Distribution magnetic bridge type permanent magnet auxiliary synchronous magnetic resistance starting power generation device and distribution magnetic bridge type permanent magnet auxiliary synchronous magnetic resistance starting power generation system

Abstract

The invention relates to the field of motors, particularly provides a distributed magnetic bridge type permanent magnet auxiliary synchronous reluctance starting power generation device and system, and aims to solve the problems that a rotor magnetic bridge of a power generator in the prior art is thick and magnetic leakage occurs, and the mechanical strength requirement of a rotor of a permanent magnet auxiliary synchronous reluctance starting power generator during high-speed operation cannot be met. A distributed magnetic bridge type permanent magnet auxiliary synchronous magnetic resistance starting power generation device comprises a stator assembly, a rotor assembly, a rotating shaft, a shell and an end cover, the rotor assembly is arranged on the rotating shaft in a sleeving mode, the stator assembly is arranged on the rotor assembly in a sleeving mode and rotationally connected with the rotor assembly, and the end cover is connected with the shell. The stator assembly, the rotor assembly and the rotating shaft are packaged in the shell through the shell and the end cover to form the distributed magnetic bridge type permanent magnet auxiliary synchronous magnetic resistance starting power generation device. The distributed magnetic bridge type permanent magnet auxiliary synchronous reluctance starting power generation device and system provided by the invention are used for motor design.

Description

Technical Field

[0001] The present disclosure relates to the field of motor technology, and in particular to a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator device and system. Background Art

[0002] Permanent magnet assisted synchronous reluctance motor has the advantages of large capacity, high power density, high efficiency, strong short circuit resistance and high reliability. In addition, permanent magnet assisted synchronous reluctance motor has received extensive attention and development in aircraft power supply systems. As a core key component of more electric aircraft, permanent magnet assisted synchronous reluctance starter generator has the advantages of high speed, high power density, and integrated starting and power generation. Compared with traditional permanent magnet assisted synchronous reluctance starter generator, the rotor magnetic bridge of traditional permanent magnet assisted synchronous reluctance starter generator is thicker and has increased leakage magnetic field, which cannot meet the mechanical strength requirements of high-speed operation of permanent magnet assisted synchronous reluctance starter generator rotor.

[0003] Therefore, how to solve the problem in the prior art that the rotor magnetic bridge of the traditional permanent magnet assisted synchronous reluctance starter generator is thick and leaks magnetic flux, and cannot meet the mechanical strength requirements of the permanent magnet assisted synchronous reluctance starter generator rotor when running at high speed is one of the important issues that need to be urgently solved in this field. Summary of the invention

[0004] In view of this, the embodiments of the present disclosure provide a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator device and system to solve the problem in the prior art that the rotor magnetic bridge of the generator is thick and leaks magnetic flux, and cannot meet the mechanical strength requirements of the permanent magnet assisted synchronous reluctance starting generator rotor when running at high speed.

[0005] According to one aspect of the present disclosure, a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator is provided, comprising: a stator assembly, a rotor assembly, a rotating shaft, a housing and an end cover, wherein the rotor assembly is sleeved on the rotating shaft, the stator assembly is sleeved on the rotor assembly and is rotatably connected to the rotor assembly, the end cover is connected to the housing, and the stator assembly, the rotor assembly and the rotating shaft are encapsulated in the housing through the housing and the end cover to form a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator;

[0006] The rotor assembly comprises: a rotor, a plurality of rotor cores, a plurality of permanent magnets and a rotor protective sleeve. The rotor is provided with a through hole for inserting each rotor core. Each permanent magnet is arranged in each rotor core. The rotor protective sleeve is sleeved on the outer wall of the rotor. The thickness of the permanent magnets decreases in sequence along the radial direction close to the stator assembly. Each permanent magnet is used to adjust the dual three-phase short-circuit current.

[0007] The stator assembly includes: a stator, multiple stator cores and multiple stator windings. The stator is mounted on the rotor, and there is a gap between the stator and the rotor. The stator is a 4-pole 24-slot structure. Each stator core is correspondingly arranged in the 4-pole 24-slot structure of the stator. Each stator winding is distributed along the circumferential direction of the stator and each stator winding is a double three-phase winding.

[0008] In addition, according to one aspect of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator device of the present disclosure, each rotor core includes: a horizontal magnetic barrier, an inclined magnetic barrier, an inner magnetic bridge, an outer magnetic bridge and a rotor magnetic rib. The outer magnetic bridge is located between the outer circle of the rotor and the inclined magnetic barrier, the inner magnetic bridge is located between the horizontal magnetic barriers, the inner magnetic bridge is used to divide the horizontal magnetic barrier into multiple sections, the rotor magnetic ribs are located at the position of the horizontal magnetic barrier, and the outer magnetic bridge is used to connect the rotor magnetic ribs.

[0009] According to a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator device according to one aspect of the present disclosure, each rotor core is a rotor core of a U-shaped magnetic barrier structure.

[0010] According to a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator device according to one aspect of the present disclosure, each rotor core is a rotor core formed by stacking a plurality of magnetic conductive punching sheets.

[0011] According to a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator device according to one aspect of the present disclosure, the rotor assembly also includes two reference directions, the d-axis and the q-axis. Under one pole, the d-axis is located on the symmetry center line under one pole, and the q-axis is located on the symmetry center line of two adjacent poles.

[0012] According to a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator device according to one aspect of the present disclosure, under one pole, a first layer of magnetic barriers, a second layer of magnetic barriers and a third layer of magnetic barriers are arranged in sequence along the direction of the d-axis, the radial size of the first layer of magnetic barriers is larger than the radial size of the second layer of magnetic barriers, and the radial size of the second layer of magnetic barriers is larger than the radial size of the third layer of magnetic barriers.

[0013] According to a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating device according to one aspect of the present disclosure, the rotor protection cover is a carbon fiber rotor protection cover.

[0014] According to a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator device according to one aspect of the present disclosure, the interval angle between two adjacent stator windings is 30° electrical angle.

[0015] According to another aspect of the present disclosure, a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating system is provided, including the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating device provided in one aspect of the present disclosure.

[0016] At least one of the above technical solutions adopted in the embodiments of the present disclosure can achieve the following beneficial effects: the rotor assembly is sleeved on the rotating shaft, the stator assembly is sleeved on the rotor assembly and is rotatably connected to the rotor assembly, the end cover is connected to the housing, and the stator assembly, the rotor assembly and the rotating shaft are encapsulated in the housing through the housing and the end cover to form a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator. Based on this, a through hole is opened on the rotor for each rotor core to be inserted, each permanent magnet is arranged in each rotor core, and the rotor protective sleeve is sleeved on the outer wall of the rotor. Each permanent magnet is used to adjust the dual three-phase short-circuit current. The opening of a through hole in each rotor core can reduce the local stress of the rotor and increase the mechanical strength of the permanent magnet assisted synchronous reluctance starting generator rotor when it runs at high speed. Secondly, the thickness of the permanent magnet along the radial direction close to the stator assembly is reduced successively, which increases the salient pole ratio and improves the power density of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator. In addition, each permanent magnet is arranged in each rotor core. By adjusting the amount of permanent magnets embedded in the rotor core, the short-circuit resistance design of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator can be achieved, thereby improving the reliability of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator. On this basis, the stator is sleeved on the rotor, and there is a gap between the stator and the rotor. The stator is a 4-pole 24-slot structure, and each stator core is correspondingly arranged in the 4-pole 24-slot structure of the stator. Each stator winding is distributed along the circumferential direction of the stator and each stator winding is a double three-phase winding. Through the cooperation between the rotor and the stator, and through holes are opened on the rotor, the distance between each permanent magnet is shortened, the harmonic content is reduced, the power density of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator is improved, and the leakage magnetic problem is avoided. At the same time, the rotor core is arranged in the through hole of the rotor, and the thickness of the permanent magnet along the radial direction close to the stator assembly is successively reduced, thereby reducing the thickness of the rotor core of the rotor, effectively solving the problem that the rotor magnetic bridge of the generator in the prior art is thick and leaks magnetic flux, and cannot meet the mechanical strength requirements of the permanent magnet assisted synchronous reluctance starting generator rotor when running at high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 The figure shows a structural diagram of a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating device according to an embodiment of the present disclosure;

[0019] Figure 2 is a structural diagram illustrating a rotor according to an embodiment of the present disclosure;

[0020] Figure 3 is a schematic diagram further illustrating the magnetic flux distribution of a conventional distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to an embodiment of the present disclosure;

[0021] Figure 4 is a schematic diagram further illustrating the magnetic flux distribution of a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to an embodiment of the present disclosure;

[0022] Figure 5 is a schematic diagram further illustrating the rotor stress distribution of a conventional distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to an embodiment of the present disclosure;

[0023] Figure 6 It is a schematic diagram further illustrating the rotor stress distribution of a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to an embodiment of the present disclosure;

[0024] Figure 7 is a schematic diagram further illustrating the waveform distribution of the back electromotive force of the no-load line of the conventional distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating device according to an embodiment of the present disclosure;

[0025] Figure 8 It is a schematic diagram further illustrating the waveform distribution of the back electromotive force of the no-load line of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating device according to an embodiment of the present disclosure;

[0026] Fig. 9 It is a schematic diagram further illustrating the distribution of different parameters of a traditional distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating device and a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating device according to an embodiment of the present disclosure.

[0027] Reference numerals:

[0028] 1- stator assembly, 11- stator, 12- stator winding, 13- stator core, 2- rotor assembly, 21- rotor, 22- rotor core, 221- horizontal magnetic barrier, 222- inclined magnetic barrier, 223- inner magnetic bridge, 224- outer magnetic bridge, 225- rotor magnetic rib, 23- permanent magnet, 24- rotor protective cover. DETAILED DESCRIPTION

[0029] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0030] It should be understood that the various steps described in the method embodiments of the present disclosure may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present disclosure is not limited in this respect.

[0031] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0032] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0033] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0034] Permanent magnet assisted synchronous reluctance motor has the advantages of large capacity, high power density, high efficiency, strong short circuit resistance and high reliability. In addition, permanent magnet assisted synchronous reluctance motor has received extensive attention and development in aircraft power supply systems. As a core key component of more electric aircraft, permanent magnet assisted synchronous reluctance starter generator has the advantages of high speed, high power density, and integrated starting and power generation. Compared with traditional permanent magnet assisted synchronous reluctance starter generator, the rotor magnetic bridge of traditional permanent magnet assisted synchronous reluctance starter generator is thicker and has increased leakage magnetic field, which cannot meet the mechanical strength requirements of high-speed operation of permanent magnet assisted synchronous reluctance starter generator rotor.

[0035] In response to the above problems, an exemplary embodiment of the present disclosure provides a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator device and system to solve the problem that the rotor magnetic bridge of the generator in the prior art is thick and leaks magnetic flux, and cannot meet the mechanical strength requirements of the permanent magnet assisted synchronous reluctance starting generator rotor when running at high speed.

[0036] A distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating device according to an embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0037] Figure 1The figure shows a structural diagram of a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to an embodiment of the present disclosure. Figure 1 As shown, a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator comprises: a stator assembly 1, a rotor assembly 2, a rotating shaft, a housing and an end cover, wherein the rotor assembly 2 is sleeved on the rotating shaft, the stator assembly 1 is sleeved on the rotor assembly 2 and is rotatably connected to the rotor assembly 2, the end cover is connected to the housing, and the stator assembly 1, the rotor assembly 2 and the rotating shaft are encapsulated in the housing through the housing and the end cover to form a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator; the rotor assembly 2 comprises: a rotor 21, a plurality of rotor cores 22, a plurality of permanent magnets 23 and a rotor protective cover 24, the rotor 21 is provided with a through hole for each rotor core 22 to be inserted, and each permanent magnet 23 It is arranged in each rotor core 22, and the rotor protection cover 24 is sleeved on the outer wall of the rotor 21. The thickness of the permanent magnet along the radial direction close to the stator assembly 1 decreases successively. Each permanent magnet 23 is used to adjust the double three-phase short-circuit current; the stator assembly 1 includes: a stator 11, a plurality of stator cores 13 and a plurality of stator windings 12. The stator 11 is sleeved on the rotor 21, and there is a gap between the stator 11 and the rotor 21. The stator 11 is a 4-pole 24-slot structure. Each stator core 13 is correspondingly arranged in the 4-pole 24-slot structure of the stator 11. Each stator winding 12 is distributed along the circumferential direction of the stator 11 and each stator winding 12 is a double three-phase winding.

[0038] In practical applications, such as Figure 1As shown, the rotor assembly 2 is sleeved on the rotating shaft, the stator assembly 1 is sleeved on the rotor assembly 2 and is rotatably connected with the rotor assembly 2, the end cover is connected to the housing, and the stator assembly 1, the rotor assembly 2 and the rotating shaft are encapsulated in the housing through the housing and the end cover to form a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator. Based on this, a through hole is opened on the rotor 21 for each rotor core 22 to be inserted, each permanent magnet 23 is arranged in each rotor core 22, and the rotor protective cover 24 is sleeved on the outer wall of the rotor 21. Each permanent magnet 23 is used to adjust the double three-phase short-circuit current. The opening of a through hole in each rotor core 22 can reduce the local stress of the rotor 21 and increase the mechanical strength of the permanent magnet assisted synchronous reluctance starting generator rotor 21 when it runs at high speed. Secondly, the thickness of the permanent magnet along the radial direction close to the stator assembly 1 is reduced successively, which increases the salient pole ratio and improves the power density of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator. In addition, each permanent magnet 23 is arranged in each rotor core 22. By adjusting the amount of permanent magnets embedded in the rotor core 22, the short-circuit resistance design of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator can be achieved, thereby improving the reliability of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator. On this basis, the stator 11 is sleeved on the rotor 21, and there is a gap between the stator 11 and the rotor 21. The stator 11 is a 4-pole 24-slot structure, and each stator core 13 is correspondingly arranged in the 4-pole 24-slot structure of the stator 11. Each stator 11 winding is distributed along the circumferential direction of the stator 11 and each stator winding 12 is a double three-phase winding. Through the cooperation between the rotor 21 and the stator 11, and a through hole is opened on the rotor 21, the distance between each permanent magnet is shortened, the harmonic content is reduced, the power density of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator is improved, and the leakage magnetic problem is avoided. At the same time, the rotor core is arranged in the through hole of the rotor 21, and the thickness of the permanent magnet along the radial direction close to the stator assembly 1 is successively reduced, thereby reducing the thickness of the rotor core 22 of the rotor 21, effectively solving the problem that the rotor magnetic bridge of the generator in the prior art is thick and leaks magnetic flux, and cannot meet the mechanical strength requirements of the permanent magnet assisted synchronous reluctance starting generator rotor when it runs at high speed.

[0039] Figure 2 2 is a structural diagram illustrating a rotor 21 according to an embodiment of the present disclosure. Figure 2 As shown, each rotor 21 core includes: a horizontal magnetic barrier 221, an inclined magnetic barrier 222, an inner magnetic bridge 223, an outer magnetic bridge 224 and a rotor magnetic rib 225. The outer magnetic bridge 224 is located between the outer circle of the rotor and the inclined magnetic barrier 222, the inner magnetic bridge 223 is located between the horizontal magnetic barriers 221, the inner magnetic bridge 223 is used to divide the horizontal magnetic barrier 221 into multiple sections, the rotor magnetic ribs 225 are located at the position of the horizontal magnetic barrier 221, and the outer magnetic bridge 224 is used to connect the rotor magnetic ribs 225.

[0040] In practical applications, such as Figure 2As shown, the rotor assembly also includes two reference directions, the d-axis and the q-axis, wherein d represents the d-axis and q represents the q-axis. Under one pole, the d-axis is located on the symmetric center line under one pole, and the q-axis is located on the symmetric center line between two adjacent poles. Under one pole, the first layer of magnetic barriers, the second layer of magnetic barriers and the third layer of magnetic barriers are sequentially arranged along the direction of the d-axis, the radial dimension of the first layer of magnetic barriers is greater than the radial dimension of the second layer of magnetic barriers, and the radial dimension of the second layer of magnetic barriers is greater than the radial dimension of the third layer of magnetic barriers.

[0041] For example, if Figure 1 As shown, the internal magnetic bridges are arranged in a distributed manner. There are two internal magnetic bridges in the first layer, which are symmetrical along the d axis, dividing the first layer of horizontal magnetic barriers into three sections. There are two internal magnetic bridges in the second layer, which are symmetrical along the d axis, dividing the second layer of horizontal magnetic barriers into three sections. There is one internal magnetic bridge in the third layer, which is located on the center line of the d axis, dividing the third layer of horizontal magnetic barriers into two sections. The distances from the first layer of internal magnetic bridges and the second layer of internal magnetic bridges to the d axis are different.

[0042] Specifically, Figure 2 As shown, the width of the inner magnetic bridge along the direction perpendicular to the d-axis is w1, w2, and w3, the distance from the first layer of inner magnetic bridge to the d-axis axis is d1, and the distance from the second layer of inner magnetic bridge to the d-axis axis is d2. The width of the outer magnetic bridge along the radial direction is w4, w5, and w6, and the thickness of the horizontal magnetic barrier is h5, h6, and h7. Since the permanent magnet is located in the rotor magnetic barrier, the thickness of the horizontal magnetic barrier can actually represent the thickness of the permanent magnet. The thickness of the inclined magnetic barrier is h8, h9, and h10, and the width of the permanent magnet embedded area is L1, L3, and L5. The width of the horizontal magnetic barrier is L2, L4, and L6, and the width of the inclined magnetic barrier is L7, L8, and L9. According to the topological structure of the rotor core, the magnetic circuit modeling method is used to obtain the magnetic resistance of each part of the rotor:

[0043]

[0044] R rd =R drp +R bridge / / R barrier

[0045] R bridge =R ob / / R ib

[0046] R barrier =R bh / / R bi

[0047] Among them, R ib Represents the internal magnetic bridge reluctance, R ob Represents the external magnetic bridge reluctance, R bh Represents the horizontal magnetic barrier reluctance, R birepresents the magnetic resistance of the inclined magnetic barrier, R drp represents the d-axis magnetic rib reluctance, R qrp represents the q-axis magnetic rib reluctance, R bridge Represents the total magnetic resistance of the magnetic bridge, R barrier Represents the total magnetic resistance of the magnetic barrier, R g Represents the air gap reluctance, R rd represents the d-axis magnetic resistance, R rq represents the q-axis magnetic resistance, μ0 represents the vacuum magnetic permeability, μ s Indicates the rotor magnetic bridge permeability, μ n represents the magnetic permeability of the rotor ribs, l ef represents the equivalent length of the rotor, δ represents the air gap thickness, and r represents the outer diameter of the rotor.

[0048] The size parameters of the inner magnetic bridge meet the following requirements:

[0049]

[0050] Further, the d-axis-q-axis inductance and the salient pole ratio of the distributed magnetic bridge permanent magnet assisted synchronous reluctance starting generator device can be obtained:

[0051]

[0052] Among them, L d Indicates the d-axis inductance, L q represents the q-axis inductance, and ρ is the salient pole ratio.

[0053] The influence of rotor size parameters on the salient pole ratio is calculated by the magnetic circuit method. In the above-mentioned distributed magnetic bridge permanent magnet assisted synchronous reluctance starting generator, the inner magnetic bridge width satisfies 2w1≥2w2≥w3, the distance from the inner magnetic bridge to the axis satisfies 0.3≤d2 / d1≤0.618, the outer magnetic bridge width satisfies w4≥w5≥w6, the thickness of the horizontal magnetic barrier satisfies h5≥h6≥h7, the thickness of the inclined magnetic barrier satisfies h8≥h9≥h10, the permanent magnet embedding width satisfies L1≥L3≥L5, L2≥L4≥L6, L7≥L8≥L9, and also satisfies 0.75≤L1 / L2≤0.95, 0.75≤L3 / L4≤0.95, and 0.75≤L5 / L6≤0.95.

[0054] Since the thickness of the horizontal magnetic barrier is different from that of the inclined magnetic barrier, the equivalent thickness of each layer of magnetic barrier is hb1, hb2, and hb3, respectively, and each expression is:

[0055]

[0056] The magnetic barrier thickness, magnetic rib thickness and effective thickness of each rotor core are hb, hp and hr, and the magnetic barrier insulation ratio is defined as kb, and its expressions are as follows:

[0057] hb=hb1+hb2+hb3

[0058] hp=h1+h2+h3+h4

[0059] hr=h1+h2+h3+h4+h5+h6

[0060] kb=(hb1+hb2+hb3) / hr

[0061] Specifically, the equivalent thickness of each magnetic barrier layer satisfies 0.3≤hb1 / hr≤0.35, 0.3≤hb2 / hr≤0.35, 0.3≤hb3 / hr≤0.35, and the magnetic barrier insulation ratio satisfies 0.4≤kb≤0.6. The thickness of each magnetic rib layer is h1, h2, h3, and h4, respectively, satisfying 0.23≤h1 / hp≤0.26, 0.23≤h2 / hp≤0.26, 0.23≤h3 / hp≤0.26, and 0.23≤h4 / hp≤0.26.

[0062] Exemplarily, each rotor core is a rotor core with a U-shaped magnetic barrier structure. The reason why the rotor core is a U-shaped magnetic barrier structure is that the rotor structure determines the d-axis and q-axis magnetic flux paths, directly affecting the magnetic resistance torque and power factor of the motor. The U-shaped magnetic barrier structure can increase the speed of the above-mentioned power generation device and increase the power density of the above-mentioned power generation device. Each rotor core is a rotor core with multiple magnetic conductive punching sheets stacked, which can increase the magnetic flux of the inductor coil and realize a large conversion of electromagnetic force.

[0063] Exemplarily, the rotor protection cover is a carbon fiber rotor protection cover, which is made of high-strength carbon fiber material and is interference-fitted onto the outer side of the rotor core, thereby increasing the structural strength of the rotor.

[0064] Exemplarily, the interval angle between two adjacent stator windings is 30° electrical angle.

[0065] In practical applications, the distributed magnetic bridge permanent magnet assisted synchronous reluctance starting generator adopts a 4-pole 24-slot structure, the winding form is a double three-phase winding, the pole pitch is 6, and the interval angle between two adjacent stator windings is 30° electrical angle. And the stator slot is a parallel tooth structure.

[0066] Specifically, the AC motor winding factor K of the distributed magnetic bridge permanent magnet assisted synchronous reluctance starting generator is wv and the skew factor k skv It can be expressed as:

[0067]

[0068] Among them, the stator winding 12 short-distance coefficient y1 / τ=5 / 6, the skew slot is 30°, and the skew slot coefficient c / τ=2 / 6, which can reduce the winding coefficient of the 5th and 7th harmonics to kw5 ×k sk5 =0.05, k w7 ×k sk7 =0.035, which can reduce the 5th and 7th harmonic contents and improve the operating performance of the distributed magnetic bridge permanent magnet assisted synchronous reluctance starting generator.

[0069] Figure 3 is a schematic diagram further illustrating the magnetic flux distribution of a conventional distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to an embodiment of the present disclosure, Figure 4 is a schematic diagram further illustrating the magnetic flux distribution of a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to an embodiment of the present disclosure, such as Figure 3 - Figure 4 As shown, compared with the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator, the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator has a higher degree of magnetic circuit saturation in the inner magnetic bridge part, a larger d-axis reluctance, a higher motor salient pole ratio, a larger electromagnetic power corresponding to the reluctance torque part, and a higher motor power density.

[0070] Figure 5 is a schematic diagram further illustrating the rotor stress distribution of a conventional distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to an embodiment of the present disclosure, Figure 6 is a schematic diagram further illustrating the rotor stress distribution of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to an embodiment of the present disclosure, such as Figure 5 - Figure 6 As shown, compared with the traditional distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator, the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator has a smaller maximum stress value of the rotor structure and higher mechanical strength. By reducing the width of the inner magnetic bridge, the power density of the starter generator can be further improved.

[0071] Figure 7 is a schematic diagram further illustrating the waveform distribution of the back electromotive force of the no-load line of the conventional distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to an embodiment of the present disclosure, Figure 8 is a further diagram illustrating a waveform distribution diagram of the back electromotive force of the no-load line of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to an embodiment of the present disclosure, such as Figure 7 - Figure 8 As shown in the figure, compared with the traditional distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator, the no-load line back electromotive force wave of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator is closer to a sine wave, and the 5th and 7th harmonic components account for a smaller proportion.

[0072] Fig. 9is a schematic diagram further illustrating the distribution of different parameters of a conventional distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating device and a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating device according to an embodiment of the present disclosure, such as Fig. 9 As shown, 10 represents a conventional distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator, 20 represents a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator, and compared with the conventional distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator, the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator proposed in the present invention has a larger salient pole ratio, a higher power density, and a higher mechanical strength, and the overall performance of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator is better.

[0073] In an optional manner, a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating system is provided, including a distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating device as provided in one aspect of the present disclosure.

[0074] Compared with the prior art, the beneficial effects of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating system provided by the present invention are the same as the beneficial effects of the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating device provided by the present invention, which will not be repeated here.

[0075] The above descriptions are only some embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, a technical solution formed by replacing the above features with the technical features with similar functions disclosed in the present disclosure (but not limited to).

[0076] Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator, characterized in that: include: A stator assembly, a rotor assembly, a rotating shaft, a housing and an end cover, wherein the rotor assembly is sleeved on the rotating shaft, the stator assembly is sleeved on the rotor assembly and is rotatably connected to the rotor assembly, and the end cover is connected to the housing, and the stator assembly, the rotor assembly and the rotating shaft are encapsulated in the housing through the housing and the end cover to form the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator; The rotor assembly comprises: a rotor, a plurality of rotor cores, a plurality of permanent magnets and a rotor protective cover, the rotor is provided with a through hole for inserting each of the rotor cores, each of the permanent magnets is arranged in each of the rotor cores, the rotor protective cover is sleeved on the outer side wall of the rotor, the thickness of the permanent magnets along the radial direction close to the stator assembly decreases successively, and each of the permanent magnets is used to adjust the dual three-phase short-circuit current; The stator assembly includes: a stator, a plurality of stator cores and a plurality of stator windings. The stator is sleeved on the rotor. There is a gap between the stator and the rotor. The stator is a 4-pole 24-slot structure. Each stator core is correspondingly arranged in the 4-pole 24-slot structure of the stator. Each of the stator windings is distributed along the circumferential direction of the stator and each of the stator windings is a double three-phase winding.

2. The distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to claim 1, characterized in that: Each of the rotor cores includes: horizontal magnetic barriers, inclined magnetic barriers, inner magnetic bridges, outer magnetic bridges and rotor magnetic ribs. The outer magnetic bridge is located between the outer circle of the rotor and the inclined magnetic barriers, the inner magnetic bridge is located between the horizontal magnetic barriers, the inner magnetic bridge is used to divide the horizontal magnetic barriers into multiple sections, the rotor magnetic ribs are located at the position of the horizontal magnetic barriers, and the outer magnetic bridge is used to connect the rotor magnetic ribs.

3. The distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to claim 1, characterized in that: Each of the rotor cores is a rotor core with a U-shaped magnetic barrier structure.

4. The distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to claim 3, characterized in that: Each of the rotor cores is a rotor core formed by stacking a plurality of magnetically conductive stamping sheets.

5. The distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to any one of claims 1 to 4, characterized in that: The rotor assembly also includes two reference directions, namely, a d-axis and a q-axis. Under one pole, the d-axis is located on a symmetric center line under one pole, and the q-axis is located on a symmetric center line between two adjacent poles.

6. The distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to claim 5, characterized in that: Under one pole, a first layer of magnetic barriers, a second layer of magnetic barriers and a third layer of magnetic barriers are arranged in sequence along the direction of the d-axis, the radial size of the first layer of magnetic barriers is larger than the radial size of the second layer of magnetic barriers, and the radial size of the second layer of magnetic barriers is larger than the radial size of the third layer of magnetic barriers.

7. The distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to claim 1, characterized in that: The rotor protection cover is a carbon fiber rotor protection cover.

8. The distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to claim 1, characterized in that: The interval angle between two adjacent stator windings is 30° electrical angle.

9. The distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting generator according to claim 1, characterized in that: The 4-pole 24-slot structure of the stator is a parallel tooth structure.

10. A distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating system, comprising the distributed magnetic bridge type permanent magnet assisted synchronous reluctance starting and generating device according to any one of claims 1 to 9.

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