Surface-mounted high-speed permanent magnet synchronous rotor

Abstract

The application discloses a surface-mounted high-speed permanent magnet synchronous rotor, which comprises a rotor shaft (1), a plurality of groups of permanent magnets (2), a plurality of groups of silicon steel sheets (3) and a rotor core sheath (4), the plurality of groups of permanent magnets (2) and the plurality of groups of silicon steel sheets (3) are respectively adhered to the surface of the rotor shaft (1) along the axial direction of the rotor shaft (1), the permanent magnets (2) and the silicon steel sheets (3) are distributed in the ring direction of the rotor shaft (1), the outer diameters of the permanent magnets (2) and the silicon steel sheets (3) are the same, and the rotor core sheath (4) is sleeved on the outer periphery of the permanent magnets (2) and the silicon steel sheets (3). The surface-mounted high-speed permanent magnet synchronous rotor can meet the requirements of high rotating speed and wide constant power range, and stress concentration does not exist in the rotor core sheath.

Description

Technical Field

[0001] This invention relates to the field of high-speed permanent magnet motor / generator technology, and in particular to a surface-mounted high-speed permanent magnet synchronous rotor. Background Technology

[0002] High-speed permanent magnet motors have become an important development direction for high-speed motors due to their advantages such as high power density, small size and high efficiency, and have become a research hotspot in the field of high-speed motors both at home and abroad.

[0003] Motors / generators used in drive systems for new energy vehicles, experimental platforms, and rail transit must simultaneously meet the requirements of high speed and a wide constant power range. High speed is generally defined as a rotor core linear velocity greater than 100 m / s. A wide constant power range means that the power of the motor / generator remains constant between the rated speed and the maximum speed. This type of motor / generator typically has a wide speed variation range, with its maximum speed usually being more than three times the rated speed, and is mainly used in gearless drive systems.

[0004] In existing technologies, the built-in permanent magnet synchronous motor / generator, which is widely used in the drive system of new energy vehicles, can meet the requirements of a wide range of constant power, but it cannot meet the requirements of high speed due to the low yield strength of its silicon steel sheet material.

[0005] Surface-mounted high-speed permanent magnet motors / generators can meet high-speed requirements due to their high-strength non-magnetic alloy / composite material sheaths that resist the centrifugal force of the permanent magnets.

[0006] Currently, there are two main types of surface-mounted high-speed permanent magnet motor rotors:

[0007] The first type is as follows Figure 1 As shown, the rotor consists of a rotor shaft 1 without reinforcing ribs, a permanent magnet 2, and a rotor core sleeve 4. The advantages of this type of rotor are that the rotor shaft 1 and the permanent magnet 2 deform uniformly under the action of preload, rotational load, and thermal expansion load, and there is no stress concentration in the rotor core sleeve 4. The disadvantage is that there is only permanent magnet torque and no reluctance torque, which results in a small weak magnetic region, that is, it cannot meet the requirement of a wide constant power range.

[0008] The second type is as follows Figure 2 As shown, the rotor consists of a rotor shaft 1 with reinforcing ribs, a permanent magnet 2, and a rotor core sleeve 4. The advantages of this rotor are that the reinforcing ribs of the rotor shaft 1 can improve the rotor's bending stiffness, critical speed, and reduce the rotor length. At the same time, the reinforcing ribs of the rotor shaft 1 can generate reluctance torque, thus meeting the requirement of a wide range of constant power. The disadvantages are that the reinforcing ribs of the rotor shaft 1 and the permanent magnet 2 have different elastic moduli and thermal expansion coefficients, resulting in uneven deformation under preload, rotational load, and thermal expansion load. The rotor core sleeve 4 has severe stress concentration and does not meet the strength requirements.

[0009] Therefore, developing a surface-mounted high-speed permanent magnet motor rotor that can simultaneously meet the requirements of high speed, wide constant power range and no stress concentration of the rotor core sheath is an urgent problem for those skilled in the art. SUMMARY

[0010] The application aims to provide a surface-mounted high-speed permanent magnet synchronous rotor that can simultaneously meet the requirements of high speed, wide constant power range and no stress concentration of the rotor core sheath.

[0011] To solve the above technical problems, the application provides the following technical scheme:

[0012] A surface-mounted high-speed permanent magnet synchronous rotor comprises a rotor shaft, a plurality of groups of permanent magnets, a plurality of groups of silicon steel sheets and a rotor core sheath, the plurality of groups of permanent magnets and the plurality of groups of silicon steel sheets are adhered to the surface of the rotor shaft along the axial direction of the rotor shaft, the permanent magnets and the silicon steel sheets are distributed in the circumferential direction of the rotor shaft, the outer diameters of the permanent magnets and the silicon steel sheets are the same, and the rotor core sheath is sleeved on the outer periphery of the permanent magnets and the silicon steel sheets.

[0013] Preferably, the rotor core sheath is a metal sleeve, and the permanent magnets and the silicon steel sheets are assembled with the metal sleeve through interference.

[0014] Preferably, the rotor core sheath is a composite material sheath that is wound on the permanent magnets and the silicon steel sheets through the pre-tightening force of composite material wires.

[0015] Preferably, the material of the composite material sheath is a mixed material of resin and reinforcing fiber.

[0016] Preferably, the resin is epoxy resin, phenolic resin, polytetrafluoroethylene, polyimide, bismaleimide, cyanate ester, benzoxazine or cyan resin, and the reinforcing fiber is carbon fiber, Kevlar or glass fiber.

[0017] Preferably, the adhering surface of the permanent magnets and the silicon steel sheets to the rotor shaft is a plane or an arc-shaped curved surface.

[0018] Preferably, the number of groups of silicon steel sheets is 2n, and n is a natural number.

[0019] The surface-mounted high-speed permanent magnet synchronous rotor provided by this invention includes a rotor shaft, several sets of permanent magnets, several sets of silicon steel sheets, and a rotor core sleeve. Each set of permanent magnets contains several permanent magnet blocks, which are sequentially connected end-to-end along the axial direction of the rotor shaft. Each set of silicon steel sheets 3 comprises multiple silicon steel sheet bodies, which are sequentially stacked along the axial direction of the rotor shaft. The rotor shaft is an optical shaft. The several sets of permanent magnets and several sets of silicon steel sheets are bonded to the surface of the rotor shaft 1 along the axial direction of the rotor shaft, with the axial direction of each set of permanent magnets and each set of silicon steel sheets being the same as the axial direction of the rotor shaft. The permanent magnets and silicon steel sheets are spaced apart in the circumferential direction of the rotor shaft, with the two sides of the permanent magnets contacting the two sides of the silicon steel sheets. The outer diameters of the permanent magnets and silicon steel sheets are the same. The rotor core sleeve is fitted around the outer periphery of the permanent magnets and silicon steel sheets, housing them within the sleeve, and the rotor core sleeve meets the high-speed requirements.

[0020] Applying the technical solution provided in this invention, the high-speed permanent magnet synchronous rotor adopts a surface-mounted structure with added silicon steel sheets. The permeability of the silicon steel sheets is greater than that of the rotor shaft, and the silicon steel sheets on the rotor shaft can generate reluctance torque. Since the silicon steel sheets are non-rigidly connected to the rotor shaft, the deformation is uniform under preload, rotational load, and thermal expansion load, and there is no stress concentration in the rotor core sheath. In summary, the surface-mounted high-speed permanent magnet synchronous rotor proposed in this invention can simultaneously meet the requirements of high speed, small field weakening region, and wide constant power range, which is of great significance for the design of high-speed permanent magnet motor rotors in drive systems for new energy vehicles, experimental platforms, and rail transit. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic cross-sectional view of the first typical surface-mounted high-speed permanent magnet synchronous rotor core in the prior art.

[0023] Figure 2 This is a schematic cross-sectional view of the second typical surface-mounted high-speed permanent magnet synchronous rotor core in the prior art;

[0024] Figure 3 A schematic diagram of a surface-mounted high-speed permanent magnet synchronous rotor provided in a specific embodiment of the present invention;

[0025] Figure 4 for Figure 3 A schematic diagram of the cross-section of the C-section;

[0026] Figure 5 The exploded view of the surface-mounted high-speed permanent magnet synchronous rotor.

[0027] The figures are marked as follows:

[0028] Rotor shaft 1, permanent magnet 2, silicon steel sheet 3, rotor core sheath 4. DETAILED DESCRIPTION

[0029] The core of the present application is to provide a surface-mounted high-speed permanent magnet synchronous rotor which can meet the requirements of high speed and wide power range and has no stress concentration in the rotor core sheath.

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0031] Please refer to Figures 3 to 5 , Figure 3 The structural schematic diagram of the surface-mounted high-speed permanent magnet synchronous rotor provided in one specific embodiment of the present application; Figure 4 The structural schematic diagram of the surface-mounted high-speed permanent magnet synchronous rotor provided in one specific embodiment of the present application; Figure 3 The structural schematic diagram of the surface-mounted high-speed permanent magnet synchronous rotor provided in one specific embodiment of the present application; Figure 5 The exploded view of the surface-mounted high-speed permanent magnet synchronous rotor.

[0032] In one specific embodiment, the surface-mounted high-speed permanent magnet synchronous rotor provided by the present application comprises a rotor shaft 1, a plurality of groups of permanent magnets 2, a plurality of groups of silicon steel sheets 3 and a rotor core sheath 4. The plurality of groups of permanent magnets 2 and the plurality of groups of silicon steel sheets 3 are respectively adhered to the surface of the rotor shaft 1 along the axial direction of the rotor shaft 1. The permanent magnets 2 and the silicon steel sheets 3 are distributed at intervals in the circumferential direction of the rotor shaft 1. The outer diameter of the permanent magnet 2 is the same as that of the silicon steel sheet 3. The rotor core sheath 4 is sleeved on the outer periphery of the permanent magnet 2 and the silicon steel sheet 3.

[0033] In the above structure, the surface-mounted high-speed permanent magnet synchronous rotor comprises a rotor shaft 1, a plurality of groups of permanent magnets 2, a plurality of groups of silicon steel sheets 3 and a rotor core sheath 4. The size and strength parameters of the rotor shaft 1, the permanent magnet 2, the silicon steel sheet 3 and the rotor core sheath 4 meet the use requirements of the high-speed permanent magnet motor / generator.

[0034] Each group of permanent magnets 2 comprises a plurality of permanent magnet blocks. The plurality of permanent magnet blocks are sequentially connected in a head-to-tail manner in the axial direction of the rotor shaft 1. Each group of silicon steel sheets 3 comprises a plurality of silicon steel sheets 3. The plurality of silicon steel sheets 3 are sequentially laminated in the axial direction of the rotor shaft 1.

[0035] The rotor shaft 1 is an optical axis, and a plurality of groups of permanent magnets 2 and a plurality of groups of silicon steel sheets 3 are pasted to the surface of the rotor shaft 1 in the axial direction of the rotor shaft 1. The axial direction of each group of permanent magnets 2 and each group of silicon steel sheets 3 is the same as the axial direction of the rotor shaft 1.

[0036] Preferably, the permanent magnets 2 and the silicon steel sheets 3 are pasted to the surface of the rotor shaft 1 by glue, which is convenient to connect and easy to operate, and the pasting is firm and not easy to loosen. Further, the side surface of the permanent magnet 2 and the side surface of the silicon steel sheet 3 are connected by glue, and the side surface of the permanent magnet 2 and the side surface of the silicon steel sheet 3 are pasted together, so that the rotor shaft 1, the silicon steel sheet 3 and the permanent magnet 2 are bonded as a whole, further enhancing the connection strength of the whole. When the silicon steel sheet 3 or the permanent magnet 2 is separated from the rotor shaft 1, the separated silicon steel sheet 3 or permanent magnet 2 is still connected to the adjacent permanent magnet 2 or silicon steel sheet 3, and the silicon steel sheet 3 and the permanent magnet 2 will not be separated from the rotor shaft 1.

[0037] The permanent magnets 2 and the silicon steel sheets 3 are spaced apart in the circumferential direction of the rotor shaft 1, that is, there is a gap between the permanent magnets 2 and the silicon steel sheets 3, the silicon steel sheets 3 are arranged in the gap, and the permanent magnets 2 and the silicon steel sheets 3 are arranged in sequence and spaced apart. The two side surfaces of the permanent magnet 2 are in contact with the two side surfaces of the silicon steel sheet 3.

[0038] When the permanent magnets 2 and the silicon steel sheets 3 are pasted to the surface of the rotor shaft 1, the two end faces of the permanent magnets 2 and the silicon steel sheets 3 are pressed by the end plates at both ends of the rotor core after assembly, so as to fix the permanent magnets 2 and the silicon steel sheets 3. Preferably, the end plate is a steel plate, which has high strength and low cost.

[0039] The permanent magnets 2 and the silicon steel sheets 3 have the same outer diameter, and the rotor core sheath 4 is sleeved on the outer periphery of the permanent magnets 2 and the silicon steel sheets 3. The rotor core sheath 4 sleeves the permanent magnets 2 and the silicon steel sheets 3 therein, and the rotor core sheath 4 meets the high speed requirement. Preferably, after the installation of the permanent magnets 2 and the silicon steel sheets 3 is completed, the permanent magnets 2 and the silicon steel sheets 3 are machined, the outer wall of the installed permanent magnets 2 and the silicon steel sheets 3 is cut, the outer diameters of the permanent magnets 2 and the silicon steel sheets 3 are equalized, the influence of machining error and installation error is eliminated, the deformation under the action of pre-tightening force, rotating load and thermal expansion load is uniform, and stress concentration does not exist in the rotor core sheath 4.

[0040] By using the technical solution provided by the embodiment of the application, the surface-mounted structure is adopted for the high-speed permanent magnet synchronous rotor, the silicon steel sheet 3 is added, the magnetic permeability of the silicon steel sheet 3 is greater than that of the rotor shaft 1, and the silicon steel sheet 3 on the rotor shaft 1 can form a magnetic resistance torque; the silicon steel sheet 3 is non-rigidly connected with the rotor shaft 1, and thus is uniformly deformed under the action of the pre-tightening force, the rotating load and the thermal expansion load, and the rotor core sheath 4 does not have stress concentration. In summary, the surface-mounted high-speed permanent magnet synchronous rotor provided by the application can meet the requirements of high speed, small field-weakening region and wide constant power range, and has important significance for the design of the high-speed permanent magnet motor rotor of the driving system of a new energy vehicle, an experimental table and track transportation.

[0041] The rotor core sheath 4 includes at least two schemes, the first rotor core sheath 4 is a metal sheath, for example, a non-magnetic alloy sheath, which can be a titanium alloy, a nickel-chromium alloy, has high strength and corrosion resistance, and meets the performance requirements of the surface-mounted high-speed permanent magnet synchronous rotor. The permanent magnet 2 and the silicon steel sheet 3 are in interference fit with the metal sheath, and are assembled with the metal sheath in a hot fit manner, and have high connection strength.

[0042] The second rotor core sheath 4 is a composite material sheath, and the composite material sheath winds the single yarn / prepreg on the outer circle of the permanent magnet 2 and the silicon steel sheet 3 through the pre-tightening force, and is convenient to connect.

[0043] The composite material sheath is composed of a resin and a reinforcing fiber, and the resin can be epoxy resin, phenolic resin, polytetrafluoroethylene, polyimide, bismaleimide, cyanate ester, benzoxazine, and cyan resin, and the reinforcing fiber can be carbon fiber, Kevlar or glass fiber. The resin and the reinforcing fiber can be combined in any manner, and the specific combination manner is various, and all falls within the protection scope of the application.

[0044] Further optimization of the above technical solution, the person skilled in the art can make several changes to the above specific embodiments according to different specific occasions, the bonding surface of the permanent magnet 2 and the silicon steel sheet 3 with the rotor shaft 1 can be a plane or an arc-shaped curved surface, so as to meet different electromagnetic properties and have a wide range of applications.

[0045] On the basis of the above specific embodiments, the number of the silicon steel sheets 3 is 2n, n is a natural number, is uniformly distributed, and is arranged in an axial symmetry, so as to ensure the uniform rotation of the high-speed permanent magnet motor, the consistency of the energy in the circumferential direction and the dynamic balance. It should be noted that the circumferential proportion of the permanent magnet 2 is greater than that of the silicon steel sheet 3, for example, three groups of permanent magnets 2 are arranged, and one group of silicon steel sheets 3 is arranged, so as to meet the performance and use requirements of the surface-mounted high-speed permanent magnet synchronous rotor. The number and proportion of the permanent magnets 2 and the silicon steel sheets 3 are not limited, and can be determined according to the actual application.

[0046] Various embodiments are described herein with reference to a sequence of actions to be taken by, for example, elements of a computing device. In some embodiments, the various embodiments can be implemented in hardware, software, or a combination thereof. The various embodiments are described herein with reference to specific language making use of a particular sequence of actions. Those of ordinary skill in the art will recognize that the last sequences described are illustrative only and are not meant to limit the scope of the various embodiments. Any combination of the actions described can be employed without departing from the scope of the various embodiments.

[0047] The surface-mounted high-speed permanent magnet synchronous rotor provided by the application is described in detail above. The principles and implementation manners of the application are described by applying specific examples in this paper, and the above description of the embodiments is only used to help understand the method of the application and its core idea. It should be pointed out that, for those skilled in the art, some improvements and modifications can be made to the application without departing from the principles of the application, and these improvements and modifications also fall within the protection scope of the claims of the application. Therefore, the application will not be limited to the embodiments shown in this paper, but will be consistent with the widest scope of the principles and novel features disclosed in this paper.

Claims

1. A surface-mounted high-speed permanent magnet synchronous rotor, characterized by, The rotor core sleeve (4) is a metal sleeve, and the permanent magnet (2) and the silicon steel sheet (3) are assembled with the metal sleeve through interference.

2. The surface-mounted high-speed permanent magnet synchronous rotor according to claim 1, characterized in that, The rotor core sleeve (4) is a composite material sleeve which is wound on the permanent magnet (2) and the silicon steel sheet (3) through composite material wire pre-tightening force.

3. The surface-mounted high-speed permanent magnet synchronous rotor of claim 1, wherein, The material of the composite material sleeve is a mixed material of resin and reinforcing fiber.

4. The surface-mounted high-speed permanent magnet synchronous rotor of claim 3, characterized in that, The resin is epoxy resin, phenolic resin, polytetrafluoroethylene, polyimide, bismaleimide, cyanate ester, benzoxazine or cyan resin, and the reinforcing fiber is carbon fiber, Kevlar or glass fiber.

5. The surface-mounted high-speed permanent magnet synchronous rotor of claim 4, characterized in that, The fitting surface of the permanent magnet (2) and the silicon steel sheet (3) with the rotor shaft (1) is a plane or an arc-shaped curved surface.

6. The surface-mounted high-speed permanent magnet synchronous rotor of any one of claims 1-5, characterized in that, The number of groups of the silicon steel sheet (3) is 2n, and n is a natural number.

7. The surface-mounted high-speed permanent magnet synchronous rotor of any one of claims 1-5, characterized in that, ​

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