accordance with the present application; Figure 7 Fig. 2 is a schematic diagram of a motor rotor and generator with integral inter-pole permanent magnets in accordance with the present application;

[0057] Figure 10 Fig. 3 is a schematic diagram of a motor rotor and generator with split arc-shaped pole permanent magnets in accordance with the present application;

[0058] Figure 11 Fig. 4 is a schematic diagram of a motor rotor and generator with split inter-pole permanent magnets in accordance with the present application; Figure 10 Fig. 5 is a schematic diagram of a motor rotor and generator with integral arc-shaped pole permanent magnets in accordance with the present application;

[0059] Figure 12 Fig. 6 is a schematic diagram of a motor rotor and generator with split inter-pole permanent magnets in accordance with the present application; Figure 10 Fig. 7 is a schematic diagram of a motor rotor and generator with integral inter-pole permanent magnets in accordance with the present application;

[0060] Figure 13 Fig. 8 is a schematic diagram of a motor rotor and generator with integral arc-shaped pole permanent magnets in accordance with the present application; Figure 10 Fig. 9 is a schematic diagram of a motor rotor and generator with split inter-pole permanent magnets in accordance with the present application;

[0061] Figure 14 Fig. 10 is a schematic diagram of a motor rotor and generator with integral inter-pole permanent magnets in accordance with the present application; Figure 12 Fig. 11 is a schematic diagram of a motor rotor and generator with split arc-shaped pole permanent magnets in accordance with the present application;

[0062] Figure 15 Fig. 12 is a schematic diagram of a motor rotor and generator with integral inter-pole permanent magnets in accordance with the present application; Figure 10 Fig. 13 is a schematic diagram of a motor rotor and generator with integral arc-shaped pole permanent magnets in accordance with the present application;

[0063] Figure 16 Fig. 14 is a schematic diagram of a motor rotor and generator with split inter-pole permanent magnets in accordance with the present application; Figure 15 Fig. 15 is a schematic diagram of a motor rotor and generator with integral arc-shaped pole permanent magnets in accordance with the present application;

[0064] Figure 17 Fig. 16 is a schematic diagram of a motor rotor and generator with split inter-pole permanent magnets in accordance with the present application;

[0065] Figure 18 Fig. 17 is a schematic diagram of a motor rotor and generator with integral arc-shaped pole permanent magnets in accordance with the present application; Figure 17 Fig. 18 is a schematic diagram of a motor rotor and generator with split inter-pole permanent magnets in accordance with the present application;

[0066] Figure 19 Fig. 19 is a schematic diagram of a motor rotor and generator with integral arc-shaped pole permanent magnets in accordance with the present application; Figure 17 Fig. 20 is a schematic diagram of a motor rotor and generator with split inter-pole permanent magnets in accordance with the present application;

[0067] Figure 20 Fig. 21 is a schematic diagram of a motor rotor and generator with integral arc-shaped pole permanent magnets in accordance with the present application; Figure 18 Fig. 22 is a schematic diagram of a motor rotor and generator with split inter-pole permanent magnets in accordance with the present application;

[0068] Figure 21 Fig. 23 is a schematic diagram of a motor rotor and generator with integral arc-shaped pole permanent magnets in accordance with the present application; Figure 17 Fig. 24 is a schematic diagram of a motor rotor and generator with split inter-pole permanent magnets in accordance with the present application;

[0069] Reference numerals:

[0070] 1, rotor support; 2, magnetic pole permanent magnet; 21, first type magnetic pole permanent magnet; 22, second type magnetic pole permanent magnet; 3, pressing strip; 4, inter-pole magnetic concentration permanent magnet; 41, first type inter-pole magnetic concentration permanent magnet; 42, second type inter-pole magnetic concentration permanent magnet; 43, third type inter-pole magnetic concentration permanent magnet; 44, fourth type inter-pole magnetic concentration permanent magnet; 45, fifth type inter-pole magnetic concentration permanent magnet; 46, sixth type inter-pole magnetic concentration permanent magnet; 5, baffle; 6, pole shoe structure; 7, double head stud; 8, first pressing strip bolt; 9, collar; 10, second pressing strip bolt; 11, stator core. DETAILED DESCRIPTION

[0071] The concept, specific structure and generated technical effects of the present application will be described clearly and completely in combination with the embodiments and the drawings below, so as to fully understand the purpose, features and effects of the present application.

[0072] A motor rotor, as shown in Figure 1 , Figure 10 , Figure 17 , comprises a rotor support 1, a plurality of magnetic pole units are uniformly arranged on the side wall of the rotor support 1 in the circumferential direction, and an inter-pole gap is left between two adjacent magnetic pole units.

[0073] As shown in Figure 3 , Figure 7 , Figure 12 , Figure 15 , Figure 18 , Figure 21 , each magnetic pole unit comprises a magnetic pole permanent magnet 2 attached to the side wall of the rotor support 1, a pressing strip 3 and an inter-pole magnetic concentration permanent magnet 4 are arranged at the inter-pole gap, the inter-pole magnetic concentration permanent magnet 4 is attached to the side wall of the rotor support 1 and the left and right ends thereof abut against the magnetic pole permanent magnet 2, the pressing strip 3 is arranged on the inter-pole magnetic concentration permanent magnet 4 and is fixed by a fixing member, and the pressing strip 3 and the fixing member tightly fix the magnetic pole permanent magnet 2 and the inter-pole magnetic concentration permanent magnet 4 on the side wall of the rotor support 1.

[0074] In the embodiment, the rotor support 1 is used for mounting the magnetic pole unit; the magnetic pole permanent magnet 2 and the inter-pole magnetic concentration permanent magnet 4 can be magnetic steel, which is used for being fastened to generate a main magnetic circuit to work; the pressing strip 3 is used for fixing the magnetic pole permanent magnet 2 and the inter-pole magnetic concentration permanent magnet 4; and the fixing member is used for fixing the pressing strip 3. In the embodiment, the pressing strip 3 and the fixing member are used for tightly fixing the magnetic pole permanent magnet 2 and the inter-pole magnetic concentration permanent magnet 4 on the side wall of the rotor support 1, so that the structure is relatively simple, the process procedure involved is simple, and the installation period is short.

[0075] As shown in Figure 1 , Figure 10As shown, the motor rotor is in the form of an inner rotor, the pressing strip 3 and the fixing member tightly fix the magnetic pole permanent magnet 2 and the inter-pole magnetic concentration permanent magnet 4 on the outer side wall of the rotor support 1, the rotor support 1 is provided with a plurality of baffles 5 on the two axial sides through bolt assembly, the magnetic pole permanent magnet 2, the pressing strip 3 and the inter-pole magnetic concentration permanent magnet 4 are all located between the two baffles 5, and the baffles 5 are used for limiting them.

[0076] As shown in Figure 3 , Figure 4 , Figure 7 , Figure 8 , the rotor support 1 is in the structure of an outer polygon and an inner circle, one magnetic pole unit is arranged on each face of the outer polygon, a plurality of permanent magnets in each magnetic pole unit are arranged in a line and the inner ends thereof are attached to the outer wall surface of the rotor support 1, the outer ends are provided with a pole shoe structure 6, the left and right ends of the pole shoe structure 6 abut against the pressing strip 3 of the inter-pole gap and are tightly pressed by the pressing strip 3, the pole shoe structure 6 is composed of a plurality of pole shoe stamping sheets and is provided with an axial tension hole, the stud 7 passes through the axial tension hole and the front and rear ends thereof are fixed on the baffle 5 through nuts, as shown in Figure 2 .

[0077] For the linear permanent magnet type rotor, the process is simple, easy to process and assemble, so the cost is low, and it is easy to be divided into small blocks (divided into small blocks, which is equivalent to a short magnetic leakage path, less road, and naturally less energy consumption), which also reduces the magnetic leakage. In addition, the baffle 5 is fixed on the rotor support 1 through bolts, and then the pole shoe structure 6 is fixed on the baffle 5 through the stud 7, and then the pole shoe structure 6 and the rotor support 1 are fixed through the baffle 5, so that the magnetic pole permanent magnet 2 and the rotor support 1 are fixed through the baffle 5.

[0078] As shown in Figure 4 and Figure 8 , the fixing member is a first pressing strip bolt 8, a plurality of first bolt counterbores are formed on the side wall of the rotor support 1, a plurality of first screw holes are formed on the pressing strip 3, and a plurality of first tension round holes are formed on the inter-pole magnetic concentration permanent magnet 4, the first pressing strip bolt 8 passes through the first bolt counterbores, the first tension round holes and is screw assembled on the first screw holes. That is, the first pressing strip bolt 8 is used to clamp the pressing strip 3, the pressing strip 3 is clamped and fixed on the rotor support 1, and then the inter-pole magnetic concentration permanent magnet 4 on the inner side of the pressing strip 3 is fixed, the pole shoe structure 6 is fixed through the pressing strip 3, and the magnetic pole permanent magnet 2 is fixed through the pole shoe structure 6. The bolt clamping type pressing strip is flexible in assembly, convenient to disassemble and maintain, easy to adjust (the contact pressure is controlled through the bolt pre-tightening force, and the risk of loosening is reduced), and has wide adaptability (suitable for installation of various sizes).

[0079] As shown in Figure 3 and Figure 7As shown, the pole shoe structure 6 is shaped as a trapezoid or an arc, and when shaped as an arc, the outer diameter of the arc is concentric or eccentric with the rotor support 1. The pole shoe structure 6 is made of high-permeability lamination sheets with a thickness of 0.3mm-1.5mm through lamination.

[0080] In this embodiment, the rotor support 1 has a polygonal shape with a side number of a, and a≥4; in each magnetic pole unit, the number of the magnetic pole permanent magnets 2 is b, and 3≤b≤15.

[0081] The plurality of magnetic pole permanent magnets 2 are regularly distributed in the circumferential direction and the axial direction of the rotor support 1, specifically, uniformly distributed along the circumference of the rotor support 1 in the circumferential direction, and aligned and uniformly distributed along a straight line in the axial direction. With this arrangement of permanent magnets, the magnetic field distribution is more uniform. The circumferential uniform distribution ensures that the air gap magnetic flux density is close to a sine wave, reducing the harmonic content, thereby reducing motor torque ripple and noise, and improving motor stability. The axial alignment can reduce the circumferential unbalanced magnetic pull; the centrifugal force is uniformly distributed.

[0082] As shown in Figure 4 , Figure 8 , a fastening gap is reserved between the inter-pole magnetic concentrating permanent magnet 4 and the rotor support 1, the thickness of the fastening gap is 0.5mm-3mm, and the fastening gap is filled with a flexible material. The purpose of setting the fastening gap is to facilitate the pre-tightening of the pressing strip 3, which drives the inter-pole magnetic concentrating permanent magnet 4 to move towards the fastening gap for fixation. The purpose of filling the fastening gap with a flexible material is to firmly attach the inter-pole magnetic concentrating permanent magnet 4 to the inner wall of the rotor support. Because the permanent magnet has the characteristics of resisting tension but not compression, if the bolt is not filled with flexible material and pre-tightened, it may cause the permanent magnet to break directly.

[0083] The inter-pole magnetic concentrating permanent magnet 4 is a bonded permanent magnet, and the inter-pole magnetic concentrating permanent magnet 4 is either split type or integral type, as shown in Figure 5 , Figure 9 , Figure 14 and Figure 16 . The magnetization angle of the split type inter-pole magnetic concentrating permanent magnet 4 is 0°-60°, and the magnetization angle of the integral type inter-pole magnetic concentrating permanent magnet 4 is 90°, as shown in Figure 3 , Figure 4 , Figure 7 , Figure 8 , Figure 12 , Figure 15 , Figure 18 , Figure 21 . Specifically, the split type inter-pole magnetic concentrating permanent magnet 4 includes a first type of inter-pole magnetic concentrating permanent magnet 41, a third type of inter-pole magnetic concentrating permanent magnet 43, and a sixth type of inter-pole magnetic concentrating permanent magnet 46, which are respectively suitable for Figure 1 , Figure 10 , Figure 17The motor rotor and generator in the form of the integrated inter-pole magnetic concentration permanent magnet 4 includes the second type of inter-pole magnetic concentration permanent magnet 42, the fourth type of inter-pole magnetic concentration permanent magnet 44, and the fifth type of inter-pole magnetic concentration permanent magnet 45, which are respectively suitable for Figure 1 、 Figure 10 、 Figure 17 The motor rotor and generator in the form of the integrated inter-pole magnetic concentration permanent magnet 4.

[0084] The split inter-pole magnetic concentration permanent magnet 4 has the characteristics that it can be magnetized according to the required magnetic chain direction angle, can form a combination of multiple directions and angles, and significantly improves the air gap flux density. However, the split structure leads to low mechanical strength, needs to be magnetized separately, and has high cost. The split inter-pole magnetic concentration permanent magnet 4 is suitable for high dynamic response and high torque density occasions.

[0085] The integrated inter-pole magnetic concentration permanent magnet 4 has the characteristics of simple manufacturing, high mechanical strength, reduced positioning and other complex installation processes, and low cost, but the magnetic field uniformity is poor, and it can only be magnetized in a single direction and a single angle. The integrated inter-pole magnetic concentration permanent magnet 4 is suitable for high-speed occasions with low requirements for magnetic concentration effect.

[0086] As shown in Figure 6 , the pressing strip 3 is in the shape of a dovetail, which presses the inter-pole magnetic concentration permanent magnet 4 and the pole shoe structure 6 or the magnetic pole permanent magnet 2 at the same time; the inter-pole magnetic concentration permanent magnet 4 is trapezoidal, which fixes the magnetic pole permanent magnet 2 while being pressed; the rotor support 1 is made of high-permeability steel material, and the pressing strip 3 is made of weak magnetic or non-magnetic material.

[0087] As shown in Figure 10 、 Figure 11 , the rotor support 1 is in the shape of a circular barrel, and the outer circular surface of the rotor support 1 is provided with a plurality of axial through-type notches, the magnetic pole permanent magnet 2 is in the shape of an integral arc, and the inner arc surface is provided with a protruding portion in the axial direction, as shown in Figure 13 , the magnetic pole permanent magnet 2 is the first type of magnetic pole permanent magnet 21, and the protruding portion is fitted on the through-type notch. The protruding portion and the through-type notch are used to limit the magnetic pole permanent magnet 2 on the outer circular surface of the rotor support 1.

[0088] As shown in Figure 12 、 Figure 15As shown, the fixing member is a collar 9, which is sleeved outside the magnetic pole permanent magnet 2 and the pressing strip 3. The protrusion and the through-type notch limit the circumferential movement of the magnetic pole permanent magnet 2, and then the collar 9 is sleeved on the magnetic pole permanent magnet 2 to limit the radial movement of the magnetic pole permanent magnet 2, thereby fixing the magnetic pole permanent magnet 2. Meanwhile, the circumferential movement of the pressing strip 3 is limited due to the blockage of the magnetic pole permanent magnet 2, and then the collar 9 is sleeved on the pressing strip 3 to limit the radial movement of the pressing strip 3. In addition, the axial baffle 5 limits the axial movement of the magnetic pole permanent magnet 2 and the pressing strip 3. Therefore, the circumferential, radial and axial movements of the magnetic pole permanent magnet 2 and the pressing strip 3 are limited in the embodiment, thereby fixing the magnetic pole permanent magnet 2 and the pressing strip 3.

[0089] As shown in Figure 12 , Figure 15 , the magnetic pole permanent magnet 2 is a bonded permanent magnet, and the inner arc radius of the magnetic pole permanent magnet 2 is equal to the outer circle radius of the rotor support 1, so as to be attached to the outer circle of the rotor support 1. The protrusion of the magnetic pole permanent magnet 2 is consistent with the shape of the through-type notch of the rotor support 1, so as to limit the circumferential movement of the magnetic pole permanent magnet 2.

[0090] As shown in Figure 12 , Figure 15 , the collar 9 is a hollow circular tube, and the thickness is 2-6 cm. The inner circle radius of the collar 9 is equal to the outer circle radius of the arc-shaped magnetic pole permanent magnet 2 and the outer circle radius of the pressing strip 3. The collar 9 is made of weak magnetic or non-magnetic material (mainly carbon fiber winding). In the embodiment, the form of the collar 9 can significantly reduce the weight of the rotor, increase the specific strength, reduce the moment of inertia, and improve the response speed of the motor. In addition, the outer layer in the form of the collar can withstand high-speed centrifugal force. Similarly, the fiber can reduce the eddy current loss. The surface of the collar is smooth, which reduces the wind friction loss.

[0091] As shown in Figure 17 , the motor rotor is in the form of an outer rotor, the pressing strip 3 and the fixing member press and fix the magnetic pole permanent magnet 2 and the inter-pole magnetic concentration permanent magnet 4 on the inner side wall of the rotor support 1, and the rotor support 1 is in the form of a barrel.

[0092] As shown in Figure 18 , Figure 21As shown, the fixing member is a second pressing bolt 10, a plurality of second bolt counterbores are formed on the side wall of the rotor support 1, a plurality of second screw holes are formed on the pressing strip 3, a plurality of second tension round holes are formed on the inter-pole magnetic concentrating permanent magnet 4, and the second pressing bolt 10 passes through the second screw hole, the second tension round hole and is threadedly assembled on the second bolt counterbores. That is, the second pressing bolt 10 is used to assemble the pressing strip 3, the pressing strip 3 is fixed on the rotor support 1, and then the inter-pole magnetic concentrating permanent magnet 4 inside the pressing strip 3 is fixed, and the magnetic pole permanent magnet 2 is fixed by the pressing strip 3. The bolt assembly type pressing strip is flexible, convenient to disassemble and maintain, easy to adjust (the contact pressure is controlled by the bolt pre-tightening force, and the risk of loosening is reduced), and has wide adaptability (it is suitable for installation of various sizes).

[0093] As shown in Figure 19 , the magnetic pole permanent magnet 2 is a second type of magnetic pole permanent magnet 22, and the magnetic pole permanent magnet 2 is a bonded integrated permanent magnet, which is arranged at an axial inclined angle when installed in the inner circle of the rotor support 1, which is equivalent to using an inclined pole. The inclined pole can reduce the cogging torque, suppress the torque ripple, improve the motor stability, and thus reduce the electromagnetic noise and vibration. And it can improve the back EMF waveform, making it closer to a sine wave. The magnetic pole permanent magnet 2 is arc-shaped, and inclined surfaces are formed on both sides of the arc-shaped inner circle for embedding the pressing strip 3, so as to facilitate the pressing strip 3 to apply pre-tightening force to press it. The outer arc radius of the arc-shaped magnetic pole permanent magnet 2 is equal to the inner circle radius of the rotor support 1, so as to facilitate the magnetic pole permanent magnet 2 to be attached to the inner circle of the rotor support 1. The array mode of the magnetic pole permanent magnet on the rotor support is shown in Figure 20 .

[0094] A generator includes a motor rotor and a stator core 11;

[0095] As shown in Figure 1 and Figure 10 , when the motor rotor is an inner rotor, the motor rotor is inserted into the stator core 11;

[0096] As shown in Figure 17 , when the motor rotor is an outer rotor, the stator core 11 is inserted into the motor rotor.

[0097] In this embodiment, for the inner rotor type generator, the permanent magnet is on the inner side of the stator, and the stator winding is fixed on the shell. The stator winding directly contacts the shell, which can be efficiently cooled by external cooling fins or liquid cooling system. The rotor heat is transmitted to the stator through the air gap, which is suitable for high power density applications, small rotor diameter, low centrifugal force under the same conditions, suitable for high-speed operation, easy to maintain and repair, high dynamic response requirements of precise control scene.

[0098] For the outer rotor type generator, the permanent magnet is fixed on the outer rotating shell, the stator winding is fixed on the inner central shaft, and the rotor can directly serve as the support structure of the mechanical load; the outer rotor mass is distributed on the outer edge, the moment of inertia is large, and the torque fluctuation can be smoothed. The rotor radius is large, the torque is significantly improved under the same electromagnetic force, and it is suitable for low-speed large-torque scenes.

[0099] The above describes the embodiments of the present application, but the present application is not limited to the above-mentioned embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. An electric machine rotor, characterized in that, The rotor support (1) is uniformly equipped with a plurality of magnetic pole units on the side wall in the circumferential direction, and an inter-pole gap is left between two adjacent magnetic pole units. Each magnetic pole unit comprises a magnetic pole permanent magnet (2) attached to the side wall of the rotor support (1), a pressing strip (3) and an inter-pole magnetic concentration permanent magnet (4) are equipped at the inter-pole gap, the inter-pole magnetic concentration permanent magnet (4) is attached to the side wall of the rotor support (1) and abuts against the magnetic pole permanent magnet (2) at the left and right ends, the pressing strip (3) is equipped on the inter-pole magnetic concentration permanent magnet (4) and is fixed by a fixing member, the magnetic pole permanent magnet (2) and the inter-pole magnetic concentration permanent magnet (4) are tightly fixed on the side wall of the rotor support (1) by the pressing strip (3) and the fixing member.

2. An electrical machine rotor as claimed in claim 1, characterised in that The motor rotor is in the form of an inner rotor, the magnetic pole permanent magnet (2) and the inter-pole magnetic concentration permanent magnet (4) are tightly fixed on the outer side wall of the rotor support (1) by the pressing strip (3) and the fixing member, and the axial two sides of the rotor support (1) are equipped with a plurality of baffles (5) through bolts, and the magnetic pole permanent magnet (2), the pressing strip (3) and the inter-pole magnetic concentration permanent magnet (4) are located between the axial two baffles (5).

3. An electrical machine rotor as claimed in claim 2, characterised in that, The rotor support (1) is in the shape of an outer polygon and an inner circle, one magnetic pole unit is arranged on each side of the outer polygon, and a plurality of permanent magnets in each magnetic pole unit are arranged in a linear type and abut against the outer wall of the rotor support (1) at the inner end, and a pole shoe structure (6) is arranged at the outer end, the pole shoe structure (6) abuts against the pressing strip (3) of the inter-pole gap at the left and right ends and is tightly pressed by the pressing strip (3), the pole shoe structure (6) is composed of a plurality of pole shoe stamping sheets and is provided with an axial tension hole, a stud (7) passes through the axial tension hole and is fixed on the baffle (5) by nuts at the front and rear ends.

4. An electrical machine rotor as claimed in claim 3, characterised in that, The fixing member is a first pressing strip bolt (8), a plurality of first bolt counterbores are formed on the side wall of the rotor support (1), a plurality of first screw holes are formed on the pressing strip (3), and a plurality of first tension round holes are formed on the inter-pole magnetic concentration permanent magnet (4), the first pressing strip bolt (8) passes through the first bolt counterbores and the first tension round holes and is threadedly equipped on the first screw holes.

5. An electrical machine rotor as claimed in claim 3, characterised in that, The pole shoe structure (6) is in the shape of a trapezoid or an arc, when the arc is adopted, the outer diameter of the arc is concentric or eccentric with the rotor support (1), and the pole shoe structure (6) is made by laminating high-permeability stamping sheets with a thickness of 0.3mm-1.5mm.

6. An electrical machine rotor as claimed in claim 3, characterised in that, 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 magnetic pole permanent magnets (2) is b, and 3≤b≤15; A plurality of magnetic pole permanent magnets (2) are regularly distributed in the circumferential direction and the axial direction of the rotor support (1), specifically, they are uniformly distributed along the circumference of the rotor support (1) in the circumferential direction and are aligned and uniformly distributed along a straight line in the axial direction.

7. An electrical machine rotor as claimed in claim 1, characterised in that, A fastening gap is reserved between the inter-pole magnetic concentration permanent magnet (4) and the rotor support (1), the thickness of the fastening gap is 0.5mm-3mm, and the fastening gap is filled with a flexible material.

8. An electrical machine rotor as claimed in claim 1, characterised in that The inter-pole magnetic concentrator (4) is a bonded permanent magnet, and the inter-pole magnetic concentrator (4) is in a split type or an integrated type, the magnetization angle of the inter-pole magnetic concentrator (4) in the split type is 0°-60°, and the magnetization angle of the inter-pole magnetic concentrator (4) in the integrated type is 90°.

9. An electrical machine rotor as claimed in claim 1, characterised in that, The pressing strip (3) is in a dovetail shape, and the inter-pole magnetic concentrator (4) is in a trapezoidal shape; the rotor support (1) is made of high-permeability steel material, and the pressing strip (3) is made of weak magnetic or non-permeable material.

10. An electrical machine rotor as claimed in claim 2, characterised in that The rotor support (1) is in a circular barrel shape, and a plurality of axial through-type notches are arranged on the outer circular surface of the rotor support (1); the magnetic pole permanent magnet (2) is in an integrated arc shape, and a protruding portion is arranged on the inner arc surface in the axial direction, and the protruding portion is fitted on the through-type notch.

11. An electrical machine rotor as claimed in claim 10, characterised in that, The fixing member is a sleeve ring (9), and the sleeve ring (9) is sleeved on the outer side of the magnetic pole permanent magnet (2) and the pressing strip (3).

12. An electrical machine rotor as claimed in claim 10, characterised 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 circular radius of the rotor support (1), and the protruding portion of the magnetic pole permanent magnet (2) is consistent with the shape of the through-type notch of the rotor support (1).

13. An electrical machine rotor as claimed in claim 11, characterised in that The sleeve ring (9) is in a hollow circular tube shape, the thickness is 2-6 cm, the inner circular radius of the sleeve ring (9) is equal to the outer circular radius of the arc-shaped magnetic pole permanent magnet (2) and the outer circular radius of the pressing strip (3), and the sleeve ring (9) is made of weak magnetic or non-permeable material.

14. An electrical machine rotor as claimed in claim 1, characterised in that The motor rotor is in an outer rotor form, the pressing strip (3) and the fixing member press and fix the magnetic pole permanent magnet (2) and the inter-pole magnetic concentrator (4) on the inner side wall of the rotor support (1), and the rotor support (1) is in a barrel shape.

15. An electrical machine rotor as claimed in claim 14, characterised in that, The fixing member is a second pressing strip bolt (10), a plurality of second bolt counterbores are arranged on the side wall of the rotor support (1), a plurality of second screw holes are arranged on the pressing strip (3), a plurality of second tension round holes are arranged on the inter-pole magnetic concentrator (4), and the second pressing strip bolt (10) passes through the second screw hole and the second tension round hole and is threadedly assembled on the second bolt counterbores.

16. An electrical machine rotor as claimed in claim 14, characterised in that The magnetic pole permanent magnet (2) is a bonded integrated permanent magnet, is arranged in an axial inclined angle when being installed on the inner circle of the rotor support (1), is in an arc shape, and has an inclined surface on both sides of the arc-shaped inner circle for embedding the pressing strip (3), and the outer arc radius of the arc-shaped magnetic pole permanent magnet (2) is equal to the inner circular radius of the rotor support (1).

17. A generator based on the rotor of any one of claims 1-16, characterized by The motor rotor and the stator core (11) are included. 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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